Method and apparatus related to wireless communication

Abstract

Methods and apparatus related to wireless communications. The present specification describes a terminal device comprising: means for performing a simultaneous uplink transmission using a first transmission configuration indicator (TCI) state and a second TCI state; means for determining whether a transmit power imbalance between the first TCI state and the second TCI state exceeds a transmit power imbalance threshold; and means for deactivating one of the first TCI state and the second TCI state if the transmit power imbalance threshold is exceeded.

Description

Technical Field

[0001] This manual generally relates to wireless communication. Background Technology

[0002] Terminal equipment (sometimes called 'user equipment' (UE)) can communicate wirelessly with the network's radio access nodes (e.g., base stations). This communication can facilitate a variety of tasks. Summary of the Invention

[0003] In a first aspect, this specification describes a terminal device comprising: components for performing simultaneous uplink transmission using a first Transmission Configuration Indicator (TCI) state and a second TCI state; components for determining whether a transmission power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold; and components for deactivating one of the first and second TCI states if the transmission power imbalance threshold is exceeded. In some examples, the terminal device further includes components for receiving configuration information indicating the transmission power imbalance threshold from a network node. Additionally or alternatively, the transmission power imbalance threshold may be pre-configured at the terminal device.

[0004] In some examples, the terminal device further includes components for determining a first required transmit power reduction value for a first TCI state and a second required transmit power reduction value for a second TCI state to conform to a maximum total radiated power value or a maximum effective isotropic radiated power value. In some such examples, a transmit power imbalance between the first TCI state and the second TCI state can be determined to exceed the transmit power imbalance threshold when the first transmit power value for the first TCI state resulting from applying the first required transmit power reduction value differs from the second transmit power value for the second TCI state resulting from applying the second required transmit power reduction value by at least a transmit power imbalance threshold.

[0005] In some examples, the terminal device further includes a component for sending an indication to a network node that the transmit power imbalance threshold has been exceeded. In some such examples, the network node's receipt of the indication causes at least one network resource associated with an uplink transmission performed using a deactivated TCI state from a first TCI state and a second TCI state to be released. In some examples, when the transmit power imbalance threshold is exceeded, one of the first and second TCI states is deactivated based on a quality metric associated with the first and second TCI states.

[0006] In some examples, the terminal device further includes: a component for receiving information from a network node indicating which TCI state, either a first TCI state or a second TCI state, will be deactivated if a transmit power imbalance threshold is exceeded. Additionally or alternatively, the terminal device further includes: a component for continuing to perform simultaneous uplink transmissions using both the first and second TCI states if the transmit power imbalance threshold is not exceeded. Additionally or alternatively, uplink transmissions performed using the first TCI state are associated with a first network node, and uplink transmissions performed using the second TCI state are associated with a second network node.

[0007] In a second aspect, this specification describes a network node comprising: means for sending configuration information to a terminal device indicating a transmission power imbalance threshold for determining whether to deactivate one of a first Transmission Configuration Indicator (TCI) state and a second TCI state used by the terminal device for simultaneous uplink transmission. In some examples, the network node further comprises: means for receiving from the terminal device an indication that the power imbalance between the first TCI state and the second TCI state exceeds the transmission power imbalance threshold. In some such examples, the network node further comprises: means for releasing at least one network resource in response to an indication, the at least one network resource being associated with uplink transmission performed using the deactivated TCI state in the first TCI state and the second TCI state.

[0008] In a third aspect, this specification describes a network node including components for receiving an indication from a terminal device performing simultaneous uplink transmission using a first Transmission Configuration Indicator (TCI) state and a second TCI state that a power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold.

[0009] In a fourth aspect, this specification describes an apparatus (e.g., a terminal device) comprising at least one processor and at least one memory storing instructions, which, when executed by the at least one processor, cause the apparatus to at least: perform simultaneous uplink transmission using a first Transmission Configuration Indicator (TCI) state and a second TCI state; determine whether a transmission power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold; and, if the transmission power imbalance threshold is exceeded, deactivate one of the first TCI state and the second TCI state. In some examples, the instructions stored in at least one memory of the apparatus of the fourth aspect, when executed by the at least one processor, cause the apparatus to at least: receive configuration information indicating a transmission power imbalance threshold from a network node. Additionally or alternatively, the transmission power imbalance threshold may be pre-configured at the terminal device.

[0010] In some examples, instructions stored in at least one memory of the means of the fourth aspect, when executed by at least one processor, can cause the means to at least: determine a first desired transmit power reduction value for a first TCI state and a second desired transmit power reduction value for a second TCI state to conform to a maximum total radiated power value or a maximum effective isotropic radiated power value. In some such examples, a transmit power imbalance between the first TCI state and the second TCI state can be determined to exceed the transmit power imbalance threshold when the first transmit power value for the first TCI state resulting from applying the first desired transmit power reduction value differs from the second transmit power value for the second TCI state resulting from applying the second desired transmit power reduction value by at least a transmit power imbalance threshold.

[0011] In some examples, instructions stored in at least one memory of the means of the fourth aspect, when executed by at least one processor, can cause the means to at least perform the following: send an indication to a network node that the transmit power imbalance threshold has been exceeded. In some such examples, the network node's receipt of the indication causes at least one network resource associated with an uplink transmission performed using a deactivated TCI state from the first TCI state and the second TCI state to be released. In some examples, in the event that the transmit power imbalance threshold has been exceeded, one of the first and second TCI states is deactivated based on a quality metric associated with the first and second TCI states.

[0012] In some examples, instructions stored in at least one memory of the means of the fourth aspect, when executed by at least one processor, can cause the means to at least perform the following: receive information from a network node indicating which TCI state, either the first or second TCI state, will be deactivated if a transmit power imbalance threshold is exceeded. Additionally or alternatively, instructions stored in at least one memory of the means of the fourth aspect, when executed by at least one processor, can cause the means to at least perform the following: continue using both the first and second TCI states to perform simultaneous uplink transmissions if the transmit power imbalance threshold is not exceeded. Additionally or alternatively, uplink transmissions performed using the first TCI state are associated with a first network node, and uplink transmissions performed using the second TCI state are associated with a second network node.

[0013] In a fifth aspect, this specification describes an apparatus (e.g., a network node) comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: send configuration information to an end device indicating a transmission power imbalance threshold for determining whether to deactivate one of a first Transmission Configuration Indicator (TCI) state and a second TCI state used by the end device for simultaneous uplink transmission. In some examples, instructions stored in at least one memory of the apparatus of the fifth aspect, when executed by the at least one processor, cause the apparatus to at least: receive from the end device an indication that the power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold. In some such examples, instructions stored in at least one memory of the apparatus of the fifth aspect, when executed by the at least one processor, cause the apparatus to at least: release at least one network resource in response to an indication, the at least one network resource being associated with uplink transmissions performed using a deactivated TCI state in the first TCI state and the second TCI state.

[0014] In a sixth aspect, this specification describes an apparatus (e.g., a network node) comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least perform: receiving an indication from a terminal device performing simultaneous uplink transmissions using a first Transmission Configuration Indicator (TCI) state and a second TCI state that a power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold.

[0015] In a seventh aspect, this specification describes a method comprising: performing simultaneous uplink transmission using a first Transmission Configuration Indicator (TCI) state and a second TCI state; determining whether a transmit power imbalance between the first TCI state and the second TCI state exceeds a transmit power imbalance threshold; and, if the transmit power imbalance threshold is exceeded, deactivating one of the first TCI state and the second TCI state.

[0016] In some examples, the method further includes receiving configuration information from a network node indicating a transmit power imbalance threshold. Alternatively or additionally, the transmit power imbalance threshold may be pre-configured at the end device.

[0017] In some examples, the method further includes determining a first required transmit power reduction value for a first TCI state and a second required transmit power reduction value for a second TCI state to conform to a maximum total radiated power value or a maximum effective isotropic radiated power value. In some such examples, a transmit power imbalance between the first TCI state and the second TCI state can be determined to exceed the transmit power imbalance threshold when the first transmit power value for the first TCI state resulting from applying the first required transmit power reduction value differs from the second transmit power value for the second TCI state resulting from applying the second required transmit power reduction value by at least a transmit power imbalance threshold.

[0018] In some examples, the method further includes sending an indication to the network node that the transmit power imbalance threshold has been exceeded. In some such examples, the network node's receipt of the indication causes at least one network resource associated with an uplink transmission performed using a deactivated TCI state from a first TCI state and a second TCI state to be released. In some examples, when the transmit power imbalance threshold is exceeded, one of the first and second TCI states is deactivated based on a quality metric associated with the first and second TCI states.

[0019] In some examples, the method further includes receiving information from a network node indicating which of the first and second TCI states to deactivate if a transmit power imbalance threshold is exceeded. Additionally or alternatively, the method further includes continuing to perform simultaneous uplink transmissions using both the first and second TCI states if the transmit power imbalance threshold is not exceeded. Additionally or alternatively, the uplink transmission performed using the first TCI state is associated with a first network node, and the uplink transmission performed using the second TCI state is associated with a second network node.

[0020] In an eighth aspect, this specification describes a method comprising: sending configuration information to a terminal device indicating a transmit power imbalance threshold for determining whether to deactivate one of a first Transmission Configuration Indicator (TCI) state and a second TCI state used by the terminal device for simultaneous uplink transmission. In some examples, the method further comprises: receiving from the terminal device an indication that the power imbalance between the first TCI state and the second TCI state exceeds the transmit power imbalance threshold. In some such examples, the method further comprises: releasing at least one network resource in response to the indication, the at least one network resource being associated with uplink transmissions performed using the deactivated TCI state in the first TCI state and the second TCI state.

[0021] In a ninth aspect, this specification describes a method comprising: receiving from a terminal device performing simultaneous uplink transmission using a first Transmission Configuration Indicator (TCI) state and a second TCI state an indication that a power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold.

[0022] In a tenth aspect, this specification describes a non-transitory computer-readable medium including program instructions stored thereon for performing at least any of the operations described above with reference to aspects seven through nine. Attached Figure Description

[0023] To better understand this application, reference will now be made to the accompanying drawings by way of example, in which: Figure 1A This is an example of a terminal device communicating with multiple base stations; Figure 1B This is a diagram illustrating the constructive interference of the overlapping transmitted beams of the terminal equipment; Figure 2 This is an example message stream sequence; Figure 3 and Figure 4 This is a flowchart illustrating the various operations that can be performed based on the examples described in this article; Figure 5 It can be configured to execute reference figures 1 to 12. Figure 4 A schematic diagram illustrating example configurations of computing devices for various operations described; Figure 6 These are schematic diagrams illustrating example configurations of base stations that can be configured to perform the various operations described with reference to Figures 1 to 4; and Figure 7 It is an illustration of a computer-readable medium on which computer-readable code can be stored. Detailed Implementation

[0024] In the specification and drawings, the same reference numerals always refer to the same elements.

[0025] In modern telecommunications networks (e.g., New Radio, telecommunications networks), terminal devices can simultaneously use multiple antenna panels and / or beams to perform wireless communication. For example, the network can instruct the terminal device to use a specific beam or antenna available to it to perform uplink (UL) transmission and / or downlink (DL) signal reception. In NR networks, such beam management can be performed using the Transmission Configuration Indication (TCI) signaling framework. Specifically, the network can provide the terminal device with one or more 'TCI status' indications for performing wireless communication.

[0026] In the context of UL transmission, the TCI state can identify one or more beams and / or antenna panels used by an end device when transmitting signals to network nodes. Beams, antenna panels, or TCI states are used interchangeably. In some examples, the TCI state can be associated with an identifier (i.e., a TCI 'state id') that can be provided by the network to the end device to indicate that a particular TCI state applies to the transmission. Additionally or alternatively, the TCI state can include one or more channel parameters used to configure the end device to transmit via the indicated beam. For example, the TCI state can include quasi-co-location (QCL) information associated with one or more antenna ports of the end device. For example, QCL information can include a bandwidth portion (BWP) and a reference signal ID (such as a synchronization signal block SSB, index, or other resource indicator). Furthermore, the TCI state can include UL power parameters and / or a physical cell ID (PCI). Various other aspects of the TCI state will be apparent to those skilled in the art.

[0027] For Physical Uplink Shared Channel (PUSCH) transmissions, the TCI state can identify the SSB index, Channel State Information Reference Signal (CSI-RS) Resource Indicator (CRI), Sound Reference Signal (SRS) Resource Indicator (SRI), or Path Loss Reference Signal (PL-RS) Resource Indicator. The terminal device can then set its analog beamforming coefficients for transmitting PUSCH signals based on the indicated resources. A unified TCI framework can be used to indicate the applicable UL state and DL TCI state. Alternatively, a spatial relational information framework can be used to indicate the UL beam to be used.

[0028] Terminal devices can use multiple TCI states simultaneously to perform transmissions, such as when sending to multiple base stations concurrently. In some examples, multiple antenna panels (or antenna arrays) of the terminal device are used to perform simultaneous transmissions. Figure 1A This transmission is described in the text and can be referred to as 'simultaneous transmission across multiple panels' (STxMP). Alternatively, simultaneous transmission using multiple TCI states can be achieved using different directional beams of a single antenna array, rather than transmission from a single antenna panel.

[0029] As will be understood, in the case of concurrent transmit beam overlap, transmitting signals simultaneously using multiple TCI states can lead to constructive interference. For example, beam overlap can occur when beams steer in the same direction or when their sidelobes overlap. Therefore, when two panels transmit at maximum power (e.g., using a maximum power amplification PA configuration) and their directional transmit beams overlap, resulting in constructive interference, the maximum equivalent isotropic radiated power (EIRP) associated with a UE performing STxMP using two antenna panels is achieved, such as... Figure 1A As depicted in the text. Figure 1B The figure depicts an example of constructive interference between overlapping transmitted beams from a single antenna panel. It will be apparent that maximum EIRP is achieved when the two beams / panels are pointed in the same direction or closely aligned.

[0030] However, regulatory requirements specify limits on both the maximum EIRP and the maximum total radiated power (TRP) of terminal devices. Exceeding these limits may result in excessive interference with other networked devices and / or health risks. Therefore, terminal devices must comply with the maximum TRP and / or maximum EIRP limits to the greatest extent possible. Different maximum transmit power limits are specified for different types of devices and are listed in 3GPP TS38.101-2. For example, 'Power Class 1' specifies a maximum TRP limit of 35 dBm and a maximum EIRP limit of 55 dBm in operating bands n257, n258, n260, n261, and n262, while 'Power Class 2' specifies a maximum TRP limit of 23 dBm and a maximum EIRP limit of 43 dBm in operating bands n257, n258, n260, n261, and n262. Power Class 1 is intended for Fixed Wireless Access (FWA) UEs, while Power Class 2 is intended for vehicular applications. It should be understood that the techniques described herein can also be applied to other power levels, provided that the device under discussion is capable of transmitting simultaneously through multiple TCI states. Output power limits are typically defined per UE rather than per panel.

[0031] When transmitting simultaneously using multiple TCI states, the aforementioned interference between overlapping beams may cause the terminal device's peak EIRP and / or TRP to exceed these limits. In other words, constructive interference between concurrently used overlapping transmission beams may cause the terminal device's peak EIRP to exceed the maximum permissible EIRP in some directions and / or may cause the terminal device's TRP to exceed the maximum permissible TRP. To prevent exceeding regulatory limits, the terminal device may reduce its power amplifier (PA) output power. For example, this can be achieved using Power Management Maximum Power Reduction (P-MPR). As described in 3GPP TS38.101-2, P-MPR allows the terminal device to reduce the maximum transmit power of each of its transmitters to comply with the aforementioned maximum EIRP and / or maximum TRP limits. For example, given a carrier... Service Community The transmit power reduction value (sometimes called the 'power management maximum output power reduction' value) can be expressed as: P-MPR is applied autonomously by the terminal device, and therefore the value is scaled down when reporting power margin to the network. (carrier) Service Community The maximum output power of the terminal device in the configuration.

[0032] While a terminal device can apply the same transmit power reduction to each of the TCI states used for simultaneous transmission, thus symmetrically reducing output power, it can alternatively choose to reduce the transmit power associated with one TCI state by more than the transmit power of another, thus providing an asymmetric reduction in output power. For example, the terminal can asymmetrically reduce output power in the event of radio frequency (RF) impairment, or satisfy the transmit power limitations described above.

[0033] For a given maximum TRP limit, there are many different ways to asymmetricly reduce the transmit power associated with a pair of TCI states to comply with the limit. For example, the table below includes several asymmetric transmit power combinations that can be selected by an end device (e.g., a power class 1 device) for two UL TCI states (TCI A and TCI B) limited by a maximum TRP limit of 35 dBm:

[0034] In the table above, 'OFF' indicates that the TCI B state is turned off or deactivated.

[0035] As described above, the P-MPR mechanism is executed autonomously by the terminal device without the network's knowledge or control. However, the simultaneous asymmetric reduction in transmit power between TCI states can lead to degradation of UL performance or even failure (e.g., Radio Link Failure, RLF). For example, a given base station (e.g., gNB) may only support a certain amount of power imbalance between TCI states. As will be appreciated, the extent to which a base station can support power imbalance can depend on various factors, such as at least one of the following: channel quality (e.g., round-trip time, packet loss rate, etc.), multipath characteristics (e.g., whether the signal arrives at the base station from the terminal device via a line-of-sight path or a non-line-of-sight path), theoretical / measured / reported rank indicator, base station instrument sensitivity, transmission type (e.g., redundant repetition of the same Layer 2 or Layer 4 data), MIMO mode (e.g., a single downlink control information s-DCI or multiple downlink control information m-DCI), gNB processing type (e.g., maximum ratio combination MRC, or others), and / or other factors.

[0036] For example, a single DCI can refer to a situation where a common scheduler is used for two base stations and a single codeword is used for multi-layer transmission. In this case, very similar power levels are needed between the two links to generate throughput gain from the additional links (e.g., less than 3 dB power difference between links). This can be considered a 'true Layer 4 system'. On the other hand, multiple DCIs can refer to a situation where independent schedulers are used for different base stations with little coordination between them (e.g., non-ideal backhaul). In this case, two codewords are used for Layer 4 transmission, so throughput is insensitive to power difference between links. In other words, a large UL power difference between the two links may be acceptable for the base station (e.g., gNB) to generate gain. This can be considered more like a '2×2 Layer 2 system'. In this case, the Rx sensitivity level of one base station may be relevant, but independent of another link to the other base station, when the UL is no longer useful.

[0037] MRC can refer to diversity combination techniques that generate gain by combining multiple links. It can also increase the signal-to-noise ratio (SNR) to mitigate fading. It should be understood that the closer the power levels of each link are, the higher the gain of MRC. On the other hand, selection of the combination only chooses the link with the highest SNR. Since only the 'best' link is selected, differences in the power levels of the individual links are irrelevant.

[0038] Therefore, a mechanism is needed to dynamically control the asymmetric power reduction transmitted from terminal devices on the network side, thereby complying with TRP / EIRP limits while improving network performance and avoiding network failures or degradation. Various implementations of the techniques described herein can meet this need.

[0039] Specifically, the implementation of the technique described herein involves performing simultaneous uplink transmission using a first TCI state and a second TCI state; determining whether a transmission power imbalance between the first TCI state and the second TCI state exceeds a transmission power imbalance threshold; and deactivating one of the first and second TCI states if the transmission power imbalance threshold is exceeded. Some example aspects involve performing uplink transmission using the other TCI state that is not deactivated from the first and second TCI states. Other example aspects involve continuing to perform simultaneous uplink transmission using both the first and second TCI states if the uplink power imbalance threshold is not exceeded.

[0040] In some examples, the terms "terminal device" or "user equipment" can refer to any device a user uses to communicate. Although illustrated schematically... Figure 1AThe term "terminal device" refers to a device that can be carried or worn by the user. However, it should be understood that a terminal device can include a variety of devices, including but not limited to smartphones, laptops, smartwatches, tablets, and vehicle-based terminal devices, such as those installed in cars, buses, unmanned aerial vehicles (UAVs), airplanes, trains, or ships. Alternatively, a mobile terminal device can be carried by the user or worn on their person.

[0041] The following description, by way of example only, details various methods and apparatuses in the context of cellular networks, such as Evolved Universal Terrestrial Radio Access (E-UTRA) networks or 5G networks. However, it should be understood that these technologies are applicable to other types of communication networks (e.g., but not limited to, other types of cellular networks). A cellular network may include one or more base stations, sometimes referred to as transmit / receive points, network nodes, radio access nodes, or access points (e.g., but not limited to gNBs and / or eNBs). Although only two base stations are depicted in Figure 1, a radio access network (RAN, NG-RAN) typically includes thousands of such base stations. The base stations can work together to provide cellular network coverage to one or more terminal devices over a wide geographical area.

[0042] While by no means limited to such an implementation, the examples of the techniques described in this article can be easily integrated into any NR terminal device that performs STxMP communication.

[0043] In some implementations, depending on the characteristics of the cellular network, base stations and terminal devices within the network may be configured to communicate with each other, for example, using OFDM-based communication schemes such as Orthogonal Frequency Division Multiple Access (OFDMA), Single-Carrier Frequency Division Multiple Access (SC-FDMA), and / or Cyclic Prefix Orthogonal Frequency Division Multiple Access (CP-OFDMA)). For example, in some non-limiting examples, OFDMA may be used for downlink (DL) communication, and SC-FDMA or OFDMA may be used for uplink (UL) communication.

[0044] Figure 1A A terminal device 100 communicating with a first base station 150 and a second base station 160 is depicted. Specifically, the terminal device 100 is depicted as performing simultaneous uplink transmissions to both a first network node 150 using a first antenna panel 110 and a second network node 160 using a second antenna panel 120. As described above, Figure 1A Therefore, an example of STxMP for multiple transmit / receive points (multiple TRP) operation is depicted. Although Figure 1ATransmissions from multiple panels are depicted; however, it should be understood that transmissions can alternatively be performed from different beams of the same panel. Typically, implementations of the techniques described herein involve performing simultaneous uplink transmissions using a first TCI state and a second TCI state, as described above. For simplicity, transmissions via antenna panel 110 will henceforth be referred to as being performed using the first TCI state, and transmissions via antenna panel 120 will be referred to as being performed using the second TCI state. However, it should be understood that other mappings between TCI states and beams / antenna panels can be used.

[0045] The antenna panel 110 of the terminal device 100 is associated with a receive (Rx) chain 115 and a transmit (Tx) chain 116, and has multiple beams 110a to 110c. Similarly, the antenna panel 120 is associated with an Rx chain 125 and a Tx chain 126, and has multiple beams 120a to 120c. Wide-angle beams for each antenna panel are also depicted. Although each antenna panel is depicted as having three directional beams, it should be understood that more or fewer beams may be associated with each antenna panel. Furthermore, antenna panel 110 may be associated with a different number of beams compared to antenna panel 120.

[0046] As described above, terminal device 100 can autonomously apply asymmetric power reduction. For example, this can allow terminal device 100 to meet the maximum TRP / EIRP threshold. In some examples, and as referenced below... Figure 2 The terminal device 100 may apply asymmetric power reduction after UL power imbalance is authorized for network use.

[0047] During uplink transmission, terminal device 100 determines whether the transmit power imbalance between the first TCI state and the second TCI state exceeds a transmit power imbalance threshold. In some examples, this threshold is pre-configured at terminal device 100. In other examples, the threshold is received from the network (e.g., via network node 150 or 160) in configuration information (e.g., RRC reconfiguration information).

[0048] As mentioned above, when performing simultaneous transmission with two TCI states, there are many different asymmetric combinations that can be used to achieve a transmit power reduction (P-MPR) value for a given TRP threshold. Several example transmit power reduction values ​​for UE power class 1 with a maximum TRP limit of 35 dBm are given in the table below:

[0049] A transmit power imbalance threshold can be determined to be exceeded when the transmit power reduction values ​​of the first TCI state and the second TCI state differ by at least a threshold (or equivalently, if the power values ​​generated by the applied P-MPR value differ by at least a threshold). For example, if the threshold is 5 dBm, the first three rows in the table above would correspond to the threshold exceeded (note that the first row, where the second TCI state is fully deactivated, can be considered to correspond to a P-MPR value of 35.00 dBm). In contrast, the last two rows (emphasis added) would fall within the threshold.

[0050] Alternatively, instead of specifying a limit on the difference between the P-MPR values ​​used for the first TCI state and the second TCI state, it can be determined that the transmission power imbalance threshold must be exceeded when either the first or second transmission power reduction value exceeds the threshold. Similarly, in the table above, the first three rows will correspond to the thresholds exceeded, and the last two rows will fall within the thresholds.

[0051] In the example of Figure 1, when the transmit power imbalance threshold is exceeded, terminal device 100 is deactivated (possibly in response to a network command, as referenced below). Figure 2 (As described in operation 216) One of the first TCI states and the second TCI state is selected, and the other TCI state, which has not yet been deactivated, is used to perform uplink transmission. In the example in the table above, if the imbalance threshold is exceeded, the first row can be considered the 'default option' and can be used in place of other rows where the threshold is exceeded (i.e., rows 2 and 3). In other words, the threshold imposes an upper limit on the transmission power imbalance. If the transmission power imbalance is higher than the threshold, the terminal device is required to disable one of the TCI states, such as the TCI state with lower power.

[0052] In some examples, if the uplink power imbalance threshold is not exceeded, the terminal device 100 continues to use the first TCI state and the second TCI state to perform simultaneous uplink transmission, while applying the required power reduction value to the first TCI state and the second TCI state (if any).

[0053] The following is for reference. Figure 2 This describes the various signaling aspects of the technology described in this article.

[0054] Figure 2 It is a message flow sequence, typically indicated by reference numeral 2, based on some aspects of the described technology. Message flow sequence 2 illustrates what can be performed, such as reference... Figure 1A Example implementations of various aspects of the described process. In this example, terminal device 100 is shown communicating with two access nodes (base stations 150 and 160) of the network.

[0055] Generally speaking, Figure 2 The process described involves a terminal device using multiple TCI states to perform simultaneous uplink transmissions, such as reference... Figure 1A The situation described.

[0056] It should be understood, for reference Figure 2 The various operations and entities described can correspond to the operations and entities described with reference to the foregoing diagram. It should also be understood that, with reference to Figure 2 The various operations described can be performed by entities other than those explicitly described. For example, some or all of the operations belonging to base stations 150 and 160 can be performed by other network entities, such as another base station or core network (CN) entity.

[0057] In operation 201, a radio resource control (RRC) connection is established between UE 100 and base station 150.

[0058] In operation 202, base station 150 determines a transmit power imbalance threshold for simultaneous uplink transmission performed by terminal device 100. In other words, base station 150 determines the maximum permissible threshold for UL power imbalance. In some examples, the transmit power imbalance threshold may be determined based on the sensitivity of the Rx antenna of base station 150 and / or the UL combination type (e.g., MRC with selected combination, or s-DCI with m-DCI configuration). Additionally or alternatively, the threshold may be determined based on measurements performed by terminal device 100 on signals received from the network (such as L1-RSRP (reference signal received power) measurements of CSI-RS or SSB). In some such examples, the terminal device may perform the measurements for each base station.

[0059] In operation 203, if the threshold determined in operation 202 is met or exceeded, TRP 150 determines which TCI state (e.g., from the first TCI state and the second TCI state) should be deactivated. For example, TRP 150 may determine which transmissions should continue using the first TCI state, but should be stopped using the second TCI state. In other words, it may be determined that the second TCI state should be deactivated, while the first TCI state should remain active. Alternatively, TRP 150 may determine that the first TCI state should be deactivated if the threshold is met, while the second TCI state should remain active.

[0060] As described above, the UL TCI state of the terminal device can correspond to the base station of the network. In this regard, instead of determining which TCI state should be deactivated when the transmit power imbalance threshold is exceeded, TRP 150 can instead identify which TRP, TRP 150 or TRP 160, should maintain UL transmission. For example, it can be determined that UL transmission to TRP 150 should be maintained (which may correspond, for example, to transmission using the first TCI state), while UL transmission to TRP 160 should be stopped (which may correspond, for example, to transmission using the second TCI state) (and vice versa).

[0061] In some examples, operation 203 may include determining the rules that the terminal device should follow when determining which TCI state to deselect / deactivate when a transmit power imbalance threshold is exceeded, rather than determining which specific TCI state to identify. For example, it may determine to deactivate TCI states associated with the lowest quality channel (e.g., as indicated by the lowest reference received power (RSRP), received signal strength indicator (RSSI) measurement, channel quality indicator (CQI), or modulation and coding scheme (MCS) value). Alternatively, TCI states associated with UL transmissions to more distant network nodes may be deactivated for those TCI states associated with UL transmissions to network nodes closer to the terminal device.

[0062] It should be understood that allowing the network to determine which TCI states should be maintained (e.g., based on channel quality measurements) can contribute to improvements in UL spectral efficiency.

[0063] In operation 204, base station 150 sends configuration information (e.g., RRC reconfiguration information) to terminal device 100, including the transmit power imbalance threshold determined in operation 202. In some examples, the configuration information may also include an indication that UL power imbalance can be enabled at terminal device 100 when performing simultaneous uplink transmissions. Additionally or alternatively, the configuration information may include an indication of a TCI state to be deactivated in operation 203 if terminal device 100 meets or exceeds the transmit power imbalance threshold, or an indication of a rule for identifying the TCI state to be deactivated.

[0064] In this way, the network can dynamically limit the permissible power imbalance between two TCI states used by end devices. In some examples, Media Access Control (MAC) signaling can be used instead of RRC reconfiguration mechanisms. This allows for greater flexibility in situations where the network needs to periodically change the thresholds.

[0065] As referenced above Figure 1AThe explanation suggests that alternatively, a transmit power imbalance threshold (e.g., a 3 dB maximum power imbalance) can be pre-configured at the end device. This has the advantage of not introducing RRC signaling overhead, but it is less flexible and may therefore lead to suboptimal UL performance. Similarly, rules for selecting which TCI state to deactivate when the transmit power imbalance threshold is met can also be pre-configured at the end device. In some examples, the threshold or rule pre-configured at the device can be replaced by another rule or threshold (e.g., an updated version) provided by the network in the manner described above.

[0066] In operation 205, base station 150 sends additional configuration or control information to terminal device 100, thereby configuring terminal device 100 to perform simultaneous uplink transmissions to base stations 150 and 160. For example, the additional information may indicate the TCI state (i.e., first TCI state and second TCI state) to be used for UL transmissions to each of base stations 150 and 160, for example, via downlink control information (DCI) or RRC signaling (e.g., RRC reconfiguration information).

[0067] As will be understood, in some examples, the information sent in operations 204, 205 may be combined into a single message and / or divided into additional parts for separate transmission to terminal device 100.

[0068] In operations 206 and 207, terminal device 100 performs simultaneous uplink transmission using the first TCI state and the second TCI state, respectively. For example, this could correspond to a PUSCH transmission.

[0069] In operation 208, terminal device 100 needs to apply asymmetric power reduction to simultaneous uplink transmission. (See above reference...) Figure 1A As mentioned above, there are many ways to select a transmit power reduction value for each of the first and second TCI states in order to meet a given TRP limit. For the sake of brevity, this discussion will not be repeated here.

[0070] Following the determination in operation 206, the process continues with either the operation contained in box 250 or box 260. As will become apparent, the execution of the operation in box 250 or 260 depends on the result of the determination in operation 206.

[0071] In box 250, at operation 209, it is determined that the transmit power imbalance of the terminal device is below a threshold. In other words, the determination in operation 206 indicates that the transmit power imbalance threshold has not been exceeded.

[0072] In operation 210, terminal device 100 readjusts the transmit power reduction values ​​for the first TCI state and the second TCI state based on thresholds. For example, if a new threshold is received at operation 204, the P-MPR value may need to be adjusted to ensure UL performance is maintained. In some examples, the terminal device determines a first desired transmit power reduction value for the first TCI state and a second desired transmit power reduction value for the second TCI state to conform to the maximum total radiated power value or the maximum effective isotropic radiated power value.

[0073] In operations 211 and 212, terminal device 100 continues simultaneous uplink transmission using the first TCI state and the second TCI state, respectively. As will be understood, these operations may correspond to operations 206 and 207 described above. However, for the transmissions in operations 211 and 212, the terminal device applies a transmission power reduction value to the first TCI state and the second TCI state (if any) determined in operation 210.

[0074] In box 260, at operation 213, it is determined that the transmit power imbalance of the terminal device is at or above a threshold. In other words, the determination in operation 206 indicates that the transmit power imbalance threshold is met or exceeded. (See above for reference.) Figure 1A When a transmit power imbalance threshold is met or exceeded, the terminal device deactivates one of the first and second TCI states. The TCI state to be deactivated can be explicitly indicated by the network or determined based on rules, as described above with reference to operation 204.

[0075] In some examples, upon meeting or exceeding a power imbalance threshold, the terminal device deactivates one of the TCI states—a second TCI state—in response to determining that the transmit power imbalance is above the threshold. In other words, the terminal device autonomously deactivates the relevant TCI state when it is determined that the threshold has been exceeded. In other examples, such as those described below with reference to operation 216, the terminal device deactivates the relevant TCI state in response to an instruction from the network (e.g., via base station 150 or 160).

[0076] In operation 214, if the transmit power imbalance threshold is exceeded, the terminal device sends an indication to the network (e.g., via base station 150) that the transmit power imbalance threshold has been exceeded.

[0077] In operation 215, the network (e.g., at base station 150) receives an instruction to release at least one network resource associated with an uplink transmission performed using a TCI state that is deactivated (or to be deactivated) in a first TCI state and a second TCI state. For example, at least one resource may include at least one Physical Resource Block (PRB). For example, if it is determined that the second TCI state needs to be deactivated, the resource associated with the UL connection to base station 160 may be released. Where base stations 150 and 160 have separate schedulers (i.e., they do not share a common scheduler), base station 150 may signal to base station 160 (e.g., via an interface) that it should release the resource associated with UL communication from the terminal device.

[0078] In operation 216, the network instructs the terminal device to deactivate a TCI state. For example, base station 150 may send a signal to the terminal device indicating that one of the TCI states should be deactivated. The terminal device then deactivates the relevant TCI state in response to receiving the instruction from the network. The network may provide the terminal device with a new indication of the TCI state to be used for uplink transmission, wherein the indicated TCI state corresponds to one of the first and second TCI states that was not selected for deactivation.

[0079] In some examples, DCI or RRC signaling can be used to send the information sent in operation 216.

[0080] It should be understood that operation 216 is performed simultaneously with operation 215, or before or after operation 215. As will be further understood, operation 216 may not be performed if the terminal device autonomously deactivates the relevant TCI state in response to determining that a threshold has been exceeded.

[0081] In operation 216, terminal device 100 continues uplink transmission using the remaining TCI state (i.e., the TCI state that has not been deactivated). Similar to operation 206 above, this could correspond to a PUSCH transmission. This is merely an example. Figure 2 The UL transmission in the diagram is described as continuing only for base station 150 (i.e., the first TCI state), but it should be understood that, depending on the configuration of the terminal devices, they may continue only for base station 160 (i.e., the second TCI state).

[0082] Figure 3 It is a flowchart depicting the various operations that can be performed based on various instances. For example, Figure 3 The operations described herein can be performed by a terminal device (e.g., terminal device 100) or other suitable means (such as reference numerals). Figure 5 The device described performs the operation.

[0083] In some examples, operation S3.1 is performed, in which configuration information indicating a transmission power imbalance threshold is received from the network node.

[0084] In some examples, operation S3.2 is performed, wherein a first required transmit power reduction value for a first TCI state and a second required transmit power reduction value for a second TCI state are determined to conform to the maximum total radiated power value or the maximum effective isotropic radiated power value.

[0085] In operation S3.3, simultaneous uplink transmissions are performed using a first TCI state and a second TCI state. In some examples, the uplink transmission performed using the first TCI state is associated with a first network node (e.g., TRP 150), and the uplink transmission performed using the second TCI state is associated with a second network node (e.g., TRP 160).

[0086] In operation S3.4, it is determined whether the transmit power imbalance between the first TCI state and the second TCI state exceeds a transmit power imbalance threshold. In some examples, the transmit power imbalance threshold is received from the network node (as described with reference to operation S3.1). In other examples, the transmit power imbalance threshold is pre-configured at the terminal device.

[0087] In the example of performing operation S3.2, when the first transmit power value for the first TCI state, generated by applying the first required transmit power reduction value, differs from the second transmit power value for the second TCI state by at least a transmit power imbalance threshold, or alternatively, when the first required transmit power reduction value and the second required transmit power reduction value differ from the transmit power imbalance threshold by at least a transmit power imbalance threshold, the transmit power imbalance between the first TCI state and the second TCI state is determined to exceed the transmit power imbalance threshold.

[0088] In operation S3.5, if the transmit power imbalance threshold is exceeded (e.g., in response to the affirmative determination at operation S3.4), one of the first TCI states and the second TCI state is deactivated. Then, in operation S3.6, uplink transmission is performed using the deactivated TCI state from the first and second TCI states.

[0089] In some examples, when a transmit power imbalance threshold is exceeded, an indication is sent to a network node (e.g., TRP150) that the transmit power imbalance threshold has been exceeded. For example, receiving the indication may cause at least one network resource associated with an uplink transmission performed using a deactivated (i.e., deselected) TCI state from a first TCI state and a second TCI state to be released. Again, for example, receiving the indication may cause the network node to begin scheduling new uplink transmissions using the remaining, undeactivated TCI states.

[0090] Alternatively, if the transmit power imbalance threshold is exceeded, one of the first TCI states and the second TCI state may be deactivated based on the quality metric associated with the first TCI state and the second TCI state.

[0091] In operation S3.7, if the transmit power imbalance threshold is not exceeded (e.g., in response to the negative determination at operation S3.4), simultaneous uplink transmission continues using the first TCI state and the second TCI state.

[0092] Of course, it should be understood that Figure 3 The various operations shown can correspond to the operations already described with reference to the preceding diagrams. For example, operation S3.1 can correspond to... Figure 2 Operation 204 and operation S3.2 in the text can correspond to Figure 2 Operation 208 and operation S3.3 in the text can correspond to Figure 2 Operations 206 and 207, and operation S3.4 can correspond to... Figure 2 Operations 209 and 213, and operation S3.5 can correspond to... Figure 2 Operations 214 to 215, and operation S3.6 can correspond to Figure 2 Operation 217, and operation S3.7 can correspond to Figure 2 Operations 210 to 212.

[0093] Figure 4 It is a flowchart depicting various operations that can be performed based on various instances. For example, Figure 4 The operations described herein can be performed by a network node (e.g., TRP 150) or other suitable device (such as a reference). Figure 6 The device described performs the operation.

[0094] In operation S4.1, configuration information indicating a transmission power imbalance threshold is sent to the terminal device to determine whether to deactivate one of the first TCI states and the second TCI state used by the terminal device for simultaneous uplink transmission.

[0095] In some examples, operation S4.2 is performed, wherein an indication is received from the terminal device regarding a power imbalance between the first TCI state and the second TCI state exceeding a transmission power imbalance threshold.

[0096] In some examples, operation S4.3 is performed, wherein, in response to an instruction, at least one network resource is released, which is associated with an uplink transmission performed using a TCI state that is deactivated (or to be deactivated) in the first TCI state and the second TCI state. As explained above with reference to the previous figures, one of the first and second TCI states can be deactivated autonomously by the terminal device or in response to a network instruction. In the latter case, the network can determine that one of the first and second TCI states should be deactivated based on an indication that a transmit power imbalance threshold has been exceeded. The network can then accordingly instruct the terminal device (e.g., by instructing only one of the two TCI states).

[0097] Of course, it should be understood that Figure 4 The various operations shown can correspond to the operations already described with reference to the preceding diagrams. For example, operation S4.1 can correspond to... Figure 2 Operation 204 and operation S4.2 in the text can correspond to Figure 2 Operation 214 in the text, and operation S4.3 can correspond to Figure 2 Operation 215.

[0098] Figure 5 It can be configured to execute reference figures 1 to 12. Figure 4 A schematic diagram of an example configuration of the computing device 5 for the various operations described. For example, the computing device 5 may be configured to perform some or all of the operations described in the reference terminal device 100.

[0099] The computing device may include a control device 500 configured to control the operation of other components forming part of the computing device 5, thereby enabling the execution of reference figures 1 to 5. Figure 4 Various operations are described. The computing device 500 may include a processing device 501 and a memory 502. Computer-readable code 502-2A may be stored in the memory 502 and, when executed by the processing device 501, causes the control device 500 to perform any of the operations described herein.

[0100] In addition, the computing device may also include a display 503, a user interface (UII) 504, a radio frequency interface 505 configured to interface with radio frequency signals transmitted and received via a radio frequency antenna array 505A, and a Global Navigation Satellite System (GNSS) 506. In some examples, other satellite communication systems may be used instead of GNSS 506 or in addition to GNSS 506.

[0101] Figure 6 It can be configured to execute reference figures 1 to 12. Figure 4 A schematic diagram of an example configuration of base station 6 for the various operations described. For example, base station 6 can be configured to perform some or all of the operations described with reference to TRP / network nodes 150, 160.

[0102] Base station 6, which may be referred to as eNB or access point (AP), includes a control device 600 configured to control the operation of other components forming part of base station 6, thereby enabling the transmission and reception of signals to and from UEs near its coverage area. For example, base station control device 600 is configured to transmit reference signals to UEs within its coverage area. Furthermore, in some examples, control device 600 may be configured to receive reference signal measurement data and / or location data from UEs within its coverage area. Control device 600 may also enable communication with other base stations and / or other network nodes. Control device 600 may be additionally configured to perform any other operations described herein with reference to base station 6.

[0103] Base station 6 includes a radio frequency antenna array 605 configured to receive and transmit radio frequency signals. Although Figure 6 Base station 6 in the diagram is shown as an array 605A with three antennas, but this is merely illustrative. The number of antennas can vary, for example, from one to several hundred.

[0104] Base station 6 also includes a radio frequency interface 605 and a control device 60, the radio frequency interface 605 being configured to interface with radio frequency signals received and transmitted by antenna 605A. Radio frequency interface 605 may also be referred to as a transmitter, receiver, and / or transceiver. Base station 6 may also include an interface 607, for example, via which it can communicate with other network elements such as other radio access network entities (such as other base stations) and / or core network entities.

[0105] The base station control device 600 can be configured to process signals from the radio frequency interface 605 to control the radio frequency interface 605 to generate appropriate RF signals to transmit information to the UE via the wireless communication link, and also to exchange information with other base stations 5 and core network entities via the interface 607.

[0106] The control device 600 may include a processing device 601 and a memory 602. Computer-readable code 602-2A may be stored in the memory 602, and when executed by the processing device 601, the computer-readable code 602-2A causes the control device 600 to perform any operation described herein and belonging to the base station 6.

[0107] Further details regarding the components and features of the aforementioned devices / entities / apparatus 5, 6 and their alternatives will now be described.

[0108] The aforementioned control devices 500 and 600 may include processing devices 501 and 601 communicatively coupled to memories 502 and 602. Memories 502 and 602 have computer-readable instructions 502-2A and 602-2A stored thereon, which, when executed by processing devices 501 and 601, cause control devices 500 and 600 to perform actions as shown in Figures 1 to 602. Figure 4 The various operations described. In some cases, control devices 500 and 600 can be collectively referred to as "devices".

[0109] Processing devices 501 and 601 may have any suitable composition and may include one or more processors 501A and 601A of any suitable type or combination of suitable types. In practice, the term "processing device" should be understood to encompass computers with different architectures, such as single / multiprocessor architectures and sequencer / parallel architectures. For example, processing devices 501 and 601 may be programmable processors that interpret computer program instructions 502-2A and 602-2A and process data. Processing devices 501 and 601 may include multiple programmable processors. Alternatively, processing devices 501 and 601 may be programmable hardware, for example, with embedded firmware. Processing devices 501 and 601 may optionally or additionally include one or more special-purpose circuits, such as field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), signal processing devices, etc. In some cases, processing devices 501 and 601 may be referred to as computing devices or processing units.

[0110] Processing devices 501 and 601 are coupled to and operable to read data from and write data to memories 502 and 602. Memory 502 and 602 may include a single memory cell or multiple memory cells on which computer-readable instructions (or code) 502-2A and 602-2A are stored. For example, memories 502 and 602 may include volatile memories 502-1 and 602-1 and non-volatile memories 502-2 and 602-2. In such an example, computer-readable instructions / program code 502-2A and 602-2A may be stored in non-volatile memories 502-2 and 602-2, and may be executed by processing devices 501 and 601 using volatile memories 502-1 and 602-1 for data or temporary storage of data and instructions. Examples of volatile memory include random access memory (RAM), dynamic random access memory (DRAM), and synchronous dynamic random access memory (SDRAM). Examples of non-volatile memory include read-only memory (ROM), programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), flash memory, optical storage devices, and magnetic storage devices.

[0111] Memory 502, 602 may be referred to as one or more non-transitory computer-readable storage media or one or more storage devices. Furthermore, the term "memory" may encompass not only memory including one or more non-volatile memories and one or more volatile memories, but also only one or more volatile memories or only one or more non-volatile memories. In the context of this document, "memory" or "computer-readable medium" can be any medium or component that can contain, store, communicate, propagate, or transmit instructions for use by or in conjunction with an instruction execution system, apparatus, or device (such as a computer).

[0112] Computer-readable instructions / program codes 502-2A and 602-2A can be pre-programmed into control devices 500 and 600. Alternatively, computer-readable instructions 502-2A and 602-2A can reach the control device via electromagnetic carrier signals, or can be copied from a physical entity 7 such as a computer program product, a memory device, or a recording medium such as an optical disc read-only memory (CD-ROM) or a digital versatile optical disc (DVD), examples of which are shown in [reference needed]. Figure 5As shown in the diagram. Computer-readable instructions 502-2A and 602-2A can provide logic and routines that enable physical devices / apparatus 5 and 6 to perform the functions described above. A combination of computer-readable instructions stored on memory (of any type described above) can be referred to as a computer program product. Generally, references to computer programs, instructions, code, etc., should be understood as expressing software (such as programmable content of hardware devices) for programmable processor firmware as instructions for the processor or configured settings or configuration settings for fixed-function devices, gate arrays, programmable logic devices, etc.

[0113] If necessary, the different functions discussed herein can be executed in different orders and / or in parallel with each other. Furthermore, one or more of the above functions can be optional or can be combined, if needed. Similarly, it should be understood that... Figure 5 and Figure 6 The flowchart is merely an example, and the various operations depicted therein can be omitted, reordered, and / or combined.

[0114] Although the methods and apparatus have been described in conjunction with E-UTRA networks, it should be understood that they are not limited to such networks and are applicable to various types of radio networks.

[0115] Although various aspects of the methods and apparatus described herein are set forth in the independent claims, other aspects may include other combinations of features from the described embodiments and / or dependent claims with features of the independent claims, and not just those expressly set forth in the claims.

[0116] It should also be noted that while various examples have been described above, these descriptions should not be considered limiting. Rather, several changes and modifications may be made without departing from the scope of the invention as defined in the appended claims.

Claims

1. A terminal device, comprising: A component for performing simultaneous uplink transmissions using the first Transmission Configuration Indicator (TCI) state and the second TCI state; A component for determining whether the transmit power imbalance between the first TCI state and the second TCI state exceeds a transmit power imbalance threshold. as well as A component for deactivating one of the first TCI states and the second TCI state when the transmit power imbalance threshold is exceeded.

2. The terminal device according to claim 1, further comprising: A component for receiving configuration information from a network node that indicates the transmit power imbalance threshold.

3. The terminal device according to claim 1, The aforementioned transmission power imbalance threshold is pre-configured at the terminal device.

4. The terminal device according to any one of the preceding claims further includes: Components for determining a first required transmit power reduction value for the first TCI state and a second required transmit power reduction value for the second TCI state, in order to conform to the maximum total radiated power value or the maximum effective isotropic radiated power value.

5. The terminal device according to claim 4, Wherein, when the first transmit power value for the first TCI state, generated by applying the first required transmit power reduction value, differs from the second transmit power value for the second TCI state by at least the transmit power imbalance threshold, the transmit power imbalance between the first TCI state and the second TCI state is determined to exceed the transmit power imbalance threshold.

6. The terminal device according to any of the preceding claims further includes: A component for sending an indication to a network node that the transmit power imbalance threshold has been exceeded when the transmit power imbalance threshold is exceeded.

7. The terminal device according to claim 6, The network node's receipt of the indication causes at least one network resource associated with an uplink transmission performed using the deactivated TCI state in the first TCI state and the second TCI state to be released.

8. The terminal device according to any of the preceding claims, If the transmit power imbalance threshold is exceeded, one of the TCI states in the first TCI state and the second TCI state is deactivated based on the quality metric associated with the first TCI state and the second TCI state.

9. The terminal device according to any one of claims 1 to 8, further comprising: A component for receiving information from a network node indicating which TCI state, the first TCI state or the second TCI state, is deactivated when the transmit power imbalance threshold is exceeded.

10. The terminal device according to any of the preceding claims, further comprising: A component for continuing to perform simultaneous uplink transmission using the first TCI state and the second TCI state when the transmit power imbalance threshold is not exceeded.

11. The terminal device according to any of the preceding claims, Uplink transmissions performed using the first TCI state are associated with a first network node, and uplink transmissions performed using the second TCI state are associated with a second network node.

12. A network node, comprising: A component for sending configuration information to a terminal device indicating a transmission power imbalance threshold, for determining whether to deactivate one of the first Transmission Configuration Indicator (TCI) state and the second TCI state used by the terminal device for simultaneous uplink transmission.

13. The network node according to claim 12, further comprising: A component for receiving from the terminal device an indication that the power imbalance between the first TCI state and the second TCI state exceeds the transmission power imbalance threshold.

14. The network node according to claim 13, further comprising: A component for releasing at least one network resource in response to the instruction, the at least one network resource being associated with an uplink transmission performed using a deactivated TCI state in the first TCI state and the second TCI state.

15. A method comprising: Simultaneous uplink transmission is performed using the first Transmission Configuration Indicator (TCI) state and the second TCI state. Determine whether the power imbalance between the first TCI state and the second TCI state exceeds the power imbalance threshold. as well as If the transmit power imbalance threshold is exceeded, one of the first TCI states and the second TCI state is deactivated.

16. A method comprising: Configuration information indicating a transmission power imbalance threshold is sent to the terminal device to determine whether to deactivate one of the first Transmission Configuration Indicator (TCI) state and the second TCI state used by the terminal device for simultaneous uplink transmission.

Images