Terminal positioning method and baseband unit

A terminal positioning method, wherein the method is applied to a baseband unit (BBU) in an indoor distributed NodeB system, and the method comprises:

• receiving an uplink positioning signal forwarded by multiple remote radio units (RRUs), wherein the uplink positioning signal is sent by a to-be-positioned terminal to the multiple RRUs;
• selecting, from the multiple RRUs, at least two RRUs as target RRUs according to the uplink positioning signal and a physical distance, wherein selecting comprises:
• separately obtaining, according to the uplink positioning signal, a signal strength of the uplink positioning signal received by each of the multiple RRUs and channel state information of a channel from the to-be-positioned terminal to the multiple RRUs;
• and
• selecting the at least two RRUs as the target RRUs in response to determining that the physical distance between every two of the at least two RRUs is greater than a first preset value, a signal strength of the uplink positioning signal received by each of the at least two RRUs is greater than a second preset value, and a channel correlation coefficient between channel state information of every two of the at least two RRUs is less than a third preset value;
• and
• respectively obtaining signal angles of arrival corresponding to the target RRUs, and determining a location of the to-be-positioned terminal according to the signal angles of arrival, locations of the target RRUs, and a preset algorithm.

A baseband unit in an indoor distributed NodeB system, wherein the baseband unit comprises:

• a receiver, configured to receive an uplink positioning signal forwarded by multiple remote radio units (RRUs), wherein the uplink positioning signal is sent by a to-be-positioned terminal to the multiple RRUs;
• a non-transitory memory storage comprising instructions;
• and
• one or more hardware processors in communication with the memory storage, wherein the one or more hardware processors execute the instructions to:
• select, from the multiple RRUs, at least two RRUs as target RRUs according to the uplink positioning signal and a physical distance, wherein the one or more hardware processors execute the instructions to select the at least two RRUs as the target RRUs comprises the one or more hardware processors execute the instructions to:
• separately obtain, according to the uplink positioning signal, a signal strength of the uplink positioning signal received by each of the multiple RRUs;
• and
• select the at least two RRUs as the target RRUs in response to determining that the physical distance between every two of the at least two RRUs is greater than a first preset value and a signal strength of the uplink positioning signal received by each of the at least two RRUs is greater than a second preset value;
• and
• respectively obtain signal angles of arrival corresponding to the target RRUs, and determine a location of the to-be-positioned terminal according to the signal angles of arrival, locations of the target RRUs, and a preset algorithm.

A baseband unit in an indoor distributed NodeB system, wherein the baseband unit comprises:

• a receiver, configured to receive an uplink positioning signal forwarded by multiple remote radio units (RRUs), wherein the uplink positioning signal is sent by a to-be-positioned terminal to the multiple RRUs;
• a non-transitory memory storage comprising instructions;
• and
• one or more hardware processors in communication with the memory storage, wherein the one or more hardware processors execute the instructions to:
• select, from the multiple RRUs, at least two RRUs as target RRUs according to the uplink positioning signal and a physical distance, wherein the one or more hardware processors execute the instructions to select the at least two RRUs as the target RRUs comprises the one or more hardware processors execute the instructions to:
• separately obtain, according to the uplink positioning signal, a signal strength of the uplink positioning signal received by each of the multiple RRUs and channel state information of a channel from the to-be-positioned terminal to the multiple RRUs;
• and
• select the at least two RRUs as the target RRUs in response to determining that the physical distance between every two of the at least two RRUs is greater than a first preset value, a signal strength of the uplink positioning signal received by each of the at least two RRUs is greater than a second preset value, and a channel correlation coefficient between channel state information of every two of the at least two RRUs is less than a third preset value;
• and
• respectively obtain signal angles of arrival corresponding to the target RRUs, and determine a location of the to-be-positioned terminal according to the signal angles of arrival, locations of the target RRUs, and a preset algorithm.