Method, device and system for transmitting uplink measurement reference signal

Abstract

The present invention discloses a method for transmitting an uplink measurement reference signal, which is mainly applied to a network side device, and the method comprises the following steps: the network side device first receives an uplink measurement reference signal sent by a user device, the uplink measurement reference signal carries the downlink interference information of the downlink channel of the network side device, and then performs downlink interference estimation on the uplink measurement reference signal, thereby obtaining the downlink interference information. Compared with the prior art in which the base station cannot obtain the downlink interference information of the downlink channel used by the user device, the network side device can effectively schedule the user device according to the downlink interference information, thereby improving the scheduling efficiency, and thereby improving the data transmission efficiency of the downlink channel.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method, device and system for transmitting an uplink measurement reference signal. Background Art

[0002] A wireless channel is a data signal transmission channel that uses wireless signals as the transmission medium. In the field of wireless communications, the uplink (from user equipment to base station) channel and the downlink (from base station to user equipment) channel of the same frequency band are reciprocal, that is, the uplink channel matrix is ​​the conjugate transpose of the uplink channel matrix.

[0003] In the prior art communication system, the base station usually obtains the uplink channel matrix using the uplink measurement reference signal received from the user equipment, and then obtains the downlink channel matrix using the above reciprocity calculation. The base station then schedules the user equipment and sends downlink data according to the downlink channel matrix.

[0004] However, when receiving downlink data, the user equipment will be affected by the interference of surrounding signals and its own thermal noise. In the prior art, the downlink channel matrix obtained by the base station cannot reflect the interference information on the user equipment side, so the efficiency of the base station scheduling the user equipment according to the downlink channel matrix is ​​not high. Summary of the invention

[0005] The present invention describes a method, device and system for transmitting uplink measurement reference signals for facilitating a base station to obtain downlink interference information of a downlink channel.

[0006] On the one hand, an embodiment of the present invention provides a method for transmitting an uplink sounding reference signal, which is mainly applied to a network side device. The method includes the following steps:

[0007] The network side device first receives an uplink measurement reference signal sent by the user equipment, the uplink measurement reference signal carrying downlink interference information of a downlink channel of the network side device, and then performs downlink interference estimation on the uplink measurement reference signal to obtain the downlink interference information.

[0008] Compared with the prior art in which the base station cannot obtain the downlink interference information of the downlink channel used by the user equipment, the network side device (which may be the base station) in this embodiment can effectively schedule the user equipment according to the downlink interference information, thereby improving the scheduling efficiency and further improving the data transmission efficiency of the downlink channel.

[0009] In a possible design, the uplink measurement reference signal received by the network side device includes an initial first uplink measurement reference signal and a first uplink measurement reference signal with downlink interference information formed;

[0010] The network side device performs downlink interference estimation on the uplink measurement reference signal, and obtaining interference information of the downlink channel may specifically include:

[0011] First, channel estimation is performed on the initial first uplink measurement reference signal to obtain an uplink channel matrix H; and channel estimation is performed on the first uplink measurement reference signal with downlink interference information to obtain a product H*I of the uplink channel matrix H and the downlink interference information I; then the downlink interference information I is calculated based on the uplink channel matrix H and the product H*I of the uplink channel matrix H and the downlink interference information I.

[0012] In one possible design, the uplink measurement reference signal received by the network side device includes a second uplink measurement reference signal shaped using a shaping matrix V and a second uplink measurement reference signal shaped twice using downlink interference information shaping. At this time, the network side device performs downlink interference estimation on the uplink measurement reference signal, and obtaining the interference information of the downlink channel may specifically include:

[0013] First, channel estimation is performed on the V-shaped second uplink measurement reference signal to obtain the product H*V of the uplink channel matrices H and V, and channel estimation is performed on the second uplink measurement reference signal after the secondary shaping to obtain the product H*V*I of the uplink channel matrices H, V and the downlink interference information I; then the downlink interference information is obtained according to the H*V and the product H*V*I of the HV and the downlink interference information I.

[0014] In one possible design, the network side device also sends codebook information to the user equipment, where the codebook information is used to indicate the above-mentioned shaping matrix V used by the user.

[0015] In one possible design, before receiving the uplink measurement reference signal sent by the user equipment, the network side device may also send an indication message to the user equipment, to instruct the user equipment to send the downlink interference information to the network side device, thereby coordinating the direct message transmission between the user equipment and the network side device.

[0016] In one possible design, after obtaining two or more downlink interference information, the network side device may select one of the downlink interference information to send downlink data to the user equipment. Before sending the downlink data, the network side device may send the resource index corresponding to the first uplink measurement reference signal or the second uplink measurement reference signal to the user equipment. The sending resource index may be used to facilitate the user equipment to determine the receiving shaping matrix V used to receive the downlink data sent by the network side device.

[0017] On the other hand, an embodiment of the present application provides a method for transmitting an uplink sounding reference signal, which is applied to a user equipment. The method mainly includes:

[0018] The user equipment first obtains the downlink interference information of the downlink channel of the network side device, and then sends an uplink measurement reference signal to the network side device, and the uplink measurement reference signal carries the downlink interference information. Thus, the network side device can obtain the downlink interference information of the downlink channel according to the uplink measurement reference signal, thereby realizing effective scheduling of the user equipment.

[0019] In one possible design, the user equipment sending an uplink measurement reference signal to the network side device includes:

[0020] The user equipment first sends a first uplink measurement reference signal to the network side device, and uses the downlink interference information to shape the first uplink measurement reference signal; and then sends the shaped first uplink measurement reference signal to the network side device.

[0021] In one possible design, the user equipment uses the same or adjacent time domain resources to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped.

[0022] In one possible design, the user equipment uses the same or adjacent frequency domain resources to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped.

[0023] In one possible design, the user equipment uses the same or different cyclic shifts to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped.

[0024] In one possible design, the user equipment obtains the downlink interference information of the downlink channel of the network side device specifically including: the user equipment calculates the downlink interference information of the downlink channel of the network side device using a transmission mode of transmit diversity or closed-loop spatial multiplexing. Optionally, the user equipment can calculate the downlink interference information of the downlink channel of the network side device.

[0025] In one possible design, the user equipment may send uplink signaling to a network side device, and the uplink signaling carries the above-mentioned transmission diversity or closed-loop spatial multiplexing transmission mode.

[0026] In one possible design, the sending, by the user equipment, of an uplink measurement reference signal to the network side device includes:

[0027] First, a second uplink measurement reference signal shaped by a shaping matrix V is sent to the network side device; then, the V-shaped second uplink measurement reference signal is reshaped using the downlink interference information, and the second uplink measurement reference signal after the reshaping is sent to the network side device.

[0028] In one possible design, the sending, by the user equipment, of an uplink measurement reference signal to the network side device includes:

[0029] First, a shaping matrix V is used to shape the third uplink measurement reference signal, and then the V-shaped third uplink measurement reference signal is reshaped using the downlink interference information, and the secondarily shaped third uplink measurement reference signal is sent to the network side device.

[0030] In one possible design, the user equipment may receive a resource index or codebook information sent by the network side device, and determine a shaping matrix V used to send an uplink measurement reference signal based on the resource index or codebook information.

[0031] In a third aspect, an embodiment of the present invention provides a user equipment, which mainly includes a transceiver and a processor. The processor is used to obtain downlink interference information of a downlink channel of a network side device; the transceiver is used to send an uplink measurement reference signal to the network side device, and the uplink measurement reference signal carries the downlink interference information.

[0032] In one possible design, the transceiver of the user equipment sending the uplink measurement reference signal to the network side device includes:

[0033] An initial first uplink measurement reference signal is sent to the network side device; then the initial first uplink measurement reference signal is shaped using the downlink interference information, and the first uplink measurement reference signal shaped with the downlink interference information is sent to the network side device.

[0034] In one possible design, the transceiver of the user equipment sending the uplink measurement reference signal to the network side device includes:

[0035] A second uplink measurement reference signal shaped by a shaping matrix V is sent to the network side device; then the V-shaped second uplink measurement reference signal is reshaped using the downlink interference information, and the reshaped second uplink measurement reference signal is sent to the network side device.

[0036] In one possible design, the transceiver of the user equipment is also used to receive codebook information sent by the network side device before sending a second uplink measurement reference signal shaped by a shaping matrix V to the network side device, and the processor is also used to obtain the shaping matrix V based on the codebook information.

[0037] In one possible design, the transceiver of the user equipment is also used to receive an indication message sent by the network side device before the processor obtains the downlink interference information of the downlink channel of the network side device, and the indication message is used to instruct the user equipment to send the downlink interference information to the network side device.

[0038] In one possible design, a transceiver of the user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information using the same or adjacent time domain resources, or

[0039] The transceiver of the user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped using the same or adjacent frequency domain resources; or

[0040] The transceiver of the user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped by using the same or different cyclic shifts.

[0041] The time domain resources, frequency domain resources and cyclic shifts may be used in combination. For example, the transceiver of the user equipment uses the same time domain resources and different cyclic shifts to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped.

[0042] Optionally, the user equipment may also use the time domain resources, frequency domain resources and cyclic shift to send the second uplink sounding reference signal shaped by the shaping matrix V and the second uplink sounding reference signal after secondary shaping.

[0043] In a fourth aspect, an embodiment of the present invention provides a network side device, which mainly includes a transceiver and a processor.

[0044] A transceiver, configured to receive an uplink measurement reference signal sent by a user equipment, wherein the uplink measurement reference signal carries downlink interference information of a downlink channel of the network side device;

[0045] The processor is used to perform downlink interference estimation on the uplink measurement reference signal to obtain the downlink interference information.

[0046] In one possible design, the uplink measurement reference signal received by the transceiver of the network side device includes an initial first uplink measurement reference signal and a first uplink measurement reference signal with downlink interference information formed;

[0047] The processor of the network device performs downlink interference estimation on the uplink measurement reference signal to obtain the interference information of the downlink channel, including: performing channel estimation on the initial first uplink measurement reference signal to obtain an uplink channel matrix H; then performing channel estimation on the first uplink measurement reference signal with downlink interference information, and obtaining the product HI of the uplink channel matrix H and the downlink interference information I, thereby obtaining the downlink interference information based on the uplink channel matrix H and the product HI.

[0048] In one possible design, the transceiver of the network side device is also used to send an indication message to the user equipment before receiving the uplink measurement reference signal sent by the user equipment, so as to instruct the user equipment to send the downlink interference information to the network side device.

[0049] In one possible design, the uplink measurement reference signal received by the transceiver of the network side device includes a second uplink measurement reference signal shaped using a shaping matrix V and a second uplink measurement reference signal that performs secondary shaping on the second uplink measurement reference signal shaped using downlink interference information; the processor of the network side device performs downlink interference estimation on the uplink measurement reference signal, and obtaining the interference information of the downlink channel specifically includes:

[0050] Channel estimation is performed on the V-shaped second uplink measurement reference signal to obtain the product HV of the uplink channel matrices H and V, and then channel estimation is performed on the second uplink measurement reference signal after the secondary shaping to obtain the product of the uplink channel matrices H, V and the downlink interference information, thereby obtaining the downlink interference information according to the HV and the product of the HV and the downlink interference information.

[0051] In a fifth aspect, an embodiment of the present invention provides a system for transmitting an uplink sounding reference signal, which includes the user equipment as described in the third aspect and the network side device as described in the fourth aspect.

[0052] In the embodiments described in all the above aspects, the indication message sent by the network side device can be used to instruct the user equipment to send the initial first uplink measurement reference signal and the first uplink measurement reference signal with downlink interference information configuration to the network side device simultaneously or together.

[0053] The indication message sent by the network side device can be used to instruct the user equipment to send the second uplink measurement reference signal with V shaping and the second uplink measurement reference signal after secondary shaping using downlink interference information shaping to the network side device simultaneously or together. The indication message can be uplink measurement reference signal scheduling signaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0055] Figure 1 A schematic diagram of a communication system provided by an embodiment of the present invention;

[0056] Figure 2 is a flow chart of a method for transmitting an uplink sounding reference signal provided by an embodiment of the present invention;

[0057] Figure 3 It is a resource configuration diagram for UE to send an uplink measurement reference signal in an embodiment of the present invention;

[0058] Figure 4 It is another resource configuration diagram for UE to send uplink measurement reference signal in an embodiment of the present invention;

[0059] Figure 5 Another resource configuration diagram for UE to send uplink measurement reference signal in an embodiment of the present invention

[0060] Figure 6 is a schematic diagram of the structure of a network side device provided by an embodiment of the present invention;

[0061] Figure 7 FIG. 1 is a schematic diagram of the structure of a user equipment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0063] In order to solve the problem in the prior art that the base station cannot obtain downlink interference information and thus the scheduling of the user equipment is inefficient, the embodiments of the present invention are based on Figure 1 A solution is proposed in the communication system shown in FIG. 1 to improve the scheduling efficiency of user equipment in the communication system. Figure 1 As shown, an embodiment of the present invention provides a communication system 100. The communication system 100 includes at least one base station (BS) and user equipment (UE). The figure shows multiple base stations BS1-BS3 and multiple user equipment UE1-UE6. Among them, the user equipment and the base station can perform cellular communication, UE1-UE2 are in the coverage range of BS3, UE3-UE4 are in the coverage range of BS1, and UE5-UE6 are in the coverage range of BS2.

[0064] In the embodiment of the present invention, the communication system 100 can be various radio access technology (RAT) systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. The term "system" can be interchangeable with "network". The CDMA system can implement wireless technologies such as universal terrestrial radio access (UTRA), CDMA2000, etc. UTRA can include wideband CDMA (WCDMA) technology and other CDMA variant technologies. CDMA2000 can cover interim standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards. The TDMA system can implement wireless technologies such as the global system for mobile communications (GSM). The OFDMA system can implement wireless technologies such as evolved UTRA (E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are UMTS and UMTS evolution versions. 3GPP's long term evolution (LTE) and various versions based on LTE evolution are new versions of UMTS using E-UTRA. In addition, the communication system 100 can also be applied to future-oriented communication technologies. The system architecture and service scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. It is known to those skilled in the art that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present invention are also applicable to similar technical problems.

[0065] In an embodiment of the present invention, a base station (e.g., BS1-BS3) is a device deployed in a wireless access network to provide wireless communication functions for UE. The base station may include various forms of macro base stations, micro base stations (also known as femeto, pico, small cell in English), relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, in a 5G system, it may be called a gNodeB, a transmission point (TRP). In an LTE system, it is called an evolved NodeB (eNB or eNodeB), and in a third generation (3rd generation, 3G) system, it is called a Node B, etc. For the convenience of description, in all embodiments of the present invention, the above-mentioned base station, Node B, and other devices that provide wireless communication functions for UE are collectively referred to as network side devices.

[0066] The UE involved in the embodiments of the present invention may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication functions. The UE may also be referred to as a mobile station (MS), a user equipment (terminal), a user equipment device (terminal equipment), and may also include a subscriber unit, a cellular phone, a smart phone, a wireless data card, a personal digital assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (handheld), a laptop computer, a cordless phone or a wireless local loop (WLL) station, a machine type communication (MTC) user equipment, etc. In all embodiments of the present invention, the above-mentioned devices are collectively referred to as UE.

[0067] In addition, in Figure 1 In the communication system 100 shown, although base stations BS1-BS3 and multiple UEs are shown, the communication system 100 may not be limited to including the base stations and UEs, but may also include core network equipment or equipment for carrying virtualized network functions, etc. These are obvious to ordinary technicians in the field and will not be described in detail here.

[0068] In the scheme of this embodiment, when UE1 receives downlink data from BS3, the wireless signals transmitted by other base stations (such as BS1 and BS2) will interfere with UE1's downlink data reception. After obtaining the downlink interference information of the downlink channel, UE1 in the embodiment of the present invention directly sends an uplink measurement reference signal to the network side device (such as BS3), and the uplink measurement reference signal carries the downlink interference information. Furthermore, after receiving the uplink measurement reference signal carrying the downlink interference information sent by UE1, the network side device (such as BS3) estimates the downlink interference of the uplink measurement reference signal to obtain the downlink interference information. Compared with the prior art in which the base station BS3 cannot obtain the downlink interference information of the downlink channel used by UE1, BS3 in this embodiment can effectively schedule UE1 according to the downlink interference information, thereby improving the scheduling efficiency and data transmission efficiency.

[0069] See also Figure 2 , Figure 2 It is a flowchart of a method for transmitting an uplink sounding reference signal provided by an embodiment of the present invention.

[0070] In the embodiment of the present invention, a base station (eg, BS3) provides a cellular network for a user equipment (eg, UE1), and UE1 is currently in a connected mode.

[0071] like Figure 2 As shown, UE1 can start the step of sending downlink interference information to BS3 after receiving the indication message (step 102) from base station BS3. UE1 can also actively send downlink interference information to BS3 when in a connected state. In addition, UE1 can periodically send downlink interference information to BS3 to facilitate BS3 to receive the downlink interference information.

[0072] Before sending the downlink interference information to BS3, UE1 first obtains the downlink interference information of the downlink channel of BS3 (step 104), and then sends an uplink measurement reference signal carrying the downlink interference information to BS3. UE1 can calculate the downlink interference information based on a specific transmission mode, such as transmit diversity or closed-loop spatial multiplexing, and the downlink interference information can correspond to a specific transmission mode. After obtaining the downlink interference information based on a specific transmission mode, UE1 can notify the base station BS3 of the transmission mode. UE1 can send the determined transmission mode to BS3 through newly added uplink signaling or by using the above-mentioned uplink measurement reference signal, and then the base station BS3 can use the transmission mode determined by UE1 to send downlink data, and the data transmission efficiency is higher. In addition, UE1 can also calculate the downlink interference information not based on a specific mode, and send the downlink interference information to the base station BS3, and the base station BS3 can obtain the downlink interference information that has not been processed.

[0073] It should be noted that there is no clear timing relationship between steps 102 and 104. UE1 can obtain the downlink interference information of the downlink channel before receiving the indication message from BS3, and can also obtain the downlink interference information of the downlink channel after receiving the indication message from BS3.

[0074] In step 104, UE1 may send an uplink measurement reference signal to BS3 in the following manner.

[0075] Mode 1a: UE1 sends an initial first uplink measurement reference signal to BS3, uses the downlink interference information obtained in step 102 to shape the initial first uplink measurement reference signal, and then sends the shaped first uplink measurement reference signal to BS3.

[0076] Among them, the uplink measurement reference signal can also be called an uplink sounding reference signal (SRS), which can be a standard sequence, such as a Zad-off Chu sequence. In addition, the initial first uplink measurement reference signal can also be called a first uplink measurement reference signal without downlink interference shaping, and the purpose of the above "first" is to distinguish it from the subsequent "second". The shaping method can be beamforming or modulation.

[0077] Mode 2a, UE1 sends a second uplink measurement reference signal shaped by a shaping matrix V to BS3, then reshapes the second uplink measurement reference signal shaped by V using downlink interference information, and then sends the reshaped second uplink measurement reference signal to BS3.

[0078] The shaping matrix V may come from the codebook information (which may be referred to as the codebook) sent by BS3, and UE1 obtains the shaping matrix V according to the codebook information. In addition, UE1 may also perform channel estimation on the downlink channel of base station BS3 to obtain the downlink channel matrix, and then use the downlink channel matrix to calculate the shaping matrix V. For example, singular value decomposition (SVD) is performed on the downlink channel matrix.

[0079] The above-mentioned V-shaped second uplink measurement reference signal can also be called the second uplink measurement reference signal without downlink interference shaping, and the second uplink measurement reference signal after secondary shaping can also be called the second uplink measurement reference signal after shaping with downlink interference information. Compared with the above-mentioned method 1a, the method of the second uplink measurement reference signal provided by method 2a can improve the coverage of the uplink measurement reference signal sent by UE1, improve the signal to noise ratio of the uplink measurement reference signal received by BS3, or under the condition of the same signal to noise ratio, reduce the power of UE1 sending the uplink measurement reference signal, and save the power consumption of UE1.

[0080] In the embodiments provided in Mode 1 and Mode 2, after UE1 uses the downlink interference information to shape the above-mentioned first uplink measurement reference signal and the second uplink measurement reference signal, the first uplink measurement reference signal and the second uplink measurement reference signal can carry the downlink interference information. UE1 can send the second uplink measurement reference signal after V shaping and the second uplink measurement reference signal after secondary shaping through specific resources, such as subframes. UE1 can send the above-mentioned first uplink measurement reference signal without downlink interference shaping and the first uplink measurement reference signal after downlink interference information shaping through a composite signal, or it can send the above-mentioned first uplink measurement reference signal without downlink interference shaping and the first uplink measurement reference signal after downlink interference information shaping separately. Correspondingly, UE1 can also send the above-mentioned second uplink measurement reference signal without downlink interference shaping and the second uplink measurement reference signal after downlink interference information shaping through a composite signal, or it can send the above-mentioned second uplink measurement reference signal without downlink interference shaping and the second uplink measurement reference signal after downlink interference information shaping separately.

[0081] Continue to see Figure 2 When the base station BS3 needs to obtain the downlink interference information of UE1 (for example, when BS3 needs to send downlink data to UE1), it sends an indication message to UE1 (step 102), instructing UE1 to send the downlink interference information to BS3. The indication message sent by BS3 can be specifically an uplink measurement reference signal scheduling signaling, and the indication message can also be sent through physical layer signaling, radio resource control layer signaling, or medium access control control element (MACCE) layer signaling.

[0082] In an optional embodiment, BS3 may also determine the transmission mode corresponding to the downlink interference information, such as transmit diversity or closed-loop spatial multiplexing, and then notify UE1 of the determined transmission mode. BS3 may carry the determined transmission mode in the above indication message and send it to UE1, or may add downlink signaling to UE1, or may pre-configure it to UE1, and UE1 obtains the downlink interference information corresponding to the transmission mode according to the transmission mode determined by BS3.

[0083] After sending the above indication message, BS3 will receive the uplink measurement reference signal carrying downlink interference information sent by UE1 (step 106). BS3 performs downlink interference estimation on the received uplink measurement reference signal to obtain downlink interference information (step 108), and then BS3 can schedule UE1 according to the downlink interference information and then send downlink data to UE1.

[0084] In step 108, BS3 may obtain downlink interference information in the following manner.

[0085] In method 1b, BS3 performs channel estimation on the first uplink measurement reference signal without downlink interference information to obtain an uplink channel matrix H; performs channel estimation on the first uplink measurement reference signal with downlink interference information to obtain the product H*I of the uplink channel matrix H and the downlink interference information I; and then obtains the downlink interference information based on the uplink channel matrix H and the product HI.

[0086] Corresponding to the above-mentioned mode 1a, since UE1 sends the first uplink measurement reference signal without downlink interference information and the first uplink measurement reference signal with downlink interference information, BS3 performs channel estimation on the received first uplink measurement reference signal without downlink interference information and obtains the uplink channel matrix H. BS3 also performs channel estimation on the first uplink measurement reference signal with downlink interference information and obtains the product H*I of the uplink channel matrix H and the downlink interference information I. BS3 can further obtain the downlink interference information I according to the product of H*I and the matrix H of the uplink channel.

[0087] 2b. BS3 performs channel estimation on the second uplink measurement reference signal shaped by V to obtain the product HV of the uplink channel matrix H and V; performs channel estimation on the second uplink measurement reference signal after secondary shaping to obtain the product of the uplink channel matrix H, V and the downlink interference information, and then obtains the downlink interference information according to HV and the product of HV and the downlink interference information.

[0088] Corresponding to the above-mentioned method 2a, since UE1 sends a second uplink measurement reference signal shaped by the shaping matrix V and a second uplink measurement reference signal that performs secondary shaping on the second uplink measurement reference signal shaped by V using the downlink interference information, BS3 performs channel estimation on the received second uplink measurement reference signal shaped without downlink interference information, and obtains the product H*V of the uplink channel matrix H and the shaping matrix V. BS3 also performs channel estimation on the second uplink measurement reference signal shaped with downlink interference information, and obtains the product H*V*I of the uplink channel matrix H, the shaping matrix V and the downlink interference information I. BS3 can obtain the downlink interference information I according to the product of H*V*I and the product of H*V.

[0089] In the embodiments provided in the above methods 1b and 2b, the channel estimation method adopted by the base station BS3 may be, for example, a minimum mean square error (MMSE) method.

[0090] In an embodiment of the method for transmitting an uplink measurement reference signal provided in an embodiment of the present invention, UE1 may use the same or adjacent time domain resources to send the first uplink measurement reference signal without downlink interference information filling and the first uplink measurement reference signal after the downlink interference information filling, or UE1 may use the same or adjacent frequency domain resources to send the first uplink measurement reference signal without downlink interference information filling and the first uplink measurement reference signal after the downlink interference information filling. UE1 may also use the same or different cyclic shifts to send the first uplink measurement reference signal without downlink interference information filling and the first uplink measurement reference signal after the downlink interference information filling. In addition, the above-mentioned time domain resources, frequency domain resources and cyclic shifts may be used in combination, for example, UE1 uses the same time domain resources and adjacent frequency domain resources, the same time domain resources and different cyclic shifts to send the first uplink measurement reference signal without downlink interference information filling and the first uplink measurement reference signal after the downlink interference information filling. It should be pointed out that the above only gives the method for sending the first uplink measurement reference signal without downlink interference information shaping and the first uplink measurement reference signal after shaping with downlink interference information, and the above-mentioned method for sending time domain resources, frequency domain resources and cyclic shift can also be applied to the second uplink measurement reference signal with V shaping and the second uplink measurement reference signal with secondary shaping using downlink interference information.

[0091] like Figure 3 As shown, Figure 3 It is a resource configuration diagram for UE1 to send an uplink measurement reference signal in an embodiment of the present invention. Among them, UE1 sends the first uplink measurement reference signal SRS1(θ1) without downlink interference information shaping and the first uplink measurement reference signal SRS2(θ2) with downlink interference information shaping on the same time domain resources, such as sub-frame, the same frequency domain resources, such as comb, and different cyclic shifts, thereby ensuring the orthogonality of the two signals SRS1(θ1) and SRS2(θ2). Among them, θ1 and θ2 represent different cyclic shifts or phases, and the sequence of SRS1(θ1) can be e jθ1n The sequence of F(n), SRS2(θ2) can be e jθ2n F(n). SRS1(θ1) and SRS2(θ2) can be located in the same cluster.

[0092] In addition, SRS1(θ1) may also represent a second uplink sounding reference signal shaped by a shaping matrix V, and SRS2(θ2) may also represent a second uplink sounding reference signal shaped by downlink interference information.

[0093] Figure 4Another optional resource configuration diagram for UE to send uplink measurement reference signal is also shown. Among them, UE sends the first uplink measurement reference signal SRS1 without downlink interference information shaping and the first uplink measurement reference signal SRS2 with downlink interference information shaping on the same time domain resources, such as sub-frame, in different clusters (such as adjacent clusters), thereby ensuring the orthogonality of the two signals SRS1 and SRS2. Among them, SRS1 can also represent the second uplink measurement reference signal shaped by the shaping matrix V, and SRS2 can also represent the second uplink measurement reference signal with downlink interference information shaping. In the above Figure 3-4 In the resource configuration diagram shown, the horizontal axis represents time (subframe), and the left-hand and right-hand diagonal lines represent different clusters.

[0094] Figure 5 Another optional resource configuration diagram for UE to send an uplink measurement reference signal is also shown. Among them, the UE sends the first uplink measurement reference signal SRS1 without downlink interference information shaping and the first uplink measurement reference signal SRS2 with downlink interference information shaping in the same sub-frame and different symbols, thereby ensuring the orthogonality of the two signals SRS1 and SRS2, and further increasing the cumulative power of the uplink measurement reference signal transmission. Among them, SRS1 can also represent the second uplink measurement reference signal shaped by the shaping matrix V, and SRS2 can also represent the second uplink measurement reference signal shaped by downlink interference information. Among them, SRS1 and SRS2 can use the same or different frequency domain resources, which is not limited in this embodiment.

[0095] In the above Figure 5 In the resource configuration diagram shown, the horizontal axis is time (subframe), and the left and right slashes represent different symbols. Figure 3-5As can be seen from the resource configuration diagram shown, UE1 can periodically send the above-mentioned uplink measurement reference signal, for example, once every 2 subframes. In addition, UE1 can also send multiple uplink measurement reference signals for different purposes (for example, UE1 sends uplink measurement reference signals respectively when it is at the edge of the cell or the center of the cell), for example, the first subframe sends the second uplink measurement reference signal shaped by the shaping matrix V1 and the second uplink measurement reference signal with downlink interference information and V1 secondary shaping, and the fourth subframe sends the second uplink measurement reference signal shaped by the shaping matrix V2 and the second uplink measurement reference signal with downlink interference information and V2 secondary shaping. The base station BS3 can select one of the uplink measurement reference signals for channel and interference estimation (for example, select the second uplink measurement reference signal shaped by V2 sent in the fourth subframe and the second uplink measurement reference signal with downlink interference information and V2 secondary shaping), and then determine the shaping mode W and modulation and coding scheme (MCS) level of BS3 in downlink data transmission. Correspondingly, when UE1 uses the shaped matrix V2 when sending the second uplink measurement reference signal, UE1 may also use the shaped matrix V2 to receive the downlink data. In order to ensure that UE1 uses the shaped matrix V2 to receive data, the base station may indicate V2 to UE1 through codebook information (the codebook information mentioned in 2a above), and UE1 obtains the shaped matrix V2 according to the codebook information. In addition, BS3 may also inform UE1 of the resource index of the second uplink measurement reference signal (the uplink measurement reference signal may be understood as a resource), and UE1 determines the corresponding V2-shaped second uplink measurement reference signal according to the resource index, and then learns that the shaped matrix V2 is used when sending the second uplink measurement reference signal.

[0096] For the case where UE1 sends one type of uplink measurement reference signal, for example, the first subframe sends the second uplink measurement reference signal shaped by the shaping matrix V1 and the second uplink measurement reference signal with downlink interference information and V1 secondary shaping, and the fourth subframe sends the second uplink measurement reference signal shaped by the shaping matrix V1 and the second uplink measurement reference signal with downlink interference information and V1 secondary shaping. BS3 does not need to instruct the terminal to receive shaping information, and the transceiver antennas of UE1 maintain the same shaping to receive the downlink data of BS1. In addition, when UE1 uses method 1a or 1b to send the uplink measurement reference signal, the transceiver antennas of UE1 can also maintain the same shaping to receive the downlink data of BS1.

[0097] In the above-mentioned embodiments of the present invention, the uplink measurement reference signal transmission method provided by the embodiments of the present invention is introduced from the perspectives of the user equipment and the base station itself, and the interaction between the user equipment and the base station. It can be understood that in order to realize the above-mentioned functions, each network element, such as a user equipment, a base station, etc., includes a hardware structure and / or software module corresponding to each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0098] Figure 6 A possible structural diagram of a network side device provided by an embodiment of the present invention is shown. The network side device may be as follows Figure 1-2 Base stations BS1, BS2 and BS3 are shown.

[0099] The network side device provided in this embodiment mainly includes:

[0100] In a fourth aspect, an embodiment of the present invention provides a network side device, which mainly includes a transceiver 601 and a processor 602 (also referred to as a controller). In addition, the network side device may further include a memory 603 .

[0101] The transceiver 601 is mainly used for the network side device to receive and send signals, for example, to receive an uplink measurement reference signal sent by a user equipment, wherein the uplink measurement reference signal carries downlink interference information of a downlink channel of the network side device;

[0102] The processor 602 is mainly used to control and manage the network side device, for example, to perform downlink interference estimation on the uplink measurement reference signal received by the transceiver 601 to obtain the downlink interference information. As an example, the controller / processor 602 is used to support the network side device to implement Figure 2 The method steps on the base station BS3 side in the embodiment of the present invention are as follows, for example, step 108. The memory 603 is used to store program codes and data for the network side device.

[0103] Optionally, the uplink measurement reference signal received by the transceiver 601 of the network side device includes an initial first uplink measurement reference signal and a first uplink measurement reference signal with downlink interference information. The processor 602 of the network device performs downlink interference estimation on the uplink measurement reference signal, and obtains the interference information of the downlink channel. The relevant description of method 1b in the above method embodiment can be referred to, which will not be repeated here.

[0104] Optionally, the uplink measurement reference signal received by the transceiver 601 of the network side device includes a second uplink measurement reference signal shaped using a shaping matrix V and a second uplink measurement reference signal that is secondary shaped using downlink interference information to the second uplink measurement reference signal shaped by V; the processor of the network side device performs downlink interference estimation on the uplink measurement reference signal, and obtains the interference information of the downlink channel. For details, please refer to the description related to method 2b in the above method embodiment, which will not be repeated here.

[0105] Optionally, the transceiver 601 of the network side device is further used to send an indication message to the user equipment before receiving the uplink sounding reference signal sent by the user equipment, so as to instruct the user equipment to send the downlink interference information to the network side device.

[0106] Understandably, Figure 6 Only a simplified design of the network side device is shown. In practical applications, the network side device may include any number of transmitters, receivers, processors, controllers, modulators, memories, etc., and all network side devices that can implement the present invention are within the protection scope of the present invention.

[0107] Figure 7 A possible structural diagram of a user equipment provided by an embodiment of the present invention is shown. The user equipment may be as follows Figure 1-2 Base stations UE1-UE6 are shown.

[0108] The user equipment provided in this embodiment mainly includes: a transceiver 701 and a processor 702 (also referred to as a controller). In addition, the user equipment may also include a memory 703 .

[0109] The processor 702 is mainly used to control and manage the user equipment, for example, to obtain downlink interference information of the downlink channel of the network side device. The transceiver 701 is mainly used for the user equipment to receive and send signals, for example, to send an uplink measurement reference signal to the network side device, and the uplink measurement reference signal carries the downlink interference information. As an example, the controller / processor 702 is used to support the user equipment to implement Figure 2 The method steps on the UE1 side in the embodiment, for example, step 104. The memory 703 is used to store program codes and data for the user equipment.

[0110] Optionally, the transceiver 701 of the user equipment sends the uplink measurement reference signal to the network side device by specifically adopting the relevant description of 1a or 2a in the above-mentioned method embodiment, which will not be repeated here. Furthermore, the transceiver 701 of the user equipment may use the same or adjacent time domain resources to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is configured. The transceiver 701 of the user equipment may also use the same or adjacent frequency domain resources to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is configured. The transceiver 701 of the user equipment may also use the same or different cyclic shifts to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is configured. The transceiver 701 of the user equipment may also use the same time domain resources and different cyclic shifts to send the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is configured. For the specific sending process, please refer to Figure 3-5 Related description.

[0111] Optionally, the transceiver 701 of the user equipment is also used to receive codebook information sent by the network side device before sending a second uplink measurement reference signal shaped using the shaping matrix V to the network side device, and the processor 702 is also used to obtain the shaping matrix V based on the codebook information.

[0112] Optionally, the transceiver 701 of the user equipment is also used to receive an indication message sent by the network side device before the processor 702 obtains the downlink interference information of the downlink channel of the network side device, and the indication message is used to instruct the user equipment to send the downlink interference information to the network side device.

[0113] Among them, the indication message sent by the network side device can be used to instruct the user equipment to send the initial first uplink measurement reference signal and the first uplink measurement reference signal with downlink interference information shaping to the network side device simultaneously or together. The indication message can also be used to instruct the user equipment to send the second uplink measurement reference signal with V shaping and the second uplink measurement reference signal after secondary shaping using downlink interference information shaping to the network side device simultaneously or together. The indication message can be an uplink measurement reference signal scheduling signaling.

[0114] Understandably, Figure 7 Only a simplified design of the user equipment is shown. In practical applications, the user equipment may include any number of transmitters, receivers, processors, controllers, modulators, memories, displays, etc., and all user equipment that can implement the present invention are within the protection scope of the present invention.

[0115] An embodiment of the present invention further provides a system for transmitting an uplink sounding reference signal, which includes the user equipment and the network side equipment as described in the above embodiment. The specific structures and functions of the user equipment and the network side equipment refer to the relevant description of the above embodiment and will not be repeated here.

[0116] The steps of the method or algorithm described in conjunction with the disclosure of the embodiments of the present invention can be implemented in a hardware manner, or can be implemented by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a memory, a flash memory, a read-only memory, a register, a hard disk, a mobile hard disk, an optical disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a user device. Of course, the processor and the storage medium can also be present in the user device as discrete components.

[0117] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented using software, the functions may be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium may be any available medium that a general or special-purpose computer can access.

[0118] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solution of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for transmitting an uplink measurement reference signal, characterized in that: Applied to user equipment, the method includes: receiving an indication message sent by a network side device, where the message is used to instruct the user equipment to send downlink interference information to the network side device; Acquiring downlink interference information of a downlink channel of the network side device; Sending an uplink measurement reference signal to the network side device, where the uplink measurement reference signal carries the downlink interference information; The user equipment obtaining the downlink interference information of the downlink channel of the network side device specifically includes: The user equipment calculates and obtains downlink interference information of a downlink channel of a network side device by using a transmission mode of transmit diversity or closed-loop spatial multiplexing.

2. The method according to claim 1, characterized in that The sending an uplink measurement reference signal to the network side device includes: Sending an initial first uplink measurement reference signal to the network side device; Using the downlink interference information to shape the initial first uplink measurement reference signal; Sending the first uplink measurement reference signal after the downlink interference information is shaped to the network side device.

3. The method according to claim 1, characterized in that The user equipment sending an uplink measurement reference signal to the network side device includes: Sending a second uplink measurement reference signal shaped by a shaping matrix V to the network side device; Reshaping the V-shaped second uplink measurement reference signal using the downlink interference information; Sending the second uplink sounding reference signal after the secondary shaping to the network side device.

4. The method according to claim 3, characterized in that Before the user equipment sends a second uplink sounding reference signal shaped by a shaping matrix V to the network side device, the method further includes: The user equipment receives the codebook information sent by the network side equipment, and obtains the shaping matrix V according to the codebook information.

5. The method according to claim 2 or 3, characterized in that: Before the user equipment obtains the downlink interference information of the downlink channel of the network side device, the method further includes: receiving an indication message sent by the network side device, where the indication message is used to instruct the user equipment to send an initial first uplink measurement reference signal and a first uplink measurement reference signal after downlink interference information is formed, or An indication message sent by the network side device is received, where the indication message is used to instruct the user equipment to send a second uplink measurement reference signal with V shaping and a second uplink measurement reference signal after secondary shaping.

6. The method according to claim 2, characterized in that The user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped using the same or adjacent time domain resources, or The user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped using the same or adjacent frequency domain resources; or The user equipment sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped by using the same or different cyclic shifts.

7. A method for transmitting an uplink measurement reference signal, applied to a network side device, characterized in that: The method includes: Sending an indication message to a user equipment, where the message is used to instruct the user equipment to send downlink interference information to the network side device; receiving an uplink measurement reference signal sent by the user equipment, where the uplink measurement reference signal carries downlink interference information of a downlink channel of the network side device; Performing downlink interference estimation on the uplink measurement reference signal to obtain the downlink interference information; The downlink interference information of the downlink channel of the network side device includes the downlink interference information of the downlink channel of the network side device calculated by the user equipment using a transmission mode of transmit diversity or closed-loop spatial multiplexing.

8. The method according to claim 7, characterized in that The uplink measurement reference signal received by the network side device includes an initial first uplink measurement reference signal and a first uplink measurement reference signal with downlink interference information formed; The performing downlink interference estimation on the uplink measurement reference signal to obtain the interference information of the downlink channel includes: Performing channel estimation on the initial first uplink measurement reference signal to obtain an uplink channel matrix H; Performing channel estimation on the first uplink measurement reference signal shaped with downlink interference information to obtain a product HI of the uplink channel matrix H and the downlink interference information I; The downlink interference information is obtained according to the uplink channel matrix H and the product HI.

9. The method according to claim 8, characterized in that The uplink measurement reference signal includes a second uplink measurement reference signal shaped by a shaping matrix V and a second uplink measurement reference signal obtained by reshaping the second uplink measurement reference signal shaped by V by using downlink interference information; The performing downlink interference estimation on the uplink measurement reference signal to obtain the interference information of the downlink channel specifically includes: Performing channel estimation on the V-shaped second uplink sounding reference signal to obtain a product HV of an uplink channel matrix H and V; Performing channel estimation on the second uplink measurement reference signal after the secondary shaping to obtain the product of the uplink channel matrix H, V and the downlink interference information; The downlink interference information is obtained according to the HV and the product of the HV and the downlink interference information.

10. The method according to claim 7, characterized in that The indication message sent by the network side device is uplink sounding reference signal scheduling signaling.

11. A user equipment, characterized in that: include: A processor, used to obtain downlink interference information of a downlink channel of a network side device; A transceiver, configured to send an uplink measurement reference signal to the network side device, wherein the uplink measurement reference signal carries the downlink interference information; The transceiver is further configured to receive an indication message sent by the network side device before the processor obtains the downlink interference information of the downlink channel of the network side device, wherein the indication message is used to instruct the user equipment to send the downlink interference information to the network side device; The processor is used to obtain the downlink interference information of the downlink channel of the network side device, specifically including: the user equipment uses the transmission mode of transmit diversity or closed-loop spatial multiplexing to calculate the downlink interference information of the downlink channel of the network side device.

12. The user equipment according to claim 11, characterized in that The transceiver sending an uplink measurement reference signal to a network side device includes: Sending an initial first uplink measurement reference signal to the network side device; Using the downlink interference information to shape the initial first uplink measurement reference signal; Sending the first uplink measurement reference signal after the downlink interference information is shaped to the network side device.

13. The user equipment according to claim 11, characterized in that The transceiver sending an uplink measurement reference signal to a network side device includes: Sending a second uplink measurement reference signal shaped by a shaping matrix V to the network side device; Reshaping the V-shaped second uplink measurement reference signal using the downlink interference information; Sending the second uplink sounding reference signal after the secondary shaping to the network side device.

14. The user equipment according to claim 13, characterized in that The transceiver is further configured to receive codebook information sent by the network side device before sending a second uplink measurement reference signal shaped by a shaping matrix V to the network side device, and the processor is further configured to obtain the shaping matrix V according to the codebook information.

15. The user equipment according to claim 12, characterized in that The transceiver sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information using the same or adjacent time domain resources, or The transceiver sends the initial first uplink measurement reference signal and the first uplink measurement reference signal after the downlink interference information is shaped using the same or adjacent frequency domain resources; or The transceiver sends the initial first uplink sounding reference signal and the first uplink sounding reference signal after the downlink interference information is shaped by using the same or adjacent cyclic shift.

16. A network side device, characterized in that: include: A transceiver, configured to receive an uplink measurement reference signal sent by a user equipment, wherein the uplink measurement reference signal carries downlink interference information of a downlink channel of the network side device; A processor, configured to perform downlink interference estimation on the uplink measurement reference signal to obtain the downlink interference information; The transceiver is further configured to, before receiving an uplink measurement reference signal sent by the user equipment, send an indication message to the user equipment, to instruct the user equipment to send the downlink interference information to the network side device; The downlink interference information of the downlink channel of the network side device includes the downlink interference information of the downlink channel of the network side device calculated by the user equipment using a transmission mode of transmit diversity or closed-loop spatial multiplexing.

17. The network side device according to claim 16, characterized in that: The uplink measurement reference signal received by the transceiver includes an initial first uplink measurement reference signal and a first uplink measurement reference signal with downlink interference information formed; The processor performs downlink interference estimation on the uplink measurement reference signal to obtain interference information of the downlink channel, including: Performing channel estimation on the initial first uplink measurement reference signal to obtain an uplink channel matrix H; Performing channel estimation on the first uplink measurement reference signal shaped with downlink interference information to obtain a product HI of the uplink channel matrix H and the downlink interference information I; The downlink interference information is obtained according to the uplink channel matrix H and the product HI.

18. The network side device according to claim 16, characterized in that: The uplink measurement reference signal received by the transceiver includes a second uplink measurement reference signal shaped using a shaping matrix V and a second uplink measurement reference signal obtained by reshaping the second uplink measurement reference signal shaped using downlink interference information; The processor performs downlink interference estimation on the uplink measurement reference signal to obtain the interference information of the downlink channel specifically including: Performing channel estimation on the V-shaped second uplink sounding reference signal to obtain a product HV of an uplink channel matrix H and V; Performing channel estimation on the second uplink measurement reference signal after the secondary shaping to obtain the product of the uplink channel matrix H, V and the downlink interference information; The downlink interference information is obtained according to the HV and the product of the HV and the downlink interference information.

19. The network side device according to claim 16, characterized in that: The indication message sent by the transceiver is uplink sounding reference signal scheduling signaling.

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