Patent Description:
The standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called <NUM> New Radio (<NUM> NR) as well as a Next Generation Packet Core Network (NG-CN or NGC). The <NUM> NR will have three main components: a <NUM> Access Network (<NUM>-AN), a <NUM> Core Network (5GC), and a User Equipment (UE). In order to facilitate the enablement of different data services and requirements, the elements of the 5GC, also called Network Functions, have been simplified with some of them being software based so that they could be adapted according to need. <CIT>, <NPL>), and <NPL>) are related prior art.

The example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure, which is only limited by the appended claims. Accordingly, there is provided a method for receiving a plurality of transmission configuration indicator, TCI, states by a wireless communication device as set out in independent claim <NUM>, a method for transmitting a plurality of TCI, states by a wireless communication node as set out in independent claim <NUM>, a wireless communication device as set out in independent claim <NUM> and wireless communication node as set out in independent claim <NUM>. Other advantageous embodiments are defined in the dependent claims.

The following acronyms are used throughout the present disclosure:.

<FIG> illustrates a block diagram of an example wireless communication system <NUM> for transmitting and receiving wireless communication signals (e.g., OFDM/OFDMA signals) in accordance with some embodiments of the present solution. The system <NUM> may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system <NUM> can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment <NUM> of <FIG>, as described above.

In a single frequency network (SFN) scenario, the two transmission/reception points (TRPs) may transmit the same information to one user equipment (UE). In the high speed train(HST)-SFN scenarios, the UE may move from one TRP to the other TRP, so the Doppler caused by high speed may be opposite from the two TRPs. Because UE is moving away from TRP0 and forward to TRP1, an opposite frequency offset on the same PDSCH from different TRPs may arise. As a result, the frequency offset from the two TRPs may be compensated.

The two TRPs may transmit the same information to one UE, and the tracking reference signal (TRS) may be configured to estimate a frequency offset (e.g., Doppler shift) caused by the high speed. One TCI state can be configured with one TRS resource or resource set from one TRP. In this manner, if only one TRS is configured for a SFN PDSCH from two TRPs, the difference or opposite frequency offset may not be estimated correctly.

The transmission configuration indicator (TCI) states may be activated by media access control control element (MAC-CE) and indicated by downlink control information (DCI) identifying parameters, such as Doppler shift and Doppler spread. The TCI states may be configured for the TRS and a physical downlink shared channel (PDSCH). If the quasi-co-location (QCL) information configured in the TCI states can be provided to the UE, how the UE is to use the QCL information contained in the two TCI states configured for two TRPs may be considered.

At least one TRS may be configured for each TRP. The TRS may be used in conjunction with pre-compensation for PDSCH frequency offset compensation in HST-SFN transmission. If pre-compensation is supported in the HST-SFN scenario, the downlink carrier frequency (corresponding to the frequency offset) should may indicated to UE for modulating the uplink reference signal (RS) or PUSCH. When the TRPs receive the uplink SRS, the TRP can obtain the frequency offset for the downlink transmission and use this estimated frequency offset as the pre-compensation frequency offset value. The related Doppler parameters may be indicated to UE by activating or indicating TCI states to UE. Four QCL types may be used to this end:.

The TCI states may be activated by MAC CE and indicated by DCI identifying the parameters such as Doppler shift and Doppler spread. The TCI states can be configured for the TRS and PDSCH. In this manner, the UE can acquire the Doppler related parameters according to the TCI states.

Referring now to <FIG>, depicted is a block diagram of a system <NUM> for quasi-co-location information using transmission configuration indicators. The system <NUM> may include at least one user equipment (UE) <NUM> (e.g., UE <NUM>) and one or more transmission/reception points (TRPs) 310A and 310B (e.g., BS <NUM>) (also referred herein generally as TRP <NUM>), among others. A TCI codepoint may contain two TCI states activated or indicated to one UE. The UE may receive the two TCI states and acquire the QCL information in one or more techniques. First, the UE may obtain using a first type (or kind) QCL information to acquire all the QCL information of one of the two TCI states. Second, the UE may obtain using a second type (or kind) QCL information to acquire one or some of the QCL information of the other TCI states.

In some embodiments, a MAC CE may activate two TCI states or one TCI codepoint in the DCI indicating the two TCI states. The UE may receive the two TCI states and acquire the QCL information from all the QCL information of one of the two TCI states and ignore one or more QCL information of the other TCI states.

In some embodiments, a MAC CE may activate plurality of transmission configuration indicator (TCI) states. In some embodiments, a DCI may indicate one codepoint that contains two TCI states to the UE. The UE may identify the PDSCH or the downlink reference signal that is transmitted from two TRPs. Also, a higher layer parameter (e.g., radio resource control (RRC) signaling) can configure the transmitting scheme as SFN. If only one demodulation reference signal (DMRS) code division multiplexing (CDM) group is configured, the UE may determine that the transmitting scheme is SFN according to the RRC parameter and the number of activated or indicated TCI states.

In the SFN scheme, the same PDSCH may be transmitted from several TRPs. For example, with two TRPs, two TCI states may be activated or indicated for SFN scheme. The QCL information may be configured in each TCI state. For example, QCL type A, or QCL type B, or QCL type C can be configured for FR1 (a first frequency band), and QCL type D can be configured with one of QCL type A, or QCL type B or QCL type C for FR2 (a second frequency band).

In the high speed scenario (e.g., HST), the UE may move fast from some TRPs to some other TRPs. The frequency offset caused by the high speed may be different or even opposite between these TRPs. Considering that the same PDSCH is transmitted from different TRPs in the high speed scenario, pre-compensation may be used to address the problem of different frequency offset from different TRPs.

If the UE can modulate the uplink reference signal according to the downlink carrier frequency and frequency offset (e.g., Doppler shift), UE may obtain the Doppler shift or Doppler spread from QCL information in the TCI states. This can be configured by higher layer parameter (e.g., RRC signaling). If the frequency offset pre-compensation of PDSCH or downlink reference signal (DL-RS) is configured by RRC signaling, the UE may obtain the Doppler-related information from the related TCI state.

Two TCI states may be activated for SFN transmission. For FR1, the QCL type in the TCI states can be QCL type A or QCL type C. For example, with QCL type A, the QCL related parameters may include {Doppler shift, Doppler spread, average delay, delay spread}. The same QCL type may be configured for the two TRPs. The uplink reference signal may be modulated at the carrier frequency based on the downlink carrier frequency and the frequency offset. The frequency offset related parameter can be obtained from the QCL parameter Doppler shift. But one Doppler shift can be found in each QCL information from each TCI state, and only one Doppler shift can be used as the reference frequency offset parameter or module uplink reference. The Doppler shift from the other TCI states may be ignored. As a result, if two TCI states are activated or indicated to one UE, and the transmission scheme is SFN, all the QCL information from one TCI state may be acquired. In addition, one or more of the QCL information from the other TCI state may be acquired.

Furthermore, the Doppler shift or some more QCL parameters contained in the other TCI states may be not be used as a reference. For example, as depicted, the QCL types of the two TCI states configured for the two TRPs in the SFN scenario may be QCL type A. In such a scenario, all the parameters, (e.g.,{Doppler shift, Doppler spread, average delay, delay spread}) may be the reference parameter of the related TCI states for one TCI state, and one or some of these parameters may be ignored by the UE. In the high speed scenario if pre-compensation is used, the Doppler shift may not be considered from the other TCI state (e.g., {Doppler spread, average delay, delay spread}).

Also, the {Doppler shift, Doppler spread} may be ignored, and the UE can acquire the QCL parameters of {average delay, delay spread} from the second set of TCI states. The Two TRPs may be configured with the same TRS resources or different resources. For example, as depicted, different TRS resources may be considered. TRS1 may be transmitted from TRP1 and may be configured with TCI <NUM>. Furthermore, TRS2 is transmitted from TRP2 and is configured with TCI <NUM>. In addition, if QCL type C is configured in the activated or indicated TCI state, the QCL parameters {Doppler shift, average delay} may be contained in the TCI states. As such, {Doppler shift, average delay} from one TCI state may be considered and only {average delay} from the other TCI state may be considered.

The QCL types from different TCI states may be different. For example, QCL type A can be configured in the first TCI states, and QCL type C can be configured in the other TCI state, and the above method is still applicable. In some other scenarios or schemes, one or some of the QCL parameters in the QCL information contained in the TCI states can be ignored, and the above method is still applicable. As a result, one or some of the QCL parameters can be acquired by the UE from the second set of TCI states, obtain the delay related parameters in the QCL information. For example, in some scenarios, one or more these related parameters in the QCL information can be ignored. For the QCL Type A, if the {average delay, delay spread} are ignored, the remaining parameter of {Doppler shift, Doppler spread} can be acquired by the UE from the second set of TCI states.

If QCL type B is configured in the activated or indicated TCI state, the QCL parameters {Doppler shift, Doppler delay} may be contained in the TCI states. According to the above analysis, {Doppler shift} from one TCI state may not be considered and only {Doppler delay} from the other TCI state may be considered. If both the {Doppler shift, Doppler delay} are not used in some scenario, so the QCL type B may not be configured for the second set of TCI states.

The first TCI state of the activated or indicated two TCI states may be default or predefined as both TCI states contains the first type of the QCL information. The second TCI state of the activated or indicated two TCI states may contain the second type of the QCL information. The second TCI state of the activated or indicated two TCI states may be default or predefined as both TCI states contains the first type of the QCL information. The first TCI state of the activated or indicated two TCI states may contain the second type of the QCL information.

In the SFN scheme, if two TCI states are activated or indicated for the PDSCH transmission, according to above description, one TCI states may contain the first kind (or type) of QCL information. For example, in Table <NUM> below, <NUM> TCI codepoints may be activated and TCI codepoints <NUM>,<NUM>,<NUM>,<NUM> containing two TCI states. If these <NUM> TCI codepoints can be used for SFN scheme, the first TCI state of each TCI codepoint containing <NUM> TCI states may be identified as containing the first type of QCL information. Furthermore, the second TCI state of each TCI codepoint containing 2TCI states may be identified as containing the second kind (or type) of QCL information. The first kind of QCL information may be all the configured QCL information of the first set of TCI states. The second kind of QCL information may be partial or no portion of the QCL configured information of the second set of TCI states.

The TCI states contained in the TCI codepoint can be indicated by DCI. As such, one TCI codepoint in Table <NUM> can be indicated (e.g., codepoint <NUM>). Therefore, the TCI state <NUM> may be the default TCI that contains the first type of QCL information, and TCI state <NUM> contains the second type of QCL information. Furthermore, in some scenarios, the offset between the reception of the DL DCI and the corresponding PDSCH may be less than the threshold timeDurationForQCL. The QCL relation of PDSCH corresponding to the lowest codepoint among the TCI codepoints may contain two different TCI states (codepoint <NUM> in Table <NUM>). The TCI state <NUM> may be the default TCI that contains the first type of QCL information, and TCI state <NUM> contains the second type of QCL information.

Considering that QCL type A or QCL type B or QCL type C is supported in FR1(frequency range <NUM>) and one more QCL type D is supported in FR2, QCL type D can be configured with the QCL type A or QCL type B or QCL type C. Thus, the QCL information in QCL type D may influence (may be independent of) the other QCL types. The two types of QCL information can be supported both in FR1 and FR2.

Referring now to <FIG>, depicted is a relational diagram of a configuration <NUM> for a demodulation reference signal (DMRS) code division multiplexing (CDM) group index to be used in the system <NUM>. The antenna ports of DMRS or the DMRS CDM group index can be used to indicate the QCL information of the two TCI states.

The antenna port indication in the DCI field may be indicated using DMRS of PDSCH (e.g., as seen in Table <NUM>). As DMRS port <NUM> and DMRS port <NUM> may share the same DMRS group (<NUM>). Furthermore, DMRS port <NUM> and DMRS port <NUM> may share the same DMRS CDM group (<NUM>). Thus, when up to two layers (values up to <NUM>) are supported, for a SFN scheme, only one DMRS CDM group may be configured for one UE. For example in Table <NUM>, value <NUM> and <NUM> may indicate <NUM> DMRS ports respectively. The <NUM> DMRS ports indicated by one (or each) value may be from the same DMRS CDM group ({<NUM>} is group <NUM>; {<NUM>,<NUM>} is group1. Thus, the DMRS CDM group index (value) can be used as the indication of the kind of QCL information to acquire from each TCI state.

For example, in Table <NUM>, the value <NUM> may indicate that the DMRS ports are port <NUM> and port <NUM> of the CDM group <NUM>, and can indicate that the first TCI state contains the first type of QCL information and the second TCI state contains the second type of QCL information. The value <NUM> may indicate the DMRS ports are port <NUM> and port <NUM> of the CDM group <NUM>, and can indicate that the first TCI state contains the second kind of QCL information and the second TCI state contains the first kind of QCL information. If one DMRS port is indicated and that it also can be found the DMRS port is configured for one DMRS CDM group, different DMRS CDM group index also can be used.

If more than one DMRS CDM group is supported for SFN scheme (e.g., found in Table <NUM> the value <NUM> to <NUM>), <NUM> DMRS CDM group may be configured for one UE. Therefore, the use of only the DMRS CDM group index may not distinguish between the two QCL information, and more information may be used. If <NUM> DMRS ports are indicated in Table as value <NUM> and value <NUM>, <NUM> DMRS ports from <NUM> DMRS CDM groups may be two DMRS ports from one CDM group and one DMRS port from the other CDM group. As such, if two DMRS ports are from DMRS CDM group <NUM> and the third DMRS port is from DMRS CDM group <NUM>, the first TCI states may contain the first type of QCL information and the second TCI states may contain the second type of QCL information. UE can acquire all configured QCL information (e.g., the first kind of QCL information) from the first indicated TCI state, and acquire partial of configured QCL information (e.g., the second kind of QCL information) from the second indicated TCI state.

If two DMRS ports are from DMRS CDM group <NUM> and the third DMRS port is from DMRS CDM group <NUM>, the first TCI states may contain the second kind of QCL information and the second TCI states may contain the first kind of QCL information. If <NUM> DMRS ports are configured for one UE, the DMRS ports of CDM group <NUM> may be all used. The first TCI state may contain the first kind of QCL information and the second TCI states may contain the second kind of QCL information. For value <NUM>, only one DMRS port of DMRS CDM group <NUM> is used. The first TCI state may contain the second kind of QCL information and the second TCI states may contain the first kind of QCL information.

The antenna ports of DMRS can be used to indicate that which TCI state(s) are used as the first set of TCI states that contains all configured QCL information and which TCI state(s) are used as the second set of TCI states that contains partial portion configured QCL information. This may be because the antenna ports of DMRS indicate which DMRS port(s) are configured to UE and the configured DMRS port(s) can be used to indicated the set of TCI states. For example, the value <NUM> in table <NUM> may indicate that the configured DMRS ports are {<NUM>,<NUM>}. The value may indicate that the first TCI states is the first set of TCI states containing all configured QCL information. Furthermore, the value may indicate that the second TCI states is the second set of TCI states containing partial configured QCL information. The value <NUM> in table <NUM> may indicate that the configured DMRS ports are {<NUM>,<NUM>}. The value may indicate that the second TCI states is the first set of TCI states containing all configured QCL information, and the first TCI states is the second set of TCI states containing partial configured QCL information.

Referring now to <FIG>, depicted is a block diagram of an environment <NUM> of the system <NUM> for quasi-co-location information using transmission configuration indicators with a moving user equipment (UE) <NUM> in a direction <NUM>. The QCL information can be indicated by the UE location. In the high speed train single frequency net scenario as depicted, the train may travel from one TRP (e.g., TRP 310A) to another TRP (e.g., TRP 310B), and there may be a few obstructions (e.g., buildings) blocking the signals from the TRP to the train with the UE (e.g., UE <NUM>). Therefore, the receiving power of the PDSCH or the downlink RS may have some relation with the distance of the signal transmitted. The power loss may be smaller with the short distance than that with the long distance. In many situations, the two TRPs may transmit the PDSCH and the downlink RS with the same or similar power. The UE can receive PDSCH or downlink RS with the smaller power loss, because UE is near one TRP and far away from the other TRP. The higher receiving power with the same noise may always correspond to the better performance of demodulation for one UE. If UE is close to one TRP, the UE can have the better receiving power and make the better performance to estimate the frequency offset.

Two sets of QCL information may be contained in the activated or indicated two TCI stated for the two TRPs. One set of QCL information may be treated as the first type QCL and used to indicate the Doppler related parameters. In this manner, the TCI states of the closer TRP from the UE may contain the first kind of QCL information, because the first kind of QCL information may give the more accurate frequency offset estimation. The Doppler related parameter (e.g., {Doppler shift}) may be ignored from the farther TRP, and the second kind of QCL information may be contained in the TCI configured for this TRP. The TRPs may be settled along with the railway (e.g., along the direction <NUM>). The location of the UE can be identified by the TRP, also can be known by the UE because of the different receiving power of the downlink RS of the two TCI states configured for the two TRPs. The UE location can indicate the using of QCL information of the two TCI states. For one UE location, the TCI state of the first TRP may contain the first type of QCL information. The TCI state of the second TRP may contain the second type of QCL information. When the UE is in the middle of the two TRPs, the TCI states of the coming or approaching TRP may contain the first type of QCL information.

Referring now to <FIG>, depicted a block diagram of an environment <NUM> of the <NUM> system for quasi-co-location information using transmission configuration indicators with multiple sets 605A and 605B of transmission/reception points (TRPs) 310A-D. For example, as depicted, four TRPs 310A-D may be transmitting he SFN PDSCH to one UE, and <NUM> TRS resources or TRS resource sets are configured.

If one TCI state is configured for one TRS, <NUM> TCI states may be indicated or activated for one UE, and one QCL information is contained in each TCI state. As such, one TCI codepoint may be able to contain more TCI states as shown in Table <NUM> below. The codepoint <NUM> and codepoint <NUM> may indicate <NUM> TCI states respectively. One TCI state may contain the first type of QCL information, and the other TCI states may contain the second type of TCI states. With several TCI states indicated to the UE, more than one TCI states may include the first type of QCL information and the other TCI states may contain the second type of TCI states. As such, the UE may acquire all the QCL information from the first set of TCI states, including one or more TCI states from the indication. The UE mays also acquire partial portion of QCL information from the second set of TCI states include the other TCI states from the indication.

With one codepoint containing one or two TCI states (e.g., as defined in release <NUM>), if more than <NUM> TRS is configured, TRS resources or resource sets from some TRPs can be configured with the same time domain and frequency domain resources and the same sequence. Thus, one TCI codepoint may contain <NUM> TCI states, and one TCI state may be associated with several TRS resources and may contain the first kind of QCL information. The other TCI states may be associated with several other TRS resources and may contain the second kind of QCL information as shown.

One TCI states is configured for one TRS resource or resource set, and the PDSCH or the DL RS from several TRPs is indicated by one TCI states, that means one TRS is configured from different TRPs and indicated as the first set of TCI state. And one other TRS is configured for other TRPs and indicated as the second set of TCI state.

Referring now to <FIG>, depicted is a relational diagram of an configuration <NUM> of transmission configuration indicators (TCI) with a codepoint with a single quasi-co-location (QCL) type. Referring also to <FIG>, depicted is a relational diagram of a configuration <NUM> of transmission configuration indicators (TCI) with a codepoint with multiple quasi-co-location (QCL) types. If the second QCL information is defined to a new QCL type in the HST-SFN scenario, the {Doppler shift} may not be contained in the QCL information. As such, the new QCL type may be configured for the HST-SFN scenario. The new QCL type may be configured mainly for pre-compensation in the HST-SFN scenario. The other schemes (e.g., as defined in release <NUM> and release <NUM>) may not rely on this new QCL type. Once the new QCL type is configured, the UE may identify that the scheme is HST-SFN and the pre-compensation is used. The configuration of a new QCL type may indicate the configuration of HST-SFN and pre-compensation.

One codepoint may contain <NUM> TCI states configured for <NUM> TRPs. QCL type A or type C can be configured in one TCI state and the new TCI state may be configured for the other TCI state. In pre-compensation, the uplink RS may indicate which TCI state may be associated to acquire the QCL information. With the Doppler shift or the Doppler spread or both of the two parameters not contained in the new QCL type, the TCI that contains the QCL type A or QCL type C may be associated with the uplink RS (e.g., as depicted).

In the PDSCH transmission, QCL type A or QCL type C can be configured in the TCI states configuration. As such, different QCL information may be configured for different scenarios. For HST-SFN scheme, if QCL type A is configured, the parameter{Doppler shift, Doppler spread, average delay, delay spread} may be contained. If the new QCL type is supported in this scenario, the Doppler shift may not be contained in the new QCL type. As such, the new QCL type may contain the QCL information {Doppler spread, average delay, delay spread}. If QCL type C is configured in this scenario, the QCL information may include {Doppler shift, average delay}, and the new QCL type can be configured as {average delay}. In FR2, the QCL type D in the TCI state may be configured to indicate the Rx spatial relation, the new QCL type and QCL type D may be configured in one TCI state.

The uplink reference signal (RS) can be indicated or configured to be associated with one downlink RS (e.g., TRS). If the uplink RS is indicated or configured with one TRS resource or resource set, the UE may acquire the QCL information from the TCI state of TRS resource to be used as the reference to module the UL RS in the HST-SFN scheme. The Doppler related parameters in the QCL information of the TCI states configured or indicated to one TRS resource may be identified as to be used as the reference information to module the UL RS. Thus, the TCI states configured or indicated for plurality of TRS resource(s) which are associated with the UL RS may be the first set of TCI states. Furthermore, the other TCI states configured or indicated for other TRS resource(s) may be the second set of TCI states. Similar to the PDSCH, the MAC CE can activate or the DCI can indicate the TCI states for the PDCCH, and thus only partial configured QCL information of the second indicated set of TCI states may be acquired by the UE.

Referring now to <FIG>, depicted is a flow diagram of a method <NUM> for quasi-co-location information using transmission configuration indicators. The method <NUM> may be implemented using or performed by one or more components detailed herein, such as BS <NUM>, UE <NUM>, UE <NUM>, or TRP <NUM>. In brief overview, a wireless communication node may identify transmission configuration indicator (TCI) states (<NUM>). The wireless communication node may transmit an indication of the TCI states (<NUM>). A wireless communication device may receive the indication of the TCI states (<NUM>). The wireless communication device may determine whether a transmission scheme is configured for a single frequency network (SFN) (<NUM>). The wireless communication device may acquire all configured quasi co-located (QCL) information of a first set of TCI states (<NUM> and <NUM>'). When the transmission scheme is for SFN, the wireless communication device acquires partial portion or no portion of the QCL information of the second set of TCI states (<NUM>).

In further detail, a wireless communication node (e.g., the BS <NUM> or TRP <NUM>) may determine or identify transmission configuration indicator (TCI) states (<NUM>). The TCI states may be triggered, initiated, or otherwise activated for a particular wireless communication device (e.g., the UE <NUM>). For example, the TCI states may be activated via a media access control, control element (MAC-CE) or downlink control information (DCI). In some embodiments, the wireless communication node may identify multiple sets of TCI states for the wireless communication node. Each of the TCI states may be configured with a tracking reference signal (TRS) resource to permit estimation of a frequency offset arising from a motion of the wireless communication device relative to the wireless communication device in the environment.

Furthermore, each TCI state may indicate quasi-co-location (QCL) information for the wireless communication device. The QCL information may define correlation among data (e.g., in the form of symbols) communicated from different antenna ports. The QCL information may include one or more types of QCL. Each type of QCL may include one or more parameters. For example, QCL Type A may include {Doppler shift, Doppler spread, average delay, delay spread}, QCL Type B may include {Doppler shift, Doppler spread}, QCL Type C may include {Doppler shift, average delay}, and QCL Type D may include {Spatial Rx parameter}.

The wireless communication node may send, provide, or otherwise transmit an indication of the TCI states to a wireless communication device (e.g., the UE <NUM> or <NUM>) (<NUM>). With the activation of the TCI states for the wireless communication device, the indication of the TCI states may be transmitted by the wireless communication node. The indication may define, correspond to, or identify the TCI states and the QCL information of each TCI state identified for the wireless communication node. In some embodiments, the wireless communication node may provide the indication of the TCI states via MAC-CE, DCI, or one or more TCI code points. In some embodiments, the wireless communication node may transmit an indication whether a transmission scheme is for a single frequency network (SFN) to the wireless communication device via a higher layer signaling (e.g., radio resource control (RRC) signaling). When the indication specifies SFN, the indication may further identify or define that, in the SFN, only a partial portion of the configured QCL information of another set of TCI states is to be acquired. On the other hand, when the indication does not specify SFN, the indication may further identify or define that at least a portion of the configured QCL information of the set of TCI states is to be acquired.

The wireless communication device may retrieve, identify, or otherwise receive the indication of the TCI states from at least one wireless communication node (<NUM>). In some embodiments, the wireless communication device may receive the indication of the TCI states from multiple wireless communications nodes (e.g., TRPs <NUM>). In some embodiments, the wireless communication device may receive the indication of TCI state via MAC-CE, DCI, or one or more TCI code points from each wireless communication node. In some embodiments, the wireless communicate node may receive the indication that the transmission scheme is for the SFN from the wireless communication node via the higher layer signaling. The indication may further identify or define that, in the SFN, only a partial portion of the configured QCL information of at least one set of state is to be acquired by the wireless communicate device. Conversely, when the indication does not specify SFN, the indication may further identify or define that at least a portion of the configured QCL information of the set of TCI states is to be acquired.

The wireless communication device may determine whether a transmission scheme is configured for SFN (<NUM>). Based on the indication received from the wireless communication node, the wireless communication device may identify or determine the transmission scheme. If the indication specifies that the transmission scheme is to be SFN, the wireless communication device may determine that the transmission scheme is configured for SFN. Conversely, if the indication specifies that the transmission scheme is not to be SFN, the wireless communication device may determine that the transmission scheme is not configured for SFN. In some embodiments, the wireless communication device may determine that the transmission scheme is not configured for SFN when the indication is not received (e.g., by default).

The wireless communication device may acquire all configured quasi co-located (QCL) information of a first set of TCI states (<NUM> and <NUM>'). The QCL information of the first set of TCI states may be from a plurality of TCI states. The first set of TCI states may correspond to or include at least one first TCI state. The information in all the configured QCL information may depend on the QCL-type specified for the first TCI state. For example, as discussed above, QCL Type A may include {Doppler shift, Doppler spread, average delay, delay spread}, QCL Type B may include {Doppler shift, Doppler spread}, QCL Type C may include {Doppler shift, average delay}, and QCL Type D may include{Spatial Rx parameter}. The wireless communication device may initially identify all the parameters included in the configured QCL information as defined in the QCL-type.

In some embodiments, the wireless communication device may determine to acquire all the configured QCL information from the first set of TCI states. In some embodiments, the determination may be in accordance to with a location of the wireless communication device. The location of the wireless communication may be defined relative to the wireless communication node. In some embodiments, the determination to acquire all the configured QCL information may be in accordance with an antenna port indication of a demodulation reference signal (DMRS). The antenna port indication may be identified in the DCI field using DMRS of a physical downlink shared channel (PDSCH) received from the corresponding wireless communication device. In some embodiments, the determination to acquire all the configured QCL information may be in accordance with a DMRS code division multiplexing (CDM) group index. The DMRS CDM group index may identify at least one value for a CDM group corresponding to the first set of TCI states.

When the transmission scheme is for SFN, the wireless communication device acquires a partial portion or no portion of configured QCL information of a second set of TCI states (<NUM>). The QCL information of the second set of TCI states may be from a plurality of TCI states. The second set of TCI states may correspond to or include at least one second TCI state. The information in all the configured QCL information may depend on the QCL-type specified for the second TCI state. In some embodiments, the QCL type in the second set of TCI states may include QCL type A or QCL type C for a first frequency range (FR1).

The wireless communication device may acquire the partial portion of the QCL information of the second set of TCI states. In acquiring the partial portion of the configured QCL information of the second set of TCI states, the wireless communication device removes one or more parameters from all the QCL parameters in each TCI state of the second set of TCI states. With the removal, the wireless communication node uses or identifies one or more remaining QCL parameters as the partial portion of the configured QCL information. The partial portion may includes or identifies remaining QCL parameter after removing {Doppler Shift, Doppler Spread} from all configured QCL parameters in each TCI state of the second set of TCI states.

In some embodiments, the wireless communication device may acquire the partial portion of the configured QCL information from the second set of TCI states based on the QCL-type defined for the corresponding TCI states in the second set. In some embodiments, for QCL Type A information included in each TCI state of the second set of TCI states, the partial portion may identify or include {Doppler Spread, Average Delay, Delay Spread}. In some embodiments, for QCL Type A information included in each TCI state of the second set of TCI states, the partial portion may identify or include {Average Delay, Delay Spread}. In some embodiments, for QCL Type C information included in each TCI state of the second set of TCI states, the partial portion may identify or include {Average Delay}. In some embodiments, for QCL Type B information included in each TCI state of the second set of TCI states, the partial portion may identify or include {Doppler Spread}.

In some embodiments, the wireless communication device may determine to acquire the partial portion of the configured QCL information from the second set of TCI states. In some embodiments, the determination may be in accordance to with a location of the wireless communication device. The location of the wireless communication may be defined relative to the wireless communication node. In some embodiments, the determination to acquire the partial portion of the configured QCL information may be in accordance with an antenna port indication of a demodulation reference signal (DMRS). The antenna port indication may be identified in the DCI field using DMRS of a physical downlink shared channel (PDSCH) received from the corresponding wireless communication device. In some embodiments, the determination to acquire the partial portion of the configured QCL information may be in accordance with a DMRS code division multiplexing (CDM) group index. The DMRS CDM group index may identify at least one value for a CDM group corresponding to the first set of TCI states.

In some embodiments, the wireless communication device may acquire no portion of the QCL information of the second set of TCI states. Based on the determination that the transmission scheme is for SFN, the wireless communication device may determine that the partial portion of the configured QCL parameters of each state in the second set of TCI states is not to be used as a reference. In some embodiments, the wireless communication device may use all the QCL information acquired from the first set of TCI states in response to the determination.

Claim 1:
A method, comprising:
receiving, by a wireless communication device (<NUM>, <NUM>, <NUM>), an indication of a plurality of transmission configuration indicator, TCI, states, from a wireless communication node (<NUM>, <NUM>, <NUM>);
acquiring, by the wireless communication device (<NUM>, <NUM>, <NUM>), all configured quasi co-located, QCL, information of a first set of TCI states from the plurality of TCI states; and
acquiring, by the wireless communication device (<NUM>, <NUM>, <NUM>), a partial portion of configured QCL information of a second set of TCI states from the plurality of TCI states, when a transmission scheme is configured for single frequency network, SFN,
wherein the partial portion comprises one or more remaining QCL parameters after removing {Doppler Shift, Doppler Spread} from all configured QCL parameters in each TCI state of the second set of TCI states.