WO2016041345A1 - 一种导频信息的反馈方法、装置及终端 - Google Patents

一种导频信息的反馈方法、装置及终端 Download PDF

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Publication number
WO2016041345A1
WO2016041345A1 PCT/CN2015/076311 CN2015076311W WO2016041345A1 WO 2016041345 A1 WO2016041345 A1 WO 2016041345A1 CN 2015076311 W CN2015076311 W CN 2015076311W WO 2016041345 A1 WO2016041345 A1 WO 2016041345A1
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WIPO (PCT)
Prior art keywords
pilot
measurement pilot
uplink
downlink
downlink measurement
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PCT/CN2015/076311
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English (en)
French (fr)
Inventor
陈艺戬
鲁照华
李儒岳
肖华华
赵晶
王瑜新
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ZTE Corp
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ZTE Corp
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Priority to US15/511,248 priority Critical patent/US10763934B2/en
Priority to EP15841762.6A priority patent/EP3197226A4/en
Publication of WO2016041345A1 publication Critical patent/WO2016041345A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • This document relates to the field of communications, and in particular to a method, device and terminal for feeding back pilot information in the field of wireless communications.
  • the transmitting end In a wireless communication system, the transmitting end often takes multiple antennas to obtain a higher transmission rate. Multiple antennas can improve the signal-to-noise ratio and support more spatial multiplexing layers.
  • the Open-End MIMO Multi-input Multi-output
  • MIMO technology using CSI information has higher capacity and is a transmission technology widely used in the mainstream 4G standard.
  • the core idea of the closed-loop MIMO precoding technology is that the receiving end feeds back the channel information to the transmitting end, and the transmitting end uses some transmitting precoding techniques according to the obtained channel information, which greatly improves the transmission performance.
  • the precoding with the channel feature vector information can be directly used for precoding.
  • more accurate channel information is needed for interference cancellation. Therefore, the acquisition of channel information at the transmitting end plays a very important role.
  • the general procedure for obtaining the downlink channel information of the FDD (Frequency Division Duplexing) system is as follows:
  • the transmitting end sends a downlink channel measurement pilot signal (CSI-RS, Channel State Information-Reference Signals) to the receiving end.
  • CSI-RS downlink channel measurement pilot signal
  • Each channel transmits a channel measurement pilot signal.
  • the channel measurement pilot signals transmitted by different antennas are staggered in the time-frequency domain or the code domain, and the orthogonality can be maintained without mutual interference.
  • Each antenna corresponds to one CSI-RS port (Port); the channel measurement Pilots are used to measure channel information.
  • CSI-RS transmission of the maximum 8 antenna port on the base station side is supported in LTE-A.
  • the base station also sends RRC (Radio Resource Control) signaling to configure relevant location information and transmission period information of the CSI-RS to the terminal.
  • the content of the transmission of the pilot signal on the base station side is determined by some pre-agreed rules, and the terminal can accurately know the content of the pilot signal transmission of each port at each time-frequency position on the base station side.
  • the terminal receives the configuration information of the channel measurement pilot signal CSI-RS sent by the base station side, and performs CSI-RS pilot signal reception and detection on the time-frequency resource position of the multiple pilot ports that are signaled, on the terminal side.
  • the received CSI-RS pilot signal is obtained on the root receiving antenna, and the terminal can accurately know the downlink pilot transmission because the terminal and the base station perform the convention of the content of the pilot transmitting signal at multiple time-frequency resource locations of the multiple transmitting ports.
  • the signal, and then the terminal can perform downlink channel estimation according to the received pilot signal to obtain downlink channel response information between the terminal side receiving antenna and the base station side transmitting antenna port.
  • LS Least Square
  • MMSE Minimum Mean Square Error
  • IRC Interference Rejection Combining
  • the terminal can estimate the channel response between the receiving antenna and the multiple transmitting antenna ports according to the content of the transmitted pilot signal of the multiple pilot ports and the received pilot signals on the multiple receiving antennas, so that multiple time-frequencys can be obtained.
  • the channel matrix corresponding to the resource location, and then the optimal CSI information can be calculated according to the channel matrix.
  • the CSI generally includes three types of PMI (Precoding Matrix Indicator)/CQI (Channel Quality Indicator)/RI (Rank Indicator) information.
  • the precoding matrix, the channel quality information, and the number of transmission layers are recommended to the base station respectively.
  • the terminal feeds back the calculated CQI/PMI/RI information to the base station through the control channel of the uplink physical layer or the data channel of the uplink physical layer.
  • the base station determines the number of transmission layers based on the feedback information of the terminal, determines the coding modulation mode, and determines the transmission precoding.
  • the downlink channel information measurement pilot CSI-RS plays a very important role in the acquisition of channel state information, and often affects the accuracy of precoding information, channel quality information and transmission layer number information, and thus for MIMO. Transmission performance has a very large impact.
  • the downlink CSI-RS pilots used in the 4G standard are periodic CSI-RS pilots.
  • the time domain considering that the channel changes are not abruptly changed, there is a certain time domain correlation, and the correlation time is greater than one subframe. The duration is 1ms, so it is not necessary to send all subframes. Since all UEs can share CSI-RS, CSI-RS is generally sent periodically.
  • the so-called periodic pilot the concept is that the base station performs CSI-RS transmission according to a certain periodic interval, and the transmission position may have different subframe position offsets.
  • the CSI-RS period and the subframe offset in the LTE-A are defined as follows:
  • the specification in the standard 36.211 of LTE is as shown in the following table, that is, CSI-reference signal subframe configuration.
  • the I CSI-RS is a configuration parameter of the CSI-RS, which takes a value of 0-154. Different values correspond to different CSI-RS periods and subframe offsets.
  • the PRB pair can refer to the provisions in the LTE protocol 36.211. A typical case includes 12 frequency domain subcarriers and 14 time domain OFDM symbols.
  • CSI-RS Resource units
  • the average CSI-RS pilot occupies 1 RE in a PRB pair, and all ports belonging to a CSI-RS resource need to be limited to a pattern #i shown in FIG.
  • a set of CSI-RS supports a maximum of 8 ports. Therefore, when the port is 8, there are five kinds of position candidates.
  • the number of ports is 4, there are 10 types of positions that can be configured.
  • the number of ports is 2, there are 20 configurations.
  • a base station side transmits a CSI-RS pilot
  • it is generally unable to undergo precoding processing.
  • the main reason is that multiple UEs in a cell share CSI-RS pilots, and if they are to be on a CSI-RS.
  • Precoding can only be precoded according to the channel characteristics of the base station to 1 UE, which will affect the measurement of other UEs.
  • Other UEs cannot accurately detect the physical channel between the Nr root receiving antenna and the Nt and the transmitting antenna, but according to The precoding performed by the characteristics of other UE channels may make it impossible to accurately calculate and report its own CSI information.
  • the pilot detection can be performed at the corresponding position.
  • the content of the aperiodic CSI-RS can be pre-acquired by the terminal, so it can be estimated.
  • the downlink channel response between the terminal receiving antenna and the base station transmitting antenna is obtained to obtain a channel matrix.
  • the resource pool is configured based on the resource pool to different user resources.
  • the aperiodic CSI-RS contention resource pool may be a set of periodic CSI-RS transmission resource locations.
  • the aperiodic CSI-RS is generally for a specific user, or a specific user group, rather than all users in the cell, so the aperiodic CSI-RS is a method that can support precoding, which can effectively reduce the number of ports, and can further Reduce the amount of calculation of CSI feedback. Therefore, the aperiodic CSI-RS can be selected to transmit in the form of precoded beam pilots or non-precoded non-beam pilots as needed.
  • pilot-related parameters are determined by the base station and configured for the terminal, or the terminal and the base station make some conventions, and relatively fixed parameters are adopted.
  • TDD Time Division Duplexing
  • the acquisition of downlink channel information is mainly obtained by means of reciprocity.
  • General acquisition of downlink channel information of TDD system The process is as follows:
  • the base station configures the uplink channel measurement pilot SRS (Sounding Reference Signals) for channel information measurement, and the base station can notify the location of the SRS transmission through the downlink physical layer control channel PDCCH signaling or the high layer RRC signaling, the transmission period, and the frequency domain occupation.
  • SRS Sounding Reference Signals
  • the SRS associated with bandwidth and the like sends information to the terminal.
  • the terminal receives the configuration signaling sent by the base station, and sends the SRS pilot according to the method indicated by the base station on the resource indicated by the base station.
  • the base station and the terminal agree on the content of the transmitted signal of the SRS at multiple time-frequency resource locations.
  • the base station receives the SRS pilot signal at the SRS transmission position of the multiple UEs. Because the base station can accurately learn the SRS pilot transmission signal, the base station can perform channel estimation according to the received pilot signal, and obtain uplink channel response information between the base station side receiving antenna and the terminal side transmitting antenna port. In the channel estimation, it is necessary to consider the influence of noise and interference when the actual pilot signal is received. It can be estimated by using LS, MMSE, IRC and other algorithms, and finally obtain the uplink of the number of the transmission ports of the multiple time-frequency resource locations. Channel matrix.
  • the base station performs channel reciprocity according to the obtained uplink channel matrix between the base station side receiving antenna and the terminal side transmitting antenna, and obtains a downlink channel matrix between the base station side transmitting antenna and the terminal side receiving antenna.
  • the downlink channel matrix information such as the number of transmission layers, precoding, channel quality, and the like can be determined.
  • the SRS is a pilot used by each terminal to measure channel information related to the terminal, and is a measurement pilot of the UE specific, which is a shared pilot of multiple users, and thus can be a precoded beam pilot. It can also be a non-precoded non-beam measurement pilot. Specifically, it can be determined according to measurement requirements and channel characteristics.
  • SRS is currently mainly designed based on SC-FDMA (Single-Carrier Frequency-Division Multiple Access) multiple access method. Limited by the single carrier characteristics of LTE-A uplink SC-FDMA, and the peak-to-average ratio limit of uplink, etc. The design of SRS is quite different from the design of downlink CSI-RS. Future uplink systems may also employ OFDMA access, so SRS designs may consider designs similar to downlink measurement pilots.
  • SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • a problem with the related art is that the terminal does not participate in the determination process of the pilot parameters, whether it is the transmission of the CSI-RS or the SRS, and is completely determined by the base station.
  • this method may not have a particularly significant performance penalty in a typical traditional scenario, but it is more demanding for scenarios with some special users or special needs, including delay requirements, robustness requirements, and CSI quantization accuracy requirements.
  • the terminal, or a scene that interferes with a particularly large number of users because the overall perception of the measurement pilot requirements by the base station is not as good as the terminal, and the terminal does not participate in the determination of the pilot parameters, which may result in loss of system performance.
  • the terminal has a more urgent need to participate in the determination of pilot parameters.
  • An embodiment of the present invention provides a method for feeding back pilot information, including:
  • the terminal feeds back the determined pilot parameters to the base station.
  • pilot parameters include one or more of the following:
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot is the transmission density of the uplink measurement pilot and/or the downlink measurement pilot
  • Uplink measurement pilot and/or downlink measurement pilot transmission power are uplink measurement pilot and/or downlink measurement pilot transmission power
  • the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot is the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Port identification selection information sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Precoding information corresponding to the uplink measurement pilot and/or the downlink measurement pilot port
  • Uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration are uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration
  • Uplink measurement pilot or downlink measurement pilot precoding or non precoding pilot attribute configuration is
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot includes:
  • Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB are examples of the Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB.
  • the location where the uplink measurement pilot and/or the downlink measurement pilot is sent includes any one of the following:
  • Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB
  • the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission is the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission.
  • the terminal determines a guide of the uplink measurement pilot and/or the downlink measurement pilot.
  • the step of the frequency parameter includes: determining, by the terminal, the pilot parameter with less interference in the pilot parameters of the optional uplink measurement pilot and/or the downlink measurement pilot according to the channel interference condition.
  • the determining, by the terminal, the pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot includes: The current moving speed or signal to noise ratio determines the transmission period of the uplink measurement pilot and/or downlink measurement pilot.
  • the determining, by the terminal, the pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot includes: The channel conditions determine pilot parameters for the uplink measurement pilot and/or the downlink measurement pilot.
  • the determining, by the terminal, the pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot includes: The current frequency selective fading condition or associated bandwidth selects the density of the physical resource block to the PRB pair or the density of the RE within the PRB pair.
  • the determining, by the terminal, the pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot includes: The terminal determines the transmission subframe position of the non-periodic pilot according to the time-varying speed of the channel and/or its own computing power.
  • the step of determining, by the terminal, the pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot includes: Determining uplink measurement pilot and/or downlink measurement pilot transmission based on a tradeoff between pilot overhead and performance The number of ports.
  • the embodiment of the invention further provides a feedback device for the pilot information, which is disposed on the terminal, and includes:
  • a parameter determining module configured to determine pilot parameters of an uplink measurement pilot and/or a downlink measurement pilot
  • the feedback module is configured to feed back the determined pilot parameters to the base station.
  • pilot parameters include one or more of the following:
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot is the transmission density of the uplink measurement pilot and/or the downlink measurement pilot
  • Uplink measurement pilot and/or downlink measurement pilot transmission power are uplink measurement pilot and/or downlink measurement pilot transmission power
  • the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot is the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Port identification selection information sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Precoding information corresponding to the uplink measurement pilot and/or the downlink measurement pilot port
  • Uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration are uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration
  • Uplink measurement pilot or downlink measurement pilot precoding or non precoding pilot attribute configuration is
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot includes:
  • Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB are examples of the Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB.
  • the location where the uplink measurement pilot and/or the downlink measurement pilot is sent includes any one of the following:
  • Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB
  • the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission is the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission.
  • the parameter determining module determines an uplink measurement pilot and/or a downlink measurement when the pilot parameter includes a subframe measurement offset and/or a transmitted subframe position of an uplink measurement pilot and/or a downlink measurement pilot.
  • Guide The pilot parameter of the frequency means that the parameter determining module determines the pilot parameter with less interference in the pilot parameters of the optional uplink measurement pilot and/or the downlink measurement pilot according to the channel interference condition.
  • the parameter determination module determines that a pilot parameter of an uplink measurement pilot and/or a downlink measurement pilot refers to The parameter determining module determines a transmission period of the uplink measurement pilot and/or the downlink measurement pilot according to a current moving speed or a signal to noise ratio.
  • the parameter determining module determines that the pilot parameter of the uplink measurement pilot and/or the downlink measurement pilot refers to The parameter determining module determines pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot according to channel conditions.
  • the parameter determination module determines that a pilot parameter of the uplink measurement pilot and/or the downlink measurement pilot refers to The parameter determining module selects the density of the physical resource block pair PRB pair or the density of the RE in the PRB pair according to the current frequency selective fading condition or the relevant bandwidth.
  • the parameter determination module determines a pilot parameter of an uplink measurement pilot and/or a downlink measurement pilot.
  • the parameter determining module determines the sending subframe position of the non-periodic pilot according to the time-varying speed of the channel and/or the computing power of the channel.
  • the parameter determining module determines that a pilot parameter of the uplink measurement pilot and/or the downlink measurement pilot is The parameter determination module determines, according to a tradeoff between pilot overhead and performance, the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot.
  • the embodiment of the invention further provides a terminal, including the above device.
  • the embodiment of the invention further provides a computer readable storage medium storing program instructions, which can be implemented when the program instructions are executed.
  • the base station can configure a more suitable CSI-RS or SRS for channel information measurement, which can improve system performance and resource utilization efficiency.
  • FIG. 2 is a schematic diagram of a CSI-RS Pattern in LTE
  • 3 is a schematic diagram of a periodic beam measurement pilot
  • 4 is a time-frequency domain location diagram of an aperiodic CSI-RS
  • FIG. 5 is a schematic flowchart of a pilot information feedback method according to Embodiment 1;
  • FIG. 5 is a schematic flowchart of a pilot information feedback method according to Embodiment 1;
  • Example 6 is a schematic diagram of a configuration of a candidate position of a PRB pair in a 1/3 bandwidth in Example 4;
  • FIG. 8 is a schematic structural diagram of a feedback device of pilot information according to Embodiment 2.
  • This embodiment describes a method for feeding back pilot information, as shown in FIG. 5, including:
  • the terminal determines pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot.
  • the terminal feeds back the determined pilot parameters to the base station.
  • the pilot parameters may include one or more of the following:
  • Uplink measurement pilot and/or downlink measurement pilot transmission power are uplink measurement pilot and/or downlink measurement pilot transmission power
  • the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot is the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Precoding information corresponding to the uplink measurement pilot and/or the downlink measurement pilot port
  • Uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration are uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration
  • the sending density of the uplink measurement pilot and/or the downlink measurement pilot may include:
  • Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB are examples of the Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB.
  • the location of the uplink measurement pilot and/or the downlink measurement pilot transmission may include any one of the following:
  • Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB
  • the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission is the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission.
  • the periodic pilot transmission period is a very important attribute in the pilot parameters, affecting the pilot overhead and channel measurement performance and affecting the overall system performance.
  • the base station and the terminal agree on the following candidate pilot period configuration as shown in Table 2.
  • the base station configures, for the terminal, a candidate pilot period configuration set, as shown in Table 3, for example, to configure one of the following four sets of the terminal, which belongs to the set custom mode, saves a certain signaling overhead and provides More reasonable flexibility.
  • the terminal performs time-varying estimation of the channel according to the current moving speed, or performs denaturing estimation according to the time domain channel change of the previous subframe to select appropriate configuration feedback to the base station:
  • the terminal when the terminal finds that the current mobile speed is fast, it can recommend that the base station send configuration information corresponding to the period of 5 ms to the base station. When the terminal finds that the mobile speed is slow, the terminal can feed back the configuration information corresponding to the recommended period of 80 ms to the base station. When there is almost no movement, the configuration information corresponding to the period of 320 ms can be recommended to the base station.
  • the accuracy of the channel information is limited by the non-time domain density factor, and a longer period such as 160 ms may be recommended to the base station.
  • a shorter period such as 5 ms may be recommended to the base station.
  • the transmit period parameter feedback recommendation of the periodic pilot can be used for the uplink measurement pilot transmission parameter and the transmission parameter of the downlink measurement pilot. It can be configured independently or using the same configuration signaling.
  • the pilot parameters are recommended to be fed back on the uplink data channel for periodic measurement pilots.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot. It is applicable to precoding measurement pilot and non-precoding measurement pilot. .
  • the subframe offset of the uplink or downlink periodic pilot is also a relatively important attribute of the pilot parameters, which affects the coordination of the pilot interference, so that the measurement pilot can avoid the strong interference subframe, and the base station and the terminal agree as follows.
  • the candidate pilot offset configuration is shown.
  • the terminal selects an appropriate subframe offset feedback to the base station according to the current interference situation, and the terminal may separately feed back the recommended parameters for the uplink or downlink measurement pilot.
  • the principle of choice is staggered interference. Strong subframe position to send measurement pilots.
  • the pilot parameters are recommended to be fed back on the uplink data channel, which is applicable to the periodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is applicable to the precoding measurement pilot and the non-precoding measurement pilot. .
  • the transmission density of the pilot is a very important attribute in the pilot parameters, affecting the overhead of the pilot and the channel measurement performance to affect the overall system performance.
  • the base station and the terminal agree on the following candidate pilot transmission density configuration.
  • the transmission density of pilots in all PRB pairs has been determined.
  • the density parameter configuration needs to be configured to transmit the density of the PRB pair. See Table 5:
  • the density of the PRB pair here refers to the number of RBs/the total number of RBs of the bandwidth, and the maximum is 1.
  • the terminal may select an appropriate PRB pair density feedback to the base station according to the current frequency domain selective fading condition or the related bandwidth, and the terminal may separately feed back the recommended parameters for the uplink or downlink measurement pilot.
  • the principle is that the stronger the frequency domain selectivity, the higher the density of the PRB pair, the weaker the frequency domain selective fading, and the smaller the density of the PRB pair.
  • the recommended pilot parameters can be fed back on the uplink data channel, and are applicable to the periodic measurement pilot and the aperiodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is applicable to the precoding measurement pilot. And non-precoded measurement pilots.
  • Example 3 For the determined PRB pair density in Example 3, such as the case of 1/3 bandwidth, there may be multiple PRB pair candidate locations, which may be configured by signaling. As shown in FIG. 6, there are three configuration schemes, as shown in the left, middle, and right columns of FIG. 6, respectively.
  • the configuration scheme corresponding to FIG. 6 is Table 6.
  • the configuration scheme corresponding to FIG. 7 is Table 7.
  • the configuration of the PRB pair location can coordinate the interference in the frequency domain, and the terminal can estimate the frequency domain location with less interference to the base station through the frequency domain interference analysis.
  • the transmission density of the pilot is a very important attribute in the pilot parameters, affecting the overhead of the pilot and the channel measurement performance to affect the overall system performance.
  • the base station and the terminal agree on the following candidate pilot transmission density configuration.
  • the other is that the PRB pair transmission position has been determined, but the transmission density of the pilot in the PRB pair needs to be configured.
  • the density of the PRB pair needs to be determined, as shown in Table 8:
  • the density unit here is RE/RB/Port, which refers to the average of each port in each RB. Use the number of REs.
  • the terminal selects the density of the REs in the appropriate PRB pair to feed back to the base station according to the frequency domain selective fading condition or the related bandwidth, and the terminal may respectively feed back the recommended parameters for the uplink or downlink measurement pilots.
  • the principle of selection is that the stronger the frequency domain selectivity, the greater the density of REs in the PRB pair, the weaker the frequency domain selective fading, and the smaller the pilot RE density in the PRB pair.
  • the increase in the density of the measurement pilot can use the correlation to suppress the noise interference, which is beneficial to improve the channel estimation performance. Therefore, the general selection principle may be that the worse the channel condition is, the higher the density of the RE in the PRB pair, the better the channel condition, and the smaller the pilot RE density in the PRB pair.
  • the recommended pilot parameters can be fed back on the uplink data channel, and are applicable to the periodic measurement pilot and the aperiodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is applicable to the precoding measurement pilot. And non-precoded measurement pilots.
  • the transmit power of the pilot is a very important attribute in the pilot parameters, affecting the inter-cell interference, the utilization efficiency of the power resources, and the channel measurement performance, thereby affecting the overall system performance.
  • the base station and the terminal agree as follows in Table 9 and Table 10.
  • the candidate pilot transmit power configuration is shown.
  • the density unit is a relative value of dB, which is the power offset relative to the downlink data channel and the uplink data channel, and the absolute value of the pilot power can also be configured. See Table 11 and Table 12:
  • Configuration 1 Configuration 2 Configuration 3 Configuration 4 Uplink measurement pilot transmit power 23dBm 20dB 17dBm 14dBm
  • the terminal recommends the configuration parameters of the pilot transmission power to the base station according to the error requirement of the channel estimation and the interference noise condition.
  • the lower the general channel conditions the lower the pilot transmit power can be recommended.
  • the higher the channel condition the higher the pilot transmit power can be recommended.
  • the recommended pilot parameters can be fed back on the uplink data channel, and are applicable to the periodic measurement pilot and the aperiodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is applicable to the precoding measurement pilot and Non-precoded measurement pilot
  • the transmission position of the pilot in the PRB pair is an important attribute in the pilot parameters, which affects the interference of the pilot.
  • the base station and the terminal agree on the transmission positions of the following candidate pilots in the PRB pair, as shown in Table 13.
  • Configuration 1 Configuration 2 Configuration 3 Configuration 4 Send location within the PRB pair Pattern 1 Pattern 2 Pattern 3 Pattern 4
  • the patterns 1, 2, 3, and 4 are determined by mutual agreement between the base station and the terminal, and may be other numbers of patterns.
  • the configuration of the pilot transmission location in the PRB pair can coordinate the interference, and the terminal can recommend the pattern corresponding to the location with less interference to the base station through the interference analysis.
  • the recommended pilot parameters can be fed back on the uplink data channel, and are applicable to the periodic measurement pilot and the aperiodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is applicable to the precoding measurement pilot and Non-precoded measurement pilot
  • the pilot transmission subframe of the aperiodic pilot is an important attribute in the pilot parameters, which affects the interference coordination performance, the channel estimation performance, and the CSI calculation capability requirement for the terminal.
  • the base station and the terminal agree on the following candidate guides as shown in Table 14. Frequency time domain location configuration.
  • Configuration 1 Configuration 2 Configuration 3 Configuration 4 Configuration 5 Configuration 6 Configuration 7 Configuration 8 Pilot relative trigger signaling subframe delay 1ms 2ms 3ms 4ms 5ms 6ms 8ms 10ms
  • the time domain position of the non-periodic pilot is agreed by the pilot relative trigger signaling subframe delay.
  • the terminal performs time-varying estimation of the channel according to the current moving speed, or performs time-varying estimation according to the time-domain channel variation of the previous subframe to select appropriate configuration feedback to the base station.
  • the terminal when the terminal finds that the current mobile speed is fast, it can recommend the configuration information corresponding to the pilot relative trigger signaling subframe delay of 2 ms to the base station. When the terminal finds that the moving speed is slow, the terminal can feed back the configuration information corresponding to the recommended delay of 5 ms.
  • the base station can recommend configuration information corresponding to the delay of 10 ms to the base station when the terminal finds that there is almost no current movement.
  • the terminal performs channel estimation by detecting pilots, and the quantization calculation of channel information also requires processing time, and different terminals have different processing capabilities. Therefore, in addition to considering the time-varying speed of the channel, the terminal should also consider its own computing power to recommend the transmission subframe position of the non-periodic pilot. Avoid problems that cause insufficient processing time.
  • the trigger subframe position parameter feedback recommendation of the non-periodic pilot can be used for the uplink pilot transmission parameter and the transmission parameter of the downlink pilot. It can be configured independently or using the same configuration signaling.
  • the recommended pilot parameters can be fed back on the uplink data channel and are applicable to the aperiodic measurement pilot.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is suitable for precoding measurement pilot and non-precoding measurement. Pilot.
  • the number of transmit ports of the non-periodic pilot and the periodic pilot is an important attribute in the pilot parameters, which affects the overhead of the pilot and the channel measurement performance, thereby affecting the performance of the entire system.
  • the base station and the terminal agree on the following candidate guides as shown in Table 15. The configuration of the number of frequency ports.
  • the number of pilot ports recommends that the terminal mainly considers the bottleneck of the current channel quantization accuracy. If there is a large multiplicative reception noise or other CSI quantization accuracy shortcomings, the feedback accuracy requirement of the high-dimensional antenna port cannot be met, resulting in High-dimensional precoding performance relative to low-dimensional precoding performance ⁇ When there is no advantage, the terminal can recommend the appropriate low-dimensional port number to match to the base station to avoid excessive pilot overhead.
  • the terminal also needs to give the recommended port ID feedback to the base station, for example, Table 16:
  • the recommended pilot parameters can be fed back on the uplink data channel, and are applicable to the periodic and aperiodic measurement pilots.
  • This example is applicable to the uplink measurement pilot and the downlink measurement pilot, and is suitable for precoding measurement pilot and non-pre-pre Coded measurement pilot
  • the attribute information of the aperiodic pilot and the periodic pilot is an important attribute in the pilot parameters, which affects the overhead of the pilot, the channel measurement performance, and the signaling overhead, thereby affecting the performance of the entire system.
  • the base station and the terminal agree as follows in Table 17 The configuration of the candidate pilot attributes is shown.
  • the periodic pilot does not need physical layer control signaling, has a long duration, does not require physical layer control signaling resources, and can utilize the time domain correlation of periodic pilots to suppress noise interference improvement performance during measurement. But the biggest problem is that the pilot overhead is large and wasteful.
  • Non-periodic pilots do not require physical layer control signaling, and have good real-time performance and high utilization of pilot resources, but The overhead of control signaling is large. More signaling is needed for non-periodic pilot parameter configuration and triggering.
  • the attribute information of the precoded pilot and the non-precoded pilot is an important attribute in the pilot parameters, which affects the overhead of the pilot, the channel measurement performance, and the signaling overhead, thereby affecting the performance of the entire system.
  • the base station and the terminal agree as follows.
  • the precoding pilot has better performance for the terminal that can be covered, and the pilot resource utilization rate is high, but the terminal coverage hole problem is prone to occur. If it is not within the range of the beam pilot, it may not be possible. The situation of the measurement. Non-precoded pilots have poor performance and low resource utilization, but generally have a wide coverage.
  • the terminal may recommend whether to use precoded pilots or non-precoded pilots depending on whether the channel matches the precoding pilot.
  • the base station should recommend one or more precoded pilot weights that can cover the terminal to the base station.
  • This embodiment describes a feedback device for the pilot information, which is disposed in the terminal, as shown in FIG. 8, and includes a parameter determining module 201 and a feedback module 202, where:
  • the feedback module 202 is configured to feed back the determined pilot parameters to the base station.
  • the pilot parameters may include one or more of the following:
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot is the transmission density of the uplink measurement pilot and/or the downlink measurement pilot
  • Uplink measurement pilot and/or downlink measurement pilot transmission power are uplink measurement pilot and/or downlink measurement pilot transmission power
  • the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot is the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Port identification selection information sent by the uplink measurement pilot and/or the downlink measurement pilot
  • Precoding information corresponding to the uplink measurement pilot and/or the downlink measurement pilot port
  • Uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration are uplink measurement pilot and/or downlink measurement pilot period or non-periodic pilot attribute configuration
  • Uplink measurement pilot or downlink measurement pilot precoding or non precoding pilot attribute configuration is
  • the transmission density of the uplink measurement pilot and/or the downlink measurement pilot includes:
  • Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB are examples of the Uplink measurement pilot and/or downlink measurement pilot transmission density within the RB.
  • the parameter determination module 201 determines a pilot parameter of an uplink measurement pilot and/or a downlink measurement pilot. Refers to:
  • the parameter determining module 201 selects the density of the physical resource block pair PRB pair or the density of the REs in the PRB pair according to the current frequency selective fading condition or the related bandwidth.
  • the location of the uplink measurement pilot and/or the downlink measurement pilot transmission includes any one of the following:
  • Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB Uplink measurement pilot and/or downlink measurement pilot transmission location within the RB
  • the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission is the time domain location of the uplink measurement pilot and/or downlink measurement pilot transmission.
  • the parameter determination module 201 determines a guide of an uplink measurement pilot and/or a downlink measurement pilot.
  • the frequency parameter means:
  • the parameter determination module 201 determines the transmission subframe position of the non-periodic pilot according to the time-varying speed of the channel and/or the computing power of the channel.
  • the parameter determining module 201 determines pilot parameters with less interference in the pilot parameters of the optional uplink measurement pilot and/or downlink measurement pilot according to the channel interference condition.
  • the parameter determination module 201 determines an uplink measurement pilot and/or a downlink measurement guide.
  • the frequency pilot parameters are:
  • the parameter determination module 201 determines an uplink measurement pilot and/or a downlink measurement guide.
  • the frequency pilot parameters are:
  • the parameter determination module determines pilot parameters of the uplink measurement pilot and/or the downlink measurement pilot according to channel conditions.
  • the parameter determination module 201 determines an uplink measurement pilot and/or a downlink measurement.
  • the pilot parameters of the pilot are:
  • the parameter determination module 201 determines the number of ports sent by the uplink measurement pilot and/or the downlink measurement pilot according to a tradeoff between pilot overhead and performance.
  • This embodiment provides a terminal, including the apparatus described in Embodiment 2. See the description in the second embodiment, and details are not described here.
  • the base station can configure a more suitable CSI-RS or SRS for channel information measurement, which can improve system performance and resource utilization efficiency.

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Abstract

本发明实施例提供了一种导频信息的反馈方法、装置及终端；所述方法包括：终端确定上行测量导频和/或下行测量导频的导频参数；终端反馈所确定的导频参数给基站。

Description

一种导频信息的反馈方法、装置及终端 技术领域
本文涉及通信领域，尤其涉及无线通信领域中一种导频信息的反馈方法、装置及终端。
背景技术
无线通信系统中，发送端经常会采取使用多根天线以获取更高的传输速率。多根天线能够带来信噪比的提升以及支持更多的空间复用层数，相对于发送端不使用CSI(Channel State Informatio，信道状态信息)的开环MIMO(Multi-input Multi-output，多输入多输出)技术，使用CSI信息的MIMO技术(闭环MIMO预编码(Precoding))会有更高的容量，是目前主流的4G标准广泛使用的一种传输技术。闭环MIMO预编码技术的核心思想是接收端反馈信道信息给发送端，发送端根据获得的信道信息使用一些发射预编码技术，极大的提高传输性能。对于单用户MIMO中，可以直接使用与信道特征矢量信息比较匹配的预编码矢量进行发送预编码；对于多用户MIMO中，也需要比较准确的信道信息进行干扰消除。因此发送端信道信息的获取有着非常重要的作用。
在4G的一些技术如LTE/LTE-A，802.16m标准规范中，FDD(Frequency Division Duplexing，频分双工)系统下行信道信息的获取的一般流程如下：
S1：发送端(基站)发送下行信道测量导频信号(CSI-RS,Channel State Information–Reference Signals)给接收端，一般来说每根天线发送一份信道测量导频信号。不同天线发送的信道测量导频信号在时频域或码域上位置是错开的，能够保持正交性不受到互相的干扰，每根天线分别对应一个CSI-RS端口(Port)；该信道测量导频用于测量信道信息。在LTE-A中支持基站侧最大8天线端口的CSI-RS发送。基站还发送RRC(Radio Resource Control，无线资源控制)信令配置CSI-RS的相关位置信息和发送周期信息给终端。基站侧导频信号的发送内容由预先约定的一些规则确定，终端能准确的获知基站侧每个端口在每个时频位置的导频信号发送内容。
S2：终端接收基站侧发送的信道测量导频信号CSI-RS的配置信息，在信令通知的多个导频端口发送时频资源位置进行CSI-RS导频信号接收与检测，在终端侧每根接收天线上均获得接收的CSI-RS导频信号，由于终端与基站进行了多个发送端口多个时频资源位置上导频发送信号内容的约定，因此终端能够准确的获知下行导频发送信号，进而终端根据接收到的导频信号就可以进行下行信道估计获得终端侧接收天线与基站侧发送天线端口间的下行信道响应信息。在下行信道估计时需要考虑实际的导频信号接收时掺杂了噪声及干扰的影响，可以采用LS(Least Square，最小二乘)，MMSE(Minimum Mean Square Error，最小均方误差)，IRC(Interference Rejection Combining，干扰拒绝合并)等算法进行信道估计，最终得到多个时频资源位置上域发送端口数匹配的下行信道矩阵。
S3：终端根据多个导频端口的发送导频信号内容与多个接收天线上的接收导频信号，可以估计接收天线与多个发射天线端口之间的信道响应，即可得到多个时频资源位置对应的信道矩阵，进而可以根据信道矩阵计算最优的CSI信息。CSI一般包括PMI(Precoding Matrix Indicator，预编码矩阵指示)/CQI(channel quality indicator，信道质量指示)/RI(Rank Indicator，秩指示)信息三种类型。分别向基站反馈推荐了预编码矩阵，信道质量信息和传输层数。终端通过上行物理层的控制信道或者上行物理层的数据信道将计算得到的CQI/PMI/RI信息反馈给基站。基站基于终端的反馈信息进行传输层数的确定，编码调制方式确定及发送预编码的确定。
可以看到其中下行信道信息测量导频CSI-RS在信道状态信息的获取过程中有着非常重要的作用，往往影响到预编码信息，信道质量信息和传输层数信息的准确性，进而对MIMO的传输性能有非常大的影响。
4G标准中采用的下行CSI-RS导频均为周期CSI-RS导频，在时域上，考虑到信道的变化并不是突然变化的，具有一定的时域相关性，相关时间大于一个子帧的持续时间1ms，因此不必要所有子帧都进行发送。由于所有UE可以共享CSI-RS，因此CSI-RS一般周期发送。所谓周期导频，其概念是基站按照某个周期间隔进行CSI-RS发送，发送位置可以有不同的子帧位置偏置，例如LTE-A中的CSI-RS周期及子帧偏置定义如下：
在LTE的标准36.211中的规定如下表所示，即CSI-RS子帧构造(CSI reference signal subframe configuration.)。
表1、CSI-RS子帧构造
Figure PCTCN2015076311-appb-000001
表中，ICSI-RS是CSI-RS的配置参数，取值0-154，不同的取值会对应不同的CSI-RS的周期和子帧偏置。图1示出了为部分CSI-RS配置示例对应的子帧位置发送示意图，分别对应ICSI-RS＝0，ICSI-RS＝2，ICSI-RS＝5的配置。
在频域位置上，每个PRB(物理资源块)pair(对)内都存在CSI-RS，相同的Port在不同的PRB pair内的发送图样相同。CSI-RS的式样(pattern)如图2所示。PRB pair可以参考LTE协议36.211中的规定，典型的情况包括12个频域的子载波和14个时域OFDM符号。
LTE系统中定义了一个PRB pair内有40个RE(资源单元)可以被用做CSI-RS，被分为了5个pattern，每个pattern包含8个RE，如上图所示。CSI-RS导频平均每个Port在一个PRB pair内占用1个RE，属于一份CSI-RS资源(resource)的所有Port需要限制在一个图2所示的图样#i内。目前一套CSI-RS支持的Port数最大为8，因此在Port为8时，有5种位置候选，在Port数为4时，有10种位置可配置。Port数为2时，有20种配置。
相关技术LTE-A系统中基站端发射CSI-RS导频时一般是不能经过预编码处理的，主要原因是，小区内的多个UE共享CSI-RS导频，而如果要在CSI-RS上做预编码只能根据基站到1个UE的信道特征来进行预编码，会影响其他UE的测量，其他UE不能准确的测到Nr根接收天线和Nt跟发送天线之间的物理信道，而根据其他UE信道的特性进行的预编码会使得其不能准确的计算上报自己的CSI信息。当然，在目前讨论的大规模天线通信系统中， 当天线数目非常多时，为了尽可能的节约导频开销和减少反馈复杂度，在一些多径散射比较小的场景，基站也是可以发送周期的预编码CSI-RS导频的，一般称带预编码的CSI-RS为波束测量导频。图3给出了一种周期波束导频的发送策略，每个波束导频的能量集中在某个方向，形成方向性的波束，每间隔一段时间周期的发送一个波束测量导频。在一组波束导频之间进行轮循。
除了上面描述的周期CSI-RS导频，近期新提出了非周期CSI-RS导频。非周期CSI-RS是一种即时触发的导频，该导频一般动态的、针对特定UE或UE组的信道测量进行发送，不会持续发送，只存在于一个子帧中。因此在下行控制信道PDCCH或增强下行控制信道Enhanced-PDCCH(ePDCCH)中携带非周期导频触发信息。
终端获知了非周期CSI-RS的发送位置后可以在对应位置上进行导频检测，与周期CSI-RS一样，非周期CSI-RS的发送内容可以是可以由终端预先获取的，因此可以估计出终端接收天线与基站发送天线之间的下行信道响应，从而获取信道矩阵。
存在两种典型的非周期导频发送方式，一种是在需要使用非周期CSI-RS进行测量的用户的PDSCH中进行传输，另外一种是在小区内分配所有用户的非周期CSI-RS竞争资源池，再基于该资源池配置给不同用户资源。如图4所示，非周期CSI-RS竞争资源池可以是一套周期CSI-RS的发送资源位置。
注意到非周期CSI-RS一般是面向特定用户的，或特定的用户组，而不是小区内所有用户，因此非周期CSI-RS是可以支持预编码的方法，能够有效的降低Port数目，可以进一步降低CSI反馈的计算量。因此，非周期CSI-RS可以根据需要选择是以预编码的波束导频形式发送还是以非预编码的非波束导频形式发送。
前面介绍了相关技术的一些测量导频发送的基础知识，包括的周期导频非周期导频预编码导频和非预编码导频。在相关技术中所有与导频相关的参数都是基站进行确定并配置给终端，或者终端与基站进行一些约定，采用比较固定的参数。
对于TDD(Time Division Duplexing，时分双工)系统来说，下行信道信息的获取主要通过互易性的方式得到。TDD系统下行信道信息的获取的一般 流程如下：
B1：基站配置上行信道测量导频SRS(Sounding Reference Signals)用于信道信息测量，基站可以通过下行物理层控制信道PDCCH信令或者高层RRC信令通知SRS发送的位置，发送的周期，频域占用带宽等等相关的SRS发送信息给终端。
B2：终端接收基站发送的配置信令，在基站所指示的资源上按照基站指示的方法发送SRS导频。基站与终端约定好在多个时频资源位置上SRS的发送信号内容。
B3：基站在多个UE的SRS发送位置上接收SRS导频信号。因为基站端能够准确的获知SRS导频发送信号，进而基站根据接收到的导频信号就可以进行信道估计，获得基站侧接收天线与终端侧发送天线端口间的上行信道响应信息。在信道估计时需要考虑实际的导频信号接收时掺杂了噪声及干扰的影响，可以采用LS，MMSE，IRC等算法进行估计，最终得到多个时频资源位置上域发送端口数匹配的上行信道矩阵。
B4：基站根据获得的基站侧接收天线与终端侧发送天线之间的上行信道矩阵进行信道互易，得到基站侧发送天线与终端侧接收天线之间的下行信道矩阵。根据下行信道矩阵即可进行传输层数，预编码，信道质量等信息的判断。
可以看到其中上行信道测量导频SRS在上下行信道状态信息的获取过程中有着非常重要的作用，往往影响到预编码信息，信道质量信息和传输层数信息的准确性，进而对MIMO的传输性能有非常大的影响。
SRS由于是每个终端发送的用于本终端相关信道信息测量的导频，是UE specific(特性)的测量导频，非多个用户的共享导频，因此既可以是预编码的波束导频，也可以是非预编码的非波束测量导频。具体可以根据测量需求及信道特征等确定。
在LTE-A标准中，SRS目前主要考虑基于SC-FDMA(Single-carrier Frequency-Division Multiple Access，单载波频分多址)的多址接入方式进行设计。受限于LTE-A上行SC-FDMA的单载波特性，及上行的峰均比限制等， SRS的设计与下行CSI-RS的设计有较大的区别。未来的上行系统也可能采用OFDMA接入方式，因此SRS设计可能会考虑与下行测量导频类似的设计。
相关技术存在的一个问题是：不管是CSI-RS还是SRS的发送，终端并没有参与导频参数的确定过程，完全由基站确定。对于周期导频，在一般传统场景可能这种方法不会有特别明显的性能损失，但对与存在一些特殊用户或特殊需求的场景，包括延迟需求，鲁棒性需求及CSI量化精度需求比较苛刻的终端，或者干扰特别大用户特别多的场景，由于基站对测量导频需求的总体感知不如终端，终端不参与导频参数的确定会带来系统性能的损失。尤其是对于非周期导频来说，终端有更加迫切的参与导频参数确定的需求。
发明内容
本发明实施例提供了一种导频信息的反馈方法，包括：
终端确定上行测量导频和/或下行测量导频的导频参数；
终端反馈所确定的导频参数给基站。
可选地，所述导频参数包括以下一种或多种：
上行测量导频和/或下行测量导频的发送周期或子帧偏置；
上行测量导频和/或下行测量导频的发送密度；
上行测量导频和/或下行测量导频的发送功率；
上行测量导频和/或下行测量导频发送的位置；
上行测量导频和/或下行测量导频发送的端口数；
上行测量导频和/或下行测量导频发送的端口标识选择信息；
上行测量导频和/或下行测量导频端口对应的预编码信息；
上行测量导频和/或下行测量导频周期或非周期导频属性配置；
上行测量导频或下行测量导频预编码或非预编码导频属性配置。
可选地，所述上行测量导频和/或下行测量导频的发送密度包括：
上行测量导频和/或下行测量导频发送资源块RB密度或带宽；或者，
RB内的上行测量导频和/或下行测量导频发送密度。
可选地，所述上行测量导频和/或下行测量导频发送的位置包括以下任一种：
上行测量导频和/或下行测量导频发送RB位置；
RB内的上行测量导频和/或下行测量导频发送位置；
上行测量导频和/或下行测量导频发送的时域位置。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的子帧偏置和/或发送的位置时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据信道干扰情况，在可选的上行测量导频和/或下行测量导频的导频参数中，确定干扰较小的导频参数。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送周期时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据当前移动速度或信噪比确定所述上行测量导频和/或下行测量导频的发送周期。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送功率时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据信道条件确定上行测量导频和/或下行测量导频的导频参数。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送密度时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据当前的频率选择性衰落情况或相关带宽选择物理资源块对PRB pair的密度或PRB pair内RE的密度。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频发送的时域位置时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据信道的时变快慢和/或自身的计算能力确定非周期导频的发送子帧位置。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频发送的端口数时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：终端根据导频开销与性能的折衷确定上行测量导频和/或下行测量导频发送 的端口数。
本发明实施例还提供了一种导频信息的反馈装置，设置于终端，包括：
参数确定模块，设置为确定上行测量导频和/或下行测量导频的导频参数；以及
反馈模块，设置为反馈所确定的导频参数给基站。
可选地，所述导频参数包括以下一种或多种：
上行测量导频和/或下行测量导频的发送周期或子帧偏置；
上行测量导频和/或下行测量导频的发送密度；
上行测量导频和/或下行测量导频的发送功率；
上行测量导频和/或下行测量导频发送的位置；
上行测量导频和/或下行测量导频发送的端口数；
上行测量导频和/或下行测量导频发送的端口标识选择信息；
上行测量导频和/或下行测量导频端口对应的预编码信息；
上行测量导频和/或下行测量导频周期或非周期导频属性配置；
上行测量导频或下行测量导频预编码或非预编码导频属性配置。
可选地，所述上行测量导频和/或下行测量导频的发送密度包括：
上行测量导频和/或下行测量导频发送资源块RB密度或带宽；或者，
RB内的上行测量导频和/或下行测量导频发送密度。
可选地，所述上行测量导频和/或下行测量导频发送的位置包括以下任一种：
上行测量导频和/或下行测量导频发送RB位置；
RB内的上行测量导频和/或下行测量导频发送位置；
上行测量导频和/或下行测量导频发送的时域位置。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的子帧偏置和/或发送的位置时，所述参数确定模块确定上行测量导频和/或下行测量导 频的导频参数是指：所述参数确定模块根据信道干扰情况，在可选的上行测量导频和/或下行测量导频的导频参数中，确定干扰较小的导频参数。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送周期时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：所述参数确定模块根据当前移动速度或信噪比确定所述上行测量导频和/或下行测量导频的发送周期。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送功率时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：所述参数确定模块根据信道条件确定上行测量导频和/或下行测量导频的导频参数。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频的发送密度时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：所述参数确定模块根据当前的频率选择性衰落情况或相关带宽选择物理资源块对PRB pair的密度或PRB pair内RE的密度。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频发送的时域位置时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：所述参数确定模块根据信道的时变快慢和/或自身的计算能力确定非周期导频的发送子帧位置。
可选地，当所述导频参数包括上行测量导频和/或下行测量导频发送的端口数时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：所述参数确定模块根据导频开销与性能的折衷确定上行测量导频和/或下行测量导频发送的端口数。
本发明实施例还提供了一种终端，包括上述的装置。
本发明实施例还提供一种计算机可读存储介质，存储有程序指令，当该程序指令被执行时可实现上述方法。
通过本发明实施例描述的方案，基站能够配置更加适合的CSI-RS或SRS用于信道信息的测量，可以提高系统的性能和资源利用效率。
附图概述
图1是CSI-RS配置示例对应的子帧位置发送示意图；
图2是LTE中CSI-RS Pattern示意图；
图3是周期波束测量导频的示意图；
图4是非周期CSI-RS时频域位置图；
图5是实施例一导频信息反馈方法的流程示意图；
图6是例4中1/3带宽时PRB pair候选位置的配置示意图；
图7是例4中1/4带宽时PRB pair候选位置的配置示意图；
图8是实施例二导频信息的反馈装置结构示意图。
本发明的实施方式
需要说明的是，如果不冲突，本发明实施例以及实施例中的各个特征可以相互结合。另外，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
实施例一
本实施例描述一种导频信息的反馈方法，如图5所示，包括：
101、终端确定上行测量导频和/或下行测量导频的导频参数；
102、终端反馈所确定的导频参数给基站。
本实施例中，所述导频参数可以包括以下一种或多种：
上行测量导频和/或下行测量导频的发送周期或子帧偏置；
上行测量导频和/或下行测量导频的发送密度；
上行测量导频和/或下行测量导频的发送功率；
上行测量导频和/或下行测量导频发送的位置；
上行测量导频和/或下行测量导频发送的端口数；
上行测量导频和/或下行测量导频发送的端口ID(标识)选择信息；
上行测量导频和/或下行测量导频端口对应的预编码信息；
上行测量导频和/或下行测量导频周期或非周期导频属性配置；
上行测量导频或下行测量导频预编码或非预编码导频属性配置。
本实施例的一种实施方式中，所述上行测量导频和/或下行测量导频的发送密度可以包括：
上行测量导频和/或下行测量导频发送RB密度或带宽；或者，
RB内的上行测量导频和/或下行测量导频发送密度。
本实施例的一种实施方式中，所述上行测量导频和/或下行测量导频发送的位置可以包括以下任一种：
上行测量导频和/或下行测量导频发送RB位置；
RB内的上行测量导频和/或下行测量导频发送位置；
上行测量导频和/或下行测量导频发送的时域位置。
下面用几个应用示例来详细说明本实施例。
示例1：
周期导频的发送周期是导频参数中的一个非常重要属性，影响到了导频的开销和信道测量性能从而影响整个系统性能，基站与终端约定以下如表2所示候选导频周期配置。
表2、候选导频周期配置
  配置1 配置2 配置3 配置4 配置5 配置6 配置6
导频周期 5ms 10ms 20ms 40ms 80ms 160ms 320ms
或者基站给终端配置如表3所示候选导频周期配置集合，例如配置给终端以下4个集合中的一种集合，这种方式属于集合自定义的方式，节约了一定信令开销又提供了较合理的灵活性。
表3、候选导频周期配置集合
  配置1 配置2 配置3 配置4
集合1 40ms 80ms 160ms 320ms
集合2 10ms 20ms 40ms 80ms
集合3 20ms 40ms 80ms 160ms
集合4 5ms 10ms 20ms 40ms
终端根据当前移动速度进行信道的时变性估计，或者根据之前子帧的时域信道变化情况进行是变性估计选出合适的配置反馈给基站：
比如：当终端发现当前移动速度较快时可以推荐基站发送周期为5ms对应的配置信息给基站，当终端发现移动速度较慢时可以反馈推荐周期为80ms对应的配置信息给基站，当终端发现当前几乎无移动时可以推荐周期为320ms对应的配置信息给基站。
又例如：当终端干扰较大，信噪比低时，对信道信息精度受限于非时域密度因素，可以推荐较长周期如160ms给基站。当终端信道条件非常好，对CSI精度要求较高时，可以推荐较短的周期如5ms给基站。
周期导频的发送周期参数反馈推荐可以用于上行测量导频发送参数也可以用于下行测量导频的发送参数。可以是独立配置或者使用相同的配置信令。
本例推荐导频参数可以在上行数据信道上进行反馈，用于周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例2：
上行或下行周期导频的子帧偏置也是导频参数中的一个比较重要属性，影响到了导频干扰的协调，使得测量导频可以避开强干扰子帧，基站与终端约定以下如表4所示候选导频偏置配置。
表4、候选导频偏置配置
  偏置1 配置2 配置3 配置4 配置5
5ms周期导频 0子帧 1子帧 2子帧 3子帧 4子帧
10ms周期导频 0子帧 2子帧 4子帧 6子帧 8子帧
20ms周期导频 0子帧 4子帧 8子帧 12子帧 16子帧
…… … … … … …
终端根据当前的干扰情况选择合适的子帧偏置反馈给基站，终端可以针对上行或下行测量导频分别反馈推荐参数。一般来说选择的原则是错开干扰 强的子帧位置来发送测量导频。
本例推荐导频参数可以在上行数据信道上进行反馈，适用于周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例3：
导频的发送密度是导频参数中的一个非常重要属性，影响到了导频的开销和信道测量性能从而影响整个系统性能，基站与终端约定以下候选导频发送密度配置。
一种情况是所有PRB pair内的导频的发送密度已经确定，密度参数配置需要配置发送PRB pair的密度，见表5：
表5、PRB pair密度配置
Figure PCTCN2015076311-appb-000002
这里PRB pair的密度指的是RB数目/整个带宽RB数目，最大为1。
终端可以根据当前的频域选择性衰落情况或相关带宽选择合适的PRB pair密度反馈给基站，终端可以针对上行或下行测量导频分别反馈推荐参数。一般来说选择的原则是频域选择性越强，PRB pair的密度越大，频域选择性衰落越弱，PRB pair的密度越小。
本例推荐导频参数可以在在上行数据信道上进行反馈，适用于周期测量导频及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例4：
针对示例3中的确定的PRB pair密度，比如1/3带宽的情况，可以存在多种PRB pair候选位置，可以通过信令进行配置。如图6所示有三种配置方案，分别如图6中的左、中、右三列所示。
图6对应的配置方案为表6。
表6、1/3带宽时的PRB pair位置配置
  配置1 配置2 配置3
PRB pair位置 RB index Mod 3＝0 RB index Mod 3＝1 RB index Mod 3＝2
PRB pair位置 RB index 1～M/3 RB index M/3+1～2M/3 RB index 2M/3+1～M
PRB pair位置 RB index Mod 6＝0,1 RB index Mod 6＝2,3 RB index Mod 6＝4,5
1/4带宽的情况，可以存在多种PRB pair候选位置，可以通过信令进行配置。如图7所示有两种配置方案，分别如图7中的左、右两列所示。
图7对应的配置方案为表7。
表7、1/4带宽时的PRB pair位置配置
Figure PCTCN2015076311-appb-000003
PRB pair位置的配置可以协调频域的干扰，终端通过频域干扰分析，可以推荐干扰较小的频域位置给基站。
本例推荐导频参数可以在在上行数据信道上进行反馈，适用于周期测量导频及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例5：
导频的发送密度是导频参数中的一个非常重要属性，影响到了导频的开销和信道测量性能从而影响整个系统性能，基站与终端约定以下候选导频发送密度配置。
除了示例3中所描述的情况，另外一种是PRB pair发送位置已经确定，但PRB pair内的导频的发送密度需要配置，此时需要确定PRB pair的密度，见表8：
表8、PRB pair密度配置
  配置1 配置2 配置3 配置4
PRB pair内导频密度 1RE/RB/Port 2RE/RB 4RE/RB 8RE/RB
这里密度单位为RE/RB/Port，指的是平均每个RB内每个Port的平均占■ 用RE数目。
终端根据频域选择性衰落情况或相关带宽选择合适的PRB pair内RE的密度反馈给基站，终端可以针对上行或下行测量导频分别反馈推荐参数。一般来说选择的原则是频域选择性越强，PRB pair内RE的密度越大，频域选择性衰落越弱，PRB pair内的导频RE密度越小。
另外测量导频的密度增加可以利用相关性压制噪声干扰，有利于提高信道估计性能。因此一般来说选择的原则可以是信道条件越差，PRB pair内RE的密度越大，信道条件越好，PRB pair内的导频RE密度越小。
本例推荐导频参数可以在在上行数据信道上进行反馈，适用于周期测量导频及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例6：
导频的发送功率是导频参数中的一个非常重要属性，影响到了小区间干扰，功率资源的利用效率，和信道测量性能从而影响整个系统性能，基站与终端约定以下如表9和表10所示候选导频发送功率配置。
表9、下行测量导频发送功率配置
Figure PCTCN2015076311-appb-000004
表10、上行测量导频发送功率配置
Figure PCTCN2015076311-appb-000005
这里密度单位为dB是一个相对值，分别是相对于下行数据信道和上行数据信道的功率偏置，也可以配置导频功率绝对值，见表11和表12：
表11、下行测量导频发送功率配置
  配置1 配置2 配置3 配置4
下行测量导频发送功率 43dBm 40dBm 23dBm 20dBm
表12、上行测量导频发送功率配置
  配置1 配置2 配置3 配置4
上行测量导频发送功率 23dBm 20dB 17dBm 14dBm
终端根据信道估计的误差需求及干扰噪声情况向基站推荐导频发送功率的配置参数。一般信道条件越好的情况下可以推荐越低的导频发送功率。信道条件越差的情况下可以推荐越高的导频发送功率。
本例推荐导频参数可以在上行数据信道上进行反馈，适用于周期测量导频及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频
示例7：
导频在PRB pair内的发送位置是导频参数中的一个重要属性，影响到了导频的干扰情况，基站与终端约定以下候选导频在PRB pair内的发送位置，见表13。
表13、PRB pair内的发送位置配置
  配置1 配置2 配置3 配置4
PRB pair内的发送位置 图样1 图样2 图样3 图样4
这里图样1、2、3、4由基站和终端互相协商确定，也可以是其他数目的图样。
PRB pair内的导频发送位置的配置可以协调干扰，终端通过干扰分析，可以推荐干扰较小的位置对应的图样给基站。
本例推荐导频参数可以在上行数据信道上进行反馈，适用于周期测量导频及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频
示例8：
非周期导频的导频发送子帧是导频参数中的一个重要属性，影响到了干扰协调性能，信道估计性能以及对终端的CSI计算能力要求，基站与终端约定以下如表14所示候选导频时域位置配置。
表14、导频时域位置配置
  配置1 配置2 配置3 配置4 配置5 配置6 配置7 配置8
导频相对触发信令子帧延迟 1ms 2ms 3ms 4ms 5ms 6ms 8ms 10ms
这里以导频相对触发信令子帧延迟来约定非周期导频的时域位置。
终端根据当前移动速度进行信道的时变性估计，或者根据之前子帧的时域信道变化情况进行时变性估计选出合适的配置反馈给基站。
比如：当终端发现当前移动速度较快时可以推荐导频相对触发信令子帧延迟为2ms对应的配置信息给基站，当终端发现移动速度较慢时可以反馈推荐延迟为5ms对应的配置信息给基站，当终端发现当前几乎无移动时可以推荐延迟为10ms对应的配置信息给基站。
除了考虑移动速度方面，终端在检测导频进行信道估计，以及信道信息的量化计算也是需要处理时间的，不同的终端有不同的处理能力。因此终端除了需要考虑信道的时变快慢以外还要考虑自身的计算能力来推荐非周期导频的发送子帧位置。避免造成处理时间不够的问题。
非周期导频的触发子帧位置参数反馈推荐可以用于上行导频发送参数也可以用于下行导频的发送参数。可以是独立配置或者使用相同的配置信令。
本例推荐导频参数可以在在上行数据信道上进行反馈，适用于非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频。
示例9：
非周期导频和周期导频的发送端口数目是导频参数中的一个重要属性，影响到了导频的开销和信道测量性能从而影响整个系统性能，基站与终端约定以下如表15所示候选导频端口数目的配置。
表15、导频端口数目配置
  配置1 配置2 配置3 配置4 配置5 配置6 配置7
周期导频端口数 1Port 2Port 4Port 8Port 16Port 32Port 64Port
导频的端口数目推荐终端主要考虑当前的信道量化精度的瓶颈，如果存在较大的乘性接收噪声或者存在其他方面的CSI量化精度短板，造成无法满足高维天线端口的反馈精度需求，造成高维预编码性能相对低维预编码性能■ 没有优势时，则终端可以推荐与其匹配的合适的低维的端口数给基站以避免过大的导频开销。
还有一种情况是，系统使用的降维导频技术，终端可以根据少量的低维导频资源来估计出高维的信道信息，终端可以推荐合适的导频端口数目给基站以取得开销与性能的折衷。
对于这种情况一般终端还需要给出推荐的端口ID反馈给基站，例如表16：
表16、导频时端口ID配置
Figure PCTCN2015076311-appb-000006
本例推荐导频参数可以在在上行数据信道上进行反馈，适用于周期及非周期测量导频，本例适用于上行测量导频及下行测量导频，适用于预编码测量导频及非预编码测量导频
示例10：
非周期导频和周期导频的属性信息是导频参数中的一个重要属性，影响到了导频的开销和信道测量性能、信令开销从而影响整个系统性能，基站与终端约定以下如表17所示候选导频属性的配置。
表17、导频属性配置
  配置1 配置2
导频属性 周期导频 非周期导频
一般来说，周期导频不需要物理层控制信令，持续时间长，不需要物理层控制信令资源，测量时可以利用周期导频的时域相关性来压制噪声干扰提升性能。但是其最大的问题是导频开销大，浪费较多。
非周期导频不需要物理层控制信令，实时性好，导频资源利用率高，但 是控制信令的开销很大。需要较多信令用于非周期导频参数配置与触发。
终端可以考虑在上行信道上向基站推荐更适合的导频属性给基站。
示例11：
预编码导频和非预编码导频的属性信息是导频参数中的一个重要属性，影响到了导频的开销和信道测量性能、信令开销从而影响整个系统性能，基站与终端约定以下如表18所示候选导频属性的配置。
表18、导频属性配置
  配置1 配置2
导频属性 预编码导频 非预编码导频
一般来说，预编码导频对于能够覆盖到的终端来说性能较好，导频资源利用率高，但容易出现终端覆盖空洞问题，如果不处于波束导频覅该范围内，则可能出现无法测量的情况。非预编码导频的性能较差，资源利用率不高，但一般覆盖面比较广
终端可以根据信道是否与预编码导频匹配来推荐是使用预编码导频还是非预编码导频。
如果终端不处于预编码导频的覆盖范围内，且又期望使用预编码导频的话，应该像基站推荐能够覆盖该终端的一个或多个预编码导频权值给基站。
实施例二
本实施例描述一种导频信息的反馈装置，设置于终端，如图8所示，包括参数确定模块201和反馈模块202，其中：
参数确定模块201，设置为确定上行测量导频和/或下行测量导频的导频参数；
反馈模块202，设置为反馈所确定的导频参数给基站。
本实施例中，所述导频参数可以包括以下一种或多种：
上行测量导频和/或下行测量导频的发送周期或子帧偏置；
上行测量导频和/或下行测量导频的发送密度；
上行测量导频和/或下行测量导频的发送功率；
上行测量导频和/或下行测量导频发送的位置；
上行测量导频和/或下行测量导频发送的端口数；
上行测量导频和/或下行测量导频发送的端口标识选择信息；
上行测量导频和/或下行测量导频端口对应的预编码信息；
上行测量导频和/或下行测量导频周期或非周期导频属性配置；
上行测量导频或下行测量导频预编码或非预编码导频属性配置。
本实施例的一种实施方式中，所述上行测量导频和/或下行测量导频的发送密度包括：
上行测量导频和/或下行测量导频发送资源块RB密度或带宽；或者
RB内的上行测量导频和/或下行测量导频发送密度。
本实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频的发送密度时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块201根据当前的频率选择性衰落情况或相关带宽选择物理资源块对PRB pair的密度或PRB pair内RE的密度。
本实施例的一种实施方式中，所述上行测量导频和/或下行测量导频发送的位置包括以下任一种：
上行测量导频和/或下行测量导频发送RB位置；
RB内的上行测量导频和/或下行测量导频发送位置；
上行测量导频和/或下行测量导频发送的时域位置。
本实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频发送的时域位置时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块201根据信道的时变快慢和/或自身的计算能力确定非周期导频的发送子帧位置。
本实施例的一种实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频的子帧偏置和/或发送的位置时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块201根据信道干扰情况，在可选的上行测量导频和/或下行测量导频的导频参数中，确定干扰较小的导频参数。
本实施例的一种实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频的发送周期时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块201根据当前移动速度或信噪比确定所述上行测量导频和/或下行测量导频的发送周期。
本实施例的一种实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频的发送功率时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块根据信道条件确定上行测量导频和/或下行测量导频的导频参数。
本实施例的一种实施方式中，当所述导频参数包括上行测量导频和/或下行测量导频发送的端口数时，所述参数确定模块201确定上行测量导频和/或下行测量导频的导频参数是指：
所述参数确定模块201根据导频开销与性能的折衷确定上行测量导频和/或下行测量导频发送的端口数。
实施例三
本实施例提供一种终端，包括实施例二所述的装置。参见实施例二中描述，此处不再赘述
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现，相应地，上述实施例中的各模块/单元可以采用 硬件的形式实现，也可以采用软件功能模块的形式实现。
工业实用性
通过本发明实施例方案，基站能够配置更加适合的CSI-RS或SRS用于信道信息的测量，可以提高系统的性能和资源利用效率。

Claims (22)

  1. 一种导频信息的反馈方法，包括：
    终端确定上行测量导频和/或下行测量导频的导频参数；
    终端反馈所确定的导频参数给基站。
  2. 如权利要求1所述的方法，其中，所述导频参数包括以下一种或多种：
    上行测量导频和/或下行测量导频的发送周期或子帧偏置；
    上行测量导频和/或下行测量导频的发送密度；
    上行测量导频和/或下行测量导频的发送功率；
    上行测量导频和/或下行测量导频发送的位置；
    上行测量导频和/或下行测量导频发送的端口数；
    上行测量导频和/或下行测量导频发送的端口标识选择信息；
    上行测量导频和/或下行测量导频端口对应的预编码信息；
    上行测量导频和/或下行测量导频周期或非周期导频属性配置；
    上行测量导频或下行测量导频预编码或非预编码导频属性配置。
  3. 如权利要求2所述的方法，其中，所述上行测量导频和/或下行测量导频的发送密度包括：
    上行测量导频和/或下行测量导频发送资源块RB密度或带宽；或者，
    RB内的上行测量导频和/或下行测量导频发送密度。
  4. 如权利要求2所述的方法，其中，所述上行测量导频和/或下行测量导频发送的位置包括以下任一种：
    上行测量导频和/或下行测量导频发送RB位置；
    RB内的上行测量导频和/或下行测量导频发送位置；
    上行测量导频和/或下行测量导频发送的时域位置。
  5. 如权利要求2所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的子帧偏置和/或 发送的位置时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据信道干扰情况，在可选的上行测量导频和/或下行测量导频的导频参数中，确定干扰较小的导频参数。
  6. 如权利要求2所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送周期时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据当前移动速度或信噪比确定所述上行测量导频和/或下行测量导频的发送周期。
  7. 如权利要求2所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送功率时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据信道条件确定上行测量导频和/或下行测量导频的导频参数。
  8. 如权利要求3所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送密度时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据当前的频率选择性衰落情况或相关带宽选择物理资源块对PRB pair的密度或PRB pair内RE的密度。
  9. 如权利要求4所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频发送的时域位置时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据信道的时变快慢和/或自身的计算能力确定非周期导频的发送子帧位置。
  10. 如权利要求2所述的方法，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频发送的端口数时，终端确定上行测量导频和/或下行测量导频的导频参数的步骤包括：
    终端根据导频开销与性能的折衷确定上行测量导频和/或下行测量导频 发送的端口数。
  11. 一种导频信息的反馈装置，设置于终端，包括：
    参数确定模块，设置为确定上行测量导频和/或下行测量导频的导频参数；以及
    反馈模块，设置为反馈所确定的导频参数给基站。
  12. 如权利要求11所述的装置，其中，所述导频参数包括以下一种或多种：
    上行测量导频和/或下行测量导频的发送周期或子帧偏置；
    上行测量导频和/或下行测量导频的发送密度；
    上行测量导频和/或下行测量导频的发送功率；
    上行测量导频和/或下行测量导频发送的位置；
    上行测量导频和/或下行测量导频发送的端口数；
    上行测量导频和/或下行测量导频发送的端口标识选择信息；
    上行测量导频和/或下行测量导频端口对应的预编码信息；
    上行测量导频和/或下行测量导频周期或非周期导频属性配置；
    上行测量导频或下行测量导频预编码或非预编码导频属性配置。
  13. 如权利要求12所述的装置，其中，所述上行测量导频和/或下行测量导频的发送密度包括：
    上行测量导频和/或下行测量导频发送资源块RB密度或带宽；或者，
    RB内的上行测量导频和/或下行测量导频发送密度。
  14. 如权利要求12所述的装置，其中，所述上行测量导频和/或下行测量导频发送的位置包括以下任一种：
    上行测量导频和/或下行测量导频发送RB位置；
    RB内的上行测量导频和/或下行测量导频发送位置；
    上行测量导频和/或下行测量导频发送的时域位置。
  15. 如权利要求12所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的子帧偏置和/或发送的位置时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据信道干扰情况，在可选的上行测量导频和/或下行测量导频的导频参数中，确定干扰较小的导频参数。
  16. 如权利要求12所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送周期时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据当前移动速度或信噪比确定所述上行测量导频和/或下行测量导频的发送周期。
  17. 如权利要求12所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送功率时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据信道条件确定上行测量导频和/或下行测量导频的导频参数。
  18. 如权利要求13所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频的发送密度时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据当前的频率选择性衰落情况或相关带宽选择物理资源块对PRB pair的密度或PRB pair内RE的密度。
  19. 如权利要求14所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频发送的时域位置时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据信道的时变快慢和/或自身的计算能力确定非周期导频的发送子帧位置。
  20. 如权利要求12所述的装置，其中：
    当所述导频参数包括上行测量导频和/或下行测量导频发送的端口数时，所述参数确定模块确定上行测量导频和/或下行测量导频的导频参数是指：
    所述参数确定模块根据导频开销与性能的折衷确定上行测量导频和/或下行测量导频发送的端口数。
  21. 一种终端，包括如权利要求11～20任一项所述的装置。
  22. 一种计算机可读存储介质，存储有程序指令，当该程序指令被执行时可实现权利要求1-10任一项所述的方法。
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