CN104468027A - Base station device supporting data transmission based on high-order modulation and data communication method - Google Patents

Base station device supporting data transmission based on high-order modulation and data communication method Download PDF

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Publication number
CN104468027A
CN104468027A CN201310441200.6A CN201310441200A CN104468027A CN 104468027 A CN104468027 A CN 104468027A CN 201310441200 A CN201310441200 A CN 201310441200A CN 104468027 A CN104468027 A CN 104468027A
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China
Prior art keywords
cqi
mapping form
offset
mapping
information
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Chinese (zh)
Inventor
郑萌
耿璐
水谷美加
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Hitachi Ltd
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Hitachi Ltd
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Priority to CN201310441200.6A priority Critical patent/CN104468027A/en
Priority to PCT/CN2014/079485 priority patent/WO2015043233A1/en
Publication of CN104468027A publication Critical patent/CN104468027A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—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
    • 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
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046—Determination of how many bits are transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK

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

Abstract

The invention discloses a base station device and a data communication method. The base station device comprises a receiving unit, a high-layer link unit, an information collecting unit, a scheduling unit and a sending unit, wherein the receiving unit receives channel state information comprising a CQI index from a terminal device, the high-layer link unit generates a high-layer signaling sending signal and sends the high-layer signaling sending signal to the terminal device, whether the terminal device uses a basic CQI mapping table or extension CQI mapping table is determined in the high-layer signaling sending signal, the extension CQI mapping table stipulates the correspondence relationship between the CQI index, an extension modulation mode and the code rate, and the extension modulation mode comprises a high-order modulation mode with a higher modulation order; the information collecting unit maps the CQI index to signal-interference and noise ratio information according to the specific CQI mapping table; the scheduling unit distributes channel resources of the terminal device according to the mapped signal-interference and noise ratio information and selects a modulation encoding scheme; the sending unit generates a downlink transmission signal according to the scheduling result and sends the downlink transmission signal to the terminal device.

Description

Support the base station apparatus based on the transfer of data of high order modulation and data communications method
Technical field
The present invention relates to base station as Wireless Telecom Equipment to the method for terminal transmission data, base station apparatus and terminal installation.In particular to can by the configuration of downlink signaling flexibly, the support utilizing efficient Modulation and Coding Scheme to carry out downlink data transmission be based on the base station apparatus of the transfer of data of high order modulation and data communications method.
Background technology
Link adaptation techniques refers to that information sender obtains the current channel quality information of channel by certain mode, and be that recipient selects suitable Modulation and Coding Scheme (Modulation andCoding Scheme based on this information, MCS), chnnel coding, modulation and transmission are carried out for the information sent, to make full use of the process that channel capacity realizes higher data transmission rate.In the wireless network, coded system, code check and modulation system that base station and terminal (UE) may use system are arranged in advance, actual carry out transfer of data time, determine MCS based on the specifying information comprised in signaling and select suitable codec and modulator-demodulator, data-signal sent and receives.If indication information makes a mistake or transmit leg to employ not be the Modulation and Coding Scheme that recipient supports, then can cause taking defeat of information.
At long evolving system (the Long Term Evolution that 3GPP organizes to set up, LTE) in standard, system is when carrying out downlink data transmission, convolution code or Turbo code can be selected in base station, and through-rate matching technique realizes multiple possible code check, produces the bit stream after chnnel coding; QPSK can be selected in base station afterwards, 16QAM or 64QAM modulates for code bit stream, after producing concrete modulation symbol, through process such as follow-up multiple antennas, is sent by signal by antenna.Terminal, then according to the down physical layer control signal information that base station sends, is selected corresponding demodulation code device, is attempted receiving for data.
The information carrying capacity of different modulating mode is different.A QPSK symbol can only carry 2 bits, and a 64QAM symbol can carry 6 bits.Because a same modulation symbol occupies an identical resource element (Resource Element, RE) on resource lattice, therefore under identical encoder bit rate prerequisite, the data transmission rate of the latter is the former 3 times.And meanwhile, the latter for interference and the susceptibility of noise far above the former, this means interference or noise stronger time, the reception of 64QAM modulation symbol there will be a large amount of mistakes, and therefore offsets the benefit that higher symbols carry rate brings.Thus, only under the channel capacity that higher signal to noise ratio is namely higher, use 64QAM to carry out transfer of data and just can bring benefit.3GPP, by the mode of feedback, is reported the channel quality information of the quantification being called as channel quality instruction (Channel Quality Indicator, CQI) to base station by terminal.Base station based on this information, the MCS that uses during determination data transmission.And when channel quality is enough good, the symbol that LTE base station can use 64QAM to modulate transmits.Together with the highest code check that the Turbo code rate-matched that this modulation system and LTE system are supported can reach, determine the upper limit of LTE system downlink transmission rate.Under typical macrocell covering scene, reached at the Signal to Interference plus Noise Ratio value of LTE system is limited, and therefore in prior art, the MCS based on the modulation system to 64QAM can utilize channel capacity more fully.
High order modulation is not limited to 64QAM certainly, such as, also there is 256QAM, and when the number of constellation points of modulation system brings up to 256 from 64, the bit number of a 256QAM symbols carry mentions 8 from 6, thus makes data transmission rate further increase 33%.But because 256QAM is more responsive to interference, be suitable for the environment that signal to noise ratio is higher, under the current cellular network environment that therefore still can not reliably cover at 64QAM, 256QAM almost only exists theoretic application may.
On the other hand, as the effort of wireless network environment improvement aspect, in LTE Rel.12, introduce the research that Microcell is strengthened.So-called Microcell, refers to signal transmission power much smaller than macrocell, the community that the base station equipment being generally used for covering among a small circle or focus strengthens creates.Microcell may be laid in macrocell and cover inaccessible region as Fig. 1 (a), or work and in macrocell independently frequency range as Fig. 1 (b).In scene (a) in this example, the signal that 101 macro base stations 1 send, owing to experienced by larger decline and the stop of building walls, can not arrive 103 terminal 1(signal strength signal intensities much smaller than noise).Meanwhile, 102 micro-base stations 1 use the carrier frequency 104 identical with macro base station 1 to cover for interior of building.Now terminal 1 is very near apart from micro-base station 1, and can not be subject to the co-channel interference coming from adjacent cell, can obtain the Signal to Interference plus Noise Ratio be better than under traditional macrocell scene.In the scene of Fig. 1 (b) example, the 101 micro-base stations 2 of macro base station 1 and 102 work in different carrier frequency 104(f1) and 105 (f2).103 terminals 1 being positioned at Microcell can access the carrier frequency of micro-base station 2, simultaneously from the signal of macro base station 1 by filtering.Terminal 1 can also receive the signal of other micro-base station as the same carrier of micro-base station 1, if but distant, its attenuation degree is serious compared with the useful signal of Serving cell, then terminal 1 can obtain the Signal to Interference plus Noise Ratio be better than under traditional macrocell scene equally.Higher Signal to Interference plus Noise Ratio means higher up channel capacity.Now in LTE system, existing MCS only to 64QAM likely can limit the utilization for channel capacity, therefore the modulation system introducing the higher such as 256QAM of efficiency even more high-order effectively can promote the efficiency of transmission of terminal 1, thus brings the Integral lifting of systematic function.
Meanwhile, LTE introduces various interference mitigation technology in existing version, as between enhancement type district, interference is cancelled or multipoint cooperative technology.These technology can reduce the interference coming from adjacent cell usually, even strengthen the intensity of useful signal, thus obtain the Signal to Interference plus Noise Ratio be better than under traditional macrocell scene.Therefore the modulation system introducing the higher such as 256QAM of efficiency may promote the efficiency of transmission of the target terminal benefited from existing interference mitigation technology equally, thus brings the Integral lifting of systematic function.
In order to introduce new modulation system, need to define new MCS combination, these new combinations need supported by base station and terminal simultaneously and be recorded in MCS information form.Simultaneously in order to ensure backwards compatibility, still need to retain original MCS form in systems in which.So need to define many group MCS forms in new system, and the relevant feedback of definition, scheduling process are supported.
At patent documentation 1(US2009010211A1) in, define the base station-terminal system that can be supported many group MCS forms.Often organizing in different MCS forms, the thresholding that same MCS scheme is corresponding different.Patent documentation 1 for technical problem be that the CQI of terminal reports and usually there is error in systems in practice.For compensating this error as far as possible, all terminals are referred in different levels by the base station of patent documentation 1 goes, and then adopts different MCS forms to the UE of different levels.Such as the CQI of the terminal to report of level 1 is greater than the SINR value of its reality, if use the MCS form of corresponding accurately thresholding to carry out mapping, can cause higher error rate.Therefore a base station selected MCS form, has the skew that positive, in this form, namely only has higher Signal to Interference plus Noise Ratio value relatively just can be mapped to this MCS between the mapping thresholding of each MCS and its accurate thresholding in this form.By configuring different mapping thresholdings in different forms same MCS, terminal can be classified and be used different MCS forms by base station, thus obtains more accurate mapping result, compensates the CQI evaluated error of terminal, with elevator system performance.
But this base station of patent documentation 1 is the method for MCS form that different terminals is selected to be applicable to, and its object is not intended to utilize channel capacity to reach higher transmission rate further, but the adverse effect brought in order to the channel estimation bias processing UE.Employ the combination of identical Modulation and Coding Scheme between different MCS forms, difference is only the scope of the Signal to Interference plus Noise Ratio mapped.Base station can utilize the method effectively to follow the tracks of the change of channel quality, but can not support the MCS scheme of expansion.
At patent documentation 2(WO2012119549A1) in, describe the relation between the MCS form of new support 256QAM and downlink transfer block size (Transport Block Size, TBS) and give multiple embodiments.On this basis, give how from the MCS-TBS mapped extension of single layer transmission to MCS-TBS mapping relations during multilayer transmission.But just give in the document and support the MCS form of 256QAM, and be not given in LTE system the mechanism such as the concrete structure of supporting new MCS form and method.
Summary of the invention
The present invention proposes in view of the above problems, its object is to provide a kind of comprise the basic CQI mapping form of existing modulation system by arranging and comprise this two-layer CQI mapping form of expansion CQI mapping form of the high-order modulating such as 256QAM, carry out between selecting thus promoting CSI feedback accuracy, assist the MCS scheme dynamically determining downlink transfer, channel capacity is made full use of with the modulation system by realizing the more high-order such as 256QAM, and the communication means in the base station apparatus of the favorable compatibility between current mechanism and wireless communication system can also be kept.
According to an aspect of the present invention, a kind of base station apparatus is provided, in a wireless communication system and between terminal installation, utilize the feedback information produced based on CQI form, determine Modulation and Coding Scheme, data-signal is sent and receives, it is characterized in that, comprising: receiving element, receive the channel condition information comprising the CQI index representing channel quality from described terminal installation, high-rise linking element, produce high-level signaling send signal and send to terminal installation, the channel condition information that this high-rise linking element receives according to described receiving element, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in described basic CQI mapping form, information collection unit, CQI index-mapping is Signal to Interference plus Noise Ratio information by the basic CQI mapping form for terminal installation specified by described high-rise linking element or expansion CQI mapping form, scheduling unit, according to the Signal to Interference plus Noise Ratio information that described information collection unit maps, carries out channel resource allocation to terminal installation and selects Modulation and Coding Scheme, and transmitting element, according to resource allocation result and the Modulation and Coding Scheme selection result of described scheduling unit, generate downstream transmission signals and send to described terminal installation.
Thus, the present invention comprises the basic CQI mapping form of existing modulation system by arranging and comprises this two-layer CQI mapping form of expansion CQI mapping form of the high-order modulating such as 256QAM, carry out between selecting thus promoting CSI feedback accuracy, assist the MCS scheme dynamically determining downlink transfer, while the modulation system by realizing the more high-order such as 256QAM makes full use of channel capacity, the favorable compatibility between current mechanism can also be kept.
In addition, also can be, in above-mentioned base station apparatus, described terminal installation is configured at least one CSI feedback object, and described CSI feedback is to liking terminal installation different channels state information reference signals CSI-RS in a network environment and the combination of channel condition information interferometry CSI-IM resource; Described high-rise linking element, for each CSI feedback object of described terminal installation, specifies the CQI form used to be basic CQI mapping form or expansion CQI mapping form; CQI index-mapping is Signal to Interference plus Noise Ratio information for each CSI feedback object of terminal installation by described information collection unit; Described scheduling unit, based on signal source and the disturbance regime of terminal installation, determine corresponding CSI feedback object, according to the Signal to Interference plus Noise Ratio information that described information collection unit maps for the corresponding CSI feedback object of terminal installation, channel resource allocation is carried out to terminal installation and selects Modulation and Coding Scheme.
The present invention is not only for terminal, and be to specify basic CQI mapping form or expansion CQI mapping form for the CSI feedback object of terminal, CSI feedback object corresponds to the different channels state/interference scenario of terminal under real network environment, thus, the specific CSI feedback object of designated terminal can use specific CQI mapping form, to realize for the more accurate MCS arrangements of terminal under real network environment.
In addition, also can be, in above-mentioned base station apparatus, the CSI feedback object of terminal installation is current use basic CQI mapping form time, when described high-rise linking element judges that current downlink transmission block is dispatched based on CQI value whether equal in basic CQI mapping form CQI maximum, and whether the transfer rate of the MCS used during this downlink transfer Bulk transport is more than or equal to the transfer rate corresponding to CQI maximum of basic CQI mapping form, if these two results judged are and are, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation.
If during the scheduling of current downlink transmission block based on CQI value not yet reach CQI maximum in basic CQI mapping form, then illustrate that the SINR value of terminal present channel does not exceed the mapping range of basic CQI mapping form, does not still need the expansion CQI mapping form of the more high modulation mode that switches to; Equally, if the transfer rate of the MCS used during downlink transfer Bulk transport is less than the transfer rate corresponding to CQI maximum of basic CQI mapping form, then illustrating that the transmission correctness of this downstream transmission blocks is not enough to the foundation as carrying out CQI mapping form switching judging, at this moment can continue to use basic CQ mapping form.Only has two results judged to be just to be switched to when being the expansion CQI mapping form based on more high modulation mode.Like this, the present invention can make full use of existing basic mapping form, just switches, thus can reduce unnecessary switching when there being suitable network environment to create the demand switched to expansion mapping form, keep the quantified precision of CSI feedback, more rationally utilize channel capacity fully.
In addition, also can be that, in above-mentioned base station apparatus, each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value; When described two judge results be, the described ACK/NACK information that described high-rise linking element receives according to described receiving element is further that NACK or ACK is to accumulation bias S offsetupgrade, and judge to employ the high order modulation mapping thresholding T corresponding to CQI that transfer rate is minimum simultaneously in described expansion CQI mapping form high, whether be less than the mapping thresholding T corresponding to CQI maximum in basic CQI mapping form lowwith the described accumulation bias S after renewal offsetsum, if T high<T low+ S offset, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation, described accumulation bias S offsetinitial value be 0dB, if described ACK/NACK information is ACK, then described accumulation bias S offsetbe updated to S offset=S offset+ Step up, wherein Step upfor receiving stepping skew during information Successful transmissions, if described ACK/NACK information is NACK, then described accumulation bias S offsetbe updated to S offset=S offset-Step down, wherein Step downstepping skew during transmission unsuccessful for information, Step upand Step downbe respectively the fixed value within the scope of 0.04dB ~ 0.2dB and 0.4dB ~ 1dB.
Thus, the present invention is by arranging the accumulated value S based on constantly updating offsetwhether trigger the judgement of reconfiguration course, can avoid " ping-pong " that instantaneity judgment mechanism may bring, avoid the waste of resource, reshuffling between the CQI mapping form realizing being more suitable for practical application.
In addition, also can be that, in above-mentioned base station apparatus, described high-rise linking element, before carrying out described two judgements, first judging whether current downlink transmission block is first transmission, when being first transmission, then carrying out described two judgements.
If current downlink transmission block is re-transmission of blocks, the foundation of the mapping range of current C QI mapping form then whether can not have been exceeded as the SINR value of present channel, therefore just carrying out when being judged as YES first transmission above-mentionedly whether triggering the judgement of reshuffling, can realize more close to the system of practical application request.
In addition, also can be that, in above-mentioned base station apparatus, each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value; The CSI feedback object of terminal installation current use expansion CQI mapping form time, when described high-rise linking element judges that current downlink transmission block is dispatched based on CQI value whether be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, according to judged result to accumulation bias K offsetupgrade, and judge the mapping thresholding TH in basic CQI mapping form corresponding to CQI maximum lowwhether be greater than in expansion CQI mapping form and employ the high order modulation mapping thresholding TH corresponding to CQI that transfer rate is minimum simultaneously highk is offset with the accumulation after upgrading offsetsum, if TH low>TH high+ k offset, then basic CQI mapping form is specified to this CSI feedback object of this terminal installation, described accumulation bias K offsetinitial value is 0dB, if when being judged as that described current downlink transmission block is dispatched based on CQI value be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset+ R up, wherein this R upfor receiving the stepping deviant during CQI using high order modulation, the product that the difference of the minimum CQI of high-order modulating is multiplied by the 1st setting is used to decide according to reporting in CQI and expansion CQI mapping form, if when being judged as that described current downlink transmission block is dispatched based on CQI value be less than the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset-R down, wherein this R downfor receiving the stepping deviant during CQI of non-usage high order modulation, use the minimum CQI of high-order modulating according in expansion CQI mapping form and report the product that the difference of CQI is multiplied by the 2nd setting to determine, described 1st setting and described 2nd setting are be greater than 0 arbitrary value being less than 1, and described 2nd setting is less than described 1st setting.
Thus, the invention provides switches from expansion CQI mapping form to basic CQI mapping form reshuffle mechanism, and reshuffle in mechanism at this accumulated value K be also provided with based on continuous renewal offsetwhether trigger the judgement of reconfiguration course, therefore can avoid " ping-pong " that instantaneity judgment mechanism may bring, avoid the waste of resource, reshuffling between the CQI mapping form realizing being more suitable for practical application.
In addition, also can be that, in above-mentioned base station apparatus, the CQI index number in described basic CQI mapping form is identical with the CQI index number in described expansion CQI indexed table.
Between new expansion CQI mapping form with existing basic CQI mapping form, the number of CQI index is equal can keep in the same size between form, can save the time of a lot of otherwise redesign like this, keep good backwards compatibility.
In addition, also can be that in above-mentioned base station apparatus, the modulation system in described basic CQI mapping form comprises QPSK, 16QAM, 64QAM, and described high-order modulating is the modulation system of order of modulation at more than 256QAM.
The present invention also provides the data communications method in a kind of wireless communication system corresponding with above-mentioned base station apparatus, the feedback information produced based on CQI form is utilized between base station apparatus and terminal installation, determine Modulation and Coding Scheme, data-signal is sent and receives, it is characterized in that, this data communications method comprises the steps: receiving step, and described base station apparatus receives the channel condition information comprising the CQI index representing channel quality from described terminal installation, high-rise link step, described base station apparatus produces high-level signaling and sends signal and send to terminal installation, described base station apparatus is also according to the channel condition information that described receiving step receives, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in described basic CQI mapping form, information gathering procedure, CQI index-mapping is Signal to Interference plus Noise Ratio information by the basic CQI mapping form for terminal installation of described base station apparatus specified by described high-rise link step or expansion CQI mapping form, scheduling steps, the Signal to Interference plus Noise Ratio information that described base station apparatus maps according to described information gathering procedure, carries out channel resource allocation to terminal installation and selects Modulation and Coding Scheme, and forwarding step, described base station apparatus, according to the resource allocation result of described scheduling steps and Modulation and Coding Scheme selection result, generates downstream transmission signals and sends to described terminal installation.
Therefore, according to the present invention, by transmit on high-rise link for configure specific CSI feedback object based on the information of CQI mapping form, network can carry out the selection of the MCS form of downlink data transmission flexibly according to the disturbance regime of particular terminal and real-time transmission mode, making to introduce new efficient modulation mode becomes possibility.
Owing to invention enhances the accuracy of feedback and scheduling, improve the upper limit of transmission rate in network, be conducive to fully excavating the channel capacity under special scenes, therefore, the performance of network can effectively be promoted.
Accompanying drawing explanation
Fig. 1 is the schematic diagram representing in the present invention the typical scene comprising Microcell and macrocell.
Fig. 2 is the exemplary plot of the basic CQI mapping form of the low-order-modulated technology that only comprises represented in the present invention.
Fig. 3 is the Sample Scenario figure of the multiple CSI feedback objects to terminal configuration represented in the present invention.
Fig. 4 is the exemplary plot containing the expansion CQI mapping form of new high-order modulating represented in the present invention.
Fig. 5 is the inside of base station block diagram that the support high-order modulating represented in the present invention is introduced.
Fig. 6 is the exemplary plot of the base station side RRM measurement result storage list represented in the present invention.
Fig. 7 is the exemplary plot of the base station side SINR information storage list represented in the present invention.
Fig. 8 is the exemplary plot of the base station side HARQ message store table represented in the present invention.
Fig. 9 is the exemplary plot of the CSI feedback relevant configuration information of the high-rise configuration information storage list of the base station side represented in the present invention.
Figure 10 is the flow chart that the basic CQI mapping form never comprising high order modulation represented in the present invention switches to the expansion CQI mapping form containing high order modulation.
Figure 11 is the flow chart switched to the basic CQI mapping form not comprising high order modulation from the expansion CQI mapping form containing high order modulation represented in the present invention
Figure 12 is the exemplary plot of the base station side CQI historical information storage list represented in the present invention.
Figure 13 is the sequential exemplary plot of the complete base station-terminal downlink data transmission represented in the present invention.
Figure 14 is the format sample figure representing in the present invention the signaling information that involved high-rise link transmits.
Figure 15 is the flow example figure of the downlink data transmission represented in the present invention.
Figure 16 is the MCS-TBS index mapping table exemplary plot represented in the present invention.
Figure 17 is the TBS index-TBS mapping table exemplary plot represented in the present invention.
Figure 18 is the format sample figure being used to indicate the Downlink Control Information that the downstream transmission blocks of terminal to use high order modulation receives represented in the present invention.
Figure 19 is that the support represented in the present invention uses the MCS based on high order modulation to carry out the terminal inner block diagram of downlink data transmission.
Figure 20 is the exemplary plot of the CSI feedback relevant configuration information of the end side high-rise configuration information storage table represented in the present invention.
Figure 21 represents that the CSI of end side in the present invention measures the flow example figure with feedback method.
Figure 22 is the flow example figure that the downlink data represented in the present invention receives.
Figure 23 is the resource lattice exemplary plot of the downlink transfer in existing system.
Embodiment
Cellular concept in the present invention can be the scope that base station, the sector of base station, Home eNodeB (micro-base station) or transfer point (TP) etc. cover.In order to simplified characterization, represent community by the scope that base station (micro-base station) covers here.
CSI feedback objects concept in the present invention refers to terminal different channels state information reference signals in a network environment (CSI Reference Signal, CSI-RS) combination of resource and channel condition information interferometry (CSI Interference Measurement, CSI-IM) resource.Each terminal can be configured multiple CSI feedback object according to different CSI-RS and CSI-IM combination, and can for each CSI feedback object, according to the signal strength signal intensity that the CSI-RS linked based on it records, with the interference strength recorded based on CSI-IM, calculate independently and report CSI feedback information, the detail about CSI feedback object will composition graphs 3, Figure 23 be described in detail below.
CQI concept in the present invention, refers to that terminal is to the instruction of specific CSI feedback calculation and object with the instruction present channel quality reported.The SINR value calculated, according to the CQI mapping form of arranging in advance, is mapped as CQI according to certain method by terminal.Fig. 2 is the exemplary plot of the CQI mapping form (basic CQI mapping form) of the low-order-modulated mode that only comprises represented in the present invention.This form is the mapping form of the CQI adopted in existing LTE system, defines each CQI index(CQI index, gets the value from 0 ~ 15) modulation system 202 of 201 correspondences and encoder bit rate 203.Form give simultaneously this modulation system and code check combine under efficiency of transmission 204.The basic CQI mapping form mentioned in the present invention includes but not limited to the corresponding relation of the CQI index that this example form provides and modulation system and code check, of the present invention the CQI mapping form (basic CQI mapping form) comprising low-order-modulated mode is as long as define the corresponding relation between CQI and modulation system and code check, wherein modulation system can be such as the modulation system of order of modulation at below 64QAM, include but not limited to QPSK, 16QAM, 64QAM.The CQI mapping process of terminal on specific CSI feedback object is the SINR based on calculating, and produces the combination of a modulation system of recommending to base station and encoder bit rate according to certain method.The method producing above-mentioned mapping can be the method continued to use in LTE system, also can be other attainable method, and these are all known to those skilled in the art, and yet not directly related with the present invention content, does not repeat them here.
Fig. 3 is the Sample Scenario figure of the multiple CSI feedback objects to terminal configuration represented in the present invention.As shown in Figure 3, two micro-base stations 102 form two adjacent communities respectively.Each terminal 103 that there is an active state in each community, wherein terminal 1 is positioned at the community that micro-base station 1 is formed, and terminal 2 is positioned at the community that micro-base station 2 is formed.Terminal 1 accesses micro-base station 1, but meanwhile because it is positioned at the intersection of Liang Ge community, can receive from the useful signal 301 of micro-base station 1 and the interference signal 302 from micro-base station 2 simultaneously.In order to promote the channel quality of terminal 1, different sights can be considered, such as, micro-base station 2 can be made to mourn in silence in part subframe, thus eliminate the interference for terminal 1 in these subframes.Promote terminal 1 channel quality and be not limited to this sight, it is also conceivable to other sights, and in order to obtain accurate CSI information respectively for sights different under the scene of Fig. 3, introduce the concept of CSI feedback object, under different CSI feedback object linking to different sights CSI-RS and CSI-IM resource combination on, the combination of different CSI-RS and CSI-IM resource is then respectively used to reflect channel conditions and the disturbance regime of the useful signal under the different sights considered, Figure 23 is utilized to further illustrate the concept of the accurate CSI feedback object of the different sights corresponding to Fig. 3.
Figure 23 is the resource lattice example of the downlink transfer in existing system.Cell reference signals 2301 is the distinctive reference signals in community, for the channel measurement under physical layer measurement and some transmission mode.PDCCH resource element 2302 for transmitting PDCCH signal, bearing downlink control information.PDSCH resource element 2303 for transmitting PDSCH signal, bearing downlink data.In order to strengthen CSI feedback precision, network can be the multiple CSI-RS of same terminal configuration and CSI-IM resource.For the terminal 1 in Fig. 3, its stronger signal received comes from micro-base station 1 and micro-base station 2, therefore network is its configuration two CSI-RS, wherein CSI-RS 1(2304) sent by micro-base station 1, terminal 1 can by the channel state parameter of this resource measurement micro-base station 1-terminal 1; CSI-RS 2(2305) sent by micro-base station 2, terminal 1 can by the channel state parameter of this resource measurement micro-base station 2-terminal 1.Meanwhile, network is its configuration two CSI-IM resources, wherein CSI-IM resource 1(2306) above there is the signal sent by micro-base station 2, the interference brought when terminal 1 can be worked by the micro-base station 2 of this resource measurement; CSI-IM resource 2(2307) on there is not the signal sent by micro-base station 2, the interference brought when terminal 1 can be mourned in silence by the micro-base station 2 of this resource measurement.
Configuring in the example of multiple feedback target for terminal 1 shown in Fig. 3, can be: the CSI-RS 1 that CSI feedback object 1 is linked to and the combination of CSI-IM resource 1, then the CSI that CSI feedback object 1 reports be directed to signal from micro-base station 1 and the interference signal of micro-base station 2 exist situation; The CSI-RS 1 that CSI feedback object 2 is linked to and the combination of CSI-IM resource 2, then the CSI that CSI feedback object 2 reports is directed to signal from micro-base station 1 and the non-existent situation of interference signal of micro-base station 2; The CSI-RS 2 that CSI feedback object 3 is linked to and the combination of CSI-IM resource 2, then the CSI that CSI feedback object 3 reports is directed to signal from micro-base station 2 and the non-existent situation of interference signal of micro-base station 1.Now CSI feedback object 1 ~ 3 is as mentioned above corresponding above-mentioned 3 kinds of different sights, wherein CSI feedback object 2 calculates, namely when mourn in silence in micro-base station 2, the SINR value of down channel and the channel capacity value of correspondence may higher than reached at the upper limits of the even traditional LTE network of CSI feedback object 1, therefore there is following possibility, namely being used when dynamically mourning in silence in micro-base station 2 high-order modulating of more than 256QAM can promote reached at the transmission rate of terminal 1.Now CSI feedback object 2 can use the CQI mapping form containing new high-order modulating of the present invention.Similar, for CSI feedback object 3, although be weaker than the signal from micro-base station 1 from the signal of micro-base station 2, owing to there is not strong jamming, the CQI mapping form containing new high-order modulating of the present invention therefore can be used equally.
Fig. 4 represents the exemplary plot containing the CQI mapping form (expansion CQI mapping form) of new high-order modulating of the present invention.The part identical to the CQI mapping form with Fig. 2 adopts identical Reference numeral to be described.The form of Fig. 4 defines modulation system 202 corresponding to each CQI index201 equally, form give simultaneously the encoder bit rate 203 corresponding with each CQI index and this modulation system and code check combine under efficiency of transmission 204.This form is to add compared to the feature of the existing CQI mapping form of earlier figures 2 and specifies corresponding CQI index based on more high-order modulating as the combination of 256QAM and different code check.The expansion CQI mapping form containing new high-order modulating of the present invention includes but not limited to the corresponding relation of the CQI index that this example form provides and modulation system and code check; In addition, in the form of Fig. 4, in the number of CQI index and the form of Fig. 2, the number of CQI index is identical, be 0 ~ 15, between new expansion CQI mapping form with existing basic CQI mapping form, the number of CQI index is equal can keep in the same size between form, can save the time of a lot of otherwise redesign like this.As long as the CQI mapping form (expansion CQI mapping form) of new high-order modulating that contains of the present invention is the corresponding relation defining CQI and expand between modulation system and code check, wherein so-called expansion modulation system comprises modulation system in above-mentioned basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in basic CQI mapping form, preferably, between new expansion CQI mapping form with existing basic CQI mapping form, the number of CQI index is equal, here high-order modulating can be such as the modulation system of order of modulation at more than 256QAM.The CQI mapping process of terminal on specific CSI feedback object is the SINR based on calculating, and produces the combination of a modulation system of recommending to base station and encoder bit rate according to certain method.Equally, the method producing above-mentioned mapping can be the method continued to use in LTE system, also can be other attainable method, and these are all known to those skilled in the art, and yet not directly related with the present invention content, does not repeat them here.
Fig. 5 is the inside of base station block diagram that the support high-order modulating in the present invention is introduced.
As shown in Figure 5, support that the base station that high-order modulating is introduced mainly has: high-level signaling dispensing unit 517, high layer information processing unit 520, physical layer receiving element 501, physical layer transmitting element 516, information collection unit 502, CQI mapping form decision package 528, memory cell 523, scheduling unit 507, PDCCH generation unit 510 and PDSCH generation unit 512.
Specifically, high-level signaling dispensing unit 517 and high layer information processing unit 520 are modules relevant with high-rise link behavior.Described high-rise link refers in a communications system, according to the virtual logical communications links set up between the high layer function entity of hierarchical mode on physical layer.Described high layer function entity, for the treatment of the information that high-rise link transmits, completes and is defined in high-rise communication function.A representative instance of the high level described in the present invention is the radio resource control layer (Radio Resource Control layer, RRC layer) in LTE system.Described high-level signaling dispensing unit 517 and high layer information processing unit 520 for setting up high-rise link between base station and particular terminal, the information that receiving terminal reports on high-rise link, as reference signal receiving intensity (Reference SignalReceiving Power, and Reference Signal Received Quality (Reference Signal ReceivingQuality RSRP), RSRQ), and when high-rise link establishment or reshuffle is triggered, obtain and store in analyzing stored unit 523, existing information in base station, the higher layer signalling message for this particular UE is produced with this, semi-static configuration is carried out to the process of physical layer.
The process of described reception RSRP and RSRQ reporting information, refer to that the data flow that terminal sends on high-rise link is extracted by high-level signaling Received signal strength 522 in base station, then extracted the RSRP/RSRQ information in data flow by the RSRP/RSRQ measurement report processing unit 521 comprised in described high layer information processing unit 520, obtain RSRP or the RSRQ value that terminal pins obtains each cell measurement.
The production process of described higher layer signalling message, refers to that base station is by the CSI feedback object that comprises in described high-level signaling dispensing unit 517 and CQI form dispensing unit 518, carries out the configuration of CQI mapping form to the specific CSI feedback object of particular terminal.Above-mentioned CSI feedback object and CQI form dispensing unit 518 high-rise link between base station with particular UE is set up or reshuffles when being triggered, utilize the existing information in base station, generate higher layer signalling message, the CQI mapping form used when producing channel condition information to the specific CSI feedback object of particular terminal is specified, and the result that CQI mapping form is specified is stored in high-rise configuration information storage table 527 described later.High-level signaling comprises the configuration information relevant with CQI mapping form, when being configured multiple CSI feedback object, can carry out the configuration of CQI mapping form for different CSI feedback objects respectively.Concrete high-level signaling form describes later.The high-level signaling produced sends signal 519 and is sent to object UE by high-level signaling link.
Base station sends signal 519 by sending the high-level signaling comprising high-level signaling, the specific CSI feedback object of designated terminal can use specific CQI mapping form, to obtain the accurate channel quality information of applicable high order modulation application.
In addition, physical layer receiving element 501 to be sent to data and the signaling of base station by up channel for receiving terminal in community, complete the process of a series of signal reception aspects such as radio frequency processing, base band demodulating and decoding, obtain concrete upstream data and signaling information.
Physical layer transmitting element 516 for PDSCH, PDCCH of generation and reference signal etc. are mapped to running time-frequency resource, and completes base band-radio frequency conversion, and the multiple antennas utilizing base station to have, send downstream signal.
Physical layer receiving element 501 and physical layer transmitting element 516, can with reference to the correlation modules in traditional base station as the module of base station in physical layer transceiver data, and the input and output hardware applied in existing base station is realized.Therefore, detailed description is omitted at this.
The necessary information of information collection unit 502 for collecting base station and to be configured for descending UE or needed for Resourse Distribute.Described information collection unit 502 comprises: physical layer information feedback processing unit 503, store the information in table 527 based on the high-rise configuration information stored in the memory cell 523 of this base station, distinguish and process the feedback information that in community, different UEs reports based on different CSI feedback object; ACK/NACK collector unit 504, collects the ACK/NACK information that in community, different UEs reports, and is stored in the HARQ message store table of memory cell 523; The basic CQI map unit 505 of CQI to SINR mapping is carried out based on basic CQI mapping form, when the CQI mapping form that specific CSI feedback object configures is basic CQI mapping form, be stored in the SINR information storage list 525 of memory cell 523 after CQI being mapped as SINR value; And the expansion CQI map unit 506 of CQI to SINR mapping is carried out based on expansion CQI mapping form, when the CQI mapping form that specific CSI feedback object configures is CQI mapping form (the expansion CQI mapping form) containing high-order modulating, be stored into after CQI being mapped as SINR value in the SINR information storage list 525 of memory cell 523.
Memory cell 523 is for storing base station in physical layer and high-rise relevant information.Store in described memory cell 523: RRM measurement result storage list 524, for storing RRM (the Radio Resource Management of each active terminal in community, RRM) measurement result, and upgrade based on the output of high layer information processing unit 520; SINR information storage list 525, for storing the Signal to Interference plus Noise Ratio value (SINR) of the base station-terminal link of each active terminal in community, and upgrades based on the output of basic CQI map unit 505 and expansion CQI map unit 506; HARQ message store table 526, for the HARQ information of active interrupt all in storage networking, and upgrades based on the output of ACK/NACK collector unit 504; High-rise configuration information stores table 527, for recording the higher layer signalling message that base station has been transmitted by high-rise link to each terminal, and upgrade based on the designated result that the CSI feedback object of the CSI feedback object comprised in high-level signaling dispensing unit 517 and CQI form dispensing unit 518 pairs of terminals carries out the configuration of CQI mapping form; And CQI historical storage table 529, for storing the CQI historical information that in community, each CSI feedback object of each active terminal reports.Content about each message store table in memory cell is described in detail with reference to accompanying drawing 6 ~ 8, accompanying drawing 12 afterwards.
Scheduling unit 507, for based on the signal source of terminal installation in regulation goal subframe and disturbance regime, determines corresponding CSI feedback object, distributes and the selection etc. of Modulation and Coding Scheme to the channel resource of reality.MCS/TBS map unit 508 and resource allocation decisions unit 509 is comprised in described scheduling unit 507.First described resource allocation decisions unit 509 determines the user that can obtain down time-frequency resource in certain downlink transfer opportunity, and distributes corresponding downlink resource for the user of each acquisition transmission opportunity.Described MCS/TBS map unit 508 is subsequently based on MCS and the corresponding transmission block size (Transport Block Size, TBS) of the SINR value determination downlink transfer use stored in resource allocation decisions and SINR information storage list 525.
PDCCH generation unit 510 is for generation of downlink signaling and generate corresponding downstream signal.Comprise downlink signaling generation unit 511 in described PDCCH generation unit 510, according to scheduling of resource decision-making and the MCS/TBS decision-making of scheduling unit 507, produce the Downlink Control Information for particular terminal.Generate downstream signal after Downlink Control Information encoded modulation, indicating target terminal carries out corresponding reception behavior features.
PDSCH generation unit 512 is for generating downlink data signal and reference signal.Comprise in described PDSCH generation unit 512: data-signal generation unit 513, based on the MCS/TBS decision-making of scheduling unit 507, produce the transmission block for each scheduled user and generate downlink data signal through coded modulation and subsequent processes; Reference signal generation unit 514, produces the downlink reference signals such as CRS, CSI-RS and DM-RS according to high level configuration and scheduling decision; Downstream transmission signals generation unit 515, for the data-signal of each user, reference signal is multiplexing in running time-frequency resource lattice, produces downstream transmission signals.
CQI mapping form decision package 528 arranges suitable CQI mapping form for each CSI feedback object for each terminal.The feedback information that described CQI mapping form decision package 528 utilizes information collection unit 502 to obtain, performs CQI mapping form decision-making technique for target CS I feedback target.When a given condition is fulfilled, the high-rise reconfiguration course of trigger target CSI feedback object, switches to expansion CQI mapping form, maybe expansion CQI mapping form is switched to basic CQI mapping form by basic CQI mapping form.The example of described CQI mapping form decision-making technique as shown in Figure 10 and Figure 11.
During base station is in Figure 5 formed, high-level signaling dispensing unit 517, high layer information processing unit 520 and CQI mapping form decision package 528 corresponds to " high-rise linking element ", produces high-level signaling and sends signal and send to terminal.The channel condition information that this high-rise linking element receives according to receiving element, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in substantially described CQI mapping form, physical layer receiving element 501 corresponds to " receiving element ", receives the channel condition information comprising the CQI index representing channel quality from described terminal installation, information collection unit 502 corresponds to " information collection unit ", and CQI index-mapping is Signal to Interference plus Noise Ratio information by the basic CQI mapping form for terminal installation specified by described high-rise linking element or expansion CQI mapping form, scheduling unit 507 corresponds to " scheduling unit ", according to the Signal to Interference plus Noise Ratio information that described information collection unit maps, carries out channel resource allocation and select Modulation and Coding Scheme to terminal installation, physical layer transmitting element 516, PDCCH generation unit 510 and PDSCH generation unit 512 corresponds to " transmitting element ", according to resource allocation result and the Modulation and Coding Scheme selection result of described scheduling unit, generate downstream transmission signals and send to described terminal installation.
Below the form of the form stored in memory cell 523 is described.
Fig. 6 is the exemplary plot of the RRM measurement result storage list 524 of base station side in the present invention.As shown in Figure 6, RRM measurement result storage list 524 is for recording the RRM measurement result of each terminal in current area.Specifically, the project of data field comprises: Termination ID 601, records the current ID being associated with the terminal of this community; Community ID602, record the RRM measurement result of each terminal to report for the ID of community; RSRP measurement result 603, records the RSRP measurement result that the community ID of each terminal pins to its correspondence reports; RSRQ measurement result 604, records the RSRQ measurement result that the community ID of each terminal pins to its correspondence reports.
Fig. 7 is the exemplary plot of the SINR information storage list 525 represented in the present invention.As shown in Figure 7, SINR information storage list 525 is for recording the base station-terminal link channel quality information of active terminal in current area.Specifically, the project of data field comprises: Termination ID 701, records the current ID being associated with the terminal of this community; CSI feedback object ID 702, records the ID of the CSI feedback object that each terminal configures; SINR measurement result 703, record the SINR measurement result that each terminal pins reports the CSI feedback object that it configures, the concrete numerical value of SINR measurement result 703 can upgrade according to the mapping result of basic CQI map unit 505 or expansion CQI map unit 506.
Fig. 8 is the exemplary plot of the HARQ message store table 526 represented in the present invention.As shown in Figure 8, HARQ message store table 526 is for recording the HARQ progress information of active terminal in current area.Specifically, the project of data field comprises: Termination ID 801, records the current ID being associated with the terminal of this community; HARQ process number 802, No. ID that records each HARQ process of each terminal.Be FDD LTE in example, therefore the supported maximum HARQ process number of each terminal is 8; Redundant version number (Redundant Version, RV) 803, the redundant version number of the data bit that record specific HARQ is transmitted, the system of being convenient to carries out incremental redundancy type HARQ re-transmission; MCS information 804, the MCS that record specific HARQ process uses when last time transmits.
Fig. 9 is the exemplary plot of the CSI feedback relevant configuration information of the high-rise configuration information storage list 527 represented in the present invention.High-rise configuration information storage list 527 is for recording all concrete high-rise configuration informations establishing the terminal that RRC connects in current area.As shown in Figure 9, data field project wherein related to the present invention comprises: Termination ID 901, records the current ID being associated with the terminal of this community; CSI feedback object ID 902, records the ID of the CSI feedback object that each terminal configures; CSI-RS ID903, records the CSI-RS target of specific CSI feedback object linking; CSI-IM resource ID 904, records the CSI-IM resource object of specific CSI feedback object linking; CQI mapping form information flag 905, represents the CQI mapping form that specific CSI feedback object uses when producing CSI feedback information.In this example, the information flag of CQI mapping form means and uses the basic CQI mapping form shown in Fig. 2 for 1, and the information flag of CQI mapping form means and uses the expansion CQI mapping form shown in Fig. 4 for 2.Whether high order modulation configuration mark 906, open the transfer function based on high order modulation to this terminal for recording.Only have this data field to be true, the configuration of CQI mapping form and the process such as downlink transfer based on the high order modulation of expansion CQI mapping form just can be carried out expanding to counterpart terminal in base station.The setting of base station to the high order modulation configuration mark of terminal can have numerous embodiments, such as whether can have the hardware capabilities such as the demodulation chip of support high order modulation (such as 256QAM) to set according to terminal, possess when supporting the hardware capabilities of high order modulation and this mark is set as true, otherwise be set as false.
Being 1 for Termination ID in terminal 1(Fig. 9 901 in this example) configuration is as aforementioned composition graphs 3 and Figure 23 explanation, (in Fig. 9, Termination ID 901 is 1 in the combination of the CSI-RS 1 be linked to due to CSI feedback object 1 and CSI-IM resource 1, CSI feedback object ID 902 is that the CSI-RS ID903 of the list item of 1 and CSI-IM resource ID 904 are 1), namely the CSI that CSI feedback object 1 reports be directed to signal from micro-base station 1 and the interference signal of micro-base station 2 exist signal and disturbance regime (sight), therefore CSI feedback object 1 can not obtain good SINR value, basic CQI mapping form (in Fig. 9, CQI mapping form information flag 905 is 1) is configured to it.And the combination of the CSI-RS 1 be linked to due to the CSI feedback object 2 of terminal 1 and CSI-IM resource 2 (in Fig. 9, Termination ID 901 is 1, CSI feedback object ID 902 is the CSI-RS ID903 of the list item of 2 is 1, CSI-IM resource ID 904 is 2), namely the CSI that CSI feedback object 2 reports is directed to signal from micro-base station 1 and the non-existent signal of interference signal of micro-base station 2 and disturbance regime (sight), therefore CSI feedback object can obtain good SINR value, and this SINR value is beyond the mapping range of basic CQI mapping form, therefore to its configuration expansion CQI mapping form (in Fig. 9, CQI mapping form information flag 905 is 2).The method of expansion CQI mapping form is configured and detailed process will be described below for terminal 1.
Equally, terminal 2 in the example of Fig. 3 is in the center of Serving cell, interference strength from other communities is lower, therefore network is only its configuration 1 CSI feedback object, and due to channel quality good, be configured with expansion CQI mapping form (in Fig. 9, Termination ID is 2, CSI feedback object ID be the CQI mapping form information flag 905 of the list item of 1 is 2) by CQI mapping form collocation method equally.And not shown in the terminal N(Fig. 3 shown in Fig. 9) owing to being positioned at the intersection of multiple community, the interference signal received is more and stronger, mourn in silence to wherein several interference source and can not bring obvious performance boost, therefore configured CSI feedback object all can only use basic CQI mapping form (in Fig. 9, Termination ID is N, CSI feedback object ID is that the CQI mapping form information flag 905 of the list item of 1 or 2 is 1).
Figure 12 is the exemplary plot of the CQI historical information storage list 529 represented in the present invention.As shown in figure 12, CQI historical information storage list 529 is for recording the history CQI that in current area, each CSI feedback object of active terminal reports.Specifically, the project of data field comprises: Termination ID 1201, records the current ID being associated with the terminal of this community; CSI feedback object ID 1202, records the ID of the CSI feedback object that each terminal configures; Receive subframe numbers 1203, the subframe that record terminal receives the CQI that specific CSI feedback object reports indicates.CQI measurement 1204, records the CQI measurement that each terminal pins reports in corresponding subframe the CSI feedback object that it configures.In CQI historical information storage list 529 row number with report the number of times of history CQI and judge that the window size whether history CQI retains is corresponding.Time of reception can constantly be eliminated early than the history CQI of window ranges.In CQI historical information storage list 529, the number of row is as shown in the ellipsis of mid portion, can increase according to actual conditions or reduce.
Figure 10 is that the high-rise link represented in the present invention carries out CQI mapping form from basic CQI mapping form to the flow chart of expansion CQI mapping form switching, is performed by the CQI mapping form decision package 528 in base station.In order to simplified characterization, below the basic CQI mapping form only comprising low-order-modulated is defined as CQI_table n-1, the expansion CQI mapping form containing more high order modulation is defined as CQI_table n.Support in the present invention that the total number of the CQI_table that the system using the MCS of high order modulation to carry out transmitting comprises is at least 2(N and is more than or equal to 2).
Base station only can configure to high order modulation the terminal that mark 906 is true and perform the method.Be configured for the CSI feedback object of base station to terminal 1.What represent due to Figure 10 is the flow process switched to expansion CQI mapping form from basic CQI mapping form, and therefore under assumed initial state, all CSI feedback objects of terminal 1 use basic CQI mapping form (CQI_table n-1).
CQI mapping form decision package 528 is after receiving the ACK/NACK information (step 1001) from ACK/NACK collector unit 504, signal when first judging its corresponding downlink transfer Bulk transport and disturbance regime, according to CSI-RS and CSI-IM that all CSI feedback objects recorded in high-rise configuration information storage list 527 link, find out the CSI feedback object (obtain corresponding CSI feedback object ID, step 1002) corresponding with judged signal and disturbance regime (i.e. CSI-RS and CSI-IM).After finding corresponding CSI feedback object, as CSI feedback object 3, decision package judges this downstream transmission blocks whether first transmission but not retransmit that (this judgement can take any attainable method of prior art based on HARQ message store table 526, do not repeat them here), and the CQI mapping form CQI_table of the corresponding current use of CSI feedback object is judged based on high-rise configuration information storage list 527 n-1whether (basic CQI mapping form as shown in Figure 2) exists next stage CQI mapping form CQI_table n(that is, whether the CQI mapping form information flag 905 in the high-rise configuration information storage list 527 such as, shown in Fig. 9 corresponding to CSI feedback object is 1) (step 1003).If these two judge not to be yes entirely, then decision process terminates; Judging that downstream transmission blocks is first transmission and judges the CQI mapping form CQI_table of the corresponding current use of CSI feedback object n-1there is next stage CQI mapping form CQI_table n(Termination ID is as shown in Figure 9 the CQI mapping form information flag 905 of the CSI feedback object 3 of 1 is 1, express possibility and switch to expansion CQI mapping form) time, when decision package reads this downlink transfer block dispatching from CQI historical information storage list 529 based on CQI value, and judge whether it equals CQI_table n-1cQI maximum (CQI15 as in Fig. 2) (step 1004).If not, then illustrate that the SINR value of terminal present channel does not exceed the mapping range of basic CQI mapping form, still do not need the expansion CQI mapping form of the more high modulation mode that switches to, therefore decision process terminates; Whether the transfer rate of the MCS used when if so, then decision package judges this downlink transfer Bulk transport based on HARQ message store table 526 is further more than or equal to CQI_table n-1transfer rate (step 1005) corresponding to CQI maximum.If not, then illustrate that the transmission correctness of this downstream transmission blocks is not enough to the foundation as carrying out CQI mapping form switching judging, decision process terminates; If so, then can the reconfiguration course of the high-rise link of trigger base station and terminal, be CQI_table for CSI feedback object 3 reconfigures CQI mapping form n(step 1010).
In the above-mentioned methods, can the reconfiguration course of the direct high-rise link of trigger base station and terminal after step 1005 is judged as YES, be CQI_table for CSI feedback object 3 reconfigures CQI mapping form n(step 1010), but the judgment mechanism of such instantaneity can produce so-called " ping-pong " most probably, causes CQI mapping table basic and cut between expansion, thus brings the waste of resource.
For avoiding such problem, method of the present invention by as shown in the step 1006 in Figure 10 ~ 1009, can also increase the accumulated value S according to constantly updating offsetwhether trigger the judgement of reconfiguration course.That is, when being judged as YES in step 1005, decision package judges that this feedback information is NACK or ACK(step 1006 further), according to judged result to accumulation bias S offsetupgrade, and judge to employ the high order modulation mapping thresholding T corresponding to CQI that transfer rate is minimum simultaneously in expansion CQI mapping form high, whether be less than the mapping thresholding T corresponding to CQI maximum in basic CQI mapping form lowwith the described accumulation bias S after renewal offsetsum, namely judges whether T high<T low+ S offsetif judged result is no, then decision process terminates; If the determination result is YES, then the reconfiguration course of trigger base station and the high-rise link of terminal, specifies expansion CQI mapping form to this CSI feedback object of this terminal installation.
Described accumulation bias S offsetthe mode of each downlink transfer effect is carried out renewals and is accumulated by quantifying, represent the CQI mapping form of current use result of use and to the necessity of next stage CQI mapping form and possibility.Specifically, described S offset0dB can be initialized to and dynamically update according to downlink transfer.In described renewal process, if receive information as ACK and corresponding downstream transmission blocks are successfully received, then upgrade S offset=S offset+ Step up(step 1007), wherein Step upfor receiving stepping skew during information Successful transmissions, as 0.055dB.If receive information as NACK and corresponding downstream transmission blocks fail reception, then upgrade S offset=S offset-Step down(step 1008), wherein Step downstepping skew during transmission unsuccessful for information, as 0.5dB.At accumulation bias S offsetafter renewal, decision package judges CQI_table ninside employ the high order modulation CQI(that simultaneously transfer rate is minimum as the CQI12 in Fig. 4) mapping thresholding T highwhether (as 21dB), be less than CQI_table n-1the mapping thresholding T of CQI maximum low(as 19dB) and accumulation bias S offsetsum (step 1009).If not, then decision process terminates; If so, the reconfiguration course of the then high-rise link of trigger base station and terminal, is CQI_table for CSI feedback object 3 reconfigures CQI mapping form n(step 1010).So far decision process terminates (step 1011).Above-mentioned mapping thresholding T is as known to the skilled person, and be the value reflecting man-to-man mapping ruler between CQI and SINR value, its value freely can determine within the specific limits when realizing.If the mapping thresholding of such as CQI value 14 is defined as 17dB, then a SINR value lower than 17dB can not be mapped as CQI14, and a SINR value higher than 17dB, if it not simultaneously higher than the mapping thresholding (as 19dB) of CQI15, then will be mapped as CQI14.
In addition, above-mentioned stepping skew Step upand Step downbe respectively the fixed value within the scope of 0.04dB ~ 0.2dB and 0.4dB ~ 1dB.The switching of CQI mapping form should be enable during value to occur after step 1002 ~ 1005 are all met and reach a rational number of times, and the numerical value of above-mentioned 0.055dB and 0.5dB is example, Step downvalue should be greater than Step up.
Figure 11 is the flow chart that the high-rise link represented in the present invention carries out CQI mapping form and switches to basic CQI mapping form from expansion CQI mapping form, and namely the CQI mapping form of specific CSI feedback object is from CQI_table nswitch to CQI_table n-1method.Performed by the CQI mapping form decision package 528 in base station.
Be configured for the CSI feedback object 2 of base station to terminal 1.Under assumed initial state, the CSI feedback object 2 of terminal 1 uses expansion CQI mapping form (CQI_table n).CQI mapping form decision package 528, after receiving the CQI information (step 1101) from physical layer feedback information process unit 503, first judges based on high-rise configuration information storage list 527 the CQI mapping form CQI_table that the CSI feedback object belonging to it uses nwhether there is upper level CQI mapping form CQI_table n-1(that is, whether the CQI mapping form information flag 905 in the high-rise configuration information storage list 527 such as, shown in Fig. 9 corresponding to CSI feedback object is 2, step 1102).If not, then illustrate that this CSI feedback object does not exist upper level CQI mapping table, therefore nature cannot switch to upper level CQI mapping table, and decision process terminates; Otherwise, when decision package reads downlink transfer block dispatching from CQI historical information storage list 529 based on CQI value, and judge whether this CQI value is more than or equal to CQI_table nthe minimum CQI(of middle use high-order modulating is as used minimum CQI and CQI12 of 256QAM in Fig. 4) (step 1103), and to accumulation bias K offsetupgrade.Described accumulation bias K offsetthe mode of the result of use of current C QI mapping form carries out renewal accumulation by quantifying, assesses the necessity to upper level CQI mapping form and possibility.Described K offset0dB can be initialized to and dynamically update according to downlink transfer.In described renewal process, if the judged result of step 1103 is yes, then upgrade K offset=K offset+ R up(step 1104), wherein R upfor receiving the stepping deviant during CQI using high order modulation.This value can according to reporting CQI and CQI_table nthe difference of the minimum CQI of middle use high-order modulating determines, as worked as CQI_table nfor as shown in Figure 4, then terminal 1 reports CQI=14 on CSI feedback object 2, then R up=(14-12) * 0.2=0.4dB.If the judged result of step 1103 is no, then upgrade K offset=K offset-R down(step 1105), wherein R downfor receiving the stepping deviant during CQI of non-usage high order modulation.This value can according to CQI_table nthe minimum CQI of middle use high-order modulating with report the difference of CQI to determine, as worked as CQI_table nfor as shown in Figure 4, terminal 1 reports CQI=10 on CSI feedback object 2, then R donw=(12-10) * 0.1=0.2dB.At accumulation bias K offsetafter renewal, decision package judges CQI_table n-1the mapping thresholding TH of interior CQI maximum (CQI15 as in Fig. 2) lowwhether (as 19dB), be greater than CQI_table ninside employ the mapping thresholding TH of the high order modulation simultaneously CQI that transfer rate is minimum high(as 21dB) offsets K with accumulation offsetsum (step 1106).If not, then decision process terminates; If so, the reconfiguration course of the then high-rise link of trigger base station and terminal, is CQI_table for CSI feedback object 2 reconfigures CQI mapping form n-1(step 1107).So far decision process terminates (step 1108).
In addition, above-mentioned stepping skew R upand R downnumerical value be example, stepping skew Ru pand R downas long as use the difference of the minimum CQI of high-order modulating be multiplied by the product of the 1st setting (being 0.2 in the example of Figure 11) and expand in CQI mapping form and use the minimum CQI of high-order modulating and report the product that the difference of CQI is multiplied by the 2nd setting (being 0.1 in the example of Figure 11) to decide according to reporting in CQI and expansion CQI mapping form respectively, wherein said 1st setting and described 2nd setting are respectively the arbitrary value in 0 ~ 1 scope, and described 2nd setting is less than described 1st setting.
High-rise link shown in Figure 10 carries out method that CQI mapping form switches from from basic CQI mapping form to expansion CQI mapping form and the high-rise link shown in Figure 11 and carries out CQI mapping form and be from expansion CQI mapping form to the method that the basic CQI mapping form not comprising high order modulation switches the method example that high-rise link carries out corresponding configuration.CQI mapping form dispensing unit 528 described in the present invention also can adopt additive method to realize corresponding configuration.Such as carry out in the step 1003 of Figure 10 downstream transmission blocks whether first transmission and CSI feedback object whether can use basic CQI mapping form two judgement, but also can omit first judgement.In addition, two methods of Figure 10 and Figure 11 can merge into the data communications method in wireless communication system of the present invention, based on the Modulation and Coding Scheme determined by CQI form between base station apparatus and terminal installation, data-signal is sent and receives, this data communications method comprises the steps: receiving step, and described base station apparatus receives the channel condition information comprising the CQI index representing channel quality from described terminal installation, high-rise link step, described base station apparatus produces high-level signaling and sends signal and send to terminal installation, described base station apparatus is also according to the channel condition information that described receiving step receives, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in basic CQI mapping form, scheduling steps, described base station apparatus sends the basic CQI mapping form specified by signal according to described high-level signaling or expands CQI mapping form, carries out channel resource allocation and select Modulation and Coding Scheme to terminal installation, and forwarding step, described base station apparatus, according to the resource allocation result of described scheduling steps and Modulation and Coding Scheme selection result, generates downstream transmission signals and sends to described terminal installation.
Figure 13 is the sequential exemplary plot of the complete base station-UE downlink data transmission represented in the present invention.In fig. 13, illustrate in information feed back between a base station and a terminal the various information exchanges that may occur on the whole, and partial node behavior in the middle can use the execution mode described in the present invention.
As shown in figure 13, when terminal to apply carries out downlink data transmission or terminal is carried out to paging and will be carried out downlink data transmission in base station, first both sides set up the connection (step 1301) of high-rise link.
Base station carries out (step 1302) after decision-making based on existing information to high level configuration, and the configuration information of generation is sent to terminal (step 1303) as high-level signaling by high-rise link.This is in the execution mode each CSI feedback object of terminal being carried out to the initial configuration of CQI mapping form, can be the basic CQI mapping form that direct use does not comprise high order modulation, also can be calculate the expection wideband SINR value of each CSI feedback object also accordingly for it configures suitable CQI mapping form according to RSRP.Concrete grammar for the latter can adopt and well known to a person skilled in the art attainable any means, does not specifically describe in the present invention.
Terminal is after receiving corresponding configuration information by high-rise link, the high-level signaling according to base station is configured (step 1304), as the CQI mapping form etc. corresponding to the configuration of CSI feedback object, each CSI feedback object.Terminal is based on the allocating and measuring channel completed and produce concrete feedback information (step 1305), and uploading feedback information is to base station (step 1306).
So far preliminary high-rise link establishment and high-level signaling transmission configuration process is completed.After base station 101 receives the feedback information that terminal carries out based on high-level signaling, carry out the scheduling processes (step 1307) such as dynamic MCS decision-making and time-frequency resource allocating based on feedback information, and the instruction (step 1308) that downlink signaling information carries out correspondence is produced to the terminal be scheduled.
If this terminal is scheduled, then base station utilizes the physical layer resources of distributing to send downstream signal (step 1309) to this terminal.First terminal receives the downlink signaling information sending to oneself, based on the control information adjustment data signal reception equipment obtained, receives, generate HARQ feedback information (step 1310) simultaneously to downlink data.Meanwhile, channel measurement parallelly may carry out and produce CSI feedback information with CSI feedback systematic function (step 1305).All feedback informations are fed back to base station (step 1306) by terminal.The circulation of this process is carried out, and reshuffles be triggered (step 1311, trigger condition is as Figure 10, Figure 11) until DTD or high-rise link connect.
Be triggered if high-rise link connects to reshuffle, then base station side is carried out high level and is reshuffled and undertaken sending (step 1303) by high-rise link by the configuration information of generation.Terminal is after receiving corresponding reconfiguration information by high-rise link, the high-level signaling new according to base station is configured (step 1304), has configured channel measurement and feedback (step 1305) based on this.Physical layer procedure before being cycled to repeat after terminal, until downlink data transmission completes (step 1312).When described downlink data transmission completes, base station discharges high-rise link and connects (step 1313), and SOT state of termination becomes idle condition.
In addition, the form of high-level signaling is not particularly limited, as long as can transmit the configuration information under necessary feedback model information and this feedback model.Figure 14 is the format sample representing in the present invention the signaling information that involved high-rise link transmits.
As shown in figure 14, for the signaling information that feedback fraction is configured on high-rise link, with CSI feedback object for base unit, altogether N group CSI feedback object configuration information 1401, the wherein number of N to be base station the be CSI feedback object of terminal configuration.For CSI feedback object 1 configuration information, the data field wherein comprised has specifically: CSI-RS index1402 and CSI-IM index1403, is respectively used to indicate channel state information reference signals and channel condition information interferometry resource that this CSI feedback object is corresponding; CQI mapping form configuration information 1404, is used to indicate the CQI mapping form of this CSI feedback object configuration, and namely terminal generates the mapping foundation of CQI; Codebook configuration 1405, instruction base station allows the set of terminal operable pre-coding matrix when calculating the CSI for this CSI feedback object.
Figure 15 is the flow example figure of the downlink data transmission in the present invention.As shown in figure 15, the process of once complete downlink data transmission from the scheduling of resource of scheduling unit, to formation downstream signal being sent to terminal by antenna.The present invention is described whole flow process for proportional fair dispatching method.First the scheduling unit of base station reads in current base station the up-to-date SINR value (step 1501) having each CSI feedback object of the terminal of data transportation requirements from SINR information storage list 525, then calculate the channel efficiency of their correspondences and generate equitable proportion value (Proportional Fair metric, PF metric) (step 1502).The User Priority obtained based on PF metric value and the magnitude of load of each user, base station determine the terminal that this downlink transfer will be scheduled for and by down time-frequency Resourse Distribute give they (step 1503).After producing resource allocation decisions, the MCS(step 1504 used when counterpart terminal transmits is determined in base station based on the Signal to Interference plus Noise Ratio of terminal each in SINR information storage list 525 on the running time-frequency resource that correspondence is scheduled).Following base station by PDSCH generation unit 512 to each terminal be scheduled by MCS-transmission block size indicator (Transport Block Sizeindex, TBS index) mapping table obtains corresponding TBS index value (step 1505), resource block number according to TBSindex value and distribution obtains concrete TBS value, and generate concrete transmission block (step 1506), and generate downlink data signal (step 1507) through subsequent treatment such as coding, modulation.Base station is by PDCCH generation unit 510 simultaneously, first the high order modulation based on each terminal that is scheduled configures 906 information, determine Downlink Control Information (Downlink Control Information, DCI) length, then produces Downlink Control Information for each terminal be scheduled and generates corresponding signal (step 1508).The form of Downlink Control Information as shown in figure 18.Base station by the various signal of all terminals that is scheduled and the concrete downstream signal of the multiplexing rear generation of reference signal, and sends (step 1509) by antenna.
Figure 16 is the MCS-TBS index mapping table exemplary plot in the present invention.Form comprises following data field: MCS instruction 1601, represents the MCS value for mapping TBS index; Order of modulation 1602, represents the bit number that the single modulation symbol of modulation system that this MCS is corresponding carries; TBS instruction 1603, represents the TBS index mapping result of specific MCS.The row that in form, MCS0-31 is corresponding continues to use existing MCS-TBS index mapping form.The TBS index of the new introducing of the MCS that the use 256QAM that the line display that in form, MCS32-39 is corresponding newly adds modulates and correspondence.
Figure 17 is the TBS index-TBS mapping table exemplary plot in the present invention.Form comprises following data field: TBS instruction 1701, represents given TBS index; Resource block number 1702, the sum distributing to the Resource Block of single terminal expressed possibility; TBS value 1703, represents the TBS value during resource block number of corresponding specific T BS index and specific distribution.
Figure 18 is used to indicate the format sample figure of terminal to the Downlink Control Information that the downstream transmission blocks from base station receives in the present invention.The data field of described Downlink Control Information continues to use the definition of existing descending control information format, comprises: carrier wave instruction 1801, is used to indicate the carrier wave corresponding to this Downlink Control Information; Resourse Distribute instruction 1802, being used to indicate base station is the running time-frequency resource that target terminal distributes; Uplink power control instruction 1803, controls for power terminal being carried out to PUCCH transmission; HARQ procedure instruction 1804, be used to indicate the HARQ procedure of dispatched downlink transfer number; Data fluxion instruction 1805, is used to indicate the port numbers of the downlink data transmission be scheduled, concrete downlink data fluxion etc.; Downstream transmission blocks specifying information 1806, is used to indicate the specifying information of the downstream transmission blocks that terminal is scheduled; PDSCH data-mapping instruction 1807, is used to indicate terminal when PDSCH not transmits on serving cell, the concrete distribution of PDSCH, and is used for the auxiliary CRS signal based on the demodulation of DMRS or CSI-RS during demodulated data signal.The specifying information of two downstream transmission blocks is at the most comprised in wherein said downstream transmission blocks specifying information.The specifying information 1808 of described each transmission block comprises code modulation mode instruction 1809, is used to indicate the code modulation mode that this downstream transmission blocks of terminal uses; New data instruction 1810, being used to indicate this downstream transmission blocks is new data or re-transmission; Redundancy versions instruction 1811, is used to indicate the redundancy versions of this downstream transmission blocks.Described code modulation mode instruction 1809 is adjustable length data field, and its length is be 5 bits at the existing MCS form of use, and when using the MCS index shown in Figure 16, length is 6 bits.When base station is particular terminal generation Downlink Control Information, if the high order modulation configuration 906 of terminal is true, then the length of described code modulation mode instruction 1809 is 6 bits; If the high order modulation configuration 906 of terminal is false, then the length of described code modulation mode instruction 1809 is 5 bits.
Figure 19 is that the support in the present invention uses the MCS based on high order modulation to carry out the terminal inner block diagram of downlink data transmission.
As shown in figure 19, support to use the terminal based on the MCS of high order modulation mainly to have: high-rise link information processing unit 1916, channel estimating unit 1901, compensation unit 1902, rf receiver unit 1910, CSI computing unit 1903, PDCCH reception unit 1911, PDSCH receiving element 1914, memory cell 1907 and up transmitting element 1909 etc.
Specifically, high-rise link information processing unit 1916 is modules relevant with high-rise link behavior, for setting up high-rise link between terminal and serving BS, receive the information 1917 that base station sends on high-rise link, as CSI feedback object configuration information etc., instruction according to base station carries out semi-static configuration to self receiving function, and the high-rise configuration information of correspondence is stored into memory cell 1907.
CSI-RS and CSI-IM that channel estimating unit 1901 and compensation unit 1902 are respectively used to terminal configures measures, and obtains signal strength information and interference strength information, for the calculating of follow-up CSI.
CSI computing unit 1903 is for generation of the feedback information based on certain CSI feedback calculation and object.Can be there is multiple CSI computing unit in a terminal, be respectively used to the CSI parallel computation of the multiple CSI feedback objects to base station configuration.Exemplarily depict only two CSI computing units in figure, but CSI computing unit of the present invention can be the same number of quantity with CSI feedback object.CSI computing unit judges by signal deployment processing unit 1904 the CQI mapping form that the CSI feedback object of its correspondence uses, the signal strength information obtained and interference strength information sent into based on the CSI computing unit 1905 of basic CQI mapping form or carry out CSI calculating based on the CSI computing unit 1906 of expansion CQI mapping form, producing the CSI information that will report.
Rf receiver unit 1910 by antenna received RF signal, and is translated into baseband signal.Baseband signal is admitted in PDCCH reception unit 1911 and PDSCH receiving element 1914 respectively.First the former by baseband processing unit 1912, carry out comprising blind Detecting, the operations such as demodulating and decoding, obtain concrete descending control signaling, and produced the configuration information received for downlink data by descending control signaling processing unit 1913.PDSCH receiving element is based on the configuration information of descending control signaling processing unit 1913, as the MCS etc. that downstream transmission blocks uses, subsequent treatment is carried out by baseband processing unit 1912 pairs of baseband signals, as descrambling, demodulation code etc., obtain concrete data bit, and be further processed by downlink data processing unit 1915.
Memory cell 1907 is used for storing the various configuration informations in downlink transmission process, multidate information and buffered data etc.High-rise configuration information storage table 1908 is comprised, the high-rise configuration information of record base station-terminal link in memory cell 1907.Its division format example relevant to CSI feedback object as shown in figure 20.Also other forms should be comprised in memory cell, as HARQ message store table, HARQ data buffering area etc., due to strong with relevance of the present invention, unlisted at this.
Up transmitting element 1909 is for sending upward signal, as Physical Uplink Control Channel (PhysicalUplink Control Channel, PUCCH) upstream data that the CSI feedback information carried or Physical Uplink Control Channel (Physical Uplink Shared Channel, PUSCH) carry.The CSI information that each CSI feedback object of terminal produces, after clash handle, forms upward signal by up transmitting element and is sent to base station.
Figure 20 is the exemplary plot of the CSI feedback relevant configuration information of the end side high-rise configuration information storage table represented in the present invention.Example is configured to example with the CSI feedback object of terminal 1, and its data field comprises: CSI feedback object ID 2001, represents the ID of the CSI feedback object that terminal configures; CSI-RS ID2002, records the CSI-RS target of specific CSI feedback object linking; CSI-IM resource ID 2003, records the CSI-IM resource object of specific CSI feedback object linking; CQI mapping form information flag 2004, records the CQI mapping form that specific CSI feedback object uses when producing CSI feedback information.What use the basic CQI mapping form in this example shown in Fig. 2 is labeled as 1, and what use the expansion CQI mapping form shown in Fig. 4 is labeled as 2; High order modulation configuration mark 2005, whether record network side is the transfer function that terminal opens based on high order modulation.
Figure 21 is that the CSI of end side in the present invention measures the flow chart with feedback method.
For terminal 1, in figure 21, first terminal 1 by reception antenna and radio frequency and Base-Band Processing, obtains the signal (step 2101) on time domain and frequency domain.Then the channel estimating unit 1901 of terminal 1 carries out channel state parameter estimation (step 2102) according to the channel measurement reference signal wherein comprised, and produces actual CSI matrix H.Meanwhile, by compensation unit 1902, utilize the interferometry resource comprised in time frequency signal to carry out Interference Estimation (step 2103), draw the intensity of this moment external interference.
CSI matrix H and interference strength information are sent into each CSI computing unit 1903 by terminal.For CSI computing unit 1, signal deployment processing unit 1904 in the CSI computing unit 1 of terminal 1 reads the CQI mapping form information flag 2004 of the corresponding CSI feedback object of the storage in high-rise configuration information storage table 1908, judges whether this CSI feedback object is configured to use expansion CQI mapping form CQI_table n(step 2104).
If judged result is "Yes", then the CSI computing unit 1903 of terminal 1 utilizes the CSI computing unit 1906 based on expansion CQI mapping form, follow existing procedure, if be configured to based on the CSI feedback object 1 of best this terminal 1 of RI and PMI(of codebook selecting the pattern reporting RI and PMI), calculate Signal to Interference plus Noise Ratio now and based on the expansion CQI mapping form CQI_table containing high order modulation n(as Fig. 4) is quantified as CQI(step 2105).Specific description is omitted for existing traditional process.
If judged result is "No", then the CSI computing unit 1903 of terminal 1 utilizes the CSI computing unit 1905 based on basic CQI mapping form, follow existing procedure, if be configured to based on the CSI feedback object 1 of best this terminal 1 of RI and PMI(of codebook selecting the pattern reporting RI and PMI), calculate Signal to Interference plus Noise Ratio now and based on basic CQI mapping form CQI_table n-1(as Fig. 2) is quantified as CQI(step 2106).Specific description is omitted for existing traditional process.
The CSI information produced is stored into memory cell 1907, waits for that suitable feedback sends to base station (step 2107) by up channel opportunity.
Figure 22 is the flow example figure that the downlink data in the present invention receives.As shown in figure 22, the process that once complete downlink data receives from terminal receives radiofrequency signal by antenna, to the data message comprised in the PDSCH that decodes.First terminal receives the radiofrequency signal from base station apparatus by rf receiver unit, and sends into PDCCH reception unit and PDSCH receiving element (step 2201) after being translated into baseband signal.Then terminal judges the length (step 2202) of Downlink Control Information according to high order modulation configuration 2005 by PDCCH reception unit, the variable-length of described Downlink Control Information, and indicates the length of 1809 to determine by the code modulation mode in information.Described high order modulation configures 2005 data fields when being true, and the length of the code modulation mode instruction 1809 in described Downlink Control Information is 6 bits.Described high order modulation configures 2005 data fields when being false, and the length of the code modulation mode instruction 1809 in described Downlink Control Information is 5 bits.And carry out detection based on this length information to PDCCH to attempt, until successfully receive the Downlink Control Information (step 2203) that target is oneself.Based on described Downlink Control Information, terminal obtains the MCS index(step 2204 that each transmission block uses).Then terminal passes through descending control signaling processing unit 1913 based on MCS-transmission block size indicator (Transport Block Size index, TBS index) mapping table the TBS index value obtaining correspondence and the modulation system used, obtain concrete TBS value according to the resource block number of TBS index value and distribution again, and utilize TBS value to calculate the chnnel coding code check (step 2205) of transmission block.After obtaining these information, terminal selects suitable demodulator and decoder (step 2206) by PDSCH receiving element, and carries out the process such as follow-up demodulation, decoding to PDSCH signal, finally obtains the downlink data (step 2207) carried in PDSCH.
Namely, the present invention also provides the receiving system of the downlink data in a kind of terminal installation, based on the Modulation and Coding Scheme of being specified by base station apparatus, receive the data-signal from described base station apparatus, comprise: rf receiver unit, receive the radiofrequency signal from described base station apparatus, and after being translated into baseband signal, send into PDCCH reception unit and PDSCH receiving element, described PDCCH reception unit, whether specify this terminal installation can use the high order modulation configuration mark of high-order modulating according to the described base station apparatus of expression that this terminal installation stores, judge the length of the Downlink Control Information from described base station apparatus, length based on judged described Downlink Control Information is carried out PDCCH to the baseband signal received from described rf receiver unit and is detected trial, until successfully receive the Downlink Control Information that target is this terminal installation, and based on described Downlink Control Information, obtain the Modulation and Coding Scheme that described base station apparatus uses, described PDSCH receiving element, the modulation system that described base station apparatus uses and chnnel coding code check is determined according to the described Modulation and Coding Scheme that described PDCCH reception unit obtains, select suitable demodulator and decoder, and the process such as demodulation, decoding is carried out to the baseband signal received from described rf receiver unit, obtain the downlink data from described base station apparatus.
According to another aspect of the present invention, downlink data in a kind of terminal installation method of reseptance is also provided, based on the Modulation and Coding Scheme of being specified by base station apparatus, receive the data-signal from described base station apparatus, comprise the steps: the radiofrequency signal of the rf receiver unit reception in described terminal installation from described base station apparatus, and after being translated into baseband signal, send into the step of PDCCH reception unit and PDSCH receiving element, whether described PDCCH reception unit specifies this terminal installation can use the high order modulation configuration mark of high-order modulating according to the described base station apparatus of expression that this terminal installation stores, judge the length of the Downlink Control Information from described base station apparatus, length based on judged described Downlink Control Information is carried out PDCCH to the baseband signal received from described rf receiver unit and is detected trial, until successfully receive the Downlink Control Information that target is this terminal installation, and based on described Downlink Control Information, obtain the step of the Modulation and Coding Scheme that described base station apparatus uses, and described PDSCH receiving element determines the modulation system that described base station apparatus uses and chnnel coding code check according to the described Modulation and Coding Scheme that described PDCCH reception unit obtains, select suitable demodulator and decoder, and the process such as demodulation, decoding is carried out to the baseband signal received from described rf receiver unit, obtain the step of the downlink data from described base station apparatus.
Preferably, in above-mentioned downlink data receiving system or method, when described high order modulation configuration mark represents that described base station apparatus specifies this terminal installation can use described high-order modulating, the length of described Downlink Control Information is 6 bits; When described high order modulation configuration mark represents that described base station apparatus does not specify this terminal installation can use described high-order modulating, the length of described Downlink Control Information is 5 bits.
In addition preferably, in above-mentioned downlink data receiving system or method, described high-order modulating is be the modulation system of order of modulation at more than 256QAM.
Can support in the method and apparatus of high order modulation in employing, new MCS combination introduces extra bit, therefore more newly-increased projects in existing DCI format bit size form are all needed in base station and end side, because whether the MCS used during downlink transfer is based on 256QAM, bring new possibility can to the bit size of each defined DCI format.Therefore terminal needed the newly-increased step (step 2202 in such as Figure 22) judged the length of the Downlink Control Information from base station apparatus before receiving DCI, and the high order modulation configuration mark of definition in form 906 and form 2005, whether its effect " can use " high order modulation to indicate for each terminal exactly.According to the present invention, downlink data receiving system in terminal judges the length of Downlink Control Information based on this high order modulation configuration mark, and then the Downlink Control Information that can suitably receive based on expansion DCI format bitsize form, achieve the downlink transfer using high order modulation.
According to the present invention, owing to introducing the effective transmission technique based on high order modulation in physical layer, channel capacity can be utilized more fully, obtain better message transmission rate.Carry out the transmission of the configuration information of the CQI mapping form of terminal feedback by arranging high-rise link simultaneously, terminal is made a response to the change of channel quality in time, enhance feedback information to the coverage of channel quality while, ensure that the accuracy of feedback information and scheduling decision.Therefore, the performance of network can effectively be promoted.

Claims (16)

1. a base station apparatus, in a wireless communication system and between terminal installation, utilize the feedback information produced based on CQI form, determine Modulation and Coding Scheme, data-signal sent and receives, it is characterized in that, comprising:
Receiving element, receives the channel condition information comprising the CQI index representing channel quality from described terminal installation;
High-rise linking element, produce high-level signaling send signal and send to terminal installation, the channel condition information that this high-rise linking element receives according to described receiving element, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in described basic CQI mapping form,
Information collection unit, CQI index-mapping is Signal to Interference plus Noise Ratio information by the basic CQI mapping form for terminal installation specified by described high-rise linking element or expansion CQI mapping form;
Scheduling unit, according to the Signal to Interference plus Noise Ratio information that described information collection unit maps, carries out channel resource allocation to terminal installation and selects Modulation and Coding Scheme; And
Transmitting element, according to resource allocation result and the Modulation and Coding Scheme selection result of described scheduling unit, generates downstream transmission signals and sends to described terminal installation.
2. base station apparatus as claimed in claim 1, is characterized in that,
Described terminal installation is configured at least one CSI feedback object, and described CSI feedback is to liking terminal installation different channels state information reference signals CSI-RS in a network environment and the combination of channel condition information interferometry CSI-IM resource;
Described high-rise linking element, for each CSI feedback object of described terminal installation, specifies the CQI form used to be basic CQI mapping form or expansion CQI mapping form;
CQI index-mapping is Signal to Interference plus Noise Ratio information for each CSI feedback object of terminal installation by described information collection unit;
Described scheduling unit, based on signal source and the disturbance regime of terminal installation, determine corresponding CSI feedback object, according to the Signal to Interference plus Noise Ratio information that described information collection unit maps for the corresponding CSI feedback object of terminal installation, channel resource allocation is carried out to terminal installation and selects Modulation and Coding Scheme.
3. base station apparatus as claimed in claim 2, is characterized in that,
The CSI feedback object of terminal installation is current use basic CQI mapping form time,
When described high-rise linking element judges that current downlink transmission block is dispatched based on CQI value whether equal in basic CQI mapping form CQI maximum, and whether the transfer rate of the MCS used during this downlink transfer Bulk transport is more than or equal to the transfer rate corresponding to CQI maximum of basic CQI mapping form
If these two results judged are and are, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation.
4. base station apparatus as claimed in claim 3, is characterized in that,
Each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value;
When described two judge results be, the described ACK/NACK information that described high-rise linking element receives according to described receiving element is further that NACK or ACK is to accumulation bias S offsetupgrade, and judge to employ the high order modulation mapping thresholding T corresponding to CQI that transfer rate is minimum simultaneously in described expansion CQI mapping form high, whether be less than the mapping thresholding T corresponding to CQI maximum in basic CQI mapping form lowwith the described accumulation bias S after renewal offsetsum, if T high<T low+ S offset, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation,
Described accumulation bias S offsetinitial value be 0dB,
If described ACK/NACK information is ACK, then described accumulation bias S offsetbe updated to S offset=S offset+ Step up, wherein Step upfor receiving stepping skew during information Successful transmissions,
If described ACK/NACK information is NACK, then described accumulation bias S offsetbe updated to S offset=S offset-Step down, wherein Step downstepping skew during transmission unsuccessful for information,
Step upand Step downbe respectively the fixed value within the scope of 0.04dB ~ 0.2dB and 0.4dB ~ 1dB.
5. base station apparatus as claimed in claim 3, is characterized in that,
Described high-rise linking element, before carrying out described two judgements, first judging whether current downlink transmission block is first transmission, when being first transmission, then carrying out described two judgements.
6. base station apparatus as claimed in claim 2, is characterized in that,
Each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value;
The CSI feedback object of terminal installation current use expansion CQI mapping form time,
When described high-rise linking element judges that current downlink transmission block is dispatched based on CQI value whether be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, according to judged result to accumulation bias K offsetupgrade, and judge the mapping thresholding TH in basic CQI mapping form corresponding to CQI maximum lowwhether be greater than in expansion CQI mapping form and employ the high order modulation mapping thresholding TH corresponding to CQI that transfer rate is minimum simultaneously highk is offset with the accumulation after upgrading offsetsum, if TH low>TH high+ k offset, then basic CQI mapping form is specified to this CSI feedback object of this terminal installation,
Described accumulation bias K offsetinitial value is 0dB,
If when being judged as that described current downlink transmission block is dispatched based on CQI value be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset+ R up, wherein this R upfor receiving the stepping deviant during CQI using high order modulation, the product that the difference of the minimum CQI of high-order modulating is multiplied by the 1st setting is used to decide according to reporting in CQI and expansion CQI mapping form,
If when being judged as that described current downlink transmission block is dispatched based on CQI value be less than the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset-R down, wherein this R downfor receiving the stepping deviant during CQI of non-usage high order modulation, using the minimum CQI of high-order modulating according in expansion CQI mapping form and reporting the product that the difference of CQI is multiplied by the 2nd setting to determine,
Described 1st setting and described 2nd setting are be greater than 0 arbitrary value being less than 1, and described 2nd setting is less than described 1st setting.
7. the base station apparatus according to any one of claim 1 ~ 6, is characterized in that,
CQI index number in described basic CQI mapping form is identical with the CQI index number in described expansion CQI indexed table.
8. the base station apparatus according to any one of claim 1 ~ 6, is characterized in that,
Modulation system in described basic CQI mapping form comprises QPSK, 16QAM, 64QAM, and described high-order modulating is the modulation system of order of modulation at more than 256QAM.
9. the data communications method in a wireless communication system, utilize the feedback information produced based on CQI form between base station apparatus and terminal installation, determine Modulation and Coding Scheme, data-signal is sent and receives, it is characterized in that, this data communications method comprises the steps:
Receiving step, described base station apparatus receives the channel condition information comprising the CQI index representing channel quality from described terminal installation;
High-rise link step, described base station apparatus produces high-level signaling and sends signal and send to terminal installation, described base station apparatus is also according to the channel condition information that described receiving step receives, sending at described high-level signaling the CQI form used described terminal installation in signal is that basic CQI mapping form or expansion CQI mapping form are specified, wherein said basic CQI mapping form defines the corresponding relation between described CQI index and modulation system and code check, the corresponding relation that described expansion CQI mapping form defines described CQI index and expands between modulation system and code check, described expansion modulation system comprises modulation system in described basic CQI mapping form and the order of modulation high-order modulating higher than the modulation system in described basic CQI mapping form,
Information gathering procedure, CQI index-mapping is Signal to Interference plus Noise Ratio information by the basic CQI mapping form for terminal installation of described base station apparatus specified by described high-rise link step or expansion CQI mapping form;
Scheduling steps, the Signal to Interference plus Noise Ratio information that described base station apparatus maps according to described information gathering procedure, carries out channel resource allocation to terminal installation and selects Modulation and Coding Scheme; And
Forwarding step, described base station apparatus, according to the resource allocation result of described scheduling steps and Modulation and Coding Scheme selection result, generates downstream transmission signals and sends to described terminal installation.
10. data communications method as claimed in claim 9, is characterized in that,
Described terminal installation is configured at least one CSI feedback object, and described CSI feedback is to liking terminal installation different channels state information reference signals CSI-RS in a network environment and the combination of channel condition information interferometry CSI-IM resource;
In described high-rise link step, for each CSI feedback object of described terminal installation, the CQI form used is specified to be basic CQI mapping form or expansion CQI mapping form;
In described information gathering procedure, be Signal to Interference plus Noise Ratio information for each CSI feedback object of terminal installation by CQI index-mapping;
In described scheduling steps, based on signal source and the disturbance regime of terminal installation, determine corresponding CSI feedback object, according to the Signal to Interference plus Noise Ratio information that described information gathering procedure maps for the corresponding CSI feedback object of terminal installation, channel resource allocation is carried out to terminal installation and selects Modulation and Coding Scheme.
11. data communications methods as claimed in claim 10, is characterized in that,
The CSI feedback object of terminal installation is current use basic CQI mapping form time,
When described high-rise link step judges that current downlink transmission block is dispatched based on CQI value whether equal in basic CQI mapping form CQI maximum, and whether the transfer rate of the MCS used during this downlink transfer Bulk transport is more than or equal to the transfer rate corresponding to CQI maximum of basic CQI mapping form
If these two results judged are and are, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation.
12. data communications methods as claimed in claim 11, is characterized in that,
Each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value;
When described two judge results be, the described ACK/NACK information that described high-rise link step receives according to described receiving step is further that NACK or ACK is to accumulation bias S offsetupgrade, and judge to employ the high order modulation mapping thresholding T corresponding to CQI that transfer rate is minimum simultaneously in described expansion CQI mapping form high, whether be less than the mapping thresholding T corresponding to CQI maximum in basic CQI mapping form lowwith the described accumulation bias S after renewal offsetsum, if T high<T low+ S offset, then expansion CQI mapping form is specified to this CSI feedback object of this terminal installation,
Described accumulation bias S offsetinitial value be 0dB,
If described ACK/NACK information is ACK, then described accumulation bias S offsetbe updated to S offset=S offset+ Step up, wherein Step upfor receiving stepping skew during information Successful transmissions,
If described ACK/NACK information is NACK, then described accumulation bias S offsetbe updated to S offset=S offset-Step down, wherein Step downstepping skew during transmission unsuccessful for information,
Step upand Step downbe respectively the fixed value within the scope of 0.04dB ~ 0.2dB and 0.4dB ~ 1dB.
13. data communications methods as claimed in claim 11, is characterized in that,
In described high-rise link step, before carrying out described two judgements, first judging whether current downlink transmission block is first transmission, when being first transmission, then carrying out described two judgements.
14. data communications methods as claimed in claim 9, is characterized in that,
Each described CQI index corresponds respectively to mapping thresholding, and this mapping thresholding is the value reflecting man-to-man mapping ruler between CQI and SINR value;
The CSI feedback object of terminal installation current use expansion CQI mapping form time,
When described high-rise link step judges that current downlink transmission block is dispatched based on CQI value whether be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, according to judged result to accumulation bias K offsetupgrade, and judge the mapping thresholding TH in basic CQI mapping form corresponding to CQI maximum lowwhether be greater than in expansion CQI mapping form and employ the high order modulation mapping thresholding TH corresponding to CQI that transfer rate is minimum simultaneously highk is offset with the accumulation after upgrading offsetsum, if TH low>TH high+ k offset, then basic CQI mapping form is specified to this CSI feedback object of this terminal installation,
Described accumulation bias K offsetinitial value is 0dB,
If when being judged as that described current downlink transmission block is dispatched based on CQI value be more than or equal to the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset+ R up, wherein this R upfor receiving the stepping deviant during CQI using high order modulation, the product that the difference of the minimum CQI of high-order modulating is multiplied by the 1st setting is used to decide according to reporting in CQI and expansion CQI mapping form,
If when being judged as that described current downlink transmission block is dispatched based on CQI value be less than the CQI minimum value of the high-order modulating used in expansion CQI mapping form, then described accumulation bias K offsetbe updated to K offset=K offset-R down, wherein this R downfor receiving the stepping deviant during CQI of non-usage high order modulation, using the minimum CQI of high-order modulating according in expansion CQI mapping form and reporting the product that the difference of CQI is multiplied by the 2nd setting to determine,
Described 1st setting and described 2nd setting are be greater than 0 arbitrary value being less than 1, and described 2nd setting is less than described 1st setting.
15. data communications methods according to any one of claim 9 ~ 14, is characterized in that,
CQI index number in described basic CQI mapping form is identical with the CQI index number in described expansion CQI indexed table.
16. data communications methods according to any one of claim 9 ~ 14, is characterized in that,
Modulation system in described basic CQI mapping form comprises QPSK, 16QAM, 64QAM, and described high-order modulating is the modulation system of order of modulation at more than 256QAM.
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