WO2017166184A1 - 用于确定信道质量指示cqi索引的方法、用户设备和基站 - Google Patents

用于确定信道质量指示cqi索引的方法、用户设备和基站 Download PDF

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Publication number
WO2017166184A1
WO2017166184A1 PCT/CN2016/078028 CN2016078028W WO2017166184A1 WO 2017166184 A1 WO2017166184 A1 WO 2017166184A1 CN 2016078028 W CN2016078028 W CN 2016078028W WO 2017166184 A1 WO2017166184 A1 WO 2017166184A1
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Prior art keywords
index
channel
base station
cqi
difference
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PCT/CN2016/078028
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English (en)
French (fr)
Inventor
董辰
孙彦良
王键
张莉莉
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2016/078028 priority Critical patent/WO2017166184A1/zh
Priority to US16/089,203 priority patent/US20200008104A1/en
Priority to CN201680083417.6A priority patent/CN108781384A/zh
Publication of WO2017166184A1 publication Critical patent/WO2017166184A1/zh

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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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H04L43/0888—Throughput
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H04L43/0894—Packet rate
    • 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
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters

Definitions

  • the present invention relates to the field of communications, and more particularly to a method, user equipment and base station for determining a channel quality indication CQI index.
  • CQI channel quality indicator
  • the modulation mode is given in the TS12.213 of the R12 version of the 3GPP protocol.
  • the CQI index number is 0-15 (CQI).
  • modulation methods are QPSK, 16QAM and 64QAM, the transmission rate range is 0-5.5547.
  • the UE when the user equipment (UE) communicates with the base station, the UE detects the channel quality and calculates the instantaneous transmission rate m supported by the channel, and then determines that it is less than or equal to m and closest to m according to Table 1.
  • the CQI index corresponding to the rate is fed back to the base station, and after receiving the CQI index fed back by the UE, the base station determines the modulation mode and the transmission rate corresponding to the CQI index, and then uses the corresponding modulation mode and transmission.
  • the rate transmits data to the UE.
  • the UE In the prior art, the UE generally feeds back a CQI index to a base station periodically (for example, with a period of 10 ms), and the base station determines, according to the received CQI index, which modulation mode and how much transmission rate is used to transmit data to the UE.
  • the main problem in the prior art is that the UE occupies more channel resources when reporting the CQI index to the base station periodically, and the signaling overhead is large.
  • the present application provides a method, user equipment, and base station for determining a CQI index to reduce overhead of control signaling.
  • a method for determining a CQI index comprising: determining, by a user equipment UE, a quality of a channel between the UE and the base station; and transmitting, by the UE, to a base station according to a quality of the channel
  • An index the first index is a CQI index corresponding to an average transmission rate supported by the channel
  • the UE sends an index difference to the base station according to a quality of the channel, so that Determining, by the base station, the second index according to the first index and the index difference; wherein the index difference is used to indicate a difference between the first index and the second index, where the second index is The CQI index corresponding to the instantaneous transmission rate supported by the channel, the period in which the UE sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the bit occupied by the first index number.
  • the base station may determine, according to the first index and the index difference, a CQI index corresponding to a channel between the base station and the UE, that is, a second index, so that The base station determines the CQI index corresponding to the channel, and then the base station can determine the rate, the modulation mode, the code rate, and the like when transmitting data to the UE on the channel according to the CQI index.
  • the UE feeds back the channel quality to the base station by periodically feeding back the CQI index.
  • the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. Required signaling to reduce signaling overhead.
  • the UE sends the The first index.
  • the index difference occupies less than 4 bits.
  • a second aspect provides a method for determining a CQI index, including: receiving, by a base station, a first index sent by a user equipment UE, where the first index is an average transmission rate supported by a channel between the base station and the UE Corresponding CQI index; the base station receives an index difference value sent by the UE, where the index difference value is used to indicate a difference between the first index and the second index, and the second index is supported by the channel a CQI index corresponding to the instantaneous transmission rate, the period in which the UE sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index; Determining, according to the first index and the index difference, a CQI index corresponding to the channel.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. Signaling, reducing signaling overhead.
  • the method further includes: determining, by the base station, an instantaneous transmission rate supported by the channel according to a CQI index corresponding to the channel.
  • the index difference occupies less than 4 bits.
  • a user equipment comprising means for performing the method of the first aspect above.
  • a base station comprising means for performing the method of the second aspect above.
  • a user equipment comprising a memory, a processor, and a transceiver, the memory for storing a program, the processor and the transceiver are configured to perform when the program is executed The method on the one hand.
  • a base station comprising a memory, a transceiver, and a processor, the memory for storing a program, the transceiver and the processor for performing the second aspect when the program is executed The method in .
  • the first index and the index difference value are sent to the base station by using a physical uplink control channel PUCCH or a physical uplink shared channel (PUSCH).
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the UE obtains an average channel reception quality by averaging the received channel quality measured by the UE side in a period of time before the current time, and according to the foregoing, The average channel reception quality determines the average transmission rate supported by the channel.
  • the modulation schemes include QPSK, 16QAM, 64QAM, and 256QAM.
  • the sending period of the first index is a first period
  • the sending period of the index difference is a second period, where the first period is at least four times larger than the second period.
  • the period in which the first index is sent is between 1 ms and 100 s.
  • the period for transmitting the index difference is any one of 1TTI, 2TTI, 7TTI, 1ms, 2ms, 5ms, 10ms, 20ms, and 40ms, where the TTI is a transmission time interval. It should be understood that the period of the index difference may be other larger or smaller values.
  • the period of the first index may be a longer time interval, and the period of the first index may also be less than or equal to 1 ms, or may be greater than or equal to 100 s.
  • the number of antennas of the base station and the UE is greater than or equal to 1.
  • the number of antennas of the base station is 1-1024, and the number of antennas of the UE is 1-8.
  • the method is applicable to the case of any length of transmission time interval TTI.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. Signaling, reducing signaling overhead.
  • FIG. 1 is a schematic flowchart of a method for determining a CQI index according to an embodiment of the present invention.
  • FIG. 2 is a schematic block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 3 is a schematic block diagram of a base station according to an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a base station according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • the user equipment includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular"
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular"
  • the telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
  • the UE In the prior art, the UE generally measures the quality of the channel periodically, and obtains the instantaneous transmission rate supported by the channel. Then, the query table 1 determines the corresponding CQI index and feeds back the CQI index to the base station.
  • the quality of a channel is affected by two types of factors. Here we call it the large-scale feature and the small-scale feature of the channel.
  • the large-scale feature is the main factor determining the quality of the channel. It is mainly reflected in
  • the average received signal-to-noise ratio of the channel is determined by factors such as whether the transmitting antenna has a direct component, the distance between the transmitting antenna and the receiving antenna, and how many buildings the transmitting antenna needs to penetrate to reach the receiving antenna.
  • the first index and the index difference are fed back to the base station according to the large-scale features and the small-scale features of the channel, respectively.
  • the first index is fed back, the average transmission rate supported by the channel is obtained according to the large-scale feature of the channel, and then the query table 1 sends the CQI index corresponding to the average transmission rate as the first index to the base station, and when the feedback index difference is Obtaining an instantaneous transmission rate supported by the channel according to the large-scale feature and the small-scale feature of the channel, and then determining a difference between the second index corresponding to the instantaneous transmission rate and the first index, and then using the index difference to represent the second index and the first The difference of an index is fed back to the base station.
  • the first index can be fed back at a longer time interval, and the feedback period of the index difference is compared with the existing
  • the feedback period in the technology is the same, for example, the first index is fed back every 320 ms, and the index difference is fed back every 10 ms, since the index difference actually represents the difference between the two index values, and the second index and the first index
  • the difference is generally in the range of -4 to 3. Therefore, only 3 bits need to be occupied when the index difference is fed back, which saves signaling overhead compared with the prior art method of transmitting CQI index.
  • FIG. 1 is a schematic flowchart of a method for determining a CQI index according to an embodiment of the present invention. The steps of the method shown in Figure 1 are described in detail below.
  • the UE determines a quality of a channel between the UE and the base station.
  • the UE can average the received channel quality measured by the UE side in the previous period of time, so that the impact of the small-scale can be averaged, and then the remaining is the large-scale feature corresponding.
  • the average received signal-to-noise ratio can obtain the average transmission rate supported by the channel.
  • the comprehensive measurement of the large-scale features and the small-scale features can be obtained to obtain the instantaneous transmission rate supported by the channel.
  • the UE sends a first index to the base station according to the quality of the channel, where the first index is a CQI index corresponding to an average transmission rate supported by the channel between the UE and the base station.
  • the large-scale feature of the channel between the UE and the base station may be the average signal-to-noise ratio of the channel.
  • the average signal-to-noise ratio of the channel changes little during a period of time (such as 320ms to 100s), and the UE
  • the average signal-to-noise ratio can be calculated according to a certain formula to calculate the average transmission rate supported by the channel, and then the CQI corresponding to the supported average transmission rate of the channel can be determined according to Table 1. Indexing, and feeding the CQI index as a first index to the base station.
  • the first index substantially reflects the large-scale feature of the channel. Since the large-scale feature changes slowly, the first index can be fed back to the base station in the T period, and the time range of T can be 320 ms to 100 seconds. In addition, when the first index is fed back, the periodic transmission may not be adopted, but the first index is fed back to the base station in a triggered manner, for example, when the average quality of the channel changes or the average quality changes exceed a preset threshold. Sending the first index to the base station again, that is, the UE sends the first index to the base station again after the average rate of channel support between the UE and the base station changes or changes exceeds the set threshold, otherwise the UE does not send the first index to the base station again. An index. It should also be understood that the first index sent by the UE reflects the average transmission rate currently supported by the channel.
  • the UE sends an index difference value to the base station according to the quality of the channel, where the index difference value is used to indicate a difference between the first index and the second index, and the second index is the channel.
  • the CQI index corresponding to the supported instant transmission rate, the period in which the UE sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index.
  • the period in which the UE sends the first index may be 320 ms, and the period in which the index difference is sent may be 10 ms.
  • the number of bits occupied by the first index may be 4 bits, and the number of bits occupied by the index difference is less than 4 bits.
  • the first index occupies 4 bits, and the index difference occupies 3 bits.
  • the base station may determine the instantaneous transmission rate supported by the channel according to the first index and the index difference. Specifically, the base station may first determine the second index (that is, the CQI index corresponding to the channel) according to the first index and the index difference, and then determine the instantaneous transmission rate supported by the channel according to the second index.
  • the second index that is, the CQI index corresponding to the channel
  • the base station when the first index is 6, and the index difference is 3, the base station first obtains a second index of 9 according to the first index and the index difference, and then queries Table 1, and determines that the instantaneous transmission rate supported by the channel is 2.4063, and the modulation mode is For 16QAM.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. The required signaling reduces the signaling overhead.
  • the method for determining a CQI index in the embodiment of the present invention can be applied to a specific antenna configuration scenario.
  • the method of determining the CQI index is described in detail.
  • Table 2 shows the correspondence between the index difference and the difference between the first index and the second index. As can be seen from Table 2, when the difference between the first index and the second index is 0, 1, 2, The value of the index difference is equal to the difference between the first index and the second index, and when the difference between the first index and the second index is other than 0, 1, 2, the index difference is There is a correspondence between the difference between the first index and the second index. In essence, Table 2 only gives a form in which the index difference represents the correspondence between the difference between the first index and the second index, and the index difference may also be in other forms to represent the first index and the second index. Difference.
  • the specific steps for the UE to feed back the first index and the index difference to the base station to determine the instantaneous transmission rate supported by the channel and the corresponding modulation mode and code rate according to the first index and the index difference fed back by the UE are as follows:
  • the UE determines, according to the average received signal-to-noise ratio of the channel, that the average rate supported by the channel is 1.41. According to Table 1, the UE selects the rate 1.1758 that is closest to the rate 1.41 and is less than the rate 1.41, and uses the CQI index 6 corresponding to 1.1758 as the first index. And feeding back the first index to the base station;
  • the UE obtains an instantaneous transmission rate 2.01 supported by the channel according to the instantaneous quality of the channel. According to Table 1, select a rate 1.9141 that is closest to the rate 2.01 and smaller than the rate 2.01, and determine that the second index corresponding to 1.9141 is 8, and the second index is The difference from the first index is 2, and then the table 2 is queried, and the index difference is determined according to the correspondence between the difference and the index difference, and then the index difference is fed back to the base station;
  • the base station receives the first index and the index difference.
  • the base station determines, according to the index difference, that the difference between the first index and the second index is 2, and then determines that the second index is 8 according to the first index, and then the query table 1 determines that the transmission rate corresponding to the second index 8 is 1.9141.
  • the modulation mode is 16QAM, and the code rate is 490.
  • the base station determines the instantaneous transmission rate supported by the channel between the UE and the base station, the supported modulation mode, and the code rate.
  • the base station transmits data to the UE according to the instantaneous transmission rate supported by the channel acquired in step 304, the supported modulation mode, and the code rate.
  • the following uses a specific example to compare how many bits are used in the embodiment of the present invention to feed back CQI compared with the prior art.
  • the UE feeds back CQI to the base station every 10 ms.
  • the number of bits occupied by the CQI in the prior art and the embodiment of the present invention is measured by the length of time of 320 ms.
  • the number of bits occupied by the CQI of the feedback channel is 4 bits, and the CQI of the channel is fed back to the base station every 10 ms.
  • the method for determining the CQI index in the embodiment of the present invention reduces the number of bits used for feedback CQI in 320 ms compared with 28 bits in the prior art, that is, the embodiment of the present invention saves certain control signaling from the prior art.
  • the first index when determining the first index, in addition to according to Table 1, the first index may be determined according to Table 3.
  • Table 3 is in the 3gpp protocol as the communication rate is higher and higher.
  • Table 3 contains a wider range of rates than Table 4.
  • Table 1 or Table 3 can be selected according to the actual situation.
  • FIG. 2 is a schematic structural diagram of a user equipment 200 according to an embodiment of the present invention.
  • the user equipment 200 includes:
  • a determining module 210 configured to determine a quality of a channel between the user equipment 200 and the base station;
  • the sending module 220 is configured to send, to the base station, a first index according to the quality of the channel, where the first index is a CQI index corresponding to an average transmission rate supported by the channel;
  • the sending module 220 is further configured to: after sending the first index, send an index difference value to the base station according to the quality of the channel, so that the base station determines, according to the first index and the index difference value, a second index, where the index difference is used to indicate a difference between the first index and the second index, and the second index is a CQI index corresponding to an instantaneous transmission rate supported by the channel,
  • the period in which the user equipment 200 sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. The required signaling reduces the signaling overhead.
  • the sending module 220 is further configured to: after the change of the average rate of channel support between the user equipment 200 and the base station exceeds a set threshold, the sending module 220 sends the base station to the base station again.
  • the first index is further configured to: after the change of the average rate of channel support between the user equipment 200 and the base station exceeds a set threshold, the sending module 220 sends the base station to the base station again.
  • the index difference occupies less than 4 bits.
  • FIG. 3 is a schematic structural diagram of a base station 300 according to an embodiment of the present invention.
  • the base station 300 includes:
  • the receiving module 310 is configured to receive a first index sent by the user equipment UE, where the first index is a CQI index corresponding to an average transmission rate supported by the channel between the base station and the UE;
  • the receiving module 310 is further configured to receive an index difference value sent by the UE, where the index difference value is used to indicate a difference between the first index and a second index, and the second index is the channel
  • the CQI index corresponding to the supported instant transmission rate, the period in which the UE sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index;
  • the determining module 320 is configured to determine, according to the first index and the index difference, a CQI index corresponding to the channel.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. The required signaling reduces the signaling overhead.
  • the determining module 320 is further configured to: determine, according to the CQI index corresponding to the channel, an instantaneous transmission rate supported by the channel.
  • the index difference occupies less than 4 bits.
  • FIG. 4 is a schematic structural diagram of a user equipment 400 according to an embodiment of the present invention.
  • the user equipment 400 includes:
  • a memory 410 configured to store a program
  • the processor 420 is configured to determine a quality of a channel between the user equipment 400 and the base station when the program is executed;
  • the transceiver 430 is configured to send, by the transceiver 430, a first index to the base station according to a quality of the channel, where the first index is an average transmission rate supported by the channel.
  • CQI index
  • the transceiver 430 is further configured to send an index difference value to the base station according to a quality of the channel after sending the first index, so that the base station determines according to the first index and the index difference value.
  • a second index where the index difference is used to indicate a difference between the first index and the second index, and the second index is a CQI index corresponding to an instantaneous transmission rate supported by the channel,
  • the period in which the user equipment 400 sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. The required signaling reduces the signaling overhead.
  • the processor 420 is specifically configured to: determine, according to the first index and the index difference, the second index; determine, according to the second index, the channel supported instant Transmission rate.
  • the index difference occupies less than 4 bits.
  • FIG. 5 is a schematic structural diagram of a base station 500 according to an embodiment of the present invention.
  • the base station 500 includes:
  • a memory 510 configured to store a program
  • the transceiver 520 is configured to receive a first index sent by the user equipment UE when the program is executed, where the first index is an average transmission rate supported by the channel between the base station 500 and the UE.
  • the first index is an average transmission rate supported by the channel between the base station 500 and the UE.
  • the transceiver 520 is further configured to receive an index difference value sent by the UE, where the index difference value is used to indicate a difference between the first index and a second index, and the second index is the channel
  • the CQI index corresponding to the supported instant transmission rate, the period in which the UE sends the first index is greater than the period in which the index difference is sent, and the number of bits occupied by the index difference is smaller than the number of bits occupied by the first index;
  • the processor 530 is configured to determine, according to the first index and the index difference value, a CQI index corresponding to the channel, when the program is executed.
  • the UE when the channel quality needs to be fed back to the base station, the UE feeds back the CQI index (ie, the first index) and the index difference value to the base station. Since the number of bits occupied by the index difference is small, the feedback CQI index can be saved. The required signaling reduces the signaling overhead.
  • the processor 530 is further configured to: determine, according to the first index and the index difference, a CQI index corresponding to the channel.
  • the index difference occupies less than 4 bits.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, may be located in one place. Or it can be distributed to multiple network elements. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明实施例提供一种用于确定信道质量指示CQI索引的方法、用户设备和基站。该方法包括：用户设备UE确定UE与基站之间的信道的质量；UE根据信道的质量向基站发送第一索引，第一索引为信道支持的平均传输速率对应的CQI索引；UE根据信道的质量向基站发送索引差值，其中，索引差值用于表示第一索引与第二索引的差值，第二索引为信道支持的即时传输速率对应的CQI索引，UE发送第一索引的周期大于发送索引差值的周期，索引差值占用的比特数小于第一索引占用的比特数。本发明实施例能够降低传输CQI时的信令开销，减少对信道资源的占用。

Description

用于确定信道质量指示CQI索引的方法、用户设备和基站 技术领域
本发明涉及通信领域，并且更为具体地，涉及一种用于确定信道质量指示CQI索引的方法、用户设备和基站。
背景技术
3GPP协议中R12版本的TS36.213中给出了信道质量指示(Channel Quality Indicator，CQI)与调制方式、传输速率的对应关系表，如表1所示，CQI的索引号为0-15(CQI占用4bit，共有16个档位)，调制方式有QPSK、16QAM以及64QAM，传输速率范围为0-5.5547。
表1 CQI与调制方式、码率以及速率的对应关系
CQI 调制方式 码率×1024 速率
0 ——— ——— ———
1 QPSK 78 0.1523
2 QPSK 120 0.2344
3 QPSK 193 0.377
4 QPSK 308 0.6016
5 QPSK 449 0.877
6 QPSK 602 1.1758
7 16QAM 378 1.4766
8 16QAM 490 1.9141
9 16QAM 616 2.4063
10 64QAM 466 2.7305
11 64QAM 567 3.3223
12 64QAM 666 3.9023
13 64QAM 772 4.5234
14 64QAM 873 5.1152
15 64QAM 948 5.5547
在现有技术中，用户设备(User Equipment，UE)和基站之间通信时，UE会检测信道质量并折算出信道支持的即时传输速率m，然后根据表1确定小于等于m并且与m最接近的速率对应的CQI索引并将该CQI索引反馈给基站，基站在接收到UE反馈的CQI索引之后，查询表1确定与该CQI索引对应的调制方式和传输速率，然后以相应的调制方式和传输速率向UE传输数据。具体来说，如果UE检测到信道支持的即时传输速率为0.8，表1中与速率0.8最接近的两个速率分别是CQI索引为4对应的速率0.6016，CQI索引为5时对应的速率0.877，由于在反馈时只能采用就低不就高的原则， 因此，UE将CQI索引＝4反馈给基站，基站在接收到UE发送的CQI索引之后，根据表1确定与CQI索引＝4对应的速率为0.6016，调制方式为QPSK，然后基站采用QPSK的调制方式并以0.6016的速率向UE发送数据。在现有技术中，UE一般是周期性(例如以10ms为一个周期)的向基站反馈CQI索引，基站根据收到的CQI索引确定以哪种调制方式以及多大的传输速率向UE发送数据。现有技术中的主要问题是UE在周期性地向基站反馈CQI索引时占用了较多的信道资源，信令开销较多。
发明内容
本申请提供一种用于确定CQI索引的方法、用户设备和基站，以减少控制信令的开销。
第一方面，提供一种用于确定CQI索引的方法，包括：用户设备UE确定所述UE与所述基站之间的信道的质量；所述UE根据所述信道的质量向所述基站发送第一索引，所述第一索引为所述信道支持的平均传输速率对应的CQI索引；所述UE在发送所述第一索引之后根据所述信道的质量向所述基站发送索引差值，以使所述基站根据所述第一索引和所述索引差值，确定第二索引；其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
应理解，基站在接收到上述UE发送的第一索引和索引差值后就可以根据第一索引和索引差值确定基站与UE之间的信道对应的CQI索引，也就是第二索引，这样，基站就确定了信道对应的CQI索引，接下来基站就可以根据该CQI索引确定在信道上向UE发送数据时的速率、调制方式以及码率等。
现有技术中，UE通过周期性反馈CQI索引向基站反馈信道质量。而本申请中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
结合第一方面，在第一方面的第一种实现方式中，当所述UE与所述基站之间的信道支持的平均速率的变化超过设定阈值后，所述UE再次向基站发送所述第一索引。
结合第一方面或者第一方面的第一种实现方式，在第一方面的第二种实现方式中，所述索引差值占用的比特数小于4比特。
第二方面，提供一种用于确定CQI索引的方法，包括：基站接收用户设备UE发送的第一索引，所述第一索引为所述基站和所述UE之间的信道支持的平均传输速率对应的CQI索引；所述基站接收所述UE发送的索引差值，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数；所述基站根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
本申请中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
结合第二方面，在第二方面的第一种实现方式中，所述方法还包括：所述基站根据所述信道对应的CQI索引确定所述信道支持的即时传输速率。
结合第二方面或者第二方面的第一种方式，在第二方面的第二种方式中，所述索引差值占用的比特数小于4比特。
第三方面，提供一种用户设备，所述用户设备包括执行上述第一方面中的方法的模块。
第四方面，提供一种基站，所述基站包括执行上述第二方面中的方法的模块。
第五方面，提供一种用户设备，所述用户设备包括存储器、处理器和收发器，所述存储器用于存储程序，当所述程序被执行时所述处理器和所述收发器用于执行第一方面中的方法。
第六方面，提供一种基站，所述基站包括存储器、收发器和处理器，所述存储器用于存储程序，当所述程序被执行时所述收发器和所述处理器用于执行第二方面中的方法。
在上述某些实现方式中，通过物理上行链路控制信道PUCCH或者物理上行共享信道PUSCH向基站发送所述第一索引和所述索引差值。
在上述某些实现方式中，所述UE通过对当前时刻之前的一段时间内所述UE侧测量到的接收信道质量求均值获得平均信道接收质量，并根据所述 平均信道接收质量确定所述信道支持的平均传输速率。
在上述某些实现方式中，所述调制方式包括QPSK、16QAM、64QAM以及256QAM。
在上述某些实现方式中，所述第一索引的发送周期为第一周期，所述索引差值的发送周期为第二周期，所述第一周期至少大于所述第二周期的4倍。
在上述某些实现方式中，发送所述第一索引的周期为1ms到100s之间。
在上述某些实现方式中，发送所述索引差值的周期为1TTI，2TTI，7TTI，1ms，2ms，5ms、10ms、20ms和40ms中的任意一种，其中，TTI是传输时间间隔。应理解，索引差值的周期可以为其它更大或者更小的数值。
应理解，第一索引的周期可以为一个较长的时间间隔，第一索引的周期也可以小于等于1ms，也可以大于等于100s。
在上述某些实现方式中，所述基站和所述UE的天线数量大于等于1。
在上述某些实现方式中，所述基站的天线数量为1-1024，所述UE的天线数量为1-8。
在上述某些实现方式中，所述方法适用于任何长度的传输时间间隔TTI的情况。
本申请中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例的用于确定CQI索引的方法的示意性流程图。
图2是本发明实施例的用户设备的示意性框图。
图3是本发明实施例的基站的示意性框图。
图4是本发明实施例的用户设备的示意性框图。
图5是本发明实施例的基站的示意性框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
应理解，本发明的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、5G等。
还应理解，在本发明实施例中，用户设备(User Equipment，UE)包括但不限于移动台(Mobile Station，MS)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、手机(handset)及便携设备(portable equipment)等，该用户设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，用户设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等，用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
现有技术中，UE一般是周期性的测量信道的质量，得出信道支持的即时传输速率，然后查询表1确定对应的CQI索引并将该CQI索引反馈给基站。一般来说，信道的质量好坏受到两类因素的影响，这里我们将其称之为信道的大尺度特征和小尺度特征，大尺度特征是决定信道质量好坏的主要因素，它主要反映在信道的平均接收信噪比上，它主要由发射天线是不是有直射分量，发射天线和接收天线的距离，以及发射天线发射出的信号需要穿透多少建筑物到达接收天线等因素决定，这些因素对信道质量有比较大的影响，但是，大尺度特征的变化是很缓慢的，在绝大多数的应用场景下，如果以320ms至100s的时间长度来衡量的话，那么信道的大尺度特征的变化是很小的。相对于大尺度特征来说小尺度特征是决定信道质量好坏比较次要的因素，它主要包括衰落和阴影效应等因素，这些因素变化比较快，因此，小尺度特征会导致信道质量一直在一个较小的范围内波动，其中波动的速度和 多普勒的频率有关，通常在1到10个毫秒级别。本发明实施例就是基于信道的上述特征，在反馈CQI的时候，考虑信道的大尺度特征和小尺度特征，分别根据信道的大尺度特征和小尺度特征向基站反馈第一索引和索引差值，在反馈第一索引时是根据信道的大尺度特征得出信道支持的平均传输速率，然后查询表1将平均传输速率对应的CQI索引作为第一索引发送给基站，而在反馈索引差值时是根据信道的大尺度特征和小尺度特征得出信道支持的即时传输速率，然后确定即时传输速率对应的第二索引与第一索引的差值，然后用索引差值来表示该第二索引与第一索引的差值，并将该索引差值反馈给基站。由于信道的大尺度特征变化很小，也就是说信道支持的平均传输速率的波动很小，那么可以以一个较长的时间间隔来反馈第一索引，而索引差值的反馈周期与与现有技术中的反馈周期一样，例如，每320ms反馈一次第一索引，每10ms反馈一次索引差值，由于索引差值实际上表示是两个索引值的差值，并且，第二索引与第一索引的差值一般是在-4～3的范围内，因此，在反馈索引差值时只需要占用3个比特，与现有技术传输CQI索引的方式相比，节省了信令开销。
下面结合具体的实施例对本发明的用于确定CQI索引的方法和装置进行详细的描述。
图1是本发明实施例的用于确定CQI索引的方法的示意性流程图。下面详细描述图1所示的方法的步骤。
110、UE确定该UE与基站之间的信道的质量。
具体来说，由于小尺度特征的均值为0，UE可以对此前一段时间内UE侧测量到的接收信道质量求均值，这样可以将小尺度的影响平均掉，那么剩下的就是大尺度特征对应的平均接收信噪比，然后再根据表1就可以得到信道支持的平均传输速率，最后对大尺度特征和小尺度特征综合进行衡量可以得到信道支持的即时传输速率。
120、UE根据信道的质量向基站发送第一索引，第一索引为UE与基站之间的信道支持的平均传输速率对应的CQI索引。
UE和基站之间的信道的大尺度特征可以是信道的平均信噪比，在大多数的应用场景下，信道的平均信噪比在一段时间内(比如320ms至100s)的变化很小，UE可以将平均信噪比按照一定的公式折算出信道支持的平均传输速率，然后可以根据表1确定信道的支持的平均传输速率对应的CQI 索引，并将该CQI索引作为第一索引反馈给基站。
应理解，第一索引实质上反映的是信道的大尺度特征，由于大尺度特征变化比较缓慢，因此可以在T周期内向基站反馈一次第一索引，T的时间范围可以是320ms到100秒。此外，在反馈第一索引时也可以不采用周期发送的方式，而是采用触发的方式向基站反馈第一索引，例如，当信道的平均质量发生变化或者平均质量的变化超过预设阈值时UE向基站再次发送第一索引，也就是说当UE与基站之间的信道支持的平均速率的发生变化或者变化超过设定阈值后UE再次向基站发送第一索引，否则UE不向基站再次发送第一索引。还应理解，UE发送的第一索引反映的都是信道当前支持的平均传输速率。
130、UE根据所述信道的质量向所述基站发送索引差值，其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
具体来说，UE发送第一索引的周期可以为320ms，发送索引差值的周期可以为10ms。上述第一索引占用的比特数可以为4比特，而索引差值占用的比特数小于4比特，优选地，第一索引占用4比特，索引差值占用3比特。
基站在接收到第一索引和索引差值后，可以根据第一索引和索引差值确定信道支持的即时传输速率。具体来说，基站可以先根据第一索引和索引差值确定所述第二索引(也就是信道对应的CQI索引)，然后再根据第二索引确定信道支持的即时传输速率。
例如，当第一索引为6，索引差值为3时，基站先根据第一索引和索引差值得到第二索引为9，然后查询表1，确定信道支持的即时传输速率为2.4063，调制方式为16QAM。
本发明实施例中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
本发明实施例的用于确定CQI索引的方法可以应用到一个具体的天线配置的场景，下面以RI＝1为例并结合表1和表2对本发明实施例的用于确 定CQI索引的方法进行详细的介绍。其中，表2示出了索引差值与第一索引和第二索引的差的对应关系，由表2可以看出，当第一索引与第二索引的差值为0，1，2时，索引差值的数值与第一索引和第二索引的差值时相等的，而当第一索引与第二索引的差值为除了0，1，2之外的其它数值时，索引差值与第一索引与第二索引的差值有一个对应关系。实质上，表2只是给出了一种索引差值表示第一索引与第二索引的差值的对应关系的形式，索引差值还可以采用其它的形式来表示第一索引与第二索引的差值。
表2索引差值与第一索引和第二索引的差值的对应关系
索引差值 第一索引和第二索引的差值
0 0
1 1
2 2
3 ≥3
4 ≤-4
5 -3
6 -2
7 -1
从UE向基站反馈第一索引和索引差值到基站根据UE反馈的第一索引和索引差值确定信道支持的即时传输速率以及对应的调制方式和码率的具体步骤如下：
201、UE根据信道的平均接收信噪比确定信道支持的平均速率为1.41，UE根据表1，选择与速率1.41最接近且小于速率1.41的速率1.1758，将1.1758对应的CQI索引6作为第一索引，并将该第一索引反馈给基站；
202、UE根据信道的即时质量得到信道支持的即时传输速率2.01，根据表1，选择与速率2.01最接近且小于速率2.01的速率1.9141，并确定1.9141对应的第二索引为8，将第二索引与第一索引做差得到差值为2，然后查询表2，根据差值与索引差值的对应关系确定索引差值为2，然后将该索引差值反馈给基站；
203、基站在接收第一索引和索引差值；
204、基站根据索引差值确定第一索引和第二索引的差值为2，然后再根据第一索引确定第二索引为8，然后查询表1确定第二索引8对应的传输速率为1.9141，调制方式为16QAM，码率为490，这样，基站就确定了UE和基站之间信道支持的即时传输速率，支持的调制方式以及码率。
205、基站根据步骤304中获取的信道支持的即时传输速率，支持的调制方式以及码率向UE传输数据。
具体而言，下面结合具体的实例比较一下本发明实施例与现有技术相比各使用了多少bit来反馈CQI。假设某通信系统使用3GPP R12标准，UE每10ms向基站反馈一次CQI，系统天线配置为8×2，基站侧8，UE侧2，平均接收信噪比为10.6dB，也就是avgSNR＝8e6。这里以320ms的时间长度来衡量现有技术和本发明实施例发送CQI所占用的比特数，现有技术中反馈信道的CQI占用的比特数为4bit，每10ms向基站反馈一次信道的CQI，在320ms的时间内共要反馈32次，因此，现有技术在320ms内反馈CQI累计使用4×32＝128bit信息。而在本发明实施例中，在320ms时间内只需要反馈一次第一索引，第一索引占4bit，每10ms反馈一次索引差值，索引差值占用3bit，，这样在320ms内反馈CQI累计使用3×32+4＝100bit信息。因此，本发明实施例用于确定CQI索引的方法在320ms内反馈CQI使用的比特数比现有技术中少28bit也就是说本发明实施例与现有技术相节省了一定的控制信令。
应理解，在本发明实施例中，确定第一索引时除了根据表1之外，还可以根据表3来确定第一索引，表3是随着通信速率的越来越高而在3gpp协议中新增加的一个表格，表3包含的速率的范围比表4更广，在确定第一索引时可以根据实际情况选择使用表1或者表3。
表3 CQI与调制方式、码率以及速率的对应关系
CQI 调制方式 码率×1024 速率
0 ——— ——— ———
1 QPSK 78 0.1523
2 QPSK 193 0.377
3 QPSK 449 0.877
4 16QAM 378 1.4766
5 16QAM 490 1.9141
6 16QAM 616 2.4063
7 64QAM 466 2.7305
8 64QAM 567 3.3223
9 64QAM 666 3.9023
10 64QAM 772 4.5234
11 64QAM 873 5.1152
12 256QAM 711 5.5547
13 256QAM 797 6.2266
14 256QAM 885 6.9141
15 256QAM 948 7.4063
上文结合图1和图2以及表1、表2和表3详细介绍了本发明实施例的 用于确定CQI索引的方法，下面结合图2至图5对本发明实施例的用户设备和基站进行介绍，应理解，图2至图5中的用户设备和基站能够实现上文中用于确定CQI索引的方法中的各个步骤，为了简洁，适当省略重复的描述。
图2是本发明实施例的用户设备200的示意性结构图。该用户设备200包括：
确定模块210，用于确定用户设备200与基站之间的信道的质量；
发送模块220，用于根据所述信道的质量向所述基站发送第一索引，所述第一索引为所述信道支持的平均传输速率对应的CQI索引；
所述发送模块220还用于在发送所述第一索引之后根据所述信道的质量向所述基站发送索引差值，以使所述基站根据所述第一索引和所述索引差值，确定第二索引；其中，所述索引差值用于表示所述第一索引与所述第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述用户设备200发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
本发明实施例中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
可选地，作为一个实施例，所述发送模块220还用于在所述用户设备200与所述基站之间的信道支持的平均速率的变化超过设定阈值后，发送模块220再次向基站发送所述第一索引。
可选地，作为一个实施例，所述索引差值占用的比特数小于4比特。
图3是本发明实施例的基站300的示意性结构图。该基站300包括：
接收模块310，用于接收用户设备UE发送的第一索引，所述第一索引为所述基站和所述UE之间的信道支持的平均传输速率对应的CQI索引；
所述接收模块310还用于接收所述UE发送的索引差值，其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数；
确定模块320，用于根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
本发明实施例中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
可选地，作为一个实施例，所述确定模块320还用于：根据所述信道对应的CQI索引确定所述信道支持的即时传输速率。
可选地，作为一个实施例，所述索引差值占用的比特数小于4比特。
图4是本发明实施例的用户设备400的示意性结构图。该用户设备400包括：
存储器410，用于存储程序；
处理器420，当所述程序被执行时，所述处理器420用于确定用户设备400与基站之间的信道的质量；
收发器430，当所述程序被执行时，所述收发器430用于根据所述信道的质量向所述基站发送第一索引，所述第一索引为所述信道支持的平均传输速率对应的CQI索引；
所述收发器430还用于在发送所述第一索引之后根据所述信道的质量向所述基站发送索引差值，以使所述基站根据所述第一索引和所述索引差值，确定第二索引；其中，所述索引差值用于表示所述第一索引与所述第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述用户设备400发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
本发明实施例中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
可选地，作为一个实施例，所述处理器420具体用于：根据所述第一索引和所述索引差值确定所述第二索引；根据所述第二索引确定所述信道支持的即时传输速率。
可选地，作为一个实施例，所述索引差值占用的比特数小于4比特。
图5是本发明实施例的基站500的示意性结构图。该基站500包括：
存储器510，用于存储程序；
收发器520，当所述程序被执行时，用于接收用户设备UE发送的第一索引，所述第一索引为基站500和所述UE之间的信道支持的平均传输速率 对应的CQI索引；
所述收发器520还用于接收所述UE发送的索引差值，其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数；
处理器530，当所述程序被执行时，所述处理器530用于根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
本发明实施例中，在需要向基站反馈信道质量时，UE向基站反馈的是CQI索引(即第一索引)以及索引差值，由于索引差值占用的比特数较小，可以节省反馈CQI索引所需的信令，降低信令开销。
可选地，作为一个实施例，所述处理器530还用于：根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
可选地，作为一个实施例，所述索引差值占用的比特数小于4比特。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方， 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (12)

  1. 一种用于确定信道质量指示CQI索引的方法，其特征在于，包括：
    用户设备UE确定所述UE与所述基站之间的信道的质量；
    所述UE根据所述信道的质量向所述基站发送第一索引，所述第一索引为所述信道支持的平均传输速率对应的CQI索引；
    所述UE在发送所述第一索引之后根据所述信道的质量向所述基站发送索引差值，以使所述基站根据所述第一索引和所述索引差值，确定第二索引；
    其中，所述索引差值用于表示所述第一索引与所述第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
  2. 如权利要求1所述的方法，其特征在于，当所述UE与所述基站之间的信道支持的平均速率的变化超过设定阈值后，所述UE再次向基站发送所述第一索引。
  3. 如权利要求1或2所述的方法，其特征在于，所述索引差值占用的比特数小于4比特。
  4. 一种用于确定信道质量指示CQI索引的方法，其特征在于，包括：
    基站接收用户设备UE发送的第一索引，所述第一索引为所述基站和所述UE之间的信道支持的平均传输速率对应的CQI索引；
    所述基站接收所述UE发送的索引差值，其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数；
    所述基站根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
  5. 如权利要求4所述的方法，其特征在于，所述方法还包括：
    所述基站根据所述信道对应的CQI索引确定所述信道支持的即时传输速率。
  6. 如权利要求4或5所述的方法，其特征在于，所述索引差值占用的比特数小于4比特。
  7. 一种用户设备，其特征在于，包括：
    确定模块，用于确定所述UE与所述基站之间的信道的质量；
    发送模块，用于根据所述信道的质量向所述基站发送第一索引，所述第一索引为所述信道支持的平均传输速率对应的CQI索引；
    所述发送模块还用于在发送所述第一索引之后根据所述信道的质量向所述基站发送索引差值，以使所述基站根据所述第一索引和所述索引差值，确定第二索引；
    其中，所述索引差值用于表示所述第一索引与所述第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数。
  8. 如权利要求7所述的用户设备，其特征在于，所述发送模块还用于：
    当所述UE与所述基站之间的信道支持的平均速率的变化超过设定阈值后，再次向基站发送所述第一索引。
  9. 如权利要求要求7或8所述的用户设备，其特征在于，所述索引差值占用的比特数小于4比特。
  10. 一种基站，其特征在于，包括：
    接收模块，用于接收用户设备UE发送的第一索引，所述第一索引为所述基站和所述UE之间的信道支持的平均传输速率对应的CQI索引；
    所述接收模块还用于接收所述UE发送的索引差值，其中，所述索引差值用于表示所述第一索引与第二索引的差值，所述第二索引为所述信道支持的即时传输速率对应的CQI索引，所述UE发送第一索引的周期大于发送所述索引差值的周期，所述索引差值占用的比特数小于所述第一索引占用的比特数；
    确定模块，用于根据所述第一索引和所述索引差值确定所述信道对应的CQI索引。
  11. 如权利要求10所述的基站，其特征在于，所述确定模块还用于：
    根据所述信道对应的CQI索引确定所述信道支持的即时传输速率。
  12. 如权利要求10或11所述的基站，其特征在于，所述索引差值占用的比特数小于4比特。
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