Additional DMRS symbol configuration based on mobility status
Patent Information
- Application Number
- PCT/CN2025/085449
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025085449_01102026_PF_FP_ABST
Abstract
Description
Additional DMRS Symbol Configuration Based on Mobility StatusTechnical FieldThe present disclosure generally relates to wireless communication, and in particular, to additional DMRS symbol configuration based on mobility status.BackgroundDemodulation reference signal (DMRS) symbols may be used by a user equipment (UE) to decode physical downlink shared channel (PDSCH) . The number of DMRS symbols allocated by the network may vary for any of a variety of different reasons. For example, additional DMRS symbols may be allocated to account for UE mobility. However, additional DMRS symbols increase overhead and may not be necessary to achieve adequate performance in other scenarios. It has been identified that there is a need for mechanisms to support the dynamic allocation of additional DMRS symbols based on UE mobility.SummarySome example embodiments are related to an apparatus having memory coupled to processing circuitry, the processing circuitry configured to determine a mobility status for a user equipment (UE) , the mobility status associated with additional demodulation reference signal (DMRS) symbols, generate, for transmission to a network, a recommendation for the additional DMRS symbols, process, based on signaling received from the network, a number of additional DMRS symbols provided in response to the recommendation and process, based on signaling received from the network, physical downlink shared channel (PDSCH) using the number of additional DMRS symbols.Other example embodiments are related to an apparatus having memory coupled to processing circuitry, the processing circuitry configured to process, based on signaling received from a user equipment (UE) , a recommendation for additional demodulation reference signal (DMRS) symbols for physical downlink shared channel (PDSCH) and generate, for transmission to the UE, a number of additional DMRS symbols in response to the recommendation.Brief Description of the DrawingsFig. 1 shows an example network arrangement according to various example embodiments.Fig. 2 shows an example user equipment (UE) according to various example embodiments.Fig. 3 shows an example base station according to various example embodiments.Fig. 4 shows a method for dynamic allocation of additional demodulation reference signal (DMRS) symbols based on UE mobility according to various example embodiments.Detailed DescriptionThe example embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The example embodiments introduce techniques to support dynamic allocation of demodulation reference signal (DMRS) symbols based on user equipment (UE) mobility.The example embodiments are described with regard to a UE. However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any electronic component.The example embodiments are further described with regard to physical downlink shared channel (PDSCH) DMRS. A UE may use DMRS to decode PDSCH. However, the manner in which DMRS is used to decode PDSCH is beyond the scope of the example embodiments. Instead, the example embodiments relate to how additional DMRS symbols may be configured and dynamically allocated to the UE.Third Generation Partnership Project (3GPP) radio frequency (RF) enhancements set out to support an increased number of receiver (RX) chains in handheld and fixed wireless access (FWA) UEs. For example, requirements to enable UEs with 6 and 8 RX chains are being introduced for 3GPP networks. A larger number of RX chains may improve downlink coverage and provide other types of performance benefits but also introduce potential overhead issues with respect to the number of DMRS symbols that may be used to support optimal performance. The example embodiments introduce techniques to avoid excessive overhead that may occur due to additional DMRS symbols. While the example embodiments may provide benefits to UEs with a higher number of RX chains (e.g., 6, 8, 10, etc. ) , the example embodiments are not limited to these types of UEs and may be used by any appropriate type of UE in any appropriate type of deployment scenario.A network may configure or reconfigure the number of DMRS symbols for PDSCH via radio resource control (RRC) signaling. However, RRC signaling may be too time consuming to be used to dynamically adapt the number of DMRS symbols based on UE mobility in an efficient manner.In some scenarios, a DMRS 1+0 or 2+0 configuration may be used to support a higher number of Rx chains. However, these DMRS configurations may hinder mobility and high-speed deployment scenarios without a mechanism to dynamically switch away from these configurations. That is, it would be beneficial to implement these types of DMRS configurations if there is a valid mechanism from which the network can dynamically adapt DMRS symbol allocation based on a mobility and / or doppler status of the UE. The example embodiments introduce techniques to support the dynamic allocation of DMRS symbols.As will be described in more detail below, the example embodiments include the UE reporting its own mobility status to the network which allows the network to dynamically adapt the number of DMRS symbols for the UE. The example embodiments may be used independently from one another, in conjunction with other currently implemented mechanisms for additional DMRS symbol allocation, in conjunction with future implementations of mechanisms for additional DMRS symbol allocation or independently from other mechanisms for additional DMRS symbol allocation.Fig. 1 shows an example network arrangement 100 according to various example embodiments. The example network arrangement 100 includes a UE 110. The UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, phablets, embedded devices, wearables, Internet of Things (IoT) devices, etc. An actual network arrangement may include any number of UEs being used by any number of users. Thus, the example of a single UE 110 is merely provided for illustrative purposes.The UE 110 may be configured to communicate with one or more networks. In the example of the network arrangement 100, the network with which the UE 110 may wirelessly communicate is a 6G radio access network (RAN) 120. However, the UE 110 may also communicate with other types of networks (e.g., fifth generation (5G) RAN, 5G cloud RAN, a next generation RAN (NG-RAN) , a long-term evolution (LTE) RAN, a legacy cellular network, a wireless local area network (WLAN) , etc. ) and the UE 110 may also communicate with networks over a wired connection. With regard to the example embodiments, the UE 110 may establish a connection with the 6G RAN 120. Therefore, the UE 110 may have at least a 6G chipset to communicate with the 6G RAN 120. The UE 110 may also have other chipsets to communicate with other types of RANs, e.g., 5G chipset, LTE chipset, ISM chipset, etc.The 6G RAN 120 may be a portion of a cellular network that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) . The 6G RAN 120 may include base stations or access nodes (Node Bs, eNodeBs, HeNBs, eNBS, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set. As used herein, the term “base station, ” “access node, ” “access point, ” or the like may describe equipment that provides the radio baseband functions for data and / or voice connectivity between a network and one or more users. These access nodes may be referred to as BS, gNBs, RAN nodes, eNBs, NodeBs, RSUs, TRxPs or TRPs, and so forth, and may comprise ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell) . In fact, in some embodiments, a UE, such as UE 110 described herein, may function as an access point (e.g., FWA, etc. ) . In one example, the 6G RAN 120 includes the base station 120A that may be any appropriate base station or cell deployed in the 6G RAN 120 (e.g., Node Bs, eNodeBs, HeNBs, eNBs, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) .Any association procedure may be performed for the UE 110 to connect to the 6G RAN 120. For example, as discussed above, the 6G RAN 120 may be associated with a particular network carrier where the UE 110 and / or the user thereof has a contract and credential information (e.g., stored on a SIM card) . Upon detecting the presence of the 6G RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 6G RAN 120. More specifically, the UE 110 may associate with a specific cell (e.g., the base station 120A) .The network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 manages the traffic that flows between the cellular network and the Internet 140. The IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110. The network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130. The network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the UE 110 in communication with the various networks.Fig. 2 shows an example UE 110 according to various example embodiments. The UE 110 will be described with regard to the network arrangement 100 of Fig. 1. The UE 110 may represent any electronic device and may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 may include, for example, RX chains, an audio input device, an audio output device, a battery that provides a limited power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, sensors to detect conditions of the UE 110, etc.The processor 205 may be configured to execute a plurality of engines for the UE 110. For example, the engines may include an DMRS symbol configuration engine 235. The DMRS symbol configuration engine 235 may perform various operations related to the example embodiments introduced herein including, but not limited to, receiving DMRS symbol configuration information, determining a UE mobility status, reporting the UE mobility status and recommending a number of DMRS symbol required for reliable PDSCH reception.The above referenced engine 235 being an application (e.g., programs) executed by the processor 205 is only an example. The functionality associated with the engine may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engine may also be embodied as one application or separate applications. In addition, in some UEs, the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor. The example embodiments may be implemented in any of these or other configurations of a UE.The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to show data to a user while the I / O device 220 may be a hardware component that enables the user to enter inputs. The display device 215 and the I / O device 220 may be separate components or integrated together such as a touchscreen.
[0001] The transceiver 225 may be a hardware component configured to establish a connection with the 6G RAN 120, a 5G RAN (not pictured) , an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 225 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 205 may be operably coupled to the transceiver 225 and configured to receive from and / or transmit signals to the transceiver 225. The processor 205 may be configured to encode, decode and / or process signals (e.g., signaling from a base station of a network) for implementing any one of the methods described herein.Fig. 3 shows an example base station 300 according to various example embodiments. The base station 300 may represent the base station 120A or any other access node through which the UE 110 may establish a connection and manage network operations.The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, and other components 325. The other components 325 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and / or power sources, etc.The processor 305 may be configured to execute a plurality of engines. For example, the engines may include a DMRS symbol configuration engine 330. The DMRS symbol configuration engine 330 may perform various operations related to the example embodiments introduced herein including, but not limited to, transmitting DMRS symbol configuration information to the UE 110, receiving a UE mobility status, receiving a recommendation of a number of DMRS symbol required for reliable PDSCH reception and allocating a number of DMRS symbols to the UE 110.The above referenced engine 330 being an application (e.g., programs) executed by the processor 205 is only an example. The functionality associated with the engine may also be represented as a separate incorporated component of the base station 300 or may be a modular component coupled to the base station 300, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engine may also be embodied as one application or separate applications. In addition, in some base stations, the functionality described for the processor 305 is split among two or more processors such as a baseband processor and an applications processor. The example embodiments may be implemented in any of these or other configurations of a base station.The memory arrangement 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or ports that enable a user to interact with the base station 300.The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . Therefore, the transceiver 320 may include one or more components (e.g., radios) to enable the data exchange with the various networks and UEs. The transceiver 320 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 305 may be operably coupled to the transceiver 320 and configured to receive from and / or transmit signals to the transceiver 320. The processor 305 may be configured to encode, decode and / or process signals (e.g., signaling from a UE) for implementing any one of the methods described herein.Fig. 4 shows a method 400 for dynamic allocation of additional DMRS symbols based on UE mobility according to various example embodiments. The method 400 is described from the perspective of the UE 110 of Fig. 2.In 410, the UE 110 receives RRC configuration information from the network. The RRC configuration information may include parameters for PDSCH and PDSCH DMRS. To provide some non-limiting examples, the RRC configuration may include parameters for PDSCH symbol allocation, PDSCH slot allocation, resource block allocation, DMRS configuration type, DMRS antenna ports and additional DMRS positions.Generally, the RRC configuration information may indicate different possible configurations for DMRS and PDSCH that may be sent to the UE 110. Prior to the actual reception of PDSCH, the UE 110 may receive a signal from the network (e.g., DCI, medium access control (MAC) control element (CE) , etc. ) that indicates the actual DMRS and PDSCH configuration of subsequent communications. For example, the RRC configuration information may include a maximum length parameter that indicates that the network may schedule single-symbol or double-symbols DMRS to the UE 110 via DCI. The UE 110 may then receive DCI that indicates the number of DMRS symbols to be sent to the UE 110 for PDSCH reception.In legacy mechanisms, the DMRS additional position parameter semi-statically configures the UE 110 with a number of additional DMRS symbols for PDSCH. The network may then selectively schedule the additional DMRS symbols for any of a variety of different reasons. The network may perform RRC reconfiguration to change the additional DMRS configuration. However, RRC signaling may be too time consuming for the dynamic adaptation of additional DMRS symbols based on UE mobility.In 420, the UE 110 determines a mobility status. Throughout this description, the term “mobility status” refers to a condition or state of the UE 110 that indicates additional DMRS symbols may improve performance with respect to PDSCH reception. For example, when the UE 110 is considered to be in a mobility condition, this mobility status may indicate that additional DMRS symbols may improve performance. When the UE 110 is considered to be in a stationary condition, this mobility status may indicate that additional DMRS symbols are not needed.In one approach, the mobility status may be determined based on signal strength. The UE 110 may be provided with a measurement time parameter that indicates a time duration during which the UE 110 may evaluate the mobility status. The UE 110 may also be provided with one or more reference signal received power (RSRP) thresholds. These parameters may be hard encoded in standards (e.g., 3GPP Technical Specification (TS) ) , included in the RRC configuration information or provided to the UE 110 in any other appropriate manner.The UE 110 may measure RSRP corresponding to one or more cells. If the measured RSRP is greater than the corresponding RSRP threshold, the UE 110 may be considered to be in a mobility condition. If the measured RSRP is less than the corresponding RSRP threshold, the UE 110 may be considered to be in a stationary condition. In some examples, there may be multiple RSRP thresholds with each threshold corresponding to a different mobility status. For instance, there may be one RSRP threshold for a first mobility condition (e.g., low mobility, medium mobility, high mobility, etc. ) and another RSRP threshold for a second mobility condition. Each mobility status may correspond to a different number of additional DMRS symbols. For example, if the UE 110 is in a medium mobility condition a first number of additional DMRS symbols may be used and if the UE 110 is in a high mobility condition a second number of additional DMRS symbols may be used that is more than the first number of additional DMRS symbols.In another approach, the mobility status may be determined based on cell changes (e.g., handover, cell reselection, etc. ) . The UE 110 may be provided with an evaluation time parameter that indicates a time duration during which cell changes are to be tracked by the UE 110. The UE 110 may also be provided with one or more threshold values. These parameters may be hard encoded, included in the RRC configuration information or provided to the UE 110 in any other appropriate manner.The UE 110 may track a number of cell changes during the time evaluation time duration. If a number of cell changes is greater than the corresponding threshold, the UE 110 may be considered to be in a mobility condition. If the number of cell changes is less than the corresponding threshold, the UE 110 may be considered to be in a stationary condition. In some examples, there may be multiple thresholds with each threshold corresponding to a different number of additional DMRS symbols. For instance, there may be one RSRP threshold for a first mobility condition (e.g., low mobility, medium mobility, high mobility, etc. ) and another RSRP threshold for a second mobility condition.In 430, the UE 110 reports an additional DMRS recommendation to the network. The UE 110 may report the additional DMRS recommendation to the network at a given periodicity that may be hard encoded in standards, provided to the network in the RRC configuration information or provided to the UE 110 in any other appropriate manner.In one approach, the UE 110 may make an implicit recommendation. For example, the UE 110 may report the mobility status (e.g., stationary, low mobility, medium mobility, high mobility etc. ) . In this example, the network may determine a number of additional DMRS to provide to the UE 110 based on the reported mobility status.In another approach, the UE 110 may make an explicit recommendation. For example, the UE 110 may be configured to send a message with a field configured to provide a binary indication. The binary indication may indicate that additional DMRS is being requested. The network may then determine a number for additional DMRS to provide to the UE 110 based on the request. In another example, the UE 110 may be configured to send a message includes a number of additional DMRS symbols. The network may then determine to provide the UE 110 the requested number of DMRS symbols.In 440, the UE 110 receives DCI scheduling PDSCH. In this example, the network indicates to the UE 110 that additional DMRS symbols are to be provided for the PDSCH in response to the additional DMRS symbol recommendation in 430. However, in an actual deployment scenario, the network may determine not to provide the additional DMRS symbols. In 450, the UE 110 receives the DMRS and PDSCH.In one approach, the network provides additional DMRS symbols in accordance with the additional DMRS symbol configuration provided in the RRC configuration information. However, in contrast to the legacy mechanism, the additional DMRS symbols are provided in response to the recommendation provided by the UE 110 in 430.In another approach, a dynamic indication of additional DMRS symbols for the PDSCH may be provided to the UE. The dynamic indication may be provided via DCI or a MAC CE.The dynamic indication may be provided independently from any RRC configuration parameter associated with additional DMRS symbols. In one example, the RRC configuration information may not include the DMRS additional position parameter. In another example, the RRC configuration information does include the DMRS additional position parameter, but the dynamic indication is not required to be a number of DMRS symbols that is included the DMRS additional position parameter. Thus, the network may provide the UE 110 with any number of additional DMRS symbols without having to perform an RRC reconfiguration.In some examples, the dynamic indication is provided per DCI or MAC CE. In other examples, the dynamic indication may be applied for a fixed duration. The fixed duration may be indicated by the network in the DCI, the MAC CE or in any other appropriate manner. The fixed duration may be measured in units of time, a number of slots or in any other appropriate manner.ExamplesIn a first example, a method, comprising determining a mobility status for a user equipment (UE) , the mobility status associated with additional demodulation reference signal (DMRS) symbols, generating, for transmission to a network, a recommendation for the additional DMRS symbols; processing, based on signaling received from the network, a number of additional DMRS symbols provided in response to the recommendation and processing, based on signaling received from the network, physical downlink shared channel (PDSCH) using the number of additional DMRS symbols.In a second example, the method of the first example, wherein the mobility status is based on one or more reference signal received power (RSRP) thresholds and each of the one or more RSRP thresholds corresponds to a different mobility condition.In a third example, the method of the second example, wherein each mobility condition corresponds to a different number of additional DMRS symbols.In a fourth example, the method of the second example, further comprising processing, based on signaling received from the network, the one or more RSRP thresholds.In a fifth example, the method of the first example, wherein the mobility status is based on one or more thresholds for cell changes or handovers and each of the one or more thresholds for cell changes or handovers correspond to a different mobility condition.In a sixth example, the method of the fifth example, wherein each mobility condition corresponds to a different number of additional DMRS symbols.In a seventh example, the method of the fifth example, further comprising processing, based on signaling received from the network, the one or more thresholds for cell changes or handovers.In an eighth example, the method of the first example, wherein the recommendation for the additional DMRS symbols includes an indication of the UE mobility status.In a ninth example, the method of the eighth example, wherein the recommendation for the additional DMRS symbols is transmitted to the network based on a predefined periodicity.In a tenth example, the method of the first example, wherein the recommendation for the additional DMRS symbols is a binary indication associated with a radio resource control (RRC) configuration for additional DMRS positions.In an eleventh example, the method of the first example, wherein the recommendation for the additional DMRS symbols includes the number of additional DMRS symbols.In a twelfth example, the method of the first example, further comprising processing, based on signaling received from the network, radio resource control (RRC) configuration information comprising an additional DMRS position parameter, wherein the number of additional DMRS symbols provided in response to the recommendation is based on the additional DMRS position parameter.In a thirteenth example, the method of the first example, further comprising processing, based on signaling received from the network, downlink control information (DCI) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.In a fourteenth example, the method of the thirteenth example, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable to a single DCI.In a fifteenth example, the method of the thirteenth example, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable for a fixed duration.In a sixteenth example, the method of the fifteenth example, wherein the fixed duration is based on a unit of time or a number of slots.In a seventeenth example, the method of the first example, further comprising processing, based on signaling received from the network, medium access control (MAC) control element (CE) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.In an eighteenth example, a processor configured to perform any of the methods of the first through seventeenth examples.In a nineteenth example, a user equipment (UE) configured to perform any of the methods of the first through seventeenth examples.In a twentieth example, a method, comprising processing, based on signaling received from a user equipment (UE) , a recommendation for additional demodulation reference signal (DMRS) symbols for physical downlink shared channel (PDSCH) and generating, for transmission to the UE, a number of additional DMRS symbols in response to the recommendation.In a twenty first example, the method of the twentieth example, further comprising generating, for transmission to the UE, a message comprising one or more reference signal received power (RSRP) thresholds to be used by the UE to determine a mobility status of the UE, wherein the recommendation for the additional DMRS symbols is based on the mobility status of the UE.In a twenty second example, the method of the twentieth example, further comprising generating, for transmission to the UE, a message comprising one or more thresholds for a cell change or handover to be used by the UE to determine a mobility status of the UE, wherein the recommendation for the additional DMRS symbols is based on the mobility status of the UE.In a twenty third example, the method of the twentieth example, wherein the recommendation for the additional DMRS symbols includes an indication of a UE mobility status.In a twenty fourth example, the method of the twentieth example, wherein the recommendation for the additional DMRS symbols is a binary indication associated with a radio resource control (RRC) configuration for additional DMRS positions.In a twenty fifth example, the method of the twentieth example, wherein the recommendation for the additional DMRS symbols includes the number of additional DMRS symbols.In a twenty sixth example, the method of the twentieth example, further comprising generating, for transmission to the UE, radio resource control (RRC) configuration information comprising an additional DMRS position parameter, wherein the number of additional DMRS symbols provided in response to the recommendation is based on the additional DMRS position parameter.In a twenty seventh example, the method of the twentieth example, further comprising generating, for transmission to the UE, downlink control information (DCI) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.In a twenty eighth example, the method of the twenty seventh example, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable to a single DCI.In a twenty ninth example, the method of the twenty seventh example, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable for a fixed duration.In a thirtieth example, the method of the twenty ninth example, wherein the fixed duration is based on a unit of time or a number of slots.In a thirty first example, the method of the twentieth example, further comprising generating, for transmission to the UE, a medium access control (MAC) control element (CE) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.In a thirty second example, a processor configured to perform any of the methods of the twentieth through thirty first examples.In a thirty third example, a base station configured to perform any of the methods of the twentieth through thirty first examples.Those skilled in the art will understand that the above-described example embodiments may be implemented in any suitable software or hardware configuration or combination thereof. An example hardware platform for implementing the example embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc. In a further example, the example embodiments of the above-described method may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.Although this application described various aspects each having different features in various combinations, those skilled in the art will understand that any of the features of one aspect may be combined with the features of the other aspects in any manner not specifically disclaimed or which is not functionally or logically inconsistent with the operation of the device or the stated functions of the disclosed aspects.It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.It will be apparent to those skilled in the art that various modifications may be made in the present disclosure, without departing from the spirit or the scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalent.
Claims
1.An apparatus comprising memory coupled to processing circuitry, the processing circuitry configured to:determine a mobility status for a user equipment (UE) , the mobility status associated with additional demodulation reference signal (DMRS) symbols;generate, for transmission to a network, a recommendation for the additional DMRS symbols;process, based on signaling received from the network, a number of additional DMRS symbols provided in response to the recommendation; andprocess, based on signaling received from the network, physical downlink shared channel (PDSCH) using the number of additional DMRS symbols.2.The apparatus of claim 1, wherein the mobility status is based on one or more reference signal received power (RSRP) thresholds and each of the one or more RSRP thresholds corresponds to a different mobility condition.3.The apparatus of claim 2, wherein each mobility condition corresponds to a different number of additional DMRS symbols.4.The apparatus of claim 2, wherein the processing circuitry is further configured to:process, based on signaling received from the network, the one or more RSRP thresholds.5.The apparatus of claim 1, wherein the mobility status is based on one or more thresholds for cell changes or handovers and each of the one or more thresholds for cell changes or handovers correspond to a different mobility condition.6.The apparatus of claim 5, wherein each mobility condition corresponds to a different number of additional DMRS symbols.7.The apparatus of claim 5, wherein the processing circuitry is further configured to:process, based on signaling received from the network, the one or more thresholds for cell changes or handovers.8.The apparatus of claim 1, wherein the recommendation for the additional DMRS symbols includes an indication of the UE mobility status.9.The apparatus of claim 8, wherein the recommendation for the additional DMRS symbols is transmitted to the network based on a predefined periodicity.10.The apparatus of claim 1, wherein the recommendation for the additional DMRS symbols is a binary indication associated with a radio resource control (RRC) configuration for additional DMRS positions.11.The apparatus of claim 1, wherein the recommendation for the additional DMRS symbols includes the number of additional DMRS symbols.12.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, radio resource control (RRC) configuration information comprising an additional DMRS position parameter, wherein the number of additional DMRS symbols provided in response to the recommendation is based on the additional DMRS position parameter.13.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, downlink control information (DCI) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.14.The apparatus of claim 13, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable to a single DCI.15.The apparatus of claim 13, wherein the DCI comprising the indication of the number of additional DMRS symbols provided in response to the recommendation is applicable for a fixed duration.16.The apparatus of claim 15, wherein the fixed duration is based on a unit of time or a number of slots.17.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, medium access control (MAC) control element (CE) comprising an indication of the number of additional DMRS symbols provided in response to the recommendation.18.An apparatus comprising memory coupled to processing circuitry, the processing circuitry configured to:process, based on signaling received from a user equipment (UE) , a recommendation for additional demodulation reference signal (DMRS) symbols for physical downlink shared channel (PDSCH) ; andgenerate, for transmission to the UE, a number of additional DMRS symbols in response to the recommendation.19.The apparatus of claim 18, wherein the processing circuitry is further configured to:generate, for transmission to the UE, a message comprising one or more reference signal received power (RSRP) thresholds to be used by the UE to determine a mobility status of the UE, wherein the recommendation for the additional DMRS symbols is based on the mobility status of the UE.20.The apparatus of claim 18, wherein the processing circuitry is further configured to:generate, for transmission to the UE, a message comprising one or more thresholds for a cell change or handover to be used by the UE to determine a mobility status of the UE, wherein the recommendation for the additional DMRS symbols is based on the mobility status of the UE.