SYSTEMS AND METHODS FOR RELIABLE DYNAMIC INDICATION FOR SEMI-PERSISTENT CSI-RS

Abstract

According to certain modalities, a method is provided in a wireless device that includes receiving dynamic allocation signaling from a network node to initiate measurement on a semi-persistent CSI-RS resource. An initial measurement is performed on the CSI-RS resource. An initial CSI-RS report, based solely on this first measurement, is transmitted to the network node. A trigger message, distinct from the dynamic allocation signaling, is received from the network node. This trigger message activates semi-persistent CSI notification, and the wireless device initiates semi-persistent notification.

Description

SYSTEMS AND METHODS FOR RELIABLE DYNAMIC INDICATION FOR CSI-RS SEMI-PERSISTENT bMsnnn / cznz / B / YiAi TECHNICAL FIELD The present invention relates, in general, to wireless communications and, more particularly, to systems and methods for reliable dynamic indication of semi-persistent channel status information reference signals (CSI-RS). BACKGROUND OF THE INVENTION The fifth generation of mobile telecommunications and wireless technology is not yet fully defined but is in an advanced draft stage within 3GPP. It includes work on New Radio (NR) access technology in 5G. The terminology Long-Term Evolution (LTE) is used in this invention in a prospective sense to include equivalent 5G entities or functionalities, even if a different term is specified in 5G. 3GPP TR 38.802 VI.0.0 (2016-11) contains an overview of the agreements on 5G New Radio (NR) access technology to date. Final specifications may be published, among other places, in the future 3GPP TS 38.2^ series. The next-generation mobile wireless communication system (5G or NR) can support a diverse set of use cases and a diverse set of deployment scenarios. The latter can include deployment at both low frequencies (100 MHz), similar to current LTE, and very high frequencies (mm waves in the tens of GHz). At high frequencies, propagation characteristics make achieving good coverage challenging. One solution to the coverage problem may include the use of high-gain beamforming, typically facilitated by analog circuitry, to achieve a satisfactory link budget. Beamforming will also be used at lower frequencies (generally digital beamforming using primarily digital circuitry) and is expected to be similar in nature to the already standardized 3GPP LTE (4G) system. Some of the key aspects of LTE are described here. Of particular relevance is the discussion of the Channel Status Information Reference Signal (CSI-RS). A similar signal is expected to be designed for NR as well, and this is the subject of the invention below. Note that the terminology used here, such as gNodeB (gNB) and user equipment (UE), should be considered non-restrictive and, in particular, does not imply any hierarchical relationship between the two. In general, gNB could be read as hhRnnn / eznz / R / YiAi, referring to generic device 1 and UE to device 2, where these two generic devices communicate with each other via a radio channel. Alternatively, other terminology, such as gNodeB, can be used instead of gNB in ​​different communication systems. Here, the focus is on wireless transmissions in the downlink, but the techniques are equally applicable in the uplink. LTE and NR use orthogonal frequency-division multiplexing (OFDM) in the downlink and discrete-dispersion Fourier transform (DFT) OFDM in the uplink. Figure 1 illustrates the basic LTE downlink physical resource. LTE uses OFDM in the downlink and DFT-propagation OFDM in the uplink. The basic LTE downlink physical resource can be viewed as a time-frequency grid, where each resource element (or time / frequency resource element (TFRE)) corresponds to an OFDM subcarrier during an OFDM symbol interval. Although Figure 1 shows a subcarrier spacing of Af = 15 kHz, different subcarrier spacing values ​​are supported in NR. The supported subcarrier spacing values ​​(also referenced for different numerologies) in NR are given by Af = (15 × 2a) kHz, where a is a non-negative integer. Figure 2 illustrates the LTE time-domain structure. In the time domain, LTE downlink transmissions are organized into 10 ms radio frames. Each radio frame consists of ten equally sized subframes of length TSUbframe = 1 ms. In NR, the subframe length is tied to 1 ms, as in LTE. An NR subframe is further divided into a series of intervals, each containing 14 OFDM symbols. The interval length for a reference numerology of (15 × 2) LHz is exactly 2-C1 ms. Resource allocation in LTE is generally described in terms of resource blocks, where one resource block corresponds to one interval (0.5 ms) in the time domain and 12 contiguous subcarriers in the frequency domain. Resource blocks are numbered in the frequency domain, starting with 0 from one end of the system bandwidth. For NR, one resource block is also 12 subcarriers in the frequency domain. Downlink transmissions are dynamically scheduled. For example, in each subframe or interval, the gNB can transmit control information about which terminals the data is being transmitted to and which resource blocks the data is being transmitted over in the current downlink subframe or interval. This control signaling is typically transmitted in the first 1, 2, 3, or 4 OFDM symbols in each subframe in LTE and 1 or 2 OFDM symbols in an interval in NR. A downlink system with 3 OFDM symbols as control for LTE is illustrated in FIGURE Multi-antenna techniques can significantly increase the data rates and reliability of a wireless communication system. Performance is particularly enhanced if both the transmitter and receiver are equipped with multiple antennas, resulting in a multiple-input multiple-output (MIMO) communication channel. Such systems and / or related techniques are commonly referred to as MIMO. Currently, NR is evolving with support for MIMO. A core component of NR is the support for MIMO antenna arrays and related techniques, including beamforming at higher carrier frequencies. Currently, LTE and NR support an 8-layer spatial multiplexing mode for up to 32 transmit (Tx) antennas with channel-dependent precoding. The spatial multiplexing node is designed for high data rates under favorable channel conditions. Figure 4 illustrates an example of spatial multiplexing operation. More specifically, Figure 4 illustrates an example transmission structure of precoded spatial multiplexing mode in LTE and NR. As shown, the information carried by the symbol vector s is multiplied by a precoding matrix n, which serves to distribute the transmission energy in a subspace of the three-dimensional vector space (corresponding to id antenna ports). The precoding matrix is ​​typically selected from a codebook of possible precoding matrices and is usually indicated by a precoding matrix indicator (PMI), which specifies a unique precoding matrix in the codebook for a given number of symbol streams. The r symbols in s correspond to a layer, and r is called the transmission range.In this way, spatial multiplexing is achieved since several symbols can be transmitted simultaneously through the same time / frequency resource element (TERE). The number of symbols r is normally adjusted to suit the current channel properties. LTE and NR use OFDM in the downlink and therefore the received vector Λρ χ 1 yn for a given TERE on subcarrier n (or, alternatively, the number of TERE data n) is modeled by En = HníVsn+ enen where en is a noise / interference vector obtained as realizations of a random process. The precedent n7 can be a wideband precoder, which is constant over frequency, or frequency selective. The precoding matrix is ​​often chosen to match the characteristics of the Afe χ Nt MIMO channel matrix Hn, resulting in what is called channel-dependent precoding. This is also commonly known as closed-loop precoding and essentially aims to focus the transmitted energy into a subspace that is strong in the sense of carrying a large portion of the transmitted energy to the UE. Furthermore, the precoding matrix can also be selected to orthogonalize the channel, meaning that after proper linear equalization at the UE, interlayer interference is reduced. The transmission range, and therefore the number of spatially multiplexed layers, is reflected in the number of precoder columns. For efficient performance, it is important to select a transmission range that matches the channel properties. In LTE and NR, a reference signal, the CSI-RS, is introduced for the purpose of estimating channel state information. The CSI-RS offers several advantages over the Common Reference Symbols (CRS)-based channel state information (CSI) used for this purpose in earlier versions of LTE. First, the CSI-RS is not used for data signal demeasurement and therefore does not require the same density as the CRS (i.e., the overhead of the CSI-RS is substantially lower). Second, the CSI-RS provides a much more flexible means of configuring CSI feedback measurements (e.g., the CSI-RS resource for measurement can be configured in a UE-specific manner). By measuring on a CSI-RS, a UE can estimate the effective channel that the CSI-RS is traversing, including the radio propagation channel and antenna gains. In more mathematical terms, this means that if a known CSI-RS signal, x, is transmitted, a UE can estimate the coupling between the transmitted and received signals (i.e., the effective channel). Therefore, if no virtualization is performed on the transmission, the received signal, y, can be expressed as y = Hx + efen, where, again, e is the noise / interference obtained as realizations of a random process, and the UE can estimate the effective channel H. Up to 32 CSI-RS ports can be configured for an LTE or NR UE. That is, the UE can estimate the channel from up to thirty-two transmit antenna ports. An antenna port is equivalent to a reference signal resource that the UE will use to measure the channel. Therefore, a gNB with two antennas could define two CSI-RS ports, where each port is a set of resource elements in the time-frequency grid within a subframe or interval. The base station transmits one of these two reference signals from each of the two antennas, so that the UE can measure the two radio channels and report channel status information to the base station based on these measurements. In LTE, CSI-RS resources with 1, 2, 4, 8, 12, 16, 20, 24, 28, and 32 ports are supported. In LTE, CSI-RS uses a length-two orthogonal coverage code (OCC) to overlay two antenna ports onto two consecutive resource elements (REs). Figures 5A–5C illustrate resource element grids. More specifically, Figures 5A–5C illustrate RE grids over a pair of resource blocks (RBs) showing the potential positions for LTE version 9 / 10 UE-specific RS, CSI-RS (marked with a number corresponding to the CSI-RS antenna port), and CRS. CSI-RS uses a length-two orthogonal coverage code (OCC) to overlay two antenna ports onto two consecutive REs. As shown in Figures 5A–5C, many different CSI-RS patterns are available. For the case of two CSI-RS antenna ports, we see that there are 20 different patterns within a subframe. The corresponding number of patterns is 10 and 5 for 4 and 8 CSI-RS antenna ports, respectively. For TDD, some additional CSI-RS patterns are available. The CSI reference signal configurations are shown in TABLE 6.10.5.2-1 below, taken from TS 36.211 rr12.5.0. For example, CSI-RS configuration 5 for 4 antenna ports uses (L', 1') = (9,5) in interval 1 (the second subframe interval). Using the formulas below, it can be determined that ports 15 and 16 use OCC on resource elements (k, 1) = (9,5) and (9,6), and ports 17 and 18 use OCC on resource elements (3, 5) and (3,6), respectively (assuming the physical resource block (PRB) index m = 0), where k is the subcarrier index and 1 is the OFDM symbol index within each interval. bMsnnn / cznz / B / YiAi The OCC is then introduced by the factorwi'. - 0 for / >e {15.16}. normal cyclic prefix - 6 for p ε {17.18}. normal cyclic prefix - 1 for pe {19.2(1} normal cyclic prefix - 7 for p ε {21.22} normal cyclic prefix - 0 for pe {15,16} extended cyclic prefix - 3 for pe {17.18} extended cyclic prefix - 6 for pe {19,2(1} extended cyclic prefix - 9 for pe {21,22} extended cyclic prefix CSI 0-19 reference signal configurations, normal cyclic prefix CSI 20-31 reference signal configurations, normal cyclic prefix CSI 0-27 reference signal configurations, extended cyclic prefix pe {15,17,19,21} pe {16,18,20,22} / =0.1 m = 0,1....,79^-1 iri= m + CSI Reference Signal Configuration Number of CSI Reference Signals Configured 1 or 2 4 8 ©, / ') ip mod 2 Yd ip mod 2 (A'', / '} ns mod 2 Frame Structure Type 1 and 2 0 (9,5) 0 (9,5) 0 (9,5) 0 1 (11,2) 1 (11,2) 1 (11,2) 1 2 (9,2) 1 (9,2) 1 (9,2) 1 3 (7,2) 1 (7,2) 1 (7,2) 1 4 (9,5) 1 (9,5) 1 (9,5) 1 5 (8,5) 0 (8,5) 0 6 (10,2) 1 (10,2) 1 7 (8,2) 1 (8,2) 1 8 (6,2) 1 (6,2) 1 9 (8,5) 1 (8,5) 1 10 (3,5) 0 11 (2,5) 0 12 (5,2) 1 13 (4,2) 1 14 (3,2) 1 15 (2,2) 1 16 (1,2) 1 17 (0,2) 1 18 (3,5) 1 19 (2,5) 1 Frame structure type 2 only 20 (11,1) 1 (11,1) 1 (11,1) 1 21 (9,1) 1 (9,1) 1 (9,1) 1 22 (7,1) 1 (7,1) 1 (7,1) 1 23 (10,1) 1 (10,1) 1 24 (8,1) 1 (8,1) 1 25 (6,1) 1 (6,1) 1 26 (5,1) 1 27 (4,1) 1 28 (3,1) 1 29 (2,1) 1 30 (1,1) 1 31 (0,1) 1 Table 6.10.5.2-1: Mapping from CSI reference signal configuration to (k', 1') for normal cyclic prefix In NR, the following three types of CSI-RS transmissions are supported: • Aperiodic CSI-RS transmission: This is a one-shot CSI-RS transmission that can occur in any subframe or interval. Here, a shot means that the CSI-RS transmission only occurs once per trigger in an interval or subframe. The CSI-RS resources (i.e., the resource element locations consisting of subcarrier locations and OFDM symbol locations) for aperiodic CSI-RS are preconfigured to the UEs via upper-layer signaling. Aperiodic CSI-RS transmission is triggered by dynamic signaling. • Periodic CSI-RS transmission: These CSI-RS transmissions are preconfigured by upper-layer signaling, and the preconfiguration includes parameters such as periodicity and subframe offset or LTE-like interval. Periodic CSI-RS is controlled solely by upper-layer signaling, and dynamic signaling is not required to activate it. In other words, periodic CSI-RS transmission begins after RRC configuration, following the configured parameters. • Semi-persistent CSI-RS transmission: Similar to periodic CSI-RS, the resources for semi-persistent CSI-RS transmissions are preconfigured via upper-layer signaling with parameters such as periodicity and subframe offset or interval. However, unlike periodic CSI-RS, dynamic allocation signaling is required to initiate semi-persistent CSI-RS transmission on the preconfigured resources. Figure 6 illustrates semi-persistent CSI-RS transmitted for a limited time (referred to as the semi-persistent CSI-RS allocation time in the figure). In some cases, dynamic deallocation signaling is required to stop semi-persistent CSI-RS transmission. In addition to the various types of CSIRS transmissions, NR also supports several types of CSI reports – the following types of CSI notifications will be supported in NR: • Aperiodic CSI notification: This type of CSI notification involves a one-time (i.e., once) CSI notification by the UE, which is dynamically triggered by the gNB. • Periodic CSI notification: The UE periodically reports CSI. Parameters such as periodicity and subframe offset or interval are configured via upper-layer signaling. • Semi-persistent CSI notification: Similar to periodic CSI notification, semi-persistent CSI notification has a periodicity and subframe offset (or interval). However, a dynamic trigger may be required to start semi-persistent CSI notification. In some cases, a dynamic trigger may be required to stop semi-persistent CSI notification. Regarding the relationship between the different types of CSI-RS and the different types of CSI notification, the following combinations will be supported in NR: • Aperiodic CSI notification with aperiodic CSI-RS • Aperiodic CSI notification with CSI-RS sentient if sentient / periodic • Semi-persistent or periodic CSI notification with semi-persistent or periodic CSI-RS LTE control signaling can be carried out in several ways, including transporting control information in a physical downlink control channel (PDCCH) or a physical uplink control channel (PUCCH), embedded in a physical uplink shared channel (PUSCH), in medium access control control elements (MAC-CEs), or in RRC signaling. Each of these mechanisms is customized to carry a particular type of control information. Control information carried in PDCCH, PUCCH or embedded in PUSCH is physical layer related control information, such as downlink control information (DCI), uplink control information (UCI), as described in 3GPP TS 36.211, 36.212 and 36.213, or corresponding specifications in the 38 series. DCI is generally used to instruct the UE to perform a physical layer function, providing the necessary information to carry it out. The UCI typically provides the network with necessary information such as the Hybrid Auto Repeat Acknowledgement Request (HARQ-ACK), the Scheduling Request (SR), and Channel Status Information (CSI), including the Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Range Indicator (RI), and / or Dispute Resolution Identity (CRI). Both the UCI and DCI can be transmitted on a subframe-by-subframe basis, and are therefore designed to support rapidly changing parameters, including those that may vary with a fast-fading radio channel.Because the UCI and DCI can be transmitted in each subframe, the UCI or DCI corresponding to a given cell tends to be on the order of tens of bits, in order to limit the amount of control overhead. Control information carried in MAC CEs is transported in MAC headers on the uplink and downlink shared transport channels (ULSCH and DL-SCH), as described in 3GPP TS 36.321. Since a MAC header does not have a fixed size, control information in MAC CEs can be sent as needed and does not necessarily represent a fixed overhead. Furthermore, MAC CEs can efficiently carry larger control payloads because they are carried on UL-SCH or DL-SCH transport channels, which benefit from link adaptation, HARQ, and can be turbo-encoded. MAC CEs are used to perform repetitive tasks that use a fixed set of parameters, such as maintaining the time advance or buffer state report, but these tasks generally do not require transmitting a MAC CE on a subframe-by-subframe or interval-by-interval basis. Consequently, channel state information related to a fast-fading radio channel, such as PMI, CQI, RI, and CRI, is not carried on MAC CEs in LTE up to Rel14. Regarding dynamic allocation signaling to initiate semi-persistent CSI-RS transmission, one solution is to use a MAC CE-based indication. Figure 7 illustrates an example of MAC CE-based dynamic allocation signaling to initiate semi-persistent CSI-RS transmission. With this MAC CE-based solution, there is typically a delay, denoted as X, between the dynamic allocation signaling and the start of semi-persistent CSI-RS measurement. This delay includes the following: • MAC CE decoding delay in the UE hhRnnn / eznz / R / YiAi • Delay time due to HARQ ACK / NACK feedback on the dynamic allocation signal sent from the UE to the gNB Therefore, a major problem with dynamic MAC CE-based allocation to initiate semi-persistent CSI-RS measurement is that it involves long allocation latencies. The gNB has little control over the time interval between dynamic allocation and the start of semi-persistent CSI-RS measurement, as this time interval X is determined by the MAC CE decoding delay and the HARQ ACK / NACK feedback delay, etc. Regarding dynamic deallocation signaling to stop semi-persistent CSI-RS transmission, one solution is to use a MAC CE-based indication. Figure 8 illustrates an example of MAC CE-based dynamic deallocation signaling to stop semi-persistent CSI-RS transmission. In Figure 8, the delay between the dynamic deallocation signal and the end of the semi-persistent CSI-RS measurement is denoted as X. Due to the reasons stated above, a major problem with MAC CE-based dynamic deallocation to stop semi-persistent CSI-RS transmission is that it involves long deallocation delays. The gNB has little control over the time interval between dynamic deallocation and the cessation of the semi-persistent CSI-RS measurement, as this time interval Y is determined by the MAC CE decoding delay and the HARQ ACR / NACK feedback delay, etc. Another costly solution for dynamically indicating the start or stop of semi-persistent CSI-RS measurements is to use DCI. Figure 9 illustrates the problems associated with combining semi-persistent CSI-RS measurement with semi-persistent CSI notification. These same problems also arise when semi-persistent CSI-RS is combined with aperiodic (single-trigger) dynamic indication based on CSI notification. This combination of dynamic indication and aperiodic CSI notification for semi-persistent CSI-RS measurement provides better control of the aforementioned X and Y time intervals. However, since there is no HARQ acknowledgment associated with receiving the DCI, the gNB does not know whether the UE has successfully received the DCI indication. Therefore, reliability is a problem associated with DCI-based dynamic indication for starting / stopping semi-persistent CSI-RS measurements. Although FIGURES 7-9 illustrate the problems of combining semi-persistent CSI-RS measurement with semi-persistent CSI notification, the above problems are also present when semi-persistent CSI-RS is combined with aperiodic (single-shot) CSI notification. bMsnnn / cznz / B / Y BRIEF DESCRIPTION OF THE INVENTION To address the aforementioned problems with existing solutions, systems and methods for reliable dynamic indication for semi-persistent CSI-RS are described. According to certain modalities, a method is provided for a wireless device that includes receiving dynamic allocation signaling from a network node to initiate measurement on a semi-persistent CSI-RS resource. An initial measurement is then performed on the CSI-RS resource. A first CSI-RS report, based solely on this initial measurement, is transmitted to the network node. A trigger message, distinct from the dynamic allocation signaling, is received from the network node. This trigger message initiates semi-persistent CSI notification, and the wireless device begins semi-persistent notification. According to certain modalities, a wireless device is provided that includes memory for storing instructions and an operational processing circuit to execute the instructions. This enables the wireless device to receive, from a network node, a dynamic allocation signal to begin measuring a semi-persistent CSI-RS resource. An initial measurement of the CSI-RS resource is performed, and an initial CSI-RS report, based solely on this measurement, is transmitted to the network node. A trigger message, distinct from the dynamic allocation signal, is received from the network node. This trigger message initiates semi-persistent CSI notification, and the wireless device begins semi-persistent notification. According to certain modalities, a method at a network node involves transmitting dynamic allocation signaling to a wireless device to initiate the measurement of a semi-persistent CSI-RS resource. It is determined whether a first CSI-RS report is transmitted by the wireless device in response to the dynamic allocation signaling, and an action is taken based on whether the first CSI-RS report is received in response to the dynamic allocation trigger. According to certain modalities, a network node includes a memory that stores instructions and an operational processing circuit to execute the instructions, causing the network node to transmit dynamic allocation signaling to a wireless device to initiate the measurement of a semi-persistent CSI-RS resource. It is determined whether a first CSI-RS report is transmitted by the wireless device in response to the dynamic allocation signaling, and an action is taken based on whether the first CSI-RS report is received in response to the dynamic allocation trigger. Certain embodiments of the present invention may provide one or more technical advantages. For example, certain embodiments may avoid the long allocation / deallocation latencies associated with schemes such as MAC CE-based allocation / deallocation. According to certain embodiments, a technical advantage may be that the semi-persistent CSI-RS measurement can occur in the same subframe or interval as the activation / allocation trigger. Another technical advantage may be the high reliability of DCI-based allocation or deallocation for initiating or stopping semi-persistent CSI-RS measurements (and thus CSI-RS gNB transmissions), which has a reliability similar to MAC CE-based approaches. Other advantages may be readily apparent to an expert in the technique. Certain modalities may have none, some, or all of the advantages listed. BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the described modalities and their characteristics and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which: FIGURE 1 illustrates the basic physical resource of the long plane downlink (LIE). FIGURE 2 illustrates the time domain structure in LTE. FIGURE 3 illustrates a downlink system with 3 orthogonal frequency division multiplexing (OFDM) symbols as control for LTE. FIGURE 4 illustrates an example of spatial multiplexing operation. FIGURES 5A-5C illustrate resource element grids. FIGURE 6 illustrates the semi-persistent channel status information reference signal (CSI-RS) transmitted for a limited time. FIGURE 7 illustrates an example of dynamic allocation signaling based on the medium access control control element (MAC CE) to start serial-persistent CSI-RS transmission. FIGURE 8 illustrates an example of MAC CE-based dynamic deallocation signaling to stop semi-persistent CSI-RS transmission. FIGURE 9 illustrates the problems for combining semi-persistent CSI-RS measurement with semi-persistent channel status information (CSI) reporting. FIGURE 10 illustrates an example of dynamic allocation based on downlink control information (DCI) for semi-persistent CSI-RS with aperiodic CSI-RS notification, according to certain modalities. FIGURE 11 illustrates an example of DCI-based dynamic assignment for semi-persistent CSI-RS with semi-persistent CSI-RS notification, according to certain modalities. FIGURE 12 illustrates an example of dynamic deallocation based on reliable DCI for semi-persistent CSI-RS with semi-persistent CSI notification, according to certain modalities. FIGURE 13 illustrates an example of a network for a reliable dynamic indication for semi-persistent CSI-RS, according to certain modalities. FIGURE 14 illustrates an example of a wireless device to facilitate reliable dynamic indication for semi-persistent CSI-RS, according to certain modalities. FIGURE 15 illustrates an example of a method for initiating semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. FIGURE 16 illustrates an example of a method for terminating semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. FIGURE 17 illustrates an example of a method by a wireless device to facilitate reliable dynamic indication for semi-persistent CSI-RS, according to certain modalities. FIGURE 18 illustrates an example of a network node for a reliable dynamic indication for semi-persistent CSI-RS, according to certain modalities. FIGURE 19 illustrates an example of a method by a network node to initiate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. FIGURE 20 illustrates an example of a method by a network node to terminate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. FIGURE 21 illustrates an example of a radio network controller or a reliable dynamic indication of a central network node for semi-persistent CSI-RS, according to certain modalities. DETAILED DESCRIPTION OF THE INVENTION Particular embodiments of the present invention can provide reliable dynamic indication solutions for the semi-persistent channel status information (CSI-RS) reference signal. Specifically, certain embodiments can provide reliable downlink control information (DCI)-based dynamic allocation / deallocation for semi-persistent CSI-RS measurements. In some of these embodiments, semi-persistent CSI-RS measurements on the wireless device are initiated by DCI-based dynamic allocation signaling. To ensure reliability, in one embodiment, after a wireless device receives the DCI-based dynamic allocation of semi-persistent CSI-RS from the gNodeB (gNB), the wireless device measures the first instance of semi-persistent CSI-RS and sends a first aperiodic channel status information (CSI) report based on this first measurement to the gNB.In contrast, according to previous reporting systems, a wireless device configured for aperiodic CSI-RS notification would begin measurements upon successful reception of a semi-persistent assignment, but would not transmit the CSI-RS report until it received an aperiodic CSI trigger. According to the methods described herein, however, the first aperiodic CSI-RS report is triggered by the semi-persistent CSI-RS assignment trigger. The gNB can use this first aperiodic CSI-RS report to verify that the UE received the dynamic assignment DCI indication correctly. According to certain other modes, a separate aperiodic CSI measurement report trigger can be sent from gNB to the wireless device after the semi-persistent CSI-RS measurement trigger so that gNB can use the CSI-RS report to verify the successful reception of the semi-persistent CSI-RS trigger by the wireless device. According to another modality, the gNB can activate the semi-persistent CSI-RS notification on the wireless device simultaneously with the same DCI as the semi-persistent CSI-RS measurement, then the gNB can use the semi-persistent CSI reports to verify if the UE has received the trigger correctly. Therefore, in one example, to ensure the reliability of DCI-based dynamic deallocation for stopping semi-persistent CSI-RS measurements, a mechanism is used where, after receiving the DCI-based dynamic deallocation of semi-persistent CSI-RS from the gNB, the wireless device stops measuring semi-persistent CSI-RS. If the wireless device successfully received the DCI-based dynamic deallocation indication, it may not send any more semi-persistent CSI reports after the DCI-based dynamic deallocation indication (i.e., since the semi-persistent CSI-RS measurements have been stopped by the DCI-based dynamic deallocation indication). Therefore, the fact that it no longer receives semi-persistent CSI reports can be used by the gNB to verify that the wireless device successfully received the DCI dynamic deallocation indication.In other words, from gNB's perspective, receiving more semi-persistent CSI reports after a DCI-based dynamic deallocation indication is a negative acknowledgment that the DCI dynamic deallocation indication was successfully received. gNB can then react by initiating a retransmission of the deallocation indication. Specific modes are described in Figures 10-21 of the drawings, using similar numbers for similar and corresponding parts of the various drawings. Figure 10 illustrates an example of DCI-based dynamic assignment for semi-persistent CSI-RS with aperiodic CSI notification, according to certain modes. Specifically, a mechanism is used to ensure the reliability of the DCI-based dynamic assignment for initiating measurements on the wireless device in semi-persistent CSI-RS, and possibly also for initiating CSI-RS transmissions from gNB. Note that initiating a measurement on the wireless device does not necessarily imply that a CSI-RS transmission is initiated; CSI-RS may also be present in earlier intervals, which are used for measurements of another served wireless device.Therefore, when describing the triggering of a measurement on the wireless device, it could mean that gNB begins transmitting the corresponding CSI-RS, or it could mean that gNB simply continues transmitting that CSI-RS if it was initiated earlier. In this mechanism, gNB sends a DCI (possibly via the physical downlink control channel (PDCCH)) indicating that it is starting a semi-persistent CSI-RS measurement. The indication may be included in an uplink data lease. In some cases, the first CSI-RS measurement (and therefore a CSI-RS transmission) may occur in the same subframe or interval as the PDCCH.After receiving the semi-persistent CSI-RS DCI-based dynamic allocation from the gNB, the wireless device measures the first instance of the semi-persistent CSI-RS transmission and sends a first aperiodic CSI-RS report based on the first measurement to the gNB via uplink resources allocated in the uplink data lease. The gNB can use this first aperiodic CSI-RS report to verify that the wireless device successfully received the DCI dynamic allocation indication. If the gNB does not receive the aperiodic CSI-RS report or encounters a CSI decoding error after sending the dynamic allocation via DCI, then the gNB assumes that the wireless device has not successfully received the DCI dynamic allocation and retransmits the DCI dynamic allocation to the wireless device. If the first aperiodic CSI-RS report is successfully received and the wireless device considers the DCI-based dynamic assignment signal successful, then the gNB transmission and the wireless device's semi-persistent CSI-RS measurements continue at the preconfigured periodicity, as shown in Figure 10. Therefore, as shown in Figure 10, only the first aperiodic CSI-RS report is triggered by the DCI-based dynamic assignment signal, and separate aperiodic CSI triggers will trigger subsequent aperiodic CSI reports. That is, the DCI-based dynamic assignment signals both the start of the semi-persistent CSI-RS measurement and a request for the first aperiodic CSI-RS report. The DCI used for dynamic assignment includes at least some of the following fields: • Indication of the start of semi-persistent CSI-RS measurement • Indication of semi-persistent CSI-RS configuration index(s) • Allocation of uplink resources and associated modulation and coding rate In certain other modes, semi-persistent CSI-RS measurement (and the possible initiation of transmission from gNB if CSI-RS is not being transmitted) is combined with semi-persistent CSI notification. Figure 11 illustrates a reliable DCI-based dynamic assignment where semi-persistent CSI-RS measurement and semi-persistent CSI-RS notification are triggered by different DCI indications. In this case, to ensure the reliability of the DCI-based dynamic assignment for initiating semi-persistent CSI-RS measurement, gNB can use a one-shot CSIRS report that immediately follows the first instance of the semi-persistent CSI-RS measurement to verify that the wireless device successfully received the dynamic assignment DCI. This one-shot CSI-RS report captures the wireless device's measurement of the first instance of the semi-persistent CSI-RS transmission.If the gNB does not receive the one-shot CSI-RS report after sending the dynamic assignment via DCI, the gNB assumes that the wireless device has not successfully received the DCI dynamic assignment and retransmits the DCI dynamic assignment to the wireless device. As shown in Figure 11, only the one-shot CSI-RS report is triggered by the DCI-based dynamic assignment signal, and a separate semi-persistent CSI trigger initiates the semi-persistent CSI reports. That is, the DCI-based dynamic assignment signal initiates the semi-persistent CSI-RS measurements (and possibly initiates gNB transmission of CSI-RS) and also triggers the one-shot CSI-RS report. In yet another mode, semi-persistent CSI-RS measurement and semi-persistent CSI-RS notification can be triggered using a single DCI. In this case, semi-persistent CSI-RS measurement is triggered by the DCI in the same way as in modes 2 and 3. However, semi-persistent CSI notification is also triggered by the same DCI. For example, when a wireless device receives the DCI, it assumes that a semi-persistent CSI-RS transmission begins in the same subframe or interval in which the DCI is received, and the UE begins measuring CSI based on the configured CSI-RS and reports CSI periodically according to the configured notification frequency and subframe or interval offsets.If the gNB successfully receives CSIs in the configured subframes or intervals from the wireless device, then the semi-persistent CSI-RS measurement starts successfully; otherwise, if the gNB did not successfully detect the expected CSI reports, then the start is not successful and another DCI would be sent to the UE to start semi-persistent CSI-RS measurements. Mechanisms can also be used to ensure the reliability of DCI-based dynamic deallocation bMsnnn / cznz / B / YiAi to stop semi-persistent CSI-RS measurements (and possibly also to stop CSI-RS transmissions from the gNB if no other wireless device is measuring on this CSI-RS). Figure 12 illustrates reliable DCI-based dynamic deallocation for semi-persistent CSI-RS with semi-persistent CSI notification. According to the depicted mode, after receiving the DCI-based dynamic deallocation of semi-persistent CSI-RS from the gNB, the wireless device assumes that the semi-persistent CSI-RS transmission has stopped after receiving the subframe or interval containing the DCI and, therefore, stops the semi-persistent CSI-RS measurement.If the wireless device successfully received the DCI-based dynamic deallocation indication, it will no longer send semi-persistent CSI reports after the DCI-based dynamic deallocation indication (i.e., given that semi-persistent CSI-RS transmissions have been stopped by the DCI-based dynamic deallocation indication). Thus, the lack of further semi-persistent CSI reports can be used by gNB to verify that the wireless device successfully received the DCI dynamic deallocation indication. In other words, from gNB's perspective, receiving further semi-persistent CSI reports after a DCI-based dynamic deallocation indication is a negative acknowledgment that the DCI dynamic deallocation indication was successfully received.If the gNB receives further semi-persistent CSI notifications after sending the dynamic deallocation via DCI, the gNB assumes that the wireless device has not successfully received the dynamic deallocation from DCI and retransmits the dynamic DCI deallocation to the wireless device. The absence of further semi-persistent CSI reports, as well as the receipt of further semi-persistent CSI reports, can be indicated by whether the CSI reports are being decoded correctly or incorrectly. Multiple notification instances can be monitored to ensure detection reliability. Figure 13 is a block diagram illustrating one mode of an ICO wireless network for reliable dynamic indication for semi-persistent CSI-RS, according to certain modes. The 100 network includes one or more 110A-C wireless devices, which may be referred to interchangeably as 110 wireless devices or 110 UEs, and 115A-C network nodes, which may be referred to interchangeably as 115 network nodes or 115 Nodes. A 110 wireless device can communicate with the 115 network nodes through a wireless interface. For example, the 110A wireless device can transmit wireless signals to one or more 115 network nodes, and / or receive wireless signals from one or more 115 network nodes. The wireless signals can contain voice traffic, data traffic, control signals, and / or any other suitable information. In some modalities, a wireless signal coverage area associated with a 115 network node may be referred to as a cell.In some configurations, 110 wireless devices may have device-to-device (D2D) capability. Therefore, 110 wireless devices can receive signals from and / or transmit signals directly to another 110 wireless device. For example, 110A wireless device can receive signals from and / or transmit signals to 110B wireless device. In certain configurations, network nodes 115 can interact with a radio network controller (not shown in Figure 13). The radio network controller can control the network nodes 115 and can provide certain radio resource management functions, mobility management functions, and / or other appropriate functions. In certain configurations, the functions of the radio network controller can be integrated into the network node 115. The radio network controller can interact with a central network node. In certain configurations, the radio network controller can interact with the central network node through an interconnection network. The interconnection network can refer to any interconnection system capable of transmitting audio, video, signals, data, messages, or any combination thereof.The interconnection network may include all or part of a public switched telephone network (PSTN), a public or private data network, a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAM), a local, regional or global communications or computer network, such as the Internet, a wired or wireless network, a corporate intranet or any other suitable communications link, including combinations thereof. In some configurations, the central network node can manage the establishment of communication sessions and various other functionalities for the 110 wireless devices. The 110 wireless devices can exchange certain signals with the central network node using the non-access stratum signaling layer. In non-access stratum signaling, the signals between the 110 wireless devices and the central network node can pass transparently through the radio access network. In certain configurations, 115 network nodes can interact with one or more other network nodes through a node-to-node interface. For example, 115A and 115B network nodes can interact over an X2 interface. As described above, example network modalities 100 can include one or more wireless devices 110, and one or more different types of network nodes capable of communicating (directly or indirectly) with wireless devices 110. A wireless device 110 can refer to any type of wireless device that communicates with a node and / or another wireless device in a cellular or mobile communication system. Examples of wireless devices 110 include a mobile phone, a smartphone, a PDA (personal digital assistant), a portable computer (e.g., laptop, tablet), a sensor, a modem, a machine-type communication (MTC) / machine-to-machine (M2M) device, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB drives, a D2D-compatible device, or another device that can provide wireless communication.A 110 wireless device may also be referred to as a UE, a station (STA), a device, or a terminal in some modalities. Additionally, in some modalities, the generic terminology radio network node (or simply network node) is used. It can be any type of network node, which may include a Radio Node B, Base Station (BS), Radio Standard (MSR), such as an MSR BS, eNode B, Network Controller, Radio Network Controller (RNC), Base Station Controller (BSC), Relay Donor Node Control Relay, Base Transceiver Station (BTS), Access Point (AP), Transmit Points, Transmit Nodes, RRU, RRH, nodes in the Distributed Antenna System (DAS), Core Network Node (e.g., MSC, MME, etc.), O&M, OSS, SON, Positioning Node (e.g., E-SMLC), MDT, or any other suitable network node.Examples of wireless device 110 modality, network nodes 115 and other network nodes (such as radio network controller or central network node) are described in more detail with respect to FIGURES 14, 18 and 21, respectively. Although FIGURE 13 illustrates a particular arrangement of network 100, the present invention contemplates that the various embodiments described herein can be applied to a variety of networks having any suitable configuration. For example, network 100 may include any suitable number of wireless devices 110 and network nodes 115, as well as any additional elements suitable for supporting communication between wireless devices or between a wireless device and another communication device (such as a landline telephone).Furthermore, although certain modes may be described as implemented in an LTE network, the modes can be implemented in any appropriate type of telecommunication system that supports any suitable communication standard and uses any suitable component, and is applicable to any radio access technology (RAT) or multi-RAT systems in which the wireless device receives and / or transmits signals (e.g., data). For example, the various modes described in this document may be applicable to LTE, LTE-Advanced, LTE-U, Universal Mobile Telecommunications System (UMTS), High-Speed ​​Packet Access (HSPA), Global System for Mobile Communications (GSM), cdmaio, WiMAX, WiFi, other suitable radio access technology, or any suitable combination of one or more radio access technologies.Although certain modes can be described in the context of downlink wireless transmissions, the present invention contemplates that the various modes are equally applicable in the uplink and vice versa. The techniques described in this document are applicable to both License Assisted Access (LAA) LTE and standalone LTE operation on license-free channels. These techniques are generally applicable to transmissions from network nodes 115 and wireless devices 110. Figure 14 illustrates an example of a reliable dynamic indication of the wireless device 110 for semi-persistent CSIRS, according to certain modalities. As shown, the wireless device 210 includes the transceiver 210, the processing circuit 220, and the memory 230. In some modalities, the transceiver 210 facilitates the transmission and reception of wireless signals from the network node 115 (for example, via an antenna 240), the processing circuit 220 executes the instructions to provide some or all of the functionalities described above provided by the wireless device 110, and the memory 230 stores the instructions executed by the processing circuit 220. Examples of a wireless device 110 are provided above. The processing circuit 220 may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of the wireless device. 110. In some embodiments, the processing circuit 220 may include, for example, one or more computers, one or more central processing units (CPUs), one or more processors, one or more microprocessors, one or more applications, and / or other logic. Type 230 memory is generally used to store instructions, such as a computer program, software, or application that includes one or more logic, rules, algorithms, codes, tables, etc., and / or other instructions that can be executed by the processing circuit. Examples of Type 230 memory include computer memory (e.g., random access memory (RAM) or read-only memory (ROM)), mass storage media (e.g., a hard disk drive), removable storage media (e.g., a compact disc (CD) or a digital video disc (DVD)), and / or any other volatile or non-volatile, computer-readable and / or computer-executable memory device that stores information. Other modalities of the 110 wireless device may include additional components beyond those shown in FIGURE 14 that may be responsible for providing certain aspects of the wireless device's functionality, including any of the functionality described above and / or any additional functionality (including any functionality necessary to support the solution described above). Figure 15 illustrates an example of a method by wireless device 110 to initiate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. The method begins in step 304 when wireless device 110 receives a dynamic allocation trigger from network node 115 to begin measuring a semi-persistent CSI-RS resource. In step 306, the first CSI-RS resource measurement is performed. In step 308, a first CSI-RS report, based solely on the first measurement, is transmitted to network node 115. Figure 16 illustrates an example of a method for a Wireless 110 device to terminate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. The method begins in step 404 when the Wireless 110 device receives a dynamic deallocation trigger from a network node to terminate the semi-persistent measurements on a CSI-RS resource. In step 406, the Wireless 110 device terminates the semi-persistent measurements on the CSI-RS resource. Figure 17 illustrates an example of the method for a wireless device 110, according to certain modalities. The method begins at step 502 when the wireless device 110 receives, from a network node 115, dynamic assignment signaling to begin measurement on a semi-persistent CSI-RS resource. According to certain modalities, the semi-persistent CSI-RS resource includes a CSI-RS resource that is configured with at least one CSI-RS transmission periodicity and for which at least one UE assumption applies regarding the transmission and cessation of CSI-RS transmission. As another example, the semi-persistent CSI-RS resource may be configured to transmit CSI-RS on a configured periodicity for a limited time, and the reception of the dynamic assignment signal may be required to trigger semi-persistent CSI-RS transmission on the semi-persistent CSI-RS resource. In certain modes, the dynamic allocation signaling initiates semi-persistent CSI measurements on the CSI-RS resource and also triggers the first CSI-RS report. In one particular mode, the dynamic allocation signaling includes at least one semi-persistent CSI-RS measurement start indication, one indication of the semi-persistent CSI-RS resource configuration index(s), and an allocation of uplink resources and associated modulation and coding rate. In one particular mode, the dynamic allocation signaling comprises a MAC CE In step 504, wireless device 110 hhRnnn / eznz / R / viAi llez'a performs a first measurement on the semi-persistent CSI-RS resource. Wireless device 110 transmits, to network node 115, a first CSI-RS report based only on the first measurement in step 506. In one mode, the first CSI-RS report is an aperiodic report. In another mode, the first CSI-RS report is a semi-persistent report. In step 508, wireless device 110 receives a wake-up message from network node 115 that differs from the dynamic allocation signaling in step 502. Depending on the mode, this wake-up message triggers semi-persistent CSI notification. For example, in one particular mode, the wake-up message includes DCI. In step 510, wireless device 110 initiates semi-persistent notification in response to the activation message. Depending on the specific mode, wireless device 110 can transmit multiple semi-persistent CSI reports. In one particular mode, the Wireless 110 device can stop transmitting semi-persistent CSI reports after a predetermined period of time. In other modes, the Wireless 110 device can receive a dynamic deallocation signal to terminate measurements on the semi-persistent CSI-RS resource and cease semi-persistent measurements on the semi-persistent CSI-RS resource in response to the dynamic deallocation trigger. Figure 18 illustrates an example of a Network Node 115 for reliable dynamic indication for semi-persistent CSI-RS, according to certain modalities. As described above, Network Node 115 can be any type of radio network node or any network node that communicates with a wireless device and / or another network node. Examples of a Network Node 115 are provided above. Network nodes 115 can be deployed throughout the network 100 as a homogeneous, heterogeneous, or mixed deployment. A homogeneous deployment typically describes one composed of the same (or similar) network node types and / or similar cell size, coverage, and inter-site distances. A heterogeneous deployment typically describes deployments using a variety of network node types with different cell sizes, transmission powers, capacities, and inter-site distances. For example, a heterogeneous deployment might include multiple low-power nodes positioned along a macro-cell layout. Mixed deployments can include a combination of homogeneous and heterogeneous portions. Network node 115 may include one or more transceivers 610, processing circuits 620, memory 630, and network interfaces 640. In some configurations, transceivers 610 facilitate the transmission of wireless signals and the reception of wireless signals from wireless device 110 (for example, via an antenna 650), processing circuit 620 executes instructions to provide some or all of the functionality described above provided by a network node 115, memory 630 stores the instructions executed by processing circuit 620, and network interface 640 communicates signals to back-end network components such as a gateway, switch, router, the Internet, public switched telephone network (PSTN), core network nodes, or radio network controllers, etc. In certain configurations, the 115 network node may be capable of using multi-antenna techniques and may be equipped with multiple antennas and be able to support MIMO techniques. The one or more antennas may have controllable polarization. In other words, each element may have two co-located sub-elements with different polarizations (for example, a 90-degree separation as in cross-polarization), so that different sets of beamforming weights will give the emitted wave a different polarization. The 620 processing circuit may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of network node 115. In some modalities, the 620 processing circuit may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, and / or other logic. Memory type 630 is generally used to store instructions, such as a computer program, software, or application that includes one or more logic rules, algorithms, codes, tables, etc., and / or other instructions that can be executed by a processor. Examples of memory type 630 include computer memory (e.g., random access memory (RAM) or read-only memory (ROM)), mass storage media (e.g., a hard drive), removable storage media (e.g., MP3 player, compact disc (CD), digital video disc (DVD)), and / or any other volatile or non-volatile, computer-readable and / or computer-executable memory device that stores information. In some embodiments, network interface 640 is communicatively coupled to processing circuitry 620 and may refer to any suitable device operable to receive input for network node 115, send output from network node 115, perform appropriate processing of the input or output or both, communicate with other devices, or any combination thereof. Network interface 640 may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, for communicating across a network. Other configurations of network node 115 may include additional components beyond those shown in Figure 18 that may be responsible for providing certain aspects of the radio network node's functionality, including any of the functionality described above and / or any additional functionality (including any functionality necessary to support the solutions described above). Different types of network nodes may include components that have the same physical hardware but are configured (for example, through programming) to support different radio access technologies, or they may represent partially or entirely different physical components. Furthermore, the terms "first" and "second" are provided for illustrative purposes only and may be interchangeable. Figure 19 illustrates an example of a method for initiating semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. The method begins at step 702 when network node 115 transmits dynamic allocation signaling to wireless device 110 to initiate measurement on a semi-persistent CSI-RS resource. According to certain modalities, the semi-persistent CSI-RS resource includes a CSI-RS resource that is configured with at least one CSI-RS transmission periodicity and for which at least one UE assumption applies regarding the transmission and cessation of CSI-RS transmission.As another example, the semi-persistent CSI-RS resource can be configured to transmit CSI-RS on a configured periodicity for a limited time, and receiving the dynamic allocation can be required to trigger the transmission of semi-persistent CSI-RS on the semi-persistent CSI-RS resource. In one particular mode, the dynamic allocation signaling includes at least one semi-persistent CSI-RS measurement start indication, one semi-persistent CSI-RS resource configuration index(s) indication, and an uplink resource allocation and associated modulation and coding rate. In one particular mode, the dynamic bbRnnn / eznz / R / YiAi allocation signaling comprises a MAC CE. In step 7.04, it is determined whether a first CSI-RS report is transmitted by the wireless device 110 in response to dynamic allocation signaling. In step 706, network node 115 takes action based on whether the first CSI-RS report is transmitted by wireless device 110 in response to dynamic allocation signaling. In certain modes, determining whether a first CSI-RS report is transmitted by wireless device 110 may involve determining whether the first CSI-RS report was received by network node 115. The first CSI-RS report may indicate to network node 115 that wireless device 110 successfully received the dynamic assignment signal. Therefore, the network node can continue transmitting semi-persistent CSI-RS at a preconfigured interval. In certain other modes, determining whether a first CSI-RS report is transmitted by wireless device 110 may involve determining that the first CSI-RS report was not received by network node 115. Failure to receive the first CSI-RS report may indicate to network node 115 that wireless device 110 did not successfully receive the dynamic assignment signaling. Therefore, network node 115 may retransmit the dynamic assignment signaling to wireless device 110. In one particular mode, wireless device 110 can stop transmitting semi-persistent CSI reports after a predetermined period. In other modes, network node 115 can transmit a dynamic deallocation signal to terminate wireless device 110's measurement of the semi-persistent CSI-RS resource. Additionally, network node 115 can determine whether the wireless device transmits a second CSI-RS report in response to the dynamic deallocation signal and take action based on whether the wireless device transmits a second CSI-RS report in response to the dynamic deallocation signal. Figure 20 illustrates an example of a method by network node 115 to terminate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, according to certain modalities. The method begins at step 802 when network node 115 transmits dynamic deallocation signaling to wireless device 110 to terminate the measurement on a semi-persistent CSI-RS resource. In one particular modality, the dynamic deallocation signaling may include DCI. In step 806, network node 115 determines whether a second CSI-RS report is transmitted by wireless device 110 in response to dynamic deallocation signaling. In step 808, network node 115 takes action based on whether the second CSI-RS report is received in response to dynamic deallocation signaling. In certain modes, it can be determined that the second CSI-RS report was received. Receiving the second CSI-RS report may indicate to network node 115 that wireless device 110 did not receive the dynamic deallocation signal. Therefore, network node 115 may take further steps to retransmit the dynamic deallocation signal. In certain modes, it can be determined that the second CSI-RS report was not received. The absence of a second CSI-RS report may indicate to network node 115 that wireless device 110 successfully received the dynamic deallocation signal. Therefore, network node 115 can take further action after terminating the periodic CSI-RS transmission. Figure 21 illustrates an example of a radio network controller or core network node 900, according to certain modalities. Examples of network nodes may include a mobile switching center (MSC), a GPRS support node (SGSN), a mobility management entity (MME), a radio network controller (RNC), a base station controller (BSC), etc. The radio network controller or core network node 900 includes the processor or processing circuit 920, the memory 930, and the network interface 940.In some modes, the 920 processor executes instructions to provide some or all of the functions described above as provided by the network node, the 930 memory stores the instructions executed by the 920 processor, and the 940 network interface communicates the signals to any suitable node, such as a gateway, a switch, a router, the Internet, a public switched telephone network (PSTN), 115 network nodes, radio network controllers, or 900 core network nodes, etc. The 920 processor may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the functions described for the radio network controller or the 900 core network node. In some embodiments, the 920 processor may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, and / or other logic. 930 memory is generally used to store instructions, such as a computer program, software, or application that includes one or more logic rules, algorithms, code, tables, etc., and / or other instructions that can be executed by a processor. Examples of 930 memory include computer memory (e.g., random access memory (RAM) or read-only memory (ROM)), mass storage media (e.g., a hard drive), removable storage media (e.g., a compact disc (CD) or a digital video disc (DVD)), and / or any other volatile or non-volatile, computer-readable and / or computer-executable memory device that stores information. In some configurations, the 940 network interface is communicatively coupled to the 920 processor and may refer to any suitable device capable of receiving input for the network node, sending output from the network node, performing appropriate processing of the input or output or both, communicating with other devices, or any combination thereof. The 940 network interface may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, for communicating across a network. Other network node modalities may include additional components beyond those shown in FIGURE 21 that may be responsible for providing certain aspects of the network node functionality, including any of the functionality described above and / or any additional functionality (including any functionality necessary to support the solution described above). According to certain modalities, a method can be provided on a wireless device to initiate semi-persistent CSI measurements on a higher-layer configured CSI-RS resource, where the resource is used for CSI notification, and the wireless device is not currently performing measurements on that resource. The method may include: • receive, from a network node, a dynamic allocation trigger to begin measuring a semi-persistent CSI-RS resource; • Carry out an initial measurement of the CSI-RS resource; • transmit to the network a first CSI-RS report based only on the first measurement; • Optionally, the dynamic allocation trigger initiates semi-persistent CSI measurements on the CSI-RS resource and also triggers the first CSIRS report; • Optionally, CSI notification, except for the first CSI-RS report, is triggered by a different trigger message than the dynamic assignment trigger message; • Optionally, the CSI-RS report is an aperiodic report; • Optionally, the CSI-RS report is a semi-persistent report; • Optionally, semi-persistent CSI-RS are transmitted for a predetermined period of time, and the semi-persistent CSI-RS transmissions cease after the predetermined time, and the UE stops providing CSI reports corresponding to the semi-persistent CSI-RS; • Optionally, the dynamic allocation trigger comprises at least one of the following: a semi-persistent CSI-RS measurement start indication, a semi-persistent CSI-RS configuration Index / Indices indication, and an allocation of uplink resources and associated modulation and coding rate; • Optionally, the method also includes receiving a dynamic deallocation trigger for the semi-persistent CSI-RS and ceasing the transmission of CSI reports corresponding to the semi-persistent CSI-RS after receiving the dynamic deallocation trigger. In certain configurations, a wireless device is provided to initiate semi-persistent CSI measurements on a higher-layer configured CSI-RS resource, where the resource is used for CSI notification and the wireless device is not currently performing measurements on it. The wireless device may include: • a memory to store instructions; and • an operable processing circuit to execute the instructions to make the processing circuit: • receive, from a network node, a dynamic allocation trigger to begin measuring a semi-persistent CSI-RS resource; • conduct an initial measurement of the CSI-RS resource; and • transmit to the network an initial CSI-RS report based solely on the initial measurement; • Optionally, the dynamic allocation trigger initiates semi-persistent CSI measurements on the CSI-RS resource and also triggers the first CSIRS report; • Optionally, CSI notification, except for the first CSI-RS report, is triggered by a different trigger message than the dynamic assignment trigger message; • Optionally, the CSI-RS report is an aperiodic report; • Optionally, the CSI-RS report is a semi-persistent report; • Optionally, semi-persistent CSI-RS transmissions are sent for a predetermined time, and the semi-persistent CSI-RS transmissions cease after the predetermined time, and the processing circuit is operable to stop providing CSI reports corresponding to the semi-persistent CSI-RS; • Optionally, the dynamic allocation trigger comprises at least one of the following: a semi-persistent CSI-RS measurement start indication, a semi-persistent CSI-RS configuration index(s) indication, and an allocation of uplink resources and associated modulation and coding rate; According to certain modalities, the method on a wireless device to terminate semi-persistent CSI measurements on a CSI-RS resource configured by higher layers, where the resource is used for CSI reporting, and for which the wireless device is currently performing measurements. The method may include: • receiving a dynamic deallocation trigger to terminate semi-persistent measurements on a CSI-RS resource; and • terminating the semi-persistent measurements on the CSI-RS resource. According to certain modalities, a wireless device for terminating semi-persistent CSI measurements on a higher-layer configured CSI-RS resource, wherein the resource is used for CSI notification, the wireless device comprising: • a memory that would store the instructions; and • an operational processing circuit to execute the instructions to make the processing circuit: • receive, from a network node, a dynamic deallocation trigger to terminate semi-persistent measurements on a CSI-RS resource; • Complete the semi-persistent measurements on the CSI-RS resource. According to certain modalities, a method at a network node for initiating semi-persistent CSI measurements on a CSI-RS resource by a wireless device configured by higher layers, where the resource is used for CSI notification, and the wireless device is not currently performing measurements on it. The method may include transmitting, to the wireless device, a dynamic allocation trigger to initiate measurement of a semi-persistent CSI-RS resource; • determine if a first CSIRS report is received in response to the dynamic assignment trigger; and • take action based on whether the first CSI-RS report is received in response to the dynamic assignment trigger; • Optionally, it can be determined when the first CSI-RS report was received, indicating that the wireless device successfully received the dynamic assignment trigger, and the action further comprises the continuous transmission of semi-persistent CSI-RS with preconfigured periodicity; • Optionally, it can be determined that the first CSI-RS report was not received, indicating that the wireless device did not receive the dynamic assignment trigger; and taking action further includes retransmitting the dynamic assignment trigger to the wireless device. According to certain modalities, a network node initiates semi-persistent CSI measurements on a CSI-RS resource by a wireless device configured at higher layers, where the resource is used for CSI notification, and the wireless device is not currently performing measurements on that resource. The network node may include: • a memory to store instructions; and • an operable processing circuit to execute the instructions to make the processing circuit: • transmit, to the wireless device, a dynamic allocation trigger to initiate the measurement of a semi-persistent CSI-RS resource; • determine if a first CSI-RS report is received in response to the dynamic assignment trigger; and • take action based on whether the first CSI-RS report is received in response to the dynamic assignment trigger. • Optionally, it can be determined that the first CSI-RS report was received, indicating that the wireless device successfully received the dynamic assignment trigger, and the action further comprises the continuous transmission of semi-persistent CSI-RS with a preconfigured periodicity; • Optionally, it can be determined that the first CSI-RS report was not received, indicating that the wireless device did not receive the dynamic assignment trigger; and taking action further includes retransmitting the dynamic assignment trigger to the wireless device. According to certain modalities, a method at a network node for terminating semi-persistent CSI measurements on a CSI-RS resource by a higher-layer configured wireless device, where the resource is used for CSI notification, and the wireless device is currently performing measurements on that resource. The method may include: • transmit a dynamic deallocation trigger to the wireless device to terminate the measurement of a semi-persistent CSI-RS resource; and • determine if a first CSIRS report is received in response to the dynamic deallocation trigger; and • take action based on whether the first CSI-RS report is received in response to the dynamic deallocation trigger; • Optionally, it can be determined that the first CSI-RS report was received, indicating that the wireless device did not receive the dynamic deallocation trigger, and the action may include retransmitting the dynamic deallocation trigger; • Optionally, it can be determined that the first CSI-RS report was not received, indicating that the wireless device received the dynamic assignment trigger; and taking action may include terminating the periodic CSI-RS transmission. According to certain modalities, a network node terminates semi-persistent CSI measurements on a CSI-RS resource by a wireless device configured by higher layers, where the resource is used for CSI notification, and the wireless device is currently performing measurements on that resource. The network node comprises: • a memory that stores instructions; and • an operational processing circuit to execute the instructions to perform the processing circuit: • transmit, to the wireless device, a dynamic deallocation trigger to terminate the measurement of a semi-persistent CSI-RS resource; • determine if a first CSI-RS report is received in response to the dynamic deallocation trigger; and • take action based on whether the first CSI-RS report is received in response to the dynamic deallocation trigger; • Optionally, it can be determined that the first CSI-RS report was received, indicating that the wireless device did not receive the dynamic deallocation trigger, and the action may include retransmitting the dynamic deallocation trigger; • Optionally, it can be determined that the first CSI-RS report was not received, indicating that the wireless device received the dynamic assignment trigger; and taking action may include terminating the periodic CSI-RS transmission. Modifications, additions, or omissions may be made to the systems and apparatus described herein without departing from the scope of the invention. The components of the systems and apparatus may be integrated or separate. Furthermore, the operations of the systems and apparatus may be implemented using any suitable logic comprising software, hardware, and / or other logic. As used herein, "each" refers to each member of a set or each member of a subset of a set. Modifications, additions, or omissions may be made to the methods described herein without departing from the scope of the invention. The methods may include more, fewer, or other steps. Furthermore, the steps may be performed in any suitable order. Although this description has been given in terms of certain embodiments, alterations and permutations of the embodiments will be evident to those skilled in the art. Accordingly, the foregoing description of the embodiments does not restrict this invention. Further changes, substitutions, and alterations are possible without departing from the spirit and scope of this invention, as defined in the following claims. The abbreviations used in the description above include: CRS - Cell-Specific Reference Signal CSI-RS - Channel Status Information Reference Signal gNB - Base Station Node NR HARQ - Hybrid NU Auto Repeat Request - Network PDCCH - Physical Downlink Control Channel PRB - Physical Resources Block RRC - Radio Resource Control EU - User Team

Claims

1. A method (7C0) on a network node (115) for initiating semi-persistent channel state information (CSI) measurements, the method comprising: transmitting, to the wireless device (110), dynamic allocation signaling to initiate measurement on a semi-persistent channel state information (CSI-RS) reference signal resource for which the wireless device is not currently performing measurements; receiving a first CSI report from the wireless device, wherein the first CSI report is based solely on a first measurement of the semi-persistent CSI-RS resource performed by the wireless device in response to the dynamic allocation signaling; and transmitting a trigger message that is different from the dynamic allocation signaling to the wireless device, triggering the semi-persistent CSI notification trigger message; and receiving at least one semi-persistent CSI report in addition to the first CSI report.

2. The method according to claim 1, wherein the dynamic allocation signaling comprises a MAC control element, MAC CE. hhRnnn / eznz / R / viAi 3. The method of any of claim 1 or 2, further comprising: based on receipt of the first CSI report, determining that the wireless device successfully received the dynamic allocation signaling; and taking action based on whether the first CSI report is received, the action comprising continuous transmission of semi-persistent CSI-RS with a preconfigured periodicity.

4. The method of any preceding claim, wherein the first CSI report is a non-periodic report.

5. The method according to any of the preceding claims, wherein the activation message comprises downlink control information, DCI.

6. The method according to any of the preceding claims, wherein the dynamic allocation signaling comprises at least one of the following: a semi-persistent CSI-RS measurement initiation indication; a semi-persistent CSI-RS resource configuration index(s) indication; and an uplink resource allocation and associated modulation and coding rate.

7. The method according to any preceding claim, wherein the semi-persistent CSI-RS resource comprises a CSI-RS resource that is configured with at least one CSIRS transmission periodicity and for which at least one wireless device assumes to apply CSI-RS transmission and cessation.

8. The method according to any preceding claim, wherein: the semi-persistent CSI-RS resource is configured for CSI-RS transmission with a configured periodicity for a limited time; and receipt of the dynamic allocation is required to activate semi-persistent CSI-RS transmission on the semi-persistent CSI-RS resource.

9. The method according to any of the preceding claims, further comprising: transmitting dynamic deallocation signaling to terminate measurement on the semi-persistent CSI-RS resource by the wireless device; determining whether the wireless device transmits a second CSI report in response to the dynamic deallocation signaling; and taking action based on whether the wireless device transmits the second CSI report in response to the dynamic deallocation signaling.

10. A network node (115) for initiating semi-persistent channel state information (CSI) measurements, the network node comprising: a memory (630); and processing circuitry (620) operable to cause the network node to: transmit, to the wireless device (110), dynamic allocation signaling to initiate measurement on a semi-persistent channel state information (CSI-RS) reference signal resource, for which the wireless device is not currently performing measurements; receive a first CSI report from the wireless device, wherein the first CSI report is based solely on a first measurement of the semi-persistent CSI-RS resource performed by the wireless device in response to the dynamic allocation signaling; and transmit a trigger message that is different from the dynamic allocation signaling to the wireless device, triggering the semi-persistent CSI notification trigger message;and receive at least one semi-persistent CSI report in addition to the first CSI report.

11. The network node according to claim 10, wherein the dynamic allocation signaling comprises a MAC control element, MAC CE.

12. The network node of any of claims 10 to 11, wherein the processing circuit is operative to cause the network node: in accordance with receipt of the first CSI report, to determine that the wireless device has correctly received the dynamic allocation signaling; and to perform an action comprising continuous transmission of semi-persistent CS1-KS with a reconfigured periodicity ρ.

13. The network node of any of claims 10 to 12, wherein the first CSI report is a non-periodic report.

14. The network node according to claim 10, wherein the activation message comprises downlink control information, DCI.

15. The network node according to any of claims 10 to 14, wherein the dynamic allocation signaling comprises at least one of the following: a semi-persistent CSI-RS measurement initiation indication; a semi-persistent CSI-RS resource configuration index(s) indication; and an uplink resource allocation and associated modulation and coding rate.

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