WO2014206262A1 - 避免d2d传输造成上行干扰的方法、基站和用户设备 - Google Patents
避免d2d传输造成上行干扰的方法、基站和用户设备 Download PDFInfo
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- WO2014206262A1 WO2014206262A1 PCT/CN2014/080557 CN2014080557W WO2014206262A1 WO 2014206262 A1 WO2014206262 A1 WO 2014206262A1 CN 2014080557 W CN2014080557 W CN 2014080557W WO 2014206262 A1 WO2014206262 A1 WO 2014206262A1
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- user equipment
- uplink pilot
- transmission
- base station
- pilot signal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
Definitions
- the present invention relates to the field of wireless communications, and more particularly to a method, base station and user equipment for avoiding uplink interference caused by D2D transmission. Background technique
- D2D Device-to-Device communication
- UE User Equipment
- UE User Equipment
- the uplink transmission of the D2D transmission and the normal cellular system will coexist, which may cause mutual interference. It is intolerable that the uplink transmission of a normal cellular system may be interfered by D2D transmission, resulting in a decrease in transmission quality, especially when the device performing D2D transmission is close to the base station, which may cause huge uplink interference.
- the embodiment of the invention provides a method for avoiding uplink interference caused by D2D transmission, a base station and a user equipment, which can solve the interference of the D2D transmission on the uplink signal of the ordinary user equipment.
- a method for avoiding uplink interference caused by D2D transmission where: the base station sends uplink pilot resource configuration information to a first user equipment; and the base station receives the first user equipment according to the uplink pilot An uplink pilot signal that is configured and sent by the resource configuration information; the base station determines power control information according to the received strength of the uplink pilot signal, where a received strength of the signal of the uplink pilot signal indicates the first user equipment and Second user equipment performs device to device
- the D2D transmits interference to the uplink transmission between the third user equipment and the base station; the base station sends the power control information to the first user equipment.
- the uplink pilot resource configuration information includes at least one of the following: a time-frequency resource occupied by the uplink pilot signal, and a pilot sequence of the uplink pilot signal The transmit power of the uplink pilot signal.
- the determining the power control information according to the signal receiving strength of the uplink pilot signal includes: receiving a signal strength according to the uplink pilot signal Determining, by the transmit power of the uplink pilot signal, a path loss between the first user equipment and the base station; determining, according to the path loss and a preset interference tolerance threshold, a maximum D2D transmission performed by the first user equipment Transmit power, wherein the interference tolerance threshold is a maximum received power that the base station can tolerate receiving the D2D transmission.
- the sending the power control information to the first user equipment includes: sending the maximum transmit power to the first user equipment, The transmit power of the first user equipment to perform D2D transmission is made smaller than the maximum transmit power.
- the determining the power control information according to the signal receiving strength of the uplink pilot signal includes: receiving a signal strength according to the uplink pilot signal And determining, by the preset interference tolerance threshold, whether the D2D transmission causes uplink interference to the third user equipment, where the interference tolerance threshold is a maximum received power that the base station can tolerate receiving the D2D transmission; And determining, when the signal receiving strength of the uplink pilot signal is greater than or equal to the interference tolerance threshold, determining a reduction amount of the transmit power of the first user equipment to perform D2D transmission.
- the sending the power control information to the first user equipment includes: transmitting, to the first user equipment, the transmission of the D2D transmission The amount of power reduction is such that the transmit power of the first user equipment performing D2D transmission is reduced below the interference tolerance threshold.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the second aspect provides a method for avoiding uplink interference caused by D2D transmission, including: receiving, by the first user equipment, uplink pilot resource configuration information sent by the base station; and configuring, by the first user equipment, the uplink pilot resource configuration information And transmitting an uplink pilot signal, so that the base station is configured according to The received strength of the uplink pilot signal determines power control information, where the received strength of the signal of the uplink pilot signal indicates that the first user equipment and the second user equipment perform device-to-device
- the D2D transmits interference to the uplink transmission between the third user equipment and the base station; the first user equipment receives the power control information sent by the base station.
- the uplink pilot resource configuration information includes at least one of the following: a time-frequency resource occupied by the uplink pilot signal, and a pilot sequence of the uplink pilot signal The transmit power of the uplink pilot signal.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- a base station including: a first sending unit, configured to send uplink pilot resource configuration information to a first user equipment; and a receiving unit, configured to receive the first user equipment according to the uplink And determining, by the frequency resource configuration information, an uplink pilot signal, where the determining unit is configured to determine, according to the received strength of the uplink pilot signal, the power control information, where the received strength of the signal of the uplink pilot signal indicates the first
- the user equipment and the second user equipment perform interference caused by the device-to-device D2D transmission to the uplink transmission between the third user equipment and the base station; the second sending unit is configured to send the power control information to the first user equipment.
- the uplink pilot resource configuration information that is sent by the first sending unit includes at least one of the following: a time-frequency resource occupied by the uplink pilot signal; a pilot sequence of the frequency signal; a transmission power of the uplink pilot signal.
- the determining unit is specifically configured to: determine, according to a signal receiving strength of the uplink pilot signal and a transmit power of the uplink pilot signal, a path loss between the first user equipment and the base station; determining, according to the path loss and a preset interference tolerance threshold, a maximum transmit power of the first user equipment to perform D2D transmission, where the interference tolerance threshold is The base station can tolerate receiving the maximum received power of the D2D transmission.
- the second sending unit is specifically configured to: send the maximum transmit power to the first user equipment, so that the first user equipment The transmit power for performing D2D transmission is less than the maximum transmit power.
- the determining unit is specifically configured to: determine the D2D according to a signal receiving strength of the uplink pilot signal and a preset interference tolerance threshold. Whether the transmission causes uplink interference to the third user equipment, where the The interference tolerance threshold is a maximum received power that the base station can tolerate receiving the D2D transmission; and when the signal reception strength of the uplink pilot signal is greater than or equal to the interference tolerance threshold, determining that the first user equipment performs The amount of reduction in transmit power of D2D transmission.
- the second sending unit is specifically configured to: send, to the first user equipment, a reduction amount of the transmit power of the D2D transmission, so that The transmit power of the first user equipment performing D2D transmission is reduced below the interference tolerance threshold.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- a user equipment including: a first receiving unit, configured to receive uplink pilot resource configuration information sent by a base station; and a configuration unit, configured to configure an uplink pilot signal according to the uplink pilot resource configuration information a sending unit, configured to send an uplink pilot signal configured by the configuration unit, so that the base station determines power control information according to a received strength of the uplink pilot signal, where a received strength of the uplink pilot signal is received.
- a first receiving unit configured to receive uplink pilot resource configuration information sent by a base station
- a configuration unit configured to configure an uplink pilot signal according to the uplink pilot resource configuration information
- a sending unit configured to send an uplink pilot signal configured by the configuration unit, so that the base station determines power control information according to a received strength of the uplink pilot signal, where a received strength of the uplink pilot signal is received.
- the uplink pilot resource configuration information includes at least one of the following: a time-frequency resource occupied by the uplink pilot signal, and a pilot sequence of the uplink pilot signal The transmit power of the uplink pilot signal.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the base station determines the power control information according to the received strength of the uplink pilot signal, so as to control the first user equipment to perform the D2D transmission power, thereby solving the interference of the D2D transmission on the uplink signal of the common user equipment.
- FIG. 1 is a flow chart of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- 2 is a flow chart of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- FIG. 3 is an interaction diagram of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- 4 is an interaction diagram of a method for avoiding uplink interference caused by D2D transmission according to another embodiment of the present invention.
- Figure 5 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
- Figure 6 is a schematic block diagram of a user equipment in accordance with one embodiment of the present invention.
- FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention.
- FIG. 8 is a schematic block diagram of a user equipment according to another embodiment of the present invention. detailed description
- GSM Global System of Mobile Communication
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- a user equipment which may also be called a mobile terminal (Mobile Terminal), a mobile user equipment, etc., may communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network).
- the user equipment may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a mobile device that can be portable, pocket, handheld, computer built, or in-vehicle,
- the wireless access network exchanges languages and/or data.
- the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station (eNB or e-NodeB, evolutional Node B) in LTE.
- BTS Base Transceiver Station
- NodeB base station
- eNB evolved base station
- e-NodeB evolutional Node B
- FIG. 1 is a flow chart of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- the method of Figure 1 is performed by a base station.
- the base station sends uplink pilot resource configuration information to the first user equipment.
- the base station receives, by the first user equipment, the configuration and sending according to the uplink pilot resource configuration information. Uplink pilot signal.
- the base station determines, according to the received strength of the uplink pilot signal, the power control information, where the received strength of the signal of the uplink pilot signal indicates that the first user equipment and the second user equipment perform device-to-device D2D transmission between the third user equipment and the base station.
- the interference caused by the uplink transmission is not limited to the received strength of the uplink pilot signal, the power control information, where the received strength of the signal of the uplink pilot signal indicates that the first user equipment and the second user equipment perform device-to-device D2D transmission between the third user equipment and the base station.
- the base station sends power control information to the first user equipment.
- the base station determines the power control information according to the received strength of the uplink pilot signal, so as to control the first user equipment to perform the D2D transmission power, thereby solving the interference of the D2D transmission on the uplink signal of the common user equipment.
- the uplink pilot resource configuration information may include at least one of the following: a time-frequency resource occupied by the uplink pilot signal; a pilot sequence of the uplink pilot signal; and a transmit power of the uplink pilot signal.
- the uplink pilot resource configuration information may be pre-configured by the base station, and is used to indicate that the first user equipment sends the uplink pilot signal with a specific transmit power by using a specific pilot sequence on a specific time-frequency resource.
- the foregoing step 103 may include: determining, according to a signal receiving strength of the uplink pilot signal and a transmit power of the uplink pilot signal, a path loss between the first user equipment and the base station;
- the preset interference tolerance threshold determines a maximum transmit power of the first user equipment to perform D2D transmission, wherein the interference tolerance threshold is a maximum received power that the base station can tolerate receiving the D2D transmission.
- the transmit power of the uplink pilot signal is pre-configured by the base station by using uplink pilot resource configuration information, and the transmit power may be the same as or different from the transmit power of the actual D2D data transmission, when the transmit power is transmitted with the actual D2D data.
- the transmission power is different, or is not known to be the same, for example, when the sounding reference signal SRS is used as the uplink pilot signal
- the path loss between the first user equipment and the base station may be estimated according to the received power of the uplink pilot signal, and Further, the maximum transmit power of the D2D transmission is determined according to the interference threshold.
- the step 104 may include: sending, to the first user equipment, a maximum transmit power, such that the transmit power of the first user equipment performing the D2D transmission is less than the maximum transmit power.
- the step 103 may further include: determining, according to the signal receiving strength of the uplink pilot signal and the preset interference tolerance threshold, whether the D2D transmission causes uplink interference to the third user equipment, where the interference is tolerated.
- the threshold is the maximum received power of the received D2D transmission that the base station can tolerate; when the received signal strength of the uplink pilot signal is greater than or equal to the interference tolerance threshold At the time, the amount of decrease in the transmit power of the D2D transmission performed by the first user equipment is determined.
- the transmit power of the uplink pilot signal is substantially the same as the transmit power of the actual D2D data transmission, for example, when the demodulation reference signal DMRS is used as the uplink pilot signal, the received strength of the uplink pilot signal may be directly used as the uplink pilot signal.
- the interference strength of the D2D transmission to the uplink signal of the ordinary user equipment may be directly used as the uplink pilot signal.
- the amount of reduction of the transmit power of the first user equipment to perform D2D transmission may be determined by a preset formula of the system, or may be performed by adding a system to a portion of the uplink pilot signal whose signal reception strength exceeds the interference tolerance threshold.
- the preset value is used as the amount of reduction in the transmission power of the D2D transmission.
- step 104 may further include: sending, to the first user equipment
- the amount of decrease in transmit power of the D2D transmission is such that the transmit power of the first user equipment performing the D2D transmission is reduced below the dry threshold.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the base station measures the uplink pilot signal to estimate the interference caused by the D2D transmission to the uplink transmission of the normal user equipment, and sends the power upper limit or the transmit power reduction command of the D2D transmission to the user performing the D2D transmission by the base station.
- the device in order to limit the interference of the D2D transmission to the uplink signal of the ordinary user equipment, thereby controlling the interference caused by the D2D transmission to an acceptable range.
- FIG. 2 is a flow chart of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- the method of Figure 2 is performed by a first user equipment UE1.
- the first user equipment receives uplink pilot resource configuration information sent by the base station.
- the first user equipment configures and sends an uplink pilot signal according to the uplink pilot resource configuration information, so that the base station determines the power control information according to the received strength of the uplink pilot signal, where the received strength of the signal of the uplink pilot signal indicates the first
- the user equipment and the second user equipment perform interference caused by the device-to-device D2D transmission to the uplink transmission between the third user equipment and the base station.
- the first user equipment receives power control information sent by the base station.
- the base station determines the power control information according to the received strength of the uplink pilot signal, so as to control the first user equipment to perform the D2D transmission power, thereby solving the interference of the D2D transmission on the uplink signal of the common user equipment.
- the uplink pilot resource configuration information may include at least one of the following: Species: time-frequency resources occupied by uplink pilot signals; pilot sequences of uplink pilot signals; transmit power of uplink pilot signals.
- the uplink pilot resource configuration information may be pre-configured by the base station, and is used to indicate that the first user equipment sends the uplink pilot signal by using a specific pilot sequence on a specific time-frequency resource with a specific transmit power.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the first user equipment receives power control information sent by the base station, and performs transmit power adjustment of the D2D transmission according to the power control information.
- the power control information includes the maximum transmit power of the D2D transmission determined by the base station
- the first user equipment ensures that the transmit power of the D2D transmission is less than the maximum transmit power.
- the power control information includes the amount of decrease in the transmit power of the D2D transmission
- the first user equipment adjusts the current D2D transmission transmit power according to the decrease amount.
- the base station measures the uplink pilot signal to estimate the interference caused by the uplink transmission of the D2D transmission to the normal user equipment, and the D2D is transmitted by the base station to the D2D transmission power upper limit or the ordinary user equipment uplink signal interference.
- the interference control caused by the transmission is within an acceptable range.
- FIG. 3 is an interaction diagram of a method for avoiding uplink interference caused by D2D transmission according to an embodiment of the present invention.
- the interaction diagram of FIG. 3 includes a base station, a first user equipment UE1, a second user equipment UE2, and a third user equipment UE3.
- the UE2 and the UE2 perform D2D communication
- the UE3 is a normal cellular network user equipment
- the UE3 performs normal uplink transmission with the base station.
- the base station is the serving base station of the UE1 and the UE3, and the UE2 may belong to the base station or belong to other base stations, which is not limited by the present invention.
- the base station sends uplink pilot resource configuration information to the UE1.
- the base station determines that the D2D transmission of the UE1 may cause strong interference to the uplink transmission of the normal cellular system, for example, the base station detects that the reception quality or the received power of the normal uplink signal decreases to a certain extent, and then passes the radio resource.
- the Radio Resource Control (RRC) signaling is used to configure the uplink pilot resource for the UE1, for example, the Sounding Reference Signal (SRS) is configured to indicate that the UE1 uses a specific SRS pilot sequence on a specific time-frequency resource. And the transmit power to send the SRS.
- RRC Radio Resource Control
- SRS Sounding Reference Signal
- the UE1 sends an uplink pilot signal.
- the UE1 After receiving the signaling of the uplink pilot resource configuration information sent by the base station, the UE1 sends the SRS according to the configuration information. It should be understood that the SRS is used for D2D transmission between UE1 and UE2.
- the base station can also listen to the SRS on the resources occupied by the SRS because it occupies the uplink resources of the ordinary cellular system and has the potential to interfere with the normal uplink transmission.
- the base station monitors an uplink pilot signal, for example, an SRS, on a resource in which UE1 transmits an uplink pilot. Monitor the received strength of the signal after hearing the SRS. Since the transmission power of the uplink pilot signal is configured by the base station to the UE1, the base station can estimate the path loss between the UE1 and the base station according to the transmission power and the reception strength of the uplink pilot signal.
- an uplink pilot signal for example, an SRS
- pathloss_UEl_eNB P_SRS-RSRP
- the pathloss_UE1_eNB indicates the path loss between the UE1 and the base station
- the P_SRS indicates the transmit power of the uplink pilot signal SRS
- the RSRP indicates the received power (intensity) of the SRS.
- the transmit power of the SRS is configured by the base station, and the transmit power has no correlation with the transmit power used for the D2D transmission
- the path loss between the UE1 and the base station is estimated by this step, so as to further further according to the path loss. Estimate the degree of interference caused by different D2D transmission transmit powers for normal uplink transmission.
- the base station calculates the upper limit of the transmit power of the D2D transmission according to the path loss in step 303 and the interference tolerance threshold (Threshold) transmitted by the predefined uplink cellular system.
- the interference acceptance threshold is a received power that is pre-configured by the system to indicate that the base station can tolerate the maximum D2D transmission received by the base station. If the threshold is exceeded, the D2D transmission is considered to be intolerable and strong interference for normal uplink transmission.
- the upper limit of the transmission power of the D2D transmission can be determined by the following formula:
- P - D2Dmax represents the upper limit of the transmit power of the D2D transmission
- pathloss - UEl_eNB is the path loss between the UE1 and the base station.
- a D2D transmission that does not exceed the uplink of the transmit power can be considered to be less interference to the uplink signal reception of the base station and is acceptable.
- the base station sends a maximum transmit power to the UE1.
- the base station informs the abdomen of the maximum transmit power P_D2Dmax obtained in step 304 by RRC signaling.
- UE1 performs power adjustment.
- UE1 After receiving the maximum transmit power, UE1 ensures that the transmit power is lower than when performing D2D transmission.
- P_D2Dmax to avoid excessive interference to the uplink reception of the base station (uplink transmission of UE3). Specifically, after receiving the maximum transmit power, UE1 first compares the current transmit power with the maximum transmit power. If the current transmit power is less than the maximum transmit power, the current transmit power may be maintained. If the current transmit power is greater than the maximum transmit power, the transmit power is reduced to a maximum transmit power, or is reduced below the maximum transmit power.
- the base station measures the uplink pilot signal to estimate the interference caused by the D2D transmission to the uplink transmission of the normal user equipment, and sends the power upper limit or the transmit power reduction command of the D2D transmission to the user performing the D2D transmission by the base station.
- the device limits the interference of the D2D transmission to the uplink signal of the ordinary user equipment, thereby controlling the interference caused by the D2D transmission to an acceptable range.
- FIG. 4 is an interaction diagram of a method for avoiding uplink interference caused by D2D transmission according to another embodiment of the present invention.
- the interaction diagram of FIG. 4 includes a base station, a first user equipment UE1, a second user equipment UE2, and a third user equipment UE3.
- the UE2 and the UE2 perform D2D communication
- the UE3 is a normal cellular network user equipment
- the UE3 performs normal uplink transmission with the base station.
- the base station is the serving base station of the UE1 and the UE3, and the UE2 may belong to the base station or belong to other base stations, which is not limited by the present invention.
- the base station sends uplink pilot resource configuration information to the UE1.
- the base station determines that the D2D transmission of the UE1 may cause strong interference to the uplink transmission of the normal cellular system, for example, the base station detects that the reception quality or the received power of the normal uplink signal decreases to a certain extent, and then passes the RC letter.
- the uplink pilot resource is configured for the UE1, for example, a Demodulation Reference Signal (DMRS) is configured to instruct the UE1 to transmit the DMRS by using a specific DMRS pilot sequence and transmit power on a specific time-frequency resource.
- DMRS Demodulation Reference Signal
- the transmit power used is generally equal to the D2D data transmission power.
- the power is not only configured by the base station to UE1, but also by UE1 according to the D2D transmission path loss and link adaptation.
- the UE1 sends an uplink pilot signal.
- the UE1 After receiving the signaling that is sent by the base station and including the uplink pilot resource configuration information, the UE1 sends the DMRS according to the configuration information. It should be understood that the DMRS is transmitted together with the uplink data of the normal cellular system with the same power and the data transmitted by the actual D2D, so there is a potential for interference to the normal uplink transmission, and the base station can listen to the DMRS on the resources occupied by the DMRS. To estimate the interference of D2D transmission for normal uplink transmission.
- the base station listens to the DMRS, determines the receiving strength of the signal, and uses the received strength as the D2D transmission.
- Threshold the pre-defined interference tolerance threshold
- P_intf is the received power of the DMRS, and specifically, may be RSRP or the like.
- the base station sends a power control command to the UE1.
- step 403 When the formula in the above step 403 is established, it indicates that the D2D transmission causes strong interference to the uplink reception of the base station, and the base station can notify the UE to reduce the transmission power of the D2D transmission through the RRC signaling.
- xdB where:
- the amount of the transmission power reduction may be determined in a manner predefined by the system, or a command for instructing the UE1 to reduce the transmission power step by step may be directly sent, which is not limited by the present invention.
- step 403 When the formula in the above step 403 is not established, it indicates that the D2D transmission does not cause strong interference to the uplink reception of the base station, and no command may be sent, or a command indicating that the UE1 maintains the current transmit power may be sent to the UE1.
- UE1 performs power adjustment.
- UE1 After receiving the power control command sent by the base station, UE1 reduces the current transmit power according to the indication in the command. Specifically, if the power control command carries the reduced amount xdB, the UE1 reduces the xdB based on the existing transmit power. If the control command instructs the UE1 to gradually reduce the transmit power, the UE1 is gradually reduced according to the preset power level of the system. Until the interference tolerance threshold is exceeded (the power control command is no longer received).
- the base station measures the uplink pilot signal to estimate the interference caused by the D2D transmission to the uplink transmission of the normal user equipment, and sends the power upper limit or the transmit power reduction command of the D2D transmission to the user performing the D2D transmission by the base station.
- the device limits the interference of the D2D transmission to the uplink signal of the ordinary user equipment, thereby controlling the interference caused by the D2D transmission to an acceptable range.
- FIG. 5 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
- the base station 50 of Fig. 5 includes a first transmitting unit 51, a receiving unit 52, a determining unit 53, and a second transmitting unit 54.
- the first sending unit 51 sends uplink pilot resource configuration information to the first user equipment.
- the receiving unit 52 receives the uplink pilot signal that is configured and sent by the first user equipment according to the uplink pilot resource configuration information.
- the determining unit 53 determines the power control information according to the received strength of the uplink pilot signal, where The received strength of the signal of the uplink pilot signal indicates that the first user equipment and the second user equipment perform interference caused by the device-to-device D2D transmission to the uplink transmission between the third user equipment and the base station 50.
- the second transmitting unit 54 transmits power control information to the first user equipment.
- the embodiment of the present invention solves the interference of the D2D transmission to the uplink signal of the ordinary user equipment by causing the base station 50 to determine the power control information according to the received strength of the uplink pilot signal, so as to control the transmission power of the D2D transmission by the first user equipment.
- the uplink pilot resource configuration information sent by the first sending unit 51 includes at least one of the following: a time-frequency resource occupied by an uplink pilot signal; a pilot sequence of an uplink pilot signal; and an uplink pilot.
- the uplink pilot resource configuration information may be pre-configured by the base station 51 to indicate that the first user equipment transmits the uplink pilot signal with a specific transmit power on a specific time-frequency resource by using a specific pilot sequence.
- the determining unit 53 is specifically configured to: determine a path loss between the first user equipment and the base station 50 according to a signal receiving strength of the uplink pilot signal and a transmit power of the uplink pilot signal; And determining, by the preset interference tolerance threshold, a maximum transmit power of the first user equipment to perform D2D transmission, where the interference tolerance threshold is a maximum received power that the base station 50 can tolerate receiving the D2D transmission.
- the transmit power of the uplink pilot signal is pre-configured by the base station 50 by using uplink pilot resource configuration information, and the transmit power may be the same as or different from the transmit power of the actual D2D data transmission, when the transmit power and the actual D2D data transmission are performed.
- the path loss between the first user equipment and the base station may be estimated according to the received power of the uplink pilot signal. And further determining the maximum transmit power of the D2D transmission according to the interference tolerance threshold.
- the second sending unit 54 is specifically configured to: send a maximum transmit power to the first user equipment, so that the transmit power of the first user equipment to perform D2D transmission is less than the maximum transmit power.
- the determining unit 53 is further configured to: determine, according to the signal receiving strength of the uplink pilot signal and the preset interference tolerance threshold, whether the D2D transmission causes uplink interference to the third user equipment, where the interference The threshold is the maximum received power that the base station 50 can tolerate to receive the D2D transmission; when the signal received strength of the uplink pilot signal is greater than or equal to the interference tolerance threshold, the amount of decrease in the transmit power of the first user equipment to perform the D2D transmission is determined.
- the transmit power of the uplink pilot signal is substantially the same as the transmit power of the actual D2D data transmission
- the demodulation reference signal DMRS is used as the uplink pilot signal
- the received strength of the uplink pilot signal can be directly used as the interference strength of the D2D transmission for the uplink signal of the common user equipment.
- the second sending unit 54 is specifically configured to: send, to the first user equipment, a decrease amount of the transmit power of the D2D transmission, so that the transmit power of the D2D transmission performed by the first user equipment is reduced to an interference tolerance threshold. the following.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the embodiment of the present invention measures the uplink pilot signal by the base station 50 to estimate the interference caused by the uplink transmission of the D2D transmission to the normal user equipment, and sends the power upper limit or the transmission power reduction command of the D2D transmission to the D2D transmission through the base station 50.
- the user equipment is used to limit the interference of the D2D transmission to the uplink signal of the ordinary user equipment, thereby controlling the interference caused by the D2D transmission to an acceptable range.
- FIG. 6 is a schematic block diagram of a user equipment in accordance with one embodiment of the present invention.
- the user equipment 60 of FIG. 6 includes a first receiving unit 61, a configuration unit 62, a transmitting unit 63, and a second receiving unit 64.
- the first receiving unit 61 receives the uplink pilot resource configuration information sent by the base station.
- the configuration unit 62 configures the uplink pilot signal according to the uplink pilot resource configuration information.
- the sending unit 63 sends the uplink pilot signal configured by the configuration unit, so that the base station determines the power control information according to the received strength of the uplink pilot signal, where the received strength of the signal of the uplink pilot signal indicates the user equipment 60 and the second user equipment execution device.
- the second receiving unit 64 receives power control information transmitted by the base station.
- the embodiment of the present invention solves the interference of the D2D transmission to the uplink signal of the ordinary user equipment by causing the base station to determine the power control information according to the received strength of the uplink pilot signal, so as to control the transmission power of the D2D transmission by the user equipment 60.
- the uplink pilot resource configuration information may include at least one of the following: a time-frequency resource occupied by the uplink pilot signal; a pilot sequence of the uplink pilot signal; and a transmit power of the uplink pilot signal.
- the uplink pilot resource configuration information may be pre-configured by the base station, and is used to indicate that the user equipment 60 uses a specific pilot sequence to transmit the uplink pilot signal with a specific transmit power on a specific time-frequency resource.
- the uplink pilot signal includes a sounding reference signal SRS or a demodulation reference signal DMRS.
- the user equipment 60 receives power control information sent by the base station, and performs transmit power adjustment of the D2D transmission according to the power control information.
- the power control information includes the maximum transmit power of the D2D transmission determined by the base station
- the user equipment 60 ensures that the transmit power of the D2D transmission is less than the maximum transmit power.
- the power control information includes the amount of decrease in the transmit power of the D2D transmission, the user equipment 60 adjusts the current D2D transmission transmission power according to the reduction amount.
- the base station measures the uplink pilot signal to estimate the interference caused by the D2D transmission to the uplink transmission of the normal user equipment, and sends the power upper limit or the transmit power reduction command of the D2D transmission to the user performing the D2D transmission by the base station.
- the device limits the interference of the D2D transmission to the uplink signal of the ordinary user equipment, thereby controlling the interference caused by the D2D transmission to an acceptable range.
- a communication system in accordance with an embodiment of the present invention may include the user equipment 60 or base station 50 described above.
- FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention.
- the base station 70 of FIG. 7 includes a memory 71, a processor 72, a transmitting circuit 73, and an antenna 74.
- the memory 71 stores an instruction for the processor 72 to: the first user equipment sends the uplink pilot resource configuration information; and receives the uplink pilot signal that is configured and sent by the first user equipment according to the uplink pilot resource configuration information; The received strength of the frequency signal determines the power control information, wherein the received strength of the signal of the uplink pilot signal indicates that the first user equipment and the second user equipment perform interference caused by the device-to-device D2D transmission to the uplink transmission between the third user equipment and the base station. ; transmitting power control information to the first user equipment.
- the embodiment of the present invention solves the interference of the D2D transmission to the uplink signal of the ordinary user equipment by causing the base station 70 to determine the power control information according to the received strength of the uplink pilot signal, so as to control the transmission power of the D2D transmission by the first user equipment.
- the base station 70 may further include a receiving circuit 75 and the like.
- the processor 72 controls the operation of the base station 70, which may also be referred to as a CPU (Central Processing Unit).
- Memory 71 can include read only memory and random access memory and provides instructions and data to processor 72. A portion of the memory 71 may also include non-volatile random access memory (NVRAM).
- transmit circuitry 73 and receive circuitry 75 can be coupled to antenna 74.
- the various components of base station 70 are coupled together by a bus system 77, which may include, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for the sake of clarity, the various buses are labeled as bus system 77 in the figure.
- Processor 72 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 72 or an instruction in the form of software.
- the processor 72 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware. Component.
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA off-the-shelf programmable gate array
- the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or executed.
- the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
- the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
- the storage medium is located in the memory 71.
- the processor 72 reads the information in the memory 71 and completes the steps of the above method in combination with its hardware.
- the processor 71 is specifically configured to determine a path loss between the first user equipment and the base station according to a signal receiving strength of the uplink pilot signal and a transmit power of the uplink pilot signal; and according to the path
- the loss and the preset interference tolerance threshold determine the maximum transmit power of the first user equipment to perform D2D transmission, wherein the interference tolerance threshold is the maximum received power that the base station 70 can tolerate receiving the D2D transmission.
- the processor 71 is further configured to determine, according to the signal receiving strength of the uplink pilot signal and the preset interference tolerance threshold, whether the D2D transmission causes uplink interference to the third user equipment, where the interference The tolerance threshold is the maximum received power of the D2D transmission that the base station 70 can tolerate; when the signal reception strength of the uplink pilot signal is greater than or equal to the interference tolerance threshold, the amount of reduction of the transmission power of the D2D transmission performed by the first user equipment is determined.
- the uplink pilot signal comprises a sounding reference signal SRS or a demodulation reference signal DMRS.
- the base station 70 may perform the method performed by the base station in FIG. 1 to FIG. 4, and details are not described herein again.
- FIG. 8 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
- the user equipment 80 of FIG. 8 includes a processor 81 and a memory 82.
- the processor 81 and the memory 82 are connected by a bus system 83.
- the memory 82 is configured to store an instruction that causes the processor 81 to: receive uplink pilot resource configuration information sent by the base station; configure and transmit an uplink pilot signal according to the uplink pilot resource configuration information, so that the base station is configured according to the uplink pilot signal.
- Receive strength determining power control information wherein the received strength of the signal of the uplink pilot signal indicates that the user equipment 80 and the second user equipment perform the device to
- the device D2D transmits interference caused by uplink transmission between the third user equipment and the base station; and receives power control information sent by the base station.
- the base station determines the power control information according to the received strength of the uplink pilot signal, so as to control the transmission power of the D2D transmission by the user equipment 80, thereby solving the interference of the D2D transmission to the uplink signal of the ordinary user equipment.
- the user equipment 80 may further include a transmitting circuit 84, a receiving circuit 85, an antenna 86, and the like.
- the processor 81 controls the operation of the user equipment 80, which may also be referred to as a CPU (Central Processing Unit).
- Memory 82 can include read only memory and random access memory and provides instructions and data to processor 81. A portion of the memory 82 may also include non-volatile random access memory (NVRAM).
- transmit circuitry 84 and receive circuitry 88 can be coupled to antenna 86.
- the various components of the user equipment 80 are coupled together by a bus system 83, which may include, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 83 in the figure.
- the method disclosed in the foregoing embodiments of the present invention may be applied to the processor 81 or by the processor.
- Processor 81 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 81 or an instruction in the form of software.
- the processor 81 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware. Component.
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA off-the-shelf programmable gate array
- the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
- the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
- the steps of the method disclosed in connection with the embodiments of the present invention may be directly embodied by the execution of the hardware decoding processor or by a combination of hardware and software modules in the decoding processor.
- the software module can be located in a conventional storage medium such as a random access memory, a flash memory, a read only memory, a programmable read only memory, or an electrically erasable programmable memory, a register, or the like.
- the storage medium is located in the memory 82, and the processor 81 reads the information in the memory 82 and combines the hardware to perform the steps of the above method.
- the uplink pilot resource configuration information may include at least one of the following: a time-frequency resource occupied by the uplink pilot signal; a pilot sequence of the uplink pilot signal; and a transmit power of the uplink pilot signal.
- the uplink pilot resource configuration information may be pre-configured by the base station, and is used to indicate that the first user equipment adopts a specific pilot sequence on a specific time-frequency resource with a specific transmit power. Send an uplink pilot signal.
- the uplink pilot signal comprises a sounding reference signal SRS or a demodulation reference signal DMRS.
- the user equipment 80 receives power control information sent by the base station, and performs transmit power adjustment of the D2D transmission according to the power control information.
- the power control information includes the maximum transmit power of the D2D transmission determined by the base station
- the user equipment 80 ensures that the transmit power of the D2D transmission is less than the maximum transmit power.
- the power control information includes the amount of decrease in the transmission power of the D2D transmission, the user equipment 80 adjusts the current D2D transmission transmission power according to the reduction amount.
- the user equipment 80 may perform the method performed by the first user equipment (UE1) of FIG. 2 to FIG. 4, and details are not described herein again.
- RAM random access memory
- ROM read only memory
- EEPROM electrically programmable ROM
- EEPly erasable programmable ROM registers
- hard disk removable disk
- CD-ROM computer-readable medium
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Abstract
提供一种避免D2D传输造成上行干扰的方法、基站和用户设备。该方法包括:基站向第一用户设备发送上行导频资源配置信息;基站接收第一用户设备跟据上行导频资源配置信息配置并发送的上行导频信号;基站根据上行导频信号的接收强度确定功率控制信息,其中上行导频信号的信号的接收强度指示第一用户设备和第二用户设备执行设备到设备D2D传输对第三用户设备和基站间的上行传输造成的干扰;基站向第一用户设备发送功率控制信息。通过使得基站根据上行导频信号的接收强度确定功率控制信息,可以控制第一用户设备执行D2D传输的发送功率,从而解决了D2D传输对普通用户设备上行信号的干扰。
Description
避免 D2D传输造成上行干扰的方法、 基站和用户设备 本申请要求于 2013 年 6 月 24 日提交中国专利局、 申请号为 201310250304.9、 发明名称为"避免 D2D传输造成上行干扰的方法、 基站和 用户设备"的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及无线通信领域, 并且更具体地, 涉及避免 D2D传输造成上 行干扰的方法、 基站和用户设备。 背景技术
设备到设备(Device-to-Device, D2D )通信是一种在系统的控制下, 允 许终端之间通过复用小区资源直接进行通信的新型技术。 D2D在传输信号时 一般复用小区的上行链路资源。 在 D2D传输中, 如果用户设备 D1和用户设 备 D2 发现彼此距离很近, 就可以绕开基站, 比如演进型基站 (eNB 或 e-NodeB, evolutional Node B ), 直接建立连接并将相应的数据发送给对方。 D2D可以占用正常的蜂窝通信所使用的频带资源以节省用户设备( UE, User Equipment ) 的设备成本, 只需要增加一个在上行频带的接收功能。
由于占用了蜂窝通信的上行频带, D2D传输和正常的蜂窝系统的上行传 输会同时存在, 这就有可能会产生相互之间的干扰。 不能容忍的是, 正常的 蜂窝系统的上行传输会受到 D2D传输的干扰, 导致传输质量的下降, 尤其 是进行 D2D传输的设备举例基站较近时, 可能会造成巨大的上行干扰。 发明内容
本发明实施例提供一种避免 D2D传输造成上行干扰的方法、 基站和用 户设备, 能够解决 D2D传输对普通用户设备上行信号的干扰。
第一方面, 提供了一种避免 D2D传输造成上行干扰的方法, 包括: 基 站向第一用户设备发送上行导频资源配置信息; 所述基站接收所述第一用户 设备跟据所述上行导频资源配置信息配置并发送的上行导频信号; 所述基站 根据所述上行导频信号的接收强度确定功率控制信息, 其中所述上行导频信 号的信号的接收强度指示所述第一用户设备和第二用户设备执行设备到设
备 D2D传输对第三用户设备和所述基站间的上行传输造成的干扰; 所述基 站向所述第一用户设备发送所述功率控制信息。
结合第一方面, 在其第一种实现方式中, 所述上行导频资源配置信息包 括以下至少一种: 所述上行导频信号占用的时频资源; 所述上行导频信号的 导频序列; 所述上行导频信号的发射功率。
结合第一方面及其上述实现方式, 在其第二种实现方式中, 所述根据所 述上行导频信号的信号接收强度确定功率控制信息, 包括: 根据所述上行导 频信号的信号接收强度和所述上行导频信号的发射功率, 确定所述第一用户 设备与基站间的路径损耗; 根据所述路径损耗和预设的干扰承受门限, 确定 所述第一用户设备执行 D2D传输的最大发射功率, 其中所述干扰承受门限 为所述基站能够容忍的接收到所述 D2D传输的最大接收功率。
结合第一方面及其上述实现方式, 在其第三种实现方式中, 所述向所述 第一用户设备发送所述功率控制信息包括: 向所述第一用户设备发送所述最 大发射功率, 使得所述第一用户设备执行 D2D传输的发射功率小于所述最 大发射功率。
结合第一方面及其上述实现方式, 在其第四种实现方式中, 所述根据所 述上行导频信号的信号接收强度确定功率控制信息, 包括: 根据所述上行导 频信号的信号接收强度和预设的干扰承受门限, 确定所述 D2D传输是否对 所述第三用户设备造成上行干扰, 其中所述干扰承受门限为所述基站能够容 忍的接收到所述 D2D传输的最大接收功率; 当所述上行导频信号的信号接 收强度大于或者等于所述干扰承受门限时,确定所述第一用户设备执行 D2D 传输的发射功率的降低量。
结合第一方面及其上述实现方式, 在其第五种实现方式中, 所述向所述 第一用户设备发送所述功率控制信息包括: 向所述第一用户设备发送所述 D2D传输的发射功率的降低量, 以使得所述第一用户设备执行 D2D传输的 发射功率降低至所述干扰承受门限以下。
结合第一方面及其上述实现方式, 在其第六种实现方式中, 所述上行导 频信号包括探测参考信号 SRS或解调参考信号 DMRS。
第二方面, 提供了一种避免 D2D传输造成上行干扰的方法, 包括: 第 一用户设备接收基站发送的上行导频资源配置信息; 所述第一用户设备根据 所述上行导频资源配置信息配置并发送上行导频信号, 以便于所述基站根据
所述上行导频信号的接收强度确定功率控制信息, 其中所述上行导频信号的 信号的接收强度指示所述第一用户设备和第二用户设备执行设备到设备
D2D传输对第三用户设备和所述基站间的上行传输造成的干扰;所述第一用 户设备接收所述基站发送的所述功率控制信息。
结合第二方面, 在其第一种实现方式中, 所述上行导频资源配置信息包 括以下至少一种: 所述上行导频信号占用的时频资源; 所述上行导频信号的 导频序列; 所述上行导频信号的发射功率。
结合第二方面及其上述实现方式, 在其第二种实现方式中, 所述上行导 频信号包括探测参考信号 SRS或解调参考信号 DMRS。
第三方面, 提供了一种基站, 包括: 第一发送单元, 用于向第一用户设 备发送上行导频资源配置信息; 接收单元, 用于接收所述第一用户设备跟据 所述上行导频资源配置信息配置并发送的上行导频信号; 确定单元, 用于根 据所述上行导频信号的接收强度确定功率控制信息, 其中所述上行导频信号 的信号的接收强度指示所述第一用户设备和第二用户设备执行设备到设备 D2D传输对第三用户设备和所述基站间的上行传输造成的干扰;第二发送单 元, 用于向所述第一用户设备发送所述功率控制信息。
结合第三方面, 在其第一种实现方式中, 所述第一发送单元发送的上行 导频资源配置信息包括以下至少一种: 所述上行导频信号占用的时频资源; 所述上行导频信号的导频序列; 所述上行导频信号的发射功率。
结合第三方面及其上述实现方式, 在其第二种实现方式中, 所述确定单 元具体用于: 根据所述上行导频信号的信号接收强度和所述上行导频信号的 发射功率, 确定所述第一用户设备与基站间的路径损耗; 根据所述路径损耗 和预设的干扰承受门限, 确定所述第一用户设备执行 D2D传输的最大发射 功率, 其中所述干扰承受门限为所述基站能够容忍的接收到所述 D2D传输 的最大接收功率。
结合第三方面及其上述实现方式, 在其第三种实现方式中, 所述第二发 送单元具体用于: 向所述第一用户设备发送所述最大发射功率, 使得所述第 一用户设备执行 D2D传输的发射功率小于所述最大发射功率。
结合第三方面及其上述实现方式, 在其第四种实现方式中, 所述确定单 元具体用于: 根据所述上行导频信号的信号接收强度和预设的干扰承受门 限, 确定所述 D2D传输是否对所述第三用户设备造成上行干扰, 其中所述
干扰承受门限为所述基站能够容忍的接收到所述 D2D传输的最大接收功率; 当所述上行导频信号的信号接收强度大于或者等于所述干扰承受门限时, 确 定所述第一用户设备执行 D2D传输的发射功率的降低量。
结合第三方面及其上述实现方式, 在其第五种实现方式中, 所述第二发 送单元具体用于: 向所述第一用户设备发送所述 D2D传输的发射功率的降 低量, 以使得所述第一用户设备执行 D2D传输的发射功率降低至所述干扰 承受门限以下。
结合第三方面及其上述实现方式, 在其第六种实现方式中, 所述上行导 频信号包括探测参考信号 SRS或解调参考信号 DMRS。
第四方面, 提供了一种用户设备, 包括: 第一接收单元, 用于接收基站 发送的上行导频资源配置信息; 配置单元, 用于根据所述上行导频资源配置 信息配置上行导频信号; 发送单元, 用于发送所述配置单元配置的上行导频 信号, 以便于所述基站根据所述上行导频信号的接收强度确定功率控制信 息, 其中所述上行导频信号的信号的接收强度指示所述第一用户设备和第二 用户设备执行设备到设备 D2D传输对第三用户设备和所述基站间的上行传 输造成的干扰;第二接收单元,用于接收所述基站发送的所述功率控制信息。
结合第四方面, 在其第一种实现方式中, 所述上行导频资源配置信息包 括以下至少一种: 所述上行导频信号占用的时频资源; 所述上行导频信号的 导频序列; 所述上行导频信号的发射功率。
结合第四方面及其上述实现方式, 在其第二种实现方式中, 所述上行导 频信号包括探测参考信号 SRS或解调参考信号 DMRS。
本发明实施例通过使得基站根据上行导频信号的接收强度确定功率控 制信息, 以控制第一用户设备执行 D2D传输的发送功率, 从而解决了 D2D 传输对普通用户设备上行信号的干扰。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作简单地介绍, 显而易见地, 下面所描述的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的 前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明一个实施例避免 D2D传输造成上行干扰的方法流程图。
图 2是本发明一个实施例避免 D2D传输造成上行干扰的方法流程图。 图 3是本发明一个实施例避免 D2D传输造成上行干扰的方法交互图。 图 4是本发明另一实施例避免 D2D传输造成上行干扰的方法交互图。 图 5是本发明一个实施例的基站的示意框图。
图 6是本发明一个实施例的用户设备的示意框图。
图 7是本发明另一实施例的基站的示意框图。
图 8是本发明另一实施例的用户设备的示意框图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创 造性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
本发明的技术方案, 可以应用于各种通信系统, 例如: 全球移动通信系 统 ( GSM, Global System of Mobile communication ), 码分多址( CDMA, Code Division Multiple Access ) 系统, 宽带码分多址 ( WCDMA, Wideband Code Division Multiple Access Wireless ), 通用分组无线业务 ( GPRS, General Packet Radio Service ), 长期演进 ( LTE, Long Term Evolution ) 等。
用户设备 ( UE, User Equipment ), 也可称之为移动终端 ( Mobile Terminal )、移动用户设备等, 可以经无线接入网(例如, RAN , Radio Access Network ) 与一个或多个核心网进行通信, 用户设备可以是移动终端, 如移 动电话 (或称为"蜂窝"电话)和具有移动终端的计算机, 例如, 可以是便携 式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置, 它们与无线接入 网交换语言和 /或数据。
基站,可以是 GSM或 CDMA中的基站( BTS , Base Transceiver Station ), 也可以是 WCDMA中的基站( NodeB ),还可以是 LTE中的演进型基站( eNB 或 e-NodeB, evolutional Node B ), 本发明并不限定。
图 1是本发明一个实施例避免 D2D传输造成上行干扰的方法流程图。 图 1的方法由基站执行。
101, 基站向第一用户设备发送上行导频资源配置信息。
102, 基站接收第一用户设备跟据上行导频资源配置信息配置并发送的
上行导频信号。
103, 基站根据上行导频信号的接收强度确定功率控制信息, 其中上行 导频信号的信号的接收强度指示第一用户设备和第二用户设备执行设备到 设备 D2D传输对第三用户设备和基站间的上行传输造成的干扰。
104, 基站向第一用户设备发送功率控制信息。
本发明实施例通过使得基站根据上行导频信号的接收强度确定功率控 制信息, 以控制第一用户设备执行 D2D传输的发送功率, 从而解决了 D2D 传输对普通用户设备上行信号的干扰。
可选地, 作为一个实施例, 上行导频资源配置信息可以包括以下至少一 种: 上行导频信号占用的时频资源; 上行导频信号的导频序列; 上行导频信 号的发射功率。 上行导频资源配置信息可以是由基站预先配置的, 用于指示 第一用户设备在特定的时频资源上釆用特定的导频序列以特定的发射功率 发送上行导频信号。
可选地, 作为一个实施例, 上述步骤 103具体可以包括: 根据上行导频 信号的信号接收强度和上行导频信号的发射功率, 确定第一用户设备与基站 间的路径损耗; 根据路径损耗和预设的干扰承受门限, 确定第一用户设备执 行 D2D传输的最大发射功率, 其中干扰承受门限为基站能够容忍的接收到 D2D传输的最大接收功率。
具体地, 上行导频信号的发射功率是由基站通过上行导频资源配置信息 预先配置的, 该发射功率可以与实际 D2D数据传输的发送功率相同或者不 同, 当该发射功率与实际 D2D数据传输的发送功率不同, 或者不知道是否 相同时, 例如, 采用探测参考信号 SRS作为上行导频信号时, 可以根据该上 行导频信号的接收功率估计出第一用户设备与基站之间的路径损耗, 并进一 步根据干扰^受门限确定出 D2D传输的最大发射功率。
可选地, 作为一个实施例, 步骤 104可以包括: 向第一用户设备发送最 大发射功率, 使得第一用户设备执行 D2D传输的发射功率小于最大发射功 率。
可选地, 作为一个实施例, 步骤 103还可以包括: 才艮据上行导频信号的 信号接收强度和预设的干扰承受门限, 确定 D2D传输是否对第三用户设备 造成上行干扰, 其中干扰承受门限为基站能够容忍的接收到 D2D传输的最 大接收功率; 当上行导频信号的信号接收强度大于或者等于干扰承受门限
时, 确定第一用户设备执行 D2D传输的发射功率的降低量。
具体地, 当上行导频信号的发射功率与实际 D2D数据传输的发送功率 基本相同时, 例如, 采用解调参考信号 DMRS 作为上行导频信号时, 可以 直接将该上行导频信号的接收强度作为 D2D传输对于普通用户设备上行信 号的干扰强度。
另外, 可选地, 第一用户设备执行 D2D传输的发射功率的降低量可以 通过系统预设的公式来确定, 也可以用上行导频信号的信号接收强度超出干 扰承受门限的部分加上一个系统预设的值来作为 D2D传输的发射功率的降 低量。
可选地, 作为一个实施例, 步骤 104还可以包括: 向第一用户设备发送
D2D传输的发射功率的降低量, 以使得第一用户设备执行 D2D传输的发射 功率降低至干 受门限以下。
可选地,作为一个实施例,上行导频信号包括探测参考信号 SRS或解调 参考信号 DMRS。
本发明实施例通过基站测量上行导频信号, 来估计 D2D传输对于正常 用户设备的上行传输所带来的干扰, 并通过基站将 D2D传输的功率上限或 者发射功率降低命令发送给执行 D2D传输的用户设备, 以限制 D2D传输对 普通用户设备上行信号的千扰, 从而将 D2D传输带来的干扰控制在可接受 的范围内。
图 2是本发明一个实施例避免 D2D传输造成上行干扰的方法流程图。 图 2的方法由第一用户设备 UE1执行。
201, 第一用户设备接收基站发送的上行导频资源配置信息。
202, 第一用户设备根据上行导频资源配置信息配置并发送上行导频信 号, 以便于基站根据上行导频信号的接收强度确定功率控制信息, 其中上行 导频信号的信号的接收强度指示第一用户设备和第二用户设备执行设备到 设备 D2D传输对第三用户设备和基站间的上行传输造成的干扰。
203, 第一用户设备接收基站发送的功率控制信息。
本发明实施例通过使得基站根据上行导频信号的接收强度确定功率控 制信息, 以控制第一用户设备执行 D2D传输的发送功率, 从而解决了 D2D 传输对普通用户设备上行信号的干扰。
可选地, 作为一个实施例, 上行导频资源配置信息可以包括以下至少一
种: 上行导频信号占用的时频资源; 上行导频信号的导频序列; 上行导频信 号的发射功率。 上行导频资源配置信息可以是由基站预先配置的, 用于指示 第一用户设备在特定的时频资源上采用特定的导频序列以特定的发射功率 发送上行导频信号。
可选地,作为一个实施例,上行导频信号包括探测参考信号 SRS或解调 参考信号 DMRS。
可选地, 第一用户设备接收基站发送的功率控制信息, 并根据该功率控 制信息进行 D2D传输的发射功率调整。当功率控制信息包括基站确定的 D2D 传输的最大发射功率时, 第一用户设备确保 D2D传输的发射功率小于该最 大发射功率。 当功率控制信息包括 D2D传输的发射功率的降低量时, 第一 用户设备根据该降低量调整当前的 D2D传输发射功率。
本发明实施例通过基站测量上行导频信号, 来估计 D2D传输对于正常 用户设备的上行传输所带来的干扰, 并通过基站将 D2D传输的功率上限或 普通用户设备上行信号的干扰, 从而将 D2D传输带来的干扰控制在可接受 的范围内。
图 3是本发明一个实施例避免 D2D传输造成上行干扰的方法交互图。 图 3的交互图中包括基站、 第一用户设备 UE1、 第二用户设备 UE2、 第三用 户设备 UE3。 其中, UE1与 UE2之间执行 D2D通信, 而 UE3为普通蜂窝网 用户设备, UE3与基站执行普通上行传输。基站为 UE1和 UE3的服务基站, 而 UE2可以属于该基站也可以属于其他基站, 本发明对此不做限定。
301 , 基站向 UE1发送上行导频资源配置信息。
具体地, 当基站判断 UE1的 D2D传输可能会对正常的蜂窝系统上行传 输产生较强干扰时, 例如基站检测到普通上行信号的接收质量或接收功率等 指标的降低达到一定程度, 则通过无线资源控制 (Radio Resource Control, RRC ) 信令给 UE1 配置上行导频资源, 例如, 配置上行侦测参考信号 ( Sounding Reference Signal, SRS ), 指示 UE1在特定的时频资源上采用特 定的 SRS导频序列以及发射功率来发送 SRS。
302, UE1发送上行导频信号。
UE1在接收到基站发送的包含有上行导频资源配置信息的信令后,根据 该配置信息发送 SRS。 应理解, 该 SRS是用于 UE1与 UE2之间的 D2D传
输的, 由于其占用普通蜂窝系统的上行资源, 并存在对于普通上行传输造成 干扰的潜在可能, 所以基站也可以在该 SRS所占用的资源上监听该 SRS。
303, 确定 UE1与基站之间的路径损耗。
基站在 UE1发送上行导频的资源上监听上行导频信号, 例如, SRS。 监 听到 SRS后确定信号的接收强度。由于上行导频信号的发射功率是由基站配 置给 UE1, 所以基站可以根据上行导频信号的发射功率和接收强度来估计 UE1与基站之间的路径损耗。 例如,
pathloss_UEl_eNB=P_SRS-RSRP
其中, pathloss— UE1— eNB表示 UE1与基站之间的路径损耗, P_SRS表 示上行导频信号 SRS的发射功率, RSRP表示 SRS的接收功率 (强度)。
应理解, 由于 SRS的发射功率是由基站配置的, 而该发射功率与 D2D 传输所用的发射功率没有相关性, 所以通过该步骤来估计 UE1 与基站间的 路径损耗, 以便于进一步根据路径损耗来估计不同的 D2D传输发射功率对 于普通上行传输造成的干扰程度。
304, 确定最大发射功率。
基站根据步骤 303中的路径损耗以及预定义的上行蜂窝系统传输的干扰 承受门限(Threshold ), 计算出 D2D传输的发射功率的上限。 其中, 干扰承 受门限是由系统预先配置的用于指示基站能够容忍的该基站接收到的最大 的 D2D传输的接收功率, 超过该门限则认为 D2D传输对于正常上行传输造 成不可容忍的强干扰。 具体地, 可以通过以下公式确定 D2D传输的发射功 率的上限:
P_D2Dmax*pathloss_UE 1—eNB ^Threshold
其中, P— D2Dmax表示 D2D传输的发射功率的上限, pathloss— UEl_eNB 为 UE1与基站之间的路径损耗。 不超过该发射功率上线的 D2D传输都可以 被认为对基站的上行信号接收干扰较小, 并且可以接受。
305 , 基站向 UE1发送最大发射功率。
基站将步骤 304中得到的最大发射功率 P_D2Dmax通过 RRC信令通知 腹。
306, UE1进行功率调整。
接收到最大发射功率后, UE1在进行 D2D传输时, 确保发射功率低于
P_D2Dmax, 以避免对基站的上行接收( UE3的上行传输)造成过大的干扰。
具体地, UE1接收到最大发射功率后, 首先比较当前的发射功率与该最大发 射功率, 如杲当前发射功率小于最大发射功率, 则可以维持当前发射功率。 如果当前发射功率大于最大发射功率, 则将发射功率降低至最大发射功率, 或者降低至低于该最大发射功率。
本发明实施例通过基站测量上行导频信号, 来估计 D2D传输对于正常 用户设备的上行传输所带来的干扰, 并通过基站将 D2D传输的功率上限或 者发射功率降低命令发送给执行 D2D传输的用户设备, 以限制 D2D传输对 普通用户设备上行信号的干扰, 从而将 D2D传输带来的干扰控制在可接受 的范围内。
图 4是本发明另一实施例避免 D2D传输造成上行干扰的方法交互图。 图 4的交互图中包括基站、 第一用户设备 UE1、 第二用户设备 UE2、 第三用 户设备 UE3。 其中, UE1与 UE2之间执行 D2D通信, 而 UE3为普通蜂窝网 用户设备, UE3与基站执行普通上行传输。基站为 UE1和 UE3的服务基站, 而 UE2可以属于该基站也可以属于其他基站, 本发明对此不做限定。
401 , 基站向 UE1发送上行导频资源配置信息。
具体地, 当基站判断 UE1的 D2D传输可能会对正常的蜂窝系统上行传 输产生较强干扰时, 例如基站检测到普通上行信号的接收质量或接收功率等 指标的降低达到一定程度,则通过 RC信令给 UE1配置上行导频资源,例如, 配置解调参考信号 (Demodulation Reference Signal, DMRS ), 指示 UE1在 特定的时频资源上采用特定的 DMRS导频序列以及发射功率来发送 DMRS。 对于 DMRS来说, 所使用的发射功率一般来说等于 D2D数据传输功率, 该 功率除了由基站配置给 UE1, 也可以由 UE1根据 D2D传输路径损耗和链路 自适应自己获取。
402, UE1发送上行导频信号。
UE1在接收到基站发送的包含有上行导频资源配置信息的信令后,根据 该配置信息发送 DMRS。 应理解, DMRS以与实际 D2D传输的数据以同样 的功率占用普通蜂窝系统的上行资源来一同发送, 因此存在对于普通上行传 输造成干扰的潜在可能, 而基站则可以在 DMRS 占用的资源上监听 DMRS 来估计 D2D传输对于普通上行传输的干扰。
403, 判断是否为强干扰。
基站监听 DMRS , 确定该信号的接收强度, 以此接收强度作为 D2D传
输对于基站的上行接收(UE3上行传输)的干扰强度。 根据估计的干扰强度 以及预定义的上行蜂窝系统传输的干扰承受门限( Threshold ), 判断该 D2D 传输是否对上行接收产生了过强的干扰, 例如:
P_intf>=Threshold
其中, P— intf为 DMRS的接收功率, 具体地, 可以是 RSRP等。
404, 基站向 UE1发送功率控制命令。
当上述步骤 403 中的公式成立时, 表示 D2D传输对基站的上行接收造 成了强干扰, 基站可以通过 RRC信令通知 UE降低 D2D传输的发射功率。 例如 xdB, 其中:
x=Log ( P_intf / Threshold )
或者, 可以通过系统预先定义的方式确定发射功率降低量, 也可以直接 发送一个用于指示 UE1逐级降低发射功率的命令, 本发明对此不做限定。
当当上述步骤 403 中的公式不成立时, 说明 D2D传输没有对基站的上 行接收造成了强干扰, 则可以不发送任何命令, 或者向 UE1发送指示 UE1 维持当前发射功率的命令。
405, UE1进行功率调整。
UE1收到基站发送的功率控制命令后,根据命令中的指示降低当前的发 射功率。 具体地, 如果功率控制命令中携带有降低量 xdB, 则 UEl在现有发 射功率基础上降低 xdB, 如果控制命令指示 UE1 逐级降低发射功率时, 则 UE1根据系统预设的功率级别逐级降低 , 直至低于干扰承受门限(不再接收 到功率控制命令)。
本发明实施例通过基站测量上行导频信号, 来估计 D2D传输对于正常 用户设备的上行传输所带来的干扰, 并通过基站将 D2D传输的功率上限或 者发射功率降低命令发送给执行 D2D传输的用户设备, 以限制 D2D传输对 普通用户设备上行信号的干扰, 从而将 D2D传输带来的干扰控制在可接受 的范围内。
图 5是本发明一个实施例的基站的示意框图。 图 5的基站 50包括第一 发送单元 51、 接收单元 52、 确定单元 53和第二发送单元 54。
第一发送单元 51 向第一用户设备发送上行导频资源配置信息。 接收单 元 52接收第一用户设备跟据上行导频资源配置信息配置并发送的上行导频 信号。 确定单元 53根据上行导频信号的接收强度确定功率控制信息, 其中
上行导频信号的信号的接收强度指示第一用户设备和第二用户设备执行设 备到设备 D2D传输对第三用户设备和基站 50间的上行传输造成的干扰。 第 二发送单元 54向第一用户设备发送功率控制信息。
本发明实施例通过使得基站 50根据上行导频信号的接收强度确定功率 控制信息,以控制第一用户设备执行 D2D传输的发送功率,从而解决了 D2D 传输对普通用户设备上行信号的干扰。
可选地, 作为一个实施例, 第一发送单元 51发送的上行导频资源配置 信息包括以下至少一种: 上行导频信号占用的时频资源; 上行导频信号的导 频序列; 上行导频信号的发射功率。上行导频资源配置信息可以是由基站 51 预先配置的, 用于指示第一用户设备在特定的时频资源上采用特定的导频序 列以特定的发射功率发送上行导频信号。
可选地, 作为一个实施例, 确定单元 53具体用于: 根据上行导频信号 的信号接收强度和上行导频信号的发射功率, 确定第一用户设备与基站 50 间的路径损耗; 根据路径损耗和预设的干扰承受门限, 确定第一用户设备执 行 D2D传输的最大发射功率, 其中干扰承受门限为基站 50能够容忍的接收 到 D2D传输的最大接收功率。 具体地, 上行导频信号的发射功率是由基站 50通过上行导频资源配置信息预先配置的, 该发射功率可以与实际 D2D数 据传输的发送功率相同或者不同, 当该发射功率与实际 D2D数据传输的发 送功率不同, 或者不知道是否相同时, 例如, 采用探测参考信号 SRS作为上 行导频信号时, 可以根据该上行导频信号的接收功率估计出第一用户设备与 基站之间的路径损耗, 并进一步根据干扰承受门限确定出 D2D传输的最大 发射功率。
可选地, 作为一个实施例, 第二发送单元 54具体用于: 向第一用户设 备发送最大发射功率, 使得第一用户设备执行 D2D传输的发射功率小于最 大发射功率。
可选地, 作为一个实施例, 确定单元 53还可以具体用于: 根据上行导 频信号的信号接收强度和预设的干扰承受门限, 确定 D2D传输是否对第三 用户设备造成上行干扰, 其中干扰承受门限为基站 50 能够容忍的接收到 D2D传输的最大接收功率; 当上行导频信号的信号接收强度大于或者等于干 扰承受门限时, 确定第一用户设备执行 D2D传输的发射功率的降低量。 具 体地, 当上行导频信号的发射功率与实际 D2D数据传输的发送功率基本相
同时, 例如, 采用解调参考信号 DMRS 作为上行导频信号时, 可以直接将 该上行导频信号的接收强度作为 D2D传输对于普通用户设备上行信号的干 扰强度。
可选地, 作为一个实施例, 第二发送单元 54具体用于: 向第一用户设 备发送 D2D传输的发射功率的降低量, 以使得第一用户设备执行 D2D传输 的发射功率降低至干扰承受门限以下。
可选地,作为一个实施例,上行导频信号包括探测参考信号 SRS或解调 参考信号 DMRS。
本发明实施例通过基站 50测量上行导频信号, 来估计 D2D传输对于正 常用户设备的上行传输所带来的干扰, 并通过基站 50将 D2D传输的功率上 限或者发射功率降低命令发送给执行 D2D传输的用户设备, 以限制 D2D传 输对普通用户设备上行信号的干扰, 从而将 D2D传输带来的干扰控制在可 接受的范围内。
图 6是本发明一个实施例的用户设备的示意框图。 图 6的用户设备 60 包括第一接收单元 61、 配置单元 62、 发送单元 63和第二接收单元 64。
第一接收单元 61接收基站发送的上行导频资源配置信息。 配置单元 62 根据上行导频资源配置信息配置上行导频信号。 发送单元 63发送配置单元 配置的上行导频信号, 以便于基站根据上行导频信号的接收强度确定功率控 制信息, 其中上行导频信号的信号的接收强度指示用户设备 60和第二用户 设备执行设备到设备 D2D传输对第三用户设备和基站间的上行传输造成的 干扰。 第二接收单元 64接收基站发送的功率控制信息。
本发明实施例通过使得基站根据上行导频信号的接收强度确定功率控 制信息, 以控制用户设备 60执行 D2D传输的发送功率, 从而解决了 D2D 传输对普通用户设备上行信号的干扰。
可选地, 作为一个实施例, 上行导频资源配置信息可以包括以下至少一 种: 上行导频信号占用的时频资源; 上行导频信号的导频序列; 上行导频信 号的发射功率。 上行导频资源配置信息可以是由基站预先配置的, 用于指示 用户设备 60在特定的时频资源上釆用特定的导频序列以特定的发射功率发 送上行导频信号。
可选地,作为一个实施例,上行导频信号包括探测参考信号 SRS或解调 参考信号 DMRS。
可选地, 用户设备 60接收基站发送的功率控制信息, 并根据该功率控 制信息进行 D2D传输的发射功率调整。当功率控制信息包括基站确定的 D2D 传输的最大发射功率时, 用户设备 60确保 D2D传输的发射功率小于该最大 发射功率。 当功率控制信息包括 D2D传输的发射功率的降低量时, 用户设 备 60根据该降低量调整当前的 D2D传输发射功率。
本发明实施例通过基站测量上行导频信号, 来估计 D2D传输对于正常 用户设备的上行传输所带来的干扰, 并通过基站将 D2D传输的功率上限或 者发射功率降低命令发送给执行 D2D传输的用户设备, 以限制 D2D传输对 普通用户设备上行信号的干扰, 从而将 D2D传输带来的干扰控制在可接受 的范围内。
根据本发明实施例的通信系统可包括上述用户设备 60或基站 50。
图 Ί是本发明另一实施例的基站的示意框图。 图 7的基站 70包括存储 器 71、 处理器 72、 发射电路 73和天线 74。
存储器 71存储使得处理器 72执行以下操作的指令: 第一用户设备发送 上行导频资源配置信息; 接收第一用户设备跟据上行导频资源配置信息配置 并发送的上行导频信号; 根据上行导频信号的接收强度确定功率控制信息, 其中上行导频信号的信号的接收强度指示第一用户设备和第二用户设备执 行设备到设备 D2D传输对第三用户设备和基站间的上行传输造成的干扰; 向第一用户设备发送功率控制信息。
本发明实施例通过使得基站 70根据上行导频信号的接收强度确定功率 控制信息,以控制第一用户设备执行 D2D传输的发送功率,从而解决了 D2D 传输对普通用户设备上行信号的干扰。
此外, 基站 70还可以包括接收电路 75等。 处理器 72控制基站 70的操 作, 处理器 72还可以称为 CPU ( Central Processing Unit, 中央处理单元)。 存储器 71可以包括只读存储器和随机存取存储器, 并向处理器 72提供指令 和数据。 存储器 71 的一部分还可以包括非易失性随机存取存储器 ( NVRAM )。 具体的应用中, 发射电路 73和接收电路 75可以耦合到天线 74。 基站 70的各个组件通过总线系统 77耦合在一起, 其中总线系统 77除 包括数据总线之外, 还可以包括电源总线、 控制总线和状态信号总线等。 但 是为了清楚说明起见, 在图中将各种总线都标为总线系统 77。
上述本发明实施例揭示的方法可以应用于处理器 72 中, 或者由处理器
72实现。 处理器 72可能是一种集成电路芯片, 具有信号的处理能力。 在实 现过程中, 上述方法的各步骤可以通过处理器 72 中的硬件的集成逻辑电路 或者软件形式的指令完成。 上述的处理器 72可以是通用处理器、 数字信号 处理器 (DSP )、 专用集成电路(ASIC )、 现成可编程门阵列 (FPGA ) 或者 其他可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件。 可以实 现或者执行本发明实施例中的公开的各方法、 步骤及逻辑框图。 通用处理器 可以是微处理器或者该处理器也可以是任何常规的处理器等。 结合本发明实 施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成, 或者用 译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储 器, 闪存、 只读存储器, 可编程只读存储器或者电可擦写可编程存储器、 寄 存器等本领域成熟的存储介质中。 该存储介质位于存储器 71, 处理器 72读 取存储器 71中的信息, 结合其硬件完成上述方法的步骤。
可选地, 作为一个实施例, 处理器 71具体用于才艮据上行导频信号的信 号接收强度和上行导频信号的发射功率,确定第一用户设备与基站间的路径 损耗; 并根据路径损耗和预设的干扰承受门限, 确定第一用户设备执行 D2D 传输的最大发射功率, 其中干扰承受门限为基站 70能够容忍的接收到 D2D 传输的最大接收功率。
可选地, 作为一个实施例, 处理器 71还具体用于才艮据上行导频信号的 信号接收强度和预设的干扰承受门限, 确定 D2D传输是否对第三用户设备 造成上行干扰, 其中干扰承受门限为基站 70能够容忍的接收到 D2D传输的 最大接收功率; 当上行导频信号的信号接收强度大于或者等于干扰承受门限 时, 确定第一用户设备执行 D2D传输的发射功率的降低量。
可选地, 上行导频信号包括探测参考信号 SRS或解调参考信号 DMRS。 本发明实施例中, 基站 70可执行图 1至图 4的基站执行的方法, 本发 明在此不再赘述。
图 8是本发明另一实施例的用户设备的示意框图。 图 8的用户设备 80 包括处理器 81和存储器 82。 处理器 81和存储器 82通过总线系统 83相连。
存储器 82用于存储使得处理器 81执行以下操作的指令: 接收基站发送 的上行导频资源配置信息; 根据上行导频资源配置信息配置并发送上行导频 信号, 以便于基站根据上行导频信号的接收强度确定功率控制信息, 其中上 行导频信号的信号的接收强度指示用户设备 80和第二用户设备执行设备到
设备 D2D传输对第三用户设备和基站间的上行传输造成的干扰; 接收基站 发送的功率控制信息。
本发明实施例通过使得基站根据上行导频信号的接收强度确定功率控 制信息, 以控制用户设备 80执行 D2D传输的发送功率, 从而解决了 D2D 传输对普通用户设备上行信号的干扰。
此外,用户设备 80还可以包括发射电路 84、接收电路 85及天线 86等。 处理器 81 控制用户设备 80的操作, 处理器 81还可以称为 CPU ( Central Processing Unit, 中央处理单元)。 存储器 82可以包括只读存储器和随机存 取存储器, 并向处理器 81提供指令和数据。 存储器 82的一部分还可以包括 非易失性随机存取存储器 ( NVRAM )。 具体的应用中, 发射电路 84和接收 电路 88可以耦合到天线 86。 用户设备 80的各个组件通过总线系统 83耦合 在一起, 其中总线系统 83 除包括数据总线之外, 还可以包括电源总线、 控 制总线和状态信号总线等。 但是为了清楚说明起见, 在图中将各种总线都标 为总线系统 83。
上述本发明实施例揭示的方法可以应用于处理器 81 中, 或者由处理器
81实现。 处理器 81可能是一种集成电路芯片, 具有信号的处理能力。 在实 现过程中, 上述方法的各步骤可以通过处理器 81 中的硬件的集成逻辑电路 或者软件形式的指令完成。 上述的处理器 81 可以是通用处理器、 数字信号 处理器 (DSP )、 专用集成电路(ASIC )、 现成可编程门阵列 (FPGA ) 或者 其他可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件。 可以实 现或者执行本发明实施例中的公开的各方法、 步骤及逻辑框图。 通用处理器 可以是微处理器或者该处理器也可以是任何常规的处理器等。 结合本发明实 施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成, 或者用 译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储 器, 闪存、 只读存储器, 可编程只读存储器或者电可擦写可编程存储器、 寄 存器等本领域成熟的存储介质中。 该存储介质位于存储器 82, 处理器 81读 取存储器 82中的信息, 结合其硬件完成上述方法的步骤。
可选地, 作为一个实施例, 上行导频资源配置信息可以包括以下至少一 种: 上行导频信号占用的时频资源; 上行导频信号的导频序列; 上行导频信 号的发射功率。 上行导频资源配置信息可以是由基站预先配置的, 用于指示 第一用户设备在特定的时频资源上采用特定的导频序列以特定的发射功率
发送上行导频信号。
可选地, 上行导频信号包括探测参考信号 SRS或解调参考信号 DMRS。 可选地, 用户设备 80接收基站发送的功率控制信息, 并根据该功率控 制信息进行 D2D传输的发射功率调整。当功率控制信息包括基站确定的 D2D 传输的最大发射功率时, 用户设备 80确保 D2D传输的发射功率小于该最大 发射功率。 当功率控制信息包括 D2D传输的发射功率的降低量时, 用户设 备 80根据该降低量调整当前的 D2D传输发射功率。
本发明实施例中,用户设备 80可执行图 2至图 4的第一用户设备( UE1 ) 执行的方法, 本发明在此不再赘述。
本领域普通技术人员可以意识到, 结合本文中所公开的实施例中描述的 各方法步骤和单元, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性 地描述了各实施例的步骤及组成。 这些功能究竟以硬件还是软件方式来执 行, 取决于技术方案的特定应用和设计约束条件。 本领域普通技术人员可以 对每个特定的应用来使用不同方法来实现所描述的功能, 但是这种实现不应 认为超出本发明的范围。
结合本文中所公开的实施例描述的方法或步骤可以用硬件、 处理器执行 的软件程序,或者二者的结合来实施。软件程序可以置于随机存储器( RAM )、 内存、 只读存储器 (ROM )、 电可编程 ROM、 电可擦除可编程 ROM、 寄存 器、 硬盘、 可移动磁盘、 CD-ROM、 或技术领域内所公知的任意其它形式的 存储介质中。
尽管通过参考附图并结合优选实施例的方式对本发明进行了详细描述, 但本发明并不限于此。 在不脱离本发明的精神和实质的前提下, 本领域普通 技术人员可以对本发明的实施例进行各种等效的修改或替换, 而这些修改或 替换都应在本发明的涵盖范围内。
Claims
1.一种避免 D2D传输造成上行干扰的方法, 其特征在于, 包括: 基站向第一用户设备发送上行导频资源配置信息;
所述基站接收所述第一用户设备跟据所述上行导频资源配置信息配置 并发送的上行导频信号;
所述基站根据所述上行导频信号的接收强度确定功率控制信息, 其中所 述上行导频信号的信号的接收强度指示所述第一用户设备和第二用户设备 执行设备到设备 D2D传输对第三用户设备和所述基站间的上行传输造成的 干扰;
所述基站向所述第一用户设备发送所述功率控制信息。
2. 根据权利要求 1 所述的方法, 其特征在于, 所述上行导频资源配置 信息包括以下至少一种:
所述上行导频信号占用的时频资源;
所述上行导频信号的导频序列;
所述上行导频信号的发射功率。
3. 根据权利要求 2所述的方法,其特征在于, 所述根据所述上行导频信 号的信号接收强度确定功率控制信息, 包括:
根据所述上行导频信号的信号接收强度和所述上行导频信号的发射功 率, 确定所述第一用户设备与基站间的路径损耗;
根据所述路径损耗和预设的干扰承受门限, 确定所述第一用户设备执行
D2D传输的最大发射功率,其中所述干扰承受门限为所述基站能够容忍的接 收到所述 D2D传输的最大接收功率。
4. 根据权利要求 3所述的方法,其特征在于, 所述向所述第一用户设备 发送所述功率控制信息包括: 向所述第一用户设备发送所述最大发射功率, 使得所述第一用户设备执行 D2D传输的发射功率小于所述最大发射功率。
5. 根据权利要求 2所述的方法,其特征在于, 所述根据所述上行导频信 号的信号接收强度确定功率控制信息, 包括:
根据所述上行导频信号的信号接收强度和预设的干扰承受门限,确定所 述 D2D传输是否对所述第三用户设备造成上行干扰, 其中所述干扰承受门 限为所述基站能够容忍的接收到所述 D2D传输的最大接收功率;
当所述上行导频信号的信号接收强度大于或者等于所述干扰承受门限
时, 确定所述第一用户设备执行 D2D传输的发射功率的降低量。
6. 根据权利要求 5所述的方法,其特征在于, 所述向所述第一用户设备 发送所述功率控制信息包括: 向所述第一用户设备发送所述 D2D传输的发 射功率的降低量, 以使得所述第一用户设备执行 D2D传输的发射功率降低 至所述干护 ^?受门限以下。
7. 根据权利要求 1至 6中任意一项所述的方法, 其特征在于, 所述上行 导频信号包括探测参考信号 SRS或解调参考信号 DMRS。
8. 一种避免 D2D传输造成上行干扰的方法, 其特征在于, 包括: 第一用户设备接收基站发送的上行导频资源配置信息;
所述第一用户设备根据所述上行导频资源配置信息配置并发送上行导 频信号, 以便于所述基站根据所述上行导频信号的接收强度确定功率控制信 息, 其中所述上行导频信号的信号的接收强度指示所述第一用户设备和第二 用户设备执行设备到设备 D2D传输对第三用户设备和所述基站间的上行传 输造成的干扰;
所述第一用户设备接收所述基站发送的所述功率控制信息。
9. 根据权利要求 8所述的方法, 其特征在于, 所述上行导频资源配置 信息包括以下至少一种:
所述上行导频信号占用的时频资源;
所述上行导频信号的导频序列;
所述上行导频信号的发射功率。
10. 根据权利要求 8或 9中所述的方法, 其特征在于, 所述上行导频信 号包括探测参考信号 SRS或解调参考信号 DMRS。
11. 一种基站, 其特征在于, 包括:
第一发送单元, 用于向第一用户设备发送上行导频资源配置信息; 接收单元, 用于接收所述第一用户设备跟据所述上行导频资源配置信息 配置并发送的上行导频信号;
确定单元, 用于根据所述上行导频信号的接收强度确定功率控制信息, 其中所述上行导频信号的信号的接收强度指示所述第一用户设备和第二用 户设备执行设备到设备 D2D传输对第三用户设备和所述基站间的上行传输 造成的干扰;
第二发送单元, 用于向所述第一用户设备发送所述功率控制信息。
12. 根据权利要求 11 所述的基站, 其特征在于, 所述第一发送单元发 送的上行导频资源配置信息包括以下至少一种:
所述上行导频信号占用的时频资源;
所述上行导频信号的导频序列;
所述上行导频信号的发射功率。
13. 根据权利要求 12所述的基站,其特征在于,所述确定单元具体用于: 根据所述上行导频信号的信号接收强度和所述上行导频信号的发射功 率, 确定所述第一用户设备与基站间的路径损耗;
根据所述路径损耗和预设的干扰承受门限, 确定所述第一用户设备执行 D2D传输的最大发射功率,其中所述干扰承受门限为所述基站能够容忍的接 收到所述 D2D传输的最大接收功率。
14. 根据权利要求 13所述的基站, 其特征在于, 所述第二发送单元具体 用于: 向所述第一用户设备发送所述最大发射功率, 使得所述第一用户设备 执行 D2D传输的发射功率小于所述最大发射功率。
15. 根据权利要求 12所述的基站,其特征在于,所述确定单元具体用于: 根据所述上行导频信号的信号接收强度和预设的干扰承受门限,确定所 述 D2D传输是否对所述第三用户设备造成上行干扰, 其中所述干扰承受门 限为所述基站能够容忍的接收到所述 D2D传输的最大接收功率;
当所述上行导频信号的信号接收强度大于或者等于所述干扰承受门限 时, 确定所述第一用户设备执行 D2D传输的发射功率的降低量。
16. 根据权利要求 15所述的基站, 其特征在于, 所述第二发送单元具体 用于: 向所述第一用户设备发送所述 D2D传输的发射功率的降低量, 以使 得所述第一用户设备执行 D2D传输的发射功率降低至所述干扰承受门限以 下。
17. 根据权利要求 11至 16中任意一项所述的基站, 其特征在于, 所述 上行导频信号包括探测参考信号 SRS或解调参考信号 DMRS。
18.一种用户设备, 其特征在于, 包括:
第一接收单元, 用于接收基站发送的上行导频资源配置信息; 配置单元, 用于根据所述上行导频资源配置信息配置上行导频信号; 发送单元, 用于发送所述配置单元配置的上行导频信号, 以便于所述基 站根据所述上行导频信号的接收强度确定功率控制信息, 其中所述上行导频
信号的信号的接收强度指示所述第一用户设备和第二用户设备执行设备到 设备 D2D传输对第三用户设备和所述基站间的上行传输造成的干扰;
第二接收单元, 用于接收所述基站发送的所述功率控制信息。
19. 根据权利要求 18所述的用户设备, 其特征在于, 所述上行导频资 源配置信息包括以下至少一种:
所述上行导频信号占用的时频资源;
所述上行导频信号的导频序列;
所述上行导频信号的发射功率。
20. 根据权利要求 18或 19中所述的用户设备, 其特征在于, 所述上行 导频信号包括探测参考信号 SRS或解调参考信号 DMRS。
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