CN107645749B - Method and device for data transmission - Google Patents
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- CN107645749B CN107645749B CN201610579439.3A CN201610579439A CN107645749B CN 107645749 B CN107645749 B CN 107645749B CN 201610579439 A CN201610579439 A CN 201610579439A CN 107645749 B CN107645749 B CN 107645749B
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Abstract
The embodiment of the disclosure relates to a method and equipment for data transmission. The method comprises obtaining, at the base station, from the terminal device, performance parameters of an analog-to-digital converter at the terminal device. The method also includes determining a threshold transmission bandwidth based on the performance parameter. The method further includes transmitting data to the terminal device using a data transmission bandwidth below the threshold transmission bandwidth.
Description
Technical Field
The present disclosure relates generally to the field of communications, and more particularly, to methods and apparatus for data transmission.
Background
Millimeter-wave communications provide much greater bandwidth than existing cellular communications. For example, the bandwidth of millimeter wave communication systems may be in the range of 500MHz to 1GHz, while existing cellular communication systems operate in the microwave range, with transmission bandwidths typically in the range of 5MHz to 20 MHz. Thus, millimeter wave communication has greater potential to provide higher data transfer rates. However, millimeter-wave communication has its own challenges. According to shannon-nyquist sampling theorem, the sampling rate of an Analog to Digital Converter (ADC) at the terminal device should not be less than twice the system bandwidth to avoid losing information from the continuous time signal. This means that millimeter wave communication systems require the use of ADCs with much higher sampling rates than existing cellular communication systems.
However, ADCs with high sampling rates, high resolution, are expensive and power hungry devices. It is now widely recognized that the power consumption of an ADC has a linear relationship with its sampling rate and an exponential relationship with its resolution. Since the terminal device is generally power consumption limited, it would be inappropriate to employ an ADC having a high resolution at the terminal device when a large communication bandwidth is employed in the millimeter wave communication system.
Disclosure of Invention
The embodiment of the disclosure provides a method and equipment for data transmission.
In a first aspect of the disclosure, a method of data transmission is provided. The method comprises obtaining, at the base station, from the terminal device, performance parameters of an analog-to-digital converter at the terminal device. The method also includes determining a threshold transmission bandwidth based on the performance parameter. The method further includes transmitting data to the terminal device using a data transmission bandwidth below the threshold transmission bandwidth.
In some embodiments, the method further comprises: acquiring channel state information of a channel between a base station and terminal equipment from the terminal equipment; determining beamforming parameters for data transmission based on at least the channel state information and the performance parameters; and determining a transmission performance metric for the data transmission based on the data transmission bandwidth and the beamforming parameter.
In some embodiments, determining the transmission performance metric comprises determining at least one of: receiving a signal-to-noise ratio; and a transmission rate.
In some embodiments, the method further comprises: the peak value of the transmission performance metric is obtained by adjusting the data transmission bandwidth and the beamforming parameters.
In some embodiments, the method further comprises: the data transmission bandwidth is signaled to the terminal device.
In some embodiments, obtaining the performance parameter comprises obtaining at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
In a second aspect of the disclosure, a method of data transmission is provided. The method comprises providing, from the terminal device to the base station, performance parameters of an analog-to-digital converter at the terminal device for the base station to determine a threshold transmission bandwidth for downlink data transmission. The method also includes receiving, from the base station, data transmitted using a data transmission bandwidth below the threshold transmission bandwidth.
In some embodiments, providing the performance parameter comprises providing at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
In a third aspect of the disclosure, a base station is provided. The base station includes a receiver, a processor, and a transmitter. The receiver is configured to obtain, at the base station, from the terminal device, performance parameters of an analog-to-digital converter at the terminal device. The processor is configured to determine a threshold transmission bandwidth based on the performance parameter. The transmitter is configured to transmit data to the terminal device using a data transmission bandwidth below the threshold transmission bandwidth.
In some embodiments, the receiver is further configured to obtain channel state information of a channel between the base station and the terminal device from the terminal device; and the processor is further configured to determine beamforming parameters for the data transmission based on at least the channel state information and the performance parameters; and determining a transmission performance metric for the data transmission based on the data transmission bandwidth and the beamforming parameter.
In some embodiments, the processor is further configured to determine at least one of: receiving a signal-to-noise ratio; and a transmission rate.
In some embodiments, the processor is further configured to obtain a peak value of the transmission performance metric by adjusting a data transmission bandwidth and a beamforming parameter.
In some embodiments, the transmitter is further configured to signal the data transmission bandwidth to the end device.
In some embodiments, the receiver is further configured to obtain at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
In a fourth aspect of the present disclosure, a terminal device is provided. The terminal device includes a transmitter and a receiver. The transmitter is configured to provide, from the terminal device to the base station, performance parameters of an analog-to-digital converter at the terminal device for the base station to determine a threshold transmission bandwidth for downlink data transmission. The receiver is configured to receive data from a base station that is transmitted with a data transmission bandwidth below a threshold transmission bandwidth.
In some embodiments, the transmitter is further configured to provide at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 illustrates an example system in which embodiments of the present disclosure may be implemented;
fig. 2 shows a flow diagram of a method of data transmission implemented at a base station according to a first aspect of an embodiment of the present disclosure;
fig. 3 shows a flow chart of a method of data transmission implemented at a terminal device according to a second aspect of an embodiment of the present disclosure;
fig. 4 shows a block diagram of a data transmission arrangement according to a third aspect of an embodiment of the present disclosure;
fig. 5 shows a block diagram of a data transmission arrangement according to a fourth aspect of an embodiment of the present disclosure;
FIG. 6 shows a schematic block diagram of an apparatus suitable for use in practicing embodiments of the present disclosure; and
fig. 7 shows a graph of the change in average transmission rate with respect to the transmission signal-to-noise ratio.
Detailed Description
The principles and spirit of the present disclosure will be described with reference to a number of exemplary embodiments shown in the drawings. It is understood that these specific embodiments are described merely to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.
The terms "include" and variations thereof as used herein are inclusive and open-ended, i.e., "including but not limited to. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.
Fig. 1 illustrates an example system 100 in which embodiments of the present disclosure may be implemented. System 100 includes a base station 110 and a terminal device 120. In some embodiments, system 100 may be implemented as a millimeter wave communication system. In this regard, millimeter wave communication may be conducted between base station 110 and terminal device 120. Of course, this is not limiting and any broadband communication system now known or developed in the future may be used in conjunction with embodiments of the present disclosure.
The base station 110 may represent a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, a low power node, such as a pico base station, a femto base station, etc.
Currently, in a cellular communication system, since a bandwidth is narrow, an ADC having a low sampling rate and a high resolution can be used to obtain a high signal conversion accuracy. Although the resolution of a user-configurable ADC in existing cellular communication systems is high, the power consumption of the ADC is typically negligible due to its not high sampling rate.
However, the available communication bandwidth in millimeter wave communication systems is much larger than existing cellular communication systems. When a large communication bandwidth is employed in a millimeter wave communication system, employing an ADC with high resolution at the terminal device will result in power consumption exceeding acceptable levels, since the terminal device is typically power consumption limited.
To at least partially address the above and other potential drawbacks and problems in the conventional approaches, embodiments of the present disclosure propose employing an ADC with low resolution at the terminal device 120. Further, the terminal device 120 provides the base station 110 with performance parameters of the ADC at the terminal device 120, so that the base station 110 can select an appropriate data transmission bandwidth from the available high communication bandwidths based on the performance parameters to transmit data to the terminal device 120.
Fig. 2 shows a flow diagram of a data transmission method 200 according to an embodiment of the disclosure. In some embodiments, method 200 may be implemented, for example, by base station 110. It should be understood that the method 200 may also include additional steps not shown and/or may omit steps shown. The scope of the disclosed embodiments is not limited in this respect.
In step 210, base station 110 obtains performance parameters of ADC122 at terminal device 120 from terminal device 120. In some embodiments, base station 110 may obtain the desired power consumption of ADC122 from terminal device 120. In other embodiments, base station 110 may obtain the resolution of ADC122 from terminal device 120. In still other embodiments, base station 110 may obtain both the desired power consumption and resolution of ADC122 from terminal device 120. This is merely exemplary and is not intended to limit the scope of the present disclosure. In other embodiments, base station 110 may obtain any suitable performance parameters of ADC122 from terminal device 120.
In step 220, the base station 110 determines a threshold transmission bandwidth for the terminal device 120 based on the performance parameters of the ADC 122. In embodiments where base station 110 obtains both the desired power consumption and resolution of ADC122 from terminal device 120, base station 110 may determine the threshold transmission bandwidth for terminal device 120 using the following expression, as an example:
wherein WmaxRepresents a threshold transmission bandwidth; pADCRepresents the desired power consumption of ADC 122; b denotes the number of quantization bins (quantization bins) of the ADC122, i.e., B2bB represents the resolution of ADC 122; β is a constant and β — 494FJ, representing the energy consumption in the analog-to-digital conversion operation of the ADC 122.
As can be seen from expression (1) above, the desired power consumption P for a given ADC122ADCThe threshold transmission bandwidth W is reduced by 1 bit for each resolution reduction of the ADC122maxIt will double. Thus, when an ADC with a low resolution is employed at the terminal device 120, the base station 110 will have more flexibility to select the data transmission bandwidth for the terminal device 120 from the available transmission bandwidths.
It should be appreciated that the determination of the threshold transmission bandwidth for terminal device 120 using expression (1) above is merely exemplary and not limiting. Depending on the performance parameters of ADC122 obtained from terminal device 120, base station 110 may determine the threshold transmission bandwidth for terminal device 120 using any suitable approach.
In step 230, the base station 110 transmits data to the terminal device 120 using a data transmission bandwidth below the threshold transmission bandwidth. In other words, the actual data transmission bandwidth of the base station 110 transmitting data to the terminal device 120 is less than or equal to the determined threshold transmission bandwidth. Accordingly, the terminal device 120 receives data transmitted with a data transmission bandwidth below the threshold transmission bandwidth. Since the threshold transmission bandwidth is determined based on the performance parameters of the ADC122 obtained from the terminal device 120, the threshold transmission bandwidth will satisfy the constraints of the performance parameters of the ADC 122. Thus, the power consumption of the ADC122 does not exceed the desired power consumption. Thus, situations where the power consumption of the ADC122 exceeds an acceptable level due to too high a transmission bandwidth can be avoided.
It will be appreciated that different terminal devices may employ ADCs having different performance parameters. According to an embodiment of the present disclosure, the base station determines a threshold transmission bandwidth for the terminal device based on a performance parameter of the ADC. Thus, in case different terminal devices employ ADCs with different performance parameters, the base station may determine different threshold transmission bandwidths for different terminal devices. Therefore, the downlink data transmission according to the present disclosure has adaptivity to performance parameters of the ADC, thereby achieving better transmission performance.
Typically, the ADC122 introduces quantization noise when quantizing the analog signal received from the base station 110. In addition, the power of the quantization noise also increases as the resolution of the ADC122 decreases.
In existing cellular communication systems, quantization noise is negligible due to the use of ADCs with high resolution at the terminal equipment. However, in the case where an ADC having a low resolution is employed at a terminal device of the millimeter wave communication system, quantization noise will be much larger than that introduced by employing an ADC having a high resolution, thereby affecting the transmission performance of the system. Generally, the power of quantization noise increases as the power of a signal received from a base station (i.e., the power of an input signal of an ADC) increases. Therefore, the signal to be transmitted can be processed at the base station to reduce the influence of quantization noise on the transmission performance of the system.
In some embodiments, the system 100 shown in fig. 1 may be deployed as a multiple-input multiple-output (MIMO) system. In the case of MIMO systems, Beamforming (BF) techniques are typically employed to optimize data transmission. In this regard, quantization noise may be taken into account by taking the quantization noise into account in the beamforming design.
In some embodiments, the transmission performance of the system may be measured in terms of the received signal-to-noise ratio. In this regard, the effect of quantization noise on the received signal-to-noise ratio of the system may be reduced by taking the quantization noise into account in the beamforming design. In other embodiments, the transmission performance of the system may be measured in terms of transmission rate. In this regard, the effect of quantization noise on the transmission rate of the system may be reduced by taking the quantization noise into account in the beamforming design.
For illustrative purposes, the following will describe how to reduce the effect of quantization noise on the transmission rate of the system by beamforming design, taking a single-user scenario in a MIMO system as an example.
In order to perform beamforming for downlink data transmission, the base station 110 obtains channel state information of a channel between the base station 110 and the terminal device 120 from the terminal device 120. As a non-limiting implementation, the base station 110 may obtain the channel state information via an uplink training procedure.
Assume that base station 110 is equipped with NT(NTAn integer greater than 1) transmit antennas and terminal device 120 is equipped with only one receive antenna. Furthermore, it is assumed that the ADC122 at the terminal device 120 has B-bit resolution, i.e., that there is B-2 in the ADC122bAnd quantizing the lattice points. After beamforming, the signal y received by the antenna at terminal device 120 may be given by the following expression:
y＝hHwxS+z (2)
wherein
A vector representing the downlink channel is represented by,
the beam-forming parameters are represented by,
which is indicative of the information symbols being transmitted,
representing gaussian noise.
The antenna then inputs the received signal y to the ADC122 for quantization by the ADC 122. In the quantization process, if the received signal y (i.e., the input signal of the ADC 122) falls within the qth quantization bin (q e [1, B ]) of the ADC122, the output of the ADC122 (i.e., the quantized signal) may be given by the following expression:
yq＝αy+zq (3)
wherein α represents a constant and can be defined as
And z isqRepresenting quantization noise that has no statistical correlation with the received signal y. In one embodiment, the quantization noise zqThe variance of (d) can be given by the following expression:
E[|zq|2]＝α(1-α)E[|y|2] (4)
wherein E [ | zq|2]Representing quantization noise zqVariance of (E [ | y $)2]Representing the variance of the received signal y. Typically, the received signal y is considered to have a zero mean. Thus, E [ | zq|2]Can represent quantization noise zqAnd E [ | y $ -2]May represent the power of the received signal y. Thus, as can be seen from expression (4) above, the power of the quantization noise will increase as the power of the received signal y (i.e., the input signal of the ADC 122) increases.
By assuming quantization noise zqFor gaussian noise, the transmission rate R of the system can be given by the following expression:
where W represents the data transmission bandwidth and W ∈ (0, W)max]，N0Representing the power spectral density of additive gaussian noise.
As can be seen from the above expression (5), the transmission rate R of the system is related to the data transmission bandwidth and the beamforming parameter w (in this single-user scenario, the beamforming parameter w is a vector). Therefore, the peak of the transmission rate R can be obtained by optimizing (i.e., adjusting) the data transmission bandwidth W and the beamforming parameter W.
In some embodiments, an alternating optimization mechanism may be employed to alternately optimize the data transmission bandwidth W and the beamforming parameter W to obtain a peak of the transmission rate R. For example, one can first proceed from W ∈ (0, W)max]Selects a specific data transmission bandwidth, and then optimizes the beamforming parameter w by solving the following problem:
wherein P isTRepresenting the transmission power budget of the base station 110. The optimal beamforming parameter w obtained by the optimization processoptThis can be given by the following expression:
as can be seen from the above expression (7), the beamforming parameter w can be determined based on at least the downlink channel vector h and the performance parameter of the ADC 122.
It should be understood that the optimization mechanisms and corresponding expressions discussed above are merely exemplary and are in no way intended to limit embodiments of the present disclosure. In other embodiments, other optimization mechanisms are possible.
Further, as can be seen from the above expression (5), the power of additive gaussian noise is WN0. That is, the power of the additive gaussian noise is correlated with the data transmission bandwidth W, and the power of the additive gaussian noise will increase as the data transmission bandwidth W increases. Thus, a threshold transmission bandwidth W is employed for the terminal device 120maxIt is not always advantageous. Employing a transmission bandwidth W at a threshold value for terminal device 120maxIn the following case of a specific data transmission bandwidth, the base station 110 may signal the data transmission bandwidth to the terminal device 120. In some embodiments, base station 110 may provide the data transmission bandwidth to terminal device 120 using Radio Resource Control (RRC) signaling. Of course, any additional or alternative dedicated or generic signaling may be used as well.
In view of the relationship between the sampling rate of the ADC and the data transmission bandwidth as specified by shannon-nyquist sampling theorem, the ADC122 at the terminal device 120 may implement digital-to-analog conversion at a lower sampling rate, thereby further reducing the power consumption of the ADC 122.
The data transmission method implemented by the base station 110 has been described above with reference to fig. 2. Accordingly, fig. 3 shows a flow diagram of a data transmission method 300 implemented at terminal device 120 in accordance with an embodiment of the present disclosure. It should be understood that the method 300 may also include additional steps not shown and/or may omit the steps shown. The scope of the disclosed embodiments is not limited in this respect. Note that several features and functions described in fig. 3 have been described above with reference to the base station side embodiment, and therefore will not be described in detail below.
In step 310, the performance parameters of ADC122 at terminal device 120 are provided from terminal device 120 to base station 110 for base station 110 to determine a threshold transmission bandwidth for downlink data transmission. In some embodiments, the terminal device 120 may provide the performance parameters of the ADC122 to the base station 110 using Radio Resource Control (RRC) signaling. Of course, any additional or alternative dedicated or generic signaling may be used as well.
In some embodiments, the terminal device 120 may provide the base station 110 with the desired power consumption of the ADC 122. In other embodiments, terminal device 120 may provide base station 110 with the resolution of ADC 122. In still other embodiments, the terminal device 120 may provide both the desired power consumption and resolution of the ADC122 to the base station 110. This is merely exemplary and is not intended to limit the scope of the present disclosure. In other embodiments, terminal device 120 may provide any suitable performance parameters of ADC122 to base station 110.
In step 320, the terminal device 120 receives data transmitted with a data transmission bandwidth below the threshold transmission bandwidth from the base station 110. The ADC122 at the terminal device 120 may then digital-to-analog convert the received data at a sampling rate that is less than twice the threshold transmission bandwidth, such that the power consumption of the ADC122 does not exceed the desired power consumption. Thus, situations where the power consumption of the ADC122 exceeds an acceptable level due to too high a transmission bandwidth can be avoided.
Fig. 4 shows a block diagram of a data transmission device 400 according to an embodiment of the present disclosure. Apparatus 400 may be implemented at base station 110 or otherwise by base station 110. The apparatus 400 includes a parameter obtaining unit 410, a bandwidth determining unit 420, and a transmitting unit 430.
The parameter obtaining unit 410 is configured to obtain, at the base station, performance parameters of the analog-to-digital converter at the terminal device from the terminal device. The bandwidth determination unit 420 is configured to determine a threshold transmission bandwidth based on the performance parameter. The transmission unit 430 is configured to transmit data to the terminal device using a data transmission bandwidth below the threshold transmission bandwidth.
In some embodiments, the apparatus 400 further comprises a channel information acquisition unit, a beamforming unit, and a performance metric unit. The channel information acquisition unit is configured to acquire channel state information of a channel between the base station and the terminal device from the terminal device. The beamforming unit is configured to determine beamforming parameters for data transmission based on at least the channel state information and the performance parameters. The performance metric unit is configured to determine a transmission performance metric for the data transmission based on the data transmission bandwidth and the beamforming parameter.
In some embodiments, the performance metric unit is further configured to determine at least one of: receiving a signal-to-noise ratio; and a transmission rate.
In some embodiments, the apparatus 400 further comprises an adjustment unit. The adjustment unit is configured to obtain a peak value of the transmission performance metric by adjusting a data transmission bandwidth and a beamforming parameter.
In some embodiments, the apparatus 400 further comprises a providing unit. The providing unit is configured to signal a data transmission bandwidth to the terminal device.
In some embodiments, the parameter obtaining unit 410 is further configured to obtain at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
Fig. 5 shows a block diagram of a data transmission device 500 according to an embodiment of the present disclosure. Apparatus 500 may be implemented at terminal device 120 or otherwise by terminal device 120. The apparatus 500 comprises a parameter providing unit 510 and a receiving unit 520.
The parameter providing unit 510 is configured to provide the performance parameters of the analog-to-digital converter at the terminal device from the terminal device to the base station for the base station to determine a threshold transmission bandwidth for downlink data transmission. The receiving unit 520 is configured to receive data transmitted with a data transmission bandwidth below a threshold transmission bandwidth from a base station.
In some embodiments, the parameter providing unit 510 is further configured to provide at least one of: the desired power consumption of the analog-to-digital converter; and the resolution of the analog-to-digital converter.
For clarity, certain optional elements of the apparatus 400 and 500 are not shown in fig. 4 and 5. However, it should be understood that the various features described above with reference to fig. 1-3 are equally applicable to the apparatus 400 and 500. Furthermore, the units of the apparatuses 400 and 500 may be hardware units or software units. For example, in some embodiments, the apparatus 400 and 500 may be implemented in part or in whole using software and/or firmware, e.g., as a computer program product embodied on a computer-readable medium. Alternatively or additionally, the apparatus 400 may be implemented partly or entirely on hardware basis, e.g. as an Integrated Circuit (IC), an Application Specific Integrated Circuit (ASIC), a system on a chip (SOC), a Field Programmable Gate Array (FPGA), or the like. The scope of the present disclosure is not limited in this respect.
Fig. 6 illustrates a schematic block diagram of an apparatus 600 suitable for use in practicing embodiments of the present disclosure. It should be appreciated that device 600 may be implemented as base station 110 and/or terminal device 120 shown in fig. 1.
As shown in fig. 6, the device 600 includes a controller or processor 610, a memory 620 coupled to the processor 610, a suitable RF transmitter TX and receiver RX 640 coupled to the processor 610, and a communication interface 650 coupled to the processor 610. The memory 620 may contain a program 630 stored thereon. TX/RX 640 is used for bi-directional wireless communications. Note that TX/RX 640 has at least one antenna for facilitating communication.
The communication interface 650 may represent any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between enbs, an S1 interface for communication between a Mobile Management Entity (MME)/serving gateway (S-GW) and an eNB, a Un interface for communication between an eNB and a Relay Node (RN), or a Uu interface for communication between an eNB and a terminal device.
The program 630 stored in the memory 620 includes instructions that, when executed by the processor 610, enable the device 600 to operate in accordance with the exemplary embodiments of the disclosure as discussed herein with respect to the methods 200 and 300. In general, embodiments of the disclosure may be implemented by computer software executable by the processor 610 of the device 600, or by hardware, or by a combination of software and hardware.
The memory 620 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. Although only one memory is shown in device 600, there may be several physically distinct memory units in device 600. The processor 610 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. Device 600 may have multiple processors, such as, for example, application specific integrated circuit chips that are subordinate in time to a clock that synchronizes the host processor. The apparatus 600 discussed herein may be embodied as, or a part of, a user equipment.
The embodiment of the disclosure can obtain higher downlink data transmission rate. Fig. 7 shows a graph of the average transmission rate versus the transmission signal-to-noise ratio obtained with the scheme of the present disclosure and the prior art scheme, respectively.
In fig. 7, curve 710 depicts the variation of the average transmission rate obtained when the terminal device 120 employs a high resolution ADC (and thus negligible quantization noise) with respect to the transmission signal-to-noise ratio. In this case, the base station 110 transmits a signal using conventional conjugate beamforming.
As can be seen by comparing curves 710, 720 and 730, when the terminal device 120 employs a 3-bit resolution ADC and the base station 110 obtains performance parameters of the ADC from the terminal device 120, a higher downlink transmission rate can be achieved if a larger transmission bandwidth is employed.
Furthermore, with a larger transmission bandwidth, the average transmission rate obtained with the scheme of the present disclosure (as shown by curve 730) is higher than the average transmission rate obtained when the terminal device 120 employs a high resolution ADC.
It should be noted that the embodiments of the present disclosure can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided, for example, in programmable memory or on a data carrier such as an optical or electronic signal carrier.
Further, while the operations of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions. It should also be noted that the features and functions of two or more devices according to the present disclosure may be embodied in one device. Conversely, the features and functions of one apparatus described above may be further divided into embodiments by a plurality of apparatuses.
While the present disclosure has been described with reference to several particular embodiments, it is to be understood that the disclosure is not limited to the particular embodiments disclosed. The disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (16)
1. A method of data transmission, comprising:
acquiring performance parameters of an analog-to-digital converter at a terminal device from the terminal device at a base station;
determining a threshold transmission bandwidth based on the performance parameter; and
and transmitting data to the terminal equipment by using the data transmission bandwidth below the threshold transmission bandwidth.
2. The method of claim 1, further comprising:
acquiring channel state information of a channel between the base station and the terminal equipment from the terminal equipment;
determining beamforming parameters for the data transmission based at least on the channel state information and the performance parameters; and
determining a transmission performance metric for the data transmission based on the data transmission bandwidth and the beamforming parameter.
3. The method of claim 2, wherein determining the transmission performance metric comprises determining at least one of:
receiving a signal-to-noise ratio; and
the transmission rate.
4. The method of claim 2 or 3, further comprising:
obtaining a peak value of the transmission performance metric by adjusting the data transmission bandwidth and the beamforming parameter.
5. The method of claim 1, further comprising:
signaling the data transmission bandwidth to the terminal device.
6. The method of claim 1, wherein obtaining the performance parameter comprises obtaining at least one of:
a desired power consumption of the analog-to-digital converter; and
resolution of the analog-to-digital converter.
7. A method of data transmission, comprising:
providing, from a terminal device to a base station, performance parameters of an analog-to-digital converter at the terminal device for the base station to determine a threshold transmission bandwidth for downlink data transmission; and
receiving data from the base station that is transmitted using a data transmission bandwidth below the threshold transmission bandwidth.
8. The method of claim 7, wherein providing the performance parameter comprises providing at least one of:
a desired power consumption of the analog-to-digital converter; and
resolution of the analog-to-digital converter.
9. A base station, comprising:
a receiver configured to obtain, at the base station, performance parameters of an analog-to-digital converter at a terminal device from the terminal device;
a processor configured to determine a threshold transmission bandwidth based on the performance parameter; and
a transmitter configured to transmit data to the terminal device using a data transmission bandwidth below the threshold transmission bandwidth.
10. The base station of claim 9, wherein:
the receiver is further configured to obtain channel state information of a channel between the base station and the terminal device from the terminal device; and is
The processor is further configured to determine beamforming parameters for the data transmission based at least on the channel state information and the performance parameters; and determining a transmission performance metric for the data transmission based on the data transmission bandwidth and the beamforming parameter.
11. The base station of claim 10, wherein the processor is further configured to determine at least one of:
receiving a signal-to-noise ratio; and
the transmission rate.
12. The base station according to claim 10 or 11, wherein the processor is further configured to obtain a peak value of the transmission performance metric by adjusting the data transmission bandwidth and the beamforming parameter.
13. The base station of claim 9, wherein the transmitter is further configured to signal the data transmission bandwidth to the terminal device.
14. The base station of claim 9, wherein the receiver is further configured to obtain at least one of:
a desired power consumption of the analog-to-digital converter; and
resolution of the analog-to-digital converter.
15. A terminal device, comprising:
a transmitter configured to provide performance parameters of an analog-to-digital converter at the terminal device from the terminal device to a base station for the base station to determine a threshold transmission bandwidth for downlink data transmission; and
a receiver configured to receive data transmitted with a data transmission bandwidth below the threshold transmission bandwidth from the base station.
16. The terminal device of claim 15, wherein the transmitter is further configured to provide at least one of:
a desired power consumption of the analog-to-digital converter; and
resolution of the analog-to-digital converter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007098641A1 (en) * | 2006-03-03 | 2007-09-07 | Huawei Technologies Co., Ltd. | A access method of user equipments in mobile communication system |
| CN102256339A (en) * | 2010-05-17 | 2011-11-23 | 中兴通讯股份有限公司 | Service data transmission method, receiver, mobile terminal, transmitter and base station |
| CN103999528A (en) * | 2011-09-30 | 2014-08-20 | 交互数字专利控股公司 | Device communication using a reduced channel bandwidth |
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| US10194388B2 (en) * | 2014-03-31 | 2019-01-29 | Samsung Electronics Co., Ltd. | Method and apparatus to enable low power synchronization for large bandwidth wireless LAN systems |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007098641A1 (en) * | 2006-03-03 | 2007-09-07 | Huawei Technologies Co., Ltd. | A access method of user equipments in mobile communication system |
| CN102256339A (en) * | 2010-05-17 | 2011-11-23 | 中兴通讯股份有限公司 | Service data transmission method, receiver, mobile terminal, transmitter and base station |
| CN103999528A (en) * | 2011-09-30 | 2014-08-20 | 交互数字专利控股公司 | Device communication using a reduced channel bandwidth |
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