Optimizing usage of a coordinated service
In some embodiments, a network node (e.g., a base station) collects information pertaining to components that form a Maximum Received Timing Difference (MRTD). For instance, the network node determines TAE. The network node then evaluates, for a particular UE, whether a certain MRTD requirement (MRTDR) for a specific coordinated service (CS) can be fulfilled. If the requirement can be met, then the network node may initiate the specific CS for the UE (or continue providing the CS), and if the requirement cannot be met, then the network node may stop or modify the CS for the UE.
1. A coordinated services method, the method comprising:
determining a coordinated services type;
based on the determined coordinated services type, selecting a maximum received timing difference requirement (MRTD R ) value that is associated with the determined coordinated services type, wherein the maximum received timing difference requirement (MRTD R ) values represents a maximum received timing difference requirement;
obtaining a first timing alignment error value (TAE- 1 ) indicating a relative timing alignment error between a first transmission and reception point (TRP) and a second TRP; and
determining, based on at least the TAE- 1 and the maximum received timing difference requirement (MRTD R ) value, whether to: initiate a coordinated service for a user equipment (UE) or modify a coordinated service currently being provided to the UE, wherein
determining whether to initiate the coordinated service or modify the coordinated service comprises:
determining, based on at least the TAE- 1 and the MRTD R value, a first value; and
comparing the first value to a first threshold.
2. The method of claim 1 , wherein
the method comprises determining, based on at least the TAE- 1 and the MRTD R value, whether to initiate a coordinated service for the UE, and
the determining comprises determining whether TAE- 1 is less than the MRTD R value.
3. The method of claim 2 , further comprising:
as a result of determining that TAE- 1 is not less than the MRTD R value, obtaining a second timing alignment error value (TAE- 2 ) indicating a timing alignment error between the first TRP and a third TRP; and
determining, based on at least the TAE- 2 and the MRTD R value, whether to initiate the coordinated service for the UE.
4. The method of claim 2 , further comprising:
as a result of determining that TAE- 1 is not less than the MRTD R value, determining not to initiate the coordinated service for the UE.
5. The method of claim 1 , wherein
the first value is a propagation time difference margin (ΔTpropM); and
comparing the first value to the first threshold comprises determining whether ΔTpropM is greater than the first threshold, and
ΔTpropM is a function of (M−TAE- 1 ), wherein M is the MRTD R value.
6. The method of claim 5 , wherein determining the first value comprises determining whether the UE is located within a valid timing area.
7. The method of claim 6 , wherein the determination as to whether the UE is located within the valid timing area is based on at least a pathloss difference and the sign of TAE- 1 .
8. The method of claim 5 , wherein
ΔTpropM=M−TAE- 1 , or
ΔTpropM=M−TAE- 1 −DS-Max, where DS-Max is the maximum of a plurality of channel delay spreads values.
9. The method of claim 1 , further comprising:
obtaining, for a channel between the first TRP and the UE, a first channel delay spread value (DS- 1 );
obtaining, for a channel between the second TRP and the UE, a second channel delay spread value (DS- 2 );
determining DS-Max, wherein, if DS- 1 is greater than DS- 2 , then DS-Max is greater than or equal to DS- 1 , wherein
the method comprises determining, based on at least the TAE- 1 , DS-Max, and the MRTD R value, whether to: initiate a coordinated service for the UE or modify a coordinated service currently being provided to the UE.
10. The method of claim 9 , further comprising selecting a beam direction based on both a link quality associated with the beam and a channel delay spread value associated with the beam.
11. The method of claim 1 , further comprising determining a potential network improvement based on a processing for statistics for MRTD budgets and service attempts.
12. The method of claim 1 , further comprising determining a propagation time difference (ΔTprop), wherein
the first value is determined using ΔTprop, TAE- 1 and the MRTD R value.
13. The method of claim 12 , wherein
the first value is E, wherein E=M−TAE- 1 −ΔTprop, and wherein
M is the MRTD R value.
14. The method of claim 12 , wherein
the first value is E, wherein E=M−TAE- 1 −ΔTprop−DS, and wherein DS is a channel delay spread value
and M is the MRTD R value.
15. The method of claim 12 , wherein determining ΔTprop comprises:
obtaining a first timing advance (TA) value (TA BS-A ) and a second timing advance (TA) value (TA BS-B ) and calculating ΔTprop=(TA BS-A −TA BS-B )/2, or
determining ΔTprop based on pathloss estimates.
16. The method of claim 1 , wherein the method comprises determining, based on at least the TAE- 1 and the MRTD R value, whether to initiate the coordinated service for the UE.
17. A network node for optimizing coordinated services, the network node comprising:
a data storage system; and
processing circuitry coupled to the data storage system, wherein the network node is configured to:
obtain a maximum received timing difference requirement (MRTD R ) value representing a maximum received timing difference requirement;
obtain a first timing alignment error value (TAE- 1 ) indicating a relative timing alignment error between a first transmission and reception point (TRP) and a second TRP; and
determine, based on at least the TAE- 1 and the MRTD R value, whether to: initiate a coordinated service for a user equipment (UE) or modify a coordinated service currently being provided to the UE, wherein
determining whether to: initiate the coordinated service or modify the coordinated service comprises:
determining, based on at least the TAE- 1 and the MRTD R value, a first value; and
comparing the first value to a first threshold, and
the network node is configured to obtain the MRTD R value by performing a process that includes:
determining a coordinated services type and based on the determined coordinated services type, selecting an MRTD R that is associated with the determined coordinated services type, or
receiving from the UE a message comprising information specifying the MRTD R value and information indicating that the specifying MRTD R value is applicable for the coordinated service.
18. A coordinated services method, the method comprising:
obtaining a maximum received timing difference requirement (MRTD R ) value representing a maximum received timing difference requirement;
obtaining a first timing alignment error value (TAE- 1 ) indicating a relative timing alignment error between a first transmission and reception point (TRP) and a second TRP; and
determining, based on at least the TAE- 1 and the MRTD R value, whether to: initiate a coordinated service for a user equipment (UE) or modify a coordinated service currently being provided to the UE, wherein
obtaining the maximum received timing difference requirement (MRTD R ) value comprises receiving from the UE a message comprising [i] information specifying the MRTD R value and [ii] information indicating that the specified MRTD R value is applicable for the coordinated service, and
determining, based on at least the TAE- 1 and the MRTD R value, whether to: initiate a coordinated service for a user equipment (UE) or modify a coordinated service currently being provided to the UE comprises:
determining, based on at least the TAE- 1 and the MRTD R value, a first value; and
comparing the first value to a first threshold.