Wireless communication method, device, and non-transitory computer-readable medium

Abstract

Methods, systems, and devices are described for implementing beam indication in wireless communications. In one example aspect, a method of wireless communication is disclosed. The method includes receiving a feedback message from a wireless communication node including one or more indicators, where each of the one or more indicators indicates a resource corresponding to a reference signal; and transmitting a message to the wireless communication node including a value of at least one indicator selected from the one or more indicators.

Description

Technical Field

[0001] This patent document relates generally to wireless communications. Background Art

[0002] Mobile communication technology is pushing the world towards an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and wireless communication technologies will need to support a wider range of use case characteristics and provide a more complex range of network access technologies. Summary of the Invention

[0003] This patent document relates to techniques, systems, and apparatus for beam steering in wireless communications.

[0004] In one exemplary aspect, a wireless communication method is disclosed. The method includes receiving a feedback message from a wireless communication node including one or more indicators, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; and sending a control message to the wireless communication node, the control message including a value indicating at least one indicator selected from the one or more indicators.

[0005] In another exemplary aspect, a wireless communication method is disclosed. The method includes sending a feedback message including one or more indicators to a wireless communication node, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; receiving a control message including a value indicating at least one indicator selected from the one or more indicators; and performing a transmission using the resource indicated by the indicator based on the value.

[0006] In another exemplary aspect, a wireless communication method is disclosed, comprising: receiving a reference signal-based feedback message from a wireless communication node, the feedback message including channel state information of a communication link; and sending a message to the wireless communication node to indicate a reception status of the feedback message.

[0007] In another exemplary aspect, a method of wireless communication is disclosed. The method includes: sending a feedback message including resource information to a wireless communication node; and receiving a message from the wireless communication node indicating a receipt status of the feedback message.

[0008] In another exemplary aspect, a wireless communication method is disclosed, comprising: establishing an association between a first reference signal and a second reference signal in a time window; and sending or receiving the second reference signal based on the association.

[0009] These and other aspects and embodiments thereof are described in more detail in the drawings, the description, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 An example of a multiple-input multiple-output (MIMO) system including m transmit antennas and n receive antennas is shown.

[0011] Figure 2 An example of beamforming is shown that improves the carrier-to-interference-plus-noise ratio (CINR) by matching the antenna gain to a specific user entity (UE) location.

[0012] Figure 3 An example of beam direction performed by a base station is shown.

[0013] Figure 4 An example is shown in which a base station sends three channel state information reference signals (CSI-RS) to a user entity and receives corresponding feedback from the user entity.

[0014] Figure 5A An example is shown in which the base station sends confirmation messages only for the two most recent feedback messages from the UE.

[0015] Figure 5B An example of the timing of feedback messages is shown.

[0016] Figure 6A An example of the long delay from the time the UE sends its feedback to the time the base station sends the downlink control indicator (DCI) message for beam indication is shown when the mapping is established via radio resource control (RRC).

[0017] Figure 6B An example of a short delay from the time the UE sends its feedback to the time the base station sends the DCI message for beam indication is shown when the mapping is established via DCI.

[0018] Figure 7 is a flowchart representation of a method of wireless communication.

[0019] Figure 8A An example of reference signals with different beams in different time windows is shown.

[0020] Figure 8B An example of a window of a channel state information reference signal (CSI-RS) associated with a reporting setup or report is shown.

[0021] Figure 9 is an example of a wireless communication system in which the technology according to one or more embodiments of the present technology can be applied.

[0022] Figure 10 A block diagram representation of a portion of a radio station.

[0023] Figure 11is a flowchart representation of a method of wireless communication.

[0024] Figure 12 is another flowchart representation of a method of wireless communication.

[0025] Figure 13 is another flowchart representation of a method of wireless communication.

[0026] Figure 14 is another flowchart representation of a method of wireless communication.

[0027] Figure 15 is another flowchart representation of a method of wireless communication. DETAILED DESCRIPTION

[0028] The demand for greater capacity and higher data rates is being met in part by the rapid growth of wireless communications and technological advancements. Other aspects, such as energy consumption, device cost, spectrum resource allocation, and latency, are also factors in the success of future networks.

[0029] Multiple Input Multiple Output (MIMO) is a method of using multiple transmit and receive antennas to exploit multipath propagation to multiply the capacity of a radio link. Figure 1 An example of a MIMO system including m transmit antennas 101-1, 101-2, ..., 101-m and n receive antennas 102-1, 102-2, ..., 102-m is shown. Receiver 112 receives a signal y resulting from multiplying an input signal vector x from transmitter 110 by a transmission matrix H. MIMO has become an essential element of wireless communication standards including IEEE 802.11n (Wi-Fi), IEEE 802.11ac (Wi-Fi), HSPA+ (3G), WiMAX (4G), and Long Term Evolution (4G LTE). In particular, enhanced MIMO capabilities have been added to 4G LTE wireless communication systems. For example, the reference signal structure is enhanced to include UE-specific reference signals, such as a demodulation reference signal (DMRS), for demodulating the physical downlink shared channel (PDSCH). In addition, a channel state information reference signal (CSI-RS) allows UE downlink channel state information (CSI) measurements. Recent versions of LTE have also improved the downlink control indicator (DCI) format to allow the base station to tell the user entity (UE) that it can assume quasi-co-location of antenna ports with respect to Doppler shift, Doppler spread, average delay, and delay spread. Coordinated multi-point transmission (CoMP) further allows transmit antennas to be physically located on different base stations to implement MIMO. MIMO will continue to play an important role in 5G New Radio (5G-NR) access technology.

[0030] With MIMO, transmitters and receivers can perform beamforming before or during data transmission.Figure 2 An example of beamforming is shown, which improves the carrier-to-interference-plus-noise ratio (CINR) by matching antenna gain to a specific UE location. For example, beamforming allows base station gNB1 201 to modify its transmit signal to provide the best CINR at the output of the channel in the direction of UE1 203. Similarly, base station gNB2 202 can modify its transmit signal to provide the best CINR at the output of the channel in the direction of UE2 204 by performing beamforming.

[0031] Figure 3 An example of beam direction performed by a base station is shown. Figure 3 In this example, base station gNB 301 has twelve beams for transmission. UE 303 has nine beams for reception. Base station gNB 301 sends one or more CSI-RS antenna ports and / or CSI-RS resources to UE 303 to determine which beams it can use for subsequent transmissions with UE 303. Each port or resource can correspond to a specific beam. In this specific example, base station gNB 301 sends twelve coded CSI-RS resources 305-0, 305-1, ..., 305-11, representing twelve beams, to UE 303. UE 303 selects three of the twelve beams: 305-2, 305-5, and 305-9. It then sends back a feedback message that includes CSI-RS resource indicators for CSI-RS resources {305-2, 305-5, 305-9}. After base station gNB 301 receives the feedback message, it can select one or more beams for the CSI-RS resource indicator included in the feedback. For example, it can select beam 305-5 for subsequent transmission. It can also select multiple beams, such as beams 305-2 and 305-5, for subsequent transmission. Then, base station gNB 301 notifies UE 303 which beam it will use, indicated by the CSI-RS resource among {305-2, 305-5, 305-9}, so that UE 303 can receive using the appropriate receive antenna port / beam.

[0032] like Figure 3As shown in , when there are multiple beams between the transmitting end and the receiving end, it is expected that the base station indicates to the UE which beam it will use for subsequent transmission so that the UE can select one or more suitable receiving antenna ports. The base station can notify the UE by including a CSI-RS resource indicator (CRI) in the DCI message to send to the UE. However, when the base station has a large number of available beams, directly indicating multiple CRIs in the DCI increases the signaling overhead between the base station and the corresponding UE. Therefore, there is still a need for improved technology to promote more efficient beam indication between the base station and the corresponding UE. The patent document describes the following technology: allowing the base station to use a small number of bits contained in the control message to indicate beam usage, thereby minimizing the impact of beam indication on signaling overhead. The technology disclosed herein also allows the base station to notify the UE about reference signals, such as CSI-RS that is quasi-co-located with the DMRS port / CSI-RS / SRS port. The UE can then use the reference signal to obtain the large-scale properties of the channel of the DMRS / CSI-RS / SRS.

[0033] SUMMARY

[0034] As previously discussed, a base station may perform beamforming with multiple UEs before or during data transmission. A base station or a transmit antenna physically located on a different base station may send one or more reference signals corresponding to multiple antenna ports to a specific UE. In some embodiments, a base station may send a UE-specific reference signal. The use of a UE-specific reference signal improves the carrier-to-noise ratio (CINR) by matching the antenna gain to the specific UE location. For example, the reference signal may be a CSI-RS comprising up to 16 antenna ports, or other types of downlink RS. Figure 4 An example is shown in which a base station 400 transmits three CSI-RSs 401, 402, and 403 to a UE 410 and receives a corresponding feedback message 404 from the UE 410. In this particular example, CSI-RS 1 (401) is associated with antenna port A, CSI-RS 2 (402) is associated with antenna port B, and CSI-RS 3 (403) is associated with antenna port C.

[0035] Once the UE 410 receives the reference signal, it sends a feedback message 404 to the base station to indicate its preferred beam or beams. The feedback message 404 may include information such as a precoding matrix indicator (PMI), a rank indicator (RI), and a channel quality indicator (CQI). The feedback message 404 may also include other resource indicators corresponding to the preferred beam. The resource indicator may include a CSI-RS resource indicator, a CSI-RS resource set indicator, a CSI-RS resource setting indicator, an antenna port indicator, a timing information indicator for the reference signal, a time window indicator that can be obtained based on information about measurement restrictions, a relative power indicator (RPI), or other types of indicators. In this particular example, the feedback message 404 includes a CS-RS resource indicator (CRI) for CSI-RS2 to indicate that the beam corresponding to CSI-RS2 is preferred. When the UE determines that multiple beams are advantageous, the feedback message 404 may also include more than one resource indicator. In some embodiments, the CRI may be obtained from a resource set. The CRI may also be obtained from a resource setting that includes more than two resource sets. For example, a CRI in a resource setting could be defined as follows:

[0036] CRI in resource setting = resource-level index in resource setting * number of resources in resource set + CRI of resources in resource set.

[0037] A CRI can also be a logical index of a resource in a resource set, and a resource set can select resources from a resource set.

[0038] In some embodiments, the CRI included in the feedback has an association with one or more DMRS antenna ports. Figure 4 In the example shown in FIG, after determining that the beam corresponding to CS-RS2 is favorable, UE 410 reports CRS-RS2 in its feedback message 404. In some embodiments, UE 410 can learn from the base station that the antenna port corresponding to CS-RS2 is a port that is quasi-co-located (QCL) with the DMRS port. For example, CSI-RS2 is quasi-co-located with the antenna port DMRS used in uplink transmission. The transmitter spatial filter of the uplink DMRS / SRS can also be obtained by receiving the spatial filter of CSI-RS2.

[0039] After the base station 400 receives the feedback message 404, it can select the CSI-RS2 for subsequent transmission with the UE 410. Then, it sends an indication to inform the UE 410 of its beam / antenna port selection. To minimize the signaling overhead between the base station 400 and the UE 410, for such indication, the base station 400 can include an index value containing only a few bits instead of a complete CRI. To do so, both the base station 400 and the UE 410 need to store the mapping between the index value of the antenna port and the corresponding indicator.

[0040] For example, as shown in Table 1, a mapping between the index value and the CSI-RS resource indicator can be established. The base station can simply include the index value of the indicator in the message for data transmission. The base station can also include the index value in the message for the next stage of channel measurement.

[0041] Table 1. Example of mapping between index value and indicator

[0042]

[0043]

[0044] In the example shown in Table 1, each of the CSI-RS resource indicators corresponds to an antenna port. The base station can essentially use two bits to indicate which antenna port is used for subsequent transmission. When the index value is “0” and the index value is included in the message for data transmission, the UE can use the receive beam obtained from the reception beam of the CSI-RS resource 1 to receive the DMRS and data. The UE can also take the large properties of the DMRS and the data derived from the large properties of the CSI-RS resource 1. The large properties include one or more of the following properties: delay spread, Doppler spread, Doppler shift, average gain, and average delay. In addition, the UE can take the spatial receiver (Rx) parameters, which can include one or more of the following parameters: angle of arrival (AoA), dominant AoA, average AoA, power angular spectrum (PAS) of AoA, average angle of departure (AoD), power azimuthal spectrum (PAS) of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation, etc.

[0045] In some embodiments, after the UE and the base station receive a feedback message from the UE, they may update the association between the index value and the indicator. For example, the UE and / or the base station may compare the information of the indicator in the feedback message with the information of the indicator stored in the mapping. If the UE and / or the base station finds that the information is the same, it may replace the corresponding indicator stored in the mapping with the indicator in the feedback message. The information of the indicator includes one or more of the following parameters: timing information, an index of a report setting associated with the indicator, an index of a link associated with the indicator, an index of a measurement setting associated with the indicator, an index of a resource setting including the resource indicated by the indicator, an index of a resource set including the resource indicated by the indicator, an index of a resource including the resource indicated by the indicator, channel and / or signal quality information of the resource indicated by the indicator, a sequence number of the indicator in the indicator set, a Tx spatial filter, an Rx spatial filter, and a large attribute of the resource indicated by the indicator. For example, the UE and / or base station finds that there is an indicator associated with Report 1 (such as CRI1), and it receives a feedback message including an indicator for Report 1 (such as CRI6), then the UE and / or base station can replace the indicator in the mapping (such as CRI1) with the indicator in the new feedback message (such as CRI6).

[0046] For example, CSI-RS1 is a non-precoded reference signal corresponding to multiple antenna ports. The base station can refine CSI-RS1 into a collection of CRIs by configuring a QCL assumption between CSI-RS1 and CSI-RS1-j, j=1,2,…Q, or another association between CSI-RS1 and CSI-RS1-j, j=1,2,…Q. The base station and / or UE stores the mapping shown in Table 1 before receiving a feedback message including a selection result among CSI-RS1-j, j=1,2,…Q. For example, after receiving a feedback message including CSI-RS1-2 among other CSI-RS1-j, the base station can update the entry in Table 1 to the entry in Table 2.

[0047] Table 2 Example of mapping between update index values ​​and indicators

[0048] INDEX INDICATOR 0 CSI-RS Resource 1-2 1 CSI-RS Resource 2 2 CSI-RS Resource 5 3 CSI-RS Resource 7

[0049] In some embodiments, the base station may choose to send a response when it receives channel state information from the UE to inform the UE whether it has successfully received the feedback. The base station can only send a response if the feedback meets a predetermined set of criteria. For example, the base station only sends a response when the feedback includes indicators such as one or more of the following indicators: CSI-RS port indicator, CSI-RS resource indicator, resource set indicator, resource setting indicator, time window indicator, or RPI (relative power indicator). In some embodiments, the time window indicator can be obtained using metric restriction information. If the feedback message only includes information such as PMI, CQI, or RI, the base station can remain silent without sending a response. The base station can further check the value of the indicator to decide whether it should send a response. For example, the base station only sends a response when the RPI vector includes a zero element, or only when the RPI vector includes an element with a value less than a predetermined threshold. If the base station finds that the RPI vector does not include a zero element, or that the values ​​of all the elements it includes are greater than a predetermined threshold, the base station can choose not to send a response to the feedback message. Only when the UE receives a response and the response means that the base station has successfully received the feedback message, the UE can use the indicator in the feedback message to update the mapping. In some embodiments, the UE can perform other actions based on the response.

[0050] In some embodiments, a base station may receive a large number of feedback messages from a UE. In order to minimize the signaling overhead of responses between the base station and the corresponding UE, it is desirable for the base station to limit the number of feedback messages to which it sends responses. Figure 5A An example is shown where the base station sends a DCI message 509 including only responses to the two most recent feedback messages 506 and 508 from the UE. Figure 5AIn the example, the base station sends a first DCI message DCI1 (501) at time t0. Subsequently, it receives L (e.g., seven) feedback messages 502-508 from the UE until it sends a DCI message DCI2 (509). The base station first checks whether the feedback message includes information that meets a predetermined set of criteria. In this particular example, the feedback messages 502, 505, 507 do not contain the necessary information that meets the predetermined set of criteria to trigger the base station to send a response to the feedback message. On the other hand, the base station finds that M (e.g., four) feedback messages 503, 504, 506, and 508 include the necessary information. However, in order to control signaling overhead, the base station only includes responses to the N (e.g., two) most recent feedback messages 506 and 508 in its DCI2 message (509). The base station then sends the DCI2 message (509) at t1. In addition, DCI1 and DCI2 can be of the same type. For example, DCI1 and DCI2 are both DL-Grants and / or both include a beam indication field. The beam indication field may also be a field indicating the QCL relationship between two reference signals.

[0051] Definition of the meaning of the mapping

[0052] When the base station receives a small number of feedback messages from the corresponding UE, it is not necessary to assign additional meaning to the index value (see Table 1 and Table 2). However, when the corresponding UE sends a large amount of feedback (for example, in a CoMP scenario), it is desirable to assign meaning to the index value to facilitate the maintenance of the mapping at both the base station and the UE. In addition, based on the complexity of the feedback messages, one or more mappings can be stored, each of which accommodates a type of association between an index value and a resource indicator.

[0053] In some embodiments, the index value may simply indicate an indicator with timing information. For example, the index value may correspond to the transmission or reception time of the indicator. Table 3 shows an example of a mapping sorted by the reception time of the indicator. In this example, the most recently received indicator (e.g., the last time slot) is placed at index 0, while the oldest indicator (e.g., the fourth to last time slot) is placed at index 3. In some embodiments, the UE and the base station may place a predetermined interval (e.g., K) between each of the feedback messages. i For example, a feedback message is received at the fourth to last time slot n. At the third to last time slot n+K i The next feedback message is received at the penultimate time slot n+K i +K j and the last time slot n+K i +K j +K lThe base station may then send a DCI message including the index value at a subsequent time slot. i , K j and K1 may have the same or different values, such as zero or an integer greater than 0. In some embodiments, the UE and the base station may agree on the interval between the transmission or reception time of each of the feedback messages and the index value, as long as the interval is greater than a predetermined interval.

[0054] Table 3 Mapping examples sorted by the reception time of feedback messages

[0055] INDEX INDEX MEANING INDICATOR 0 CRI received at the last slot CSI-RS Resource 1 1 CRI received at the second to last slot CSI-RS Resource 2 2 CRI received at the third to last slot CSI-RS Resource 5 3 CRI received at the fourth to last slot CSI-RS Resource 7

[0056] like Figure 5B As shown in , both the base station and the UE can obtain Table 4 based on the criteria given by Table 3. The last feedback message is received in time slot n1, which includes information that meets a set of predetermined criteria. Its corresponding indicator is placed at index 0. Similarly, the second-to-last qualified feedback message is received in time slot n2, and its corresponding indicator is placed at index 2. The oldest qualified feedback message is received at time slot n4, and its corresponding indicator is placed at index 3. Similarly, the UE and the base station can agree on a predetermined interval (e.g., K time slots) between each of the feedback messages. For example, a feedback message is received at the fourth-to-last time slot n4. The next feedback message is received at the third-to-last time slot n3=n4+K. Subsequent feedback messages are received at the second-to-last time slot n2=n3+K and the last time slot n1=n2+K. The base station can then send a DCI message including the index value at time slot n1+K. K can be zero or an integer greater than zero.

[0057] Table 4 Another example of mapping sorted by reception time of feedback messages

[0058]

[0059]

[0060] Although the index values ​​in the above example are sorted by the time the feedback message was received, it should be understood that other types of mapping based on timing information may also be used. The base station and the UE may use another predetermined rule to establish a sample mapping between the index values ​​and the corresponding meanings shown in the first and second columns of Table 3-4. This rule may also be communicated between the base station and the UE using a message such as a higher-layer control message before time slot n4 or before time slot n, where the base station transmits DCI including the index values.

[0061] In some embodiments, the index value can indicate an indicator for reporting settings. Table 5 shows an example of a mapping where the index value corresponds to an indicator for various reporting settings. The base station and the UE can establish the mapping of index value and index meaning using a predetermined rule and / or using a message. For example, when the UE’s feedback indicator indicates CSI-RS resource 1 for reporting setting 1, the UE and the base station know that index value “0” points to CSI-RS resource 1. When the UE’s feedback indicator indicates CSI-RS resource 2 for reporting setting 2, the UE and the base station know that index value “1” points to CSI-RS resource 2, and so on. If later the UE feedback indicator indicates CSI-RS resource 6 for reporting setting 1 (not shown in Table 5), the UE and the base station know that index value “0” points to CSI-RS resource 6. The same indicator for different reporting settings can correspond to different resources. For example, indicator 1 corresponds to resource 1 of resource setting 1 associated with reporting setting 1, and indicator 1 corresponds to resource 1 of resource setting 2 associated with reporting setting 2.

[0062] Table 5 Example of mapping where index value means reporting setting

[0063] INDEX INDEX MEANING RESOURCE INDICATOR 0 CRI for reporting setting 1 CSI-RS Resource 1 1 CRI for reporting setting 2 CSI-RS Resource 2 2 CRI for reporting setting 3 CSI-RS Resource 5 3 CRI for reporting setting 4 CSI-RS Resource 7

[0064] In some embodiments, the index value can be associated with a CRI having a channel quality, such as a reference signal received power (RSRP) value, a reference signal received quality (RSRQ) value, a CQI (channel quality indicator), or other channel quality value. For example, the UE and the base station establish a mapping between index value and index meaning as shown in Table 6 using a predetermined rule or via a control message. The UE includes {CRI3, CRI2, CRI5, CRI7} in its feedback message, each of the CRI corresponding to {CSI-RS resource 3, CSI-RS resource 2, CSI-RS resource 5, CSI-RS resource 7}, respectively. The UE also includes RSRP values for {CSI-RS resource 3, CSI-RS resource 2, CSI-RS resource 5, CSI-RS resource 7} in its feedback message. In this particular example, the RSRP values are {40 dB, 20 dB, 10 dB, 5 dB}, respectively. Then, based on the corresponding RSRP values, the UE and the base station know that index value “0” points to resource for CSI-RS resource 3, as shown in the third column of Table 6.

[0065] Table 6 Example of mapping of index value related to channel quality

[0066] INDEX INDEX MEANING INDICATOR 0 CRI with the best channel quality CSI-RS Resource 3 1 CRI with the second best channel quality CSI-RS Resource 2 2 CRI with the third best channel quality CSI-RS Resource 5 3 CRI with the fourth best channel quality CSI-RS Resource 7

[0067] An index value can also have a composite meaning. For example, in some cases, a feedback message can include one or more resource indicators. An index value can indicate not only the transmission / reception time of the indicator, but also the order of the indicator in the feedback message.

[0068] Table 7 shows an example of the mapping, where the index value shows the order of the CRIs included in the feedback message and the reception time of the indicator. The UE and the base station establish the mapping between the index value and the corresponding meaning, as shown in Table 7. The order of the time slots is determined by the time domain gap between the time slot of the feedback message including the CRI and the time slot of the DCI message including the index value. For example, feedback message A includes three CRIs: {CSI-RS resource 3, CSI-RS resource 2, CSI-RS resource 5}. These indicators are received at time slot k. Before receiving feedback message A, the base station receives another feedback message B at time slot k-5. Feedback message B includes one CRI: CSI-RS resource 7. The mapping is arranged accordingly based on the order of the CRIs in the feedback message and the time at which the feedback message is received.

[0069] Table 7 Example of mapping where the index value indicates the order of the CRIs

[0070]

[0071] It should be noted that in the above description, various meanings are provided as examples to facilitate understanding of the disclosed technology. However, it should be understood that the index value can use other meanings, such as various resource settings, measurement settings, or links between various resource settings and reporting settings, to facilitate maintenance of the mapping. The index value can also have a composite meaning to allow the communication node to more effectively manage the association between the resource indicators and the beam / antenna ports.

[0072] In some embodiments, the index value can be understood as an indicator of a parameter set. The parameter set includes information about the indicator or feedback message. This information can be used by the UE to distinguish an indicator from many indicator feedbacks to facilitate the maintenance of the mapping. The information includes one or more of the following information: timing information of the resource indicated by the indicator, timing information of the feedback message including the indicator, index of the report setting associated with the indicator, index of the link associated with the indicator, index of the measurement setting associated with the indicator, index of the resource setting including the resource indicated by the indicator, index of the resource set including the resource indicated by the indicator, index of the resource including the resource indicated by the indicator, signal quality information and / or channel of the resource indicated by the indicator, and sequence number of the indicator in the set of indicators. When the base station configures the mapping or obtains it using a predetermined rule, the above information for the indicator can be configured by the base station. The UE can obtain the indicator indicated by the index value based on this information. In particular, in the above example shown in Table 3-7, the mapping between the index value and the indicator is established based on the CRI. However, it should be understood that the mapping between the index value and the indicator can also be established by both the CRI and the reference signal such as DMRS / CSI-RS / SRS contained in the feedback message. For example, when the index value is in a message for data transmission such as DL-Grant, the CSI-RS resource and / or CSI-RS port indicated by the indicator has a quasi-co-location relationship with the DMRS. When the value index is in a message for triggering CSI-RS / SRS for the next stage of channel measurement, the CSI-RS resource and / or CSI-RS port indicated by the indicator may also have a quasi-co-location relationship with the CSI-RS / SRS. In some embodiments, the composite meaning of the index is changed from Table 6 to Table 8, as shown below.

[0073] Table 8 Another example of mapping index values ​​associated with channel quality

[0074]

[0075] In the specific example shown in Table 8, if the CRI with the best quality is CRI3 corresponding to CSI-RS resource 3, the UE receives index value "0" information from the base station along with the index value in the message for data transmission. The UE can receive the DMRS and data using the receive beam obtained from the receive beam of CSI-RS resource 1. The UE can also obtain large-scale properties of the DMRS and data derived from the large-scale properties of CSI-RS resource 3. Large-scale properties include one or more of the following: delay spread, Doppler spread, Doppler shift, average gain, and average delay.

[0076] In some embodiments, the UE may obtain spatial Rx parameters including one or more of the following parameters: AoA, primary AoA, average AoA, power angular spectrum (PAS) of AoA, average AoD, PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation. In some embodiments, the index value also indicates the association between the Rx spatial filter of the CSI-RS and the Rx spatial filter of the DMRS indicated by the indicator. The UE may obtain the spatial Rx spatial filter of the DMRS based on the Rx spatial filter of the CSI-RS. The association may also be with the Rx spatial filter of the CSI-RS indicated by the indicator and the Tx spatial filter of the uplink SRS / DMRS. The UE may obtain the spatial Tx spatial filter of the uplink SRS / DMRS based on the Rx spatial filter of the CSI-RS.

[0077] MINIMIZING DELAY

[0078] In some embodiments, the mapping of index values ​​and corresponding resource indicators can be established via advanced signaling such as radio resource control (RRC). Table 9 shows an example of a mapping established via RRC. The examples shown in Tables 1-8 can also be established via RRC messages.

[0079] Table 9 Example of mapping established via RRC

[0080] INDEX INDEX MEANING INDICATOR 0 First entry established by RRC CSI-RS Resource 1 1 Second entry established by RRC CSI-RS Resource 2 2 Third entry established by RRC CSI-RS Resource 3 3 Fourth entry established by RRC CSI-RS Resource 4 4 Fifth entry established by RRC CSI-RS Resource 5 5 Sixth entry established by RRC CSI-RS Resource 6 6 Seventh entry established by RRC CSI-RS Resource 7 7 Eighth entry established by RRC CSI-RS Resource 8

[0081] However, using high-level signaling such as RRC to establish the mapping may not be very efficient and may introduce additional delays. Figure 6A As shown in FIG, the delay 601 from the time the UE sends its feedback to the time the base station sends the DCI message for beam indication is long. To reduce this delay 601, a large mapping can be established via RRC. However, a large mapping may increase the overhead of DCI message delivery. For example, the mapping may include a total of N CSI-RS resources for beam selection. In order to effectively indicate N resources in the mapping, the DCI message needs When N is a very large number (e.g., 256 or more), this overhead may be unacceptable.

[0082] Alternatively, the mapping may be established via DCI message exchange. Table 10 shows an exemplary mapping established via DCI message delivery. The examples shown in Tables 1-8 may also be established via DCI message delivery. Figure 6BAs shown in FIG, the delay 603 between the feedback from the base station and the DCI message is shorter. DCI overhead can also be reduced because the index value is associated with the UE's CRI feedback and the number of beams selected by the UE is much smaller than the total number of beams available at the base station. For example, different beams are represented by different CSI-RS resources and / or different CSI-RS antenna ports. The total number of beams at the base station is 256, which requires 8 bits as the index value for the beam indication. The number of beams selected by the UE is typically no more than 8. Therefore, only 3 bits are required to indicate the corresponding beam in the index value.

[0083] Table 10 Example of mapping established via DCI

[0084] INDEX INDEX MEANING RESOURCE INDICATOR 0 First entry established by DCI CSI-RS Resource 1 1 Second entry established by DCI CSI-RS Resource 2 2 Third entry established by DCI CSI-RS Resource 5 3 Fourth entry established by DCI CSI-RS Resource 7

[0085] HANDLING TRANSMISSION FAILURES

[0086] Sometimes, feedback from a UE may not be successfully transmitted to the base station. In those cases, the base station may still need to indicate which beam / antenna port should be used for subsequent transmission. In some embodiments, the base station may want to indicate a different beam / antenna port than that included in the feedback from the UE. Therefore, it is desirable that the base station and the corresponding UE include a subset of associations between index values, and an indicator of resources can be established without UE feedback, and another subset of associations can be established using UE feedback. For example, as shown in Table 11, the subset of associations without UE feedback is established by a predetermined rule and / or by a message such as an advanced control message.

[0087] In some embodiments, the base station sends information to the UE to indicate whether the mapping may include at least one association between the indicator in the feedback message and the index value.

[0088] When the base station does not receive feedback from the UE, the association subset established without UE feedback allows the base station to fall back to a set of beams / antenna ports. The subset also allows the base station to make alternative choices beyond those provided by the UE feedback.

[0089] In some embodiments, a subset of associations established without UE feedback can be maintained in a single map along with other entries with UE feedback, such as shown in Table 11. In some implementations, this subset can also be placed in a separate map. The subset of index values ​​indicating associations established by RRC and / or UE feedback messages can be configured by a control signal. For example, the control signal notifies that an index set of {0-4} is used for associations established by RRC, as shown in Table 11.

[0090] Table 11 includes an example of a mapping of default entries

[0091] INDEX INDEX MEANING INDICATOR 0 First entry established by RRC CSI-RS Resource 1 1 Second entry established by RRC CSI-RS Resource 2 2 Third entry established by RRC CSI-RS Resource 5 3 Fourth entry established by RRC CSI-RS Resource 7 4 First CRI included in UE feedback CSI-RS Resource 3 5 Second CRI included in UE feedback CSI-RS Resources 4-6 6 Third CRI included in UE feedback CSI-RS Resource 6 7 RESERVED RESERVED

[0092] UPDATING THE MAPPING

[0093] When a base station and a corresponding UE exchange feedback and beam indication messages, it is important for them to update the mapping based on the information included in the messages. In some cases, the information included in the feedback messages may be time-sensitive, so it is desirable to only keep relevant information from the most recent feedback message, thereby reducing the amount of information stored in the mapping.

[0094] One or more mappings may be updated based on one or more meanings of the index value. For example, in some embodiments, the base station and UE may simply update the mapping based on time information. The mapping may be updated in a "first-in, first-out" manner. Tables 12-A to 12-C illustrate examples of updating a mapping based on the time of receipt of an indicator. Table 12-A illustrates an example of a mapping stored by a base station and corresponding UE at time slot k+3. The mapping is limited to four entries so that the base station can indicate which beam / antenna port to use with two bits.

[0095] Table 12 - Example of mapping at time slot k+3

[0096] INDEX INDEX MEANING INDICATOR 0 CRI received at the last slot (e.g., slot k+3) CSI-RS Resource 1 1 CRI received at the second to last slot (e.g., slot k+2) CSI-RS Resource 2 2 CRI received at the third to last slot (e.g., slot k+1) CSI-RS Resource 5 3 The CRI received at the fourth-to-last time slot (e.g., time slot k) CSI-RS resource 7

[0097] Table 12-B shows the updated table at time slot k + 4. The base station receives new feedback at time slot k + 4 including CSI-RS resource 6. The base station replaces the oldest entry at index 0 (CSI-RS resource 1) with CSI-RS resource 6 included in the latest feedback and pushes the other CRIs stored in the map, as shown in Table 12-B.

[0098] Table 12-B Example of mapping at time slot k+4

[0099] index Index meaning indicator 0 CRI received at the last time slot (e.g., time slot k+4) CSI-RS Resource 6 1 CRI received at the second to last time slot (e.g., time slot k+3) CSI-RS resource 1 2 CRI received at the third-to-last time slot (e.g., time slot k+2) CSI-RS resource 2 3 The CRI received at the fourth-to-last time slot (e.g., time slot k+1) CSI-RS Resource 5

[0100] Alternatively, the entries may be rearranged, such as shown in Table 12-C, so that the index values ​​correspond to the chronological order in which the feedback message was received. In some cases, the base station may check existing indicators to see if the indicator included in the feedback message has already been added to its map. If so, the base station may skip updating the map.

[0101] Table 12-C Another example of mapping at time slot k+4

[0102]

[0103]

[0104] In some embodiments, the base station and UE may update the mapping based on the reporting settings included in the feedback. Tables 13-A and 13-B illustrate examples of updating the mapping based on the reporting settings. Table 13-A illustrates an example of a mapping stored by the base station and the corresponding UE at time slot k+3. The mapping is limited to four entries, each corresponding to a different reporting setting.

[0105] Table 13-A Example of mapping at time slot k+3

[0106] index Index meaning Resource Indicator 0 CRI for Reporting Setting 1 CSI-RS resource 1 1 CRI for reporting setting 2 CSI-RS resource 2 2 CRI for reporting setting 3 CSI-RS Resource 5 3 CRI for Report Setting 4 CSI-RS resource 7

[0107] Table 13-B shows the updated table at time slot k + 4. The base station receives new feedback for report setting 2 including resource indicator CSI-RS resource 3. The base station replaces the original entry for report setting 2 at index 1 (CSI-RS resource 2) with CSI-RS resource 6 included in the latest feedback.

[0108] Table 13-B Example of mapping at time slot k+4

[0109] index Index meaning Resource indicators 0 CRI for Reporting Setting 1 CSI-RS resource 1 1 CRI for reporting setting 2 CSI-RS resource 3 2 CRI for reporting setting 3 CSI-RS Resource 5 3 CRI for Report Setting 4 CSI-RS resource 7

[0110] It is also important that the mapping stored by the base station is the same as the mapping stored by the UE to ensure the correctness of the beam indication. Synchronization of the mapping can be achieved by the base station sending an acknowledgment to the UE to confirm the receipt of the feedback message. For example, the UE sends a feedback message to the base station in response to a reference signal. After the base station successfully receives the feedback message, the base station updates its own mapping and sends an acknowledgment (e.g., ACK) to the UE. The acknowledgment can be sent separately or together with the beam indication message. After the UE receives the acknowledgment, it knows that the base station has successfully received its feedback message and updated the mapping accordingly. The UE can continue to update its own mapping using the same set of rules and criteria as used by the base station. If the feedback message fails to be sent successfully, the base station also sends a message (e.g., NACK) to indicate the transmission failure. The mapping at the base station and the UE remains the same.

[0111] Alternatively, the UE may update its mapping before it sends the feedback message to the base station by using the same set of rules and criteria as used by the base station. However, if the feedback message fails to be successfully sent to the base station, the base station may have a mapping that is different from the mapping stored on the UE. In order to ensure that the base station and the UE have the same mapping for beam indication, a two-step update process may be adopted at the UE. For example, as shown in Table 14-A, after receiving one or more reference signals from the base station, the UE includes CSI-RS resource 8 as a resource indicator for reporting setting 1 in its feedback message. The base station and the UE add CSI-RS resource 8 to the reserved entry for the latest feedback as the first step of the two-step update process, instead of directly updating entry 4 for reporting setting 1 in their mappings.

[0112] Table 14-A Example of mapping at UE before sending feedback

[0113]

[0114]

[0115] If the feedback message is successfully sent to the base station, the base station may send an acknowledgment to confirm receipt of the feedback message. The acknowledgment may be sent separately or included in the beam indication message. For example, the base station uses an additional bit (set to "1") to confirm receipt of the feedback message in the beam indication message. When the UE sees that the base station has successfully received the feedback after receiving the acknowledgment, it updates the mapping again as the second step of the two-step update process to replace the entry with the report setting 1 with the new CRI and clear the entry from the reserved entries. Table 14-B shows an example of mapping at the UE after the UE receives the acknowledgment.

[0116] Table 14-B shows an example of mapping performed at the UE after the UE receives the confirmation.

[0117] index Index meaning Resource Indicator 0 First entry established by RRC CSI-RS resource 1 1 Second entry established by RRC CSI-RS resource 2 2 The third entry established by RRC CSI-RS Resource 5 3 The fourth entry established by RRC CSI-RS resource 7 4 CRI for Reporting Setting 1 CSI-RS resource 8 5 CRI for reporting setting 2 CSI-RS resource 4 6 CRI for Reporting Setting 3 CSI-RS Resource 6 7 reserve

[0118] If the base station does not successfully receive the feedback, it does not know the new CRI. In its next beam indication message (e.g., DCI message), the bit used to confirm the receipt of the feedback is set to "0." Now, after receiving the beam indication message, the UE knows that its feedback was not received correctly. It can choose to keep CSI-RS resource 8 in the reserved entry and resend the same feedback. It can also choose to clear the reserved entry and send a different feedback message.

[0119] Alternatively, the base station can use the index of the reserved entry to confirm the receipt of feedback without using an additional bit. For example, the base station can include "111" (decimal 7) in its beam indication message. The value of "111" has two meanings. The first meaning is to instruct the UE to use the corresponding CSI-RS resource 8 to receive DMRS and data. The second meaning is that the base station has received the latest feedback and updated the mapping accordingly. After receiving the message, the UE understands that the base station has received new feedback. The UE can proceed to the second step of the two-step update process.

[0120] In another example, the base station may implicitly inform the UE whether it has successfully received the feedback. For example, the base station and the UE maintain a mapping as shown in Table 14-C. After the UE sends a feedback message including an indicator for reporting setting 1, a different mapping as shown in Table 14-D may be used. The base station may instruct the UE to use the mapping shown in Table 14-D. By indicating this, the base station implicitly informs the UE that the feedback message has been successfully received. Now, after receiving this implicit confirmation, the UE updates Table 14-C using Table 14-D. Otherwise, the UE maintains the current mapping (e.g., Table 14-C) without any changes. In short, when the UE receives a response from the base station indicating that the feedback message has been successfully sent to the base station, the UE uses its feedback message to update the mapping. Otherwise, the UE does not use its feedback message for mapping.

[0121] Table 14-C Example of mapping at the UE before sending feedback

[0122] index Index meaning indicator 0 First entry established by RRC CSI-RS resource 1 1 Second entry established by RRC CSI-RS resource 2 2 The third entry established by RRC CSI-RS Resource 5 3 The fourth entry established by RRC CSI-RS resource 7 4 CRI for reporting setting 1 (before update) CSI-RS resource 3 5 CRI for reporting setting 2 CSI-RS resource 4 6 CRI for reporting setting 3 CSI-RS Resource 6 7 reserve reserve

[0123] Table 14-D Example of mapping at the UE before sending feedback

[0124]

[0125]

[0126] Thus, it is apparent that a method for facilitating wireless communication is disclosed. Figure 7 As shown in FIG, method 700 includes: at 702, storing associations between multiple values ​​and multiple indicators in a mapping, wherein each association includes a value associated with one or more indicators; at 704, sending or receiving a feedback message from a wireless communication node, wherein the message includes one or more indicators; at 706, selecting an association from the mapping based on the feedback message; and at 708, updating one or more indicators in association with the one or more indicators in the feedback message.

[0127] In some embodiments, the UE and / or base station may update the mapping using an indicator in the feedback message only when the feedback message is triggered by a control signal. In some embodiments, the UE sends an ACK / NACK in response to the control signal. For cases where the base station and UE have different mappings, which may be caused by a transmission failure of the control signal, the control signal may be a high-level signal such as an RRC or MAC-CE signal, rather than a DCI signal.

[0128] In some embodiments, the UE and / or base station may update the mapping using information in the PRACH sent from the UE.

[0129] Time information used to change the reference signal

[0130] In some embodiments, the beam associated with the reference signal may be changed in a periodic or semi-continuous manner. Figure 8A As shown in FIG, in time window 1 (801) of the CSI-RS, beam 1 (802) is used. The beam associated with the CSI-RS is changed to beam 2 (804) in time window 2 (803) of the CSI-RS. In time window 3 (805) of the CSI-RS, the beam is changed again to beam 3 (806). Since the beam associated with the reference signal changes over time, the feedback from the UE becomes time-sensitive. Therefore, it is desirable that the base station specify the timing information related to the reference signal (or its corresponding indicator) when it uses the reference signal to notify the beam of the DMRS / CSI-RS / SRS.

[0131] The base station can establish a quasi-co-location relationship between the CSI-RS reference signal and the DMRS / CSI-RS / SRS. For example, there is a QCL assumption between the reference signals corresponding to CSI-RS port 1 and DMRS. If the base station uses CSI-RS port 1 without any additional timing information to indicate the beam of the DMRS, the beam of the DMRS will be ambiguous because the beams at different time windows of the CSI-RS port 1 are different. Therefore, the base station can use the CRI with time window information to notify the beam of the DMRS. For example, as shown in Table 15, if the base station includes an index value of "0" in one or more of its messages, the UE uses CSI-RS port 1 in time window 4 to receive DMRS and PDSCH. For example, the UE should use the same receive beam used to receive CSI-RS port 1 in time window 4 to receive DMRS and PDSCH.

[0132] Table 15 Example of time window-based mapping

[0133]

[0134] In the example shown in Table 15, the UE can obtain the large properties of the DMRS and the data derived from the large properties of the CSI-RS port 1 of the time window 4. The large properties include one or more of the following properties: delay spread, Doppler spread, Doppler shift, average gain, and average delay. The UE can also obtain the spatial Rx parameters of the DMRS based on the spatial Rx parameters of the CSI-RS port 1 of the time window 4, where the spatial Rx parameters include one or more of the following parameters: AoA, dominant AoA, average AoA, power angular spectrum (PAS) of AoA, average AoD, PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, spatial channel correlation, etc. The UE can also obtain the spatial Rx spatial filter of the DMRS based on the Rx spatial filter of the CSI-RS of the time window 4.

[0135] When the base station configures the CSI-RS resource / CSI-RS resource set / CSI-RS resource setting including the CSI-RS port, the information of the time window of the CSI-RS port can be configured. When the base station configures the measurement setting including the link between the reporting setting and the CSI-RS resource setting (including the CSI-RS port), the information of the time window of the CSI-RS port can also be configured. When the base station configures the link between the reporting setting and the CSI-RS resource setting including the CSI-RS port, the information of the time window of the CSI-RS port can also be configured. When the base station configures the reporting / reporting setting associated with the CSI-RS resource setting including the CSI-RS port, the information of the time window of the CSI-RS port can also be configured. The information of the time window of the CSI-RS port can include one or more of the following parameters: time window boundary, number of OFDM symbols in the time window, and number of CSI-RS periods in the time window. In particular, the number of OFDM symbols can further include the number of OFDM symbols with different subcarrier spacing.

[0136] The time window of the CSI-RS port can be implicitly determined by the parameters of the measurement restriction. For example, the measurement restriction can restrict the UE to measure the channel based on the CSI-RS (or other reference signal) of one specific time window, and report the channel state information obtained on the channel in that time window.

[0137] In some embodiments, the time window boundaries can be determined based on the moment of the report or report setting. For example, the UE sends channel state information for the report setting every 10 time slots. For each instance of the report, there is a corresponding time window, and the channel state information can be obtained from the CSI-RS in the time window. In some embodiments, the time window boundaries can be determined based on the moment of the channel measurement. For example, the UE measures the channel once every 5 time slots, and for each time slot in which the UE measures the channel, there is a corresponding time window (for example, from the last time slot in which the UE measures the channel until the current time slot, so the duration of the corresponding time window is 5 time slots), and the channel state information can be obtained from the CSI-RS in the time window.

[0138] In some embodiments, the base station may establish the boundaries of the CSI-RS time window in each of the time windows by reporting settings or ports associated with the CSI-RS. Figure 8B As shown in FIG, an association may be established between window 1 of CSI-RS and reporting setting 1 (811). Similarly, an association may be established between window 2 of CSI-RS and reporting setting 2 (812), and an association may be established between window 3 of CSI-RS and reporting setting 3 (813). In some embodiments, the boundaries of the time windows are determined based on the reporting instants in the reporting setting associated with the CSI-RS reference signal. Similarly, in some embodiments, the base station may establish the boundaries of the CSI-RS time windows in each of the time windows based on one or more of the following parameters associated with the CSI-RS: for example, measurement setting, measurement, or link.

[0139] In some embodiments, the time window is included in a set of time windows. The set of time windows can be sorted by the end time of each of the time windows in the set of time windows. In some embodiments, the set of time windows includes a first time window located closest to the transmission time of the second reference signal in the time domain. The time interval between the end time of the first window and the transmission time of the second reference signal can be greater than a predetermined threshold. The set of time windows also includes a second time window located farthest from the transmission time of the second reference signal in the time domain. The time interval between the start time of the second time window and the transmission time of the second reference signal can be less than another predetermined threshold to ensure an appropriate distance from the first reference signal (e.g., DMRS).

[0140] Figure 9An example of a wireless communication system is shown in which techniques according to one or more embodiments of the present technology can be applied. The wireless communication system 700 may include one or more base stations (BSs) 905a, 905b, one or more wireless devices 910a, 910b, 910c, 910d, and an access network 925. The base stations 905a, 905b may provide wireless services to the wireless devices 910a, 910b, 910c, and 910d in one or more wireless sectors. In some embodiments, the base stations 905a, 905b include directional antennas to generate two or more directional beams to provide wireless coverage in different sectors.

[0141] The access network 925 can communicate with one or more base stations 905a, 905b. In some embodiments, the access network 925 includes one or more base stations 905a, 905b. In some embodiments, the access network 925 is connected to a core network ( Figure 9 (not shown) communications. The core network may include one or more service subscription databases to store information related to subscribed wireless devices 910a, 910b, 910c, and 910d. The first base station 905a may provide wireless services based on a first radio access technology, while the second base station 905b may provide wireless services based on a second radio access technology. Depending on the deployment scenario, base stations 905a and 905b may be co-located or may be installed separately on-site. The access network 925 may support multiple different radio access technologies.

[0142] In some implementations, a wireless communication system may include multiple networks using different wireless technologies. A dual-mode or multi-mode wireless device includes two or more wireless technologies that can be used to connect to different wireless networks.

[0143] Figure 10 10 is a block diagram representation of a portion of a radio station. A radio station 1005, such as a base station or a wireless device (or UE), may include processor electronics 1010, such as a microprocessor that implements one or more of the wireless technologies presented in this document. The radio station 1005 may include transceiver electronics 1015 to send and / or receive wireless signals via one or more communication interfaces (such as antenna 1020). The radio station 1005 may include other communication interfaces for sending and receiving data. The radio station 1005 may include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some embodiments, the processor electronics 1010 may include at least a portion of the transceiver electronics 1015. In some embodiments, at least some of the disclosed techniques, modules, or functions are implemented using the radio station 1005.

[0144] Figure 11 is a flowchart representation of a wireless communication method 1100. The method 1100 includes, at 1102, receiving a feedback message from a wireless communication node including one or more indicators, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; and, at 1104, sending a control message to the wireless communication node, the control message including a value indicating at least one indicator selected from the one or more indicators. In some embodiments, the resource includes a beam for transmission with the wireless communication node.

[0145] In some embodiments, the value indicates a parameter set. The parameter set includes one or more parameters for at least one indicator. The one or more parameters include timing information, reporting setting parameters, resource setting parameters, resource set parameters, signal quality or channel of a resource, and a sequence number of at least one indicator from a set of indicators of the wireless communication node.

[0146] In some embodiments, the value is associated with one or more attributes of a reference signal, the one or more attributes comprising: timing information, reporting settings, link, measurement settings, resource settings, resource set, resource, channel quality, signal quality, and channel condition. In some embodiments, the value is associated with the order of one or more indicators in the feedback message.

[0147] In some embodiments, the method further comprises obtaining an association between a value in a mapping and at least one indicator selected from the one or more indicators, wherein the mapping comprises a predetermined set of associations between the message-based indicators and the values. In some embodiments, the method further comprises establishing a subset of the predetermined set of associations using advanced signaling.

[0148] In some embodiments, the method further comprises updating the mapping based on a comparison of one or more indicators in the feedback message with indicators stored in the mapping. In some embodiments, the method further comprises updating the mapping using at least one of the one or more indicators in the feedback message when an ACK message for the feedback message is sent to the wireless communication node. In some embodiments, the method further comprises updating the mapping based on a determination that the feedback message satisfies a predetermined set of criteria.

[0149] In some embodiments, the value also indicates a correlation between the reference signal indicated by the indicator and another reference signal.

[0150] Figure 12is another flow chart representation of a wireless communication method 1200. The method 1200 includes, at 1204, sending a feedback message including one or more indicators to a wireless communication node, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; at 1206, receiving a control message including a value indicating at least one indicator selected from the one or more indicators; and, at 1206, performing a transmission using the resources indicated by the indicator based on the value. In some embodiments, the resources include a beam for performing the transmission.

[0151] In some embodiments, the value indicates a parameter set. The parameter set includes one or more parameters for at least one indicator. The one or more parameters include timing information for at least one indicator from a set of indicators of the wireless communication node, parameters for reporting settings, parameters for resource settings, parameters for a resource set index, signal quality or channel of a resource, and a sequence number.

[0152] In some embodiments, the value is associated with one or more attributes of a reference signal, the one or more attributes comprising: timing information, reporting settings, link, measurement settings, resource settings, resource set, resource, channel quality, signal quality, and channel condition. In some embodiments, the value is associated with the order of one or more indicators in the feedback message.

[0153] In some embodiments, the method further comprises obtaining an association between a value in a mapping and at least one indicator selected from the one or more indicators, wherein the mapping comprises a predetermined set of associations between the message-based indicators and the values. In some embodiments, the method further comprises establishing a subset of the predetermined set of associations using advanced signaling.

[0154] In some embodiments, the method further comprises updating the mapping based on a comparison of one or more indicators in the feedback message with indicators stored in the mapping. In some embodiments, the method further comprises updating the mapping using at least one of the one or more indicators in the feedback message when an ACK message for the feedback message is sent to the wireless communication node. In some embodiments, the method further comprises updating the mapping based on a determination that the feedback message satisfies a predetermined set of criteria.

[0155] In some embodiments, the value also indicates a correlation between the reference signal indicated by the indicator and another reference signal.

[0156] Figure 13is another flow chart representation of a wireless communication method 1300. The method 1300 includes, at 1302, receiving a reference signal-based feedback message from a wireless communication node, the feedback message including channel state information of a communication link; and, at 1304, sending a message to the wireless communication node to indicate a reception status of the feedback message.

[0157] In some embodiments, the sending of the message is based on determining that the channel state information satisfies a predetermined set of criteria. In some embodiments, the predetermined set of criteria includes determining that the channel state information includes one or more indicators, the one or more indicators including a reference signal resource indicator, an antenna port indicator, a resource setting indicator, and a relative power indicator. In some embodiments, the predetermined set of criteria includes determining that the feedback message is sent within a predetermined window. In some embodiments, the feedback message includes one or more indicators, each of the one or more indicators indicating a beam corresponding to a reference signal used for data transmission.

[0158] Figure 14 1400 is another flow chart representation of a wireless communication method 1400. The method 1400 includes, at 1402, sending a reference signal-based feedback message to a wireless communication node, the feedback message including channel state information of a communication link; and, at 1404, receiving a message from a wireless communication node indicating a reception status of the feedback message. In some embodiments, the channel state information satisfies a predetermined set of criteria. In some embodiments, the feedback message includes one or more indicators, each of the one or more indicators indicating a beam corresponding to the reference signal used for data transmission.

[0159] Figure 15 is another flow chart representation of a wireless communication method 1500. Method 1500 includes, at 1502, establishing an association between a first reference signal and a second reference signal in a time window; and, at 1504, transmitting or receiving the second reference signal based on the association. In some embodiments, the association is a quasi-co-location relationship between the first reference signal and the second reference signal in the time window. In some implementations, a receiver spatial filter for the first reference signal and a receiver spatial filter for the second reference signal in the time window are the same.

[0160] In some embodiments, the attributes of the time window are configured in at least one parameter set of a plurality of parameter sets, the plurality of parameter sets comprising a parameter set of a measurement setting associated with the first reference signal, a parameter set of a link associated with the first reference signal, a parameter set of a reporting setting associated with the first reference signal, a parameter set of a resource setting including the first reference signal, a parameter set of a resource set including the first reference signal, and a parameter set of a resource including the first reference signal.

[0161] In some embodiments, the time window is configured based on one or more attributes associated with the first reference signal, the one or more attributes including: measurement settings, link, reporting settings, report, resource settings, resource set, and resource. The time window may also be determined based on one or more attributes associated with the first reference signal, the one or more attributes including: measurement settings, link, and reporting settings. In some embodiments, the method further includes determining a boundary of the time window based on a timing of a reporting setting associated with the first reference signal.

[0162] In some embodiments, the time window is included in a set of time windows. In some embodiments, the set of time windows includes a first time window located at a first distance in the time domain from the transmission time of the second reference signal. The time interval between the end time of the first time window and the transmission or reception time of the second reference signal is greater than a predetermined threshold, and the first distance is shorter than the distances of other time windows in the set of time windows from the transmission time of the second reference signal. The set of time windows also includes a second time window located in the time domain at a second distance in the time domain from the transmission time of the second reference signal. The time interval between the start time of the second time window and the transmission or reception time of the second reference signal is less than a predetermined threshold, and the second distance is longer than the distances of other time windows in the set of time windows from the transmission time of the second reference signal.

[0163] In some embodiments, the set of time windows includes a predetermined number of time windows, and the index of each of the time windows is determined by the start time or the end time of the time window.

[0164] In some embodiments, the set of time windows includes a first time window located closest to a transmission time of the second reference signal in the time domain and a second time window located farthest from the transmission time of the second reference signal in the time domain.

[0165] Some embodiments described herein are described in the general context of a method or process, which can be implemented in one embodiment by a computer program product embodied in a computer-readable medium, which includes computer-executable instructions such as program code executed by a computer in a network environment. Computer-readable media may include removable and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), compact discs (CD), digital versatile discs (DVD), etc. Therefore, computer-readable media may include non-transitory storage media. Typically, program modules may include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. Computer or processor executable instructions, associated data structures, and program modules represent examples of program codes for executing the steps of the methods disclosed herein. A specific sequence of such executable instructions or associated data structures represents an example of corresponding actions for implementing the functions described in such steps or processes.

[0166] Using hardware circuit, software or its combination, some disclosed embodiments can be implemented as device or module.For example, hardware circuit implementation can include discrete analog and / or digital components, which are, for example, integrated as a part for a printed circuit board.Alternatively or additionally, disclosed components or modules can be implemented as application specific integrated circuits (ASICs) and / or are implemented as field programmable gate arrays (FPGAs).Some embodiments can additionally or alternatively include a digital signal processor (DSP), which is a special-purpose microprocessor with an optimized architecture for the operation requirements of the digital signal processing associated with the disclosed functions of the present application.Similarly, the various components or subcomponents in each module can be implemented with software, hardware or firmware.Any connection method and medium known in the art can be used to provide the connection between the components in the module and / or the module, including but not limited to communicating via the Internet, wired or wireless networks using appropriate protocols.

[0167] Although this patent document contains many details, these details should not be interpreted as limitations on any invention or the scope of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Certain features described in this patent document in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable subcombination. Moreover, although features may be described above as functioning in certain combinations and even initially claimed as such, in some cases one or more features from the claimed combination may be excised from the combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination.

[0168] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring such an order nor that all illustrated operations be performed, to accomplish desirable results. Additionally, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments.

[0169] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this patent document.

Claims

1. A wireless communication method, applied to a base station, comprising: receiving a feedback message from a terminal including one or more indicators, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; Obtaining a bit field value in a mapping, wherein a mapping relationship exists between the bit field value and at least one indicator selected from the one or more indicators, wherein the mapping comprises a set of mappings between the one or more indicators and a set of bit field values, wherein the set of bit field values ​​comprises one or more bit field values, wherein the bit field value indicates a parameter set, wherein the parameter set comprises one or more parameters for the at least one indicator; and A control message for data transmission is sent to the terminal, the control message including the one bit field value, wherein the one bit field value has the mapping relationship with the at least one selected indicator, and the control message is used by the terminal to obtain relevant parameters of the data according to the reference signal corresponding to the at least one selected indicator.

2. The method according to claim 1, wherein The one or more parameters include timing information of at least one indicator in a set of indicators from the terminal, parameters of a reporting setting, parameters of a resource setting, parameters of a resource set, signal quality or channel of a resource, and a sequence number. 3 . The method of claim 1 , further comprising establishing a subset of the predetermined association set using advanced signaling.

4. The method according to claim 1, further comprising: The mapping is updated based on a comparison of one or more indicators in the feedback message with indicators stored in the mapping.

5. The method according to any one of claims 1 to 4, characterized in that The control message is used by the terminal to obtain relevant parameters of the data according to the reference signal corresponding to the selected at least one indicator, including: The control message is used by the terminal to obtain at least one of the following properties of the demodulation reference signal of the data according to the reference signal corresponding to the selected at least one indicator: Delay spread, Doppler spread, Doppler shift, average delay.

6. The method according to claim 1, further comprising: establishing a correlation between the first reference signal and the second reference signal in the time window; and The second reference signal is transmitted or received based on an association between the first reference signal and the second reference signal, wherein the value indicates the association between the first reference signal and the second reference signal indicated by the indicator.

7. The method according to claim 6, wherein: The attributes of the time window are configured in at least one parameter set of a plurality of parameter sets, the plurality of parameter sets comprising: a parameter set of a measurement setting associated with the first reference signal, a parameter set of a link associated with the first reference signal, a parameter set of a reporting setting associated with the first reference signal, a parameter set of a resource setting including the first reference signal, a parameter set of a resource set including the first reference signal, and a parameter set of a resource including the first reference signal.

8. The method of claim 6, further comprising determining a boundary of the time window based on a timing of a reporting setting associated with the first reference signal.

9. The method according to claim 7, wherein: The time window is included in a set of time windows.

10. The method according to claim 9, wherein: The set of time windows includes a first time window located at a first distance from the transmission time of the second reference signal in the time domain, the time interval between the end time of the first time window and the sending or receiving time of the second reference signal is greater than a predetermined threshold, and the first distance is shorter than the distances of other time windows in the set of time windows from the transmission time of the second reference signal.

11. The method according to claim 9, wherein The set of time windows includes a second time window located at a second distance in the time domain from the transmission time of the second reference signal, the time interval between the start time of the second time window and the sending or receiving time of the second reference signal is less than a predetermined threshold, and the second distance is longer than the distances of other time windows in the set of time windows from the transmission time of the second reference signal.

12. The method according to claim 9, wherein The set of time windows includes a predetermined number of time windows, wherein an index of each of the time windows is determined by a start time or an end time of the time window.

13. The method according to claim 6, wherein: The association between the first reference signal and the second reference signal is a quasi co-location relationship.

14. A wireless communication method, applied to a terminal, comprising: sending a feedback message including one or more indicators to a base station, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; receiving a control message for data transmission, the control message including a bit field value, wherein the bit field value is mapped to at least one indicator selected by the base station; obtaining the one bit field value in a mapping, wherein a mapping relationship exists between the one bit field value and at least one indicator selected from the one or more indicators, wherein the mapping comprises a set of mappings between the one or more indicators and a set of bit field values, wherein the set of bit field values ​​comprises one or more bit field values, wherein the bit field value indicates a parameter set, wherein the parameter set comprises one or more parameters for the at least one indicator; and Based on the reference signal corresponding to the selected at least one indicator, a parameter related to the data is obtained.

15. The method according to claim 14, wherein The one or more parameters include timing information of at least one indicator in a set of indicators from the base station, parameters of reporting settings, parameters of resource settings, parameters of resource set index, signal quality or channel of a resource, and a sequence number.

16. The method of claim 14, further comprising using high-level signaling to establish a subset of the predetermined association set.

17. The method according to claim 14, further comprising: The mapping is updated based on a comparison of one or more indicators in the feedback message with indicators stored in the mapping.

18. The method according to any one of claims 14 to 17, characterized in that Obtaining parameters related to the data based on the reference signal corresponding to the selected at least one indicator includes: The terminal obtains, according to the reference signal corresponding to the selected at least one indicator, at least one of the following properties of a demodulation reference signal of the data: Delay spread, Doppler spread, Doppler shift, average delay.

19. The method according to claim 14, further comprising: establishing a correlation between the first reference signal and the second reference signal in the time window; and The second reference signal is transmitted or received based on a correlation between the first reference signal and the second reference signal, the value indicating the correlation between the first reference signal and the second reference signal indicated by the indicator.

20. The method according to claim 19, wherein The attributes of the time window are configured in at least one parameter set of a plurality of parameter sets, the plurality of parameter sets comprising: a parameter set of a measurement setting associated with the first reference signal, a parameter set of a link associated with the first reference signal, a parameter set of a reporting setting associated with the first reference signal, a parameter set of a resource setting including the first reference signal, a parameter set of a resource set including the first reference signal, and a parameter set of a resource including the first reference signal.

21. The method of claim 19, further comprising determining a boundary of the time window based on a timing of a reporting setting associated with the first reference signal.

22. The method according to claim 20, wherein The time window is included in a set of time windows.

23. The method according to claim 22, wherein The set of time windows includes a first time window located at a first distance from the transmission time of the second reference signal in the time domain, the time interval between the end time of the first time window and the sending or receiving time of the second reference signal is greater than a predetermined threshold, and the first distance is shorter than the distances of other time windows in the set of time windows from the transmission time of the second reference signal.

24. The method according to claim 22, wherein The set of time windows includes a second time window located at a second distance in the time domain from the transmission time of the second reference signal, the time interval between the start time of the second time window and the sending or receiving time of the second reference signal is less than a predetermined threshold, and the second distance is longer than the distances of other time windows in the set of time windows from the transmission time of the second reference signal.

25. The method according to claim 22, wherein The set of time windows includes a predetermined number of time windows, wherein an index of each of the time windows is determined by a start time or an end time of the time window.

26. The method according to claim 19, wherein The association between the first reference signal and the second reference signal is a quasi co-location relationship.

27. A wireless communication method, applied to a base station, comprising: receiving a feedback message based on one or more indicators of a reference signal sent by a terminal, wherein each of the one or more indicators indicates a resource corresponding to the reference signal, and the feedback message includes channel state information of a communication link; updating the mapping based on a comparison of the one or more indicators in the feedback message with indicators stored in a mapping, the mapping comprising a set of mappings between the one or more indicators and a set of bit field values, wherein the set of bit field values ​​comprises one or more bit field values, wherein the bit field values ​​indicate a parameter set, the parameter set comprising one or more parameters for at least one indicator; sending a response message to the terminal, the response message indicating successful receipt of the feedback message; and A control message for acquiring parameters for data transmission is sent to the terminal, wherein the control message includes a bit field value, wherein the bit field value has the mapping relationship with the selected at least one indicator.

28. The method according to claim 27, wherein The sending of the response message is based on determining that the channel state information satisfies a predetermined set of criteria.

29. The method according to claim 28, wherein The predetermined set of criteria includes determining that the channel state information includes one or more indicators, the one or more indicators including a reference signal resource indicator, an antenna port indicator, a resource setting indicator, and a relative power indicator.

30. The method of claim 28, wherein The predetermined set of criteria includes: determining to send the feedback message within a predetermined time window.

31. A wireless communication method, applied to a terminal, comprising: receiving a reference signal; Obtaining a feedback message of one or more indicators based on the received reference signal, wherein each of the one or more indicators indicates a resource corresponding to the reference signal, and the feedback message includes channel state information of the communication link; Sending the feedback message to a base station; receiving a response message sent by the base station; Determining successful receipt of the feedback message according to the received response message; updating the mapping based on a comparison of the one or more indicators in the feedback message with indicators stored in a mapping, the mapping comprising a set of mappings between the one or more indicators and a set of bit field values, wherein the set of bit field values ​​comprises one or more bit field values, wherein the bit field values ​​indicate a parameter set, the parameter set comprising one or more parameters for at least one indicator; and A control message for acquiring parameters for data transmission is received, where the control message includes a bit field value, wherein the bit field value has the mapping relationship with at least one indicator selected by the base station.

32. The method according to claim 31, wherein The sending of the response message is based on determining that the channel state information satisfies a predetermined set of criteria.

33. The method according to claim 32, wherein The predetermined set of criteria includes determining that the channel state information includes one or more indicators, the one or more indicators including a reference signal resource indicator, an antenna port indicator, a resource setting indicator, and a relative power indicator.

34. The method of claim 32, wherein: The predetermined set of criteria includes: determining to send the feedback message within a predetermined time window.

35. A wireless communication device comprising: processor, and a memory storing instructions executable by the processor, Wherein, when the instructions are executed by the processor, the processor is configured to perform the steps of any one of claims 1 to 34.

36. A non-transitory computer-readable medium having stored thereon computer-executable instructions for performing the method of any one of claims 1 to 34.

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