CN106792889B - Device and method for scheduling transmission time interval length, communication terminal and base station - Google Patents

Device and method for scheduling transmission time interval length, communication terminal and base station Download PDF

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CN106792889B
CN106792889B CN201610422961.0A CN201610422961A CN106792889B CN 106792889 B CN106792889 B CN 106792889B CN 201610422961 A CN201610422961 A CN 201610422961A CN 106792889 B CN106792889 B CN 106792889B
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threshold
time interval
transmission time
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candidate transmission
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CN106792889A (en
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塔帕尼·韦斯特曼
卡尔·兰皮宁
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H04L1/1678—Details of the supervisory signal the supervisory signal being transmitted together with control information where the control information is for timing, e.g. time stamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

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

Abstract

The invention provides a device and a method for scheduling transmission time interval length, wherein the device for scheduling TTI comprises the following steps: a processor configured to obtain coherence time estimation data, at least one threshold, and a plurality of candidate TTI lengths; establishing a corresponding relation between the comparison result of the coherent time estimation data and at least one threshold value and a plurality of candidate TTI lengths; and comparing the coherent time estimate data to at least one threshold; and a scheduler for scheduling the TTI length from the plurality of candidate TTI lengths to the communication base station according to the comparison result of the coherence time estimation data and the at least one threshold and the established correspondence. The invention also provides a communication terminal and a base station. According to the technical scheme provided by the invention, shorter TTI is used, the time delay of receiving periodic and aperiodic CSI reports is shortened, better CSI feedback quality is obtained, the reliability of data transmission and the user perception throughput are improved, longer TTI is used, the system overhead is reduced, and the throughput which can be effectively utilized is improved.

Description

Device and method for scheduling transmission time interval length, communication terminal and base station
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a device and a method for scheduling transmission time interval length, a communication terminal, and a communication base station.
Background
The quality of the Channel State Information (CSI) estimate plays an important role in the reliability and throughput of the communication link. In a dynamic environment, i.e., where the transmitter and receiver are moving rapidly, it is desirable that the CSI reporting delay be as short as possible. Otherwise, the received CSI estimate may not accurately describe the current communication channel conditions. The channel coherence time (coherence time) refers to a period of time during which the channel condition remains unchanged. Specifically, the faster the transmitter and receiver move, the shorter the coherence time.
In the physical layer, many cellular communication systems schedule Transmission data based on a predetermined Time unit, for example, a Transmission Time Interval (TTI). In the prior art, a fixed TTI length is used, for example, for a Long Term Evolution (LTE) system, the TTI length is always 1 ms. Therefore, the influence of the channel coherence time in the CSI reporting process is not considered in the prior art. Thus, when the coherence time is less than the fixed CSI reporting delay, the quality of CSI feedback is not high, so a shorter CSI reporting delay is needed in this case.
According to the relation between the TTI length and the CSI report delay, it can be known that the shorter the TTI length is, the shorter the delay is. However, since the signal transmitted in each TTI needs to include Physical layer Control Information, using a shorter TTI length may result in more overhead (overhead) in data transmission, for example, in each Physical Downlink Shared Channel (PDSCH) TTI, a Physical Downlink Control Channel (PDCCH) or Downlink Control Information (DCI) transmitted on an enhanced PDCCH is needed.
Disclosure of Invention
The embodiment of the invention provides a device and a method for scheduling TTI length, which are used for improving the reliability of data transmission and improving the throughput.
The apparatus for scheduling TTI length comprises: a processor configured to obtain coherence time estimation data, at least one threshold, and a plurality of candidate TTI lengths; establishing correspondence of the results of the comparison of the coherence time estimation data and the at least one threshold value to the plurality of candidate TTI lengths; and comparing the coherence time estimation data to the at least one threshold; and a scheduler for scheduling a TTI length from the plurality of candidate TTI lengths to a communications base station based on the comparison of the coherence time estimation data to the at least one threshold and the established correspondence. Optionally, the number of the at least one threshold is one less than the number of the plurality of candidate TTI lengths.
Optionally, the at least one threshold is a value corresponding to a highest throughput of a plurality of acquired data throughputs, where the plurality of data throughputs are acquired by presetting a plurality of combinations based on a plurality of candidate values and a plurality of candidate transmission time interval lengths and performing computer simulation based on the plurality of combinations.
Optionally, the processor is configured to obtain a first threshold and two candidate TTI lengths, and the correspondence relationship established by the processor includes: selecting a longer TTI of the two candidate TTI lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter TTI of the two candidate TTI lengths if the coherence time estimate data is less than the first threshold.
Optionally, the processor is configured to obtain a first threshold, a second threshold, and three candidate TTI lengths, where the second threshold is greater than the first threshold, the three candidate TTI lengths include a first candidate TTI length, a second candidate TTI length, and a third candidate TTI length, the first candidate TTI length is smaller than the second candidate TTI length, and the second candidate TTI length is smaller than the third candidate TTI length. The correspondence established by the processor includes: selecting the first candidate TTI length if the coherence time estimate data is less than the first threshold; selecting the third candidate TTI length if the coherence time estimate data is greater than the second threshold; otherwise, the second candidate TTI length is selected.
The method for scheduling TTI comprises the following steps: obtaining coherence time estimation data, at least one threshold and a plurality of candidate TTI lengths; establishing correspondence of the results of the comparison of the coherence time estimation data and the at least one threshold value to the plurality of candidate TTI lengths; comparing the coherence time estimation data to the at least one threshold; and scheduling the TTI length from the plurality of candidate TTI lengths to a communication base station according to the comparison result of the coherence time estimation data and the at least one threshold and the established corresponding relation. Optionally, the number of the at least one threshold is one less than the number of the plurality of candidate TTI lengths.
Optionally, the at least one threshold is a value corresponding to a highest throughput of a plurality of acquired data throughputs, where the plurality of data throughputs are acquired by presetting a plurality of combinations based on a plurality of candidate values and a plurality of candidate transmission time interval lengths and performing computer simulation based on the plurality of combinations.
Optionally, obtaining the at least one threshold and the plurality of candidate TTI lengths comprises: a first threshold and two candidate TTI lengths are obtained. The established corresponding relationship comprises: selecting a longer TTI of the two candidate TTI lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter TTI of the two candidate TTI lengths if the coherence time estimate data is less than the first threshold.
Optionally, obtaining the at least one threshold and the plurality of candidate TTI lengths comprises: obtaining a first threshold, a second threshold and three candidate TTI lengths, wherein the second threshold is greater than the first threshold, the three candidate TTI lengths comprise a first candidate TTI length, a second candidate TTI length and a third candidate TTI length, the first candidate TTI length is less than the second candidate TTI length, and the second candidate TTI length is less than the third candidate TTI length. The established corresponding relationship comprises: selecting the first candidate TTI length if the coherence time estimate data is less than the first threshold; selecting the third candidate TTI length if the coherence time estimate data is greater than the second threshold; otherwise, the second candidate TTI length is selected.
The embodiment of the invention also provides a communication terminal and a communication base station. The communication terminal includes: a coherence time estimator for estimating a channel coherence time based on the channel information to obtain coherence time estimation data; and a transmitter for transmitting the coherence time estimation data to a communication base station.
Optionally, the transmitter is configured to transmit the coherence time estimation data through an upper layer message, where the upper layer message is a message formed in a protocol layer above a physical layer. Optionally, the transmitter is configured to transmit the coherence time estimation data through channel state information, wherein the channel state information includes a rank indication, a channel quality indication, or a precoding matrix indication.
Optionally, the transmitter is configured to periodically transmit the coherence time estimation data to the communication base station. Optionally, the transmitter is configured to transmit the coherence time estimation data to the communication base station aperiodically or triggered by a condition.
The communication base station includes: a receiver for receiving coherence time estimation data; and means for scheduling the TTI length.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
adaptively scheduling the TTI length based on the obtained coherence time estimation data by means of a relationship established between the comparison of the coherence time estimation data with the at least one threshold and the plurality of candidate TTI lengths. When the coherence time is short, a short TTI is used, and the time delay for receiving periodic and aperiodic CSI reports is shortened, so that better CSI feedback quality is obtained, the reliability of data transmission is improved, and the user perception throughput is improved. When the coherence time is longer, a longer TTI is used, the system overhead is reduced, and the throughput which can be effectively utilized is improved.
Drawings
FIG. 1 is a block diagram of an apparatus for scheduling TTI according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for scheduling TTI in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for scheduling TTI in accordance with an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for scheduling TTI in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a communication terminal of an embodiment of the present invention; and
fig. 6 is a schematic structural diagram of a communication base station according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a device and a method for scheduling TTI length, which are used for improving the reliability of data transmission and improving the throughput.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The invention will now be described with reference to specific examples. Accordingly, the disclosed embodiments should not be construed as unduly limiting this invention.
The embodiment of the invention provides a device for scheduling TTI length, which estimates the appropriate TTI length to a communication base station according to the obtained coherent time. Referring to fig. 1, an apparatus 100 for scheduling TTI length according to an embodiment of the present invention includes a processor 102 and a scheduler 104.
The processor 102 is configured to obtain coherence time estimation data, at least one threshold, and a plurality of candidate TTI lengths, and establish a correspondence between a comparison result of the coherence time estimation data and the at least one threshold and the plurality of candidate TTI lengths.
In an embodiment of the present invention, the apparatus 100 for scheduling TTI length may be disposed inside a communication base station, and the coherence time estimation data is transmitted from a communication terminal to the communication base station, so that the apparatus 100 for scheduling TTI length may obtain the coherence time estimation data through a receiver of the communication base station. In some embodiments, the apparatus 100 for scheduling the TTI length may be external to a communications base station, such that the apparatus 100 for scheduling the TTI length obtains the coherence time estimation data from the communications base station.
In one embodiment, the number of the at least one threshold is one less than the number of the plurality of candidate TTI lengths. In one embodiment, the plurality of candidate TTI lengths includes at least one candidate TTI length less than 1ms and at least one candidate TTI length greater than 1 ms. In one embodiment, the at least one threshold may be a coherence time value corresponding to a highest throughput of a plurality of acquired data throughputs, where the plurality of data throughputs are acquired by presetting a plurality of combinations based on a candidate coherence time value physically representing a coherence time and a candidate TTI length and performing computer simulation based on the plurality of combinations. In one embodiment of the invention, the processor 102 is further configured to compare the coherence time estimation data to the at least one threshold.
In an embodiment of the present invention, the processor 102 is configured to obtain a first threshold and two candidate TTI lengths, and the established correspondence relationship includes: selecting a longer TTI of the two candidate TTI lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter TTI of the two candidate TTI lengths if the coherence time estimate data is less than the first threshold. In one embodiment, the longer TTI is greater than 1ms and the shorter TTI is less than 1 ms.
In another embodiment of the present invention, the processor 102 is configured to obtain a first threshold, a second threshold and three candidate TTI lengths. Thus, compared with the method of acquiring one threshold and two candidate TTI lengths, the method can acquire a more appropriate TTI length, and further improve the quality of CSI feedback, thereby further improving the reliability and throughput of data transmission. Specifically, more thresholds and candidate TTI lengths may provide more accurate CSI feedback and adaptive adjustment of system overhead for channel coherence time.
Specifically, the second threshold is greater than the first threshold, the three candidate TTI lengths include a first candidate TTI length, a second candidate TTI length, and a third candidate TTI length, the first candidate TTI length is less than the second candidate TTI length, and the second candidate TTI length is less than the third candidate TTI length. In one embodiment, the three candidate TTI lengths include at least one candidate TTI length less than 1ms and at least one candidate TTI length greater than 1 ms.
In one embodiment, the correspondence relationship established by the processor 102 includes: selecting the first candidate TTI length if the coherence time estimate data is less than the first threshold; selecting the third candidate TTI length if the coherence time estimate data is greater than the second threshold; otherwise, the second candidate TTI length is selected.
The scheduler 104 is configured to schedule a TTI length from the plurality of candidate TTI lengths to the communication base station according to the comparison of the coherence time estimation data with the at least one threshold and the established correspondence. Specifically, the communications base station applies the scheduled TTI length to data transmissions. In one embodiment of the invention, the TTI length is obtained by selecting one of a plurality of candidate TTI lengths.
In one embodiment of the invention, the communication base station applies one TTI length to all data transmissions. In another embodiment of the present invention, the communications base station applies different TTI lengths to multiple data transmissions corresponding to multiple communications terminals simultaneously.
Specifically, when the coherence time is short, the apparatus schedules a shorter TTI to the communication base station so that the transmission delay of the periodic CSI report can be reduced. For the delay of the aperiodic CSI report, the apparatus selecting a shorter TTI length can shorten a delay from the reception of an uplink transmission grant (grant) transmitted from the communication base station to the transmission of the aperiodic CSI report and a transmission delay of the aperiodic CSI report, the uplink transmission grant being transmitted to the communication terminal for allowing the communication terminal to transmit data to the communication base station. Because the CSI report is fed back more quickly, the CSI feedback can better describe the condition of the current communication channel, so that better CSI feedback quality is achieved, the reliability of subsequent data transmission is improved, and the user perception throughput is improved. When the coherence time is longer, the apparatus can reduce the overhead in data transmission by scheduling a longer TTI, thereby improving the throughput that can be effectively utilized.
The embodiment of the invention also provides a method for scheduling the TTI length, which estimates the appropriate TTI length to the communication base station according to the obtained coherent time. Referring to fig. 2, an embodiment of the present invention provides a method 200 for scheduling TTI length, which includes the following steps.
Step 202 is obtaining coherence time estimation data, at least one threshold value, and a plurality of candidate TTI lengths. In one embodiment, the coherence time estimation data may be obtained from a communication terminal by a receiver of a communication base station.
In one embodiment, the at least one threshold is a coherence time value corresponding to a highest throughput of a plurality of acquired data throughputs, wherein the plurality of data throughputs are acquired by presetting a plurality of combinations based on a candidate coherence time value and a candidate TTI length which physically represent coherence time and performing computer simulation based on the plurality of combinations.
In one embodiment, the number of the at least one threshold is one less than the number of the plurality of candidate TTI lengths. In one embodiment, the plurality of candidate TTI lengths includes at least one candidate TTI length less than 1ms and at least one candidate TTI length greater than 1 ms.
Step 204 is establishing a correspondence between the results of the comparison of the coherence time estimation data and the at least one threshold and the plurality of candidate TTI lengths.
Step 206 is comparing the coherence time estimation data to the at least one threshold.
Step 208 is scheduling a TTI length from the plurality of candidate TTI lengths to the communication base station based on the comparison of the coherence time estimation data to the at least one threshold and the established correspondence. In one embodiment of the invention, the TTI length is obtained by selecting one of a plurality of candidate TTI lengths.
In a specific embodiment of the present invention, referring to fig. 3, a method 300 of providing a scheduled TTI length includes the following steps.
Step 302 is to obtain coherence time estimation data, a first threshold and two candidate TTI lengths. In one embodiment, the coherence time estimation data may be obtained from a communication terminal by a receiver of a communication base station.
In one embodiment, the first threshold is a coherence time value corresponding to a highest throughput of a plurality of acquired data throughputs, where the plurality of data throughputs are acquired by presetting a plurality of combinations based on a candidate coherence time value physically representing a coherence time and a candidate TTI length and performing computer simulation based on the plurality of combinations.
Step 304 is to establish a correspondence between the results of the comparison of the coherence time estimation data and the first threshold and the two candidate TTI lengths.
In one embodiment, the established correspondence includes: selecting a longer TTI of the two candidate TTI lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter TTI of the two candidate TTI lengths if the coherence time estimate data is less than the first threshold. In one embodiment, the longer TTI is greater than 1ms and the shorter TTI is less than 1 ms.
Step 306 is comparing the coherence time estimation data to the first threshold.
Step 308 is scheduling a TTI length from the two candidate TTI lengths to the communication base station according to the comparison result of the coherence time estimation data and the first threshold and the established correspondence.
It should be noted that more threshold values and candidate TTI lengths may be adopted to obtain a more suitable TTI length, so as to further improve the quality of CSI feedback, thereby further improving the reliability and throughput of data transmission.
In another embodiment of the present invention, referring to fig. 4, a method 400 of providing a scheduled TTI length includes the following steps.
Step 402 is to obtain coherence time estimation data, a first threshold, a second threshold, and three candidate TTI lengths. Wherein the second threshold is greater than the first threshold, the three candidate TTI lengths include a first candidate TTI length, a second candidate TTI length, and a third candidate TTI length, the first candidate TTI length is less than the second candidate TTI length, and the second candidate TTI length is less than the third candidate TTI length. In one embodiment, the coherence time estimation data may be obtained from a communication terminal by a receiver of a communication base station.
In one embodiment, the first threshold and the second threshold are coherence time values corresponding to a highest throughput of a plurality of acquired data throughputs, wherein the plurality of data throughputs are acquired by presetting a plurality of combinations based on candidate coherence time values and candidate TTI lengths which physically represent coherence times and performing computer simulation based on the plurality of combinations. In one embodiment, the three candidate TTI lengths include at least one candidate TTI length less than 1ms and at least one candidate TTI length greater than 1 ms.
Step 404 is to establish correspondence between the results of comparing the coherence time estimation data with the first threshold and the second threshold and the three candidate TTI lengths.
In one embodiment, the established correspondence includes: selecting the first candidate TTI length if the coherence time estimate data is less than the first threshold; selecting the third candidate TTI length if the coherence time estimate data is greater than the second threshold; otherwise, the second candidate TTI length is selected.
Step 406 is comparing the coherence time estimation data to the first threshold; comparing the coherence time estimate data to the second threshold if the coherence time estimate data is greater than the first threshold.
Step 408 is scheduling a TTI length to the communication base station from the three candidate TTI lengths according to the comparison result of the coherence time estimation data with the first threshold or the second threshold and the established correspondence.
In summary, the TTI length is adaptively scheduled according to the obtained coherence time estimation data by means of the relationship established between the comparison result of the coherence time estimation data with the at least one threshold and the plurality of candidate TTI lengths. When the coherence time is short, a short TTI is used, and the time delay for receiving periodic and aperiodic CSI reports is shortened, so that better CSI feedback quality is obtained, the reliability of data transmission is improved, and the user perception throughput is improved. When the coherence time is longer, a longer TTI is used, the system overhead is reduced, and the throughput which can be effectively utilized is improved.
The embodiment of the invention also provides a communication terminal, and the communication terminal sends the coherence time estimation data to the communication base station. Referring to fig. 5, an embodiment of the present invention provides a communication terminal 500 including a coherence time estimator 501 and a transmitter 503.
The coherence time estimator 501 is configured to estimate a channel coherence time based on the channel information to obtain coherence time estimation data.
The transmitter 503 is configured to transmit the coherence time estimation data to a communication base station 510.
In one embodiment of the invention, the transmitter 503 is configured to transmit the coherence time estimation data by using an upper layer message, wherein the upper layer message may be a message formed in a protocol layer above a physical layer.
In another embodiment of the present invention, the communication terminal 500 further comprises a Channel State Information (CSI) estimator 502 for estimating CSI to obtain CSI parameters. The transmitter 503 is configured to transmit the coherence time estimation data through a CSI report, where the CSI report includes the CSI parameter and may further include the coherence time estimation data, that is, the coherence time estimation data is a part of the CSI report. Specifically, the CSI parameter includes a Rank Indicator (RI), a Channel Quality Indicator (CQI), or a Precoding Matrix Indicator (PMI).
In one embodiment of the invention, the transmitter 503 is configured to periodically transmit the coherence time estimation data to the communication base station 510. In another embodiment of the invention, the transmitter 503 is configured to transmit the coherence time estimation data to the communication base station 510 aperiodically or triggered by a condition.
In one embodiment, the transmitter 503 transmits the coherence time estimation data to the communication base station 510 for TTI length adaptation when a communication link is established and starts to transmit data. In another embodiment, if the coherence time estimated by the communication terminal 500 has a significant variation, the transmitter 503 transmits the coherence time estimation data to the communication base station 510 for TTI length adaptive adjustment. In another embodiment, if the coherence time estimated by the communication terminal 500 is greater than a third threshold, the transmitter 503 transmits the coherence time estimation data to the communication base station 510; or if the coherence time is smaller than a fourth threshold, the transmitter 503 transmits the coherence time estimation data to the communication base station 510, where the third threshold and the fourth threshold are preset, the third threshold is larger than the fourth threshold, and the coherence time estimation data is transmitted to the communication base station 510 for adaptive TTI length adjustment. In another embodiment, the transmitter 503 may be triggered by human operation to transmit the coherence time estimation data to the communication base station 510.
The embodiment of the invention also provides a communication base station. Referring to fig. 6, a communication base station 600 according to an embodiment of the present invention includes a receiver 601 and an apparatus 603 for scheduling TTI length.
The receiver 601 is configured to receive coherence time estimation data from a communication terminal.
The means for scheduling TTI length 603 is configured to schedule a TTI length obtained from the coherence time estimation data.
In an embodiment of the present invention, the apparatus 603 for scheduling a TTI length is any one of the apparatuses for scheduling a TTI length provided in the above embodiments of the present invention.
In one embodiment of the present invention, the communication base station 600 applies one TTI length to all data transmissions. In another embodiment of the present invention, the communication base station 600 applies different TTI lengths to multiple data transmissions corresponding to multiple communication terminals simultaneously.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. An apparatus for scheduling transmission time interval lengths, comprising:
a processor for obtaining coherence time estimation data, at least one threshold and a plurality of candidate transmission time interval lengths; establishing a correspondence between the results of the comparison of the coherence time estimation data and the at least one threshold and the plurality of candidate transmission time interval lengths; and comparing the coherence time estimation data to the at least one threshold; the processor is configured to obtain a first threshold and two candidate transmission time interval lengths, and the correspondence relationship established by the processor includes: selecting a longer transmission time interval of the two candidate transmission time interval lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter one of the two candidate tti lengths if the estimated coherence time data is less than the first threshold;
and a scheduler for scheduling a transmission time interval length from the plurality of candidate transmission time interval lengths to a communication base station according to a comparison result of the coherence time estimation data and the at least one threshold value and the established correspondence.
2. The apparatus of claim 1, wherein the at least one threshold is a coherence time value corresponding to a highest throughput of a plurality of data throughputs obtained after computer simulation by presetting a plurality of combinations based on a plurality of candidate coherence time values and a plurality of candidate transmission time interval lengths.
3. The apparatus of claim 1, wherein a number of the at least one threshold is one less than a number of the plurality of candidate transmission time interval lengths.
4. The apparatus of claim 1, wherein the processor is configured to obtain a first threshold, a second threshold and three candidate transmission time interval lengths, wherein the second threshold is greater than the first threshold, wherein the three candidate transmission time interval lengths comprise a first candidate transmission time interval length, a second candidate transmission time interval length and a third candidate transmission time interval length, wherein the first candidate transmission time interval length is less than the second candidate transmission time interval length, and wherein the second candidate transmission time interval length is less than the third candidate transmission time interval length.
5. The apparatus of claim 4, wherein the correspondence established by the processor comprises: selecting the first candidate tti length if the tti data is less than the first threshold; selecting the third candidate tti length if the tti data is greater than the second threshold; otherwise, selecting the second candidate transmission time interval length.
6. A method of scheduling transmission time interval lengths, comprising:
obtaining coherence time estimation data, at least one threshold value and a plurality of candidate transmission time interval lengths; obtaining the at least one threshold and the plurality of candidate transmission time interval lengths comprises: acquiring a first threshold and two candidate transmission time interval lengths;
establishing a correspondence between the results of the comparison of the coherence time estimation data and the at least one threshold and the plurality of candidate transmission time interval lengths; the established corresponding relationship comprises: selecting a longer transmission time interval of the two candidate transmission time interval lengths if the coherence time estimate data is greater than the first threshold; selecting a shorter one of the two candidate tti lengths if the estimated coherence time data is less than the first threshold;
comparing the coherence time estimation data to the at least one threshold; and
scheduling a transmission time interval length from the plurality of candidate transmission time interval lengths to a communication base station according to the comparison result of the coherence time estimation data and the at least one threshold and the established corresponding relation.
7. The method of claim 6, wherein the at least one threshold is a coherence time value corresponding to a highest throughput of a plurality of data throughputs that are obtained after computer simulation by presetting a plurality of combinations based on a plurality of candidate coherence time values and a plurality of candidate transmission time intervals and based on the plurality of combinations.
8. The method of claim 6, wherein a number of the at least one threshold is one less than a number of the plurality of candidate transmission time interval lengths.
9. The method of claim 6, wherein obtaining the at least one threshold and the plurality of candidate transmission time interval lengths comprises: acquiring a first threshold, a second threshold and three candidate transmission time interval lengths, wherein the second threshold is greater than the first threshold, the three candidate transmission time interval lengths include a first candidate transmission time interval length, a second candidate transmission time interval length and a third candidate transmission time interval length, the first candidate transmission time interval length is smaller than the second candidate transmission time interval length, and the second candidate transmission time interval length is smaller than the third candidate transmission time interval length.
10. The method of claim 9, wherein the established correspondence comprises: selecting the first candidate tti length if the tti data is less than the first threshold; selecting the third candidate tti length if the tti data is greater than the second threshold; otherwise, selecting the second candidate transmission time interval length.
11. A communication base station, comprising:
a receiver for receiving coherence time estimation data; and
the apparatus for scheduling transmission time interval length according to any of claims 1 to 5.
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