CN113727432A - Method for measuring positioning information of user equipment based on wave beam of single 5G base station - Google Patents

Abstract

A method for measuring user equipment positioning information based on a single 5G base station beam divides a coverage area of a 5G base station cell into a plurality of areas, when a user terminal is located at any position in the areas, the 5G base station transmits a group of reference beams, the user terminal is matched with the 5G base station to identify the reference beams, a group of best matching beams is selected from the reference beams and continuously transmits an updating signal, and finally the 5G base station estimates and positions user position information.

Description

Method for measuring positioning information of user equipment based on wave beam of single 5G base station

Technical Field

The invention relates to the technical field of mobile communication, in particular to a method for improving the acquisition method of positioning information of a current gNB for a mobile user, and a method for measuring the positioning information of user equipment based on a beam of a single 5G base station.

Background

5G defines three application scenarios: enhanced mobile broadband (eMBB), large-scale Internet of things (mMTC), and low-latency high-reliability communication (uRLLC). The eMBB mainly pursues the extremely-person communication experience and corresponds to high-flow mobile broadband services such as 3D/ultra-high definition video and the like; the mMTC mainly reflects the communication requirements of objects and things, and is applied to smart cities, smart homes, wearable equipment and other scenes which aim at sensing and data acquisition; the uRLLC is oriented to applications such as automatic driving, mobile medical treatment and the like with extremely high requirements on time delay and reliability. In order to achieve the goal of 5G design, an Ultra Dense Networking (UDN) technology can achieve a huge increase in frequency reuse efficiency and a thousand-fold capacity increase in a local hot spot region by deploying a large number of low-power and low-cost base stations in a macro cell. However, the increase of the cell deployment density will result in more frequent handover and higher handover rate, and in order to ensure service continuity, optimizing the acquisition manner of the positioning information of the 5G base station (gNB) for the user becomes a key point for solving the handover problem.

Aiming at the limitation of the positioning method used by the current base station, the design provides a more optimized scheme, and the beam tracking is used for measuring the positioning information of the user equipment without the cooperation of a GPS and a sensor technology.

Disclosure of Invention

Most of the traditional user positioning methods need to simultaneously cooperate and calculate the coordinates of a positioning object among a plurality of base stations, and in order to solve the technical problems, the invention provides a method for measuring the positioning information of user equipment based on the wave beams of a single 5G base station.

In order to realize the technical purpose, the adopted technical scheme is as follows: a method for measuring user equipment positioning information based on beams of a single 5G base station divides a coverage area of a 5G base station cell into a plurality of areas, when a user terminal is located at any position in the areas, the 5G base station transmits a group of reference beams, the user terminal is matched with the 5G base station to identify the reference beams, a group of best matching beams are selected from the reference beams, an updating signal is continuously transmitted, and finally the 5G base station estimates and positions the user position information, which comprises the following steps:

firstly, dividing a cell coverage area of a 5G base station into different areas, and allocating antennas capable of estimating departure angles and arrival angles; the area division information and the position coordinate information of the 5G base station are obtained in advance in the deployment/configuration process of the 5G base station;

step two, when the user terminal enters the arbitrary coverage area of the 5G base station, the 5G base station can transmit a group of transmitting beams to the user terminal, the user terminal identifies the optimal receiving beam of the transmitting beams by using the received area division information and the position coordinate information of the 5G base station, measures CSI related parameters of each transmitting beam and receiving beam pair in an uplink channel and reports the CSI related parameters to the 5G base station;

step three, the 5G base station selects the optimal transmitting beam and receiving beam pair according to CSI related parameters and link information self-adaptive adjustment information sent by the user terminal, so that the position of the current user terminal in the area can be preliminarily determined, and the UE uses the reference position from the gNB to continuously update the channel state information through the initial position;

and step four, the 5G base station estimates the position of the user terminal through the departure angle and the arrival angle, and the position estimation is combined with the position estimation preliminarily obtained based on the region division information, and the information of 'CQI + position + speed + direction' updated by the user terminal is periodically fed back to the 5G base station through a PUCCH, and is matched with the 5G base station to complete accurate positioning.

The invention has the beneficial effects that: the user position can be independently positioned by processing signals through one gNB without the cooperation of a plurality of base stations. The positioning accuracy is improved to 10-20 cm, and the energy efficiency of the mobile user equipment is improved. In addition, the proposed multi-beam tracking and positioning method can also improve system outage probability performance or SEP (standard error prediction) for future millimeter wave applications in 5G networks.

Drawings

Fig. 1 is a schematic diagram of a gbb cell division of the present invention;

fig. 2 is a diagram of the transmit and receive beams of the gNB and the UE according to the present invention;

fig. 3 is a schematic diagram illustrating communication interaction between a UE and a gNB according to the present invention;

fig. 4 is a table of information that the gNB receives and updates the UE according to the present invention;

FIG. 5 is a table of uplink control information according to the present invention;

fig. 6 is a signaling interaction flow between the UE and the gNB according to the present invention;

FIG. 7 is a graph comparing the performance of the method of the present invention with other embodiments.

Detailed Description

The process of the present invention is further illustrated below with reference to specific examples.

As shown in fig. 1, a method for measuring positioning information of a UE based on beams of a single 5G base station divides a coverage area of a gNB cell into a plurality of areas, a UE identifies a related optimal transmit and receive beam pair in the areas in cooperation with the gNB and continuously transmits updated information, and the gNB estimates area information and combines a DoA/AoA kalman filter to fuse the area information into a location estimate of a mobile user for positioning, which specifically includes:

(1) the location information of the gNB is known and equipped with antennas that can perform DoA and AoA estimation, and then the cell covered by it is divided into multiple areas (as shown in fig. 1). The partitioning information is available at the gbb from the start of the deployment process of the gbb, and the region size may be static or dynamic. The location information will be estimated by the gNB when the mobile user is located anywhere within one of these areas.

(2) When a mobile user (user terminal) enters its area, the gNB transmits reference signals, CSI-RSs and synchronization signals in a set of transmit beams (TX 1, TX2, TX3, TX4 as shown in fig. 2), which have certain beam width, direction and location information (i.e., location coordinates of DoA, AoA and gNB). The mobile user uses these reference signals to identify the best receive beam associated with each transmit beam (TX 1, …, TX 4); a mobile user may have a set of receive beams (e.g., RX beams RX1, RX2, RX3 of fig. 2) that are detected by the gNB to be within line of sight, and the LoS detection scheme may be based on the rice factor of the Received Signal Strength (RSS). And the mobile user reports the CSI related parameters of each transmitting beam and receiving beam pair measured in the uplink channel to the gNB, judges all groups of receiving beams received by the mobile user and selects the best receiving beam.

(3) After selecting the best transmit beam and the best receive beam pair, the gNB may then preliminarily determine the current mobile user location in the area and inform the mobile user of its location in the area through the corresponding transmit beam. The mobile user can use the reference position from the gNB to feed back its position, speed, and direction to the gNB at an appropriate time (the mobile user can feed back information to the gNB when feeding back information to the gNB or communicating with the gNB). The gNB may also obtain other parameters, such as its location (GPS), position, speed, direction, etc., through sensors in the mobile user, and implement the movement prediction of the mobile user for more accurate positioning. Fig. 3 shows a schematic diagram of communication interaction between a mobile user and a gNB, and fig. 4 shows a schematic diagram of data table update performed by the gNB according to channel state information (CQI + speed + position + direction) of the mobile user.

(4) And (4) the gNB estimates the position information of the UE through the DoA and the AoA of the uplink signals, and fuses the position information into the preliminary position estimation in the step (3) by combining the DoA/AoA Kalman filter. The UE may feedback information such as "CQI + velocity + position + direction" to the gNB via PUCCH report in uplink signaling, where the feedback is sent periodically (e.g. every 5-10 ms) or aperiodically based on triggering, as shown in fig. 6, the signaling interaction flow between the mobile user and the gNB in the multi-beam positioning method proposed by the present invention.

As shown in fig. 7, the present application compares with various acquisition manners of positioning information, which are TDoA, AoA, TDoA + AoA, respectively, and the method of the present invention is TDoA + AoA BroadBand, and the positioning accuracy (Y coordinate axis, unit is m) of the method of the present invention increases to 10-20 cm along with the increase of time, which is obviously higher than the acquisition manners of other positioning information.

Claims (1)

1. The method for measuring the positioning information of the user equipment based on the wave beam of the single 5G base station is characterized in that: dividing the coverage area of a 5G base station cell into a plurality of areas, when a user terminal is located at any position in the areas, transmitting a group of reference beams by the 5G base station, matching the user terminal with the 5G base station to identify the reference beams, selecting a group of best matching beams from the reference beams, continuously sending an updating signal, and finally estimating and positioning user position information by the 5G base station, wherein the specific method comprises the following steps:

firstly, dividing a cell coverage area of a 5G base station into different areas, and allocating antennas capable of estimating departure angles and arrival angles; the area division information and the position coordinate information of the 5G base station are obtained in advance in the deployment/configuration process of the 5G base station;

step two, when the user terminal enters the arbitrary coverage area of the 5G base station, the 5G base station can transmit a group of transmitting beams to the user terminal, the user terminal identifies the optimal receiving beam of the transmitting beams by using the received area division information and the position coordinate information of the 5G base station, measures CSI related parameters of each transmitting beam and receiving beam pair in an uplink channel and reports the CSI related parameters to the 5G base station;

step three, the 5G base station selects the optimal transmitting beam and the optimal receiving beam pair according to the CSI related parameters and the link information self-adaptive adjustment information sent by the user terminal, so that the position of the current user terminal in the area can be preliminarily determined, and the UE uses the reference position from the gNB to continuously update the channel state information through the initial position;

and step four, the 5G base station estimates the position of the user terminal through the departure angle and the arrival angle, and the position estimation is combined with the position estimation preliminarily obtained based on the region division information, and the information of 'CQI + position + speed + direction' updated by the user terminal is periodically fed back to the 5G base station through a PUCCH, and is matched with the 5G base station to complete accurate positioning.

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