Constraints on a source reference signal for quasi-collocation timing reference of a positioning reference signal
Disclosed are techniques related to wireless communications. In an aspect, a network entity determines whether a source reference signal transmitted from a first transmission-reception point (TRP) is a quasi-collocation (QCL) source of a target reference signal transmitted from a second TRP based, at least in part, on a first bandwidth (BW) portion occupied by the source reference signal and a second BW portion occupied by the target reference signal, the first BW portion having a first start frequency and a first BW size and the second BW portion having a second start frequency and a second BW size, and configures a user equipment (UE) with the source reference signal as the QCL source of the target reference signal when it is so determined.
1. A network entity, comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, wherein the one or more processors, either alone or in combination, are configured to:
define a first set of configuration information for a source reference signal having a source reference signal bandwidth portion defined by a source reference signal start frequency and a source reference signal bandwidth size of one or more first physical resource blocks, wherein the source reference signal is a downlink reference signal;
define a second set of configuration information for a target reference signal having a target reference signal bandwidth portion defined by a target reference signal start frequency and a target reference signal bandwidth size of one or more second physical resource blocks, wherein the target reference signal is a downlink positioning reference signal; and
transmit, via the one or more transceivers, the first and second sets of configuration information for configuring a user equipment (UE), wherein the first and second sets of configuration information indicate a quasi-co-location (QCL) relationship between the source reference signal and the target reference signal, and wherein the QCL relationship is based on a transmitting transmission-reception point (TRP) and the source reference signal bandwidth portion and the target reference signal bandwidth portion being a same bandwidth portion.
2. The network entity of claim 1 , wherein the network entity is one of a location server, a location management function, or a serving TRP.
3. The network entity of claim 1 , wherein the source reference signal is a QCL source for the target reference signal with respect to Doppler shift, Doppler spread, average delay, delay spread, spatial receive parameter, or any combination thereof.
4. The network entity of claim 1 , wherein:
the source reference signal is one of a first downlink positioning reference signal (DL-PRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS), and
the target reference signal is a second DL-PRS.
5. The network entity of claim 1 , wherein:
the one or more processors, either alone or in combination, are configured to determine that the source reference signal and the target reference signal are transmitted from the transmitting TRP when the source reference signal and the target reference signal satisfy a frequency layer constraint, and
the frequency layer constraint specifies that a first frequency layer is the same as a second frequency layer, the first frequency layer being a frequency layer of the source reference signal, and the second frequency layer being a frequency layer of the target reference signal.
6. The network entity of claim 1 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first component carrier (CC), at least one first band, and/or at least one first bandwidth part (BWP) of the source reference signal, and
the one or more processors, either alone or in combination, are configured to:
determine the source reference signal bandwidth portion based on the at least one first CC, the at least one first band, and/or the at least one first BWP prior to a determination of whether the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion.
7. The network entity of claim 6 , wherein the source reference signal is a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB).
8. The network entity of claim 1 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first CC of the source reference signal, and
the one or more processors, either alone or in combination, are configured to:
determine at least one second CC based on the target reference signal bandwidth portion, the at least one second CC being a CC that coincides with the target reference signal bandwidth portion; and
determine that the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion when the at least one first CC and the at least one second CC are the same.
9. The network entity of claim 1 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first band for the source reference signal, and
the one or more processors, either alone or in combination, are configured to:
determine at least one second band based on the target reference signal bandwidth portion, the at least one second band being a band that coincides with the target reference signal bandwidth portion; and
determine that the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion when the at least one first band and the at least one second band are the same.
10. A method of a network entity, the method comprising:
defining a first set of configuration information for a source reference signal having a source reference signal bandwidth portion defined by a source reference signal start frequency and a source reference signal bandwidth size of one or more first physical resource blocks, wherein the source reference signal is a downlink reference signal;
defining a second set of configuration information for a target reference signal having a target reference signal bandwidth portion defined by a target reference signal start frequency and a target reference signal bandwidth size of one or more second physical resource blocks, wherein the target reference signal is a downlink positioning reference signal; and
transmitting the first and second sets of configuration information for configuring a user equipment (UE), wherein the first and second sets of configuration information indicate a quasi-co-location (QCL) relationship between the source reference signal and the target reference signal, and wherein the QCL relationship is based on a transmitting transmission-reception point (TRP) and the source reference signal bandwidth portion and the target reference signal bandwidth portion being a same bandwidth portion.
11. The method of claim 10 , wherein the network entity is one of a location server, location management function, or a serving TRP.
12. The method of claim 10 , wherein the source reference signal is a QCL source for the target reference signal with respect to Doppler shift, Doppler spread, average delay, delay spread, spatial receive parameter, or any combination thereof.
13. The method of claim 10 , wherein:
the source reference signal is one of a first downlink positioning reference signal (DL-PRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS), and
the target reference signal is a second DL-PRS.
14. The method of claim 10 , wherein:
the source reference signal and the target reference signal are transmitted from the transmitting TRP when the source reference signal and the target reference signal satisfy a frequency layer constraint, and
the frequency layer constraint specifies that a first frequency layer is the same as a second frequency layer, the first frequency layer being a frequency layer of the source reference signal, and the second frequency layer being a frequency layer of the target reference signal.
15. The method of claim 10 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first component carrier (CC), at least one first band, and/or at least one first bandwidth part (BWP) of the source reference signal, and
the method further comprises:
determining the source reference signal bandwidth portion based on the at least one first CC, the at least one first band, and/or the at least one first BWP prior to a determination of whether the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion.
16. The method of claim 15 , wherein the source reference signal is a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB).
17. The method of claim 10 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first CC of the source reference signal, and
the method further comprising:
determining at least one second CC based on the target reference signal bandwidth portion, the at least one second CC being a CC that coincides with the target reference signal bandwidth portion; and
determining that the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion when the at least one first CC and the at least one second CC are the same.
18. The method of claim 10 , wherein:
the source reference signal is configured through a frequency domain container specifying at least one first band for the source reference signal, and
the method further comprises:
determining at least one second band based on the target reference signal bandwidth portion, the at least one second band being a band that coincides with the target reference signal bandwidth portion; and
determining that the source reference signal bandwidth portion and the target reference signal bandwidth portion are the same bandwidth portion when the at least one first band and the at least one second band are the same.
19. A network entity, comprising:
means for defining a first set of configuration information for a source reference signal having a source reference signal bandwidth portion defined by a source reference signal start frequency and a source reference signal bandwidth size of one or more first physical resource blocks, wherein the source reference signal is a downlink reference signal;
means for defining a second set of configuration information for a target reference signal having a target reference signal bandwidth portion defined by a target reference signal start frequency and a target reference signal bandwidth size of one or more second physical resource blocks, wherein the target reference signal is a downlink positioning reference signal; and
means for transmitting the first and second sets of configuration information for configuring a user equipment (UE), wherein the first and second sets of configuration information indicate a quasi-co-location (QCL) relationship between the source reference signal and the target reference signal, and wherein the QCL relationship is based on a transmitting transmission-reception point (TRP) and the source reference signal bandwidth portion and the target reference signal bandwidth portion being a same bandwidth portion.
20. A non-transitory computer-readable medium storing computer-executable instructions for a network entity, the computer-executable instructions comprising:
one or more instructions instructing the network entity to define a first set of configuration information for a source reference signal having a source reference signal bandwidth portion defined by a source reference signal start frequency and a source reference signal bandwidth size of one or more first physical resource blocks, wherein the source reference signal is a downlink reference signal;
one or more instructions instructing the network entity to define a second set of configuration information for a target reference signal having a target reference signal bandwidth portion defined by a target reference signal start frequency and a target reference signal bandwidth size of one or more second physical resource blocks, wherein the target reference signal is a downlink positioning reference signal; and
one or more instructions instructing the network entity to transmit the first and second sets of configuration information for configuring a user equipment (UE), wherein the first and second sets of configuration information indicate a quasi-co-location (QCL) relationship between the source reference signal and the target reference signal, and wherein the QCL relationship is based on a transmitting transmission-reception point (TRP) and the source reference signal bandwidth portion and the target reference signal bandwidth portion being a same bandwidth portion.