CN106851660B - Signal interference measurement method, base station and user equipment - Google Patents
Signal interference measurement method, base station and user equipment Download PDFInfo
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- CN106851660B CN106851660B CN201611249156.9A CN201611249156A CN106851660B CN 106851660 B CN106851660 B CN 106851660B CN 201611249156 A CN201611249156 A CN 201611249156A CN 106851660 B CN106851660 B CN 106851660B
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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
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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Abstract
The embodiment of the invention discloses a signal interference measurement method, a base station and user equipment, which can reduce the complexity of interference measurement. The method of the embodiment of the invention comprises the following steps: the base station receives an uplink scheduling request of UE1, and selects UE2 according to downlink channel conditions of each UE in a cell; the base station sets user-level pilot configuration of UE2, wherein the pilot configuration comprises silence time-frequency resources; then, the base station controls the UE1 to send a pilot signal on the silence time-frequency resource, the UE2 measures an interference value of the UE1 to the UE2 according to the received pilot signal, and when the interference value of the UE1 to the UE2 is lower than an interference threshold value of the UE2, the base station determines that the time-frequency resource occupied by the downlink of the UE2 may be the time-frequency resource of the uplink data of the UE 1. The embodiment of the invention adopts the existing commercial system pilot frequency condition to measure the interference between the user equipment, and does not need to adopt an unauthorized frequency spectrum to measure, thereby reducing the complexity of measurement.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a signal interference measurement method, a base station, and a user equipment.
Background
In a traditional Frequency Division Duplex (FDD) and Time Division Duplex (TDD) scenario, a User Equipment (UE) uses different resources and an evolved NodeB (eNB) for communication. As shown in fig. 1, in the FDD scenario, different frequency bands on carrier frequency f1 are used for UE1 and UE2 uplink to communicate with eNB, and no interference is formed between UEs. In the TDD scenario, the resources between UEs are orthogonal and do not interfere with each other.
However, when full duplex communication is employed, interference between UEs may occur. In a full-duplex networking scenario, the eNB and the UE perform uplink and downlink communication by using the same carrier frequency, as shown in the left diagram of fig. 2, the UE1 performs uplink transmission by using f1, and the UE2 performs downlink reception by using f1, if the UE1 and the UE2 are closer to each other, the UE2 receives a transmission signal of the UE1 with the same frequency, and the UE2 forms severe interference with the reception of the UE 1. As shown in the right diagram of fig. 2, in the case of time division multiple access, if the UE1 and the UE2 use different slot ratios, for example, if the 4 th slot of the UE1 uses uplink transmission (U) and the 4 th slot of the UE2 uses downlink reception (D), if the distances between the UE1 and the UE2 are relatively short, the UE1 will cause severe inter-user interference to the UE2 in the 4 th slot.
In the current full-duplex application scenario, the interference between UEs needs to be measured to perform appropriate resource scheduling, thereby reducing the interference between UEs. At present, the measurement of the inter-UE interference mainly adopts an unlicensed spectrum, and there are certain problems in the accuracy and the applicability of the measurement, for example, the inter-UE interference is measured by means of Wireless local area network (Wifi) and the like, and the UE needs to additionally perform pilot frequency transmission and measurement in the Wifi frequency band, so that the method for measuring the inter-UE interference is complex in flow.
Disclosure of Invention
The embodiment of the invention provides a signal interference measurement method, a base station and user equipment, which can use the existing commercial system pilot frequency condition to carry out interference measurement between UE and reduce the complexity of interference measurement.
In a first aspect, an embodiment of the present invention provides a signal interference measurement method, where the method includes:
and the base station receives an uplink scheduling request of the first user equipment, selects second user equipment according to the downlink channel condition of each user equipment in the cell, and takes the time-frequency resource occupied by the downlink of the second user equipment as a target time-frequency resource. The base station sets user-level pilot frequency configuration of second user equipment, wherein the user-level pilot frequency configuration comprises silence time-frequency resources; then, the base station controls the first user equipment to send a pilot signal on the silence time-frequency resource, the second user equipment receives the pilot signal, and the interference value of the first user equipment to the second user equipment is measured according to the pilot signal; and when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment.
Aiming at the problem of interference between user equipment in the current full-duplex networking scene, the embodiment of the invention adopts the existing commercial system pilot frequency condition to measure the interference between the user equipment without adopting an unauthorized frequency spectrum, thereby reducing the measurement complexity.
In some specific embodiments, when the scheduling of the uplink time-frequency resource of the base station is full, that is, the uplink resource of the cell is insufficient, the base station selects the second user equipment according to the downlink channel condition of each user equipment in the cell, and determines that the first user equipment can reuse the downlink time-frequency resource of the second user equipment when it is determined that the interference of the first user equipment to the second user equipment is smaller than the interference threshold of the second user equipment through the pilot signal, thereby improving the spectrum utilization rate and the system capacity on the basis of avoiding the interference between users.
In some specific embodiments, when the base station selects the second user equipment according to the downlink channel condition of each user equipment in the cell, specifically, the signal-to-noise ratio of the downlink channel of each user equipment in the cell is obtained, and the second user equipment with the highest signal-to-noise ratio is selected from the signal-to-noise ratios of the downlink channels of each user equipment.
In some specific embodiments, if the first user equipment is located at the edge of the cell, it is further required to determine whether the first user equipment causes interference to a third user equipment using the target time-frequency resource in a neighboring cell. The specific determination process is as follows: when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment, the base station sends the target time-frequency resource to an adjacent base station (namely, a base station of a cell adjacent to the first user equipment), the adjacent base station determines a third user equipment occupying the target time-frequency resource for downlink, and if the interference value of the first user equipment to the third user equipment is lower than the interference threshold value of the third user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of uplink data of the first user equipment.
Specifically, the method for measuring the interference value of the first user equipment to the third user equipment is the same as the method for measuring the interference value of the first user equipment to the second user equipment, that is, the first user equipment is controlled to transmit a pilot signal in a silent time-frequency resource configured by the pilot signal by setting user-level pilot configuration of the third user equipment, and the third user equipment receives the pilot signal and measures the interference value of the first user equipment to the second user equipment according to the pilot signal.
In the embodiment of the invention, if the UE is positioned at the edge of the cell, the interference between the UE and the user of the adjacent cell is measured, so that the interference between the UE and the user of the adjacent cell can be avoided, and the realizability of the scheme can be improved.
In some specific embodiments, the interference value of the pilot signal measured by the second user equipment is directly used as the interference value of the first user equipment to the second user equipment.
In some specific embodiments, the base station controls the second user equipment to measure a base noise value of the second user equipment and interference values of other cells in addition to the interference value of the pilot signal measured by the second user equipment, subtracts the base noise value from the interference value of the pilot signal measured by the second user equipment, and subtracts the interference values of the other cells to obtain a difference value, where the difference value is the interference value of the first user equipment to the second user equipment.
By the method, the interference value of the measured pilot signal is subtracted by the self bottom noise of the second user equipment and the interference of other cells, the interference of external factors is removed, and the more accurate interference value of the first user equipment to the second user equipment can be obtained.
In some specific embodiments, after the second user equipment measures the interference value of the first user equipment to the second user equipment through the pilot signal, the second user equipment determines whether the interference value is lower than an interference threshold value of the second user equipment, and sends the determination result to the base station.
In some specific embodiments, after the second user equipment measures the interference value of the first user equipment to the second user equipment through the pilot signal, the second user equipment may also send the interference value to the base station, and the base station determines whether the interference value is lower than an interference threshold value of the second user equipment.
In a second aspect, an embodiment of the present invention further provides a signal interference measurement method, where the method includes:
the second user equipment receives user-level pilot frequency configuration sent by the base station, the user-level pilot frequency configuration comprises silence time-frequency resources, the second user equipment receives pilot signals sent by the first user equipment on the silence time-frequency resources, then the second user equipment measures interference values of the first user equipment to the second user equipment through the pilot signals, and when the interference values of the first user equipment to the second user equipment are lower than an interference threshold value of the second user equipment, the base station determines that target time-frequency resources are time-frequency resources of uplink data of the first user equipment.
In the embodiment of the invention, the second user equipment measures the interference between the user equipment by adopting the existing commercial system pilot frequency condition without adopting an unauthorized frequency spectrum, thereby reducing the measurement complexity.
In some specific embodiments, the method for the second user equipment to measure the interference value of the first user equipment to the second user equipment through the pilot signal is to measure the interference value of the pilot signal, and use the interference value of the pilot signal as the interference value of the first user equipment to the second user equipment.
In some specific embodiments, the method further comprises: the second user equipment measures the self bottom noise value and the interference values of other cells; then the second user equipment measures the interference value of the pilot signal; and subtracting the background noise value from the interference value of the pilot signal, and subtracting the interference values of other cells to obtain the interference value of the first user equipment to the second user equipment.
In a third aspect, an embodiment of the present invention further provides a signal interference measurement apparatus, which specifically implements functions corresponding to the steps executed by the base station in the signal interference measurement method provided in the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software programs by hardware. The hardware and software include one or more unit modules corresponding to the above functions, which may be software and/or hardware.
In one possible design, the signal interference measurement device includes:
a receiving unit, configured to receive an uplink scheduling request of a first user equipment; a time frequency resource selection unit, configured to select a second user equipment according to a downlink channel condition of each user equipment in a cell, where a time frequency resource occupied by downlink of the second user equipment is a target time frequency resource; the pilot setting unit is used for setting user-level pilot configuration of second user equipment, and the user-level pilot configuration of the second user equipment comprises silence time-frequency resources; the control unit is used for controlling the first user equipment to send a pilot signal on the silence time-frequency resource, wherein the pilot signal is used for the second user equipment to measure the interference value of the first user equipment to the second user equipment; and the time frequency resource determining unit is used for determining the target time frequency resource as the time frequency resource of the uplink data of the first user equipment when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment.
In one possible design, the hardware corresponding to the signal interference measurement apparatus is a base station, and the base station includes:
the transmitter, the receiver, the processor and the memory are connected with each other; the memory is used for storing program codes, and the processor calls the program codes in the memory to execute the steps executed by the base station in the signal interference measurement method of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a signal interference measurement apparatus, which specifically implements a function corresponding to a step executed by a second user equipment in the signal interference measurement method provided in the second aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software programs by hardware. The hardware and software include one or more unit modules corresponding to the above functions, which may be software and/or hardware.
In one possible design, the signal interference measurement device includes:
a receiving unit, configured to receive a user-level pilot configuration sent by a base station, where the user-level pilot configuration includes a silence time-frequency resource;
the receiving unit is further configured to receive a pilot signal sent by the first user equipment on the silence time-frequency resource;
and the interference measurement unit is used for measuring an interference value of the first user equipment to the second user equipment through the pilot signal, so that when the interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment.
In one possible design, the hardware corresponding to the signal interference measurement apparatus is a user equipment, and the user equipment includes:
the transmitter, the receiver, the processor and the memory are connected with each other; the memory is used for storing program code, and the processor calls the program code in the memory to execute the steps executed by the second user equipment in the signal interference measurement method of the second aspect.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the embodiment of the invention, a base station receives an uplink scheduling request of first user equipment, and selects second user equipment according to downlink channel conditions of the user equipment in a cell; the base station sets user-level pilot frequency configuration of second user equipment, wherein the pilot frequency configuration comprises silence time-frequency resources; and then, the base station controls the first user equipment to send a pilot signal on the silence time-frequency resource, the second user equipment measures the interference value of the first user equipment to the second user equipment according to the received pilot signal, and when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment, the base station determines that the time-frequency resource occupied by the downlink of the second user equipment can be the time-frequency resource of the uplink data of the first user equipment. Aiming at the problem of interference between user equipment in the current full-duplex networking scene, the embodiment of the invention adopts the existing commercial system pilot frequency condition to measure the interference between the user equipment without adopting an unauthorized frequency spectrum, thereby reducing the measurement complexity.
Drawings
Fig. 1 is a schematic diagram illustrating communication between a UE and an eNB in conventional FDD and TDD scenarios in the prior art;
fig. 2 is a schematic diagram of communication between a UE and an eNB in a full-duplex networking scenario according to an embodiment of the present invention;
fig. 3 is an information exchange flow chart of the signal interference measurement method according to the embodiment of the present invention;
FIG. 4 is a diagram illustrating a pilot pattern design according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating communication among a UE1, a UE2, and an eNB1 during signal interference measurement according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of communications between a UE1, a UE2, a UE3 and an eNB1, an eNB2 during signal interference measurement according to an embodiment of the present invention;
fig. 7 is another flowchart of a signal interference measurement method according to an embodiment of the present invention;
FIG. 8 is a diagram of another pilot pattern design in an embodiment of the present invention;
FIG. 9 is a functional block diagram of a base station according to an embodiment of the present invention;
FIG. 10 is a functional block diagram of a UE according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a hardware structure of a base station and a user equipment in the embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The UE related to the present invention may include a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem with wireless communication function, and various forms of user Equipment, a Mobile Station (MS), a Terminal (Terminal), a Terminal Equipment (Terminal Equipment), and so on. For convenience of description, in this application, it is simply referred to as user equipment or UE.
In the existing communication system, FDD or TDD is generally adopted for communication as shown in fig. 1, so as to avoid interference of a transmitter signal with a receiver signal in a frequency domain or a time domain. In the FDD mode mobile communication system, uplink and downlink communication is performed using different frequencies. In a mobile communication system in TDD mode, reception and transmission are in different time slots of the same frequency channel (i.e., carrier), and the time slots are used to separate the reception and transmission channels. In both communication modes, signals can only communicate within a certain time or a certain specific frequency band.
A Full Duplex wireless communication technology, i.e., a Co-time Co-frequency Full Duplex (CCFD) technology, is a technology different from TDD and FDD, and can realize simultaneous common-frequency communication. Under the full-duplex wireless communication technology, a transmitter and a receiver of the equipment occupy the same frequency resource to work simultaneously, so that two communication parties can use the same frequency at the same time in uplink and downlink, the existing FDD and TDD modes are broken through, and the method is one of the keys of the communication node for realizing bidirectional communication.
The principle of the full-duplex wireless communication technology is as follows:
when two communication devices communicate at the same frequency, the receiving antenna can receive not only the useful signal from the opposite terminal, but also the signal sent by the receiving antenna, namely, the self-interference signal. And since the distance between the transmitting antenna and the receiving antenna is quite close, the strength of the self-interference signal is often much higher than that of the useful signal of the opposite terminal.
The full-duplex technique is a self-interference signal cancellation technique that has been developed to solve the above problems. The rationale is that since the communication device is "aware" of its own transmit signal, it can cancel out this self-interference signal at the receive antenna by some means.
The full-duplex wireless communication technology adopts an interference elimination method to reduce the cost of frequency or time slot resources in the traditional duplex mode, thereby achieving the purpose of improving the frequency spectrum efficiency. Compared with the existing FDD or TDD duplex mode, the same-frequency full duplex technology can improve the use efficiency of wireless resources by nearly one time, thereby obviously improving the throughput and capacity of the system.
The current application scenarios of the full-duplex wireless communication technology mainly include the following categories:
1) full duplex point-to-point communication;
2) full duplex relay;
3) and the full-duplex small base station.
In the full-duplex wireless communication technology, under the condition of multiplexing the same frequency or time resources, the interference between UEs becomes a new problem, and a set of mechanism for measuring the interference between UEs needs to be established to accurately measure the interference between UEs, so that the utilization rate of the full-duplex resources is improved by methods such as scheduling, and the performance of the system is improved.
In an actual scenario, interference between UEs only occurs under the condition of time-frequency resource multiplexing, that is, when different UEs are called by uplink and downlink at the same time, interference may be formed between UEs, and if interference conditions between all UEs are measured, great pressure may be caused to pilot frequency and control resources, so that it is not necessary to measure interference conditions between all UEs, and only interference measurement needs to be performed on the UEs called by full duplex.
The following describes in detail the process of performing interference measurement on signals between UEs in the embodiment of the present invention with reference to fig. 3:
301. a base station receives an uplink scheduling request of first user equipment;
when the first user equipment (UE1) needs uplink data, an uplink scheduling request is sent to the base station to request the base station to allocate uplink scheduling resources. The base station receives the uplink scheduling request sent by the UE 1.
302. The base station selects a second user equipment according to the downlink channel condition of each user equipment in the cell;
in a scenario of adopting simultaneous co-frequency full duplex communication, after receiving an uplink scheduling request sent by the UE1, the base station selects a suitable downlink time-frequency resource of a second user equipment (UE2) to allocate to the UE1 according to downlink channel conditions of UEs in the cell.
However, generally, uplink transmission from the UE may cause interference to other UEs, so if the UE1 uses the same time-frequency resource as the UE2 for uplink transmission, it is necessary to measure the interference from the UE1 to the UE 2.
Specifically, the base station selects the UE2 according to the downlink channel condition of each UE in the cell by obtaining, by the base station, a Signal-to-Noise Ratio (SNR) of the downlink channel of each UE in the cell, and selecting the UE with the highest SNR from the SNRs of the downlink channels of each UE.
In an optional scenario of adopting simultaneous co-frequency full duplex communication, when cell resources are insufficient and full duplex communication needs to be adopted, the base station selects appropriate downlink time-frequency resources of the UE to allocate to the UE1 according to downlink channel conditions of each UE in the cell. Specifically, for example:
if there is idle time frequency resource in the base station, the idle time frequency resource is allocated to the UE1, and the UE1 is scheduled on the idle time frequency resource. If the uplink time-frequency resources in the base station are fully adjusted and no idle time-frequency resources are allocated to the UE1, selecting a second user equipment (UE2) with better channel conditions according to the downlink channel conditions of each user equipment in the cell.
303. The base station sets user-level pilot frequency configuration of second user equipment;
the most common method for performing interference measurement is a pilot-assisted channel estimation algorithm, that is, a pilot signal is used to sample different points of a channel in a time-frequency space, and then a frequency response value of the whole channel is obtained through interpolation filtering to complete channel estimation.
The base station is required to set the user-level pilot of the user equipment before using the pilot signal for interference measurement. In the embodiment of the invention, the base station sets the user-level pilot configuration of the UE2, and the user-level pilot configuration of the UE2 comprises silent time-frequency resources.
A specific pilot pattern design may be as shown in fig. 4. A special flow for inter-UE interference measurement is added on the basis of Cell-specific RS (CSI-RS).
In the two Resource Blocks (RBs) shown in fig. 4, Resource Elements (REs) shown in 401 are cell-specific pilots, and REs shown in 402 are user-level pilots of the UE 2. RE of the user-level pilot shown in 402 is processed in a Zero Padding (ZP) manner, that is, RE of the user-level pilot shown in 402 is a silent time-frequency resource and does not carry data.
After setting the user-level pilot configuration of the UE2, the base station sends the pilot configuration to the UE 2.
304. The base station controls the first user equipment to send pilot signals on the silence time-frequency resource, and the second user equipment receives the pilot signals sent by the first user equipment on the silence time-frequency resource;
the base station controls the UE1 to send pilot signals on the silence time-frequency resource set for the UE2, because the UE2 is silent on the silence time-frequency resource, the base station will not send signals to the UE2, and therefore the UE2 will receive the pilot signals sent by the UE1 on the silence time-frequency resource.
In practical applications, the UE1 may be controlled to transmit pilot signals in time-frequency resources (target time-frequency resources) occupied by downlink of the UE2 or in time-frequency covering silent time-frequency resources. As shown in fig. 5, UE2 occupies f1 to receive downlink data, and UE1 occupies f1 to transmit uplink data, at this time, UE2 receives uplink data transmitted by UE1 in the silence time-frequency resource configured by pilots.
305. The second user equipment measures the interference value of the first user equipment to the second user equipment through the pilot signal;
the UE2 measures an interference value of the UE1 to the UE2 through the pilot signal after receiving the pilot signal transmitted by the UE 1. The measured interference value is specifically a signal-to-noise ratio, and the interference threshold value of each user terminal is different according to different modulation orders during modulation.
306. And when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment.
After measuring the interference value of the UE1 to the UE2 through the pilot signal, the UE2 determines whether the interference value is lower than the interference threshold of the UE2 itself, and sends the determination result to the base station.
Optionally, after the UE2 measures the interference value of the UE1 to the UE2 through the pilot signal, the UE2 may also send the interference value to the base station, and the base station determines whether the interference value is lower than the interference threshold value of the UE 2.
When the interference value of the UE1 to the UE2 is lower than the interference threshold value of the UE2, it indicates that when the UE1 multiplexes the downlink time-frequency resources of the UE2 in uplink, the interference to the UE2 is not caused, or the caused interference is within an acceptable range. The base station may allocate time-frequency resources (target time-frequency resources) occupied by the UE2 downlink to the UE1, and the UE1 multiplexes the downlink time-frequency resources of the UE2 in uplink, that is, the base station uplink and downlink simultaneously call the UE1 and the UE2 at the same frequency.
When the interference value of the UE1 to the UE2 is not lower than the interference threshold value of the UE2, it indicates that the interference to the UE2 is caused or the interference is out of the acceptable range when the UE1 multiplexes the downlink time-frequency resources of the UE2 in the uplink. The base station may not allocate the time-frequency resource (target time-frequency resource) occupied by the UE2 downlink to the UE1, and needs to re-step 302 to step 306 to select other suitable UEs for interference measurement.
If the UE1 is located at the edge of the cell, when the base station determines that the interference value of the UE1 to the UE2 is lower than the interference threshold value of the UE2, it is also required to measure that the time-frequency resource (target time-frequency resource) when the UE1 uses the downlink of the UE2 will not cause interference to the UE occupying the target time-frequency resource in the neighboring cell for downlink.
As shown in fig. 6, UE1 is located at the cell edge of eNB1, adjacent to the cell in which eNB2 is located. The eNB1 sends the target time-frequency resource to the base station of the cell adjacent to the UE1, i.e. the adjacent base station eNB2, and the eNB2 determines the third user equipment (UE3) that occupies the target time-frequency resource for downlink. The eNB2 sets the pilot configuration of the UE3, and the setting method may be the same as the method in which the base station sets the pilot configuration of the UE2 in step 303. After that, the UE3 performs interference measurement after receiving the pilot signal transmitted by the UE1, and the eNB2 transmits the interference measurement result to the eNB 1. If the interference value of the UE1 to the UE3 is lower than the interference threshold value of the UE3, the eNB1 determines a target time-frequency resource, that is, the time-frequency resource occupied by the UE2 in the downlink may be used as the time-frequency resource of the uplink data of the UE 1.
When full duplex communication is adopted, the embodiment of the invention enables the UE1 and the UE2 to occupy the same resource for up-down communication, improves the frequency spectrum utilization rate and the system capacity, and simultaneously avoids the interference among users.
In addition, the embodiment of the invention aims at the problem of the interference between the UE under the current full duplex networking scene, the existing commercial system pilot frequency condition is adopted to measure the interference between the UE, and only other UE on the time frequency resource occupied by the UE1 needs to be subjected to interference measurement, so that the measurement complexity and the resource overhead are reduced.
In addition, if the UE is located at the edge of the cell, the interference between the UE and the user of the neighboring cell is measured, so that the interference between the UE and the user of the neighboring cell can be avoided, and the realizability of the scheme is improved.
Further, in order to measure the interference of the UE1 more accurately, the UE2 may measure the interference value of the other cell and the self-floor noise for the first time, and then subtract the self-floor noise from the interference value measured in step 305 and the measured interference value of the other cell, so as to obtain a more accurate interference value of the UE1 on the UE 2.
Similarly, if UE1 is located at the cell edge, UE3 also performs two measurements when measuring the interference value of UE1 to UE 3. The UE3 first measures the interference value of the other cell and the self bottom noise, subtracts the self bottom noise from the measured interference value of the UE1 to the UE3, and subtracts the measured interference value of the other cell, so as to obtain a more accurate interference value of the UE1 to the UE 3.
The specific flow of the signal interference measurement in the embodiment of the present invention is shown in fig. 7.
Firstly, the UE1 has an uplink scheduling request, the base station judges whether the uplink time-frequency resource is fully adjusted, if not, the base station schedules the UE1 on the idle time-frequency resource. If the scheduling is full, the downlink UE with better channel conditions is selected 2.
If the time-frequency resource of the UE2 is selected as the uplink transmission time-frequency of the UE1, the UE2 measures the inter-UE interference. The base station sets the user-level pilot configuration of UE2, and the base station, when transmitting data, serves cell muting at the pilot location set by UE 2. The base station informs the UE1 to send pilot signals on the same time-frequency resource of the UE2, and the UE2 receives the pilot signals transmitted by the UE 1.
The UE2 performs interference measurement, and when the measurement result of the UE2 shows that the interference value of the UE1 to the UE2 is not lower than the interference threshold value of the UE2, it indicates that the UE1 seriously affects the normal communication of the UE2, and then the UE1 only selects time-frequency resources of other UEs to perform interference test until it is found that the interference of a certain UE by the UE1 is lower than the threshold value.
When the UE2 measurement result shows that the interference value of the UE1 to the UE2 is smaller than the threshold value, it indicates that the UE1 does not have a great influence on the normal communication of the UE 2. Then, it is determined whether the UE1 is a UE at the cell edge, and if not, the UE2 time-frequency resource may be an uplink transmission time-frequency resource of the UE 1.
If the UE1 is a UE at the edge of a cell, the UE3 on the same time-frequency resource of the neighboring cell is also required to measure the interference of the UE1, and observe whether the neighboring cell UE3 is subject to the co-channel interference of the UE 1.
Specifically, the base station of the neighboring cell determines that the UE3, UE3 in conjunction with UE1, is using the time-frequency resources of UE2 to configure user-level pilots. The pilot configuration can be as shown in fig. 8, where cell 1 is the cell where UE1 and UE2 are located, the pilot configuration of UE2 is as shown in the left figure, and 801 is the silent RE of UE 2; cell 2 is the cell where UE3 is located, the pilot configuration of UE3 is as shown in the right figure, and 802 is the muted REs of UE 3. The base station of the neighboring cell notifies the base station of the cell where the UE1 is located, notifies the UE1 to transmit a pilot signal, receives the pilot signal by the UE3, and measures an interference value of the UE1 to the UE 3.
When the measurement result of the UE3 shows that the interference value of the UE1 to the UE3 is not lower than the interference threshold value of the UE3, it indicates that the UE1 seriously affects the normal communication of the UE3, and the UE1 only continues to select the time-frequency resources of other UEs for performing the interference test.
When the measurement result of the UE3 shows that the interference value of the UE1 to the UE3 is smaller than the threshold value, it indicates that the UE1 does not have a large influence on the normal communication of the UE3, and it is determined that the UE1 can transmit signals uplink on the same time-frequency resource of the UE 2.
The foregoing is a description of a signal interference measurement method in the embodiment of the present invention, and a signal interference measurement apparatus in the embodiment of the present invention is described below from the perspective of a functional module.
As shown in fig. 9, the signal interference measuring apparatus in the embodiment of the present invention includes:
a receiving unit 901, configured to receive an uplink scheduling request of a first user equipment;
a time-frequency resource selecting unit 902, configured to select a second user equipment according to a downlink channel condition of each user equipment in a cell, where a time-frequency resource occupied by downlink of the second user equipment is a target time-frequency resource;
a pilot setting unit 903, configured to set user-level pilot configuration of the second user equipment, where the user-level pilot configuration of the second user equipment includes silence time-frequency resources;
a control unit 904, configured to control a first user equipment to send a pilot signal on a silence time-frequency resource, where the pilot signal is used by a second user equipment to measure an interference value of the first user equipment to the second user equipment;
a time-frequency resource determining unit 905, configured to determine that the target time-frequency resource is a time-frequency resource of uplink data of the first user equipment when an interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment.
In some specific embodiments, the time-frequency resource selecting unit 902 is specifically configured to select, when the scheduling of the uplink time-frequency resource is full, a second user equipment according to a downlink channel condition of each user equipment in the cell, where the time-frequency resource occupied by the downlink of the second user equipment is a target time-frequency resource.
In some specific embodiments, the time-frequency resource selecting unit 902 is specifically configured to obtain a signal-to-noise ratio of a downlink channel of each user equipment in the cell, and determine, from the signal-to-noise ratios of the downlink channels of the user equipments, a second user equipment with a highest signal-to-noise ratio, where a time-frequency resource occupied by downlink of the second user equipment is a target time-frequency resource.
In some specific embodiments, the apparatus further comprises: a sending unit 906, configured to send the target time-frequency resource to an adjacent base station when the first user equipment is located at a cell edge and an interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, so that the adjacent base station determines a third user equipment that occupies the target time-frequency resource for downlink, where the adjacent base station is a base station of a cell adjacent to the first user equipment; the time-frequency resource determining unit 905 is specifically configured to determine that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment, when an interference value of the first user equipment to the third user equipment is lower than an interference threshold value of the third user equipment.
In some specific embodiments, the interference value of the first user equipment to the second user equipment is an interference value of a pilot signal measured by the second user equipment.
In some specific embodiments, the control unit 904 is further configured to control the second user equipment to measure its own noise floor and interference values of other cells before controlling the first user equipment to transmit the pilot signal in the target time-frequency resource; the interference value of the first user equipment to the second user equipment is the difference between the interference value of the pilot signal measured by the second user equipment and the interference values of the background noise and other cells.
The signal interference measurement apparatus shown in fig. 9 specifically implements functions corresponding to the steps executed by the base station in the method embodiments shown in fig. 3 to 8, and please refer to the method embodiments shown in fig. 3 to 8 for interaction between the units, which is not described herein again.
As shown in fig. 10, the signal interference measuring apparatus in the embodiment of the present invention includes:
a receiving unit 1001, configured to receive a user-level pilot configuration sent by a base station, where the user-level pilot configuration includes a silence time-frequency resource;
a receiving unit 1001, configured to receive a pilot signal sent by a first user equipment on a silence time-frequency resource;
an interference measuring unit 1002, configured to measure an interference value of the first user equipment to the second user equipment through the pilot signal, so that when the interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is a time-frequency resource of uplink data of the first user equipment.
In some specific embodiments, the interference measurement unit 1002 is specifically configured to measure an interference value of a pilot signal, where the interference value of the pilot signal is an interference value of the first user equipment to the second user equipment.
In some specific embodiments, the interference measurement unit 1002 is specifically configured to measure a base noise value of itself and interference values of other cells, measure an interference value of a pilot signal, subtract the base noise value from the interference value of the pilot signal, and subtract the interference values of the other cells to obtain an interference value of the first user equipment to the second user equipment.
The signal interference measurement apparatus shown in fig. 10 specifically implements functions corresponding to the steps executed by the second user equipment in the method embodiments shown in fig. 3 to fig. 8, and please refer to the method embodiments shown in fig. 3 to fig. 8 for interaction among the units, which is not described herein again.
In addition, the present application also includes a signal interference measurement system, where the system includes a base station and a user equipment, and the user equipment and the base station in the system in the implementation of the present invention respectively have the functions of the base station and the user equipment in the above method embodiments (the embodiments shown in fig. 3 to fig. 8).
The base station provides radio access for user equipment to a network and comprises one or more processors, one or more memories, one or more network interfaces, and one or more transceivers (each comprising a receiver Rx and a transmitter Tx), connected by a bus. One or more transceivers are connected to an antenna or antenna array. The one or more processors include computer program code. The network interface is connected to the core network via a link, e.g. a link to the core network, or to other base stations via a wired or wireless link. The processor executes a series of computer program code instructions in the memory to perform, in particular, all or part of the steps performed by the base station in the above-described method embodiments (the embodiments shown in fig. 3 to 8).
The user equipment communicates wirelessly with the base station over a link. The user equipment comprises one or more processors, one or more memories, one or more transceivers (each comprising a transmitter Tx and a receiver Rx), connected by a bus. One or more transceivers are connected to one or more antennas. The one or more memories include computer program code, and the processor executes a series of computer program code instructions in the memory to perform operations, in particular, all or part of the steps performed by the user equipment in the above-described method embodiments (the embodiments shown in fig. 3 to 8).
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (18)
1. A signal interference measurement method, the method comprising:
a base station receives an uplink scheduling request of first user equipment;
the base station selects a second user equipment according to the downlink channel condition of each user equipment in the cell, wherein the time frequency resource occupied by the downlink of the second user equipment is a target time frequency resource;
the base station sets user-level pilot frequency configuration of the second user equipment, wherein the user-level pilot frequency configuration of the second user equipment comprises silence time-frequency resources;
the base station controls the first user equipment to send a pilot signal on the silence time-frequency resource, wherein the pilot signal is used for the second user equipment to measure an interference value of the first user equipment to the second user equipment;
and when the interference value of the first user equipment to the second user equipment is lower than the interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment.
2. The method of claim 1, wherein the base station selecting the second ue according to the downlink channel condition of each ue in the cell comprises:
and when the scheduling of the uplink time-frequency resource of the base station is full, the base station selects the second user equipment according to the downlink channel condition of each user equipment in the cell.
3. The method of claim 1, wherein the base station selecting the second ue according to the downlink channel condition of each ue in the cell comprises:
the base station acquires the signal-to-noise ratio of the downlink channel of each user equipment in the cell, and determines the second user equipment with the highest signal-to-noise ratio from the signal-to-noise ratio of the downlink channel of each user equipment.
4. The method of claim 1, wherein if the first ue is located at a cell edge, when an interference value of the first ue to the second ue is lower than an interference threshold of the second ue, the method further comprises:
the base station sends the target time-frequency resource to an adjacent base station so that the adjacent base station determines a third user equipment occupying the target time-frequency resource for downlink, wherein the adjacent base station is a base station of a cell adjacent to the first user equipment;
the determining that the target time frequency resource is the time frequency resource of the uplink data of the first user equipment includes:
and if the interference value of the first user equipment to the third user equipment is lower than the interference threshold value of the third user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of the uplink data of the first user equipment.
5. The method according to any one of claims 1 to 4,
and the interference value of the first user equipment to the second user equipment is the interference value of the pilot signal measured by the second user equipment.
6. The method according to any of claims 1 to 4, wherein before the base station controlling the first user equipment to transmit pilot signals on the target time-frequency resource, the method further comprises:
the base station controls the second user equipment to measure the self bottom noise value and the interference values of other cells;
and the interference value of the first user equipment to the second user equipment is the difference between the interference value of the pilot signal measured by the second user equipment and the interference values of the background noise and other cells.
7. A signal interference measurement method, the method comprising:
a second user equipment receives user-level pilot frequency configuration sent by a base station, wherein the user-level pilot frequency configuration comprises silence time-frequency resources; the second user equipment is selected by the base station according to the downlink channel condition of each user equipment in the cell, and the time frequency resource occupied by the downlink of the second user equipment is a target time frequency resource;
the second user equipment receives a pilot signal sent by the first user equipment on the silence time-frequency resource;
and the second user equipment measures an interference value of the first user equipment to the second user equipment through the pilot signal, so that when the interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is the time-frequency resource of uplink data of the first user equipment.
8. The method of claim 7, wherein the second user equipment measuring the interference value of the first user equipment to the second user equipment through the pilot signal comprises:
and the second user equipment measures the interference value of the pilot signal, wherein the interference value of the pilot signal is the interference value of the first user equipment to the second user equipment.
9. The method of claim 7, further comprising:
the second user equipment measures the self bottom noise value and the interference values of other cells;
the second user equipment measuring the interference value of the first user equipment to the second user equipment through the pilot signal comprises the following steps:
the second user equipment measures the interference value of the pilot signal;
and the second user equipment subtracts the background noise value from the interference value of the pilot signal and subtracts the interference values of other cells to obtain the interference value of the first user equipment to the second user equipment.
10. A signal interference measurement apparatus, characterized in that the apparatus comprises:
a receiving unit, configured to receive an uplink scheduling request of a first user equipment;
a time-frequency resource selection unit, configured to select a second user equipment according to a downlink channel condition of each user equipment in a cell, where a time-frequency resource occupied by downlink of the second user equipment is a target time-frequency resource;
a pilot setting unit, configured to set a user-level pilot configuration of the second user equipment, where the user-level pilot configuration of the second user equipment includes a silence time-frequency resource;
a control unit, configured to control the first user equipment to send a pilot signal on the silence time-frequency resource, where the pilot signal is used for the second user equipment to measure an interference value of the first user equipment to the second user equipment;
and a time-frequency resource determining unit, configured to determine that the target time-frequency resource is a time-frequency resource of uplink data of the first user equipment when an interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment.
11. The apparatus of claim 10,
and the time-frequency resource selection unit is specifically configured to select the second user equipment according to the downlink channel condition of each user equipment in the cell when the scheduling of the uplink time-frequency resource is full, where the time-frequency resource occupied by the downlink of the second user equipment is a target time-frequency resource.
12. The apparatus of claim 10,
and the time-frequency resource selection unit is specifically configured to acquire a signal-to-noise ratio of a downlink channel of each user equipment in the cell, and determine the second user equipment with the highest signal-to-noise ratio from the signal-to-noise ratios of the downlink channels of the user equipments, where the time-frequency resource occupied by the downlink of the second user equipment is a target time-frequency resource.
13. The apparatus of claim 10, further comprising:
a sending unit, configured to send the target time-frequency resource to an adjacent base station when the first user equipment is located at a cell edge and an interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, so that the adjacent base station determines a third user equipment that occupies the target time-frequency resource for downlink, where the adjacent base station is a base station of a cell adjacent to the first user equipment;
the time-frequency resource determining unit is specifically configured to determine that the target time-frequency resource is a time-frequency resource of uplink data of the first user equipment, when an interference value of the first user equipment to the third user equipment is lower than an interference threshold value of the third user equipment.
14. The apparatus according to any one of claims 10 to 13,
and the interference value of the first user equipment to the second user equipment is the interference value of the pilot signal measured by the second user equipment.
15. The apparatus according to any one of claims 10 to 13,
the control unit is further configured to control the second user equipment to measure a noise floor value of the second user equipment and an interference value of another cell before controlling the first user equipment to send a pilot signal in the target time-frequency resource;
and the interference value of the first user equipment to the second user equipment is the difference between the interference value of the pilot signal measured by the second user equipment and the interference values of the background noise and other cells.
16. A signal interference measurement apparatus, characterized in that the apparatus comprises:
a receiving unit, configured to receive a user-level pilot configuration sent by a base station, where the user-level pilot configuration includes a silence time-frequency resource; the base station is used for selecting second user equipment according to the downlink channel condition of each user equipment in the cell, and the time frequency resource occupied by the downlink of the second user equipment is a target time frequency resource;
the receiving unit is further configured to receive a pilot signal sent by the first user equipment on the silence time-frequency resource;
an interference measurement unit, configured to measure, through the pilot signal, an interference value of the first user equipment to the second user equipment, so that when the interference value of the first user equipment to the second user equipment is lower than an interference threshold value of the second user equipment, the base station determines that the target time-frequency resource is a time-frequency resource of uplink data of the first user equipment.
17. The apparatus of claim 16,
the interference measurement unit is specifically configured to measure an interference value of the pilot signal, where the interference value of the pilot signal is an interference value of the first user equipment to the second user equipment.
18. The apparatus of claim 16,
the interference measurement unit is specifically configured to measure a base noise value of the interference measurement unit and interference values of other cells, measure an interference value of the pilot signal, subtract the base noise value from the interference value of the pilot signal, and subtract the interference values of the other cells to obtain an interference value of the first user equipment to the second user equipment.
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| CN108322242A (en) * | 2017-12-29 | 2018-07-24 | 上海华为技术有限公司 | A kind of interference control method, device, user equipment, base station and system |
| CN112369092A (en) * | 2018-05-10 | 2021-02-12 | 株式会社Ntt都科摩 | Radio base station and user terminal |
| CN115955283A (en) * | 2022-12-23 | 2023-04-11 | 中国联合网络通信集团有限公司 | Uplink interference measuring method and device and readable storage medium |
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| CN104105120A (en) * | 2013-04-08 | 2014-10-15 | 中兴通讯股份有限公司 | Interference measuring method, network side equipment and terminal equipment |
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