Patent Application
20240349199
The example and non-limiting embodiments relate generally to transmission power control and, more particularly, to varying transmission power control for multiple antennas.
Transmission power performance requirements are known in regard to antenna switching.
The following summary is merely intended to be an example. The summary is not intended to limit the scope of the claims.
In accordance with one aspect, an example method is provided comprising: determining, with a user equipment, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode.
In accordance with another aspect, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining, with the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode.
In accordance with another aspect, an example apparatus is provided comprising: means for determining, with a the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and means for sending, to a network equipment, information regarding the determined uplink transmission power control mode.
In accordance with another aspect, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining, with the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode.
In accordance with another aspect, an example method is provided comprising: determining respective insertion losses for a plurality of antenna ports of a user equipment, where at least two of the respective insertion losses are different; and sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
In accordance with another aspect, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
In accordance with another aspect, an example apparatus is provided comprising: means for determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and means for sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
In accordance with another aspect, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
In accordance with another aspect, an example method is provided comprising: determining, with a network equipment, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the network equipment of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and sending, to the user equipment, the determined information.
In accordance with another aspect, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and sending, to the user equipment, the determined information.
In accordance with another aspect, an example apparatus is provided comprising: means for determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and means for sending, to the user equipment, the determined information.
In accordance with another aspect, an example apparatus is provided comprising: means for determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and means for sending, to the user equipment, the determined information.
In accordance with another aspect, an example apparatus is provided comprising: means for determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and means for sending, to the user equipment, the determined information.
In accordance with another aspect, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and sending, to the user equipment, the determined information.
In accordance with another aspect, an example method comprising: receiving, with a network equipment, a message from a user equipment regarding an uplink transmission power control method; and sending, with the network equipment, a response message to the user equipment regarding the received message.
In accordance with another aspect, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and sending, with the apparatus, a response message to the user equipment regarding the received message.
In accordance with another aspect, an example apparatus is provided comprising: means for receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and means for sending, with the apparatus, a response message to the user equipment regarding the received message.
In accordance with another aspect, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and sending, with the apparatus, a response message to the user equipment regarding the received message.
In accordance with another aspect, an example method is provided comprising: sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and receiving a message from the user equipment indicating that the user equipment supports the established mode.
In accordance with another aspect, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and receiving a message from the user equipment indicating that the user equipment supports the established mode.
In accordance with another aspect, an example apparatus is provided comprising: means for sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and means for receiving a message from the user equipment indicating that the user equipment supports the established mode.
In accordance with another aspect, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and receiving a message from the user equipment indicating that the user equipment supports the established mode.
According to some aspects, there is provided the subject matter of the independent claims. Some further aspects are provided in subject matter of the dependent claims.
The foregoing aspects and other features are explained in the following description, taken in connection with the accompanying drawings, wherein:
The following abbreviations that may be found in the specification and/or the drawing figures are defined as follows:
Features as described herein may be used in regard to enhancing coverage and quality of uplink (UL) sounding reference signal (SRS) based DL CSI acquisition by introducing a new power control scheme. Background may be found, for example, in 3GPP Rel-18 WI of “Further RF requirements enhancement for NR and EN-DC in frequency range 1 (FR1)”, where performance requirements for UE with 8 Rx is one of the objectives.
Turning to
The RAN node 170 in this example is a base station that provides access by wireless devices such as the UE 110 to the wireless network 100. The RAN node 170 may be, for example, a base station for 5G, also called New Radio (NR). In 5G, the RAN node 170 may be a NG-RAN node, which is defined as either a gNB or a ng-eNB. A gNB is a node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to a 5GC (such as, for example, the network element(s) 190). The ng-eNB is a node providing E-UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC. The NG-RAN node may include multiple gNBs, which may also include a central unit (CU) (gNB-CU) 196 and distributed unit(s) (DUs) (gNB-DUs), of which DU 195 is shown. Note that the DU may include or be coupled to and control a radio unit (RU). The gNB-CU is a logical node hosting RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the en-gNB that controls the operation of one or more gNB-DUs. The gNB-CU terminates the F1 interface connected with the gNB-DU. The F1 interface is illustrated as reference 198, although reference 198 also illustrates a link between remote elements of the RAN node 170 and centralized elements of the RAN node 170, such as between the gNB-CU 196 and the gNB-DU 195. The gNB-DU is a logical node hosting RLC, MAC and PHY layers of the gNB or en-gNB, and its operation is partly controlled by gNB-CU. One gNB-CU supports one or multiple cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the F1 interface 198 connected with the gNB-CU. Note that the DU 195 is considered to include the transceiver 160, e.g., as part of a RU, but some examples of this may have the transceiver 160 as part of a separate RU, e.g., under control of and connected to the DU 195. The RAN node 170 may also be an eNB (evolved NodeB) base station, for LTE (long term evolution), or any other suitable base station or node.
The RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/W I/F(s)) 161, and one or more transceivers 160 interconnected through one or more buses 157. Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx, 163. The one or more transceivers 160 are connected to one or more antennas 158. The one or more memories 155 include computer program code 153. The CU 196 may include the processor(s) 152, memories 155, and network interfaces 161. Note that the DU 195 may also contain its own memory/memories and processor(s), and/or other hardware, but these are not shown.
The RAN node 170 includes a module 150, comprising one of or both parts 150-1 and/or 150-2, which may be implemented in a number of ways. The module 150 may be implemented in hardware as module 150-1, such as being implemented as part of the one or more processors 152. The module 150-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the module 150 may be implemented as module 150-2, which is implemented as computer program code 153 and is executed by the one or more processors 152. For instance, the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152, cause the RAN node 170 to perform one or more of the operations as described herein. Note that the functionality of the module 150 may be distributed, such as being distributed between the DU 195 and the CU 196, or be implemented solely in the DU 195.
The one or more network interfaces 161 communicate over a network such as via the links 176 and 131. Two or more gNBs 170 may communicate using, e.g., link 176. The link 176 may be wired or wireless or both and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interface for other standards.
The one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like. For example, the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195 for LTE or a distributed unit (DU) 195 for gNB implementation for 5G, with the other elements of the RAN node 170 possibly being physically in a different location from the RRH/DU, and the one or more buses 157 could be implemented in part as, for example, fiber optic cable or other suitable network connection to connect the other elements (e.g., a central unit (CU), gNB-CU) of the RAN node 170 to the RRH/DU 195. Reference 198 also indicates those suitable network link(s).
It is noted that description herein indicates that “cells” perform functions, but it should be clear that equipment which forms the cell will perform the functions. The cell makes up part of a base station. That is, there can be multiple cells per base station. For example, there could be three cells for a single carrier frequency and associated bandwidth, each cell covering one-third of a 360 degree area so that the single base station's coverage area covers an approximate oval or circle. Furthermore, each cell can correspond to a single carrier and a base station may use multiple carriers. So if there are three 120 degree cells per carrier and two carriers, then the base station has a total of 6 cells.
The wireless network 100 may include a network element or elements 190 that may include core network functionality, and which provides connectivity via a link or links 181 with a further network, such as a telephone network and/or a data communications network (e.g., the Internet). Such core network functionality for 5G may include access and mobility management function(s) (AMF(S)) and/or user plane functions (UPF(s)) and/or session management function(s) (SMF(s)). Such core network functionality for LTE may include MME (Mobility Management Entity)/SGW (Serving Gateway) functionality. These are merely exemplary functions that may be supported by the network element(s) 190, and note that both 5G and LTE functions might be supported. The RAN node 170 is coupled via a link 131 to a network element 190. The link 131 may be implemented as, e.g., an NG interface for 5G, or an SI interface for LTE, or other suitable interface for other standards. The network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/W I/F(s)) 180, interconnected through one or more buses 185. The one or more memories 171 include computer program code 173. The one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the network element 190 to perform one or more operations.
The wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network. Network virtualization involves platform virtualization, often combined with resource virtualization. Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171, and also such virtualized entities create technical effects.
The computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 125, 155, and 171 may be means for performing storage functions. The processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 110, RAN node 170, and other functions as described herein.
In general, the various embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
3GPP Rel-15 RAN4 specification (TS 38.101-1) introduced performance requirements related to UL SRS resource configuration with antenna switching, where UEs equipped with 4 RX antenna ports were assumed, and depending on reported UE's antenna-switching capability, the UE can be configured with one of the following antenna-switching configurations: t1r2, t1r4, t2r4, t1r4-t2r4, t1r1, t2r2 and t4r4′, where “t” and “r” define the number of transmission antenna ports and reception antenna ports at the UE-side, respectively. It's noted that t “x” r “y” is denoted as xTyR in RAN1 language.
RAN4 has identified an issue specifically for configurations whose “t” is less than “r”. The issue is that UEs cannot achieve an advertised maximum output power, i.e., power class (PC) from each antenna port due to routing loss in RF front end apart from the main antenna. (R4-1810553). As a result, TS 38.101-1 allows the UE to transmit output power relaxed by ΔTRxSRS, e.g., 4.5 dB for n79 when the UE is capable of power class 3. It means that the respective output powers from other than main antenna port can be less than half of the output power from the main antenna port.
Further, in Rel-18, RAN4 has started introducing performance requirements for 8 Rx, where corresponding ΔTRxSRS values have been discussed, while the proposed values are in some cases, e.g., 8 dB (R4-2301763) due to more complicated UE implementation with more switches, more routing loss specifically for CPE devices.
An example of ΔTRxSRS values (“Delta”) can be seen in e.g., Table 9 in R4-2216347. Table 9 from R4-2216347 is shown in FIG. 3B, along with a diagram from 2.2.6 of R4-2216347 showing the antenna ports (Ant1, Ant2, etc.) shown in
If the UE does not maintain the power imbalances, i.e., try to compensate for the ΔTRxSRS (mode 0) and if gNB uses ΔTRxSRS as error correction factor, the estimated channel may bring even larger errors, while if the UE keep the power imbalance (i.e., mode 1) and if gNB doesn't use ΔTRxSRS as error correction factor, the estimated channel may bring even larger errors as well. Furthermore, when PA output power approaches to close to the achievable maximum power, even Mode 0 may not be able to be realized anymore. Hence, in this case, gNB should apply ΔTRxSRS to error correction process or the UE needs to report configured transmitted power up to the power where the UE can maintain Mode 0, e.g., 20 dBm if ΔTRxSRS for the 2nd SRS transmission is 3 dB for PC3 with t1r2 configuration. Overall, the importance is to enable gNB to correctly know what the UE can do under which condition as well as control the modes properly depending on the condition.
Features as described herein may be used to minimize channel estimation error, not only at a cell edge, but anywhere in the cell. Furthermore, features may also be used to avoid ambiguity between the UE and the gNB regarding to applied UL TX power control method.
There are currently different options to estimate channel with less estimation errors due to ΔTRxSRS. Two modes are provided in order to assist gNB to estimate channel more accurately; Mode 0 and Mode 1.
Both modes are not always perfect, and the most suitable Mode depends on some other conditions. Hence, depending on the conditions, NW and/or UE need to switch a Mode to the other. Based on following parts of TS 38.213 and TS 38.331 specifications, it seems that the current specifications only allow network to expect UE to conduct mode 0.
Granularity of power control parameters is defined per SRS resource set.
Hence, the UE is allowed to configure transmitted power with consideration of ΔTRxSRS per slot per UE basis, while it is not mandatory for the UE to use exactly the defined ΔTRxSRS, i.e., it is not problem for the UE to use some of ΔTRxSRS or not to use ΔTRxSRS at all if it wants. Hence, it is not clear exact UE behaviors even in higher power range. The UE may use mode 0 or 1. Even if the UE uses one of the modes, it is not clear if the UE uses a part of ΔTRxSRS, e.g., 1 dB out of 3 dB or 3 dB out of 3 dB. In order to obtain the whole picture, expected UE behaviors depending on target powers and modes are shown in
For case 2 of Mode 0, a UE may need to turn on the second (2nd) PA to deliver 21 dBm at PA and 15 dBm at port 0. The power at antenna port is maintained, but the power at PA needs to be increased by 3 dB. Thus, this situation corresponds to relative power requirement in TS 38.101-1, where ΔP=3 dB allows ±4.5 tolerance if we refer to TS38.101-1. The requirement allows UE to have 20 ms to the power setting, while SRS antenna switching gives the UE just one or two symbol to settle down the power at the target value. Hence, it is expected that not all the UEs are able to accurately achieve 21 dBm immediately after the GP (Guard Period) despite the 38.213/38.331 expectation.
Referring also to
For case 3 of Mode 0, as mentioned above, the UE is required to increase PA output up to 29 dBm to achieve 23 dBm at port 1. It may not be possible for all of the UEs to perform it. This situation can be generalized in a way that in practice, it is not possible for a UE to perform mode 0 in case the required output power is larger than PC-Max ({actual ΔTRxSRS,p|, p=0, 1, . . . n})=PC−Max(ΔTRxSRS,0, ΔTRxSRS,1, . . . , ΔTRxSRS,n), where p corresponds to port number. Hence, from the UE perspective, if a UE can perform Mode 0 and/or 1 and its applicable conditions should be clearly defined. From network perspective, the network should be able to obtain the UE's capability and its applicable conditions and authority to switch the modes depending on the conditions.
Regarding uplink SRS power control, TS 38.213 defines the UE behavior for the UL SRS power control as follows:
if the UE is not configured for PUSCH transmissions on active UL BWP b of carrier f of serving cell C, or if srs-PowerControlAdjustmentStates indicates separate power control adjustment states between SRS transmissions and PUSCH transmissions, and if tpc-Accumulation is not provided,
Some features as described herein may be used from the UE perspective. Likewise, other features as described herein may be used from the NW perspective.
From the UE perspective, an example may comprise defining at least two (2) power control modes comprising:
It should be noted that ΔTRxSRS,p and ΔTRxSRS are both mentioned in the above description. ΔTRxSRS is maximum allowed performance degradation. ΔTRxSRS,p, on the other hand, is the insertion loss at the respective antenna connectors/ports.
In one example, the insertion loss (or routing loss) for one or more of the respective antenna ports (the per port insertion loss) may be reported by the UE to the network only once. This would be the case in most situations. In most cases, it may be expected that that the reported insertion loss per port will not change. So, whenever the UE is configured with mode 1, the UE would typically not need to repeatedly report the per port insertion loss, and the per port insertion loss would merely be reported once. This means that once the UE signaled the values of the per port insertion loss during initial access as UE capability parameters, the UE would typically not need to report the per port insertion loss to the network again. It should also be noted that, in another example, the insertion loss for each of the respective antenna ports (the per port insertion loss) may be reported by the UE to the network more than once such as, for example, if there is a change where it might be desired to be reported to the network at a later time after the first initial reporting.
The insertion loss at each of the respective antenna connectors/ports may be determined in any suitable manner. For example, the insertion loss may be predetermined or may be measured or may be estimated or expected based upon one or more predetermined factors and/or one or more non-predetermined factors. For example, one or more values may be preinstalled in the UE with a predetermination into a program or algorithm, and perhaps supplemented with one or more additional factors. For example, a UE manufacturer may have specific insertion loss values, per antenna port, stored into memory when the UE is manufactured. The insertion loss values may be fixed. The insertion loss values would be different for different models of UEs in most cases. In one type of example embodiment, the program/software may be adapted to modify the insertion loss values stored in the memory based upon one or more factors such as, for example, if the UE regularly and autonomously measures the loss (or a portion of the loss or factor(s) affecting loss) by themselves. For example, temperature may change the insertion loss and, thus, temperature may be used to help determine the insertion loss per antenna port. Also, as mentioned above, switching and circuit path distance may change the insertion loss and, thus, switching and/or circuit path distance may change the insertion loss per antenna port. It should be noted that these are merely examples of some factors which may be used to determine the insertion loss, but are not limiting. More or less factors may be used to determine the insertion loss. In some example embodiments the insertion loss might be referred to as an actual insertion loss, or an expected insertion loss, or an estimated insertion loss, or an approximated insertion loss. However, these are merely names and should not be considered as limiting. The different respective “values” of the insertion losses, per antenna port, being reported to the network may be used as a feature; regardless of how those values are obtained. In one example, the actual insertion loss may be “zero” (0 dB) (or set at “zero”) for port 0, and the actual insertion loss for the other ports may be set relative to that Port 0. The estimated insertion losses, per antenna port, may be determined as noted above and reported to the network. For example, with reference to the table below, with an insertion loss for port 1 of 3 dB, the UE may report ΔTRxSRS,p to the NW; ΔTRxSRS,1=3 dB in this example.
Additionally, or alternatively, an example may comprise introducing a new per antenna port power control concept where a new parameter ΔTRxSRS, p is introduced into the power control formula in order for the UE to adjust the powers depending on the previously reported parameters. This may be introduced into TS 38.213 for example. With the example using the two defined power control modes
If a UE transmits a sounding reference signal (SRS) based on a configuration by SRS-ResourceSet on active UL BWP b of carrier f of serving cell c using SRS power control adjustment state with index l, the UE may determine the SRS transmission power PSRS(i, qs, l, p) per antenna port, p, in SRS transmission occasion i as:
where,
From the network (NW) perspective, an example may comprise introduction of one or more schemes for the network to request and/or configure the UE to switch modes; supported by the UE depending conditions such as channel for example. In addition, the network may be allowed to configure the UE with one or more event triggering conditions that:
With features as described herein, a system may be introduced for the network to request and/or configure the UE to enable one of the power control modes; depending on power modes supported by the UE. In addition, the network may be allowed to configure the UE with event triggering conditions.
In one embodiment, to enable switching between different UL power control methods (mode 0 or mode 1 for example) for UL SRS resource set with usage antenna-switching, a new higher layer UL SRS resource set specific parameter, pc-method-antenna-switching, may be defined.
Please note that “pc-method-antenna-switching” is merely a name given to the parameter in this description. In an alternate example, another different name for the parameter might be used. In an example embodiment, when the UL SRS resource set with usage antenna-switching is configured with pc-method-antenna-switching=mode 0, the network may consider the power per port within a SRS resource set the same across the ports, and do not take into account ΔTRxSRS,p (p=0, 1, . . . n) for channel estimation correction.
In an example embodiment, when the UL SRS resource set with usage antenna-switching is configured with pc-method-antenna-switching=mode 1, the network may consider that the UE may maintain power imbalance across ports depending on the reported actual ΔTRxSRS, p, and take the reported actual ΔTRxSRS, p into account for channel estimation correction.
In an example embodiment, a UE autonomous UL TX power control method switching, for UL SRS with usage antenna-switching, may be defined.
In one example, the UE autonomous mode selection may be configured to be used in conjunction with existing power control mode or independent from them.
In one example, the UE may be configured with multiple UL SRS with antenna-switching specific UL power control triggering conditions. Example embodiments may include, merely for example:
When the UE has autonomously selected one of the UL power control modes for UL SRS antenna switching:
When the UE has autonomously selected one of the UL power control modes for UL SRS antenna switching, the UE may send out the completion message that the UE has enabled one of the power control modes depending on the threshold to the gNB, such as, for example, via a MAC CE. The completion message may comprise at least one of the power control mode (0 or 1). Otherwise, the UE may apply legacy power control method or maintain the current mode.
With features as described herein, a non-autonomous type of UE operation may be provided. With features as described herein, an autonomous type of UE operation may be provided. For example, with the autonomous type of UE operation the gNB may send information to the UE with multiple UL SRS with antenna-switching specific UL power control triggering conditions.
UE capability, including which mode(s) that a UE supports, is signaled during initial access. When UE capability is mentioned, it is normally static but, of course, may change. Configurations become possible only after the gNB receives the UE capability. In most cases, the UE would not supply additional report(s) regarding the mode or the loss per port after the UE is configured. An example may comprise at least one of:
The gNB may use the reported per port loss to compensate for the lost power when the UE is during mode 1. On the other hand, the gNB does not need to use the reported per port loss when the UE is during mode 0. For mode 0, the insertion losses are not material for the gNB (because the power at the antenna ports is the same and, thus, the network does not need to compensate for a power imbalance), and the per port insertion losses need not be reported to the gNB in regard to mode 0. With mode 1, on the other hand, the UE has power imbalances across the ports, and the UE is able to report those imbalances (per port insertion losses) to the gNB at initial access to help prevent an over-estimate by the gNB regarding a channel.
For the UE autonomous selection case, where the UE can select between mode 0 and mode 1, the UE may report the selected mode to the gNB. However, since the loss per port was previously reported as UE capability at initial access, there normally is no need for the UE to report the values to the gNB again. The gNB may, if mode 0 has been selected, configure to communicate with the UE in view of that selection. The gNB may, if mode 1 has been selected, configure to communicate with the UE in view of that selection. For use with a mode 1 selection, the gNB may send the UE one or more event triggering information. Of course, reselections with the UE and gNB may occur subsequently.
In one example embodiment, an example method may be provided comprising: determining, with a user equipment, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode. The determining may comprises receiving a message by the UE from the network to configure the UE for a first mode. The determining may comprise receiving a message by the UE from the network to configure the UE for a different second mode. The determining may comprise receiving a message by the UE from the network to configure the UE for use of both the first mode and the second mode such as, for example, using the modes alternatively with the UE selecting the mode. The determining may comprise determining an uplink transmission power control mode by the user equipment at initial access. The sending of the information to the network from the UE may comprise sending a message to the network that the UE supports mode 0 at initial access. The determining may comprise determining an uplink transmission power control mode by the user equipment at initial access. The sending of the information to the network from the UE may comprise sending a message to the network that the UE supports mode 1 at initial access. The sending of the information to the network from the UE may comprise sending a message to the network that the UE supports mode 0 and mode 1. The sending of the information to the network from the UE may comprise sending a report to the network with the per port insertion loss information. The sending of the information to the network from the UE may comprise sending the network a message indicating which mode, from a plurality of modes, the UE has selected. These are merely some examples of the information which may be sent to the network and should not be considered as limiting. In addition the “sending” may comprises multiple messages at different times. The method may comprise determining an insertion loss for the respective at least two antenna ports, and reporting the determined insertion losses for the respective antenna ports to the network.
The at least two different transmission power control modes may comprise: a first mode where the user equipment provides a substantially same uplink transmission output power for the at least two of the antenna ports; and a second mode where the user equipment provides uplink transmission output powers for the at least two antenna ports which are not substantially the same for the respective at least two antenna ports. In the first mode, the providing of the uplink transmission output power for the ports may comprise maintaining the uplink transmission output power, at each respective port, at a substantially same power. In the second mode, the providing of the uplink transmission output powers for the ports may comprise maintaining the uplink transmission output power, at each respective port, as different from one another. In the second mode, the uplink transmission output powers for the ports may be maintained by the UE according to the report previously sent to the network for the insertion losses. So, for example, if the report of the insertion losses to the network for port 0 is zero (0) and port 1 is 3 dB with mode 1, then the UE may be configured to maintain (or at least approximately maintain) that difference of 3 dB between the two port over time.
Referring also to
The method may further comprise determining an insertion loss for the respective at least two antenna ports. The at least two different transmission power control modes may comprise: a first mode where the user equipment provides a substantially same uplink transmission output power for the at least two of the antenna ports; and a second mode where the user equipment provides uplink transmission output powers for the at least two antenna ports which are not substantially the same for the respective at least two antenna ports. The second mode may comprise determining an uplink transmission output power performance degradation for the at least two antenna ports. The sending of the information may comprise sending a report in regard to the second mode to the network equipment, where the report comprises information regarding the insertion losses for the respective at least two antenna ports. The information regarding the insertion losses may comprise information relative to a reference output power. The reference output power may comprise the insertion loss, for a first one of the antenna ports, which is less than the insertion loss for a second one of the antenna ports. The sending of the information may comprise an indication that the user equipment is configured to support use of the first mode. The sending of the information may comprise an indication that the user equipment is configured to support use of the second mode. The method may further comprise the user equipment selecting one of the at least two possible different uplink transmission power control modes for use with the antenna ports. The sending of the information may comprise an indication of the selected uplink transmission power control mode. The method may further comprise receiving mode information from the network equipment. The received mode information may comprise information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the network equipment of a recommended power control mode, or select one of the at least two possible different uplink transmission power control modes for use with the antenna ports. The received mode information may be configured to enable the user equipment to inform the network equipment of a recommended power control mode, and the method may further comprise receiving a message from the network equipment configured for the user equipment to reconfigure to use the recommended power control mode. The method may further comprise the user equipment sending a message to the network equipment that the user equipment has reconfigured to use the recommended power control mode. The received mode information may be configured to enable the user equipment to select one of the at least two possible different uplink transmission power control modes for use with the antenna ports, and the method may further comprise the user equipment sending a message to the network equipment that the user equipment has reconfigured to use the selected transmission power control mode. The method may further comprise receiving, with the user equipment, multiple uplink power control triggering conditions for use with antenna-switching. The method may further comprise using the multiple uplink power control triggering conditions to select one of the at least two possible different uplink transmission power control modes. The method may further comprise receiving, with the user equipment, receiving an uplink sounding resource signal (SRS) resource set parameter, and using the parameter to configure the user equipment to use one of the at least two possible different uplink transmission power control modes. The method may further comprise receiving a message, with the user equipment, with a change of the parameter, and using the changed parameter to reconfigure the user equipment to use a different one of the at least two possible different uplink transmission power control modes.
In accordance with one example embodiment, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining, with the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode.
The instructions, when executed with the at least one processor, may cause the apparatus to perform determining an insertion loss for the respective at least two antenna ports. The at least two different transmission power control modes may comprise: a first mode where the user equipment provides a substantially same uplink transmission output power for the at least two of the antenna ports; and a second mode where the user equipment provides uplink transmission output powers for the at least two antenna ports which are not substantially the same for the respective at least two antenna ports. The second mode may comprise determining an uplink transmission output power performance degradation for the at least two antenna ports. The sending of the information may comprise sending a report in regard to the second mode to the network equipment, where the report comprises information regarding the insertion losses for the respective at least two antenna ports. The information regarding the insertion losses may comprise information relative to a reference output power. The reference output power may comprise the insertion loss, for a first one of the antenna ports, which is less than the insertion loss for a second one of the antenna ports. The sending of the information may comprise an indication that the user equipment is configured to support use of the first mode. The sending of the information may comprise an indication that the user equipment is configured to support use of the second mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform selecting one of the at least two possible different uplink transmission power control modes for use with the antenna ports. The sending of the information may comprise an indication of the selected uplink transmission power control mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving mode information from the network equipment. The received mode information may comprise information regarding at least one event triggering condition to enable the apparatus to, at least one of: inform the network equipment of a recommended power control mode, or select one of the at least two possible different uplink transmission power control modes for use with the antenna ports. The received mode information may be configured to enable the apparatus to inform the network equipment of a recommended power control mode, and where the instructions, when executed with the at least one processor, may cause the apparatus to perform receiving a message from the network equipment configured for the apparatus to reconfigure to use the recommended power control mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform sending a message to the network equipment that the apparatus has reconfigured to use the recommended power control mode. The received mode information may be configured to enable the apparatus to select one of the at least two possible different uplink transmission power control modes for use with the antenna ports, and where the instructions, when executed with the at least one processor, may cause the apparatus to perform sending a message to the network equipment that the apparatus has reconfigured to use the selected transmission power control mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving, with the apparatus, multiple uplink power control triggering conditions for use with antenna-switching. The instructions, when executed with the at least one processor, may cause the apparatus to perform using the multiple uplink power control triggering conditions to select one of the at least two possible different uplink transmission power control modes. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving, with the apparatus, an uplink sounding resource signal (SRS) resource set parameter, and using the parameter to configure the user equipment to use one of the at least two possible different uplink transmission power control modes. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving a message, with the apparatus, with a change of the parameter, and using the changed parameter to reconfigure the apparatus to use a different one of the at least two possible different uplink transmission power control modes.
In accordance with one example embodiment, an example apparatus may be provided comprising: means for determining, with a the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and means for sending, to a network equipment, information regarding the determined uplink transmission power control mode.
In accordance with one example embodiment, an example apparatus may be provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining, with the apparatus, an uplink transmission power control mode from at least two possible different uplink transmission power control modes for antenna ports of the apparatus, where the antenna ports comprise at least two antenna ports; and sending, to a network equipment, information regarding the determined uplink transmission power control mode.
Referring also to
The sending of the information may comprise sending a report to the network equipment comprising the determined respective insertion losses. The determining of the respective insertion losses may comprise use of a reference output power. The user equipment may be adapted to use one of at least two uplink transmission power control modes, where the least two uplink transmission power control modes comprise: a first mode where the user equipment is configured to provide a substantially same uplink transmission output power for the antenna ports; and a second mode where the user equipment is configured to provide uplink transmission output powers for the antenna ports which are not substantially the same for the respective antenna ports, where the method further comprises receiving from the network equipment information to use the second mode. The method may further comprise sending a message to the network equipment recommending the second mode. The user equipment may be adapted to use one of at least two uplink transmission power control modes, where the least two uplink transmission power control modes comprise: a first mode where the user equipment is configured to provide a substantially same uplink transmission output power for the antenna ports; and a second mode where the user equipment is configured to provide uplink transmission output powers for the antenna ports which are not substantially the same for the respective antenna ports, where the method further comprises the user equipment selecting one of the modes. The method may further comprise sending a message to the network equipment indicating that the user equipment has selected the second mode. The method may further comprise receiving, from the network equipment, information configured for the user equipment to use to configure an uplink transmission power control mode from as one of at least two uplink transmission power control modes. The method may further comprise receiving, from the network equipment, multiple uplink power control triggering conditions for use with mode switching. The method may further comprise using at least one of the multiple uplink power control triggering conditions to select an uplink transmission power control mode. The method may further comprise receiving, from the network equipment, an uplink sounding resource signal (SRS) resource set parameter, and using the parameter to configure the user equipment to use one of the at least two possible different uplink transmission power control modes. The method may further comprise receiving a message, with the user equipment, with a change of the parameter, and using the changed parameter to reconfigure the user equipment to use a different one of the at least two possible different uplink transmission power control modes.
In accordance with one example embodiment, an example apparatus may be provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
The sending of the information may comprise sending a report to the network equipment comprising the determined respective insertion losses. The determining of the respective insertion losses may comprise use of a reference output power. The apparatus may be adapted to use one of at least two uplink transmission power control modes, where the least two uplink transmission power control modes comprise: a first mode where the user equipment is configured to provide a substantially same uplink transmission output power for the antenna ports; and a second mode where the user equipment is configured to provide uplink transmission output powers for the antenna ports which are not substantially the same for the respective antenna ports, where the instructions, when executed with the at least one processor, cause the apparatus to perform receiving from the network equipment information to use the second mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform sending a message to the network equipment recommending the second mode. The apparatus may be adapted to use one of at least two uplink transmission power control modes, where the least two uplink transmission power control modes comprise: a first mode where the apparatus is configured to provide a substantially same uplink transmission output power for the antenna ports; and a second mode where the apparatus is configured to provide uplink transmission output powers for the antenna ports which are not substantially the same for the respective antenna ports, where the instructions, when executed with the at least one processor, cause the apparatus to perform selecting one of the modes. The instructions, when executed with the at least one processor, may cause the apparatus to perform sending a message to the network equipment indicating that the apparatus has selected the second mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving, from the network equipment, information configured for the apparatus to use to configure an uplink transmission power control mode from as one of at least two uplink transmission power control modes. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving, from the network equipment, multiple uplink power control triggering conditions for use with mode switching. The instructions, when executed with the at least one processor, may cause the apparatus to perform using at least one of the multiple uplink power control triggering conditions to select an uplink transmission power control mode. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving, from the network equipment, an uplink sounding resource signal (SRS) resource set parameter, and using the parameter to configure the apparatus to use one of the at least two possible different uplink transmission power control modes. The instructions, when executed with the at least one processor, may cause the apparatus to perform receiving a message, with the user equipment, with a change of the parameter, and using the changed parameter to reconfigure the apparatus to use a different one of the at least two possible different uplink transmission power control modes.
In accordance with one example embodiment, an example apparatus may be provided comprising: means for determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and means for sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
In accordance with one example embodiment, an example apparatus may be provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining respective insertion losses for a plurality of antenna ports of the apparatus, where at least two of the respective insertion losses are different; and sending, to a network equipment, information regarding the determined respective insertion losses for the plurality of antenna ports.
Referring also to
The determined information may be configured to enable the user equipment to inform the network equipment of a recommended power control mode, and the method further comprises sending a message from the network equipment for the user equipment to use the recommended power control mode. The method may further comprise receiving a message from the user equipment indicating that the user equipment has reconfigured to use the recommended power control mode. The determined information may be configured to enable the user equipment to select one of the at least two different transmission power control modes for use with the antenna ports, and the method may further comprise receiving a message from the user equipment indicating that the user equipment has reconfigured to use the selected transmission power control mode. The information may comprise an uplink sounding resource signal (SRS) resource set parameter. The parameter may be configured to be used to by the user equipment to use at least one of the at least two different uplink transmission power control modes. The parameter may be configured to at least partially indicate a UL power control method for UL SRS antenna switching included as part of TCI-state information. The parameter may be sent with a MAC CE or physical layer signaling. The determined information may comprise information regarding the at least two different uplink transmission power control modes. The at least two different uplink transmission power control modes may comprise: a first mode where the user equipment provides a substantially same uplink transmission output power for the at least two antenna ports; and a second mode where the user equipment provides uplink transmission output powers for the at least two antenna ports which are not substantially the same for the respective at least two antenna ports.
In accordance with one example embodiment, an example apparatus may be provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and sending, to the user equipment, the determined information.
In accordance with one example embodiment, an example apparatus may be provided comprising: means for determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and means for sending, to the user equipment, the determined information.
In accordance with one example embodiment, an example apparatus may be provided comprising a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: determining, with the apparatus, information for a user equipment to use in regard to an uplink transmission power control mode for antenna ports of the user equipment, where the antenna ports comprise at least two antenna ports, and where the information comprises information regarding at least one event triggering condition to enable the user equipment to, at least one of: inform the apparatus of a recommended power control mode, or select one of at least two different uplink transmission power control modes for use with the antenna ports; and sending, to the user equipment, the determined information.
Referring also to
In accordance with one example embodiment, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and sending, with the apparatus, a response message to the user equipment regarding the received message.
In accordance with one example embodiment, an example apparatus is provided comprising: means for receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and means for sending, with the apparatus, a response message to the user equipment regarding the received message.
In accordance with one example embodiment, an example apparatus is provided with a non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: receiving, with the apparatus, a message from a user equipment regarding an uplink transmission power control method; and sending, with the apparatus, a response message to the user equipment regarding the received message.
Referring also to
In accordance with one example embodiment, an example apparatus is provided comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and receiving a message from the user equipment indicating that the user equipment supports the established mode.
In accordance with one example embodiment, an example apparatus is provided comprising: means for sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and means for receiving a message from the user equipment indicating that the user equipment supports the established mode.
In accordance with one example embodiment, a non-transitory program storage device readable by an apparatus is provided, tangibly embodying a program of instructions executable with the apparatus for performing operations, the operations comprising: sending a message to a user equipment, where the message is configured to be used with the user equipment to establish an uplink transmission power control mode for at least two antenna ports of the user equipment comprising one of: a first mode, or a different second mode, or a third mode available with the user equipment to use one of either the first mode or the second mode; and receiving a message from the user equipment indicating that the user equipment supports the established mode.
The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM).
As used in this application, the term “circuitry” may refer to one or more or all of the following:
This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
It should be understood that the foregoing description is only illustrative. Various alternatives and modifications can be devised by those skilled in the art. For example, features recited in the various dependent claims could be combined with each other in any suitable combination(s). In addition, features from different embodiments described above could be selectively combined into a new embodiment. Accordingly, the description is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended claims.
This application claims priority to U.S. provisional Application No. 63/459,869 filed Apr. 17, 2023, which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63459869 | Apr 2023 | US |
