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US-20260129614-A1 - RECEIVING RADIO NODE, RADIO DEVICE, NETWORK NODE AND METHODS FOR POSITIONING THE RADIO DEVICE

US20260129614A1US 20260129614 A1US20260129614 A1US 20260129614A1US-20260129614-A1

Abstract

A method performed by a receiving radio node for positioning a radio device is provided. The receiving radio node receives a first signal from a transmitting radio node, and measures a time of arrival of the first signal. The first signal is also received by a radio device. The receiving radio node further receives a second signal from the radio device. The second signal is the first signal that has been scattered and frequency modulated by the radio device when the first signal was received by the radio device. The receiving radio node measures a time of arrival of the second signal. The receiving radio node then calculates a Time Difference Of Arrival (TDOA) based on the measured time of arrival of the first signal and the measured time of arrival of the second sign

Inventors

  • Satyam Dwivedi
  • Jonas Medbo

Assignees

  • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date
20260507
Application Date
20251219

Claims (20)

  1. 1 . A method performed by a receiving radio node for positioning a radio device, the method comprising: receiving a first signal from a transmitting radio node, measuring a time of arrival of the first signal, receiving a second signal from the radio device, measuring a time of arrival of the second signal, and calculating a Time Difference Of Arrival, TDOA, based on the measured time of arrival of the first signal and the measured time of arrival of the second signal, wherein the calculated TDOA enables resolving the position of the radio device.
  2. 2 . The method according to claim 1 , wherein an identity of the radio device is obtained from the second signal.
  3. 3 . The method according to claim 1 , wherein the position of the radio device is resolved by calculating the position of the radio device based on the measured TDOA.
  4. 4 . The method according to claim 1 , further comprising: sending the measured TDOA to a network node.
  5. 5 . The method according to claim 1 , wherein calculating the TDOA results in an ellipse indicating the position of the radio device.
  6. 6 . The method according to claim 2 , wherein the identity of the radio device is obtained based on a modulation frequency of the second signal.
  7. 7 . A method performed by a radio device, the method comprising: receiving a first signal from a transmitting radio node, scattering the first signal and frequency modulating the scattered first signal resulting in a second signal, sending the scattered and frequency modulated second signal to one or more receiving radio nodes.
  8. 8 . The method according to claim 7 , wherein frequency modulating the scattered first signal is performed to embed the identity of the radio device.
  9. 9 . The method according to claim 8 , wherein frequency modulating the scattered first signal comprises: Doppler modulating the scattered first signal.
  10. 10 . The method according to claim 9 , wherein the radio device is configured with a different modulating frequency compared to other radio devices enabling to distinguish the radio device from the other radio devices.
  11. 11 . A receiving radio node configured to position a radio device, the receiving radio node further being configured to: receive a first signal from the transmitting radio node, measure a time of arrival of the first signal, receive a second signal from the radio device, measure a time of arrival of the second signal, and calculate a Time Difference Of Arrival, TDOA, based on the measured time of arrival of the first signal and the measured time of arrival of the second signal, wherein the calculated TDOA is adapted to enable resolve the position of the radio device.
  12. 12 . The receiving radio node according to claim 11 , further being configured to obtain an identity of the radio device from the second signal.
  13. 13 . The receiving radio node according to claim 11 , further being configured to resolve the position of the radio device by calculating the position of the radio device based on the measured TDOA.
  14. 14 . The receiving radio node according to claim 11 , further being configured to send the measured TDOA to a network node.
  15. 15 . The receiving radio node according to claim 11 , further being configured to calculate the TDOA resulting in an ellipse indicating the position of the radio device.
  16. 16 . The receiving radio node according to claim 12 , wherein the radio device is configured to obtain the identity of the radio device based on a modulation frequency of the second signal.
  17. 17 . A radio device configured to enable positioning of the radio device, the radio device further being configured to: receive a first signal from the transmitting radio node, scatter the first signal and frequency modulate the scattered first signal resulting in a second signal, send the scattered and frequency modulated second signal to one or more receiving radio nodes.
  18. 18 . The radio device according to claim 17 , further being configured to frequency modulate the scattered first signal by embedding the identity of the radio device.
  19. 19 . The radio device according to claim 17 , further being configured to frequency modulate the scattered first signal by Doppler modulating the scattered first signal.
  20. 20 . The radio device according to claim 19 , configured with a modulating frequency that is different compared to other radio devices.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is continuation of U.S. patent application Ser. No. 18/245,041 filed on Mar. 13, 2023, which itself is a 35 U.S.C § 371 national stage application for International Application No. PCT/SE2020/050860, entitled “RECEIVING RADIO NODE, RADIO DEVICE, NETWORK NODE AND METHODS FOR POSITIONING THE RADIO DEVICE”, filed on Sep. 15, 2020, assigned to the assignee hereof, and expressly incorporated herein by reference. TECHNICAL FIELD Embodiments herein relate to a receiving radio node, a radio device, a network node, and methods therein. In some aspects, they relate to positioning the radio device. Embodiments herein further relates to computer programs and carriers corresponding to the above methods and network nodes. BACKGROUND In a typical wireless communication network, wireless devices, also known as wireless communication devices, mobile stations, stations (STA) and/or User Equipment (UE), communicate via a Local Area Network such as a Wi-Fi network or a Radio Access Network (RAN) to one or more core networks (CN). The RAN covers a geographical area which is divided into service areas or cell areas, which may also be referred to as a beam or a beam group, with each service area or cell area being served by a radio network node such as a radio access node e.g., a Wi-Fi access point or a radio base station (RBS), which in some networks may also be denoted, for example, a NodeB, eNodeB (eNB), or gNB as denoted in 5G. A service area or cell area is a geographical area where radio coverage is provided by the radio network node. The radio network node communicates over an air interface operating on radio frequencies with the wireless device within range of the radio network node. Specifications for the Evolved Packet System (EPS), also called a Fourth Generation (4G) network, have been completed within the 3rd Generation Partnership Project (3GPP) and this work continues in the coming 3GPP releases, for example to specify a Fifth Generation (5G) network also referred to as 5G New Radio (NR) or Next Generation (NG). The EPS comprises the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), also known as the Long Term Evolution (LTE) radio access network, and the Evolved Packet Core (EPC), also known as System Architecture Evolution (SAE) core network. E-UTRAN/LTE is a variant of a 3GPP radio access network wherein the radio network nodes are directly connected to the EPC core network rather than to RNCs used in 3G networks. In general, in E-UTRAN/LTE the functions of a 3G RNC are distributed between the radio network nodes, e.g. eNodeBs in LTE, and the core network. As such, the RAN of an EPS has an essentially “flat” architecture comprising radio network nodes connected directly to one or more core networks, i.e. they are not connected to RNCs. To compensate for that, the E-UTRAN specification defines a direct interface between the radio network nodes, this interface being denoted the X2 interface. Multi-antenna techniques may significantly increase the data rates and reliability of a wireless communication system. The performance is in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a Multiple-Input Multiple-Output (MIMO) communication channel. Such systems and/or related techniques are commonly referred to as MIMO. Positioning has been a topic in LTE standardization since 3GPP Release 9. The primary objective is to fulfill regulatory requirements for emergency call positioning. Positioning in NR is proposed to be supported by an architecture as shown in FIG. 1. FIG. 1 depicts NG-RAN Release-15 Location Services (LCS) protocols. Location Management Function (LMF) is the location server in NR. There are also interactions between the location server and the gNodeB via the NR Positioning Protocol A (NRPPa) protocol. The interactions between the gNodeB and the UE are supported via the Radio Resource Control (RRC) protocol. In FIG. 1, E-SMLC means Evolved Serving Mobile Location Centre,AMF means Mobility Management Function;NLs is the interface between the LMF and the AMF,LTE-Uu is the interface between the UE and the ng-eNB in LTE,NR-Uu is the interface between the UE and the gNB in NR,Xn is the interface between the ng-eNB and gNB.TP means . . . , Transmission point Note 1: The gNB and ng-eNB may not always both be present. Note 2: When both the gNB and ng-eNB are present, the NG Core (NG-C) interface is only present for one of them. There exist already numerous methods to enable the computation of a UE's position in a network, making use of reference signals either received by the UE, downlink reference signals, received by the network, uplink reference signals, or both. Typically, a positioning algorithm is deployed over multiple cells involved in measurements of reference signals. The UE need not be connected to all cells, in the sense that not all cells are serving cells with an RRC co