Timing requirements for asymmetric TRP operation
The UE in asymmetric TRP scenarios determines uplink timing and applies network-configured adjustments to ensure accurate uplink transmissions by using separate timing advances and pathloss offsets, addressing transmission errors in asymmetric TRP operations.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-01
- Publication Date
- 2026-04-09
AI Technical Summary
In asymmetric multi-Transmission and Reception Point (TRP) operation scenarios, determining uplink timing and applying gradual timing adjustments for uplink-only TRPs is challenging due to the absence of downlink reference timing, leading to potential transmission errors.
A user equipment (UE) determines uplink timing for each TRP based on a single downlink reference timing using separate timing advance values and pathloss offsets, and applies gradual timing adjustments as configured by the network, either dynamically or upon receiving specific signaling.
This approach ensures accurate uplink timing and reduces transmission errors in asymmetric TRP scenarios by leveraging network-configured timing advances and adjustments, enhancing communication reliability.
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Figure CN2024123146_09042026_PF_FP_ABST
Abstract
Description
Timing Requirements for Asymmetric TRP OperationBackground
[0001] A user equipment (UE) may connect to a network via a base station. The base station may control multiple transmission and reception points (TRPs) . The UE may operate in multi-TRP (mTRP) mode where the UE establishes and maintains a connection with multiple TRPs at the same time.
[0002] In some scenarios, the mTRP operation may be asymmetric with respect to a UE. For example, there may be a scenario where the UE is communicating with two TRPs. The UE may have uplink (UL) communications with both TRPs but only downlink (DL) communications with one of the TRPs. This may be referred to as asymmetric TRP operation.Summary
[0003] Some example embodiments are related to an apparatus having processing circuitry configured to process, based on signals received from a serving cell, a first timing advance (TA) associated with a first TA group (TAG) for a first transmission and reception point (TRP) and a second TA associated with a second TAG for a second TRP, wherein the apparatus is configured to communicate with the first TRP in an uplink (UL) and a downlink (DL) and communicate with the second TRP only in the UL, determine a DL reference timing based on reference signals received in the DL from the first TRP, determine a first UL timing for transmitting to the first TRP in the UL based on the first TA and the DL reference timing and determine a second UL timing for transmitting to the second TRP in the UL based on the second TA and the DL reference timing.
[0004] Other example embodiments are related to an apparatus having processing circuitry configured to generate, for transmission to a user equipment (UE) , a multi-transmission and reception point (mTRP) configuration comprising configuring the UE to communicate with a first TRP in an uplink (UL) and a downlink (DL) and communicate with a second TRP only in the UL and generate, for transmission to the UE, a first timing advance (TA) associated with a first TA group (TAG) for the first TRP and a second TA associated with a second TAG for the second TRP.Brief Description of the Drawings
[0005] Fig. 1 shows an example network arrangement according to various example embodiments.
[0006] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0007] Fig. 3 shows an example base station according to various example embodiments.
[0008] Fig. 4 shows an example system arrangement where a UE is communicating with an asymmetric mTRP arrangement according to various example embodiments.
[0009] Fig. 5 shows an example timing diagram for an asymmetric mTRP scenario according to various example embodiments.
[0010] Fig. 6 shows an example method for determining UL timing in the asymmetric mTRP scenario according to various example embodiments.
[0011] Fig. 7 shows an example method 700 for determining whether to apply a gradual timing adjustment to UL timing in the asymmetric mTRP scenario according to various example embodiments.Detailed Description
[0012] The 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 relate to asymmetric TRP operation. Specifically, the example embodiments relate to determining an uplink (UL) timing for TRPs in an asymmetric TRP scenario and determining whether a gradual timing adjustment is to be applied to the UL timing for a TRP where there is only UL communications.
[0013] The example embodiments are described with regard to a user equipment (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 appropriate type of electronic component.
[0014] The example embodiments are also described with regard to a fifth generation (5G) New Radio (NR) network and a next generation node B (gNB) . However, reference to a 5G NR network and a gNB is merely provided for illustrative purposes. The example embodiments may be utilized with any appropriate type of network (e.g., 5G Advanced, 6G, etc. ) and base station.
[0015] The gNB may be configured with multiple transmission and reception points (TRPs) . Throughout this description, a TRP generally refers to a set of components configured to transmit and / or receive a beam. In some embodiments, multiple TRPs may be deployed locally at the gNB. For example, the gNB may include multiple antenna arrays / panels that are each configured to generate a different beam. In other embodiments, multiple TRPs may be deployed at various different locations and connected to the gNB via a backhaul connection. For example, multiple small cells may be deployed at different locations and connected to the gNB. However, these examples are merely provided for illustrative purposes. TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios. Thus, any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes. The TRPs described herein may represent any type of network component configured to transmit and / or receive a beam.
[0016] The example embodiments describe operations for asymmetric mTRP operation, including operations for a UE to determine the UL timing for both TRPs in the asymmetric TRP scenario and determine whether the UE is to apply a gradual timing adjustment to the UL timing for the TRP where the UE is only communicating with the TRP in the UL. The operations also include a base station (e.g., serving cell) configuring the UE with information to determine the UL timing and configuring the UE with a gradual timing adjustment configuration for the TRP where the UE is only communicating with the TRP in the UL. These and other example embodiments are described in greater detail below.
[0017] 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.
[0018] 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 5G NR radio access network (RAN) 120. However, the UE 110 may also communicate with other types of networks (e.g., sixth generation (6G) 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 5G NR RAN 120. Therefore, the UE 110 may have at least a 5G NR chipset to communicate with the 5G NR RAN 120.
[0019] The 5G NR 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 5G NR 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.
[0020] In the network arrangement 100, the 5G NR RAN 120 deploys a gNB 120A. The gNB 120A may be configured with multiple TRPs. Each TRP may represent one or more components configured to transmit and / or receive a signal. In some embodiments, multiple TRPs may be deployed locally at the gNB 120A. In other embodiments, multiple TRPs may be distributed at different locations and connected to the gNB 120A via a backhaul connection. For example, multiple small cells may be deployed at different locations and connected to the gNB 120A. However, these examples are merely provided for illustrative purposes. TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios. Thus, any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes. The TRPs described herein may represent any type of network component configured to transmit and / or receive a beam.
[0021] Any association procedure may be performed for the UE 110 to connect to the 5G NR RAN 120. For example, as discussed above, the 5G NR RAN 120 may be associated with a particular cellular provider 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 5G NR RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 5G NR RAN
[0022] 120. More specifically, the UE 110 may associate with a specific base station, e.g., the gNB 120A.
[0023] 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 may refer to an interconnected set of components that manages the operation and traffic of the cellular network. It may include the evolved packet core (EPC) and / or the 5G core (5GC) . The cellular core network 130 also 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.
[0024] 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 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, an audio input device, an audio output device, a power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, etc.
[0025] The processor 205 may be configured to execute a plurality of engines of the UE 110. For example, the engines may include an asymmetric mTRP engine 235 that may perform various operations related to asymmetric mTRP operation. To provide some general examples, the asymmetric mTRP engine 235 may perform operations such as, but not limited to, determining UL timing for UL transmissions to TRPs in the asymmetric mTRP scenario and determining whether a gradual timing adjustment is to be applied to the UL timing. These operations are described in greater detail below.
[0026] The above referenced engine 235 being applications (e.g., a program) executed by the processor 205 is merely provided for illustrative purposes. The functionality associated with the engine 235 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.
[0027] 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.
[0028] The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, 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.
[0029] Fig. 3 shows an example base station 300 according to various example embodiments. The base station 300 may represent the gNB 120A or any other type of access node through which the UE 110 may establish a connection and manage network operations.
[0030] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, multiple TRPs 330 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, TxRUs, transceiver chains, antenna elements, antenna panels, etc.
[0031] As indicated above, in some scenarios, the multiple TRPs 330 may be deployed locally at the base station 300. In other scenarios, one or more of the multiple TRPs 330 may be deployed at physical locations remote from the base station 300 and connected to the base station via a backhaul connection. The base station 300 may be configured to control the multiple TRPs 330 and perform operations such as, but not limited to, assigning resources, configuring reference signals, implementing beam management techniques, etc.
[0032] The processor 305 may be configured to execute a plurality of engines for the base station 300. For example, the engines may include an asymmetric mTRP configuration engine 335 that may perform various operations related to asymmetric mTRP operation. To provide some general examples, the asymmetric mTRP configuration engine 335 may perform operations such as, but not limited to, configuring a UE with information to determine UL timing in the asymmetric mTRP scenario and configuring the UE with a configuration for gradual timing adjustments. These operations are described in greater detail below.
[0033] The above noted engine 335 being applications (e.g., a program) executed by the processor 305 is only an example. The functionality associated with the engine 335 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. In addition, in some base stations, the functionality described for the processor 305 is split among a plurality of processors (e.g., a baseband processor, an applications processor, etc. ) . The example embodiments may be implemented in any of these or other configurations of a base station.
[0034] 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.
[0035] The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UEs 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 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 signals (e.g., signaling from a UE) for implementing any one of the methods described herein.
[0036] Fig. 4 shows an example system arrangement 400 where a UE 110 is communicating with an asymmetric mTRP arrangement according to various example embodiments. In the example of Fig. 4, the UE 110 is communicating with a first TRP 410 and a second TRP 420. The UE 110 is communicating in both the DL and UL with the TRP 410. However, the UE 110 is only communicating in the UL with the TRP 420. The TRPs 410 and 420 may be associated with a base station (e.g., base station 300) that may be a serving cell for the UE 110 in this scenario.
[0037] When a UE is operating in both the UL and the DL with a TRP, e.g., the UE 110 operating with TRP 410, the UE may use the timing from DL communications (e.g., reference signals transmitted by the TRP 410) as a reference timing for UL transmissions. However, in the asymmetric scenario shown in Fig. 4, the UE 110 does not receive any DL transmissions from the TRP 420. Thus, there is no DL reference timing for the UP transmissions to the TRP 420.
[0038] In one aspect, the example embodiments provide operations for a UE to determine UL timing from a single DL reference timing in an asymmetric mTRP UL / sTRP DL scenario as shown in Fig. 4.
[0039] A timing advance (TA) is a command sent by a base station to provide information to a UE for adjusting uplink transmission timing by the UE, e.g., the serving cell operating TRPs 410 and 420 in Fig. 4 may send TA commands to the UE 110. In the example embodiments, the UE operating may be provided with two (2) TAs, e.g., one for each of the TRP 410 and TRP 420. This may be referred to as supporting 2 Timing Advance Groups (TAGs) per serving cell.
[0040] A transmission configuration in indicator (TCI) may be a parameter that indicates a transmission configuration for the UE, e.g., number of layers, modulation and coding scheme (MC) , etc. The TCI state may be for the UL or the DL or may be a joint TCI state that applies to both the UL and DL.
[0041] In the example embodiments, the DL reference timing for the UL to both TRPs may be based on the DL reference signals from the DL only TRP, e.g., the reference signals received from the TRP 410 in the DL. For example, the UE 110 may receive reference signals in DL communications from the TRP 410 associated with the DL or joint TCI state. The UE 110 may then use the timing of the reference signals to determine the UL timing for separate transmissions to the TRP 410 and 420.
[0042] In the example embodiments, the UL timing for the TRP 410 and 420 may be different even though the DL reference timing used to determine the UL timing is the same. For each TAG, the UL timing may be determined as: (NTA+NTAoffset) *Tc, where
[0043] NTA is the timing advance,
[0044] NTAoffset is a pathloss offset, and
[0045] Tc is a constant timing value defined in the 3GPP standards.
[0046] In the example embodiments, the network (e.g., serving cell) may configure NTA separately for each TAG, e.g., the NTA1 for TRP 410 may be different than the NTA2 for the TRP 420. The network may configure the NTAoffset to be the same for both TRPs in the intra-cell scenario, e.g., the same serving cell is controlling TRPs 410 and 420 as in the example of Fig. 4. However, in other example embodiments, the NTAoffset may also be configured separately for each TAG. The pathloss offset may be used by the UE to determine a pathloss for the TRP 420 based on pathloss reference signals received from the TRP 410 and the pathloss offset.
[0047] Thus, for the TRP 410, the UL timing may be determined based on: (NTA1+NTAoffset) *Tc
[0048] while the UL timing for the TRP 420 may be determined based on:
[0049] (NTA2+NTAoffset) *Tc
[0050] Fig. 5 shows an example timing diagram 500 for an asymmetric mTRP scenario according to various example embodiments. The example timing diagram 500 is described with reference to the asymmetric mTRP scenario of Fig. 4, e.g., the DL transmission timing 510 is for transmissions from the TRP 410 to the UE 110, the UL transmission timing 520 is for transmissions from the UE 110 to the TRP 410 and the UL transmission timing 530 is for transmissions from the UE 110 to the TRP 420.
[0051] In example the example timing diagram 500, the line 505 may represent a slot boundary for the DL transmission timing 510. The UL timing may be calculated from this slot boundary and since the UL transmissions are before the DL transmissions, the start of the timing for the UL transmissions 520 and 530 is before the slot boundary 505 of the DL transmissions.
[0052] In the example timing diagram 500, the UL transmission timing 520 and 530 may be for UL transmissions that occur later in time, e.g., in subsequent slots, and the calculated timing is used for these subsequent UL transmissions. For example, based on the reference signals, included in the DL transmission 510, the UE 110 may determine the UL timing 520 for UL transmissions to the TRP 410 and the UL timing 530 for UL transmissions to the TRP 430.
[0053] As described above, the network may configure the UE 110 with separate NTAvalues for both the TRPs 420 and 430. The network may also configure the UE 110 with the NTAoffset value. As described above, the UE 110 knows the value of Tc because it is defined by standards, e.g., 3GPP Technical Specifications (TS) . The UE 110 may then determine the UL timing 520 and 530 based on the equations described above and also shown in Fig. 5. The UE 110 may then apply this timing to UL transmissions to the TRPs 410 and 420 that occur in a later slot, e.g., 4 slots later.
[0054] Fig. 6 shows an example method 600 for determining UL timing in the asymmetric mTRP scenario according to various example embodiments. The method 600 may be performed by the UE 110 in the asymmetric mTRP scenario of Fig. 4.
[0055] In 610, the network (e.g., serving cell) may configure the UE 110 with individual TA values (e.g., NTA. ) for the TAG 1 (TRP 410) and the TAG 2 (TRP 420) . The UE 110 may also receive the value (s) for the NTAoffset for the TAG 1 and TAG 2. In 620, the UE 110 may determine the DL reference timing based on DL transmissions from the TRP 410, e.g., based on reference signals received in the DL from TRP 410.
[0056] In 630, the UE 110 may calculate the UL timing for both the TAG 1 and the TAG 2 using, for example, the equations provided above. In 640, the UE 110 may apply the calculated timing to UL transmissions to the TRP 410 (e.g., UL timing calculated for TAG 1) and UL transmissions to the TRP 420 (e.g., UL timing calculated for TAG 2) .
[0057] Thus, in the example embodiments, the UE 110 may determine the UL timing for both TRPs in the asymmetric mTRP scenario based on the DL reference timing from the TRP sending DL transmissions and from information configured by the network.
[0058] In another aspect, the example embodiments provide operations for a UE to determine whether to apply a gradual timing adjustment to UL timing for a TRP where only UL transmissions are occurring in the asymmetric TRP scenario.
[0059] A gradual timing adjustment may be a feature where a UE adjusts the UL timing when a transmission timing error exceeds a predetermined threshold (Te) . The Te for different scenarios (e.g., frequency range, subcarrier spacing, etc. ) are define by standard, e.g., 3GPP TS 38.133. When the transmission timing error exceeds ±Te, the UE may apply a gradual timing adjustment to the UL timing to remain within ±Te. However, because the UL timing in the asymmetric mTRP scenario is based on a DL timing from another TRP for the UL only TRP, there may be issues with applying gradual timing adjustments.
[0060] The example embodiments provide operations for the UE to determine whether and how to apply gradual timing adjustment to the UL timing for the UL only TRP in the asymmetric mTRP scenario.
[0061] In some example embodiments, the UE may not apply gradual timing adjustments in this scenario. Rather, the UE may waits for a TA command for the second TAG (e.g., the UL only TAG) for any UL timing adjustment.
[0062] In other example embodiments, the network (e.g., serving cell) may indicate to the UE if gradual timing adjustment should be applied to the UL only TRP. For example, the indication may be received by the UE in a Medium Access Control Control Element (MAC CE) or Downlink Control Information (DCI) when the indication is applied dynamically. The indication may also be received in Radio Resource Control (RRC) signaling when the indication of gradual timing adjustment is always to be applied.
[0063] In further example embodiments, the network (e.g., serving cell) may dynamically indicate when to start / stop applying a gradual timing adjustment. Again, this indication may be received via MAC-CE or DCI.
[0064] Fig. 7 shows an example method 700 for determining whether to apply a gradual timing adjustment to UL timing in the asymmetric mTRP scenario according to various example embodiments. The method 700 may be performed by the UE 110 in the asymmetric mTRP scenario of Fig. 4. In the example of method 700, the determination by the UE 110 is whether to apply the gradual timing adjustment to the UL only TRP 420. Thus, when referring to the TAG, it is assumed that the network configured the TAG 2 for the UL only TRP 420.
[0065] In 710, the UE 110 may calculate the UL timing for the TAG 2, e.g., UL transmissions to the TRP 420. Example manners of calculating the UL timing were described above with reference to Fig. 6. In 720, the UE 110 determines the UL timing error exceeds the predetermined error threshold (Te) .
[0066] In 730, the UE 110 determines whether a gradual timing adjustment should be applied to the UL timing based on the timing error exceeding Te. As described above, in some example embodiments, the UE 110 may be configured to not apply the gradual timing adjustment but wait, in 740, for a new TAG 2 NTA value to calculate the new UL timing.
[0067] In other example embodiments, the UE 110 may be configured by the network to apply the gradual timing adjustment at all times or during certain times. When the UE 110 is configured to apply the gradual timing adjustment, the UE 110, in 750, may apply the gradual timing adjustment to the calculated UL timing.
[0068] Thus, in the example embodiments, the UE 110 may be configured by the network to apply or not apply the gradual timing adjustment to the UL timing.
[0069] Examples
[0070] In a first example, a method, comprising processing, based on signals received from a serving cell, a first timing advance (TA) associated with a first TA group (TAG) for a first transmission and reception point (TRP) and a second TA associated with a second TAG for a second TRP, wherein the apparatus is configured to communicate with the first TRP in an uplink (UL) and a downlink (DL) and communicate with the second TRP only in the UL, determining a DL reference timing based on reference signals received in the DL from the first TRP, determining a first UL timing for transmitting to the first TRP in the UL based on the first TA and the DL reference timing and determining a second UL timing for transmitting to the second TRP in the UL based on the second TA and the DL reference timing.
[0071] In a second example, the method of first example, further comprising processing, based on signals received from the serving cell, a pathloss offset and determining a pathloss for the second TRP based on pathloss reference signals received from the first TRP and the pathloss offset,
[0072] In a third example, the method of first example, wherein the reference signals are associated with a DL transmission configuration indicator (TCI) state or a joint TCI state.
[0073] In a fourth example, the method of first example, further comprising generating, for transmission to the first TRP, a UL transmission to be transmitted using the first UL timing.
[0074] In a fifth example, the method of first example, further comprising generating, for transmission to the second TRP, a UL transmission to be transmitted using the second UL timing
[0075] In a sixth example, the method of first example, further comprising processing, based on signaling from the serving cell, a gradual timing adjustment configuration to be applied to the second UL timing.
[0076] In a seventh example, the method of sixth example, further comprising determining a timing error for the second UL timing exceeds a predetermined timing error threshold.
[0077] In an eighth example, the method of seventh example, wherein, when the gradual timing adjustment configuration indicates that a gradual timing adjustment is not to be applied to the second UL timing, the method further comprising determining not to apply gradual timing adjustment to the second UL timing and adjusting the second UL timing based on a third TA associated with the second TAG for the second TRP
[0078] In a ninth example, the method of seventh example, wherein, when the gradual timing adjustment configuration indicates that the gradual timing adjustment is to be applied to the second UL timing, the method further comprising applying gradual timing adjustment to the second UL timing.
[0079] In a tenth example, the method of ninth example, wherein the gradual timing adjustment configuration indicates a start or stop time for applying the gradual timing adjustment
[0080] In an eleventh example, the method of sixth example, wherein the gradual timing adjustment configuration is received via one of Medium Access Control Control Element (MAC CE) signaling, Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.
[0081] In a twelfth example, a processor configured to perform any of the methods of the first through eleventh examples.
[0082] In a thirteenth example, a user equipment (UE) configured to perform any of the methods of the first through eleventh examples.
[0083] In a fourteenth example, a method, comprising generating, for transmission to a user equipment (UE) , a multi-transmission and reception point (mTRP) configuration comprising configuring the UE to communicate with a first TRP in an uplink (UL) and a downlink (DL) and communicate with a second TRP only in the UL and generating, for transmission to the UE, a first timing advance (TA) associated with a first TA group (TAG) for the first TRP and a second TA associated with a second TAG for the second TRP
[0084] In a fifteenth example, the method of the fourteenth example, further comprising generating, for transmission to the UE, a pathloss offset to be applied for the first TRP and the second TRP
[0085] In a sixteenth example, the method of the fourteenth example, further comprising generating, for transmission to the UE via the first TRP, DL reference signals associated with a DL transmission configuration indicator (TCI) state or a joint TCI state.
[0086] In a seventeenth example, the method of the fourteenth example, further comprising generating, for transmission to the UE, a gradual timing adjustment configuration.
[0087] In an eighteenth example, the method of the seventeenth example, wherein the gradual timing adjustment configuration indicates that a gradual timing adjustment is not to be applied to a UL timing for the second TRP.
[0088] In a nineteenth example, the method of the seventeenth example, wherein the gradual timing adjustment configuration indicates that a gradual timing adjustment is to be applied to a UL timing for the second TRP.
[0089] In a twentieth example, the method of the nineteenth example, wherein the gradual timing adjustment configuration indicates a start or stop time for applying the gradual timing adjustment.
[0090] In a twenty first example, the method of the seventeenth example, wherein the gradual timing adjustment configuration is transmitted via one of Medium Access Control Control Element (MAC CE) signaling, Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.
[0091] In a twenty second example, a processor configured to perform any of the methods of the fourteenth through twenty first examples.
[0092] In a twenty third example, a base station configured to perform any of the methods of the fourteenth through twenty first examples.
[0093] 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. The example embodiments described above 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.
[0094] In some embodiments, a non-transitory computer-readable memory medium (e.g., a non-transitory memory element) may be configured so that it stores program instructions and / or data, where the program instructions, if executed by a computer system, cause the computer system to perform a method, e.g., any of a method embodiments described herein, or, any combination of the method embodiments described herein, or, any subset of any of the method embodiments described herein, or, any combination of such subsets.
[0095] In some embodiments, a device (e.g., a UE) may be configured to include a processor (or a set of processors) and a memory medium (or memory element) , where the memory medium stores program instructions, where the processor is configured to read and execute the program instructions from the memory medium, where the program instructions are executable to implement any of the various method embodiments described herein (or, any combination of the method embodiments described herein, or, any subset of any of the method embodiments described herein, or, any combination of such subsets) . The device may be realized in any of various forms.
[0096] Embodiments of the present invention may be realized in any of various forms. For example, in some embodiments, the present invention may be realized as a computer-implemented method, a computer-readable memory medium, or a computer system. In other embodiments, the present invention may be realized using one or more custom-designed hardware devices such as ASICs. In other embodiments, the present invention may be realized using one or more programmable hardware elements such as FPGAs.
[0097] Although this application described various embodiments each having different features in various combinations, those skilled in the art will understand that any of the features of one embodiment may be combined with the features of the other embodiments 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 embodiments.
[0098] 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.
[0099] 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 processing circuitry configured to:process, based on signals received from a serving cell, a first timing advance (TA) associated with a first TA group (TAG) for a first transmission and reception point (TRP) and a second TA associated with a second TAG for a second TRP, wherein the apparatus is configured to communicate with the first TRP in an uplink (UL) and a downlink (DL) and communicate with the second TRP only in the UL;determine a DL reference timing based on reference signals received in the DL from the first TRP;determine a first UL timing for transmitting to the first TRP in the UL based on the first TA and the DL reference timing; anddetermine a second UL timing for transmitting to the second TRP in the UL based on the second TA and the DL reference timing.2.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signals received from the serving cell, a pathloss offset; anddetermine a pathloss for the second TRP based on pathloss reference signals received from the first TRP and the pathloss offset.3.The apparatus of claim 1, wherein the reference signals are associated with a DL transmission configuration indicator (TCI) state or a joint TCI state.4.The apparatus of claim 1, wherein the processing circuitry is further configured to:generate, for transmission to the first TRP, a UL transmission to be transmitted using the first UL timing.5.The apparatus of claim 1, wherein the processing circuitry is further configured to:generate, for transmission to the second TRP, a UL transmission to be transmitted using the second UL timing.6.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling from the serving cell, a gradual timing adjustment configuration to be applied to the second UL timing.7.The apparatus of claim 6, wherein the processing circuitry is further configured to:determine a timing error for the second UL timing exceeds a predetermined timing error threshold.8.The apparatus of claim 7, wherein, when the gradual timing adjustment configuration indicates that a gradual timing adjustment is not to be applied to the second UL timing, the processing circuitry is further configured to:determine not to apply gradual timing adjustment to the second UL timing; andadjust the second UL timing based on a third TA associated with the second TAG for the second TRP.9.The apparatus of claim 7, wherein, when the gradual timing adjustment configuration indicates that the gradual timing adjustment is to be applied to the second UL timing, the processing circuitry is further configured to:apply gradual timing adjustment to the second UL timing.10.The apparatus of claim 9, wherein the gradual timing adjustment configuration indicates a start or stop time for applying the gradual timing adjustment.11.The apparatus of claim 6, wherein the gradual timing adjustment configuration is received via one of Medium Access Control Control Element (MAC CE) signaling, Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.12.An apparatus comprising processing circuitry configured to:generate, for transmission to a user equipment (UE) , a multi-transmission and reception point (mTRP) configuration comprising configuring the UE to communicate with a first TRP in an uplink (UL) and a downlink (DL) and communicate with a second TRP only in the UL; andgenerate, for transmission to the UE, a first timing advance (TA) associated with a first TA group (TAG) for the first TRP and a second TA associated with a second TAG for the second TRP.13.The apparatus of claim 12, wherein the processing circuitry is further configured to:generate, for transmission to the UE, a pathloss offset to be applied for the first TRP and the second TRP.14.The apparatus of claim 12, wherein the processing circuitry is further configured to:generate, for transmission to the UE via the first TRP, DL reference signals associated with a DL transmission configuration indicator (TCI) state or a joint TCI state.15.The apparatus of claim 12, wherein the processing circuitry is further configured to:generate, for transmission to the UE, a gradual timing adjustment configuration.16.The apparatus of claim 15, wherein the gradual timing adjustment configuration indicates that a gradual timing adjustment is not to be applied to a UL timing for the second TRP.17.The apparatus of claim 15, wherein the gradual timing adjustment configuration indicates that a gradual timing adjustment is to be applied to a UL timing for the second TRP.18.The apparatus of claim 17, wherein the gradual timing adjustment configuration indicates a start or stop time for applying the gradual timing adjustment.19.The apparatus of claim 15, wherein the gradual timing adjustment configuration is transmitted via one of Medium Access Control Control Element (MAC CE) signaling, Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.