WO2019213934A1 - 用于传输信号的方法及相应的用户终端、基站 - Google Patents

用于传输信号的方法及相应的用户终端、基站 Download PDF

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Publication number
WO2019213934A1
WO2019213934A1 PCT/CN2018/086470 CN2018086470W WO2019213934A1 WO 2019213934 A1 WO2019213934 A1 WO 2019213934A1 CN 2018086470 W CN2018086470 W CN 2018086470W WO 2019213934 A1 WO2019213934 A1 WO 2019213934A1
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Prior art keywords
reference signal
user terminal
base station
auxiliary reference
auxiliary
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PCT/CN2018/086470
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English (en)
French (fr)
Inventor
冯冬博
李祥明
叶能
刘文佳
侯晓林
王闰昕
刘柳
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株式会社Ntt都科摩
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Application filed by 株式会社Ntt都科摩 filed Critical 株式会社Ntt都科摩
Priority to US16/981,842 priority Critical patent/US11469926B2/en
Priority to CN201880091056.9A priority patent/CN111837351B/zh
Priority to PCT/CN2018/086470 priority patent/WO2019213934A1/zh
Publication of WO2019213934A1 publication Critical patent/WO2019213934A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03305—Joint sequence estimation and interference removal
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present disclosure relates to the field of mobile communications, and more particularly to a method for transmitting signals and corresponding user terminals, base stations.
  • MTC Machine Type Communication
  • the user terminal sends an uplink reference signal, such as a Demodulation Reference Signal (DMRS), to the base station, so that the base station performs channel estimation according to the uplink reference signal to detect and demodulate the information sent by the user terminal.
  • DMRS Demodulation Reference Signal
  • the uplink reference signals sent by multiple user terminals collide, causing interference between multiple user terminals, which reduces the system performance of the communication system.
  • the base station In order to reduce the collision between the uplink reference signals, a method in which the base station expands the pattern of the uplink reference signal has been proposed.
  • the base station can extend the pattern of the uplink reference signal and notify the user terminal of the style of the extended uplink reference signal.
  • this leads to additional overhead of signaling and waste of transmission resources.
  • a method for transmitting a signal performed by a user terminal in a communication system includes determining whether to transmit an auxiliary reference signal to a base station in a communication system according to information about a channel condition of the user terminal, and transmitting a primary reference signal to the base station, wherein the primary reference signal is used by the user terminal and Channel estimation between the base stations; and when determining to transmit the auxiliary reference signal to the base station, transmitting the auxiliary reference signal to the base station according to configuration information of the auxiliary reference signal.
  • a user terminal includes: a determining unit configured to determine whether to send an auxiliary reference signal to a base station in the communication system according to information about a channel condition of the user terminal; and a transmitting unit configured to send a primary reference signal to the base station, Wherein the primary reference signal is used for channel estimation between the user terminal and the base station; and when the determining unit determines to send an auxiliary reference signal to the base station, the transmitting unit is configured to be based on an auxiliary reference signal The configuration information is sent to the base station for the auxiliary reference signal.
  • a method for receiving a signal performed by a base station in a communication system includes detecting a reference signal of each user terminal from signals from one or more user terminals, wherein the reference signal includes a primary reference signal and/or an auxiliary reference signal; and based on the detected reference signal, The service data of each user terminal is detected in the signal.
  • a base station includes: a detecting unit configured to detect a reference signal of each user terminal from signals from one or more user terminals, wherein the reference signal includes a primary reference signal and/or an auxiliary reference signal; and the detecting The unit is further configured to detect traffic data of each user terminal from the signal based on the detected reference signal.
  • FIG. 1 is a schematic diagram of a wireless communication system in which an embodiment of the present disclosure may be applied;
  • FIG. 2 is a flowchart of a method for transmitting a signal performed by a user terminal in a communication system, in accordance with one embodiment of the present disclosure
  • FIG. 3 is a flowchart of a method for receiving a signal performed by a base station in a communication system, in accordance with one embodiment of the present disclosure
  • FIG. 4 is a flowchart of a method for a base station to detect service data of respective user terminals from received signals, according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram showing a process of detecting, by the base station, service data of each user terminal from the received signal according to the method shown in FIG. 4;
  • FIG. 6 is a schematic diagram of a process for a base station to detect service data of two user terminals from a received signal according to the method shown in FIG. 4;
  • FIG. 7 is a schematic structural diagram of a user terminal performing the method illustrated in FIG. 2 according to an embodiment of the present disclosure
  • FIG. 8 is a schematic structural diagram of a base station performing the method illustrated in FIG. 3 according to an embodiment of the present disclosure
  • FIG. 9 is a schematic diagram of a hardware structure of a user terminal or a base station in accordance with an embodiment of the present disclosure.
  • the exemplary embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings.
  • the same reference numerals are used to refer to the same elements.
  • the embodiments described herein are illustrative only and are not to be construed as limiting the scope of the disclosure.
  • the user terminals described herein may include various types of user equipments (UEs), such as mobile terminals (or mobile stations) or fixed terminals, however, for convenience, sometimes interchangeable in the following.
  • UEs user equipments
  • the UE and the mobile station are used.
  • the base station may be a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a receiving point, a femto cell, a small cell, and the like, which are not limited herein.
  • eNB eNodeB
  • the base station may be a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a receiving point, a femto cell, a small cell, and the like, which are not limited herein.
  • the wireless communication system may be an LTE system, or any other type of wireless communication system, such as an LTE-A system or a 5G system.
  • LTE-A system an LTE-A system
  • 5G system a 5G system
  • embodiments of the present disclosure are described by taking a 5G system as an example, but it should be appreciated that the following description is also applicable to other types of wireless communication systems.
  • the wireless communication system 100 can include a first user terminal 110, a second user terminal 120, and a base station (BS) 130, which are service base stations of the first user terminal 110 and the second user terminal 120. Since the number of patterns of the uplink reference signal is limited, when the first user terminal 110 and the second user terminal 120 transmit the same reference signal to the base station 130, a collision occurs between the reference signals, causing the base station 130 not to be the same. The reference signals distinguish the first user terminal 110 from the second user terminal 120. It will be appreciated that although one base station and two user terminals are shown in FIG. 1, this is merely illustrative, and the wireless communication system may also include more or fewer base stations, and/or more Or fewer user terminals. Therefore, in order to reduce the probability of collision between reference signals of different user terminals, the technical solution of the present disclosure has been proposed.
  • the uplink reference signal may include a main reference signal and/or an additional reference signal for assisting the primary reference signal.
  • the primary reference signal is a reference signal that each user terminal transmits to the base station
  • the auxiliary reference signal is a reference signal that is sent to the base station by each user terminal according to the situation.
  • FIG. 2 is a flow diagram of a method 200 for transmitting a signal performed by a user terminal in a communication system, in accordance with one embodiment of the present disclosure.
  • the "reference signal" referred to in the present disclosure may be any uplink reference signal used for channel estimation between a user terminal and a base station, for example, a Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), etc.
  • DMRS Demodulation Reference Signal
  • SRS Sounding Reference Signal
  • embodiments of the present disclosure are described with the reference signal being a DMRS as an example.
  • the user terminal determines whether to transmit an auxiliary reference signal to a base station in the communication system based on the information about the channel condition of the user terminal. For example, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is poor, the user terminal may determine to transmit the auxiliary reference signal to the base station. Conversely, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is good, the user terminal may determine not to transmit the auxiliary reference signal to the base station.
  • the auxiliary reference signal is the same type of reference signal as the main reference signal. For example, when the primary reference signal is a DMRS, the secondary reference signal is a secondary DMRS.
  • the information about the channel conditions of the user terminal may include, for example, dynamic information, which may be obtained by measuring a channel of the user terminal.
  • the dynamic information may include signal reception power information.
  • the signal reception power information may be, for example, information about Reference Signal Receiving Power (RSRP).
  • RSRP Reference Signal Receiving Power
  • the user terminal can perform real-time measurement on the downlink reference signal transmitted on the channel to obtain RSRP. Then, the user terminal can determine whether to send an auxiliary reference signal to the base station according to the RSRP.
  • the user terminal may determine not to transmit the auxiliary reference signal to the base station.
  • the user terminal can determine to transmit the auxiliary reference signal to the base station.
  • the dynamic information may further include transmission time advance information.
  • the transmission time advance information may be, for example, information about Timing Advance (TA).
  • TA Timing Advance
  • the base station can perform real-time measurement on the signal transmitted by the user terminal to the base station via the channel to obtain the TA. Then, the base station can notify the user terminal of the measured TA, so that the user terminal determines whether to send the auxiliary reference signal to the base station according to the TA.
  • TA Timing Advance
  • the user terminal may determine to send to the base station.
  • a predetermined second threshold for the TA indicating that the distance between the user terminal and the base station is large, that is, the channel condition of the user terminal is poor, and therefore, the user terminal may determine to send to the base station.
  • the measured TA is smaller than a predetermined second threshold for the TA, indicating that the distance between the user terminal and the base station is small, that is, the channel condition of the user terminal is better, and therefore, the user terminal may determine not to send to the base station.
  • the information describing the channel condition of the user terminal in step S201 above may include dynamic information.
  • the information about the channel condition of the user terminal in step S201 may further include transmission setting information of the user terminal.
  • the transmission setting information of the user terminal may be, for example, initial setting information determined by the base station for signal transmission by the user terminal, such as the number of data retransmissions or the correspondence between the number of data retransmissions and the auxiliary reference signal. Then, the user terminal may determine whether to send the auxiliary reference signal to the base station according to the number of data retransmissions or the correspondence between the number of data retransmission times and the auxiliary reference signal.
  • the user terminal may determine to transmit the auxiliary reference signal to the base station.
  • the number of data retransmissions is less than a predetermined third threshold for the number of data retransmissions, it indicates that the channel condition of the user terminal is good, and therefore, the user terminal can determine not to transmit the auxiliary reference signal to the base station.
  • the transmission setting information of the user terminal may include a correspondence between the number of data retransmissions and the auxiliary reference signal.
  • the auxiliary reference signal corresponding to the first retransmission may be the first auxiliary reference signal
  • the auxiliary reference signal corresponding to the second retransmission may be the second auxiliary reference signal.
  • the auxiliary reference signal corresponding to the third retransmission may be a third auxiliary reference signal
  • the sequence length of the second auxiliary reference signal is greater than a sequence length of the first auxiliary reference signal
  • the third auxiliary reference signal The sequence length is greater than the sequence length of the second auxiliary reference signal.
  • the information about the channel condition of the user terminal in step S201 may further include information indicating the type of the user terminal.
  • the "type of user terminal" herein may include a central user terminal and an edge user terminal.
  • the user terminal may be divided into a central user terminal and an edge user terminal according to the RSRP of the user terminal, or the user terminal may be divided into a central user terminal and an edge user terminal according to the path loss ratio of the serving cell and the interfering cell.
  • the user terminal is the central user terminal, it indicates that the channel condition of the user terminal is good, and therefore, the user terminal can determine not to send the auxiliary reference signal to the base station.
  • the user terminal is an edge user terminal, it indicates that the channel condition of the user terminal is poor, and therefore, the user terminal can determine to send an auxiliary reference signal to the base station.
  • the user terminal can determine whether to transmit assistance to the base station based on one of information (dynamic information, transmission setting information, type of user terminal) of information about its channel condition.
  • the reference signal but the user terminal can also determine whether to transmit the auxiliary reference signal to the base station based on various information (dynamic information, transmission setting information, two or three types of user terminals) in the information about its channel condition. For example, when the RSRP of the user terminal is less than a predetermined first threshold for RSRP and the user terminal is a central user terminal, the user terminal may also determine to send an auxiliary reference signal to the base station.
  • step S201 is that the user terminal determines whether to send an auxiliary reference signal to the base station according to its own channel condition.
  • the user terminal may also determine whether to transmit an auxiliary reference signal to the base station according to system performance of the communication system.
  • method 200 can also include determining, by the user terminal, whether to transmit an auxiliary reference signal to the base station based on a predetermined threshold of the communication system for the system parameter.
  • the user terminal can determine to transmit the auxiliary reference signal to the base station.
  • the system parameters of the communication system do not satisfy the predetermined threshold for the system parameters, it indicates that the system performance of the communication system is better, and therefore, the user terminal can determine not to transmit the auxiliary reference signal to the base station.
  • the predetermined threshold for the system parameters may include a threshold for system throughput, a threshold for accuracy of channel estimation, a threshold for uniformity of resources allocated according to the number of user terminals, a threshold for collision probability of reference signals One or more of the others.
  • the base station may collect information reported by one or more user terminals to determine a predetermined threshold for system parameters and broadcast a predetermined threshold for system parameters to one or more user terminals as system signaling. Accordingly, the user terminal can obtain a predetermined threshold for the system parameter by receiving system signaling of the broadcast, so that the user terminal determines whether to send the auxiliary reference signal to the base station according to a predetermined threshold regarding the system parameter.
  • the user terminal may also obtain system parameters of the communication system from system signaling from the base station, or may estimate system parameters of the communication system according to information about channel conditions of the user terminal, so that the user terminal according to system parameters of the communication system A predetermined threshold for system parameters determines whether to send an auxiliary reference signal to the base station.
  • the user terminal can determine to transmit an auxiliary reference signal to the base station.
  • the system parameters of the communication system exceed a predetermined predetermined threshold for system parameters, indicating that the system performance of the communication system is poor
  • the user terminal can determine to transmit an auxiliary reference signal to the base station.
  • the system parameters of the communication system do not exceed a predetermined threshold for the system parameters, indicating that the system performance of the communication system is good
  • the user terminal can determine not to transmit the auxiliary reference signal to the base station.
  • the user terminal may also determine whether to transmit an auxiliary reference signal to the base station according to both its own channel condition and system performance of the communication system.
  • the method 200 may further include the user terminal determining whether to transmit the auxiliary reference signal to the base station based on the information about the channel condition of the user terminal and the predetermined threshold of the communication system regarding the system parameter. For example, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is poor and the system parameter of the communication system satisfies a predetermined threshold with respect to the system parameter, the user terminal may determine to transmit the auxiliary reference signal to the base station. Conversely, when the information about the channel conditions of the user terminal indicates that the channel of the user terminal is better and the system parameters of the communication system do not satisfy the predetermined threshold for the system parameters, the user terminal may determine not to transmit the auxiliary reference signal to the base station.
  • any of the above thresholds may be obtained by the base station performing offline calculation, and then notified by the base station to the user terminal.
  • the base station can obtain an optimized value of the system performance under predetermined conditions through system simulation, and then notify the user terminal of the optimized value. Accordingly, the user terminal uses the optimized value as a threshold.
  • any of the above thresholds may be dynamically updated.
  • the base station can measure the system performance of the actual communication system, and dynamically update any of the above thresholds according to the measurement result, and notify the user terminal of the updated threshold. Accordingly, the user terminal updates the previous threshold using the updated threshold.
  • the user terminal transmits a primary reference signal to the base station, wherein the primary reference signal is used for channel estimation between the user terminal and the base station.
  • the base station can be caused to estimate a channel of the user terminal according to the primary reference signal.
  • the base station may transmit the primary reference signal and the secondary reference signal to the base station through the user terminal in step S203, which will be described below, so that the base station can estimate the channel of the user terminal according to the primary reference signal and the secondary reference signal.
  • the user terminal transmits the auxiliary reference signal to the base station according to the configuration information of the auxiliary reference signal.
  • the configuration information of the auxiliary reference signal may include, for example, at least one of information of a time-frequency resource used when transmitting the auxiliary reference signal, sequence information of the auxiliary reference signal, mapping information between the auxiliary reference signal and the main reference signal.
  • the configuration information of the auxiliary reference signal in step S203 includes the information of the time-frequency resource used when transmitting the auxiliary reference signal
  • the time-frequency resource indicated by the user terminal in the configuration information of the auxiliary reference signal Send an auxiliary reference signal on.
  • the user terminal may modulate the sequence information indicated in the configuration information of the auxiliary reference signal to generate a simulated Auxiliary reference signal.
  • the user terminal may according to the mapping information indicated in the configuration information of the auxiliary reference signal. Generate an auxiliary reference signal.
  • the "mapping information" of the present disclosure may be pattern mapping information of the auxiliary reference signal and the main reference signal, which may indicate whether the pattern of the auxiliary reference signal and the pattern of the main reference signal are in one-to-one correspondence.
  • the "mapping information" may indicate that the pattern of the auxiliary reference signal and the pattern of the main reference signal are one-to-one, or may also indicate that the pattern of the auxiliary reference signal and the pattern of the main reference signal are many-to-one.
  • the user terminal when the mapping information between the auxiliary reference signal and the main reference signal indicates that the pattern of the auxiliary reference signal and the pattern of the main reference signal are one-to-one, the user terminal may be based on the auxiliary reference signal and the main reference signal. Mapping information, obtaining an auxiliary reference signal based on the primary reference signal; and transmitting the generated secondary reference signal to the base station.
  • the mapping information between the auxiliary reference signal and the main reference signal indicates that the pattern of the auxiliary reference signal and the pattern of the main reference signal are one-to-one
  • the auxiliary reference signal may be identical to the main reference signal.
  • the orthogonal coverage code (OCC) of the user terminal corresponding to its primary reference signal and the secondary reference signal is different from the orthogonal coverage code of another user terminal, so that the two user terminals
  • the reference signals are orthogonal.
  • the OCC of one user terminal may be [1, 1], and the OCC of another user terminal may be [1, -1].
  • the OCC of one user terminal may be [1, 1, 1, 1], and the OCC of another user terminal may be [1, 1, -1, -1].
  • the OCC of one user terminal may be [1, -1, -1, 1], and the OCC of another user terminal may be [1, -1, 1, -1].
  • the OCC usage process is described by taking the OCC of one user terminal as [1, 1] and the OCC of the other user terminal as [1, -1].
  • the OCC of the first user terminal is [1, 1]
  • the sequence of the primary reference signal of the first user terminal and the sequence of the auxiliary reference signal are multiplied by the weighted value 1
  • the OCC of the second user terminal is [ 1,-1]
  • the sequence of the primary reference signal of the second user terminal is multiplied by the weighted value 1
  • the sequence of the secondary reference signal of the second user terminal is multiplied by the weighted value -1.
  • the user terminal may according to the auxiliary reference signal and the main reference signal
  • the mapping information between the two obtains a plurality of candidate reference signals.
  • a plurality of quasi-orthogonal reference signals may be determined as a plurality of candidate reference signals.
  • the user terminal may further select one reference signal from the plurality of candidate reference signals, and send the selected reference signal as the auxiliary reference signal to the base station.
  • the user terminal may select one of the plurality of candidate reference signals as the auxiliary reference signal according to a predetermined rule and transmit it to the base station.
  • the user terminal may randomly select one of the plurality of candidate reference signals as the auxiliary reference signal and transmit it to the base station.
  • the user terminal may transmit an auxiliary reference signal to the base station using a channel resource for transmitting data when the auxiliary reference signal is not transmitted to the base station according to the configuration information of the auxiliary reference signal.
  • the user terminal may send the auxiliary reference signal to the base station by using the physical uplink shared channel according to the configuration information of the auxiliary reference signal. That is, the user terminal can transmit the auxiliary reference signal using the time resource for transmitting the service data.
  • the time resource used by the user terminal to transmit the auxiliary reference signal may overlap with the time resource used by other user terminals that do not send the auxiliary reference signal to transmit the service data.
  • the time resource used by the edge user terminal to transmit the auxiliary reference signal and the time used by the central user terminal to transmit the service data Resources can be overlapping.
  • the base station can use the two as the rules for the user terminal to use the auxiliary reference signal and in a system signaling manner. Rules are broadcast to one or more user terminals. Therefore, according to an example of the present disclosure, the user terminal can obtain "configuration information of the auxiliary reference signal” and "predetermined threshold regarding the system parameter" by receiving the system signaling, thereby determining whether to transmit the auxiliary reference signal to the base station and determine the direction How the base station transmits the auxiliary reference signal to the base station when it transmits it.
  • step S202 and the step S203 described above may be performed at the same time or may not be performed at the same time, which is not limited by the disclosure.
  • the user terminal can adaptively transmit the auxiliary reference signal without the base station notifying the user terminal to send the auxiliary reference signal by signaling, thereby saving the letter. Increase overhead and increase resource utilization.
  • the user terminal since the user terminal not only transmits the primary reference signal to the base station but also transmits the auxiliary reference signal, the pattern of the reference signal is increased, the probability of collision of the reference signal is reduced, and the accuracy of the channel estimation is improved.
  • FIG. 3 is a flow diagram of a method 300 for receiving signals performed by a base station in a communication system, in accordance with one embodiment of the present disclosure. Since the method 300 is identical to the partial details of the method 200 described above with reference to FIG. 2, a detailed description of the same content is omitted herein for the sake of simplicity.
  • the base station detects a reference signal of each user terminal from signals from one or more user terminals, wherein the reference signal includes a primary reference signal and/or an auxiliary reference signal.
  • the signal received by the base station may include a reference signal of the user terminal and service data.
  • the base station may receive signals of a plurality of user terminals at the same time.
  • the base station needs to first detect the reference signals of the respective user terminals from the received signals, so as to subsequently detect the service data of each user terminal from the received signals according to the reference signals of the respective user terminals.
  • the base station may first detect the main reference signals of the respective user terminals, and then detect the auxiliary reference signals of the respective user terminals.
  • the base station when the base station detects the auxiliary reference signals of the respective user terminals, the base station can detect the respective portions of each of the auxiliary reference signals, respectively. For example, for each auxiliary reference signal, after detecting the first portion of the auxiliary reference signal, the base station can determine whether the second portion still exists, and if so, continue to detect the second portion of the auxiliary reference signal. The base station repeats the operation of determining and detecting until the respective portions of the auxiliary reference signal are detected.
  • the method 300 may further include the base station detecting user information of one or more user terminals from signals from one or more user terminals.
  • the user terminal may send the access information to the base station while transmitting the reference signal and the service data to the base station.
  • the access information is, for example, a preamble code (which may also be referred to as a preamble sequence or a random access preamble).
  • the base station can detect the user information of the user terminal according to the received preamble. By detecting the user information of the user terminal, the base station can detect the reference signal corresponding to each user terminal in step S301.
  • the method 300 may further include: the base station determining, based on the detected reference signal, whether a signal from the plurality of user terminals has collided. For example, the base station may separately determine whether the power of the auxiliary reference signal of each user terminal and the power of the primary reference signal are the same, and when the power of the auxiliary reference signal of the user terminal and the power of the primary reference signal are different, the base station may determine that the The signals of multiple user terminals have collided.
  • the primary reference signal detected by the base station is a superposition of the primary reference signals of the plurality of user terminals.
  • the auxiliary reference signals sent by the multiple user terminals are corresponding to the user information of each user terminal. Therefore, the base station can distinguish the auxiliary reference signals of the respective user terminals, that is, the base station can detect the auxiliary reference signals of the respective user terminals.
  • the power of the primary reference signal detected by the base station is the sum of the powers of the primary reference signals of the multiple user terminals
  • the base station can detect the auxiliary reference signals of the respective user terminals, and therefore, when the base station determines When the power of the auxiliary reference signal of each user terminal is the same as the power of the primary reference signal, it may be determined that the signals of the plurality of user terminals do not collide; and when the base station determines that the power of the auxiliary reference signal of the user terminal and the power of the primary reference signal exist When they are different, it can be determined that the signals of multiple user terminals have collided.
  • the base station determines whether a signal from a plurality of user terminals has collided based on the detected reference signal is given below in conjunction with Table 1.
  • Table 1 in the first case, when the base station detects the primary reference signal of the first user terminal (UE1) and does not detect the auxiliary reference signal of the first user terminal, the primary reference signal of the first user terminal The power is P A1 and the power P B of the auxiliary reference signal of the first user terminal is zero. Since the base station detects only the reference signal of the first user terminal and does not detect the reference signals of other user terminals, the base station can determine that the signal of the user terminal does not collide.
  • the base station when the base station detects the primary reference signal of the first user terminal (UE1) and the auxiliary reference signal, and the primary reference signal of the second user terminal (UE2) and the auxiliary reference signal, The base station cannot distinguish the primary reference signals of the first user terminal and the second user terminal. Therefore, the power of the primary reference signal of the first user terminal is (P A1 +P A2 ) and the power of the auxiliary reference signal of the first user terminal is P B1 , the power of the primary reference signal of the second user terminal is (P A1 +P A2 ) and the power of the auxiliary reference signal of the second user terminal is P B2 . Since (P A1 + P A2 ) ⁇ P B1 and (P A1 + P A2 ) ⁇ P B2 , the base station can determine that the signals of the first user terminal and the second user terminal have collided.
  • the base station when the base station detects the primary reference signal of the first user terminal (UE1) but does not detect the secondary reference signal of the first user terminal, and detects the second user terminal (UE2)
  • the base station cannot distinguish the primary reference signals of the first user terminal and the second user terminal, and therefore, the power of the primary reference signal of the first user terminal is (P A1 + P A2 ) and The power of the auxiliary reference signal of one user terminal is 0, the power of the primary reference signal of the second user terminal is (P A1 + P A2 ) and the power of the auxiliary reference signal of the second user terminal is P B2 . Since (P A1 + P A2 ) ⁇ 0 and (P A1 + P A2 ) ⁇ P B2 , the base station can determine that the signals of the first user terminal and the second user terminal have collided.
  • the base station detects the service data of each user terminal from the signal according to the detected reference signal. For example, when signals from a plurality of user terminals do not collide, the base station can detect the service data of each user terminal from the received signals.
  • FIG. 4 is a flow diagram of a method 400 of a base station detecting traffic data for various user terminals from received signals, in accordance with an embodiment of the present disclosure.
  • the base station may perform channel estimation using the detected primary reference signal, and detect service data of the user terminal that does not transmit the auxiliary reference signal from the received signal.
  • the base station may perform channel estimation using the detected primary reference signal to obtain channel estimation information, and then detect, from the received signal, traffic data of the user terminal that does not transmit the auxiliary reference signal according to the obtained channel estimation information.
  • the base station can detect the service data of the user terminal that does not send the auxiliary reference signal from the received signal by means of serial interference deletion, and reconstruct and delete the detected data.
  • FIG. 5 illustrates a process diagram for a base station to detect traffic data for individual user terminals from received signals in accordance with method 400.
  • the base station receives signals of (N+M) user terminals, where N and M are positive integers.
  • the (N+M) user terminals may include N user terminals (UE 1-1 , ... UE 1-N ) that do not use the auxiliary reference signal and M user terminals (UE 2-1 , using the auxiliary reference signal, ...UE 2-M ).
  • the base station may perform initial channel estimation using N primary reference signals of N user terminals that do not use the auxiliary reference signal and M primary reference signals of the user terminals that use the auxiliary reference signal to obtain N The initial estimate of the channel and the initial estimate of the M channels. Then, the base station performs minimum mean square error-serial interference on the received signal according to the initial estimated values of the N channels (CE 1_1 , ... CE 1_N ) and the initial estimated values of the M channels (CE 2_1 , ... CE 2_M ) (Minimum Mean Square Error-Successive Interference Cancellation, MMSE-SIC) processing to detect N business data of a user terminal that does not use the auxiliary reference signal.
  • minimum mean square error-serial interference on the received signal according to the initial estimated values of the N channels (CE 1_1 , ... CE 1_N ) and the initial estimated values of the M channels (CE 2_1 , ... CE 2_M ) (Minimum Mean Square Error
  • the base station may perform channel estimation using the detected auxiliary reference signal and the primary reference signal of the user terminal transmitting both the auxiliary reference signal and the primary reference signal, and detecting the transmission assistance from the received signal.
  • the service data of the user terminal of both the reference signal and the primary reference signal may be performed using the detected auxiliary reference signal and the primary reference signal of the user terminal transmitting both the auxiliary reference signal and the primary reference signal to obtain channel estimation information, and then according to the obtained channel estimation information.
  • the service data of the user terminal transmitting both the auxiliary reference signal and the main reference signal is detected from the received signal.
  • the base station may detect the service data of the user terminal that sends both the auxiliary reference signal and the primary reference signal from the received signal by means of serial interference deletion, and reconstruct and delete the detected data.
  • the base station may perform re-channel estimation using M primary reference signals and M auxiliary reference signals of the user terminals using the auxiliary reference signals to obtain M channel re-estimates. . Then, the base station performs Minimum Mean Square Error-Successive Interference Cancellation (MMSE-SIC) on the received signals according to the M channel re-estimation values (CE' 2_1 , ... CE' 2_M ). Processing to detect M business data of the user terminal using the auxiliary reference signal.
  • MMSE-SIC Minimum Mean Square Error-Successive Interference Cancellation
  • the base station detects the service data of each user terminal from the received signals.
  • the method 400 will be described again with reference to FIG. 6 taking the signal that the base station receives the two user terminals as an example.
  • 6 is a schematic diagram of a process by which a base station detects service data of two user terminals from a received signal according to method 400.
  • the first user terminal (UE_1) is a user terminal that does not use an auxiliary reference signal, and the first user terminal sends a first primary reference signal (DMRS 1) and corresponding service data to the base station; and the second user The terminal (UE_2) is a user terminal using an auxiliary reference signal, and the second user terminal transmits a second primary reference signal (DMRS 2) and an auxiliary reference signal (A-DMRS) and corresponding service data to the base station.
  • the base station receives the signals sent by the first user terminal and the second user terminal.
  • the locations of the DMRS and A-DMRS shown in FIG. 6 on time-frequency resources are merely exemplary. In other examples of the present disclosure, the locations of DMRS and A-DMRS on time-frequency resources may be arbitrarily defined.
  • the base station After receiving the signals sent by the first user terminal and the second user terminal, the base station first performs initial channel estimation according to the first primary reference signal (DMRS 1) and the second primary reference signal (DMRS 2) to obtain two channels for the first time. Estimated value (CE 1 , CE 2 ). Then, the base station detects the service data of the first user terminal from the received signal according to the initial estimated values of the two channels (CE 1 , CE 2 ), and demodulates the service data of the first user terminal to obtain demodulation. After the data.
  • DMRS 1 first primary reference signal
  • DMRS 2 second primary reference signal
  • the base station may perform channel estimation based on the second primary reference signal (DMRS 2) and the secondary reference signal (A-DMRS) to obtain a channel re-estimation value (CE' 2 ). Then, the base station detects the service data of the second user terminal from the received signal according to the channel re-estimation value (CE' 2 ). Similarly, the base station may also demodulate the service data of the second user terminal to obtain demodulated data (not shown).
  • DMRS 2 second primary reference signal
  • A-DMRS secondary reference signal
  • the base station does not need to notify the user terminal to send the auxiliary reference signal by signaling, which saves signaling overhead and improves resource utilization.
  • the base station not only receives the primary reference signal from the user terminal, but also receives the auxiliary reference signal, increases the pattern of the reference signal, reduces the probability of collision of the reference signal, and improves the accuracy of the channel estimation.
  • FIG. 7 is a schematic structural diagram of a user terminal 700 according to an embodiment of the present disclosure. Since the functions of the user terminal 700 are the same as those of the method described above with reference to FIG. 2, a detailed description of the same content is omitted herein for the sake of simplicity. As shown in FIG.
  • the user terminal 700 includes: a determining unit 710 configured to determine whether to transmit an auxiliary reference signal to a base station in a communication system according to information about a channel condition of the user terminal; and a transmitting unit 720 configured to Transmitting a primary reference signal to a base station, wherein the primary reference signal is used for channel estimation between the user terminal and the base station; and when the determining unit 710 determines to transmit an auxiliary reference signal to the base station, the transmitting Unit 720 is configured to transmit the auxiliary reference signal to a base station based on configuration information of the auxiliary reference signal.
  • the user terminal 700 may include other components in addition to these two units, however, since these components are not related to the contents of the embodiments of the present disclosure, illustration and description thereof are omitted herein.
  • the determining unit 710 determines whether to transmit the auxiliary reference signal to the base station based on the information about the channel condition of the user terminal. For example, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is poor, the determining unit 710 may determine to transmit the auxiliary reference signal to the base station. Conversely, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is good, the determining unit 710 may determine not to transmit the auxiliary reference signal to the base station.
  • the information about the channel conditions of the user terminal may include, for example, dynamic information, which may be obtained by measuring a channel of the user terminal.
  • the dynamic information may include signal reception power information.
  • the signal reception power information may be, for example, information about Reference Signal Receiving Power (RSRP).
  • RSRP Reference Signal Receiving Power
  • the user terminal can perform real-time measurement on the downlink reference signal transmitted on the channel to obtain RSRP. Then, the determining unit 710 can determine whether to send the auxiliary reference signal to the base station according to the RSRP.
  • the dynamic information may further include transmission time advance information.
  • the transmission time advance information may be, for example, information about Timing Advance (TA).
  • TA Timing Advance
  • the base station can perform real-time measurement on the signal transmitted by the user terminal to the base station via the channel to obtain the TA. Then, the base station can notify the user terminal of the measured TA, so that the determining unit 710 determines whether to transmit the auxiliary reference signal to the base station according to the TA.
  • TA Timing Advance
  • the information about the channel condition of the user terminal may further include transmission setting information of the user terminal.
  • the transmission setting information of the user terminal may be, for example, initial setting information determined by the base station for signal transmission by the user terminal, such as the number of data retransmissions or the correspondence between the number of data retransmissions and the auxiliary reference signal. Then, the determining unit 710 may determine whether to send the auxiliary reference signal to the base station according to the number of data retransmissions or the correspondence between the number of data retransmissions and the auxiliary reference signal.
  • the information about the channel condition of the user terminal may further include the type of the user terminal.
  • the determining unit 710 may determine not to send the auxiliary reference signal to the base station.
  • the determining unit 710 may determine to transmit the auxiliary reference signal to the base station.
  • the determining unit 710 determines whether or not to transmit an auxiliary reference signal to the base station based on the information about the channel condition of the user terminal. It should be understood that the determining unit 710 determines whether to transmit an auxiliary reference signal to the base station according to its own channel condition. However, the present disclosure is not limited thereto. According to another example of the present disclosure, the determining unit 710 may also determine whether to transmit an auxiliary reference signal to the base station according to system performance of the communication system. For example, the determining unit 710 determines whether to transmit an auxiliary reference signal to the base station according to a predetermined threshold of the communication system regarding the system parameter.
  • the determination unit 710 can determine to transmit an auxiliary reference signal to the base station.
  • the determining unit 710 can determine not to transmit the auxiliary reference signal to the base station.
  • the predetermined threshold for the system parameters may include a threshold for system throughput, a threshold for accuracy of channel estimation, a threshold for uniformity of resources allocated according to the number of user terminals, a threshold for collision probability of reference signals One or more of the others.
  • the base station may collect information reported by one or more user terminals to determine a predetermined threshold for system parameters and broadcast a predetermined threshold for system parameters to one or more user terminals as system signaling. Accordingly, the user terminal can obtain a predetermined threshold for the system parameter by receiving system signaling of the broadcast, so that the user terminal determines whether to send the auxiliary reference signal to the base station according to a predetermined threshold regarding the system parameter.
  • the user terminal may also obtain system parameters of the communication system from system signaling from the base station, or may estimate system parameters of the communication system according to information about channel conditions of the user terminal, so that the determining unit 710 determines system parameters according to the communication system.
  • a predetermined threshold is determined with respect to the system parameters to determine whether to send an auxiliary reference signal to the base station.
  • the determining unit 710 may also determine whether to transmit an auxiliary reference signal to the base station according to both its own channel condition and system performance of the communication system. For example, the determining unit 710 determines whether to transmit the auxiliary reference signal to the base station based on the information about the channel condition of the user terminal and the predetermined threshold of the communication system regarding the system parameter. For example, when the information about the channel condition of the user terminal indicates that the channel of the user terminal is poor and the system parameter of the communication system satisfies a predetermined threshold regarding the system parameter, the determining unit 710 may determine to transmit the auxiliary reference signal to the base station.
  • the determining unit 710 may determine not to transmit the auxiliary reference signal to the base station.
  • the configuration information of the auxiliary reference signal may include, for example, at least one of information of a time-frequency resource used when transmitting the auxiliary reference signal, sequence information of the auxiliary reference signal, mapping information between the auxiliary reference signal and the main reference signal.
  • the transmitting unit 720 may be based on the auxiliary reference signal and the main reference signal.
  • the mapping information between the two, the auxiliary reference signal is obtained based on the primary reference signal; and the generated auxiliary reference signal is transmitted to the base station.
  • the auxiliary reference signal may be identical to the main reference signal.
  • the transmitting unit 720 may according to the auxiliary reference signal and the main reference signal.
  • the mapping information between the two obtains a plurality of candidate reference signals.
  • a plurality of quasi-orthogonal reference signals may be determined as a plurality of candidate reference signals.
  • the transmitting unit 720 may further select one reference signal from the plurality of candidate reference signals, and send the selected reference signal as the auxiliary reference signal to the base station.
  • the transmitting unit 720 may select one of the plurality of candidate reference signals as the auxiliary reference signal according to a predetermined rule and transmit it to the base station.
  • the transmitting unit 720 may randomly select one of the plurality of candidate reference signals as the auxiliary reference signal and transmit it to the base station.
  • the transmitting unit 720 may transmit an auxiliary reference signal to the base station using a channel resource for transmitting data when the auxiliary reference signal is not transmitted to the base station according to the configuration information of the auxiliary reference signal.
  • the sending unit 720 can send the auxiliary reference signal to the base station by using the physical uplink shared channel according to the configuration information of the auxiliary reference signal. That is, the transmitting unit 720 can transmit the auxiliary reference signal using the time resource for transmitting the service data.
  • the time resource used by the transmitting unit 720 to transmit the auxiliary reference signal may overlap with the time resource used by the user terminal that does not send the auxiliary reference signal to transmit the service data.
  • the time resource used by the edge user terminal to transmit the auxiliary reference signal and the time used by the central user terminal to transmit the service data Resources can be overlapping.
  • the user terminal in this embodiment can adaptively transmit the auxiliary reference signal, without requiring the base station to notify the user terminal to send the auxiliary reference signal by signaling, thereby saving signaling overhead and improving resource utilization.
  • the user terminal since the user terminal not only transmits the primary reference signal to the base station but also transmits the auxiliary reference signal, the pattern of the reference signal is increased, the probability of collision of the reference signal is reduced, and the accuracy of the channel estimation is improved.
  • FIG. 8 is a block diagram showing the structure of a base station 800 according to an embodiment of the present disclosure. Since the functions of the base station 800 are the same as those of the method described above with reference to FIGS. 3-5, a detailed description of the same content is omitted herein for the sake of simplicity.
  • the base station 800 includes: a detecting unit 810 configured to detect reference signals of respective user terminals from signals from one or more user terminals, wherein the reference signals include primary reference signals and/or auxiliary a reference signal; and the detecting unit 810 is further configured to detect service data of each user terminal from the signal according to the detected reference signal.
  • the base station 800 may include other components in addition to this unit, however, since these components are not related to the content of the embodiments of the present disclosure, illustration and description thereof are omitted herein.
  • the base station 800 may further include a receiving unit 820 configured to receive signals from the user terminal, such as reference signals of the user terminal and traffic data.
  • the receiving unit 820 may receive signals of the plurality of user terminals at the same time.
  • the detecting unit 810 needs to first detect the reference signals of the respective user terminals from the received signals, so as to subsequently detect the service data of each user terminal from the received signals according to the reference signals of the respective user terminals.
  • the detecting unit 810 may first detect the main reference signals of the respective user terminals, and then detect the auxiliary reference signals of the respective user terminals.
  • the detecting unit 810 can detect the respective portions of each of the auxiliary reference signals, respectively. For example, for each auxiliary reference signal, after detecting the first portion of the auxiliary reference signal, the detecting unit 810 can determine whether the second portion still exists, and if so, continue to detect the second portion of the auxiliary reference signal.
  • the detecting unit 810 repeats the operations of determining and detecting until the respective portions of the auxiliary reference signal are detected.
  • the detecting unit 810 may detect user information of one or more user terminals from signals from one or more user terminals.
  • the user terminal may send the access information to the base station while transmitting the reference signal and the service data to the base station.
  • the access information is, for example, a preamble code (which may also be referred to as a preamble sequence or a random access preamble).
  • the base station can detect the user information of the user terminal according to the received preamble.
  • the detecting unit 810 can detect a reference signal corresponding to each user terminal.
  • the detecting unit 810 may determine whether a signal from a plurality of user terminals has collided based on the detected reference signal. For example, the detecting unit 810 can respectively determine whether the power of the auxiliary reference signal of each user terminal and the power of the main reference signal are the same, and when the power of the auxiliary reference signal of the user terminal and the power of the main reference signal are different, the detecting unit 810 can determine that signals from multiple user terminals have collided.
  • the primary reference signal detected by the base station is a superposition of the primary reference signals of the plurality of user terminals.
  • the auxiliary reference signals sent by the multiple user terminals are corresponding to the user information of each user terminal. Therefore, the base station can distinguish the auxiliary reference signals of the respective user terminals, that is, the base station can detect the auxiliary reference signals of the respective user terminals.
  • the power of the primary reference signal detected by the base station is the sum of the powers of the primary reference signals of the multiple user terminals
  • the base station can detect the auxiliary reference signals of the respective user terminals, and therefore, when the base station determines When the power of the auxiliary reference signal of each user terminal is the same as the power of the primary reference signal, it may be determined that the signals of the plurality of user terminals do not collide; and when the base station determines that the power of the auxiliary reference signal of the user terminal and the power of the primary reference signal exist When they are different, it can be determined that the signals of multiple user terminals have collided.
  • the detecting unit 810 detects the service data of each user terminal from the signal according to the detected reference signal. For example, when signals from a plurality of user terminals do not collide, the detecting unit 810 can detect the service data of each user terminal from the received signals.
  • the detecting unit 810 can perform channel estimation using the detected primary reference signal, and detect, from the received signal, traffic data of the user terminal that does not transmit the auxiliary reference signal.
  • the detecting unit 810 may perform channel estimation using the detected primary reference signal to obtain channel estimation information, and then detect a service of the user terminal that does not transmit the auxiliary reference signal from the received signal according to the obtained channel estimation information. data.
  • the detecting unit 810 can detect the service data of the user terminal that does not send the auxiliary reference signal from the received signal by means of serial interference deletion, and reconstruct and delete the detected data.
  • the detecting unit 810 may perform channel estimation using the detected auxiliary reference signal and the main reference signal of the user terminal that transmit both the auxiliary reference signal and the main reference signal, and detect the transmitting auxiliary reference signal from the received signal and The service data of the user terminal of both the primary reference signals.
  • the detecting unit 810 may perform channel estimation using the detected auxiliary reference signal and the primary reference signal of the user terminal transmitting both the auxiliary reference signal and the primary reference signal to obtain channel estimation information, and then according to the obtained channel.
  • the estimation information detects, from the received signal, the service data of the user terminal that transmits both the auxiliary reference signal and the primary reference signal.
  • the detecting unit 810 may detect the service data of the user terminal that sends the auxiliary reference signal and the main reference signal from the received signal by means of serial interference deletion, and reconstruct and delete the detected data. .
  • the base station in this embodiment does not need to notify the user terminal to send an auxiliary reference signal by signaling, which saves signaling overhead and improves resource utilization.
  • the base station not only receives the primary reference signal from the user terminal, but also receives the auxiliary reference signal, increases the pattern of the reference signal, reduces the probability of collision of the reference signal, and improves the accuracy of the channel estimation.
  • each functional block may be implemented by one device that is physically and/or logically combined, or two or more devices that are physically and/or logically separated, directly and/or indirectly (eg, This is achieved by a plurality of devices as described above by a wired and/or wireless connection.
  • a device such as a first communication device, a second communication device, or a flight user terminal, etc.
  • a device may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • 9 is a schematic diagram of a hardware structure of a device 900 (base station or user terminal) involved, in accordance with an embodiment of the present disclosure.
  • the above-described device 900 can be configured as a computer device that physically includes a processor 910, a memory 920, a memory 930, a communication device 940, an input device 950, an output device 960, a bus 970, and the like.
  • the hardware structure of the user terminal 700 and the base station 800 may include one or more of the devices shown in the figures, or may not include some of the devices.
  • processor 910 is only illustrated as one, but may be multiple processors.
  • the processing may be performed by one processor, or may be performed by one or more processors simultaneously, sequentially, or by other methods.
  • the processor 910 can be installed by more than one chip.
  • Each function of the device 900 is realized, for example, by reading a predetermined software (program) into hardware such as the processor 910 or the memory 920, thereby causing the processor 910 to perform an operation to control communication by the communication device 940. And controlling the reading and/or writing of data in the memory 920 and the memory 930.
  • a predetermined software program
  • the processor 910 causes the operating system to operate to control the entire computer.
  • the processor 910 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the above determining unit, adjusting unit, and the like may be implemented by the processor 910.
  • the processor 910 reads out programs (program codes), software modules, data, and the like from the memory 930 and/or the communication device 940 to the memory 920, and executes various processes in accordance therewith.
  • programs program codes
  • the program a program for causing a computer to execute at least a part of the operations described in the above embodiments can be employed.
  • the determining unit of the user terminal 500 can be implemented by a control program stored in the memory 920 and operated by the processor 910, and can be similarly implemented for other functional blocks.
  • the memory 920 is a computer readable recording medium, and may be, for example, a read only memory (ROM), an EEPROM (Erasable Programmable ROM), an electrically programmable read only memory (EEPROM), or an electrically programmable read only memory (EEPROM). At least one of a random access memory (RAM) and other suitable storage medium is used.
  • the memory 920 may also be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the memory 920 can store an executable program (program code), a software module, and the like for implementing the method of one embodiment of the present disclosure.
  • the memory 930 is a computer readable recording medium, and may be, for example, a flexible disk, a soft (registered trademark) disk (floppy disk), a magneto-optical disk (for example, a CD-ROM (Compact Disc ROM), etc.). Digital Versatile Disc, Blu-ray (registered trademark) disc, removable disk, hard drive, smart card, flash device (eg card, stick, key driver), magnetic stripe, database At least one of a server, a server, and other suitable storage medium. Memory 930 may also be referred to as an auxiliary storage device.
  • the communication device 940 is hardware (transmission and reception device) for performing communication between computers through a wired and/or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, and the like, for example.
  • the communication device 940 may include a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement, for example, Frequency Division Duplex (FDD) and/or Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the above-described transmitting unit, receiving unit, and the like can be implemented by the communication device 940.
  • the input device 950 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
  • the output device 960 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs an output to the outside.
  • the input device 950 and the output device 960 may also be an integrated structure (for example, a touch panel).
  • each device such as the processor 910, the memory 920, and the like are connected by a bus 970 for communicating information.
  • the bus 970 may be composed of a single bus or a different bus between devices.
  • the base station 800 and the user terminal 700 may include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD, Programmable Logic Device), Hardware such as Field Programmable Gate Array (FPGA) can realize some or all of each functional block by this hardware.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA Field Programmable Gate Array
  • processor 910 can be installed by at least one of these hardware.
  • the channel and/or symbol can also be a signal (signaling).
  • the signal can also be a message.
  • the reference signal may also be simply referred to as an RS (Reference Signal), and may also be referred to as a pilot (Pilot), a pilot signal, or the like according to applicable standards.
  • a component carrier may also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.
  • the information, parameters, and the like described in the present specification may be expressed by absolute values, may be represented by relative values with predetermined values, or may be represented by other corresponding information.
  • wireless resources can be indicated by a specified index.
  • the formula or the like using these parameters may be different from those explicitly disclosed in the present specification.
  • the information, signals, and the like described in this specification can be expressed using any of a variety of different techniques.
  • data, commands, instructions, information, signals, bits, symbols, chips, etc. which may be mentioned in all of the above description, may pass voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of them. Combined to represent.
  • information, signals, and the like may be output from the upper layer to the lower layer, and/or from the lower layer to the upper layer.
  • Information, signals, etc. can be input or output via a plurality of network nodes.
  • Information or signals input or output can be stored in a specific place (such as memory) or managed by a management table. Information or signals input or output may be overwritten, updated or supplemented. The output information, signals, etc. can be deleted. The input information, signals, etc. can be sent to other devices.
  • the notification of the information is not limited to the mode/embodiment described in the specification, and may be performed by other methods.
  • the notification of the information may be through physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and upper layer signaling (for example, radio resource control).
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • MAC Media Access Control
  • the physical layer signaling may be referred to as L1/L2 (Layer 1/Layer 2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
  • the RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
  • the MAC signaling can be notified, for example, by a MAC Control Unit (MAC CE).
  • MAC CE MAC Control Unit
  • the notification of the predetermined information is not limited to being explicitly performed, and may be performed implicitly (for example, by not notifying the predetermined information or by notifying the other information).
  • the determination can be performed by a value (0 or 1) represented by 1 bit, or by a true or false value (boolean value) represented by true (true) or false (false), and can also be compared by numerical values ( For example, comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, should be interpreted broadly to mean commands, command sets, code, code segments, program code, programs, sub- Programs, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, steps, functions, and the like.
  • software, commands, information, and the like may be transmitted or received via a transmission medium.
  • a transmission medium For example, when using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) from a website, server, or other remote source
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • base station (BS, Base Station)", “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier”, and “component carrier”
  • BS Base Station
  • radio base station eNB
  • gNB gNodeB
  • cell a cell
  • cell group a carrier
  • component carrier a component carrier
  • the base station is sometimes referred to by a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femto cell, a small cell, and the like.
  • a base station can accommodate one or more (eg, three) cells (also referred to as sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also pass through the base station subsystem (for example, a small indoor base station (RFH, remote head (RRH), Remote Radio Head))) to provide communication services.
  • the term "cell” or “sector” refers to a portion or the entirety of the coverage area of a base station and/or base station subsystem that performs communication services in the coverage.
  • Mobile stations are also sometimes used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless Terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms are used.
  • the wireless base station in this specification can also be replaced with a user terminal.
  • each mode/embodiment of the present disclosure can also be applied to a configuration in which communication between a wireless base station and a user terminal is replaced with communication between a plurality of user-to-device (D2D) devices.
  • D2D user-to-device
  • the functions of the first communication device or the second communication device in the above-described device 900 can be regarded as functions of the user terminal.
  • words such as "upstream” and "downstream” can also be replaced with "side”.
  • the uplink channel can also be replaced with a side channel.
  • the user terminal in this specification can also be replaced with a wireless base station.
  • the function of the above-described user terminal can be regarded as a function of the first communication device or the second communication device.
  • the node may be considered, for example, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW, etc.), or a combination thereof.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • LTE-B Long-Term Evolution
  • LTE-Beyond Long-Term Evolution
  • Super 3rd generation mobile communication system SUPER 3G
  • IMT-Advanced advanced international mobile communication
  • 4th generation mobile communication system (4G, 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • future radio access FAA
  • new radio access technology New-RAT, Radio Access Technology
  • NR New Radio Access Technology
  • NX new radio access
  • FX Next Generation Wireless Access
  • GSM Registered trademark
  • GSM Global System for Mobile Communications
  • UMB Ultra Mobile Broadband
  • IEEE 920.11 Wi-Fi (registered trademark)
  • IEEE 920.16 WiMAX (registered trademark)
  • IEEE 920.20 Ultra Wideband
  • any reference to a unit using the names "first”, “second”, etc., as used in this specification, does not fully limit the number or order of the units. These names can be used in this specification as a convenient method of distinguishing between two or more units. Thus, reference to a first element and a second element does not mean that only two elements may be employed or that the first element must prevail in the form of the second unit.
  • determination used in the present specification sometimes includes various actions. For example, regarding “judgment (determination)", calculation, calculation, processing, deriving, investigating, looking up (eg, table, database, or other) may be performed. Search in the data structure, ascertaining, etc. are considered to be “judgment (determination)”. Further, regarding “judgment (determination)”, reception (for example, receiving information), transmission (for example, transmission of information), input (input), output (output), and access (for example) may also be performed (for example, Accessing data in memory, etc. is considered to be “judgment (determination)”.
  • judgment (determination) it is also possible to consider “resolving”, “selecting”, selecting (choosing), establishing (comparing), comparing (comparing), etc. as “judging (determining)”. That is to say, regarding "judgment (determination)", several actions can be regarded as performing "judgment (determination)".
  • connection means any direct or indirect connection or combination between two or more units, This includes the case where there is one or more intermediate units between two units that are “connected” or “coupled” to each other.
  • the combination or connection between the units may be physical, logical, or a combination of the two.
  • connection can also be replaced with "access”.
  • two units may be considered to be electrically connected by using one or more wires, cables, and/or printed, and as a non-limiting and non-exhaustive example by using a radio frequency region.
  • the electromagnetic energy of the wavelength of the region, the microwave region, and/or the light is "connected” or "bonded” to each other.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

本公开提供了一种用于传输信号的方法及相应的用户终端、基站，其中用于发送信号的方法由通信系统中的用户终端执行。该方法包括：根据关于用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；向基站发送主参考信号，其中主参考信号用于用户终端与基站之间的信道估计；以及当确定向基站发送辅助参考信号时，根据辅助参考信号的配置信息向基站发送所述辅助参考信号。

Description

用于传输信号的方法及相应的用户终端、基站 技术领域
本公开涉及移动通信领域，并且更具体地涉及一种用于传输信号的方法及相应的用户终端、基站。
背景技术
为了减小信令开销，已经提出了在机器型通信(Machine Type Communication，MTC)系统中采用免授权的上行链路来进行信息传输。在这种传输方式下，用户终端不需要基站的授权就可以向基站发送信息。因此，多个用户终端可能同时向基站发送信息。
在MTC系统中，用户终端向基站发送上行参考信号，例如解调参考信号(Demodulation Reference Signal，DMRS)，以使得基站根据上行参考信号进行信道估计从而对用户终端发送的信息进行检测解调。然而，由于上行参考信号的样式数量是有限的，因此，多个用户终端可能选择了相同的上行参考信号。因此，存在多个用户终端同时向基站发送相同的上行参考信号的情形。在这种情形下，多个用户终端发送的上行参考信号发生碰撞，造成了多个用户终端之间的干扰，降低了通信系统的系统性能。
为了减少上行参考信号之间的碰撞，已经提出了基站对上行参考信号的样式进行扩展的方法。在该方法中，基站可以扩展上行参考信号的样式，并且将扩展后的上行参考信号的样式通知给用户终端。然而，这导致了信令的额外开销以及传输资源的浪费。
发明内容
根据本公开的一个方面，提供了一种由通信系统中的用户终端执行的用于发送信号的方法。该方法包括：根据关于所述用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；向所述基站发送主参考信号，其中所述主参考信号用于所述用户终端与所述基站之间的信道估计；以及当确定向所述基站发送辅助参考信号时，根据辅助参考信号的配置信息向基站发送所述辅助参考信号。
根据本公开的另一方面，提供了一种用户终端。该用户终端包括：确定单元，被配置为根据关于所述用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；发送单元，被配置为向所述基站发送主参考信号，其中所述主参考信号用于所述用户终端与所述基站之间的信道估计；以及当所述确定单元确定向所述基站发送辅助参考信号时，所述发送单元被配置为根据辅助参考信号的配置信息向基站发送所述辅助参考信号。
根据本公开的另一方面，提供了一种由通信系统中的基站执行的用于接收信号的方法。该方法包括：从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号；以及根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。
根据本公开的另一方面，提供了一种基站。该基站包括：检测单元，被配置为从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号；以及所述检测单元还被配置为根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。
附图说明
通过结合附图对本公开实施例进行更详细的描述，本公开的上述以及其它目的、特征和优势将变得更加明显。附图用来提供对本公开实施例的进一步理解，并且构成说明书的一部分，与本公开实施例一起用于解释本公开，并不构成对本公开的限制。在附图中，相同的参考标号通常代表相同部件或步骤。
图1是可以在其中应用本公开实施例的无线通信系统的示意图；
图2是根据本公开的一个实施例的由通信系统中的用户终端执行的用于发送信号的方法的流程图；
图3是根据本公开的一个实施例的由通信系统中的基站执行的用于接收信号的方法的流程图；
图4是根据本公开的一个实施例的基站从所接收的信号中检测各个用户终端的业务数据的方法的流程图；
图5示出了基站根据图4所示的方法从所接收的信号中检测各个用户终端的业务数据的过程示意图；
图6是基站根据图4所示的方法从所接收的信号中检测两个用户终端的业务数据的过程示意图；
图7是根据本公开的一个实施例的执行图2所示的方法的用户终端的结构示意图；
图8是根据本公开的一个实施例的执行图3所示的方法的基站的结构示意图；
图9是根据本公开的实施例的所涉及的用户终端或基站的硬件结构的示意图。
具体实施方式
为了使得本公开的目的、技术方案和优点更为明显，下面将参照附图详细描述根据本公开的示例实施例。在附图中，相同的参考标号自始至终表示相同的元件。应当理解：这里描述的实施例仅仅是说明性的，而不应被解释为限制本公开的范围。此外，这里所述的用户终端可以包括各种类型的用户终端(User Equipment，UE)，例如移动终端(或称为移动台)或者固定终端，然而，为方便起见，在下文中有时候可互换地使用UE和移动台。此外，基站可以为固定台(fixed station)、NodeB、eNodeB(eNB)、接入点(access point)、发送点、接收点、毫微微小区、小小区等，在此不做限定。
首先，参照图1来描述可以在其中应用本公开实施例的无线通信系统的示意图。该无线通信系统可以是LTE系统，也可以是任何其他类型的无线通信系统，比如LTE-A系统或5G系统等。在下文中，以5G系统为例来描述本公开的实施例，但应当认识到，以下描述也可以适用于其他类型的无线通信系统。
如图1所示，无线通信系统100可以包括第一用户终端110、第二用户终端120以及基站(BS)130，该基站130是第一用户终端110和第二用户终端120的服务基站。由于上行参考信号的样式数量是有限的，因此，当第一用户终端110和第二用户终端120向基站130发送相同的参考信号时，参考信号之间发生了碰撞，导致基站130无法根据该相同的参考信号区分第一 用户终端110和第二用户终端120。需要认识到，尽管在图1中示出了1个基站和两个用户终端，但这只是示意性的，该无线通信系统还可以包括更多个或更少个基站，和/或更多个或更少个用户终端。因此，为了降低不同用户终端的参考信号之间发生碰撞的概率，提出了本公开的技术方案。
在本公开中，上行参考信号可以包括主(main)参考信号和/或用于辅助主参考信号的辅助(additional)参考信号。主参考信号是每个用户终端均向基站发送的参考信号，而辅助参考信号是每个用户终端依情形确定的向基站发送的参考信号。通过引入辅助参考信号，对上行参考信号的样式进行了扩展，从而可以降低上行参考信号之间发生碰撞的概率。
以下，参照图2来描述根据本公开实施例的由通信系统中的用户终端执行的用于发送信号的方法。图2是根据本公开的一个实施例的由通信系统中的用户终端执行的用于发送信号的方法200的流程图。
根据本公开的一个示例，本公开所提到的“参考信号”可以是用于用户终端与基站之间的信道估计的任何上行参考信号，例如，解调参考信号(Demodulation Reference Signal，DMRS)、探测参考信号(Sounding Reference Signal，SRS)等。在下面的示例中，以“参考信号”是DMRS为例来描述本公开的实施例。
如图2所示，在步骤S201中，用户终端根据关于用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号。例如，当关于用户终端的信道条件的信息指示用户终端的信道较差时，用户终端可以确定向基站发送辅助参考信号。相反地，当关于用户终端的信道条件的信息指示用户终端的信道较好时，用户终端可以确定不向基站发送辅助参考信号。辅助参考信号为与主参考信号相同类型的参考信号。例如，当主参考信号为DMRS时，辅助参考信号为辅助DMRS。
关于用户终端的信道条件的信息例如可以包括动态信息，该动态信息可以是通过对用户终端的信道进行测量而获得的。根据本公开的一个示例，动态信息可以包括信号接收功率信息。信号接收功率信息例如可以是关于参考信号接收功率(Reference Signal Receiving Power，RSRP)的信息。例如，用户终端可以对在信道上传输的下行参考信号进行实时测量而获得RSRP。然后，用户终端可以根据RSRP确定是否向基站发送辅助参考信号。
例如，当所测量的RSRP大于或等于预先确定的关于RSRP的第一阈值时，表明用户终端的信道条件较好，因此，用户终端可以确定不向基站发送辅助参考信号。相反地，当所测量的RSRP小于预先确定的关于RSRP的第一阈值时，表明用户终端的信道条件较差，因此，用户终端可以确定向基站发送辅助参考信号。
此外，根据本公开的另一示例，动态信息还可以包括传输时间提前信息。传输时间提前信息例如可以是关于定时提前(Timing Advance，TA)的信息。例如，基站可以对用户终端经由信道向基站发送的信号进行实时测量而获得TA。然后，基站可以将所测量的TA通知给用户终端，以便用户终端根据TA确定是否向基站发送辅助参考信号。
例如，当所测量的TA大于或等于预先确定的关于TA的第二阈值时，表明用户终端与基站之间的距离较大，即用户终端的信道条件较差，因此，用户终端可以确定向基站发送辅助参考信号。相反地，当所测量的TA小于预先确定的关于TA的第二阈值时，表明用户终端与基站之间的距离较小，即用户终端的信道条件较好，因此，用户终端可以确定不向基站发送辅助参考信号。
上面描述了步骤S201中的关于用户终端的信道条件的信息可以包括动态信息。根据本公开的另一示例，步骤S201中的关于用户终端的信道条件的信息还可以包括用户终端的传输设置信息。用户终端的传输设置信息例如可以是基站为用户终端进行信号传输而确定的初始设置信息，比如数据重传次数或数据重传次数与辅助参考信号的对应关系。然后，用户终端可以根据数据重传次数或数据重传次数与辅助参考信号的对应关系确定是否向基站发送辅助参考信号。
例如，当数据重传次数大于或等于预先确定的关于数据重传次数的第三阈值时，表明用户终端的信道条件较差，因此，用户终端可以确定向基站发送辅助参考信号。相反地，当数据重传次数小于预先确定的关于数据重传次数的第三阈值时，表明用户终端的信道条件较好，因此，用户终端可以确定不向基站发送辅助参考信号。
此外，用户终端的传输设置信息可以包括数据重传次数与辅助参考信号的对应关系。例如，当重传次数为3时，与第一次重传相对应的辅助参考信 号可以为第一辅助参考信号，与第二次重传相对应的辅助参考信号可以为第二辅助参考信号，与第三次重传相对应的辅助参考信号可以为第三辅助参考信号，并且所述第二辅助参考信号的序列长度大于所述第一辅助参考信号的序列长度、所述第三辅助参考信号的序列长度大于所述第二辅助参考信号的序列长度。
另外，根据本公开的另一示例，步骤S201中的关于用户终端的信道条件的信息还可以包括指示用户终端的类型的信息。这里的“用户终端的类型”可以包括中心用户终端和边缘用户终端。可以根据用户终端的RSRP将用户终端划分为中心用户终端和边缘用户终端，或者也可以根据用户终端对服务小区和干扰小区的路径损耗比值将用户终端划分为中心用户终端和边缘用户终端。当用户终端为中心用户终端时，表明用户终端的信道条件较好，因此，用户终端可以确定不向基站发送辅助参考信号。相反地，当用户终端为边缘用户终端时，表明用户终端的信道条件较差，因此，用户终端可以确定向基站发送辅助参考信号。
应该理解，虽然在上述示例中，描述了用户终端可以根据关于其信道条件的信息中的一种信息(动态信息、传输设置信息、用户终端的类型中的一种)来确定是否向基站发送辅助参考信号，但是用户终端也可以根据关于其信道条件的信息中的多种信息(动态信息、传输设置信息、用户终端的类型中的两种或三种)来确定是否向基站发送辅助参考信号。例如，当用户终端的RSRP小于预先确定的关于RSRP的第一阈值且该用户终端为中心用户终端时，用户终端也可以确定向基站发送辅助参考信号。
至此，已经描述了用户终端在步骤S201中根据关于用户终端的信道条件的信息确定是否向基站发送辅助参考信号。应该理解，步骤S201是用户终端根据自身的信道条件来确定是否向基站发送辅助参考信号。然而本公开不限于此。根据本公开的另一示例，用户终端还可以根据通信系统的系统性能来确定是否向基站发送辅助参考信号。例如，方法200还可以包括：用户终端根据通信系统的关于系统参数的预定阈值确定是否向基站发送辅助参考信号。比如，当通信系统的系统参数满足关于系统参数的预定阈值时，表明通信系统的系统性能较差，因此，用户终端可以确定向基站发送辅助参考信号。相反地，当通信系统的系统参数不满足关于系统参数的预定阈值时， 表明通信系统的系统性能较好，因此，用户终端可以确定不向基站发送辅助参考信号。
在该示例中，关于系统参数的预定阈值可以包括关于系统吞吐量的阈值、关于信道估计的准确性的阈值、关于根据用户终端的数量分配资源的均匀性的阈值、关于参考信号碰撞概率的阈值等中的一个或多个。基站可以收集一个或多个用户终端上报的信息来确定关于系统参数的预定阈值，并将关于系统参数的预定阈值作为系统信令广播给一个或多个用户终端。相应地，用户终端可以通过接收该广播的系统信令获得关于系统参数的预定阈值，以便用户终端根据关于系统参数的预定阈值确定是否向基站发送辅助参考信号。
此外，用户终端还可以从来自基站的系统信令获得通信系统的系统参数，或者可以根据关于用户终端的信道条件的信息来估测通信系统的系统参数，以便用户终端根据通信系统的系统参数与关于系统参数的预定阈值确定是否向基站发送辅助参考信号。
例如，当通信系统的系统参数超过预先定义的关于系统参数的预定阈值时，表明通信系统的系统性能较差，因此，用户终端可以确定向基站发送辅助参考信号。相反地，当通信系统的系统参数不超过预先定义的关于系统参数的预定阈值时，表明通信系统的系统性能较好，因此，用户终端可以确定不向基站发送辅助参考信号。
另外，根据本公开的另一示例，用户终端也可以根据自身的信道条件以及通信系统的系统性能二者来确定是否向基站发送辅助参考信号。例如，方法200还可以包括：用户终端根据关于用户终端的信道条件的信息以及通信系统的关于系统参数的预定阈值确定是否向基站发送辅助参考信号。比如，当关于用户终端的信道条件的信息指示用户终端的信道较差且通信系统的系统参数满足关于系统参数的预定阈值时，用户终端可以确定向基站发送辅助参考信号。相反地，当关于用户终端的信道条件的信息指示用户终端的信道较好且通信系统的系统参数不满足关于系统参数的预定阈值时，用户终端可以确定不向基站发送辅助参考信号。
根据本公开的一个示例，上述任一阈值可以是基站进行离线计算而获得、然后由基站通知用户终端的。例如，基站可以通过系统仿真获得在预定条件下系统性能最佳的优化值，然后将该优化值通知给用户终端。相应地，用户 终端将该优化值作为阈值。
根据本公开的另一示例，上述任一阈值可以被动态地更新的。例如，基站可以通过对实际的通信系统的系统性能进行测量，并根据测量结果动态地更新上述任一阈值，并将更新后的阈值通知给用户终端。相应地，用户终端使用更新后的阈值更新先前的阈值。然后，在步骤S202中，用户终端向基站发送主参考信号，其中主参考信号用于用户终端与基站之间的信道估计。在本公开中，通过用户终端向基站发送主参考信号，可以使得基站根据主参考信号对用户终端的信道进行估计。或者，在本公开中，结合下面将要描述的步骤S203，通过用户终端向基站发送主参考信号和辅助参考信号，可以使得基站根据主参考信号和辅助参考信号对用户终端的信道进行估计。
然后，当确定向基站发送辅助参考信号时，在步骤S203中，用户终端根据辅助参考信号的配置信息向基站发送辅助参考信号。辅助参考信号的配置信息例如可以包括发送辅助参考信号时使用的时频资源的信息、辅助参考信号的序列信息、辅助参考信号和主参考信号之间的映射信息中的至少一个。
根据本公开的一个示例，当步骤S203中的辅助参考信号的配置信息包括发送辅助参考信号时使用的时频资源的信息时，用户终端可以在辅助参考信号的配置信息中所指示的时频资源上发送辅助参考信号。
根据本公开的另一示例，当步骤S203中的辅助参考信号的配置信息包括辅助参考信号的序列信息时，用户终端可以对辅助参考信号的配置信息中所指示的序列信息进行调制以生成模拟的辅助参考信号。
根据本公开的另一示例，当步骤S203中的辅助参考信号的配置信息包括辅助参考信号和主参考信号之间的映射信息时，用户终端可以根据辅助参考信号的配置信息中所指示的映射信息生成辅助参考信号。本公开的“映射信息”可以是辅助参考信号和主参考信号的样式映射信息，其可以指示辅助参考信号的样式和主参考信号的样式是否一一对应。例如，该“映射信息”可以指示辅助参考信号的样式和主参考信号的样式是一对一，或者也可以指示辅助参考信号的样式和主参考信号的样式是多对一。
根据本公开的一个示例，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是一对一时，用户终端可以根据辅助参考信号和主参考信号之间的映射信息，基于主参考信号获得辅助参 考信号；以及向基站发送所生成的辅助参考信号。例如，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是一对一时，辅助参考信号可以与主参考信号相同。
在该示例中，用户终端的与其主参考信号和辅助参考信号相对应的正交覆盖码(Orthogonal Cover Code，OCC)与另一用户终端的正交覆盖码不同，以使得这两个用户终端的参考信号正交。例如，一个用户终端的OCC可以为[1,1]，另一用户终端的OCC可以为[1,-1]。又例如，一个用户终端的OCC可以为[1,1,1,1]，另一用户终端的OCC可以为[1,1,-1,-1]。又例如，一个用户终端的OCC可以为[1,-1,-1,1]，另一用户终端的OCC可以为[1,-1,1,-1]。
在此以一个用户终端的OCC为[1,1]，另一用户终端的OCC为[1,-1]为例描述OCC的使用过程。例如，当第一用户终端的OCC为[1,1]时，将第一用户终端的主参考信号的序列和辅助参考信号的序列均乘以加权值1；当第二用户终端的OCC为[1,-1]时，则将第二用户终端的主参考信号的序列乘以加权值1以及将第二用户终端的辅助参考信号的序列乘以加权值-1。
根据本公开的另一示例，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是多对一时，用户终端可以根据辅助参考信号和主参考信号之间的映射信息获得多个候选参考信号。例如，可以将多个准正交(quasi-orthogonal)的参考信号确定为多个候选参考信号。通过引入辅助参考信号和主参考信号之间的映射信息，辅助参考信号的样式或辅助参考信号池被扩大，从而降低了参考信号碰撞的概率。
在该示例中，用户终端还可以从上述多个候选参考信号中选择一个参考信号，将所选择的参考信号作为所述辅助参考信号发送给基站。例如，用户终端可以按照预定规则从多个候选参考信号中选择一个作为辅助参考信号，并将其发送给基站。又例如，用户终端可以从多个候选参考信号中随机地选择一个作为辅助参考信号，并将其发送给基站。
此外，根据本公开的另一示例，在步骤S203中，用户终端可以根据辅助参考信号的配置信息，使用不向基站发送辅助参考信号时用于发送数据的信道资源向基站发送辅助参考信号。例如，用户终端可以根据辅助参考信号的配置信息，使用物理上行共享信道向基站发送辅助参考信号。也就是说，用户终端可以使用用于发送业务数据的时间资源来发送辅助参考信号。
另外，该用户终端发送辅助参考信号所使用的时间资源与其他未发送辅助参考信号的用户终端发送业务数据所使用的时间资源可以是重叠的。例如，在边缘用户终端向基站发送辅助参考信号而中心用户终端不向基站发送辅助参考信号的情形下，边缘用户终端发送辅助参考信号所使用的时间资源与中心用户终端发送业务数据所使用的时间资源可以是重叠的。
此外，对于上述示例中描述的“辅助参考信号的配置信息”和“关于系统参数的预定阈值”，基站可以将这二者作为用户终端使用辅助参考信号的规则且以系统信令的方式将该规则广播给一个或多个用户终端。因此，根据本公开的一个示例，用户终端可以通过接收该系统信令而获得“辅助参考信号的配置信息”和“关于系统参数的预定阈值”，从而确定是否向基站发送辅助参考信号以及确定向基站发送辅助参考信号时如何将其发送给基站。
此外，需要认识到，上面所描述的步骤S202和步骤S203可以同时执行，也可以不同时执行，本公开对此不做限定。
通过本实施例的由通信系统中的用户终端执行的用于发送信号的方法，用户终端可以自适应地发送辅助参考信号，而不需要基站通过信令通知用户终端发送辅助参考信号，节省了信令开销，提高了资源的利用率。另外，由于用户终端向基站不仅发送主参考信号，而且还发送辅助参考信号，增加了参考信号的样式，减少了参考信号碰撞的概率，提高了信道估计的准确性。
下面，参照图3描述与方法200相对应的由通信系统中的基站执行的用于接收信号的方法。图3是根据本公开的一个实施例的由通信系统中的基站执行的用于接收信号的方法300的流程图。由于方法300与在上文中参照图2描述的方法200的部分细节相同，因此在这里为了简单起见，省略对相同内容的详细描述。如图3所示，在步骤S301中，基站从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号。
根据本公开的一个示例，基站所接收的信号可以包括用户终端的参考信号以及业务数据。当多个用户终端向基站发送信号时，基站可能在同一时刻接收到多个用户终端的信号。在该情形下，基站需要从接收到的信号中先检测各个用户终端的参考信号，以便后续根据各个用户终端的参考信号从接收到的信号中检测各个用户终端的业务数据。
根据本公开的另一示例，在步骤S301中，基站可以先检测各个用户终端的主参考信号，然后再检测各个用户终端的辅助参考信号。在该示例中，当基站检测各个用户终端的辅助参考信号时，基站可以分别检测每个辅助参考信号的各个部分。例如，对于每个辅助参考信号，基站检测到该辅助参考信号的第一部分后，可以判断是否还存在第二部分，若是，则继续检测该辅助参考信号的第二部分。基站重复判断与检测的操作，直到检测到该辅助参考信号的各个部分。
根据本公开的另一示例，在步骤S301之前，方法300还可以包括：基站从来自一个或多个用户终端的信号中检测一个或多个用户终端的用户信息。例如，用户终端可以在向基站发送参考信号和业务数据的同时，向基站发送接入信息。接入信息例如前导(preamble)码(也可以称为前导序列或随机接入前导码)。相应地，基站可以根据接收到的前导码检测用户终端的用户信息。通过检测用户终端的用户信息，基站可以在步骤S301中检测出与每个用户终端相对应的参考信号。
根据本公开的另一示例，在步骤S301之后，方法300还可以包括：基站根据所检测的参考信号确定来自多个用户终端的信号是否发生了碰撞。例如，基站可以分别判断每个用户终端的辅助参考信号的功率和主参考信号的功率是否相同，并且当存在用户终端的辅助参考信号的功率和主参考信号的功率不相同时，基站可以确定来自多个用户终端的信号发生了碰撞。
在该示例中，当多个用户终端向基站发送相同的主参考信号时，会发生主参考信号之间的碰撞，从而导致了基站区分不了各个用户终端的主参考信号。因此，基站所检测到的主参考信号是多个用户终端的主参考信号的叠加。而多个用户终端发送的辅助参考信号是与各个用户终端的用户信息相对应的，因此，基站可以区分各个用户终端的辅助参考信号，即基站可以检测到各个用户终端的辅助参考信号。由此可见，通过该示例，基站所检测到的主参考信号的功率是多个用户终端的主参考信号的功率之和，而基站可以检测到各个用户终端的辅助参考信号，因此，当基站判断每个用户终端的辅助参考信号的功率和主参考信号的功率相同时，可以确定多个用户终端的信号没有发生碰撞；而当基站判断存在用户终端的辅助参考信号的功率和主参考信号的功率不相同时，可以确定多个用户终端的信号发生了碰撞。
下面结合表1给出基站根据所检测的参考信号确定来自多个用户终端的信号是否发生了碰撞的示例。如表1所示，在第一种情形下，当基站检测到第一用户终端(UE1)的主参考信号而未检测到第一用户终端的辅助参考信号时，第一用户终端的主参考信号的功率为P A1且第一用户终端的辅助参考信号的功率P B为0。由于基站只检测到第一用户终端的参考信号而未检测到其他用户终端的参考信号，因此，基站可以确定用户终端的信号没有发生碰撞。
如表1所示，在第二种情形下，当基站检测到第一用户终端(UE1)的主参考信号以及辅助参考信号时，第一用户终端的主参考信号的功率为P A1且第一用户终端的辅助参考信号的功率为P B1。由于基站只检测到第一用户终端的参考信号而未检测到其他用户终端的参考信号，因此P A1＝P B1，则基站可以确定用户终端的信号没有发生碰撞。
如表1所示，在第三种情形下，当基站检测到第一用户终端(UE1)的主参考信号以及辅助参考信号、以及第二用户终端(UE2)的主参考信号以及辅助参考信号时，基站不能区分第一用户终端和第二用户终端的主参考信号，因此，第一用户终端的主参考信号的功率为(P A1+P A2)且第一用户终端的辅助参考信号的功率为P B1，第二用户终端的主参考信号的功率为(P A1+P A2)且第二用户终端的辅助参考信号的功率为P B2，。由于(P A1+P A2)≠P B1且(P A1+P A2)≠P B2，则基站可以确定第一用户终端和第二用户终端的信号发生了碰撞。
如表1所示，在第四种情形下，当基站检测到第一用户终端(UE1)的主参考信号而未检测到第一用户终端的辅助参考信号、以及检测到第二用户终端(UE2)的主参考信号以及辅助参考信号时，基站不能区分第一用户终端和第二用户终端的主参考信号，因此，第一用户终端的主参考信号的功率为(P A1+P A2)且第一用户终端的辅助参考信号的功率为0，第二用户终端的主参考信号的功率为(P A1+P A2)且第二用户终端的辅助参考信号的功率为P B2，。由于(P A1+P A2)≠0且(P A1+P A2)≠P B2，则基站可以确定第一用户终端和第二用户终端的信号发生了碰撞。
Figure PCTCN2018086470-appb-000001
Figure PCTCN2018086470-appb-000002
表1 判断是否发生信号碰撞的示例
然后，在步骤S302中，基站根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。例如，当来自多个用户终端的信号没有发生碰撞时，基站可以从所接收的信号中检测各个用户终端的业务数据。
以下结合图4描述基站从所接收的信号中检测各个用户终端的业务数据的方法。图4是根据本公开的一个实施例的基站从所接收的信号中检测各个用户终端的业务数据的方法400的流程图。如图4所示，在步骤S401中，基站可以使用所检测的主参考信号进行信道估计，从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据。在本公开中，基站可以使用所检测的主参考信号进行信道估计以获得信道估计信息，然后根据所获得的信道估计信息从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据。此外，基站可以通过串行干扰删除的方式从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据，并对所检测的数据进行重构和删除。
例如，图5示出了基站根据方法400从所接收的信号中检测各个用户终端的业务数据的过程示意图。如图5所示，基站接收到(N+M)个用户终端的信号，其中N、M均为正整数。该(N+M)个用户终端可以包括N个不使用辅助参考信号的用户终端(UE 1-1、……UE 1-N)和M个使用辅助参考信号的用户终端(UE 2-1、……UE 2-M)。
如图5所示，基站可以使用N个不使用辅助参考信号的用户终端的N个主参考信号和M个使用辅助参考信号的用户终端的M个主参考信号进行初次信道估计，以获得N个信道初次估计值和M个信道初次估计值。然后，基站根据该N个信道初次估计值(CE 1_1、……CE 1_N)和M个信道初次估计值(CE 2_1、……CE 2_M)对接收到的信号进行最小均方误差-串行干扰消除 (Minimum Mean Square Error-Successive Interference Cancellation，MMSE-SIC)处理，以检测N个不使用辅助参考信号的用户终端的业务数据。
然后，在步骤S402中，基站可以使用所检测的、发送辅助参考信号和主参考信号二者的用户终端的辅助参考信号和主参考信号进行信道估计，从所接收的信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据。在本公开中，基站可以使用所检测的、发送辅助参考信号和主参考信号二者的用户终端的辅助参考信号和主参考信号进行信道估计以获得信道估计信息，然后根据所获得的信道估计信息从所接收的信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据。此外，基站可以通过串行干扰删除的方式从所接收的信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据，并对所检测的数据进行重构和删除。
例如，继续参照图5，如图5所示，基站可以使用M个使用辅助参考信号的用户终端的M个主参考信号和M个辅助参考信号进行再次信道估计，以获得M个信道再次估计值。然后，基站根据该M个信道再次估计值(CE’ 2_1、……CE’ 2_M)对接收到的信号进行最小均方误差-串行干扰消除(Minimum Mean Square Error-Successive Interference Cancellation，MMSE-SIC)处理，以检测M个使用辅助参考信号的用户终端的业务数据。
通过上述步骤S401～S402，基站从所接收的信号中检测出了各个用户终端的业务数据。下面结合图6以基站接收到两个用户终端的信号为例再次描述方法400。图6是基站根据方法400从所接收的信号中检测两个用户终端的业务数据的过程示意图。
如图6所示，第一用户终端(UE_1)为不使用辅助参考信号的用户终端，该第一用户终端向基站发送第一主参考信号(DMRS 1)以及相应的业务数据；而第二用户终端(UE_2)为使用辅助参考信号的用户终端，该第二用户终端向基站发送第二主参考信号(DMRS 2)和辅助参考信号(A-DMRS)以及相应的业务数据。相应地，基站接收到第一用户终端和第二用户终端发送的信号。需要注意的是，在图6中所示的DMRS和A-DMRS在时频资源上的位置仅仅是示例性的。在本公开的其他示例中，可以任意地定义DMRS和A-DMRS在时频资源上的位置。
基站在接收到第一用户终端和第二用户终端发送的信号之后，首先根据第一主参考信号(DMRS 1)和第二主参考信号(DMRS 2)进行初次信道估计，以获得两个信道初次估计值(CE 1、CE 2)。然后，基站根据该两个信道初次估计值(CE 1、CE 2)从接收到的信号中检测出第一用户终端的业务数据，并且对第一用户终端的业务数据进行解调以获得解调后的数据。
在检测出第一用户终端的业务数据之后，基站可以根据第二主参考信号(DMRS 2)和辅助参考信号(A-DMRS)进行再次信道估计，以获得信道再次估计值(CE’ 2)。然后，基站根据该信道再次估计值(CE’ 2)从接收到的信号中检测出第二用户终端的业务数据。类似的，基站也可以对第二用户终端的业务数据进行解调以获得解调后的数据(图中未示出)。
通过本实施例的由通信系统中的基站执行的用于接收信号的方法，基站不需要通过信令通知用户终端发送辅助参考信号，节省了信令开销，提高了资源的利用率。另外，基站不仅从用户终端接收主参考信号，而且还接收辅助参考信号，增加了参考信号的样式，减少了参考信号碰撞的概率，提高了信道估计的准确性。
下面，参照图7来描述根据本公开一个实施例的执行方法200的用户终端。图7是根据本公开的一个实施例的用户终端700的结构示意图。由于用户终端700的功能与在上文中参照图2描述的方法的细节相同，因此在这里为了简单起见，省略对相同内容的详细描述。如图7所示，用户终端700包括：确定单元710，被配置为根据关于所述用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；发送单元720，其被配置为向基站发送主参考信号，其中所述主参考信号用于所述用户终端与所述基站之间的信道估计；以及当所述确定单元710确定向所述基站发送辅助参考信号时，所述发送单元720被配置为根据辅助参考信号的配置信息向基站发送所述辅助参考信号。除了这两个单元以外，用户终端700还可以包括其他部件，然而，由于这些部件与本公开实施例的内容无关，因此在这里省略其图示和描述。
确定单元710根据关于用户终端的信道条件的信息确定是否向基站发送辅助参考信号。例如，当关于用户终端的信道条件的信息指示用户终端的信道较差时，确定单元710可以确定向基站发送辅助参考信号。相反地，当 关于用户终端的信道条件的信息指示用户终端的信道较好时，确定单元710可以确定不向基站发送辅助参考信号。
关于用户终端的信道条件的信息例如可以包括动态信息，该动态信息可以是通过对用户终端的信道进行测量而获得的。根据本公开的一个示例，动态信息可以包括信号接收功率信息。信号接收功率信息例如可以是关于参考信号接收功率(Reference Signal Receiving Power，RSRP)的信息。例如，用户终端可以对在信道上传输的下行参考信号进行实时测量而获得RSRP。然后，确定单元710可以根据RSRP确定是否向基站发送辅助参考信号。
此外，根据本公开的另一示例，动态信息还可以包括传输时间提前信息。传输时间提前信息例如可以是关于定时提前(Timing Advance，TA)的信息。例如，基站可以对用户终端经由信道向基站发送的信号进行实时测量而获得TA。然后，基站可以将所测量的TA通知给用户终端，以便确定单元710根据TA确定是否向基站发送辅助参考信号。
根据本公开的另一示例，关于用户终端的信道条件的信息还可以包括用户终端的传输设置信息。用户终端的传输设置信息例如可以是基站为用户终端进行信号传输而确定的初始设置信息，比如数据重传次数或数据重传次数与辅助参考信号的对应关系。然后，确定单元710可以根据数据重传次数或数据重传次数与辅助参考信号的对应关系确定是否向基站发送辅助参考信号。
另外，根据本公开的另一示例，关于用户终端的信道条件的信息还可以包括用户终端的类型。当用户终端为中心用户终端时，表明用户终端的信道条件较好，因此，确定单元710可以确定不向基站发送辅助参考信号。相反地，当用户终端为边缘用户终端时，表明用户终端的信道条件较差，因此，确定单元710可以确定向基站发送辅助参考信号。
至此，已经描述了确定单元710根据关于用户终端的信道条件的信息确定是否向基站发送辅助参考信号。应该理解，上面描述了确定单元710根据自身的信道条件来确定是否向基站发送辅助参考信号。然而本公开不限于此。根据本公开的另一示例，确定单元710还可以根据通信系统的系统性能来确定是否向基站发送辅助参考信号。例如，确定单元710根据通信系统的关于系统参数的预定阈值确定是否向基站发送辅助参考信号。比如，当通信系统 的系统参数满足关于系统参数的预定阈值时，表明通信系统的系统性能较差，因此，确定单元710可以确定向基站发送辅助参考信号。相反地，当通信系统的系统参数不满足关于系统参数的预定阈值时，表明通信系统的系统性能较好，因此，确定单元710可以确定不向基站发送辅助参考信号。
在该示例中，关于系统参数的预定阈值可以包括关于系统吞吐量的阈值、关于信道估计的准确性的阈值、关于根据用户终端的数量分配资源的均匀性的阈值、关于参考信号碰撞概率的阈值等中的一个或多个。基站可以收集一个或多个用户终端上报的信息来确定关于系统参数的预定阈值，并将关于系统参数的预定阈值作为系统信令广播给一个或多个用户终端。相应地，用户终端可以通过接收该广播的系统信令获得关于系统参数的预定阈值，以便用户终端根据关于系统参数的预定阈值确定是否向基站发送辅助参考信号。
此外，用户终端还可以从来自基站的系统信令获得通信系统的系统参数，或者可以根据关于用户终端的信道条件的信息来估测通信系统的系统参数，以便确定单元710根据通信系统的系统参数与关于系统参数的预定阈值确定是否向基站发送辅助参考信号。
另外，根据本公开的另一示例，确定单元710也可以根据自身的信道条件以及通信系统的系统性能二者来确定是否向基站发送辅助参考信号。例如，确定单元710根据关于用户终端的信道条件的信息以及通信系统的关于系统参数的预定阈值确定是否向基站发送辅助参考信号。比如，当关于用户终端的信道条件的信息指示用户终端的信道较差且通信系统的系统参数满足关于系统参数的预定阈值时，确定单元710可以确定向基站发送辅助参考信号。相反地，当关于用户终端的信道条件的信息指示用户终端的信道较好且通信系统的系统参数不满足关于系统参数的预定阈值时，确定单元710可以确定不向基站发送辅助参考信号。
辅助参考信号的配置信息例如可以包括发送辅助参考信号时使用的时频资源的信息、辅助参考信号的序列信息、辅助参考信号和主参考信号之间的映射信息中的至少一个。
根据本公开的一个示例，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是一对一时，发送单元720可以根据辅助参考信号和主参考信号之间的映射信息，基于主参考信号获得辅 助参考信号；以及向基站发送所生成的辅助参考信号。例如，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是一对一时，辅助参考信号可以与主参考信号相同。
根据本公开的另一示例，当辅助参考信号和主参考信号之间的映射信息指示辅助参考信号的样式和主参考信号的样式是多对一时，发送单元720可以根据辅助参考信号和主参考信号之间的映射信息获得多个候选参考信号。例如，可以将多个准正交(quasi-orthogonal)的参考信号确定为多个候选参考信号。通过引入辅助参考信号和主参考信号之间的映射信息，辅助参考信号的样式或辅助参考信号池被扩大，从而降低了参考信号碰撞的概率。
在该示例中，发送单元720还可以从上述多个候选参考信号中选择一个参考信号，将所选择的参考信号作为所述辅助参考信号发送给基站。例如，发送单元720可以按照预定规则从多个候选参考信号中选择一个作为辅助参考信号，并将其发送给基站。又例如，发送单元720可以从多个候选参考信号中随机地选择一个作为辅助参考信号，并将其发送给基站。
此外，根据本公开的另一示例，发送单元720可以根据辅助参考信号的配置信息，使用不向基站发送辅助参考信号时用于发送数据的信道资源向基站发送辅助参考信号。例如，发送单元720可以根据辅助参考信号的配置信息，使用物理上行共享信道向基站发送辅助参考信号。也就是说，发送单元720可以使用用于发送业务数据的时间资源来发送辅助参考信号。
另外，发送单元720发送辅助参考信号所使用的时间资源与其他未发送辅助参考信号的用户终端发送业务数据所使用的时间资源可以是重叠的。例如，在边缘用户终端向基站发送辅助参考信号而中心用户终端不向基站发送辅助参考信号的情形下，边缘用户终端发送辅助参考信号所使用的时间资源与中心用户终端发送业务数据所使用的时间资源可以是重叠的。
通过本实施例的用户终端可以自适应地发送辅助参考信号，而不需要基站通过信令通知用户终端发送辅助参考信号，节省了信令开销，提高了资源的利用率。另外，由于用户终端向基站不仅发送主参考信号，而且还发送辅助参考信号，增加了参考信号的样式，减少了参考信号碰撞的概率，提高了信道估计的准确性。
下面，参照图8来描述根据本公开一个实施例的执行方法300的基站。 图8是示出了根据本公开的一个实施例的基站800的结构示意图。由于基站800的功能与在上文中参照图3-5描述的方法的细节相同，因此在这里为了简单起见，省略对相同内容的详细描述。如图8所示，基站800包括：检测单元810，被配置为从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号；以及所述检测单元810还被配置为根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。除了这个单元以外，基站800还可以包括其他部件，然而，由于这些部件与本公开实施例的内容无关，因此在这里省略其图示和描述。
根据本公开的一个示例，基站800还可以包括接收单元820，其被配置为接收来自用户终端的信号，比如用户终端的参考信号以及业务数据。当多个用户终端向基站发送信号时，接收单元820可能在同一时刻接收到多个用户终端的信号。在该情形下，检测单元810需要从接收到的信号中先检测各个用户终端的参考信号，以便后续根据各个用户终端的参考信号从接收到的信号中检测各个用户终端的业务数据。
根据本公开的另一示例，检测单元810可以先检测各个用户终端的主参考信号，然后再检测各个用户终端的辅助参考信号。在该示例中，当检测单元810检测各个用户终端的辅助参考信号时，检测单元810可以分别检测每个辅助参考信号的各个部分。例如，对于每个辅助参考信号，检测单元810检测到该辅助参考信号的第一部分后，可以判断是否还存在第二部分，若是，则继续检测该辅助参考信号的第二部分。检测单元810重复判断与检测的操作，直到检测到该辅助参考信号的各个部分。
根据本公开的另一示例，检测单元810可以从来自一个或多个用户终端的信号中检测一个或多个用户终端的用户信息。例如，用户终端可以在向基站发送参考信号和业务数据的同时，向基站发送接入信息。接入信息例如前导(preamble)码(也可以称为前导序列或随机接入前导码)。相应地，基站可以根据接收到的前导码检测用户终端的用户信息。通过检测用户终端的用户信息，检测单元810可以检测出与每个用户终端相对应的参考信号。
根据本公开的另一示例，检测单元810可以根据所检测的参考信号确定来自多个用户终端的信号是否发生了碰撞。例如，检测单元810可以分别判 断每个用户终端的辅助参考信号的功率和主参考信号的功率是否相同，并且当存在用户终端的辅助参考信号的功率和主参考信号的功率不相同时，检测单元810可以确定来自多个用户终端的信号发生了碰撞。
在该示例中，当多个用户终端向基站发送相同的主参考信号时，会发生主参考信号之间的碰撞，从而导致了基站区分不了各个用户终端的主参考信号。因此，基站所检测到的主参考信号是多个用户终端的主参考信号的叠加。而多个用户终端发送的辅助参考信号是与各个用户终端的用户信息相对应的，因此，基站可以区分各个用户终端的辅助参考信号，即基站可以检测到各个用户终端的辅助参考信号。由此可见，通过该示例，基站所检测到的主参考信号的功率是多个用户终端的主参考信号的功率之和，而基站可以检测到各个用户终端的辅助参考信号，因此，当基站判断每个用户终端的辅助参考信号的功率和主参考信号的功率相同时，可以确定多个用户终端的信号没有发生碰撞；而当基站判断存在用户终端的辅助参考信号的功率和主参考信号的功率不相同时，可以确定多个用户终端的信号发生了碰撞。
然后，检测单元810根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。例如，当来自多个用户终端的信号没有发生碰撞时，检测单元810可以从所接收的信号中检测各个用户终端的业务数据。
检测单元810可以使用所检测的主参考信号进行信道估计，从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据。在本公开中，检测单元810可以使用所检测的主参考信号进行信道估计以获得信道估计信息，然后根据所获得的信道估计信息从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据。此外，检测单元810可以通过串行干扰删除的方式从所接收的信号中检测未发送辅助参考信号的用户终端的业务数据，并对所检测的数据进行重构和删除。
然后，检测单元810可以使用所检测的、发送辅助参考信号和主参考信号二者的用户终端的辅助参考信号和主参考信号进行信道估计，从所接收的信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据。在本公开中，检测单元810可以使用所检测的、发送辅助参考信号和主参考信号二者的用户终端的辅助参考信号和主参考信号进行信道估计以获得信道估计信息，然后根据所获得的信道估计信息从所接收的信号中检测所 述发送辅助参考信号和主参考信号二者的用户终端的业务数据。此外，检测单元810可以通过串行干扰删除的方式从所接收的信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据，并对所检测的数据进行重构和删除。
通过本实施例的基站，不需要通过信令通知用户终端发送辅助参考信号，节省了信令开销，提高了资源的利用率。另外，基站不仅从用户终端接收主参考信号，而且还接收辅助参考信号，增加了参考信号的样式，减少了参考信号碰撞的概率，提高了信道估计的准确性。
<硬件结构>
另外，上述实施方式的说明中使用的框图示出了以功能为单位的块。这些功能块(结构单元)通过硬件和/或软件的任意组合来实现。此外，各功能块的实现手段并不特别限定。即，各功能块可以通过在物理上和/或逻辑上相结合的一个装置来实现，也可以将在物理上和/或逻辑上相分离的两个以上装置直接地和/或间接地(例如通过有线和/或无线)连接从而通过上述多个装置来实现。
例如，本公开的一个实施例的设备(比如第一通信设备、第二通信设备或飞行用户终端等)可以作为执行本公开的无线通信方法的处理的计算机来发挥功能。图9是根据本公开的实施例的所涉及的设备900(基站或用户终端)的硬件结构的示意图。上述的设备900(基站或用户终端)可以作为在物理上包括处理器910、内存920、存储器930、通信装置940、输入装置950、输出装置960、总线970等的计算机装置来构成。
另外，在以下的说明中，“装置”这样的文字也可替换为电路、设备、单元等。用户终端700和基站800的硬件结构可以包括一个或多个图中所示的各装置，也可以不包括部分装置。
例如，处理器910仅图示出一个，但也可以为多个处理器。此外，可以通过一个处理器来执行处理，也可以通过一个以上的处理器同时、依次、或采用其它方法来执行处理。另外，处理器910可以通过一个以上的芯片来安装。
设备900的各功能例如通过如下方式实现：通过将规定的软件(程序)读入到处理器910、内存920等硬件上，从而使处理器910进行运算，对由 通信装置940进行的通信进行控制，并对内存920和存储器930中的数据的读出和/或写入进行控制。
处理器910例如使操作系统进行工作从而对计算机整体进行控制。处理器910可以由包括与周边装置的接口、控制装置、运算装置、寄存器等的中央处理器(CPU，Central Processing Unit)构成。例如，上述的确定单元、调整单元等可以通过处理器910实现。
此外，处理器910将程序(程序代码)、软件模块、数据等从存储器930和/或通信装置940读出到内存920，并根据它们执行各种处理。作为程序，可以采用使计算机执行在上述实施方式中说明的动作中的至少一部分的程序。例如，用户终端500的确定单元可以通过保存在内存920中并通过处理器910来工作的控制程序来实现，对于其它功能块，也可以同样地来实现。
内存920是计算机可读取记录介质，例如可以由只读存储器(ROM，Read Only Memory)、可编程只读存储器(EPROM，Erasable Programmable ROM)、电可编程只读存储器(EEPROM，Electrically EPROM)、随机存取存储器(RAM，Random Access Memory)、其它适当的存储介质中的至少一个来构成。内存920也可以称为寄存器、高速缓存、主存储器(主存储装置)等。内存920可以保存用于实施本公开的一实施方式所涉及的方法的可执行程序(程序代码)、软件模块等。
存储器930是计算机可读取记录介质，例如可以由软磁盘(flexible disk)、软(注册商标)盘(floppy disk)、磁光盘(例如，只读光盘(CD-ROM(Compact Disc ROM)等)、数字通用光盘、蓝光(Blu-ray，注册商标)光盘)、可移动磁盘、硬盘驱动器、智能卡、闪存设备(例如，卡、棒(stick)、密钥驱动器(key driver))、磁条、数据库、服务器、其它适当的存储介质中的至少一个来构成。存储器930也可以称为辅助存储装置。
通信装置940是用于通过有线和/或无线网络进行计算机间的通信的硬件(发送接收设备)，例如也称为网络设备、网络控制器、网卡、通信模块等。通信装置940为了实现例如频分双工(FDD，Frequency Division Duplex)和/或时分双工(TDD，Time Division Duplex)，可以包括高频开关、双工器、滤波器、频率合成器等。例如，上述的发送单元、接收单元等可以通过通信装置940来实现。
输入装置950是接受来自外部的输入的输入设备(例如，键盘、鼠标、麦克风、开关、按钮、传感器等)。输出装置960是实施向外部的输出的输出设备(例如，显示器、扬声器、发光二极管(LED，Light Emitting Diode)灯等)。另外，输入装置950和输出装置960也可以为一体的结构(例如触控面板)。
此外，处理器910、内存920等各装置通过用于对信息进行通信的总线970连接。总线970可以由单一的总线构成，也可以由装置间不同的总线构成。
此外，基站800和用户终端700可以包括微处理器、数字信号处理器(DSP，Digital Signal Processor)、专用集成电路(ASIC，Application Specific Integrated Circuit)、可编程逻辑器件(PLD，Programmable Logic Device)、现场可编程门阵列(FPGA，Field Programmable Gate Array)等硬件，可以通过该硬件来实现各功能块的部分或全部。例如，处理器910可以通过这些硬件中的至少一个来安装。
(变形例)
另外，关于本说明书中说明的用语和/或对本说明书进行理解所需的用语，可以与具有相同或类似含义的用语进行互换。例如，信道和/或符号也可以为信号(信令)。此外，信号也可以为消息。参考信号也可以简称为RS(Reference Signal)，根据所适用的标准，也可以称为导频(Pilot)、导频信号等。此外，分量载波(CC，Component Carrier)也可以称为小区、频率载波、载波频率等。
此外，本说明书中说明的信息、参数等可以用绝对值来表示，也可以用与规定值的相对值来表示，还可以用对应的其它信息来表示。例如，无线资源可以通过规定的索引来指示。进一步地，使用这些参数的公式等也可以与本说明书中明确公开的不同。
在本说明书中用于参数等的名称在任何方面都并非限定性的。例如，各种各样的信道(物理上行链路控制信道(PUCCH，Physical Uplink Control Channel)、物理下行链路控制信道(PDCCH，Physical Downlink Control Channel)等)和信息单元可以通过任何适当的名称来识别，因此为这些各 种各样的信道和信息单元所分配的各种各样的名称在任何方面都并非限定性的。
本说明书中说明的信息、信号等可以使用各种各样不同技术中的任意一种来表示。例如，在上述的全部说明中可能提及的数据、命令、指令、信息、信号、比特、符号、芯片等可以通过电压、电流、电磁波、磁场或磁性粒子、光场或光子、或者它们的任意组合来表示。
此外，信息、信号等可以从上层向下层、和/或从下层向上层输出。信息、信号等可以经由多个网络节点进行输入或输出。
输入或输出的信息、信号等可以保存在特定的场所(例如内存)，也可以通过管理表进行管理。输入或输出的信息、信号等可以被覆盖、更新或补充。输出的信息、信号等可以被删除。输入的信息、信号等可以被发往其它装置。
信息的通知并不限于本说明书中说明的方式/实施方式，也可以通过其它方法进行。例如，信息的通知可以通过物理层信令(例如，下行链路控制信息(DCI，Downlink Control Information)、上行链路控制信息(UCI，Uplink Control Information))、上层信令(例如，无线资源控制(RRC，Radio Resource Control)信令、广播信息(主信息块(MIB，Master Information Block)、系统信息块(SIB，System Information Block)等)、媒体存取控制(MAC，Medium Access Control)信令)、其它信号或者它们的组合来实施。
另外，物理层信令也可以称为L1/L2(第1层/第2层)控制信息(L1/L2控制信号)、L1控制信息(L1控制信号)等。此外，RRC信令也可以称为RRC消息，例如可以为RRC连接建立(RRC Connection Setup)消息、RRC连接重配置(RRC Connection Reconfiguration)消息等。此外，MAC信令例如可以通过MAC控制单元(MAC CE(Control Element))来通知。
此外，规定信息的通知(例如，“为X”的通知)并不限于显式地进行，也可以隐式地(例如，通过不进行该规定信息的通知，或者通过其它信息的通知)进行。
关于判定，可以通过由1比特表示的值(0或1)来进行，也可以通过由真(true)或假(false)表示的真假值(布尔值)来进行，还可以通过数值的比较(例如与规定值的比较)来进行。
软件无论被称为软件、固件、中间件、微代码、硬件描述语言，还是以其它名称来称呼，都应宽泛地解释为是指命令、命令集、代码、代码段、程序代码、程序、子程序、软件模块、应用程序、软件应用程序、软件包、例程、子例程、对象、可执行文件、执行线程、步骤、功能等。
此外，软件、命令、信息等可以经由传输介质被发送或接收。例如，当使用有线技术(同轴电缆、光缆、双绞线、数字用户线路(DSL，Digital Subscriber Line)等)和/或无线技术(红外线、微波等)从网站、服务器、或其它远程资源发送软件时，这些有线技术和/或无线技术包括在传输介质的定义内。
本说明书中使用的“系统”和“网络”这样的用语可以互换使用。
在本说明书中，“基站(BS，Base Station)”、“无线基站”、“eNB”、“gNB”、“小区”、“扇区”、“小区组”、“载波”以及“分量载波”这样的用语可以互换使用。基站有时也以固定台(fixed station)、NodeB、eNodeB(eNB)、接入点(access point)、发送点、接收点、毫微微小区、小小区等用语来称呼。
基站可以容纳一个或多个(例如三个)小区(也称为扇区)。当基站容纳多个小区时，基站的整个覆盖区域可以划分为多个更小的区域，每个更小的区域也可以通过基站子系统(例如，室内用小型基站(射频拉远头(RRH，Remote Radio Head)))来提供通信服务。“小区”或“扇区”这样的用语是指在该覆盖中进行通信服务的基站和/或基站子系统的覆盖区域的一部分或整体。
在本说明书中，“移动台(MS，Mobile Station)”、“用户终端(user terminal)”、“用户装置(UE，User Equipment)”以及“终端”这样的用语可以互换使用。移动台有时也被本领域技术人员以用户台、移动单元、用户单元、无线单元、远程单元、移动设备、无线设备、无线通信设备、远程设备、移动用户台、接入终端、移动终端、无线终端、远程终端、手持机、用户代理、移动客户端、客户端或者若干其它适当的用语来称呼。
此外，本说明书中的无线基站也可以用用户终端来替换。例如，对于将无线基站和用户终端间的通信替换为多个用户终端间(D2D，Device-to-Device)的通信的结构，也可以应用本公开的各方式/实施方式。此时，可以将上述的设备900中的第一通信设备或第二通信设备所具有的功 能当作用户终端所具有的功能。此外，“上行”和“下行”等文字也可以替换为“侧”。例如，上行信道也可以替换为侧信道。
同样，本说明书中的用户终端也可以用无线基站来替换。此时，可以将上述的用户终端所具有的功能当作第一通信设备或第二通信设备所具有的功能。
在本说明书中，设为通过基站进行的特定动作根据情况有时也通过其上级节点(upper node)来进行。显然，在具有基站的由一个或多个网络节点(network nodes)构成的网络中，为了与终端间的通信而进行的各种各样的动作可以通过基站、除基站之外的一个以上的网络节点(可以考虑例如移动管理实体(MME，Mobility Management Entity)、服务网关(S-GW，Serving-Gateway)等，但不限于此)、或者它们的组合来进行。
本说明书中说明的各方式/实施方式可以单独使用，也可以组合使用，还可以在执行过程中进行切换来使用。此外，本说明书中说明的各方式/实施方式的处理步骤、序列、流程图等只要没有矛盾，就可以更换顺序。例如，关于本说明书中说明的方法，以示例性的顺序给出了各种各样的步骤单元，而并不限定于给出的特定顺序。
本说明书中说明的各方式/实施方式可以应用于利用长期演进(LTE，Long Term Evolution)、高级长期演进(LTE-A，LTE-Advanced)、超越长期演进(LTE-B，LTE-Beyond)、超级第3代移动通信系统(SUPER 3G)、高级国际移动通信(IMT-Advanced)、第4代移动通信系统(4G，4th generation mobile communication system)、第5代移动通信系统(5G，5th generation mobile communication system)、未来无线接入(FRA，Future Radio Access)、新无线接入技术(New-RAT，Radio Access Technology)、新无线(NR，New Radio)、新无线接入(NX，New radio access)、新一代无线接入(FX，Future generation radio access)、全球移动通信系统(GSM(注册商标)，Global System for Mobile communications)、码分多址接入3000(CDMA3000)、超级移动宽带(UMB，Ultra Mobile Broadband)、IEEE 920.11(Wi-Fi(注册商标))、IEEE 920.16(WiMAX(注册商标))、IEEE 920.20、超宽带(UWB，Ultra-WideBand)、蓝牙(Bluetooth(注册商标))、其它适当的无线通信方法的系统和/或基于它们而扩展的下一代系统。
本说明书中使用的“根据”这样的记载，只要未在其它段落中明确记载，则并不意味着“仅根据”。换言之，“根据”这样的记载是指“仅根据”和“至少根据”这两者。
本说明书中使用的对使用“第一”、“第二”等名称的单元的任何参照，均非全面限定这些单元的数量或顺序。这些名称可以作为区别两个以上单元的便利方法而在本说明书中使用。因此，第一单元和第二单元的参照并不意味着仅可采用两个单元或者第一单元必须以若干形式占先于第二单元。
本说明书中使用的“判断(确定)(determining)”这样的用语有时包含多种多样的动作。例如，关于“判断(确定)”，可以将计算(calculating)、推算(computing)、处理(processing)、推导(deriving)、调查(investigating)、搜索(looking up)(例如表、数据库、或其它数据结构中的搜索)、确认(ascertaining)等视为是进行“判断(确定)”。此外，关于“判断(确定)”，也可以将接收(receiving)(例如接收信息)、发送(transmitting)(例如发送信息)、输入(input)、输出(output)、存取(accessing)(例如存取内存中的数据)等视为是进行“判断(确定)”。此外，关于“判断(确定)”，还可以将解决(resolving)、选择(selecting)、选定(choosing)、建立(establishing)、比较(comparing)等视为是进行“判断(确定)”。也就是说，关于“判断(确定)”，可以将若干动作视为是进行“判断(确定)”。
本说明书中使用的“连接的(connected)”、“结合的(coupled)”这样的用语或者它们的任何变形是指两个或两个以上单元间的直接的或间接的任何连接或结合，可以包括以下情况：在相互“连接”或“结合”的两个单元间，存在一个或一个以上的中间单元。单元间的结合或连接可以是物理上的，也可以是逻辑上的，或者还可以是两者的组合。例如，“连接”也可以替换为“接入”。在本说明书中使用时，可以认为两个单元是通过使用一个或一个以上的电线、线缆、和/或印刷电气连接，以及作为若干非限定性且非穷尽性的示例，通过使用具有射频区域、微波区域、和/或光(可见光及不可见光这两者)区域的波长的电磁能等，被相互“连接”或“结合”。
在本说明书或权利要求书中使用“包括(including)”、“包含(comprising)”、以及它们的变形时，这些用语与用语“具备”同样是开放式的。进一步地，在本说明书或权利要求书中使用的用语“或(or)”并非是异或。
以上对本公开进行了详细说明，但对于本领域技术人员而言，显然，本公开并非限定于本说明书中说明的实施方式。本公开在不脱离由权利要求书的记载所确定的本公开的宗旨和范围的前提下，可以作为修改和变更方式来实施。因此，本说明书的记载是以示例说明为目的，对本公开而言并非具有任何限制性的意义。

Claims (18)

  1. 一种用于发送信号的方法，由通信系统中的用户终端执行，所述方法包括：
    根据关于所述用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；
    向所述基站发送主参考信号，其中所述主参考信号用于所述用户终端与所述基站之间的信道估计；以及
    当确定向所述基站发送辅助参考信号时，根据辅助参考信号的配置信息向基站发送所述辅助参考信号。
  2. 如权利要求1所述的方法，其中所述关于所述用户终端的信道条件的信息包括动态信息，所述动态信息是通过对信道进行测量而获得的。
  3. 如权利要求2所述的方法，其中所述动态信息包括用户终端的信号接收功率信息和/或传输时间提前信息。
  4. 如权利要求1所述的方法，其中所述关于所述用户终端的信道条件的信息包括所述用户终端的传输设置信息。
  5. 如权利要求4所述的方法，其中所述传输设置信息包括数据重传次数或数据重传次数与辅助参考信号的对应关系。
  6. 如权利要求1所述的方法，其中所述关于所述用户终端的信道条件的信息包括指示所述用户终端的类型的信息。
  7. 如权利要求1至6任一项所述的方法，其中所述辅助参考信号的配置信息包括发送辅助参考信号时使用的时频资源的信息、辅助参考信号的序列信息、辅助参考信号和主参考信号之间的映射信息中的至少一个。
  8. 如权利要求7所述的方法，其中
    所述配置信息包括辅助参考信号和主参考信号之间的映射信息，
    所述根据辅助参考信号的配置信息向基站发送所述辅助参考信号包括：
    根据辅助参考信号和主参考信号之间的映射信息，基于所述主参考信号获得所述辅助参考信号；以及
    向基站发送所生成的辅助参考信号。
  9. 如权利要求7所述的方法，其中
    所述配置信息包括辅助参考信号和主参考信号之间的映射信息，
    所述根据辅助参考信号的配置信息向基站发送所述辅助参考信号包括：
    根据辅助参考信号和主参考信号之间的映射信息获得多个候选参考信号；以及
    从所述多个候选参考信号中选择一个参考信号，将所选择的参考信号作为所述辅助参考信号发送给基站。
  10. 如权利要求1至6任一项所述的方法，还包括：
    根据通信系统的关于系统参数的预定阈值确定是否向通信系统中的基站发送辅助参考信号。
  11. 如权利要求1至6任一项所述的方法，
    其中所述根据辅助参考信号的配置信息向基站发送所述辅助参考信号包括：
    根据辅助参考信号的配置信息，使用不向基站发送辅助参考信号时用于发送数据的信道资源向基站发送辅助参考信号。
  12. 一种用于接收信号的方法，由通信系统中的基站执行，所述方法包括：
    从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号；以及
    根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据。
  13. 如权利要求12所述的方法，还包括：
    根据所检测的参考信号确定来自多个用户终端的信号是否发生了碰撞；
    其中所述根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据包括：
    当来自多个用户终端的信号没有发生碰撞时，从所述信号中检测各个用户终端的业务数据。
  14. 如权利要求13所述的方法，其中所述根据所检测的参考信号确定来自多个用户终端的信号是否发生了碰撞包括：
    分别判断每个用户终端的辅助参考信号的功率和主参考信号的功率是否相同；
    当存在用户终端的辅助参考信号的功率和主参考信号的功率不相同时， 确定来自多个用户终端的信号发生了碰撞。
  15. 如权利要求12至14任一项所述的方法，其中所述根据所检测的参考信号，从所述信号中检测各个用户终端的业务数据包括：
    使用所检测的主参考信号进行信道估计，从所述信号中检测未发送辅助参考信号的用户终端的业务数据；
    使用所检测的、发送辅助参考信号和主参考信号二者的用户终端的辅助参考信号和主参考信号进行信道估计，从所述信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据。
  16. 如权利要求15所述的方法，其中
    所述从所述信号中检测未发送辅助参考信号的用户终端的业务数据包括：
    通过串行干扰删除的方式从所述信号中检测未发送辅助参考信号的用户终端的业务数据，并对所检测的数据进行重构和删除；
    所述从所述信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据包括：
    通过串行干扰删除的方式从所述信号中检测所述发送辅助参考信号和主参考信号二者的用户终端的业务数据，并对所检测的数据进行重构和删除。
  17. 一种用户终端，包括：
    确定单元，被配置为根据关于所述用户终端的信道条件的信息确定是否向通信系统中的基站发送辅助参考信号；
    发送单元，被配置为向所述基站发送主参考信号，其中所述主参考信号用于所述用户终端与所述基站之间的信道估计；以及
    当所述确定单元确定向所述基站发送辅助参考信号时，所述发送单元被配置为根据辅助参考信号的配置信息向基站发送所述辅助参考信号。
  18. 一种基站，包括：
    检测单元，被配置为从来自一个或多个用户终端的信号中，检测各个用户终端的参考信号，其中所述参考信号包括主参考信号和/或辅助参考信号；以及
    所述检测单元还被配置为根据所检测的参考信号，从所述信号中检测各 个用户终端的业务数据。
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