CN107852615A - The sending method and device of downstream signal, the method for reseptance and device of downstream signal - Google Patents

The sending method and device of downstream signal, the method for reseptance and device of downstream signal Download PDF

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Publication number
CN107852615A
CN107852615A CN201580081896.3A CN201580081896A CN107852615A CN 107852615 A CN107852615 A CN 107852615A CN 201580081896 A CN201580081896 A CN 201580081896A CN 107852615 A CN107852615 A CN 107852615A
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China
Prior art keywords
downlink
frequency band
access network
signal
uplink pilot
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CN201580081896.3A
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Chinese (zh)
Inventor
彭晶波
张劲林
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of CN107852615A publication Critical patent/CN107852615A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • 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

Abstract

The embodiment of the present invention provides the sending method and device, the method for reseptance and device of downstream signal of downstream signal.The sending method of the downstream signal includes：The uplink pilot signal that access network equipment receiving terminal is sent at least one subcarrier of band downlink；The access network equipment obtains the status information of the down channel of the band downlink according to the uplink pilot signal and channel reciprocity；The access network equipment determines the sending strategy of the downstream signal on the band downlink according to the status information of the down channel；The access network equipment sends the downstream signal on the band downlink according to the sending strategy of the downstream signal to the terminal.The status information of the down channel of band downlink can be accurately obtained using fewer signal expense using the technical scheme of the embodiment of the present invention, so as to send downstream signal to terminal using the sending strategy of accurate downstream signal.

Description

Downlink signal sending method and device and downlink signal receiving method and device Technical Field
The present invention relates to communication technologies, and in particular, to a method and an apparatus for transmitting a downlink signal, and a method and an apparatus for receiving a downlink signal.
Background
Frequency Division Duplex (FDD) technology is one of Duplex communication technologies used in mobile communication systems. In the FDD system, a base station transmits a downlink signal to a terminal using a downlink frequency band, and receives an uplink signal transmitted by the terminal using an uplink frequency band. In order to obtain The channel state information of The downlink frequency band, a terminal feedback mechanism is defined in The 3rd Generation Partnership Project (3 GPP). The terminal obtains the state information of the instantaneous channel of the downlink frequency band by measuring the instantaneous channel of the downlink frequency band, and then feeds back the state information to the base station after quantizing the state information.
The applicant finds that the following problems exist in the terminal feedback mechanism: because the terminal feeds back quantized channel state information of the downlink frequency band, if the feedback precision needs to be improved, the feedback signal occupies more uplink resources, thereby influencing the transmission of the uplink signal; if the uplink resource occupied by the feedback signal is reduced, the feedback precision is reduced, thereby influencing the sending of the downlink signal.
Disclosure of Invention
The embodiment of the invention provides a downlink signal sending method and device and a downlink signal receiving method and device, which are used for solving the contradiction problem between the improvement of feedback precision and the reduction of uplink resources occupied by feedback signals.
A first aspect provides a method for transmitting a downlink signal, including: the access network equipment receives an uplink pilot signal sent by a terminal on at least one subcarrier of a downlink frequency band; the access network equipment acquires the state information of the downlink channel on the downlink frequency band according to the uplink pilot signal and the channel reciprocity; the access network equipment determines a sending strategy of the downlink signal on the downlink frequency band according to the state information of the downlink channel; and the access network equipment sends the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
A second aspect provides a method for receiving a downlink signal, including: a terminal sends an uplink pilot signal to access network equipment on at least one subcarrier of a downlink frequency band, wherein the uplink pilot signal is used for the access network equipment to obtain a sending strategy of a downlink signal on the downlink frequency band; and the terminal receives the downlink signal sent by the access network equipment on the downlink frequency band according to the sending strategy of the downlink signal.
A third aspect provides a downlink signal transmitting apparatus, including: a receiving unit, configured to receive an uplink pilot signal sent by a terminal on at least one subcarrier of a downlink frequency band; a processing unit, configured to obtain state information of a downlink channel of the downlink frequency band according to the uplink pilot signal and channel reciprocity, and determine a sending policy of a downlink signal on the downlink frequency band according to the state information of the downlink channel; and the sending unit is used for sending the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
A fourth aspect provides a downlink signal receiving apparatus, including: a sending unit, configured to send an uplink pilot signal to an access network device on at least one subcarrier of a downlink frequency band, where the uplink pilot signal is used by the access network device to obtain a sending policy of a downlink signal on the downlink frequency band; a receiving unit, configured to receive the downlink signal sent by the access network device on the downlink frequency band according to the sending policy of the downlink signal.
In the embodiment of the invention, the access network equipment receives an uplink pilot signal sent by the terminal on at least one subcarrier of a downlink frequency band, determines a sending strategy of the downlink signal according to the uplink pilot signal and channel reciprocity, and sends the downlink signal to the terminal on the downlink frequency band. The access network equipment does not need the terminal to feed back quantized channel state information of the downlink frequency band, so that the problem that more uplink resources are occupied by feedback signals is avoided. Compared with a mode of acquiring the channel state information of the downlink frequency band by adopting the statistical characteristics of the channel, the method and the device for acquiring the channel state information of the downlink frequency band have the advantage that the acquired channel state information of the downlink frequency band is more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below. The drawings in the following description are examples of the present invention, and it will be obvious to those skilled in the art that other drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a flowchart of a method for transmitting and receiving a downlink signal according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of transmitting an uplink pilot signal on a downlink frequency band according to a second embodiment of the present invention;
fig. 3a to fig. 3c are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal is transmitted on a subcarrier of a downlink frequency band according to a third embodiment of the present invention;
fig. 4a to fig. 4c are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal is transmitted on a subcarrier of a downlink frequency band according to a fourth embodiment of the present invention;
fig. 5a to 5j are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal according to a fifth embodiment of the present invention is transmitted on more than two subcarriers of a downlink frequency band;
fig. 6 is a schematic diagram of a downlink signal transmitting method according to a sixth embodiment of the present invention;
fig. 7 is a schematic diagram of a communication system according to a seventh embodiment of the present invention;
fig. 8 is a schematic diagram of a communication system according to an eighth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The communication system related in The embodiment of The present invention may be a Second Generation (2G) mobile communication system, for example: global System for Mobile Communications (GSM), or Third Generation (3G) Mobile communication systems, such as: universal Mobile Telecommunications System (UMTS) or Fourth Generation (4G) Mobile communication systems, such as: a Long Term Evolution (Long Term Evolution, LTE for short) system. Optionally, The communication system related in The embodiment of The present invention may also be a new-Generation mobile communication system, for example, a Fifth-Generation (5G) mobile communication system.
The terminal involved in the embodiments of the present invention may be a wireless terminal, which may be a device providing voice or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) or a computer having a mobile terminal such as a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (e.g., a Radio Access Network, RAN). For example, the Wireless terminal may be a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or the like. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point, abbreviated as AP), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Device (User Device), or a User Equipment (User Equipment, abbreviated as UE).
In this embodiment of the present invention, the Network side device may include an access Network device, for example, a Base Station Controller (BSC) in a GSM system or a CDMA system, a Radio Network Controller (RNC) in a WCDMA system, a Base Station device or a centralized server in various communication systems, or a combination of the Base Station device and the Controller. It should be noted that, in the GSM system, the Base Station device may be a Base Transceiver Station (BTS); in a UMTS system, the base station device may be a NodeB; in an LTE system, the base station device may be an evolved base station (eNodeB). It should be understood that the network-side device in the embodiment of the present invention includes both an access network device in an existing communication system and an access network device in a communication system that may appear in the future, and the embodiment of the present invention is not limited.
In the embodiment of the present invention, the uplink signal refers to a signal sent by a terminal to a network side device (e.g., an access network device), and the downlink signal refers to a signal sent by the network side device (e.g., the access network device) to the terminal. In the embodiment of the present invention, a network side device is taken as an access network device for illustration.
Fig. 1 is a flowchart of a method for transmitting and receiving a downlink signal according to a first embodiment of the present invention. As shown in fig. 1, the method of the present embodiment includes:
101. the terminal sends an uplink pilot signal to the access network equipment on at least one subcarrier of the downlink frequency band, and the uplink pilot signal is used for the access network equipment to obtain a sending strategy of the downlink signal on the downlink frequency band.
The subcarrier referred to in the embodiments of the present invention refers to a radio wave having a certain frequency. Optionally, the subcarrier may be a subcarrier in an LTE system, but is not limited to the subcarrier in the LTE system; the subcarriers may also be the carriers of the transmitted signals in the GSM system or the UMTS system. Optionally, in the LTE system, the downlink frequency band includes multiple subcarriers, that is, the downlink frequency band corresponds to multiple subcarriers; in a GSM system or a UMTS system, a downlink frequency band includes one carrier, i.e., the downlink frequency band corresponds to one carrier.
Optionally, in the GSM system, the uplink pilot signal may be an uplink training sequence (uplink training sequence); in the UMTS system, the uplink pilot signal may be a pilot (pilot); in the LTE system, the uplink pilot Signal may be a Sounding Reference Signal (SRS).
Optionally, when at least one subcarrier is a subcarrier, the terminal sends the uplink pilot signal to the access network device on one subcarrier of the downlink frequency band.
Optionally, the terminal sends a pilot sequence of the uplink pilot signal to the access network device within n time units of one subcarrier, where n is a positive integer. Optionally, a part of the pilot sequence of the uplink pilot signal is sent in each of the n time units, and the pilot sequence sent in the n time units constitutes the uplink pilot signal sent on the subcarrier.
Optionally, the terminal sends a pilot sequence of the uplink pilot signal to the access network device within n consecutive time units; or, the terminal sends the pilot sequence of the uplink pilot signal to the access network device in n discontinuous time units.
Optionally, the time unit is a time slot or a symbol time. For example, in a GSM system or a UMTS system, a time unit is a time slot; in the LTE system, a time unit is a symbol time, which refers to a time length of one symbol lasting in a time domain. Optionally, in the LTE system, a frequency domain corresponds to one subcarrier, and a time-frequency Resource (time-frequency Resource) corresponding to one symbol time in a time domain is a Resource Element (RE for short). Optionally, in the LTE system, the terminal sends the pilot sequence of the uplink pilot signal to the access network device within n time units of one subcarrier, that is, the terminal sends the pilot sequence of the uplink pilot signal to the access network device on n REs in one subcarrier.
Optionally, when at least one subcarrier includes more than two subcarriers, the terminal sends the pilot sequence of the uplink pilot signal to the access network device on at least two subcarriers of the downlink frequency band. Optionally, the pilot sequences sent on different subcarriers of the more than two subcarriers constitute uplink pilot signals sent on the more than two subcarriers. Optionally, different subcarriers of the more than two subcarriers may be continuous or discontinuous in the frequency domain. When different subcarriers of more than two subcarriers are continuous in the frequency domain, different subcarriers can have a certain guard interval in the frequency domain, thereby being beneficial to reducing mutual interference between pilot sequences of uplink pilot signals on different subcarriers. Optionally, the pilot sequences sent on different subcarriers of more than two subcarriers may be completely the same, may also be partially the same, and may also be completely different. Optionally, the number of time units for sending pilot sequences on different subcarriers of the more than two subcarriers may be completely the same, may also be partially the same, and may also be completely different. Optionally, the time unit for sending the pilot sequence on different subcarriers of the more than two subcarriers may be a time unit with the same time domain, that is, the terminal sends the pilot sequence of the uplink pilot signal to the access network device simultaneously on different subcarriers of the more than two subcarriers of the downlink frequency band; or, the time unit for sending the pilot sequence on different subcarriers of the more than two subcarriers may also be a time unit with an incompletely identical time domain, that is, the terminal sends the pilot sequence of the uplink pilot signal to the access network device on different subcarriers of the more than two subcarriers of the downlink frequency band non-simultaneously.
Optionally, the terminal filters the uplink pilot signal; and the terminal sends the filtered uplink pilot signal to the access network equipment on at least one subcarrier of the downlink frequency band. For example, a Finite Impulse Response (FIR) digital filter or an Infinite Impulse Response (IIR) digital filter may be used to filter the uplink pilot signal, so as to suppress interference of the uplink pilot signal on the downlink signal to be received by the terminal after the transmission time period in the uplink pilot signal transmission time period.
102. The access network equipment receives an uplink pilot signal sent by a terminal on at least one subcarrier of a downlink frequency band.
In this step, the details similar to those in step 101 may refer to the detailed description in step 101, and are not repeated herein.
Optionally, the access network device receives an uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band.
Optionally, when at least one subcarrier is a subcarrier, the access network device receives an uplink pilot signal sent by the terminal on a subcarrier of the downlink frequency band.
Optionally, the access network device receives a pilot sequence of an uplink pilot signal sent by the terminal in n time units of one subcarrier.
Optionally, the access network device receives a pilot sequence of an uplink pilot signal sent by the terminal in consecutive n time units; or, the access network equipment receives the pilot sequence of the uplink pilot signal sent by the terminal in the intermittent n time units.
Optionally, in the LTE system, the access network device receives a pilot sequence of an uplink pilot signal sent by the terminal on n REs in one subcarrier.
Optionally, when at least one subcarrier includes more than two subcarriers, the access network device receives a pilot sequence of an uplink pilot signal sent by the terminal on the more than two subcarriers of the downlink frequency band. Optionally, the time unit for sending the pilot sequence on different subcarriers of the more than two subcarriers may be a time unit with the same time domain, that is, the access network device receives the pilot sequence of the uplink pilot signal sent by the terminal on the more than two subcarriers of the downlink frequency band at the same time; or, the time unit for sending the pilot sequence on different subcarriers of the more than two subcarriers may also be a time unit with an incompletely identical time domain, that is, the access network device receives the pilot sequence of the uplink pilot signal that is sent by the terminal on the more than two subcarriers of the downlink frequency band non-simultaneously.
103. And the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity.
The channel reciprocity referred to in the embodiments of the present invention means that when an uplink signal and a downlink signal are transmitted using the same frequency band, it can be considered that the fading of the uplink instantaneous channel and the fading of the downlink instantaneous channel are substantially the same, that is, the uplink instantaneous channel and the downlink instantaneous channel have channel reciprocity. In this embodiment and the subsequent embodiments, the uplink instantaneous channel of the downlink frequency band may also be referred to as an uplink channel, and the downlink instantaneous channel of the downlink frequency band may also be referred to as a downlink channel.
Optionally, the status information of the downlink Channel includes at least one of a Channel Quality Indicator (CQI), a Channel coefficient, and a Channel rank (rank). Here, the rank of the channel may also be referred to as a degree of freedom of the channel. Optionally, the channel coefficients include quantized channel coefficients or non-quantized channel coefficients.
Optionally, when at least one subcarrier is a subcarrier, the access network device obtains the state information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal in n time units of the subcarrier.
Optionally, the access network device obtains the state information of the downlink channel of the downlink frequency band according to a pilot sequence and channel reciprocity of an uplink pilot signal sent by the terminal on a part of subcarriers of more than two subcarriers. For example, the access network device may obtain the state information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal on one of the more than two subcarriers; the access network device may also obtain the state information of the downlink channel in the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal on multiple subcarriers (for example, two subcarriers, or three or more subcarriers) in the two or more subcarriers. Optionally, the access network device obtains the state information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal on all subcarriers of the more than two subcarriers.
Optionally, the access network device obtains state information of an uplink channel of a downlink frequency band according to the uplink pilot signal; and the access network equipment acquires the state information of the downlink channel according to the state information of the uplink channel and the channel reciprocity. For example, the access network device uses the state information of the uplink channel as the state information of the downlink channel according to the channel reciprocity; or after the access network device processes the state information of the uplink channel, according to the channel reciprocity, the processed state information of the uplink channel is used as the state information of the downlink channel. Optionally, the processing performed by the access network device on the state information of the uplink channel may be smoothing filtering processing or weighting processing, and this embodiment does not limit a specific implementation manner in which the access network device processes the state information of the uplink channel.
Optionally, the access network device performs interference cancellation on the uplink pilot signal; and the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal after the interference elimination and the channel reciprocity. For example, Interference Cancellation (IC) may be used to perform Interference Cancellation on the uplink pilot signal, so that Interference caused by a signal sent by the access network device to receive the uplink pilot signal before the access network device receives the uplink pilot signal may be eliminated. Interference cancellation may also be referred to as interference cancellation.
104. And the access network equipment determines a sending strategy of the downlink signal on the downlink frequency band according to the state information of the downlink channel.
Optionally, the downlink signal transmission strategy includes at least one of a transmission weight of the downlink signal, a transmission mode of the downlink signal, and resource allocation of the downlink signal.
Optionally, the sending weight of the downlink signal includes a single-user sending weight or a multi-user sending weight. Optionally, when the downlink is transmitted through multiple antennas, the access network device may weight different terminals in the antenna dimension by determining the transmission weight of the downlink signal, so as to suppress interference between the terminals at the transmitting end. At each sending time, the weighted optimal weight value may be determined according to the state information of the downlink channel between the access network device and the terminal. Optionally, the transmission mode of the downlink signal includes a transmit diversity transmission mode or a beamforming transmission mode. Optionally, the resource allocation of the downlink signal is determined according to at least one of a signal size, an interference size, a historical rate, and a user priority. Optionally, the signal size or the interference size may be determined according to the status information of the downlink channel.
Optionally, the access network device may also directly obtain a sending policy of the downlink signal on the downlink frequency band according to the uplink pilot signal and the channel reciprocity.
105. And the access network equipment sends the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
Optionally, the access network device filters the downlink signal; and the access network equipment sends the filtered downlink signal to the terminal on a downlink frequency band according to the sending strategy of the downlink signal. For example, an FIR digital filter or an IIR digital filter may be used to filter the downlink signal, so that interference of the downlink signal with the uplink pilot signal during the uplink pilot signal reception period may be suppressed.
Optionally, the downlink signal includes at least one of downlink signaling, downlink data, and downlink reference signal. The downlink reference signal may be used to assist in acquiring state information of a downlink channel of a downlink frequency band.
Optionally, the access network device receives an uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band in the first time period; the access network equipment acquires the state information of a downlink channel of a downlink frequency band in a first time period according to an uplink pilot signal and channel reciprocity sent by a terminal in the first time period; the access network equipment acquires the state information of the downlink channel of the downlink frequency band in a second time period according to the state information of the downlink channel of the downlink frequency band in the first time period, wherein the second time period is later than the first time period; the access network equipment determines a sending strategy of the downlink signal according to the state information of the downlink channel of the downlink frequency band in the second time period; and the access network equipment sends the downlink signal to the terminal on the downlink frequency band in a second time period according to the sending strategy of the downlink signal.
Optionally, a certain guard interval may be provided between the uplink pilot signal and the downlink signal in the time domain, so as to be beneficial to reducing mutual interference between the uplink pilot signal and the downlink signal.
106. And the terminal receives the downlink signal sent by the access network equipment on the downlink frequency band according to the sending strategy of the downlink signal.
In this step, the details in step 105 may be referred to for the similar contents in step 105, and are not repeated herein.
Optionally, the terminal sends an uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band in the first time period, where the uplink pilot signal is used for the access network device to obtain a sending strategy of the downlink signal on the downlink frequency band; and the terminal receives the downlink signal sent by the access network equipment on the downlink frequency band according to the downlink signal sending strategy in the second time period.
Optionally, in this embodiment and subsequent embodiments, the pilot sequence of the uplink pilot signal includes an orthogonal sequence or a pseudo-orthogonal sequence. Optionally, the Orthogonal sequence includes at least one of an Orthogonal Variable Spreading Factor (OVSF) sequence and a Zadoff-Chu (Zadoff-Chu, ZC) sequence. Optionally, the pseudo-orthogonal sequence comprises at least one of a maximal length linear shift register sequence m-sequence, a Golden sequence, and a Walsh sequence.
In this embodiment, the access network device receives an uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band, determines a sending strategy of the downlink signal according to the uplink pilot signal and channel reciprocity, and sends the downlink signal to the terminal on the downlink frequency band. The access network device in this embodiment does not need the terminal to feed back quantized channel state information of the downlink frequency band, thereby avoiding the problem that more uplink resources are occupied by feedback signals. Compared with a mode of acquiring the channel state information of the downlink frequency band by adopting the statistical characteristics of the channel, the method of the embodiment acquires the channel state information of the downlink frequency band more accurately.
Further, the terminal may send the uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band, and may even send the pilot sequence of the uplink pilot signal to the access network device within n time units of one subcarrier of the downlink frequency band. Therefore, the method of this embodiment can send a small number of pilot sequences of uplink pilot signals to the access network device through the terminal on the downlink frequency band, thereby reducing the overhead generated by the access network device due to sending a large number of reference signals to the terminal and occupying less downlink resources.
In the following, a GSM system or a UMTS system is taken as an application scenario for example. As described above, in the embodiments applied to the GSM system or the UMTS system, the subcarrier refers to a carrier for transmitting a signal in the GSM system or the UMTS system. In these embodiments, the downlink frequency band includes only one carrier, i.e., the downlink frequency band corresponds to one carrier.
Fig. 2 is a schematic diagram of transmitting an uplink pilot signal on a downlink frequency band according to a second embodiment of the present invention. In this embodiment, the same or similar contents as or to the first embodiment may refer to the detailed description in the first embodiment, and are not repeated herein.
In this embodiment, in an uplink frequency band, a base station receives an uplink signal sent by a terminal; on the downlink frequency band, the base station receives an uplink pilot signal sent by the terminal and sends a downlink signal to the terminal. E.g. at t1～t2And t3～t4At the moment, the terminal sends an uplink pilot signal to the access network equipment on a downlink frequency band, and correspondingly, the access network equipment is at t1～t2And t3～t4Receiving an uplink pilot signal sent by a terminal on a downlink frequency band at any moment; at t2～t3And t4～t5At the moment, the access network equipment sends a downlink signal to the terminal on a downlink frequency band, and correspondingly, the terminal sends a downlink signal to the terminal at t2～t3And t4～t5And receiving a downlink signal sent by the access network equipment on a downlink frequency band at any moment. Optionally, the access network device is at t according to the terminal1～t2Uplink pilot signal and channel reciprocity sent at moment acquire downlink frequency band at t1～t2Shape of downlink channel at timeAnd (4) state information. Optionally, the access network device is at t according to the downlink frequency band1～t2Acquiring state information of downlink channel at moment to obtain downlink frequency band at t2～t3Status information of the downlink channel at the time. Optionally, the access network device is at t according to the downlink frequency band2～t3The state information of the downlink channel at the moment determines that the downlink signal is at t2～t3A transmission policy at a time. Optionally, the terminal is at t1～t2Sending uplink pilot signal to access network equipment on downlink frequency band at moment, and sending uplink pilot signal to terminal at t2～t3And receiving the downlink signal sent by the access network equipment on the downlink frequency band according to the downlink signal sending strategy at any moment.
Note that the notation of the uplink pilot signal in fig. 2 does not necessarily mean that all signals transmitted in the time slot are uplink pilot signals. Optionally, at t1～t2At time or at t3～t4In the time interval, all the transmitted signals may be uplink pilot signals, or part of the transmitted signals may be uplink pilot signals, and the other part of the transmitted signals is downlink signals, which is described in the third embodiment and will not be described herein again.
On the basis of the second embodiment, fig. 3a to fig. 3c are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal according to a third embodiment of the present invention is transmitted on a subcarrier of a downlink frequency band. In fig. 3a to 3c, the uplink frequency band is not shown. In this embodiment, the same or similar contents to those in the first and second embodiments may refer to the detailed description in the first and second embodiments, and are not repeated herein.
In the present embodiment, the time period (e.g. t) for transmitting the uplink pilot signal is used3～t4Time period) includes 15 time units, of which 5 time units are used for transmitting pilot sequences as an example. Optionally, in this embodiment, the time unit is a time slot. Optionally, in the UMTS system, the 15 time units are 15 slots, and the 15 slots constitute one frame. The 5 time units may be any 5 time units of the 15 time units. For example, as shown in FIG. 3a, the 5 time units are 5 consecutive time unitsA time unit; as shown in fig. 3b, the 5 time units are partially consecutive 5 time units; as shown in fig. 3c, the 5 time units are completely discontinuous 5 time units.
In the following, an LTE system is taken as an application scenario for example. As described above, in the embodiments applied to the LTE system, the downlink frequency band includes a plurality of subcarriers, that is, the downlink frequency band corresponds to a plurality of subcarriers in the LTE system.
When the terminal transmits the uplink pilot signal on one of the plurality of subcarriers of the downlink frequency band, the method of transmitting the uplink pilot signal on the downlink frequency band is similar to that in the second or third embodiment. This is illustrated in connection with fig. 4a to 4 c. Fig. 4a to fig. 4c are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal is transmitted on a subcarrier of a downlink frequency band according to a fourth embodiment of the present invention. In fig. 4a to 4c, the uplink frequency band is not shown. In this embodiment, the same or similar contents as those in the first to third embodiments may refer to the detailed description in the first to third embodiments, and are not repeated herein.
Optionally, in this embodiment, fig. 4a to 4c show a time period (e.g., t) for transmitting the uplink pilot signal3～t4Time period). In this embodiment, the following downlink frequency segment includes 12 subcarriers, and the time segment for transmitting the uplink pilot signal includes 14 time units, wherein 5 time units are used for transmitting the pilot sequence as an example. In this embodiment, one subcarrier for transmitting the uplink pilot signal may be any one subcarrier of the 12 subcarriers. The 5 time units may be any 5 time units of the 14 time units. For example, as shown in fig. 4a, the 5 time units are consecutive 5 time units; as shown in fig. 4b, the 5 time units are partially consecutive 5 time units; as shown in fig. 4c, the 5 time units are completely discontinuous 5 time units.
Optionally, the time unit is a symbol time. In the LTE system, a subcarrier corresponds to a frequency domain, and a time-frequency resource corresponding to a symbol time in a time domain is an RE. Fig. 4a to 4c show two Resource Blocks (RBs) in an LTE system, where one RB corresponds to 12 subcarriers in the frequency domain and 7 symbol times in the time domain. In the LTE system, two RBs constitute one resource block Pair (RB Pair).
Fig. 5a to 5j are schematic diagrams illustrating that a pilot sequence of an uplink pilot signal according to a fifth embodiment of the present invention is transmitted on more than two subcarriers of a downlink frequency band. In fig. 5a to 5j, the uplink frequency band is not shown. In this embodiment, the same or similar contents as those in the first to fourth embodiments may refer to the detailed description in the first to fourth embodiments, and are not repeated herein.
FIGS. 5a to 5j show a time period (e.g., t) for transmitting an uplink pilot signal3～t4Time period). In this embodiment, the downlink frequency segment includes 12 subcarriers, wherein the number of subcarriers of the pilot sequence for transmitting the uplink pilot signal is 5. For convenience of description, the 5 subcarriers may be labeled as subcarrier a, subcarrier B, subcarrier C, subcarrier D, subcarrier E. In this embodiment, the 5 subcarriers may be any 5 subcarriers in the downlink frequency band. For example, as shown in fig. 5b, fig. 5e, and fig. 5h, the 5 subcarriers may be 5 subcarriers consecutive in the frequency domain in the downlink frequency band; as shown in fig. 5c, fig. 5f, and fig. 5i, the 5 subcarriers may also be partially continuous 5 subcarriers in the frequency domain in the downlink frequency band; as shown in fig. 5d, 5g, and 5j, the 5 subcarriers may also be 5 subcarriers that are completely discontinuous in the frequency domain in the downlink frequency band.
The number of time units for transmitting the pilot sequences on each of the 5 subcarriers may be completely the same, may also be partially the same, and may also be completely different. For example, as shown in fig. 5b to 5j, the number of time units for transmitting the pilot sequences on each of the 5 subcarriers is the same; as shown in fig. 5a, the number of time units for transmitting the pilot sequence on each of the 5 subcarriers is partially the same.
The number of time units for transmitting the pilot sequence on each of the 5 subcarriers may be one, or may be multiple (e.g., two, three, or more). For example, as shown in fig. 5a, the number of time units for transmitting the pilot sequence on the subcarrier E is one, and the number of time units for transmitting the pilot sequence on the subcarriers a to D is plural.
When the time unit for transmitting the pilot sequence on one of the 5 subcarriers is a plurality of time units, the plurality of time units may be continuous time units or discontinuous time units. For example, as shown in fig. 5a, the plurality of time units for transmitting the pilot sequence in subcarrier C are consecutive time units, and the plurality of time units for transmitting the pilot sequence in subcarriers a, B, and D are discontinuous time units. The method for transmitting pilot sequences on one subcarrier is similar to the method in the second to fourth embodiments, and is not described herein again.
The time unit for sending the pilot sequence on each subcarrier of the 5 subcarriers may be the time unit with the same time domain, or may be the time unit with different time domains. For example, as shown in fig. 5b to fig. 5d, 5 time units for sending pilot sequences on subcarriers a to E are 5 time units with the same time domain, that is, the terminal sends the pilot sequences of uplink pilot signals to the access network device on the 5 subcarriers at the same time, and correspondingly, the access network device receives the pilot sequences of uplink pilot signals sent by the terminal on the 5 subcarriers at the same time; as shown in fig. 5E to fig. 5j, 5 time units for transmitting the pilot sequences on the subcarriers a to E are 5 time units with different time domains, that is, the terminal transmits the pilot sequences of the uplink pilot signals to the access network device on the 5 subcarriers non-simultaneously, and correspondingly, the access network device receives the pilot sequences of the uplink pilot signals transmitted by the terminal on the 5 subcarriers non-simultaneously.
Fig. 6 is a schematic diagram of a method for transmitting a downlink signal according to a sixth embodiment of the present invention. The present embodiment takes a multi-antenna processing procedure in the LTE system as an example for description. In this embodiment, the access network device may be an eNodeB in an LTE system. As shown in fig. 6, after the downlink signal is subjected to channel coding (channel coding), scrambling (scrambling), modulation (modulation), and codeword to layer mapping (codeword to layer mapping), the eNodeB processes the downlink signal in a precoding (pre-coding) module according to the transmission strategy of the downlink signal determined in the foregoing embodiments, and then transmits the processed downlink signal to the terminal. Optionally, the downlink signal transmission strategy includes at least one of a transmission weight of the downlink signal, a transmission mode of the downlink signal, and resource allocation of the downlink signal. The following describes the present embodiment by taking the transmission weight of the downlink signal as an example.
And the precoding module modulates the data to be sent to different terminals to different transmitting antennas by the weighting of antenna dimensions according to the sending weight of the downlink signal. Assuming that the eNodeB has M transmit antennas, a total of N terminals are scheduled, wherein M, N are integers greater than 1. In this embodiment, an example in which each terminal has one receiving antenna is described, and the analogy can be made according to the description in this embodiment when each terminal has multiple receiving antennas. The mth antenna represents a certain transmitting antenna of the eNodeB, wherein M is more than or equal to 1 and less than or equal to M, and M is an integer. The nth terminal represents one of the N terminals, wherein N is more than or equal to 1 and less than or equal to N, and N is an integer. snAnd the downlink signal sent by the eNodeB, which the nth terminal needs to receive, is indicated. w is amnA transmission weight, w, representing that the mth antenna transmits a downlink signal to the nth terminalnRepresents the total transmission weight of downlink signals transmitted by the eNodeB to the nth terminal, wherein wn＝(w1n,w2n,...,wmn,...,wMn)。xnDenotes a downlink signal transmitted by the eNodeB to the nth terminal, and x denotes a total downlink signal transmitted by the eNodeB to the N terminals, where x ═ { x ═1,x2,...,xn,...,xN}。hiAnd the state information of a downlink channel between the eNodeB and the ith terminal is represented, wherein i is more than or equal to 1 and less than or equal to N, and i is an integer. y isiIndicating the downlink signal received by the ith terminal. Then
Downlink signals sent by the eNodeB to the nth terminal are as follows:
xn＝(w1nsn,w2nsn,...,wmnsn,...,wMnsn)＝wnsn
total downlink signals sent by the eNodeB to the N terminals:
when calculating the downlink signal received by the ith terminal, that is, n is i, the downlink signal received by the ith terminal is:
therefore, in order to make each of the N terminals receive downlink signals required by itself as much as possible, the eNodeB needs to be based on h1,h2,...,hNTo determine w1,w2,..,wNSuch that for any ith terminal, hi·wi·siThe value of (A) is as large as possible while the value is as small as possible. Optionally, the eNodeB may obtain the state information of the downlink channel according to the methods in the foregoing embodiments to determine the downlink signal transmission weight in this embodiment.
Fig. 7 is a schematic diagram of a communication system according to a seventh embodiment of the present invention. In this embodiment, the details corresponding to the first to sixth embodiments may refer to the detailed description in the first embodiment, and are not repeated herein. As shown in fig. 7, the communication system provided in this embodiment includes a downlink signal transmitting apparatus 700 and a downlink signal receiving apparatus 710, where the downlink signal transmitting apparatus 700 and the downlink signal receiving apparatus 710 communicate with each other.
In this embodiment, the sending apparatus 700 of the downlink signal may be an access network device, for example, a base station device in various communication systems. For example, in a GSM system, the base station device may be a BTS; in the UMTS system, the base station apparatus may be a NodeB; in an LTE system, the base station device may be an eNodeB. The receiving device 710 of the downlink signal may be a terminal, for example, a UE.
In this embodiment, an example will be described in which the downlink signal transmitting apparatus 700 is an access network device 700, and the downlink signal receiving apparatus 710 is a terminal 710.
As shown in fig. 7, in this embodiment, the access network device 700 includes: a receiving unit 701, a processing unit 702 and a transmitting unit 703. The terminal 710 includes: a transmitting unit 711 and a receiving unit 712. Optionally, the terminal 710 further comprises a processing unit 712.
A sending unit 711 of the terminal 710 is configured to send an uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band, where the uplink pilot signal is used by the access network device 700 to obtain a sending policy of the downlink signal.
Optionally, the sending unit 711 is specifically configured to send the uplink pilot signal to the access network device 700 on one subcarrier of the downlink frequency band.
Optionally, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in n time units of one subcarrier of the downlink frequency band.
Optionally, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in n consecutive time units or specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in n intermittent time units.
Optionally, the time unit is a time slot or a symbol time. For example, in an LTE system, the time unit is a symbol time. The transmitting unit 711 is specifically configured to transmit a pilot sequence of an uplink pilot signal to the access network device 700 on n REs in one subcarrier in the LTE system.
Optionally, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 on two or more subcarriers of the downlink frequency band. Optionally, the sending unit 711 is specifically configured to send a pilot sequence of an uplink pilot signal to the access network device 700 on more than two subcarriers in which frequency domains of a downlink frequency band are continuous; alternatively, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 on two or more subcarriers of the downlink frequency band where the frequency domain is discontinuous. Optionally, the sending unit 711 is specifically configured to send the exactly same pilot sequence to the access network device 700 on different subcarriers of the more than two subcarriers; or, the sending unit 711 is specifically configured to send partially identical pilot sequences to the access network device 700 on different subcarriers of the more than two subcarriers; alternatively, the transmitting unit 711 is specifically configured to transmit completely different pilot sequences to the access network device 700 on different subcarriers of the two or more subcarriers. Optionally, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in the time units with the same number of different subcarriers in more than two subcarriers; alternatively, the transmitting unit 711 is specifically configured to transmit the pilot sequence of the uplink pilot signal to the access network device 700 in time units with different numbers of different subcarriers of more than two subcarriers. Optionally, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in a time unit where time domains of different subcarriers of the more than two subcarriers are completely the same, that is, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 simultaneously on different subcarriers of the more than two subcarriers; or, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 in a time unit in which time domains of different subcarriers of the two or more subcarriers are not completely the same, that is, the sending unit 711 is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device 700 on different subcarriers of the two or more subcarriers non-simultaneously.
Optionally, the sending unit 711 is specifically configured to, after filtering the uplink pilot signal by the processor 713 of the terminal 710, send the filtered uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band.
Optionally, the sending unit 711 is specifically configured to send the uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band in the first time period.
A receiving unit 701 of the access network device 700 is configured to receive an uplink pilot signal after the terminal 710 sends the uplink pilot signal on at least one subcarrier of the downlink frequency band.
Optionally, the receiving unit 701 is specifically configured to receive an uplink pilot signal sent by the terminal 710 on one subcarrier of the downlink frequency band.
Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 in n time units of one subcarrier of the downlink frequency band.
Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 in consecutive n time units or specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 in intermittent n time units.
Optionally, the time unit is a time slot or a symbol time. For example, in an LTE system, the time unit is a symbol time. The receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal transmitted by the terminal 710 on n REs in one subcarrier in the LTE system.
Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 on more than two subcarriers of the downlink frequency band. Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 on more than two subcarriers in which frequency domains of a downlink frequency band are continuous; alternatively, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 on two or more subcarriers of the downlink frequency band where the frequency domain is discontinuous. Optionally, the receiving unit 701 is specifically configured to receive exactly the same pilot sequence sent by the terminal 710 on different subcarriers of the more than two subcarriers; or, the receiving unit 701 is specifically configured to receive pilot sequences that are partially the same and sent by the terminal 710 on different subcarriers of the more than two subcarriers; alternatively, the receiving unit 701 is specifically configured to receive completely different pilot sequences transmitted by the terminal 710 on different subcarriers of the two or more subcarriers. Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 in a time unit with the same number of different subcarriers in more than two subcarriers; alternatively, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal transmitted by the terminal 710 in time units with different numbers of different subcarriers of more than two subcarriers. Optionally, the receiving unit 701 is specifically configured to receive a pilot sequence of an uplink pilot signal sent by the terminal 710 in a time unit in which time domains of different subcarriers of the more than two subcarriers are completely the same, that is, the receiving unit 701 is specifically configured to receive the pilot sequence of the uplink pilot signal sent by the terminal 710 simultaneously on different subcarriers of the more than two subcarriers; alternatively, the receiving unit 701 is specifically configured to receive the pilot sequence of the uplink pilot signal sent by the terminal 710 in a time unit in which time domains of different subcarriers of the two or more subcarriers are not completely the same, that is, the receiving unit 701 is specifically configured to receive the pilot sequence of the uplink pilot signal sent by the terminal 710 non-simultaneously on different subcarriers of the two or more subcarriers.
Optionally, the receiving unit 701 is specifically configured to, after the transmitting unit 711 of the terminal 710 transmits the filtered uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band, receive the filtered uplink pilot signal.
Optionally, the receiving unit 701 is specifically configured to receive the uplink pilot signal in a first time period when the terminal 710 transmits the uplink pilot signal on at least one subcarrier of the downlink frequency band in the first time period.
A processing unit 702 of the access network device 700, configured to, after the receiving unit 701 receives an uplink pilot signal sent by the terminal 710 on at least one subcarrier of a downlink frequency band, obtain state information of a downlink channel of the downlink frequency band according to the uplink pilot signal and channel reciprocity; and a sending strategy for determining the downlink signal on the downlink frequency band according to the state information of the downlink channel.
Optionally, the processing unit 702 is specifically configured to obtain the state information of the downlink channel in the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal 710 in n time units of one subcarrier. For example, the processing unit 702 is specifically configured to obtain state information of a downlink channel in a downlink frequency band according to a pilot sequence and channel reciprocity of an uplink pilot signal sent by the terminal 710 in consecutive n time units; alternatively, the processing unit 702 is specifically configured to obtain the state information of the downlink channel in the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal 710 in the intermittent n time units of one subcarrier.
Optionally, the processing unit 702 is specifically configured to obtain the state information of the downlink channel in the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal 710 on part of subcarriers of more than two subcarriers. For example, the processing unit 702 is specifically configured to obtain, according to a pilot sequence and channel reciprocity of an uplink pilot signal sent by the terminal 710 on one subcarrier of more than two subcarriers, state information of a downlink channel of a downlink frequency band; alternatively, the processing unit 702 is specifically configured to obtain the status information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal 710 on multiple subcarriers (for example, two subcarriers, or three or more subcarriers) in more than two subcarriers. Optionally, the processing unit 702 is specifically configured to obtain the state information of the downlink channel in the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal 710 on all subcarriers of the more than two subcarriers.
Optionally, the processing unit 702 is specifically configured to obtain, according to the uplink pilot signal, state information of an uplink channel in the downlink frequency band; and is specifically configured to obtain the state information of the downlink channel according to the state information of the uplink channel and channel reciprocity. For example, the processing unit 702 is specifically configured to use the state information of the uplink channel as the state information of the downlink channel according to channel reciprocity; alternatively, the processing unit 702 is specifically configured to, after processing the state information of the uplink channel, use the processed state information of the uplink channel as the state information of the downlink channel according to channel reciprocity. Optionally, the processing unit 702 is specifically configured to perform smoothing filtering processing, weighting processing, or other processing on the state information of the uplink channel.
Optionally, the processing unit 702 is specifically configured to perform interference cancellation on the uplink pilot signal; and specifically, the method and the device are used for acquiring the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity after the interference cancellation. For example, the processing unit 702 is specifically configured to perform interference cancellation on the uplink pilot signal by using an interference cancellation method, so that before the receiving unit 701 receives the uplink pilot signal, the transmitting unit 703 transmits a downlink signal to eliminate interference on the receiving unit 701 receiving the uplink pilot signal.
Optionally, the downlink signal transmission strategy includes at least one of a transmission weight of the downlink signal, a transmission mode of the downlink signal, and resource allocation of the downlink signal.
Optionally, the processing unit 702 is specifically configured to, during downlink multi-antenna transmission, determine a sending weight of a downlink signal, and weight different terminals 710 in an antenna dimension, so as to suppress interference between different terminals 710 at a transmitting end. Optionally, the processing unit 702 is specifically configured to determine an optimal weighted value weighted at each sending time according to state information of a downlink channel between the access network device 700 and the terminal 710. Optionally, the processing unit 702 is specifically configured to determine downlink signal resource allocation according to at least one of a signal size, an interference size, a historical rate, and a user priority. Optionally, the processing unit 702 is specifically configured to determine a signal size or an interference size according to the downlink channel state information.
Optionally, the processing unit 702 is specifically configured to filter the downlink signal. For example, the processing unit 702 is specifically configured to filter the downlink signal by using an FIR digital filter or an IIR digital filter, so as to suppress interference of the downlink signal with the uplink pilot signal in the uplink pilot signal receiving period.
Optionally, the processing unit 702 is specifically configured to, after the receiving unit 701 receives an uplink pilot signal sent by the terminal 710 on at least one subcarrier of the downlink frequency band in the first time period, obtain, according to the uplink pilot signal and channel reciprocity, state information of a downlink channel of the downlink frequency band in the first time period; the downlink channel state information acquiring unit is specifically configured to acquire the state information of the downlink channel of the downlink frequency band in the second time period according to the state information of the downlink channel of the downlink frequency band in the first time period; and specifically, the downlink signal transmission strategy is determined according to the state information of the downlink channel of the downlink frequency band in the second time period.
The sending unit 703 of the access network device 700 is configured to, after the processing unit 702 determines a sending policy of the downlink signal on the downlink frequency band according to the state information of the downlink channel, send the downlink signal to the terminal 710 on the downlink frequency band according to the sending policy of the downlink signal.
Optionally, the sending unit 703 is specifically configured to send the filtered downlink signal to the terminal 710 on the downlink frequency band according to the sending strategy of the downlink signal.
Optionally, the sending unit 703 is specifically configured to, after the processor 702 determines the sending policy of the downlink signal according to the state information of the downlink channel of the downlink frequency band in the second time period, send the downlink signal to the terminal 710 in the downlink frequency band according to the sending policy of the downlink signal in the second time period.
A receiving unit 712 of the terminal 710 is configured to receive the downlink signal after the access network device 700 sends the downlink signal to the terminal 710 on the downlink frequency band according to the sending policy of the downlink signal.
Optionally, the receiving unit 712 is specifically configured to receive the filtered downlink signal after the transmitting unit 703 of the access network device 700 transmits the filtered downlink signal to the terminal 710 on the downlink frequency band according to the transmission policy of the downlink signal.
Optionally, the receiving unit 712 is specifically configured to receive the downlink signal in the second time period when the sending unit 703 of the access network device 700 sends the downlink signal to the terminal 710 on the downlink frequency band according to the sending policy of the downlink signal in the second time period.
Optionally, the processing unit 713 of the terminal 710 is configured to filter the uplink pilot signal before the transmitting unit 711 transmits the uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band. For example, the processing unit 713 is specifically configured to filter the uplink pilot signal by using an FIR digital filter or an IIR digital filter, so that interference of the uplink pilot signal with the downlink signal to be received by the receiving unit 712 after the transmission period in the uplink pilot signal transmission period can be suppressed.
Optionally, the processing unit 713 is further configured to perform interference cancellation on the downlink signal after the receiving unit 712 receives the downlink signal that is sent on the downlink frequency band by the sending unit 703 of the access network device 700 according to the downlink policy of the downlink signal.
Optionally, the communication system provided in this embodiment may be a GSM system or a UMTS system, may also be an LTE system, and may also be a 5G mobile communication system or other mobile communication systems that may appear in the future.
Alternatively, the receiving unit 701 and the receiving unit 712 may be receivers, the processing unit 702 and the processing unit 713 may be processors, and the transmitting unit 703 and the transmitting unit 711 may be transmitters.
Alternatively, the receiving unit 701 and the transmitting unit 703 may be combined into a transceiver or a transceiver circuit. The transmitting unit 711 and the receiving unit 712 may also be combined into a transceiver or a transceiving circuit.
Alternatively, the receiving unit 701 and the transmitting unit 703 may be wireless interfaces of base station devices. Optionally, the wireless interface of the base station device may further include an antenna device or the wireless interface of the base station device is connected to the antenna device of the base station device. The transmitting unit 711 and the receiving unit 712 may be wireless interfaces of terminals. Optionally, the wireless interface of the terminal may further include an antenna device or the wireless interface of the terminal is connected to the antenna device of the terminal.
Optionally, the receiving unit 701 in the access network device 700 is configured to perform a signal receiving process of the access network device 700 in the methods shown in fig. 1 to fig. 5 j; the processing unit 702 is configured to perform a signal processing procedure of the access network device 700 in the method shown in fig. 1 to 6; the sending unit 703 may be configured to perform a signal sending process of the access network device 700 in the methods shown in fig. 1 to fig. 6. The transmitting unit 711 of the terminal 710 is configured to perform a signal transmitting process of the terminal 710 in the method shown in fig. 1 to 5 j; the receiving unit 712 of the terminal 710 is configured to perform a signal receiving process of the terminal 710 in the method shown in fig. 1 to 5 j; the processing unit 713 of the terminal 710 is configured to perform the signal processing procedure of the terminal 710 in the method shown in fig. 1 to 5 j.
In this embodiment, the access network device 700 receives an uplink pilot signal sent by the terminal 710 on at least one subcarrier of the downlink frequency band, determines a sending strategy of the downlink signal according to the uplink pilot signal and channel reciprocity, and sends the downlink signal to the terminal 710 on the downlink frequency band. The access network device 700 in this embodiment does not need the terminal 710 to feed back quantized channel state information of the downlink frequency band, thereby avoiding the problem that more uplink resources are occupied by feedback signals. In this embodiment, the access network device 700 obtains the channel state information of the downlink frequency band according to the uplink pilot signal and the channel reciprocity, which is more accurate than the channel state information of the downlink frequency band obtained according to the statistical characteristic of the channel. Further, the terminal 710 may send the uplink pilot signal to the access network device 700 on at least one subcarrier of the downlink frequency band, or even send the pilot sequence of the uplink pilot signal to the access network device 700 in n time units of one subcarrier of the downlink frequency band, so that the overhead generated when the access network device 700 sends a large number of reference signals to the terminal 710 can be reduced, and less downlink resources are occupied.
Fig. 8 is a schematic diagram of a communication system according to an eighth embodiment of the present invention. In this embodiment, the details similar to those in the seventh embodiment may refer to the detailed description in the seventh embodiment, and are not repeated herein. As shown in fig. 8, the communication system provided in this embodiment includes a downlink signal transmitting apparatus 800 and a downlink signal receiving apparatus 810, where the downlink signal transmitting apparatus 800 and the downlink signal receiving apparatus 810 communicate with each other. In this embodiment, an example is given in which the downlink signal transmitting apparatus 800 is an access network device 800, and the downlink signal receiving apparatus 810 is a terminal 810.
As shown in fig. 8, in this embodiment, the access network device 800 includes: a wireless interface 801 and a processor 802.
Optionally, the wireless interface 801 includes a receiving unit 701 and a transmitting unit 703 in the seventh embodiment. The wireless interface 801 may also include an antenna device or an antenna device that the wireless interface 801 connects to an access network device.
Optionally, the processor 802 includes the processing unit 702 in the seventh embodiment.
Further, the access network device 800 may further include a memory 803. The memory 803 is used to store processor executable instructions. The instructions stored in the memory 803 may cause the processor 802 to perform the processes of signal processing in fig. 1-6 described above, such as:
the processor-executable instructions stored in the memory 803 cause the processor 802 to: acquiring an uplink pilot signal transmitted by a terminal on at least one subcarrier of a downlink frequency band; acquiring state information of a downlink signal of a downlink frequency band according to an uplink pilot signal and channel reciprocity; determining a sending strategy of a downlink signal on a downlink frequency band according to the state information of the downlink channel; and sending the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
Optionally, an embodiment of the present invention further provides a computer storage medium or a computer program product, which is used for storing the processor executable instructions.
In this embodiment, the terminal 710 includes: a wireless interface 811, and a processor 812.
Optionally, the wireless interface 811 includes a transmitting unit 711 and a receiving unit 712 in the seventh embodiment. The wireless interface 811 may also include an antenna device or an antenna device to which the wireless interface 811 is connected to a terminal.
Optionally, the processor 812 includes the processing unit 713 in the seventh embodiment.
Further, the terminal 810 may also include a memory 813. Memory 813 is used to store processor executable instructions. The instructions stored in memory 813 may cause processor 812 to perform the processes of signal processing described above in fig. 1-5 j, such as:
the processor-executable instructions stored in memory 813 cause processor 812 to: sending an uplink pilot signal to the access network equipment on at least one subcarrier of the downlink frequency band, wherein the uplink pilot signal is used for the access network equipment to obtain a sending strategy of the downlink signal on the downlink frequency band; and acquiring the downlink signal transmitted by the access network equipment on the downlink frequency band according to the transmission strategy of the downlink signal.
Optionally, an embodiment of the present invention further provides a computer storage medium or a computer program product, which is used for storing the processor executable instructions.
The receiving unit in the embodiments of the present application may directly receive a signal sent by the peer device, may also receive a signal sent by the peer device through other elements (for example, an antenna device), and may also receive a signal sent by the peer device that is processed (for example, filtered) or converted by other elements.
The sending unit in the embodiments of the present application may send a signal to the peer device directly, may send a signal to the peer device through other elements (for example, an antenna device), and may send a signal to the peer device after processing (for example, filtering) or converting the signal through other elements.
The processing unit in the embodiments of the present application may obtain the signal directly from the receiving unit, or may obtain the signal indirectly from the receiving unit through an intermediate element (e.g., a filter, a coupler). The processing unit may provide signals directly to the transmitting unit or indirectly through intermediate elements (e.g., filters, couplers).
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (34)

  1. A method for transmitting a downlink signal, comprising:
    the access network equipment receives an uplink pilot signal sent by a terminal on at least one subcarrier of a downlink frequency band;
    the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity;
    the access network equipment determines a sending strategy of the downlink signal on the downlink frequency band according to the state information of the downlink channel;
    and the access network equipment sends the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
  2. The method of claim 1, wherein the at least one subcarrier is one subcarrier,
    the method for receiving the uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band by the access network equipment comprises the following steps:
    and the access network equipment receives the uplink pilot signal sent by the terminal on the subcarrier.
  3. The method of claim 1, wherein the at least one subcarrier is one subcarrier,
    the method for receiving the uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band by the access network equipment comprises the following steps:
    the access network equipment receives a pilot sequence of the uplink pilot signal sent by the terminal in n time units of the subcarrier, wherein n is a positive integer;
    the access network device obtains the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity, and the method comprises the following steps:
    and the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the pilot frequency sequence and the channel reciprocity of the uplink pilot frequency signal.
  4. The method of claim 3, wherein the receiving, by the access network device, the pilot sequence of the uplink pilot signal sent by the terminal in n time units of the subcarrier includes:
    and the access network equipment receives the pilot frequency sequence of the uplink pilot signal sent by the terminal in continuous n time units or the access network equipment receives the pilot frequency sequence of the uplink pilot signal sent by the terminal in discontinuous n time units.
  5. The method according to claim 3 or 4, wherein the time unit is a time slot or a symbol time.
  6. The method of claim 1, wherein the at least one subcarrier comprises more than two subcarriers,
    the method for receiving the uplink pilot signal sent by the terminal on at least one subcarrier of the downlink frequency band by the access network equipment comprises the following steps:
    the access network equipment receives the pilot frequency sequence of the uplink pilot frequency signal sent by the terminal on the more than two subcarriers;
    the access network device obtains the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity, and the method comprises the following steps:
    and the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the pilot frequency sequence and the channel reciprocity of the uplink pilot frequency signal.
  7. The method of claim 6, wherein the obtaining, by the access network device, the state information of the downlink channel of the downlink frequency band according to the pilot sequence and the channel reciprocity of the uplink pilot signal comprises:
    and the access network equipment acquires the state information of the downlink channel of the downlink frequency band according to the pilot sequence and the channel reciprocity of the uplink pilot signal sent by the terminal on part of the subcarriers of the more than two subcarriers.
  8. The method according to any one of claims 1 to 7, wherein the obtaining, by the access network device, the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and channel reciprocity includes:
    the access network equipment acquires the state information of the uplink channel of the downlink frequency band according to the uplink pilot signal;
    and the access network equipment acquires the state information of the downlink channel according to the state information of the uplink channel and the channel reciprocity.
  9. The method according to any one of claims 1 to 7,
    the access network device obtains the state information of the downlink channel of the downlink frequency band according to the uplink pilot signal and the channel reciprocity, and the method comprises the following steps:
    the access network equipment acquires the state information of the downlink channel of the downlink frequency band in a first time period according to the uplink pilot signal and the channel reciprocity sent by the terminal in the first time period;
    the access network equipment acquires the state information of the downlink channel of the downlink frequency band in a second time period according to the state information of the downlink channel of the downlink frequency band in the first time period, wherein the second time period is later than the first time period;
    the access network device determines a sending strategy of the downlink signal on the downlink frequency band according to the state information of the downlink channel, and the sending strategy comprises the following steps:
    the access network equipment determines a sending strategy of the downlink signal according to the state information of the downlink channel of the downlink frequency band in the second time period;
    the access network device sends the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal, and the sending strategy comprises the following steps:
    and the access network equipment sends the downlink signal to the terminal on the downlink frequency band in the second time period according to the sending strategy of the downlink signal.
  10. The method according to any one of claims 1 to 9, wherein the transmission strategy of the downlink signal includes at least one of a transmission weight of the downlink signal, a transmission mode of the downlink signal, and a resource allocation of the downlink signal.
  11. The method according to any of claims 3 to 10, wherein the pilot sequence of the uplink pilot signal comprises an orthogonal sequence or a pseudo-orthogonal sequence.
  12. A method for receiving a downlink signal, comprising:
    a terminal sends an uplink pilot signal to access network equipment on at least one subcarrier of a downlink frequency band, wherein the uplink pilot signal is used for the access network equipment to obtain a sending strategy of a downlink signal on the downlink frequency band;
    and the terminal receives the downlink signal sent by the access network equipment on the downlink frequency band according to the sending strategy of the downlink signal.
  13. The method of claim 12, wherein the at least one subcarrier is one subcarrier,
    the terminal sends an uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band, and the method comprises the following steps:
    and the terminal sends the uplink pilot signal to the access network equipment on the subcarrier.
  14. The method of claim 12, wherein the at least one subcarrier is one subcarrier,
    the terminal sends an uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band, and the method comprises the following steps:
    and the terminal sends the pilot frequency sequence of the uplink pilot frequency signal to the access network equipment in n time units of the subcarrier, wherein n is a positive integer.
  15. The method according to claim 14, wherein the terminal sends the pilot sequence of the uplink pilot signal to the access network device within n time units of the subcarrier, including:
    and the terminal sends the pilot sequence of the uplink pilot signal to the access network equipment in n continuous time units or the terminal sends the pilot sequence of the uplink pilot signal to the access network equipment in n discontinuous time units.
  16. The method according to claim 14 or 15, wherein the time unit is a time slot or a symbol time.
  17. The method of claim 12, wherein the at least one subcarrier is more than two subcarriers,
    the terminal sends an uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band, and the method comprises the following steps:
    and the terminal sends the pilot frequency sequence of the uplink pilot frequency signal to the access network equipment on the more than two subcarriers.
  18. The method according to any one of claims 12 to 17,
    the terminal sends an uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band, and the method comprises the following steps:
    the terminal sends the uplink pilot signal to the access network equipment on at least one subcarrier of the downlink frequency band in a first time period;
    the receiving, by the terminal, the downlink signal sent by the access network device on the downlink frequency band according to the sending policy of the downlink signal includes:
    and the terminal receives the downlink signal sent by the access network equipment on the downlink frequency band according to the downlink signal sending strategy in a second time period, wherein the second time period is later than the first time period.
  19. The method according to any of claims 14 to 17, wherein the pilot sequence of the uplink pilot signal comprises an orthogonal sequence or a pseudo-orthogonal sequence.
  20. The method according to any one of claims 12 to 19, wherein the transmission strategy of the downlink signal comprises at least one of a transmission weight of the downlink signal, a transmission mode of the downlink signal, and a resource allocation of the downlink signal.
  21. A downlink signal transmission apparatus, comprising:
    a receiving unit, configured to receive an uplink pilot signal sent by a terminal on at least one subcarrier of a downlink frequency band;
    a processing unit, configured to obtain state information of a downlink channel of the downlink frequency band according to the uplink pilot signal and channel reciprocity, and determine a sending policy of a downlink signal on the downlink frequency band according to the state information of the downlink channel;
    and the sending unit is used for sending the downlink signal to the terminal on the downlink frequency band according to the sending strategy of the downlink signal.
  22. The apparatus of claim 21, wherein the receiving unit is specifically configured to receive the uplink pilot signal sent by the terminal on one subcarrier of the downlink frequency band.
  23. The apparatus according to claim 21, wherein the receiving unit is specifically configured to receive a pilot sequence of the uplink pilot signal sent by the terminal in n time units of one subcarrier of the downlink frequency band, where n is a positive integer; the processing unit is specifically configured to obtain state information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal.
  24. The apparatus of claim 23, wherein the receiving unit is specifically configured to receive a pilot sequence of the uplink pilot signal sent by the terminal in n consecutive time units or is specifically configured to receive a pilot sequence of the uplink pilot signal sent by the terminal in n discontinuous time units.
  25. The apparatus according to claim 21, wherein the receiving unit is specifically configured to receive a pilot sequence of the uplink pilot signal sent by the terminal on two or more subcarriers of the downlink frequency band; the processing unit is specifically configured to obtain state information of the downlink channel of the downlink frequency band according to the pilot sequence and channel reciprocity of the uplink pilot signal.
  26. The apparatus according to claim 25, wherein the processing unit is specifically configured to obtain the status information of the downlink channel of the downlink frequency band according to a pilot sequence and channel reciprocity of the uplink pilot signal sent by the terminal on a part of subcarriers of the two or more subcarriers.
  27. The apparatus according to any one of claims 21 to 26, wherein the processing unit is specifically configured to obtain the status information of the uplink channel of the downlink frequency band according to the uplink pilot signal, and is specifically configured to obtain the status information of the downlink channel according to the status information of the uplink channel and channel reciprocity.
  28. The apparatus according to any one of claims 21 to 26, wherein the processing unit is specifically configured to obtain status information of a downlink channel of the downlink frequency band in a first time period according to an uplink pilot signal and channel reciprocity that are sent by the terminal in the first time period, and specifically configured to obtain status information of a downlink channel of the downlink frequency band in a second time period according to the status information of the downlink channel of the downlink frequency band in the first time period, and specifically configured to determine a sending policy of the downlink signal according to the status information of the downlink channel of the downlink frequency band in the second time period; the transmitting unit is specifically configured to transmit the downlink signal to the terminal on the downlink frequency band in the second time period according to the transmission policy of the downlink signal; wherein the second time period is later than the first time period.
  29. A downlink signal receiving apparatus, comprising:
    a sending unit, configured to send an uplink pilot signal to an access network device on at least one subcarrier of a downlink frequency band, where the uplink pilot signal is used by the access network device to obtain a sending policy of a downlink signal on the downlink frequency band;
    a receiving unit, configured to receive the downlink signal sent by the access network device on the downlink frequency band according to the uplink pilot signal and channel reciprocity.
  30. The apparatus of claim 29, wherein the sending unit is specifically configured to send the uplink pilot signal to the access network device on one subcarrier of the downlink frequency band.
  31. The apparatus of claim 29, wherein the sending unit is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device in n time units of one subcarrier of the downlink frequency band, where n is a positive integer.
  32. The apparatus of claim 31, wherein the sending unit is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device in n consecutive time units or specifically to send the pilot sequence of the uplink pilot signal to the access network device in n discontinuous time units.
  33. The apparatus of claim 29, wherein the sending unit is specifically configured to send the pilot sequence of the uplink pilot signal to the access network device on two or more subcarriers of the downlink frequency band.
  34. The apparatus according to any of claims 29 to 33, wherein the sending unit is specifically configured to send the uplink pilot signal to the access network device on at least one subcarrier of the downlink frequency band in a first time period; the receiving unit is specifically configured to receive, within a second time period, the downlink signal that is sent by the access network device on the downlink frequency band according to the sending policy of the downlink signal, where the second time period is later than the first time period.
CN201580081896.3A 2015-08-14 2015-08-14 The sending method and device of downstream signal, the method for reseptance and device of downstream signal Pending CN107852615A (en)

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