Transmission of control messages in wireless communications
阅读说明：本技术 无线通信中控制消息的传输 (Transmission of control messages in wireless communications ) 是由 张淑娟 鲁照华 李儒岳 高波 陈艺戬 蒋创新 于 2017-06-23 设计创作，主要内容包括：描述了用于在无线通信中实施波束指示的方法、系统和装置。在一个示例性方面,公开了一种无线通信方法。该方法包括：接收来自无线通信节点的包括一个或多个指示符的反馈消息,其中一个或多个指示符中的每个指示与参考信号相对应的资源；并且将包括指示从一个或多个指示符中选出的至少一个指示符的值的消息发送到无线通信节点。(Methods, systems, and apparatuses for implementing beam indication in wireless communications are described. In one exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: receiving a feedback message from a wireless communication node comprising one or more indicators, wherein 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 indicating at least one indicator selected from the one or more indicators.)
1. A method of wireless communication, comprising:
receiving a feedback message from a wireless communication node comprising one or more indicators, wherein each indicator of the one or more indicators indicates a resource corresponding to a reference signal; and is
Transmitting a control message to the wireless communication node, the control message comprising a value indicating at least one indicator selected from the one or more indicators.
2. The method of claim 1, wherein the value indicates a parameter set comprising one or more parameters for the at least one indicator.
3. The method of claim 2, wherein the one or more parameters comprise timing information of at least one indicator from the set of indicators for the wireless communication node, parameters for report settings, parameters for resource settings, parameters for a set of resources, signal quality or channel for a resource, and sequence number.
4. The method of claim 1, further comprising:
an association between the value in a mapping and at least one indicator selected from one or more indicators is obtained, wherein the mapping includes a predetermined set of associations between message-based indicators and values.
5. The method of claim 2, further comprising establishing a subset of the predetermined association set using high level signaling.
6. The method of claim 2, further comprising:
updating the mapping based on a comparison of one or more indicators in the feedback message to indicators stored in the mapping.
7. The method of claim 1, wherein the value indicates an association between a reference signal indicated by the indicator and another reference signal.
8. A method of wireless communication, comprising:
transmitting a feedback message comprising one or more indicators to a wireless communication node, wherein each indicator 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 is
Based on the value, performing a transmission using the resource indicated by the indicator.
9. The method of claim 8, wherein the value indicates a parameter set comprising one or more parameters for the at least one indicator.
10. The method of claim 9, wherein the one or more parameters comprise timing information of at least one indicator from the set of indicators for the wireless communication node, parameters for report settings, parameters for resource set indices, signal quality or channel for resources, and sequence numbers.
11. The method of claim 8, further comprising:
an association between the value in a mapping and at least one indicator selected from one or more indicators is obtained, wherein the mapping includes a predetermined set of associations between message-based indicators and values.
12. The method of claim 11, further comprising establishing a subset of the predetermined association set using high level signaling.
13. The method of claim 11, further comprising:
updating the mapping based on a comparison of one or more indicators in the feedback message to indicators stored in the mapping.
14. The method of claim 8, the value indicating an association between a reference signal indicated by the indicator and another reference signal.
15. A method of wireless communication, comprising:
receiving a reference signal based feedback message from a wireless communication node, the feedback message comprising channel state information of a communication link; and is
Transmitting a message to the wireless communication node to indicate a receipt status of the feedback message.
16. The method of claim 15, wherein the sending of the message is based on determining that the channel state information satisfies a predetermined set of criteria.
17. The method of claim 16, wherein the predetermined set of criteria comprises determining that the channel state information comprises one or more indicators comprising a reference signal resource indicator, an antenna port indicator, a resource setting indicator, and a relative power indicator.
18. The method of claim 16, wherein the predetermined set of criteria comprises: it is determined that the feedback message is sent in a predetermined time window.
19. A method of wireless communication, comprising:
establishing an association between a first reference signal and a second reference signal in a time window; and is
Transmitting or receiving the second reference signal based on the association.
20. The method of 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 set of parameters for a measurement setting associated with the first reference signal, a set of parameters for a link associated with the first reference signal, a set of parameters for a reporting setting associated with the first reference signal, a set of parameters for a resource setting including the first reference signal, a set of parameters for a resource set including the first reference signal, and a set of parameters for 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 time instant of a reporting setting associated with the first reference signal.
22. The method of claim 20, wherein the time windows are contained in a set of time windows.
23. The method of claim 22, wherein the set of time windows comprises a first time window positioned at a first distance in the time domain from a transmission time of the second reference signal, a time interval between an end time of the first time window and a transmission or reception time of the second reference signal is greater than a predetermined threshold, and the first distance is shorter than distances of other time windows in the set of time windows from the transmission time of the second reference signal.
24. The method of claim 22, wherein the set of time windows comprises a second time window positioned at a second distance in the time domain from a transmission time of the second reference signal in the time domain, a time interval between a start time of the second time window and a transmission or reception time of the second reference signal is less than a predetermined threshold, and the second distance is longer than distances of other time windows in the set of time windows from the transmission time of the second reference signal.
25. The method of claim 22, wherein the set of time windows comprises a predetermined number of time windows, wherein the index of each of the time windows is determined by a start time or an end time of the time window.
26. The method of claim 19, wherein the association is a quasi co-location relationship.
27. A wireless communication device configured to perform the steps of any of claims 1-26.
28. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the method of any of claims 1-26.
Technical Field
This patent document relates generally to wireless communications.
Background
Mobile communication technology is pushing the world to an increasingly connected and networked society. Next generation systems and wireless communication technologies will need to support a wider range of use case characteristics and provide a more sophisticated range of network access technologies than existing wireless networks.
Disclosure of Invention
This patent document relates to techniques, systems, and apparatus for beam indication in wireless communications.
In one exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: receiving a feedback message from a wireless communication node comprising one or more indicators, wherein each of the one or more indicators indicates a resource corresponding to a reference signal; and transmitting 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 another exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: transmitting a feedback message comprising 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; based on the value, transmission is performed using the resource indicated by the indicator.
In another exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: receiving a reference signal based feedback message from a wireless communication node, the feedback message comprising channel state information of a communication link; and sending a message to the wireless communication node to indicate a receipt status of the feedback message.
In another exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: transmitting a feedback message including the resource information to the wireless communication node; and receives a message from the wireless communication node. The message indicates a reception status of the feedback message.
In yet another exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: establishing an association between a first reference signal and a second reference signal in a time window; transmitting or receiving the second reference signal based on the association.
The above and other aspects and embodiments thereof are described in more detail in the accompanying drawings, the description and the claims.
Drawings
Fig. 1 shows an example of a multiple-input multiple-output (MIMO) system including m transmit antennas and n receive antennas.
Fig. 2 illustrates an example of beamforming to improve carrier-to-noise-and-interference-and-noise ratio (CINR) by matching antenna gain to a specific User Entity (UE) location.
Fig. 3 shows an example of beam indication performed by a base station.
Fig. 4 shows an example in which a base station transmits three channel state information reference signals (CSI-RS) to a user entity and receives corresponding feedback from the user entity.
Fig. 5A shows an example in which the base station sends acknowledgement messages only for the two most recent feedback messages from the UE.
Fig. 5B shows an example of the timing of the feedback message.
Fig. 6A shows an example of a long delay from the time when the UE transmits its feedback to the time when the base station transmits a Downlink Control Indicator (DCI) message for beam indication when mapping is established via Radio Resource Control (RRC).
Fig. 6B shows an example of a short delay from the time the UE sends its feedback to the time the base station sends a DCI message for beam indication when mapping is established via DCI.
Fig. 7 is a flowchart representation of a method of wireless communication.
Fig. 8A shows an example of reference signals with different beams in different time windows.
Fig. 8B illustrates an example of a window of a channel state information reference signal (CSI-RS) associated with a report setting or report.
Fig. 9 is an example of a wireless communication system in which techniques in accordance with one or more embodiments of the present technology may be applied.
Fig. 10 is a block diagram representation of a portion of a radio station.
Fig. 11 is a flowchart representation of a method of wireless communication.
Fig. 12 is another flow chart representation of a method of wireless communication.
Fig. 13 is another flow chart representation of a method of wireless communication.
Fig. 14 is another flowchart representation of a method of wireless communication.
Fig. 15 is another flow chart representation of a method of wireless communication.
Detailed Description
The rapid growth of wireless communications and advances in technology have partially met the demand for greater capacity and higher data rates. Other aspects such as energy consumption, device cost, spectrum resource allocation and latency are also factors in future network success.
Multiple Input Multiple Output (MIMO) is a method of multiplying the capacity of a radio link using multipath propagation using multiple transmit and receive antennas. Fig. 1 shows an example of a MIMO system comprising m transmit antennas 101-1, 101-2, a. The
Under MIMO, the transmitter and receiver may perform beamforming before or during data transmission. Fig. 2 illustrates an example of beamforming to improve carrier-to-noise-and-interference-and-noise ratio (CINR) by matching antenna gain to a specific UE location. For example, beamforming allows base station gNB 1201 to modify its transmit signal to give the best CINR at the output of the channel in the direction of UE 1203. Similarly, the base station gNB 2202 can modify its transmit signal by performing beamforming to give the best CINR at the output of the channel in the direction of the UE 2204.
Fig. 3 shows an example of beam indication performed by a base station. In fig. 3, base station gNB301 has twelve beams for transmission. The UE 303 has nine beams for reception. Base station gNB301 transmits one or more CSI-RS antenna ports and/or CSI-RS resources to UE 303 to determine which beams it may use for subsequent transmissions with UE 303. Each port or each resource may correspond to a particular beam. In this particular example, base station gNB301 transmits twelve coded CSI-RS resources 305-0, 305-1, 305-11 representing twelve beams to
As shown in fig. 3, when there are multiple beams between the transmitting end and the receiving end, it is desirable for the base station to indicate to the UE which beam it will use for subsequent transmissions so that the UE can select one or more appropriate receive antenna ports. The base station may inform the UE to transmit to the UE by including a CSI-RS resource indicator (CRI) in the DCI message. However, when a base station has a large number of available beams, directly indicating multiple CRIs in DCI increases signaling overhead between the base station and the corresponding UE. Accordingly, there remains a need for improved techniques to facilitate more efficient beam indication between a base station and a corresponding UE. This patent document describes the following techniques: the base station is allowed to indicate beam usage using a small number of bits contained in the control message, thereby minimizing the impact of beam indication on signaling overhead. The techniques disclosed herein also allow a base station to inform UEs about reference signals, such as a CSI-RS that is quasi-co-located (quasi-co-located) with the DMRS ports/CSI-RS/SRS ports. The UE may then use the reference signal to derive a large-scale (large-scale) property of the channel of the DMRS/CSI-RS/SRS.
SUMMARY
As previously discussed, the base station may perform beamforming with multiple UEs before or during data transmission. A base station or transmit antennas physically located on different base stations may transmit one or more reference signals corresponding to multiple antenna ports to a particular UE. In some embodiments, the base station may transmit UE-specific reference signals. The use of UE-specific reference signals improves the carrier-to-noise-and-interference-plus-noise ratio (CINR) by matching antenna gain to a specific UE location. For example, the reference signal may be a CSI-RS comprising up to 16 antenna ports, or other types of downlink RSs. Fig. 4 shows an example in which a
Once the
the CRI in the resource setting is the index of the resource level in the resource setting + the number of resources in the resource set + the CRI of the resources in the resource set.
The CRI may also be a logical index of a resource in the resource set, and the resource set may select a resource from the resource set.
In some embodiments, the CRI included in the feedback has an association with one or more DMRS antenna ports. In the example shown in fig. 4, after determining that a beam corresponding to CS-
After the
For example, as shown in table 1, a mapping between index values and CSI-RS resource indicators may be established. The base station may simply include the index value of the indicator in the message for data transmission. The base station may also include an index value in the message for the next phase of channel measurement.
Table 1 example of mapping between index values and indicators
In the example shown in table 1, each of the CSI-RS resource indicators corresponds to an antenna port. The base station may essentially use two bits to indicate which antenna port to use for subsequent transmissions. When the index value is '0' and the index value is included in the message for data transmission, the UE may receive the DMRS and data using a reception beam obtained from a reception beam of the CSI-
In some embodiments, after the UE and the base station receive the 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 information of the indicator in the feedback message with information of the indicator stored in the map. If the UE and/or base station finds that the information is the same, it may replace the corresponding indicator stored in the map 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 reporting 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 comprising the resource indicated by the indicator, an index of a resource set comprising the resource indicated by the indicator, an index of a resource comprising 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 set of indicators, 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 discovers that there is an indicator associated with report 1 (such as CRI1), and it receives a feedback message that includes an indicator for report 1 (such as CRI6), and then the UE and/or base station can replace the indicator in the map (such as CRI1) with the indicator in the new feedback message (such as CRI 6).
For example, CSI-RS1 is a non-precoded reference signal corresponding to multiple antenna ports. The base station may refine CSI-RS1 to the collection of CRIs by configuring that there is a QCL hypothesis between CSI-RS1 and CSI-RS 1-j,
Table 2 example of updating mapping between index values and indicators
Indexing
Indicator symbol
0
CSI-RS resources 1-2
1
CSI-
2
CSI-
3
CSI-RS resource 7
In some embodiments, the base station may choose to send a response when it receives channel state information from the UE in order to inform the UE whether it successfully received the feedback. The base station can send a response only if the feedback meets a predetermined set of criteria. For example, the base station sends a response only if the feedback includes an indicator such as one or more of the following: a CSI-RS port indicator, a CSI-RS resource indicator, a resource set indicator, a resource setting indicator, a time window indicator, or an RPI (relative power indicator). In some embodiments, the metric limit information may be used to obtain a time window indicator. If the feedback message includes only information such as PMI, CQI, or RI, the base station may keep silent without sending a response. The base station may further check the value of the indicator to decide whether it should send a response. For example, the base station transmits a response only when the RPI vector includes zero elements, or only when the RPI vector includes elements having a value smaller than a predetermined threshold. If the base station finds that the RPI vector does not include zero elements, or that it includes all elements whose values are greater than a predetermined threshold, the base station may choose not to send a response for the feedback message. The UE may update the mapping with the indicator in the feedback message only when the UE receives a response and the response means that the base station has successfully received the feedback message. In some embodiments, the UE may perform other actions based on the response.
In some embodiments, the base station may receive a large number of feedback messages from the UE. In order to minimize 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. Fig. 5A shows an example where the base station sends a
Defining the meaning of a mapping
When the base station receives a small amount 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 a corresponding UE sends a large amount of feedback (e.g., in a CoMP scenario), it is desirable to assign meaning to the index values to facilitate maintenance of the mapping at both the base station and the UE. Further, based on the complexity of the feedback message, one or more mappings may be stored, each of which accommodates a type of association between the index value and the resource indicator.
In some embodiments, the index value may simply indicate an indicator with timing information. For example, the index value may correspond to a transmission or reception time of the indicator. Table 3 shows an example of a mapping ordered by the time of receipt of the indicator. In this example, the most recently received indicator (e.g., the last slot) is placed at index 0, while the oldest indicator (e.g., the fourth to last slot) is placed at
Table 3 example of mapping by time ordering of receipt of feedback messages
Indexing
Index meaning
Indicator symbol
0
Receiving CRI at last time slot
CSI-
1
CRI reception at the penultimate slot
CSI-
2
CRI reception at the third last slot
CSI-
3
CRI reception at the fourth last slot
CSI-RS resource 7
As shown in fig. 5B, both the base station and the UE may obtain table 4 based on the criteria given by table 3. The last feedback message is received in time slot n1, which message comprises information of the set that meets the predetermined criterion. Its corresponding indicator is placed at index 0. Similarly, the penultimate eligible feedback message is received in time slot n2 with its corresponding indicator placed at
Table 4 another example of a mapping ordered by the time of receipt of feedback messages
Although the index values in the above example are ordered by the time of receipt of the feedback message, it should be understood that other types of mappings based on timing information may 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 tables 3-4. The rule may also be communicated between the base station and the UE using a message, such as a higher layer control message, prior to time slot n4 or prior to time slot n, where the base station sends the DCI including the index value.
In some embodiments, the index value may indicate an indicator for reporting settings. Table 5 shows an example of a mapping in which index values correspond to indicators of various report settings. The base station and the UE may use predetermined rules and/or use messages to establish a mapping of index values and index meanings. For example, when the feedback indicator of the UE indicates CSI-
Table 5 mapping example where index value means report setting
Indexing
Index meaning
Resource indicator
0
CRI for
CSI-
1
CRI for
CSI-
2
CRI for
CSI-
3
CRI for reporting settings 4
CSI-RS resource 7
In some embodiments, the index value may 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 values and index meanings 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 CRIs corresponding to { CSI-
Table 6 example of index value mapping with respect to channel quality
Indexing
Index meaning
Indicator symbol
0
CRI with optimal channel quality
CSI-
1
CRI with second best channel quality
CSI-
2
CRI with third best channel quality
CSI-
3
CRI with fourth best channel quality
CSI-RS resource 7
The index value may also have a compound meaning. For example, in some cases, a feedback message may include one or more resource indicators. The index value may indicate not only the transmission/reception time of the indicator but also the order of the indicators in the feedback message.
Table 7 shows an example of mapping in which index values show the order of CRI included in the feedback message and the reception time of the indicator. The UE and the base station establish a mapping between index values and corresponding meanings as shown in table 7. The order of the slots is determined by the time domain gap between the slot of the feedback message including the CRI and the slot of the DCI message including the index value. For example, feedback message a includes three CRI: { CSI-
Table 7 example of mapping in which index values indicate order of CRI
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 may 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 values may also have a composite meaning to allow the communication node to more efficiently manage the association between the resource indicators and the beams/antenna ports.
In some embodiments, the index value may be understood as an indicator of the parameter set. The parameter set comprises information about the indicator or the feedback message. This information may be used to distinguish one indicator among many indicator feedbacks by the UE in order to facilitate maintenance of the mapping. The information includes one or more of the following: timing information of a resource indicated by the indicator, timing information of a feedback message comprising the indicator, an index of a reporting 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 comprising the resource indicated by the indicator, an index of a resource set comprising the resource indicated by the indicator, an index of a resource comprising the resource indicated by the indicator, signal quality information and/or a channel of the resource indicated by the indicator, a sequence number of the indicator in the set of indicators. The above information for the indicator may be configured by the base station when the base station configuration mapping or obtained using a predetermined rule. The UE may retrieve the indicator indicated by the index value based on the information. In particular, in the above examples shown in tables 3-7, the mapping between index values and indicators is established based on CRI. However, it should be understood that the mapping between the index values and the indicators may also be established by both the CRI and reference signals such as DMRS/CSI-RS/SRS, which are 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-located relationship with the DMRS. The CSI-RS resources and/or CSI-RS ports indicated by the indicator may also have a quasi co-located relationship with the CSI-RS/SRS when the value index is in the message for triggering the CSI-RS/SRS for the next phase of channel measurement. In some embodiments, the composite meaning of the index is changed from table 6 to table 8, as shown below.
Table 8 another example of mapping of index values associated with channel quality
In the particular example shown in table 8, if the CRI with the best quality is the CRI3 corresponding to CSI-
In some embodiments, the UE may retrieve spatial Rx parameters including one or more of the following parameters: AoA, main AoA, average AoA, AoA Power Angle Spectrum (PAS), average AoD, AoD PAS, transmit/receive channel correlation, transmit/receive beamforming, spatial channel correlation, and the like. In some embodiments, the index value further indicates an 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 derive a spatial Rx spatial filter for the DMRS based on the Rx spatial filter for the CSI-RS. The association may also be with respect to the Rx spatial filter of the CSI-RS and the Tx spatial filter of the uplink SRS/DMRS indicated by the indicator. The UE may derive the spatial Tx spatial filter of the SRS/DMRS for the uplink based on the Rx spatial filter of the CSI-RS.
Minimizing delay
In some embodiments, the mapping of index values and corresponding resource indicators may be established via high level signaling such as Radio Resource Control (RRC). Table 9 shows an example of mapping established via RRC. The examples shown in tables 1-8 may also be established via RRC messages.
Table 9 example of mapping established via RRC
Indexing
Index meaning
Indicator symbol
0
First entry established by RRC
CSI-
1
Second entry established by RRC
CSI-
2
Third entry established by RRC
CSI-
3
Fourth entry established by RRC
CSI-RS resource 4
4
Fifth entry established by RRC
CSI-
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
However, establishing the mapping using high level signaling such as RRC may not be very efficient and may introduce additional delay. For example, as shown in fig. 6A, a delay 601 from the time when the UE transmits its feedback to the time when the base station transmits a DCI message for beam indication is long. To reduce this delay 601, a large mapping may be established via RRC. But do notThat is, a large mapping may increase the overhead of DCI messaging. For example, the mapping may include a total of N CSI-RS resources for beam selection. To efficiently indicate N resources in the mapping, a DCI message needs to include
Alternatively, the mapping may be established via DCI message exchange. Table 10 shows an exemplary mapping established via DCI messaging. The examples shown in tables 1-8 may also be established via DCI messaging. As shown in fig. 6B, the delay 603 between the feedback from the base station and the DCI message is shorter. DCI overhead may 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 less 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 an index value for the beam indication. The number of beams selected by the UE is typically no greater than 8. Thus, only 3 bits are needed to indicate the corresponding beam in the index value.
Table 10 example of mapping established via DCI
Indexing
Index meaning
Resource indicator
0
First entry established by DCI
CSI-
1
Second entry established by DCI
CSI-
2
Third entry established by DCI
CSI-
3
Fourth item established by DCI
CSI-RS resource 7
Handling transmission failures
Sometimes, feedback from the 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 transmissions. In some embodiments, the base station may want to indicate a different beam/antenna port than included in the feedback from the UE. Thus, it is desirable for a base station and corresponding UE to include a subset of associations between index values, and an indicator of resources may be established without UE feedback, and another subset of associations established with 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 a high level control message.
In some embodiments, the base station sends information to the UE to indicate whether the mapping may include at least one association between an indicator and an index value in the feedback message.
When the base station does not receive feedback from the UE, the subset of associations established without UE feedback allows the base station to fall back onto the set of beams/antenna ports. The subset also allows the base station to make alternative selections beyond those provided by the UE feedback.
In some embodiments, a subset of the associations established without UE feedback may be kept in one mapping with other entries with UE feedback, such as shown in table 11. In some embodiments, the subset may also be placed in a separate map. The subset of index values indicating the association established by the RRC and/or UE feedback messages may be configured by the control signal. For example, the control signals 0-4 index set for the association established by RRC, as shown in Table 11.
Table 11 includes an example of a mapping of default entries
Indexing
Index meaning
Indicator symbol
0
First entry established by RRC
CSI-
1
Second entry established by RRC
CSI-
2
Third entry established by RRC
CSI-
3
Fourth entry established by RRC
CSI-RS resource 7
4
First included in UE feedbackA CRI
CSI-
5
Second CRI included in UE feedback
CSI-RS resources 4-6
6
Third CRI included in UE feedback
CSI-RS resource 6
7
Retention
Retention
Updating a mapping
When the base station and the 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 keep only relevant information from the most recent feedback messages, thereby reducing the amount of information stored in the map.
One or more mappings may be updated based on one or more meanings of the index values. For example, in some embodiments, the base station and the UE may simply update the mapping based on the time information. The mapping may be updated in a "first-in-first-out" manner. Tables 12-A through 12-C illustrate examples of updating the mapping based on the time of receipt of the indicator. Table 12-a shows an example of a mapping stored by a base station and corresponding UE at slot k + 3. The mapping is limited to four entries so that the base station can indicate which beam/antenna port is to use two bits.
Table 12-example of mapping at slot k +3
Indexing
Index meaning
Indicator symbol
0
CRI received at last slot (e.g., slot k +3)
CSI-
1
CRI received at the penultimate slot (e.g., slot k +2)
CSI-
2
CRI received at the third last slot (e.g., slot k +1)
CSI-
3
CRI received at the fourth to last slot (e.g., slot k)
CSI-RS resource 7
Table 12-B shows the updated table at slot k + 4. The base station receives new feedback at slot k +4, which includes 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 most recent feedback and pushes the other CRIs stored in the mapping as shown in table 12-B.
Table 12-example of mapping at slot k +4
Indexing
Index meaning
Indicator symbol
0
CRI received at last slot (e.g., slot k +4)
CSI-RS resource 6
1
CRI received at the penultimate slot (e.g., slot k +3)
CSI-
2
CRI received at the third last slot (e.g., slot k +2)
CSI-
3
CRI received at the fourth to last slot (e.g., slot k +1)
CSI-
Alternatively, the entries may also be rearranged, such as shown in table 12-C, so that the index values correspond to the chronological order in which the feedback messages were received. In some cases, the base station may check the existing indicator to see if the indicator included in the feedback message has been added to its map. If so, the base station may skip updating the mapping.
Another example of mapping of Table 12-C at slot k +4
Indexing
Index meaning
Indicator symbol
0
CRI received at slot k +1
CSI-
1
CRI received at slot k +2
CSI-
2
CRI received at slot k +3
CSI-
3
CRI received at slot k +4
CSI-RS resource 6
In some embodiments, the base station and the UE may update the mapping based on the reporting settings included in the feedback. Tables 13-A through 13-B illustrate examples of updating the mapping based on the report settings. Table 13-a shows an example of a mapping stored by a base station and corresponding UE at slot k + 3. The mapping is limited to four entries, each corresponding to a different reporting setting.
Example of mapping at slot k +3 of Table 13-A
Indexing
Index meaning
Resource indicator
0
CRI for
CSI-
1
CRI for
CSI-
2
CRI for
CSI-
3
CRI for reporting settings 4
CSI-RS resource 7
Table 13-B shows the updated table at slot k + 4. The base station receives new feedback for report setting 2 including resource indicator CSI-
Example of mapping at slot k +4 of Table 13-B
Indexing
Index meaning
Resource indicator
0
CRI for
CSI-
1
CRI for
CSI-
2
CRI for
CSI-
3
CRI for reporting settings 4
CSI-RS resource 7
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 may be achieved by the base station sending an acknowledgement to the UE to acknowledge receipt of the feedback message. For example, the UE sends a feedback message to the base station as a response to the reference signal. After the base station successfully receives the feedback message, the base station updates its own mapping and sends an acknowledgement (e.g., ACK) to the UE. The acknowledgements may be sent separately or together with the beam indication message. After the UE receives the acknowledgement, it knows that the base station has successfully received its feedback message and updates the mapping accordingly. The UE may 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 successfully sent, the base station also sends a message (e.g., a NACK) to indicate a transmission failure. The mapping at the base station and the UE remains the same.
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 different mapping than the mapping stored on the UE. To ensure that the base station and the UE have the same mapping for beam indication, a two-step update procedure may be employed 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 resources 8 in its feedback message as a resource indicator for reporting setting 1. Instead of setting 1 the update entry 4 directly for the report in its mapping, the base station and the UE add the CSI-RS resource 8 to the reserved entry for the latest feedback as the first step of a two-step update procedure.
Table 14-A example of mapping at UE before sending feedback
If the feedback message is successfully transmitted to the base station, the base station may transmit an acknowledgement to acknowledge receipt of the feedback message. The acknowledgements may be sent separately or may be included in the beam indication message. For example, the base station uses an additional bit (set to "1") to acknowledge the reception 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 acknowledgement, it updates the mapping again as the second step of the two-step update procedure to replace the entry reporting the setting 1 with the new CRI and to clear the entry from the reserved entry. Table 14-B shows an example of mapping at the UE after the UE receives the acknowledgement.
Table 14-B shows an example of mapping at the UE after the UE receives the acknowledgement.
Indexing
Index meaning
Resource indicator
0
First entry established by RRC
CSI-
1
Second entry established by RRC
CSI-
2
Third entry established by RRC
CSI-
3
Fourth entry established by RRC
CSI-RS resource 7
4
CRI for
CSI-RS resource 8
5
CRI for
CSI-RS resource 4
6
CRI for
CSI-RS resource 6
7
Retention
If the base station does not successfully receive the feedback, it does not know the new CRI. In the next beam indication message (e.g., DCI message), a bit for confirming the reception of feedback is set to "0". Now, the UE knows, after receiving the beam indication message, that its feedback was not correctly received. It may choose to keep the CSI-RS resources 8 in the reserved entries and resend the same feedback. It may also choose to clear the reserved entries and send a different feedback message.
Alternatively, the base station may acknowledge receipt of the feedback using the index of the reserved entry without using additional bits. For example, the base station may 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 may proceed to the second step of the two-step update procedure.
In another example, the base station may implicitly inform the UE whether it successfully received the feedback. For example, the base station and the UE maintain the mapping as shown in Table 14-C. After the UE transmits 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. With this indication, the base station implicitly informs the UE that the feedback message has been successfully received. Now, upon receiving this implicit confirmation, the UE updates Table 14-C with Table 14-D. Otherwise, the UE keeps 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 updates the mapping with its feedback message. Otherwise, the UE does not map using its feedback message.
Table 14-C example of mapping at UE before sending feedback
Indexing
Index meaning
Indicator symbol
0
First entry established by RRC
CSI-
1
Second entry established by RRC
CSI-
2
Third entry established by RRC
CSI-
3
Fourth entry established by RRC
CSI-RS resource 7
4
CRI for report settings 1 (before update)
CSI-
5
CRI for
CSI-RS resource 4
6
CRI for
CSI-RS resource 6
7
Retention
Retention
Table 14-D example of mapping at a UE before sending feedback
It is therefore apparent that a method of facilitating wireless communication is disclosed. As shown in fig. 7, method 700 includes: at 702, storing associations between a plurality of values in a map and a plurality of indicators, wherein each association comprises a value associated with one or more indicators; at 704, a feedback message is transmitted or received from the wireless communication node, wherein the message includes one or more indicators; at 706, an association is selected from the mapping based on the feedback message; and at 708, the one or more indicators are updated in association with the one or more indicators in the feedback message.
In some embodiments, the UE and/or the base station may update the mapping with 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 a base station and a UE having different mappings, which may be caused by transmission failure of a control signal, the control signal may be a high-level (high-level) signal such as an RRC or MAC-CE signal, instead of a DCI signal.
In some embodiments, the UE and/or the base station may update the mapping with information in the PRACH sent from the UE.
Time information for changing reference signal
In some embodiments, the beams associated with the reference signals may be changed in a periodic or semi-continuous manner. For example, as shown in fig. 8A, in time window 1(801) of CSI-RS, beam 1(802) is used. The beams associated with the CSI-RS change to beam 2(804) in time window 2(803) of the CSI-RS. In the time window 3(805) of the CSI-RS, the beam is changed to beam 3(806) again. Since the beams associated with the reference signals may vary over time, the feedback from the UE becomes time sensitive. Therefore, it is desirable for a base station to specify timing information related to a reference signal (or its corresponding indicator) when it informs a beam of DMRS/CSI-RS/SRS using the reference signal.
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 hypothesis between reference signals corresponding to CSI-
TABLE 15 example of time window based mapping
In the example shown in table 15, the UE may get large attributes of the DMRS and data derived from the large attributes of the CSI-
When the base station configures the CSI-RS resource/CSI-RS resource set/CSI-RS resource setting including the CSI-RS port, information of a time window of the CSI-RS port can be configured. When the base station configures measurement settings including a link between the reporting setting and the CSI-RS resource setting (including the CSI-RS port), information of a time window of the CSI-RS port may also be configured. When the base station configures a link between the report setup and the CSI-RS resource setup including the CSI-RS port, information of a time window of the CSI-RS port may also be configured. When the base station configures a report/report setting associated with a CSI-RS resource setting including a CSI-RS port, information of a time window of the CSI-RS port may also be configured. The information of the time window of the CSI-RS port may comprise one or more of the following parameters: a time window boundary, a number of OFDM symbols in the time window, and a number of CSI-RS periods in the time window. In particular, the number of OFDM symbols may further include the number of OFDM symbols having different subcarrier spacings.
The time window of the CSI-RS port may be implicitly determined by measuring the limited parameters. For example, measurement restriction may restrict a UE from measuring channels based on CSI-RS (or other reference signals) for a particular time window and reporting channel state information obtained on the channels in that time window.
In some embodiments, the time window boundaries may be determined based on the reporting or the time of the reporting setup. For example, the UE transmits channel state information for reporting the setting every 10 slots. For each instance of the report, there is a corresponding time window, and channel state information may be obtained from the CSI-RS in that time window. In some embodiments, the time window boundaries may be determined based on the time instants of the channel measurements. For example, the UE measures the channel every 5 slots, for each slot in which the UE measures the channel, there is a corresponding time window (e.g., from the last slot in which the UE measures the channel until the current slot, so the duration of the corresponding time window is 5 slots), and channel state information may be obtained from the CSI-RS in the time window.
In some embodiments, the base station may establish the boundaries of the CSI-RS time windows in each of the time windows by reporting the settings or ports associated with the CSI-RS. For example, as shown in fig. 8B, an association may be established between
In some embodiments, the time windows are included in a set of time windows. The set of time windows may be ordered by an 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 positioned closest in time domain to a transmission time of the second reference signal. A time interval between the end time of the first window and the transmission time of the second reference signal may be greater than a predetermined threshold. The set of time windows also includes a second time window located farthest 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 time of the second reference signal may be less than another predetermined threshold to ensure a proper distance from the first reference signal (e.g., DMRS).
Fig. 9 illustrates an example of a wireless communication system in which techniques in accordance with one or more embodiments of the present technology may 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. Base stations 905a, 905b may provide wireless service to wireless devices 910a, 910b, 910c, and 910d in one or more wireless sectors. In some embodiments, base stations 905a, 905b include directional antennas to generate two or more directional beams to provide wireless coverage in different sectors.
The access network 925 may be in communication with one or more base stations 905a, 905 b. In some embodiments, access network 925 includes one or more base stations 905a, 905 b. In some embodiments, the access network 925 communicates with a core network (not shown in fig. 9) that provides connectivity with other wireless and wired communication systems. The core network may include one or more service subscription databases to store information about subscribed wireless devices 910a, 910b, 910c, and 910 d. 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 in the field. The access network 925 may support a plurality of different radio access technologies.
In some embodiments, 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 may be used to connect to different wireless networks.
Fig. 10 is a block diagram representation of a portion of a radio station. A
Fig. 11 is a flowchart representation of a
In some embodiments, the value indicates a parameter set. The parameter set comprises one or more parameters for the at least one indicator. The one or more parameters include timing information of at least one indicator from the set of indicators of the wireless communication node, parameters of a reporting setup, parameters of a resource setup, parameters of a set of resources, signal quality or channel of the resources, and a sequence number.
In some embodiments, the value is associated with one or more attributes of the reference signal, the one or more attributes including: timing information, report settings, links, measurement settings, resource sets, resources, channel quality, signal quality, and channel conditions. In some embodiments, the value is associated with an order of one or more indicators in the feedback message.
In some embodiments, the method further comprises obtaining an association between a value in a map and at least one indicator selected from the one or more indicators, wherein the map comprises a predetermined set of associations between message-based indicators and values. In some embodiments, the method further comprises establishing a subset of the predetermined association set using high level signaling.
In some embodiments, the method further comprises updating the map based on a comparison of one or more indicators in the feedback message with indicators stored in the map. In some embodiments, the method further comprises updating the mapping with at least one of the one or more indicators from the feedback message when an ACK acknowledgement message for the feedback message is sent to the wireless communication node. In some embodiments, the method further comprises updating the mapping based on determining that the feedback message satisfies a predetermined set of criteria.
In some embodiments, the value also indicates an association between the reference signal indicated by the indicator and another reference signal.
Fig. 12 is another flowchart representation of a
In some embodiments, the value indicates a parameter set. The parameter set comprises one or more parameters for the at least one indicator. The one or more parameters include timing information of at least one indicator from the set of indicators of the wireless communication node, parameters of report settings, parameters of resource set indices, signal quality or channel of the resource, and sequence number.
In some embodiments, the value is associated with one or more attributes of the reference signal, the one or more attributes including: timing information, report settings, links, measurement settings, resource sets, resources, channel quality, signal quality, and channel conditions. In some embodiments, the value is associated with an order of one or more indicators in the feedback message.
In some embodiments, the method further comprises obtaining an association between a value in a map and at least one indicator selected from the one or more indicators, wherein the map comprises a predetermined set of associations between message-based indicators and values. In some embodiments, the method further comprises establishing a subset of the predetermined association set using high level signaling.
In some embodiments, the method further comprises updating the map based on a comparison of one or more indicators in the feedback message with indicators stored in the map. In some embodiments, the method further comprises updating the mapping with at least one of the one or more indicators from the feedback message when an ACK acknowledgement message for the feedback message is sent to the wireless communication node. In some embodiments, the method further comprises updating the mapping based on determining that the feedback message satisfies a predetermined set of criteria.
In some embodiments, the value also indicates an association between the reference signal indicated by the indicator and another reference signal.
Fig. 13 is another flowchart representation of a
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 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: it is determined to transmit a feedback message in 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 for data transmission.
Fig. 14 is another flowchart representation of a wireless communication method 1400. The method 1400 comprises: at 1402, transmitting a reference signal based feedback message to a wireless communication code, the feedback message including channel state information of a communication link; and at 1404, a message is received from the wireless communication node indicating a receipt 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 a reference signal for data transmission.
Fig. 15 is another flowchart representation of a
In some embodiments, the attributes of the time window are configured in at least one of the plurality of parameter sets. The plurality of parameter sets includes a parameter set of measurement settings associated with the first reference signal, a parameter set of a link associated with the first reference signal, a parameter set of reporting settings associated with the first reference signal, a parameter set of resource settings including the first reference signal, a parameter set of resource sets including the first reference signal, and a parameter set of resources including the first reference signal.
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, links, report settings, reports, resource settings, resource sets, and resources. The time window may also be determined based on one or more attributes associated with the first reference signal, including measurement settings, link and reporting settings. In some embodiments, the method further comprises determining a boundary of the time window based on a time instant of the reporting setting associated with the first reference signal.
In some embodiments, the time windows are included in a set of time windows. In some embodiments, the set of time windows includes a first time window positioned at a first distance in the time domain from a transmission time of the second reference signal. The time interval between the end time of the first time window and the time of transmission or reception of the second reference signal is greater than a predetermined threshold and the first distance is shorter than the distances of the 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 positioned 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 the other time windows in the set of time windows from the transmission time of the second reference signal.
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 a start time or an end time of the time window.
In some embodiments, the set of time windows includes a first time window located closest in time domain to a transmission time of the second reference signal and a second time window located furthest in time domain from the transmission time of the second reference signal.
Some embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. The computer readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), Compact Discs (CDs), Digital Versatile Discs (DVDs), and the like. Thus, a computer-readable medium may include a non-transitory storage medium. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
Some disclosed embodiments may be implemented as a device or module using hardware circuitry, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and/or digital components, e.g., integrated as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as Application Specific Integrated Circuits (ASICs) and/or as Field Programmable Gate Array (FPGA) devices. Some embodiments may additionally or alternatively include a Digital Signal Processor (DSP), which is a special-purpose microprocessor having an architecture optimized for the operational requirements of digital signal processing associated with the disclosed functionality of the present application. Similarly, various components or sub-components within each module may be implemented in software, hardware, or firmware. Connections between modules and/or components within modules may be provided using any of a variety of connection methods and media known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using an appropriate protocol.
Although this patent document contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Certain features that are described in this patent document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, 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.
Only some embodiments and examples are described, and other embodiments, enhancements and variations can be made based on what is described and illustrated in this patent document.
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