Method for user equipment to receive positioning reference signal, method for base station to transmit the same, and related apparatuses
By configuring PRS muting subbands and applying prioritization rules, the method addresses the overlap between PRS and uplink subbands, enhancing OTDOA positioning performance and reliability in the 3GPP NR system.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD
- Filing Date
- 2025-11-13
- Publication Date
- 2026-05-21
AI Technical Summary
The existing 3GPP New Radio (NR) system faces challenges in managing the overlap between positioning reference signals (PRS) and uplink subbands, leading to potential collisions and degradation of OTDOA positioning performance due to the lack of network awareness and transparent subband configurations.
The proposed method involves configuring PRS muting subbands and resource sets, allowing PRS transmission only in non-overlapping resource elements, with zero or non-zero power based on specific conditions, and implementing prioritization rules to handle time overlaps, ensuring PRS availability and enhancing OTDOA robustness.
This approach improves spectrum efficiency, enhances OTDOA robustness, and increases communication performance by ensuring PRS availability and reliability under uplink subband coexistence.
Smart Images

Figure CN2025134677_21052026_PF_FP_ABST
Abstract
Description
METHOD FOR USER EQUIPMENT TO RECEIVE POSITIONING REFERENCE SIGNAL, METHOD FOR BASE STATION TO TRANSMIT THE SAME, AND RELATED APPARATUSESTECHNICAL FIELD
[0001] The present disclosure relates to wireless communication, and more particularly, to a method for a user equipment (UE) to receive positioning reference signal (PRS) , a method for a base station (BS) to transmit PRS, and related apparatuses.BACKGROUND ART
[0002] In cellular wireless communication systems developed by the Third Generation Partnership Project (3GPP) , user equipment (UE) is connected by a wireless link to a radio access network (RAN) . The RAN includes a set of base stations (BSs) which provide wireless links to UEs located in cells covered by the base station and an interface to a core network (CN) which provides overall network control. The RAN and CN each conduct respective functions in relation to the overall network. The so-called 4G Long Term Evolution (LTE) system, namely, an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network (E-UTRAN) has been developed for a mobile access network where one or more macro-cells are supported by a base station known as an eNodeB or eNB (evolved NodeB) . Evolved from LTE, the so-called 5G or new radio (NR) systems where one or more cells are supported by a base station known as a gNB. Envisioned to succeed the current 5G networks, the 6G cellular system is the forthcoming generation of wireless communication technology.
[0003] Location based services (LCS) acquire terminal location data via wireless communication networks or other positioning systems, then integrate this information with Geographic Information Systems (GIS) to deliver a range of location-based information to end users. Today, outdoor positioning is widely adopted in various fields. As wireless communication technologies advance, the high-precision positioning technology based on the mobile communication network effectively fill the gaps left by satellite navigation in certain scenarios. The location network architecture demands even higher accuracy and lower latency. In the core network architecture, the LMF (Location Management Function) is the network entity responsible for supporting positioning and location services for user equipments.
[0004] The location based services (LCS) will bring great convenience and new exciting services to subscribers of future mobile communication networks and therefore generate significant revenues to the operators. LCS requires the integration of wireless network infrastructure, mobile terminals, and a range of location-specific applications and content. The fundamental technology supporting LCS, however, is mobile terminal positioning. There are several mobile positioning techniques discussed in 3GPP standard body including, for example, the methods based on cell-ID, assisted-GPS signal, angle-of-arrival (AOA) measurement, time-of-arrival (TOA) measurement and time-difference-of-arrival (TDOA) measurement. Among them, TDOA-based solution is mostly well studied. The TDOA technique (called Observed-Time-difference-of-Arrival, i.e., OTDOA) based on time-of-arrival (ToA) measurements of downlink signals, e.g., positioning reference signal (PRS) , was specified in both 4th Generation LTE standard and 5th Generation New Radio standard.SUMMARY
[0005] An object of the present disclosure is to propose a method for a UE to receive positioning reference signal (PRS) , a method for a base station to transmit PRS, and related apparatuses, which can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, increase communication performance, and / or provide high reliability.
[0006] In a first aspect of the present disclosure, provided is a method for a user equipment (UE) to receive a positioning reference signal (PRS) , comprising receiving, by the UE, configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; and receiving, by the UE, PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands.
[0007] In a second aspect of the present disclosure, provided is a method for a base station (BS) to transmit positioning reference signal (PRS) , comprising sending to a user equipment (UE) configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; transmitting PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands; and transmitting the PRS on remaining PRS resource elements with non-zero transmission power.
[0008] In a third aspect of the present disclosure, provided is a user equipment (UE) , comprising a configuration receiving module, configured to receive configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; and a PRS receiving module, configured to receive PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands.
[0009] In a fourth aspect of the present disclosure, provided is a base station (BS) , comprising a configuration sending module, configured to send to a user equipment (UE) configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; and a PRS transmitting module, configured to transmit PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands, wherein the PRS transmitting module is further configured to transmit the PRS on remaining PRS resource elements with non-zero transmission power.
[0010] In a fifth aspect of the present disclosure, provided is a user equipment (UE) , including at least one memory configured to store program instructions; and at least one processor configured to execute the program instructions, which cause the at least one processor to execute the method according to the first aspect described above.
[0011] In a sixth aspect of the present disclosure, provided is a base station (BS) , including at least one memory configured to store program instructions; and at least one processor configured to execute the program instructions, which cause the at least one processor to execute the method according to the second aspect described above.
[0012] In a seventh aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to execute any of the above methods.
[0013] In an eighth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute any of the above methods.
[0014] In a ninth aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute any of the above methods.
[0015] In a tenth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute any of the above methods.
[0016] In an eleventh aspect of the present disclosure, a computer program causes a computer to execute any of the above methods.DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present disclosure or related art, the following figures that will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.
[0018] FIG. 1 is a schematic diagram illustrating the roles of UE, gNB and LMF server in PRS-based positioning as well as the signaling protocol among these entities.
[0019] FIG. 2 is a schematic diagram illustrating PRS structure and its transmission in existing of muting subband.
[0020] FIG. 3 is a schematic diagram illustrating a scenario where RE overlapping exists between PRS and UL subband.
[0021] FIG. 4 is a schematic diagram illustrating the time overlapping between PRS transmitted by a neighbor cell and uplink subband operated by a serving cell.
[0022] FIG. 5 is a schematic diagram illustrating the existing NRPPa protocol signaling flow between gNB and LMF server for PRS based OTDOA positioning.
[0023] FIG. 6 is a schematic diagram illustrating a 5th-Generation (5G) architecture according to an embodiment of the present application.
[0024] FIG. 7 is a schematic diagram illustrating a 5G architecture in a service-based representation.
[0025] FIG. 8 is a block diagram of a user equipment (UE) and one or more network nodes in a communication network system according to an embodiment of the present disclosure.
[0026] FIG. 9 is a flowchart of a method for a user equipment to receive a positioning reference signal (PRS) according to an embodiment of the present disclosure.
[0027] FIG. 10 is a schematic diagram illustrating the protocol signaling flow among LMF server, gNB and UE to setup PRS muting subband.
[0028] FIG. 11 is a flowchart of a method for a base station to transmit a positioning reference signal (PRS) according to an embodiment of the present disclosure.
[0029] FIG. 12 is a schematic diagram illustrating an existing LPP protocol signaling flow between UE and LMF server.
[0030] FIG. 13 is a block diagram of a user equipment according to an embodiment of the present disclosure.
[0031] FIG. 14 is a block diagram of a base station according to an embodiment of the present disclosure.
[0032] FIG. 15 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.DETAILED DESCRIPTION OF EMBODIMENTS
[0033] Embodiments of the disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.
[0034] In this document, the term “ / ” should be interpreted to indicate “and / or. ” A combination such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” or “A, B, and / or C” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any combination may contain one or more members of A, B, or C.
[0035] In OTDOA positioning, a user equipment (UE) whose position is to be determined measures a set of time differences of arrival (TDOA) at UE antenna end, where each of arrival time differences corresponds to the time difference between the arrival time of a received PRS transmitted by a reference base station (also called gNB in NR network) and the arrival time of a received PRS transmitted by another base station. All these base stations can include the UE’s serving base station and a number of neighboring base stations. As shown in FIG. 1, the UE receives PRS from its serving gNB and neighboring gNB’s . Meanwhile, all these gNB’s send the time-domain information and frequency-domain information of PRS transmissions to a centralized network node called Location Management Function (LMF) server, which directs the necessary information for PRS receptions to the UE via the serving gNB. In 3GPP standard body, the communication between gNB and LMF server is implemented in New Radio Positioning Protocol Annex (NRPPa) , while the communication between the UE and LMF server still follows the protocol in 4G LTE called LTE Positioning Protocol (LPP) . It should be noted that the LPP is transparent to gNB. In other words, the serving gNB does not know what are delivered to UE in LPP signaling.
[0036] The downlink PRS is transmitted in unit of PRS resource. In the time domain, the UE assumes the downlink PRS resource is transmitted in the slot of radio frame nf if the following conditions are all met:
[0037] ● Condition-1: satisfies following equations
[0038] ● Condition-2: The corresponding PRS resource in the slot is not identified as being muted by higher-layer signaling dl-PRS-MutingOption1 or dl-PRS-MutingOption2.
[0039] where
[0040] ● A configured number of PRS resources construct a PRS resource set in a configured time slot periodicity of with a configured time gap of in unit of slot between every two adjacent PRS resources in time. As an example, in FIG. 2, and is the “repetition gap” .
[0041] ● is the number of slots in a radio frame for a given subcarrier spacing numerology μ.
[0042] ● is a configured time offset, in unit of slot, of PRS resource set in relative to start of system frame with SFN=0, i.e., the “PRS resource set offset” in FIG. 2.
[0043] ● is a configured time offset, in unit of slot, of the first of PRS resources in relative to start of PRS resource set periodicity, i.e., the “PRS resource offset” in FIG. 2.
[0044] In the frequency domain, the PRS resources occupy one of every resource elements (RE) within a number of contiguous physical resource blocks (PRB) that is configured as PRS bandwidth and start at a configured PRB offset, shown as PRS-StartPRB in FIG. 2, in relative to PRS Point A that is also configured to UE by higher-layer signaling.
[0045] When it comes to NR Release-19, one duplex enhancement is implemented in 3GPP standard to support in TDD carrier the full-duplex operation on base station side while the half-duplex operation is maintained on UE side, i.e., the base station may transmit downlink signal to one UE and receive uplink signal from another UE at the same time in a TDD carrier, while no UE performs simultaneous downlink reception and uplink transmission in the same OFDM symbol. In order to realize full duplex operation in the TDD system, the network is allowed to configure a reallocation of a subband of contiguous resources in frequency domain over a number of contiguous downlink symbol (s) for uplink use. Each uplink subband contains resource elements (RE) within a subband bandwidth in frequency domain and over a time-span in time domain.
[0046] Once such uplink subband is configured over downlink symbols, the OFDM RE’s within the subband as well as the guard-bands around the uplink subband can no longer be used for downlink purpose. Because the existing NR specification does not allow subband-based muting of PRS in frequency domain, if some REs of a PRS resource cannot be transmitted, the whole PRS resource may be muted from time domain. However, removing the whole PRS resource may degrade the OTDOA-based positioning performance. Therefore, it is desirable for UE to know that a part of PRS resource in frequency domain is not transmitted while the remaining RE’s of PRS resource are still transmitted. Although the UE can obtain this information for the PRS resources transmitted from its own serving gNB by combining the PRS configuration and the uplink subband configuration that are delivered to UE by LMF server and serving gNB respectively, the UE cannot obtain the corresponding information for the PRS resources transmitted from neighboring cells. In addition, because PRS-based positioning and uplink subband utilization can be separate UE features, the UE that can perform PRS-based positioning may not recognize the uplink subband configuration and therefore cannot derive the subband-based PRS resource muting. So, the UE may receive PRS muting subband configuration alone with PRS configuration, which is transparent to the uplink subband configuration.
[0047] FIG. 3 depicts a scenario where RE overlapping exists between PRS and UL subband. FIG. 4 depicts the time overlapping between PRS transmitted by a neighbor cell and uplink subband operated by a serving cell. When the New-Radio system combines both PRS functionality and UL subband functionality together, one issue can arise. Take FIG. 3 for an example, an UE receives PRS1 transmitted from its serving gNB that operates with uplink subband and PRS2 transmitted from one of neighboring gNB’s , and the PRS2 occupies some time duration overlapping with the uplink subband that is operated by the serving cell, as shown in FIG. 4. Neither PRS1 nor PRS2 is truncated by any of uplink subband when being transmitted from the corresponding gNB’s . However, there will be a potential collision on the UE side between uplink usage in the uplink subband and downlink reception of PRS due to the UE’s limitation of half-duplex operation. What’s more, according to the existing NRPPa signaling flow (between gNB and LMF server) shown in FIG. 5, the current NRPPa protocol just gives the LMF server a way to learn, instead of any way to impact, how the PRS resources are allocated. At last, the concerned collision between PRS and uplink subband can happen even if the serving cell in FIG. 3 does not transmit any PRS and therefore does not communicate with LMF server based on existing 3GPP network protocol. That is to say, the neighboring gNB or even the LMF server in FIG. 3 may not know the existence of uplink subband operated by the serving cell, which means there can be no network node being aware of the collision and there is no network node being able to either avoid or handle such collision.
[0048] The present disclosure provides techniques for the base station to transmit and for the user equipment to receive the downlink positioning reference signal (PRS) in the downlink symbols with configured uplink subband in which the PRS transmission is not allowed. Furthermore, the present disclosure provides exemplary techniques for handling the potential overlapping in time between a downlink positioning reference signal (PRS) and a configured uplink subband. Moreover, the present disclosure provides exemplary techniques to avoid the potential overlapping in time between a downlink positioning reference signal (PRS) and a configured uplink subband. The present disclosure has application to, but is not limited to, the 3GPP New Radio (NR) system.
[0049] FIG. 6 shows a 5G architecture. Devices involved in the 5G architecture include UE, a Radio Access Network (RAN) , a User Plane Function (UPF) , an Access and Mobility Management Function (AMF) , a Location Management Function (LMF) , a Unified Data Management (UDM) , a Network Exposure Function (NEF) , a Network Data Analytics Function (NWDAF) , a Gateway Mobile Location Center (GMLC) , a Local Retrieval Function (LRF) and an Application Function (AF) . It is noted that this application may be illustrated by using the architecture shown in FIG. 6; however, this application may be applicable to future communication system such as 6G system.
[0050] As shown in FIG. 6, the UPF plays a crucial role in the user plane architecture of the core network, specifically within the 5G Core (5GC) . The UPF is responsible for managing and forwarding user plane data traffic between the RAN and external data networks, such as the Internet or private networks. The AMF is mainly responsible for executing access and UE mobility management tasks. The LMF provides the overall co-ordination and scheduling of resources required for the location of a UE that is registered with or accessing 5GCN, for example. It also calculates a final location or any velocity estimate. Some of the UDM functionalities are user identification handling and access authorization based on subscription data. Some of the functionalities of NEF are exposure of capabilities, events and analytics, and secure provisioning of information from external applications to the 5G network. GMLC functionalities include the support for 5GC related periodic, triggered and UE available location events to external clients after performing authorization. The LRF’s responsibility is to retrieve or validate the location information for a UE which has initiated an IMS emergency session. The NWDAF collects, analyzes, and provides insights from network data, enabling various applications and improving network performance. The AF interacts with the 3GPP Core Network to provide services.
[0051] FIG. 7 shows a 5G architecture in a service-based representation. It is noted that this application is applicable to the architecture shown in FIG. 7, but is not limited thereto. The application can also be applied to future communication system such as 6G system.
[0052] The illustrated 5G system architecture in FIG. 7 can be service-based and interaction between network functions can be represented by corresponding service-based interfaces. As illustrated in FIG. 7, service-based representations can be used to represent network functions that enable other authorized network functions to access their services. In this regard, 5G system architecture can include the following service-based interfaces: Namf (a service-based interface exhibited by the AMF) , Nlmf (a service-based interface exhibited by the LMF) , Ngmlc (a service-based interface exhibited by the GMLC) , Nnef (a service-based interface exhibited by the NEF) , a Nudr (a service-based interface exhibited by the UDR) , a Nudm (a service-based interface exhibited by the UDM) , Naf (a service-based interface exhibited by the AF) , Nnwdaf (a service-based interface exhibited by the NWDAF) . Other service-based interfaces can also be used.
[0053] FIG. 8 illustrates that, in some embodiments, a user equipment (UE) 10 and one or more network nodes 20 in a communication network system 30 according to an embodiment of the present disclosure are provided. The communication network system 30 includes the UE 10 and one or more network nodes 20. A network node 20 may communicate with the UE 10 directly or via another network node 20. The network nodes 20 may refer to one or more types of network devices or network elements. One of these could be a base station (BS) such as a gNB. The UE 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The one or more network nodes 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and / or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and / or receives a radio signal.
[0054] The processor 11 or 21 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and / or data processing device. The memory 12 or 22 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and / or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
[0055] In some embodiments, the processor 11 of the UE 10 is configured to receive configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted, and receive PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands. This can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability.
[0056] In some embodiments, the processor 21 of the network node 20 is configured to send to a user equipment (UE) configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted, and transmit PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands, wherein the PRS transmitting module is further configured to transmit the PRS on remaining PRS resource elements with non-zero transmission power. This can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability.
[0057] The present disclosure provides techniques for the base station to transmit and for the user equipment to receive the downlink positioning reference signal (PRS) in the downlink symbols with configured uplink subband in which the PRS transmission is not allowed. The present disclosure has application to, but is not limited to, the 3GPP New Radio (NR) system.
[0058] FIG. 9 is a flowchart of a method 100 for a user equipment to receive a positioning reference signal (PRS) according to an embodiment of the present disclosure. Referring to FIG. 9, the method 100 includes the following steps.
[0059] In Step 102, the UE receives configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted.
[0060] The present disclosure provides techniques for the configuration of the PRS muting subband and the PRS resource transmission in the presence of PRS muting subband.
[0061] More specifically, a PRS muting subband that is derived to cover an uplink subband may occupy a rectangular-shape of OFDM resources that spans over a configurable number of consecutive PRBs from a configurable starting PRB in frequency domain and meanwhile a configurable number of consecutive slots from a configurable starting slot in time domain.
[0062] For the configuration of frequency-domain dimension of PRS muting subband, there are options as following:
[0063] ● Option 1: The configuration of frequency domain dimension is given by a starting PRB index and an ending PRB index.
[0064] ○ Option 1a: Both the starting PRB index and the ending PRB index are defined in relative to Point A that is used in definition of frequency domain dimension of uplink subband.
[0065] ○ Option 1b: Both the starting PRB index and the ending PRB index are defined in relative to PRS Point A that is used in definition of frequency domain dimension of PRS resource.
[0066] ● Option 2: The configuration of frequency domain dimension is given by a starting PRB index and a number of consecutive PRBs.
[0067] ○ Option 2a: The starting PRB index is defined in relative to Point A that is used in definition of frequency domain dimension of uplink subband.
[0068] ○ Option 2b: The starting PRB index is defined in relative to PRS Point A that is used in definition of frequency domain dimension of PRS resource.
[0069] All above four options can work. However, because PRS Point A is already contained in the LPP signaling for the PRS configuration, it becomes redundant to use Point A from uplink subband configuration. Therefore, the above Option 1b or Option 2b is a preferable choice for PRS configuration in LPP signaling from LMF to UE and, if necessary, the PRS configuration in LPPa signaling from LMF to gNB. On the other hand, in case a gNB should inform LMF of its uplink subband allocation so that the LMF can decide an appropriate PRS muting subband and send the corresponding PRS configuration to gNB and UE, the gNB should use Point A, instead of PRS Point A, in the report of uplink subband allocation in LPPa signaling that is sent from gNB to LMF. After receiving this informing report, the LMF should perform the translation from Point A to PRS Point A.
[0070] In summary, the configuration from LMF to gNB and UE for frequency domain dimension of a PRS muting subband contains following information:
[0071] ● PRS Point A; and
[0072] ● The starting PRB index of the PRS muting subband, in relative to PRS Point A; and
[0073] ● The ending PRB index of the PRS muting subband, in relative to PRS Point A, or the number of PRB’s in the PRS muting subband.
[0074] Meanwhile, the indication from gNB to LMF to inform the frequency domain dimension of a PRS muting subband contains the following information:
[0075] ● Point A of cell-specific resource plane; and
[0076] ● The starting PRB index of the allocation of the uplink subband and the associated guardband, in relative to Point A; and
[0077] ● The ending PRB index of the allocation of the uplink subband and the associated guardband, in relative to Point A, or the number of PRB’s in the allocation of the uplink subband and the associated guardband.
[0078] For the configuration of time-domain dimension of PRS muting subband, there are options as following:
[0079] ● Option 1: The configuration of time domain dimension is given by a starting slot index and an ending slot index.
[0080] ● Option 2: The configuration of time domain dimension is given by a starting slot index and a number of consecutive slots.
[0081] The time length of a PRS muting subband should be sufficiently long on slot level to cover the time length of a corresponding uplink subband. Because the PRS resource set periodicity, which is shown as in equation (1) , can be different from the periodicity of uplink subband, the time domain dimension of PRS muting subband may follow a formulation similar to equation (1) but with different parameters. For instance, the starting slot and the ending slot of a PRS muting subband, both of which are represented in format, should satisfy
[0082] where
[0083] ● is the PRS muting subband periodicity in unit of slot. Because the radio frame number counts cyclically from 0 to 1024 and each frame contains 10·2μ slots for subcarrier spacing numerology μ, should be a divisible factor of 10240·2μ.
[0084] ● is the offset, in unit of slot, of a PRS muting subband periodicity in relative to starting of radio frame of SFN=0. In some cases, this offset can be zero.
[0085] ● is the starting slot index used to determine the starting slot index of each periodic PRS muting subband instance, and is the ending slot index used in Option 1 to determine the ending slot index of each periodic PRS muting subband instance. It is required that the time length of a PRS muting subband is no larger than the PRS muting subband periodicity and
[0086] In summary, the configuration from LMF to gNB and UE for time domain dimension of a PRS muting subband contains following information:
[0087] ● A periodicity of the PRS muting subband;
[0088] ● Optionally, a slot offset of the PRS muting subband periodicity;
[0089] ● A starting slot index;
[0090] ● An ending slot index or a number of consecutive slots.
[0091] Meanwhile, the indication from gNB to LMF to inform or request a time domain dimension of a PRS muting subband contains the same information elements as above.
[0092] In Step 104, the UE receives PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands.
[0093] More specifically, after receiving the PRS muting subband configuration from LMF, gNB transmits the PRS with zero power on a PRS resource element if any of the following conditions is met:
[0094] ● Condition-A1: The PRS resource element belongs to a PRS resource that is identified as muted by information element PRS Muting in NRPPa signaling;
[0095] ● Condition-A2: The PRS resource element falls into a PRS muting subband configured by NRPPa signaling.
[0096] The gNB transmits the PRS with non-zero power on the remaining PRS resource elements in the configured PRS resource. In addition, if a PRS resource with PRS bandwidth equal to does not satisfy Condition-A1 but overlaps with a PRS muting subband with subband bandwidth equal to the non-zero transmission power on the remaining PRS RE’s is boosted as the energy-per-resource-element (EPRE) power multiplied by where the PRS EPRE power is a power in the case that the PRS resource does not overlap with any PRS muting subband.
[0097] More specifically, after receiving the PRS muting subband configuration from LMF, UE assumes a downlink PRS resource element is transmitted by gNB with a non-zero power if both of the following conditions are met:
[0098] ● Condition-B1: The PRS resource element does not belong to any PRS resource that is identified as muted by higher-layer signaling dl-PRS-MutingOption1 or dl-PRS-MutingOption2 in LPP signaling;
[0099] ● Condition-B2: The PRS resource element does not fall into any PRS muting subband configured by LPP signaling.
[0100] Further, if a PRS resource with PRS bandwidth equal to is not identified as muted by higher-layer signaling dl-PRS-MutingOption1 or dl-PRS-MutingOption2 but overlaps with a PRS muting subband with subband bandwidth equal to UE should assume the non-zero power on the PRS resource element equals to the PRS EPRE power multiplied by where the PRS EPRE power is a power in the case that the PRS resource does not overlap with any PRS muting subband.
[0101] It is noted that, when some PRS RB's cannot be actually used to transmit PRS due to its overlapping with PRS muting subband, only the PRS RE's in the RB's NOT overlapping with PRS muting subband can be transmitted, so the same total energy can be equally distributed to these non-overlapping RB's . Then the new and therefore boosting factor is The overlapping between PRS and PRS muting subband may not be partial overlapping, i.e., the PRS muting subband does not go beyond bandwidth of PRS in frequency domain. This is a reasonable because the PRS muting subband is dedicatedly defined / configured upon a PRS -it may be meaningless to have a PRS muting subband to cover some RBs not even possibly used by the PRS. However, in some other cases, can also be possible to represent the total number of RB's overlapping between PRS RB's and muting subband RB's .
[0102] FIG. 10 depicts the protocol signaling flow among LMF server, gNB and UE to setup PRS muting subband. Referring to FIG. 10, the protocol signaling flow comprises the followings:
[0103] In Step 1, gNB informs LMF of its UL subband allocation and associated guardband allocation via LPPa protocol.
[0104] In Step 2, based on the information in Step 1 from gNB, LMF can determine an appropriate PRS muting subband and send the corresponding PRS configuration to gNB and UE.
[0105] In Step 3, LMF sends the corresponding PRS configuration to gNB via LPPa protocol to configure the PRS with muting subband.
[0106] In Step 4, gNB transmits PRS with presence of PRS muting subband to UE.
[0107] In Step 5, LMF send the corresponding PRS configuration to UE via LPP protocol to configure the PRS with PRS muting subband.
[0108] In Step 6, UE receives PRS with presence of PRS muting subband from gNB.
[0109] In the embodiments of the present disclosure, the UE assumes the PRS is transmitted on a PRS resource element in a configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any configured PRS muting subband. This solution can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability.
[0110] FIG. 11 is a flowchart of a method 200 for a base station to transmit a positioning reference signal (PRS) according to an embodiment of the present disclosure.
[0111] Referring to FIG. 11, the method 200 includes the following steps. In Step 202, the base station (BS) sends to a user equipment (UE) configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted. In Step 204, the base station transmits PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands. In Step 206, the base station transmits the PRS on remaining PRS resource elements with non-zero transmission power. This can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability. Other details of the method 200 may be referred to the method 100 described above and are not repeated herein.
[0112] The present disclosure further provides exemplary techniques for handling the potential overlapping in time between a downlink positioning reference signal (PRS) and a configured uplink subband. More specifically, the present disclosure provides exemplary techniques to handle the collision between PRS and uplink subband due to time overlapping, by applying prioritization rules.
[0113] In case the time overlapping between a PRS resource and a uplink subband occurs, the prioritization between the two can be done with each of the following rules respectively.
[0114] Rule-1 (un-conditional semi-static prioritization of PRS) : The UE receives the PRS on PRS resource and does not transmit in the slots in which the PRS resource overlaps with the uplink subband. This rule ensures the consistent positioning performance as the top priority.
[0115] Rule-2 (conditional semi-static prioritization) : If at least one PRS resource overlapping with the configured uplink subband in the overlapping slot is not configured as muted, the UE receives the PRS signal on the un-muted PRS resource and does not transmit in the slot where the overlapping occur; otherwise, the UE does not receive any PRS and prioritizes the uplink subband operations in the overlapping slot. This rule improves the Rule-1 above by that only the un-muted PRS resource prioritizes the uplink subband, while the muted PRS resource does not.
[0116] Rule-3 (conditional semi-static prioritization) : If the number of PRS resources that are not configured as muted and are overlapping with the configured uplink subbands in the overlapping slot is larger than a threshold, where the threshold can be configured to the UE by the radio resource control (RRC) signaling, the UE receives the PRS signals on the un-muted PRS resources and does not transmit in the slot where those overlapping occur; otherwise, the UE does not receive any PRS and prioritizes the uplink subband operations in the overlapping slot. This rule improves the Rule-2 above by further allowing an adjustable threshold, comparing to a fixed threshold of one in the Rule-2 above, of un-muted PRS resources overlapping with uplink subband in the prioritization decision. This is because, although the number of gNB’s transmitting PRS should be at least three for 2-dimentioanl positioning and at least four for 3-dimentioanl positioning, a sufficiently larger number of gNB’s more than three or four can be essential to maintain the consistent positioning performance. Assume one un-muted PRS resource corresponds to one gNB transmitting the PRS, this rule can give a more accurate protection from a big amount of PRS resource loss due to overlapping collision while maintaining an uplink subband utilization whenever a certain amount of PRS resource loss does not cause a big performance issue.
[0117] Rule-4 (un-conditional semi-static prioritization of uplink subband) : The UE ignores the PRS resources in a slot in which the PRS resource overlaps with the uplink subband. This rule prioritizes the uplink subband operations by assuming that the network ensures, by mean of certain OAM communication between gNBs and LMF server, to leave the UE with sufficient PRS resources not overlapping with uplink subbands for a desirable OTDOA positioning performance.
[0118] Rule-5 (conditional dynamic prioritization) : The UE receives the PRS signal on the PRS resource in a slot where the PRS resource overlaps with the uplink subband, if and only if the UE does not transmit in the slot.
[0119] Rule-6 (conditional dynamic prioritization) : The UE receives the PRS signal on the PRS resource in a slot where the PRS resource overlaps with a uplink transmission occasion in the uplink subband, if and only if the UE does not transmit in the uplink transmission occasion in the slot a uplink channel or signal whose priority is prioritized over a given priority threshold, where this priority threshold can be configured to the UE by RRC signaling.
[0120] Rule-7 (time pattern based prioritization) : The UE is configured with a time-domain prioritization pattern, which identifies a set of time durations in which the downlink reception of PRS is prioritized over uplink transmission in uplink subband or vice versa, and the remaining time durations with a reversed prioritization over the two. The UE determines the prioritization between the overlapping PRS reception and uplink transmission in uplink subband in a slot by looking at how the slot falls into this time-domain prioritization pattern. More specifically, the time-domain prioritization pattern may identify a first set of time durations in which the downlink reception of PRS is prioritized over uplink transmission in uplink subband and, if necessary, a second set of time durations with a reversed prioritization. The UE receive the PRS on the one or more PRS resources in the slot if and only if the slot belongs to the first set of time duration.
[0121] Some of rules listed above may be combined. For example, the prioritization between the PRS reception and the uplink transmission in the slot can be a logic combination of a semi-static condition in Rule-2 or Rule-3 on the number of un-muted PRS resources in the slot, a dynamic condition in Rule 5 or Rule-6 on priority level of the uplink channel or signal that is to be transmitted in the slot, and a time-pattern in Rule-7.
[0122] In some embodiments, for the prioritization in UE between downlink reception of positioning reference signals (PRS) on one or more PRS resources and uplink transmissions in a uplink subband with time overlapping in a slot between the PRS resources and the uplink subband, if the number of the overlapping PRS resources that are not configured as muted in the slot is larger than a threshold, the UE can receive the PRS signals on the un-muted PRS resources and does not transmit in the slot; otherwise, the UE does not receive any PRS and prioritizes the uplink transmissions in the slot. In some cases, the threshold can be set to be equal to one. In some other cases, the threshold can be set to be equal to zero, and in this case the UE receives the PRS on PRS resources and does not transmit in the slot. In some other cases, the threshold cab be set to be equal to infinity, and in this case the UE prioritizes the uplink transmissions and does not receive the PRS on the PRS resources in the slot.
[0123] In some embodiments, for the prioritization in UE between downlink reception of positioning reference signals (PRS) on one or more PRS resources and uplink transmissions in a uplink subband with time overlapping in a slot between the PRS resources and the uplink subband, the UE can receive the PRS signal on the PRS resources in the slot, if and only if the UE does not transmit in the slot an uplink channel or signal whose priority is prioritized over a priority threshold, where the priority threshold can be set to below the lowest priority that a uplink channel or signal can have, i.e., the UE receives the PRS signal on the PRS resource in the slot if and only if the UE does not transmit any uplink channel or signal in the slot.
[0124] The present disclosure further provides exemplary techniques to avoid the potential overlapping in time between a downlink positioning reference signal (PRS) and a configured uplink subband. More specifically, the present disclosure provides exemplary techniques to avoid the potential collision due to the overlapping in time between PRS and uplink subband.
[0125] There can be two options in avoidance of the overlapping in time between PRS and uplink subband.
[0126] ● Option-1: The information of all PRS resource allocations in time domain that a served UE can observe is made known to the serving gNB that operates the uplink subband, so that the uplink subband allocation can avoid overlapping in time with all the PRS resources.
[0127] ● Option-2: The information of all uplink subband allocations in time domain that can be observed by a UE requesting OTDOA positioning service in the corresponding service area is made known to LMF, so that the PRS resources provided to the UE by LMF as positioning assistance data can exclude the PRS resources overlapping in time with the uplink subband. It should be noted that the LMF may not need to directly know the existence of an uplink subband –it may be sufficient for LMF to know there is a “blank-out” duration that actually corresponds to an uplink subband.
[0128] Within Option-1, there are two alternatives, Alt 1-1 and Alt 1-2, for signaling modifications on the existing protocols.
[0129] In Alt 1-1, a new NRPPa signaling handshake between a serving gNB and LMF server is added to the existing signaling framework, including:
[0130] ● A request message from the serving gNB (regardless whether transmitting PRS) to LMF server to request information of all the PRS time-domain resource allocations that can be informed via LPP protocol to a UE served by the gNB; and
[0131] ● A respond message from LMF server to the requesting gNB to inform of information of time domain allocations of a set of PRS resources to fulfill the request.
[0132] In Alt 1-2, the LMF server sends to a serving gNB (regardless whether it transmits PRS) a message, such as OTDOA INFORMATION REQUEST message in the existing NRPPa protocol shown in FIG. 5, that includes a new message element for time-domain allocation information of all PRS resources that can be informed via LTE Positioning Protocol (LPP) to a UE served by the gNB, so that the serving gNB can avoid operating a uplink subband overlapping in time with any of those PRS resources.
[0133] Within Option-2, there can also be two alternatives, namely Alt 2-1 and Alt 2-2.
[0134] In Alt 2-1, the existing LPP signaling flow between a UE and LMF server as shown in FIG. 12 is updated by adding time-domain allocation information of uplink subbands, if any configured to the UE, to either ProvideCapabilities message or RequestAssistanceData message, both of which are sent from UE to LMF server on LPP protocol, so that the LMF can send to the UE only the assistant information of the PRS resources not overlapping in time with the uplink subband.
[0135] In Alt 2-2, the existing NRPPa signaling flow between a gNB and LMF server is updated by adding time-domain allocation information of uplink subbands, if any configured at the gNB, to OTDOA INFORMATION RESPONSE message that is transmitted from the gNB to LMF server on NRPPa protocol.
[0136] FIG. 13 is a block diagram of a user equipment 1000 according to an embodiment of the present disclosure. As shown in FIG. 13, the user equipment 1000 includes a configuration receiving module 1001 and a PRS receiving module 1002. The configuration receiving module 1001 is configured to receive configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted. The PRS receiving module 1002 is configured to receive PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands. This can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability. Other details of the UE 1000 may be referred to the method 100 described above and are not repeated herein.
[0137] FIG. 14 is a block diagram of a base station 2000 according to an embodiment of the present disclosure. As shown in FIG. 14, the base station 2000 includes a configuration sending module 2001 and a PRS transmitting module 2002. The configuration sending module 2001 is configured to send to a user equipment (UE) configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted. The PRS transmitting module 2002 is configured to transmit PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands. The PRS transmitting module 2002 is further configured to transmit the PRS on remaining PRS resource elements with non-zero transmission power. This can realize PRS availability, improve spectrum efficiency and enhance OTDOA robustness under uplink subband coexistence, thereby increasing communication performance and / or providing high reliability. Other details of the base station 2000 may be referred to the method 100 described above and are not repeated herein.
[0138] The embodiment of the present disclosure further provides a computer readable storage medium for storing a computer program. The computer readable storage medium enables a computer to execute corresponding processes implemented in each of the methods of the embodiments of the present disclosure. For brevity, details will not be described herein again.
[0139] The embodiment of the present disclosure further provides a computer program product including computer program instructions. The computer program product enables a computer to execute corresponding processes implemented in each of the methods of the embodiments of the present disclosure. For brevity, details will not be described herein again.
[0140] The embodiment of the present disclosure further provides a computer program. The computer program enables a computer to execute corresponding processes implemented in each of the methods of the embodiments of the present disclosure. For brevity, details will not be described herein again.
[0141] The description of above device embodiments is similar to the description of above method embodiments, having beneficial effects similar to the method embodiments. For technical details not disclosed in the device embodiments of the present disclosure, please refer to the description of the method embodiments of the present disclosure for the purpose of understanding.
[0142] In implementation, the above described methods and their variations may be implemented as computer software instructions or firmware instructions. Such instructions may be stored in an article with one or more machine-readable storage devices connected to one or more computers or integrated circuits or digital processors such as digital signal processors and microprocessors. In a communication system of 3GPP New-Radio, the PRS muting subband configuration and the PRS transmission and reception in presence of the PRS muting subband in base station and user equipment and related signal processing, the handling of overlapping between PRS and uplink subband in the network nodes, such as base station and LMF server, and user equipment and related signal processing, and the avoidance of overlapping between PRS and uplink subband in the network nodes, such as base station and LMF server, and user equipment and related signal processing may be implemented in form of software instructions or firmware instructions for execution by a processor in the transmitter and receiver or the transmission and reception controller. In operation, the instructions are executed by one or more processors to cause the transmitter and receiver or the transmission and reception controller to perform the described functions and operations.
[0143] FIG. 15 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and / or software. FIG. 15 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory / storage 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, coupled with each other at least as illustrated. The application circuitry 730 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory / storage and configured to execute instructions stored in the memory / storage to enable various applications and / or operating systems running on the system.
[0144] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and / or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) . Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
[0145] In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
[0146] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and / or the application circuitry. As used herein, “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC) , an electronic circuit, a processor (shared, dedicated, or group) , and / or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and / or the memory / storage may be implemented together on a system on a chip (SOC) . The memory / storage 740 may be used to load and store data and / or instructions, for example, for a system. The memory / storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM) , and / or non-volatile memory, such as flash memory.
[0147] In various embodiments, the I / O interface 780 may include one or more user interfaces designed to enable user interaction with the system and / or peripheral component interfaces designed to enable peripheral component interaction with the system. User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 770 may include one or more sensing devices to determine environmental conditions and / or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and / or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
[0148] In various embodiments, the display 750 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR / VR glasses, etc. In various embodiments, a system may have more or less components, and / or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.
[0149] A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure. It is understood by a person having ordinary skill in the art that he / she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.
[0150] It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.
[0151] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
[0152] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.
[0153] While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.
Claims
1.A method for a user equipment (UE) to receive a positioning reference signal (PRS) , comprising:receiving, by the UE, configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; andreceiving, by the UE, PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands.2.The method according to claim 1, wherein the PRS muting subband spans over a configurable number of consecutive physic resource blocks (PRBs) starting from a configurable starting PRB in frequency domain and a configurable number of consecutive slots starting from a configurable starting slot in time domain.3.The method according to claim 1 or 2, wherein the configuration information comprises frequency domain dimension configuration information of the one or more PRS muting subbands, the frequency domain dimension configuration information contains information of a PRS reference point, a starting PRB index in relative to the PRS reference point, and either an ending PRB index in relative to the PRS reference point or a number of consecutive PRBs in the PRS muting subband.4.The method according any of claims 1 to 3, wherein the configuration information comprises time domain dimension configuration information of the one or more PRS muting subbands, the time domain dimension configuration contains information of a PRS muting subband periodicity in unit of slot, a PRS muting subband periodicity offset in unit of slot, a starting slot index, and either an ending slot index or a number of consecutive slots spanned by the PRS muting subband.5.The method according to claim 4, wherein the starting slot index or the ending slot index of the PRS muting subband in format of is given by: whereinrepresents a slot index in a radio frame for a given subcarrier spacing numerology μ, nf represents a radio frame index, represents a number of slots in the radio frame for the given subcarrier spacing numerology μ, represents the PRS muting subband periodicity, represents the PRS muting subband periodicity offset, andrepresents either the starting slot index or the ending slot index.6.The method according to any of claims 1 to 5, wherein if the PRS resource with PRS bandwidth equal to is not identified as muted but overlaps with the PRS muting subband with subband bandwidth equal to the non-zero transmission power on the PRS resource element equals to PRS energy-per-resource-element (EPRE) power multiplied by where the PRS EPRE power is a power in the case that the PRS resource does not overlap with any of the configured PRS muting subbands.7.The method according to any of claims 1 to 6, wherein the PRS on the PRS resource is received by the UE and uplink signal is not transmitted in the slots in which the PRS resource overlaps with an uplink subband.8.The method according to any of claims 1 to 6, wherein if at least one of the PRS resources overlapping with an uplink subband in an overlapping slot is not configured as muted, the PRS on the un-muted PRS resource is received by the UE and uplink signal is not transmitted in the slot where the overlapping occurs.9.The method according to any of claims 1 to 6, wherein if a number of the PRS resources that are not configured as muted and are overlapping with an uplink subband in an overlapping slot is larger than a threshold, the PRS on the un-muted PRS resources is received by the UE and uplink signal is not transmitted in the slot where the overlapping occurs.10.The method according to claim 9, wherein the threshold is configured to the UE by radio resource control (RRC) signaling.11.The method according to any of claims 1 to 6, wherein the PRS resources in a slot where the PRS resource overlaps with an uplink subband are ignored.12.The method according to any of claims 1 to 6, wherein the PRS on the PRS resource in a slot where the PRS resource overlaps with an uplink subband is received by the UE, if and only if uplink signal is not transmitted in the slot.13.The method according to any of claims 1 to 6, wherein the PRS on the PRS resource in a slot where the PRS resource overlaps with an uplink transmission occasion in an uplink subband is received by the UE, if and only if uplink signal is not transmitted in the uplink transmission occasion in the slot, of which an uplink channel or signal whose priority is prioritized over a given priority threshold.14.The method according to claim 13, wherein the priority threshold is configured to the UE by radio resource control (RRC) signaling.15.The method according to any of claims 1 to 6, wherein a time-domain prioritization pattern is configured to the UE, the time-domain prioritization pattern identifies a set of time durations in which downlink reception of the PRS is prioritized over uplink transmission in uplink subband, and prioritization between overlapping PRS reception and uplink transmission in the uplink subband in a slot is determined based on how the slot falls into the time-domain prioritization pattern.16.The method according to any of claims 1 to 6, wherein information of all PRS time-domain resource allocations that the UE can observe is transferred to a base station that serves the UE and operates an uplink subband.17.The method according to any of claims 1 to 6, wherein information of all uplink subband allocations that can be observed by the UE requesting a positioning service is transferred to a network node configuring the PRS resources.18.The method according to claim 17, wherein information of time-domain allocation of uplink subbands is included in either a provide capabilities message or a request assistance data message that is sent from the UE to the network node.19.The method according to claim 18, wherein the provide capabilities message or the request assistance data message that is sent from the UE to the network node complies with a LTE positioning protocol (LPP) .20.The method according to any of claims 17 to 19, wherein the network node comprises a location management function (LMF) server.21.A method for a base station (BS) to transmit positioning reference signal (PRS) , comprising:sending to a user equipment (UE) configuration information, which is used for configuring one or more PRS muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted;transmitting PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands; andtransmitting the PRS on remaining PRS resource elements with non-zero transmission power.22.The method according to claim 21, wherein the PRS muting subband spans over a configurable number of consecutive physic resource blocks (PRBs) starting from a configurable starting PRB in frequency domain and a configurable number of consecutive slots starting from a configurable starting slot in time domain.23.The method according to claim 21 or 22, wherein the configuration information comprises frequency domain dimension configuration information of the one or more PRS muting subbands, the frequency domain dimension configuration information contains information of a PRS reference point, a starting PRB index in relative to the PRS reference point, and either an ending PRB index in relative to the PRS reference point or a number of consecutive PRBs in the PRS muting subband.24.The method according any of claims 21 to 23, wherein the configuration information comprises time domain dimension configuration information of the one or more PRS muting subbands, the time domain dimension configuration contains information of a PRS muting subband periodicity in unit of slot, a PRS muting subband periodicity offset in unit of slot, a starting slot index, and either an ending slot index or a number of consecutive slots spanned by the PRS muting subband.25.The method according to claim 24, wherein the starting slot index or the ending slot index of the PRS muting subband in format of is given by: whereinrepresents a slot index in a radio frame for a given subcarrier spacing numerology μ, nf represents a radio frame index, represents a number of slots in the radio frame for the given subcarrier spacing numerology μ, represents the PRS muting subband periodicity, represents the PRS muting subband periodicity offset, and represents either the starting slot index or the ending slot index.26.The method according to any of claims 21 to 25, wherein if the PRS resource with PRS bandwidth equal to is not identified as muted but overlaps with the PRS muting subband with subband bandwidth equal to the non-zero transmission power on the PRS resource element equals to PRS energy-per-resource-element (EPRE) powermultiplied by where the PRS EPRE power is a power in the case that the PRS resource does not overlap with any of the configured PRS muting subbands.27.The method according to any of claims 21 to 26, wherein information of all PRS time-domain resource allocations that the UE can observe is received by the base station that serves the UE and operates an uplink subband.28.The method according to claim 27, further comprising:sending a request message to a network node to request the information of all the PRS time-domain resource allocations that can be informed to the UE served by the base station; andreceiving from the network node a respond message which provides the information of time-domain allocations of the PRS resources.29.The method according to claim 27, wherein a notification message is received from a network node without a request by the base station, and the notification message comprises a message element for time-domain allocation information of the PRS resources.30.The method according to claim 29, wherein the notification message comprises an observed-time-difference-of-arrival (OTDOA) information request message.31.The method according to any of claims 21 to 26, wherein information of all uplink subband allocations that can be observed by the UE requesting a positioning service is transferred to a network node configuring the PRS resources.32.The method according to claim 31, wherein an OTDOA information response message is sent to the network node to provide information of time-domain allocation of uplink subbands.33.The method according to any of claims 28 to 32, wherein the network node comprises a location management function (LMF) server.34.A user equipment (UE) , comprising:a configuration receiving module, configured to receive configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; anda PRS receiving module, configured to receive PRS that is transmitted on a PRS resource element comprised in the configured PRS resource with non-zero transmission power, if the PRS resource element does not belong to any PRS resource that is identified as muted and the PRS resource element does not fall into any of the configured PRS muting subbands.35.A base station (BS) , comprising:a configuration sending module, configured to send to a user equipment (UE) configuration information, which is used for configuring one or more positioning reference signal (PRS) muting subbands and a periodic PRS resource set that contains one or more PRS resources where each of the PRS resources can be identified as muted; anda PRS transmitting module, configured to transmit PRS on a PRS resource element comprised in the configured PRS resource with zero transmission power, if the PRS resource element either belongs to one of the PRS resources that is identified as muted or falls into one of the configured PRS muting subbands, wherein the PRS transmitting module is further configured to transmit the PRS on remaining PRS resource elements with non-zero transmission power.36.A user equipment (UE) , comprising:at least one memory configured to store program instructions; andat least one processor configured to execute the program instructions, which cause the at least one processor to execute the method of any of claims 1 to 20.37.A base station (BS) , comprising:at least one memory configured to store program instructions; andat least one processor configured to execute the program instructions, which cause the at least one processor to execute the method of any of claims 21 to 33.38.A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to execute the method of any one of claims 1 to 20 or the method of any one of claims 21 to 33.39.A chip, comprising:a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any one of claims 1 to 20 or the method of any one of claims 21 to 33.40.A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20 or the method of any one of claims 21 to 33.41.A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20 or the method of any one of claims 21 to 33.42.A computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20 or the method of any one of claims 21 to 33.