# US 2019/0319656 A1 · Passive Intermodulation Suppression Method and Passive Intermodulation Suppression System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0319656 A1 - Document ID: US20190319656A1 - Status: Published application - Kind: A1 - Application number: 16/454,225 - Filed: 2019-06-27 - Published: 2019-10-17 - Earliest claimed: 2016-12-29 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Lanping Gong; Lianghong Xiang; Weihong Xiao - Web page: https://patentgrep.com/patent/US20190319656A1 ## CPC - H04B 1/12: Neutralising, balancing, or compensation arrangements - H04B 1/525: with means for reducing leakage of transmitter signal into the receiver - H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference - H04B 1/1027: {assessing signal quality or detecting noise/interference for the received signal} - H04W 88/08: Access point devices - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of the present application disclose a passive intermodulation suppression method and a passive intermodulation suppression system. The method in the embodiments of the present application includes: obtaining, by using a target uplink controllable gain module, a first power Pt of an uplink signal sent by an antenna; obtaining a second power Pb of a signal that is output from an output port of a base station; configuring a target attenuation of the base station; and adjusting the initial gain value based on the target attenuation to keep a gain of the base station constant. According to the method described in the embodiments, the base station can maintain the target attenuation constant in a process of adjusting a gain of the target uplink controllable gain module, thereby reducing a PIM requirement of a passive intermodulation suppression system. ## Claims ### Claim 1 A passive intermodulation suppression method, comprising: obtaining, by using a target uplink controllable gain module, a first power Pt of an uplink signal sent by an antenna, wherein at least one uplink controllable gain module is disposed between a base station and the antenna, and the target uplink controllable gain module is any one of the at least one uplink controllable gain module; obtaining a second power Pb of a signal that is output from an output port of the base station; configuring a target attenuation of the base station, wherein the target attenuation IL=G0−(Pb−Pt), wherein G0 is an initial gain value of the target uplink controllable gain module; and adjusting the initial gain value based on the target attenuation to keep a gain of the base station constant. ### Claim 2 (depends on 1) The method according to claim 1, wherein after the configuring a target attenuation of the base station, the method further comprises: if the base station is currently in a downlink no-load state, obtaining a first received total wideband power (RTWP) of an uplink of the base station; and obtaining a second RTWP of the uplink of the base station, wherein the second RTWP is an RTWP that is used when target load is loaded onto a downlink of the base station, and the target load is less than or equal to a preset threshold. ### Claim 3 (depends on 2) The method according to claim 2, wherein the adjusting the initial gain value based on the target attenuation comprises: if the first RTWP is less than the second RTWP, generating first instruction information, wherein the first instruction information is used to instruct the target uplink controllable gain module to increase the initial gain value G0 by step measured in target preset amounts; and sending the first instruction information to the target uplink controllable gain module. ### Claim 4 (depends on 3) The method according to claim 3, wherein after the sending the first instruction information to the target uplink controllable gain module, the method further comprises: controlling the base station to attenuate the gain of the base station by step measured in the target preset amounts, to keep the gain of the base station constant. ### Claim 5 (depends on 3) The method according to claim 3, wherein after the adjusting the initial gain value based on the target attenuation, the method further comprises: determining whether an absolute value of a difference between the first RTWP and the second RTWP is less than or equal to a preset value; if determining that the absolute value of the difference between the first RTWP and the second RTWP is less than or equal to the preset value, generating second instruction information, wherein the second instruction information is used to instruct the target uplink controllable gain module no longer to adjust a gain value; and sending the second instruction information to the target uplink controllable gain module. ### Claim 6 (depends on 3) The method according to any claim 3, wherein after the adjusting the initial gain value based on the target attenuation, the method further comprises: obtaining a current gain value GT of the target uplink controllable gain module; determining whether the current gain value GT is equal to a preset maximum gain value; if determining that the current gain value GT is equal to the preset maximum gain value, generating third instruction information, wherein the third instruction information is used to instruct the target uplink controllable gain module no longer to adjust the current gain value GT; and sending the third instruction information to the target uplink controllable gain module. ### Claim 7 (depends on 2) The method according to claim 2, wherein the adjusting the initial gain value based on the target attenuation comprises: if the first RTWP is equal to the second RTWP, generating fourth instruction information, wherein the fourth instruction information is used to instruct the target uplink controllable gain module not to adjust the initial gain value G0; and sending the fourth instruction information to the target uplink controllable gain module. ### Claim 8 A passive intermodulation suppression system, comprising a base station and an antenna, wherein at least one uplink controllable gain module is disposed between the base station and the antenna, the antenna is connected to a target uplink controllable gain module, the target uplink controllable gain module is any one of the at least one uplink controllable gain module, and the target uplink controllable gain module is further connected to the base station; and the base station is configured to: obtaining, by using a target uplink controllable gain module, a first power Pt of an uplink signal sent by an antenna, wherein at least one uplink controllable gain module is disposed between a base station and the antenna, and the target uplink controllable gain module is any one of the at least one uplink controllable gain module; obtaining a second power Pb of a signal that is output from an output port of the base station; configuring a target attenuation of the base station, wherein the target attenuation IL=G0−(Pb−Pt), wherein G0 is an initial gain value of the target uplink controllable gain module; and adjusting the initial gain value based on the target attenuation to keep a gain of the base station constant. ### Claim 9 (depends on 8) The passive intermodulation suppression system according to claim 8, wherein the system further comprises a first jumper, a second jumper, a third jumper, and a feeder; and the target uplink controllable gain module is connected to the antenna by using the first jumper, the target uplink controllable gain module is connected to the feeder by using the second jumper, and the base station is connected to the feeder by using the third jumper. ### Claim 10 (depends on 8) The passive intermodulation suppression system according to claim 8, wherein the target uplink controllable gain module comprises an output transmit band-pass filter, a receive prefilter, a receive postfilter, a power detection module, a controllable attenuator, a low noise amplifier, a base-station-side port, and an antenna-side port; the antenna-side port is connected to a first end of the output transmit band-pass filter, the antenna-side port is further connected to a first end of the receive prefilter, a second end of the output transmit band-pass filter is connected to the base-station-side port, a second end of the receive prefilter is connected to an input end of the low noise amplifier by using a first RF switch, an output end of the low noise amplifier is connected to a first end of the controllable attenuator by using a second RF switch, a second end of the controllable attenuator is connected to a first end of the receive postfilter, and a second end of the receive postfilter is connected to the base-station-side port; and the receive prefilter is configured to separate an uplink signal coupled from an antenna, the low noise amplifier is configured to amplify the uplink signal, the controllable attenuator is configured to control a gain of an amplified uplink signal, the receive postfilter is configured to filter an uplink signal obtained through gain control, the receive postfilter is configured to combine a downlink signal and an uplink signal at the base-station-side port, and the power detection module is configured to detect a downlink power. ### Claim 11 (depends on 8) The passive intermodulation suppression system according to claim 8, wherein the target uplink controllable gain module is integrated into a tower-mounted amplifier TMA, a combiner, a splitter, or the antenna. ### Claim 12 A passive intermodulation suppression system, comprising a base station and an antenna, wherein at least one uplink controllable gain module is disposed between the base station and the antenna, the antenna is connected to a target uplink controllable gain module, the target uplink controllable gain module is any one of the at least one uplink controllable gain module, the target uplink controllable gain module is further connected to the base station, and a passive intermodulation suppression control module is disposed between the base station and the target uplink controllable gain module; and the passive intermodulation suppression control module is configured to: obtaining, by using a target uplink controllable gain module, a first power Pt of an uplink signal sent by an antenna, wherein at least one uplink controllable gain module is disposed between a base station and the antenna, and the target uplink controllable gain module is any one of the at least one uplink controllable gain module; obtaining a second power Pb of a signal that is output from an output port of the base station; configuring a target attenuation of the base station, wherein the target attenuation IL=G0−(Pb−Pt), wherein G0 is an initial gain value of the target uplink controllable gain module; and adjusting the initial gain value based on the target attenuation to keep a gain of the base station constant. ### Claim 13 (depends on 12) The passive intermodulation suppression system according to claim 12, wherein the passive intermodulation suppression control module is further configured to: if the base station is currently in a downlink no-load state, obtaining a first received total wideband power (RTWP) of an uplink of the base station; and obtaining a second RTWP of the uplink of the base station, wherein the second RTWP is an RTWP that is used when target load is loaded onto a downlink of the base station, and the target load is less than or equal to a preset threshold.