Signal designs for densely deployed network
Aspects of the present disclosure relate to techniques that may be utilized in networks with relatively dense deployments of nodes, such as remote radio heads (RRHs) and UE relays.
1. A method for wireless communications by a node belonging to a cluster of cells having a macro node and one or more other type nodes, comprising:
transmitting a tertiary synchronization signal (TSS) that uniquely identifies the node within the cluster, wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS), wherein the TSS is linked to the PSS and SSS, such that a user equipment (UE) may determine the PSS and SSS from the TSS.
2. The method of claim 1 , further comprising transmitting the PSS and SSS.
3. The method of claim 1 , wherein:
the PSS and SSS allow a first type of UE with a first capability to identify the cluster; and
the PSS, SSS, and TSS allow a second type of UE to identify the cluster and uniquely identify the node.
4. The method of claim 1 , wherein the TSS is generated with a scrambling code that is a function of PSS and SSS.
5. The method of claim 1 , wherein different nodes in the cluster transmit respective TSSs at different periodicity.
6. The method of claim 1 , wherein TSS is transmitted less often than PSS and SSS.
7. The method of claim 1 , wherein transmitting TSS is conditioned upon detecting an event.
8. The method of claim 7 , wherein the event comprises detecting a signal transmitted from a user equipment (UE).
9. The method of claim 1 , wherein different nodes transmit their respective TSS using at least one of different time resources or different frequency resources.
10. The method of claim 1 , wherein a particular node is uniquely identified by at least one of:
location of frequency and/or time resources used to transmit the TSS;
a particular sequence used;
a shift of a common sequence available to other nodes;
a scrambling code used in generating the TSS;
which antenna ports are used to transmit the TSS; or
density of antenna ports used to transmit TSS.
11. A method for wireless communications by a user equipment (UE) within a cluster of cells having a macro node and one or more other type nodes, comprising:
detecting a tertiary synchronization signal (TSS), wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS);
determining the PSS and SSS from the TSS; and
identifying a node within the cluster that transmitted the TSS.
12. The method of claim 11 , further comprising:
receiving the PSS and SSS; and
identifying the cluster based on the PSS and SSS.
13. The method of claim 11 , wherein:
the PSS and SSS allow a first type of UE with a first capability to identify the cluster; and
the PSS, SSS, and TSS allow a second type of UE to identify the cluster and uniquely identify the node.
14. The method of claim 11 , wherein the TSS is generated with a scrambling code that is a function of PSS and SSS.
15. The method of claim 11 , wherein different nodes in the cluster transmit respective TSSs at different periodicity.
16. The method of claim 11 , wherein TSS is transmitted less often than PSS and SSS.
17. The method of claim 11 , wherein different nodes transmit their respective TSS using at least one of different time resources or different frequency resources.
18. The method of claim 11 , wherein the UE uniquely identifies the node by at least one of:
location of frequency and/or time resources used to transmit the TSS;
a particular sequence used;
a shift of a common sequence available to other nodes;
a scrambling code used in generating the TSS;
which antenna ports are used to transmit the TSS; or
density of antenna ports used to transmit TSS.
19. The method of claim 11 , further comprising performing at least one of:
reference signal receive power (RSRP) measurement based on the TSS; or
path loss (PL) measurement based on the TSS.
20. An apparatus for wireless communications by a node belonging to a cluster of cells having a macro node and one or more other type nodes, comprising:
means for transmitting a tertiary synchronization signal (TSS) that uniquely identifies the node within the cluster, wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS), wherein the TSS is linked to the PSS and SSS, such that a user equipment (UE) may determine the PSS and SSS from the TSS.
21. An apparatus for wireless communications by a user equipment (UE) within a cluster of cells having a macro node and one or more other type nodes, comprising:
means for detecting a tertiary synchronization signal (TSS), wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS);
means for determining the PSS and SSS from the TSS; and
means for identifying a node within the cluster that transmitted the TSS.
22. An apparatus for wireless communications by a node belonging to a cluster of cells having a macro node and one or more other type nodes, comprising:
at least one processor configured to transmit a tertiary synchronization signal (TSS) that uniquely identifies the node within the cluster, wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS), wherein the TSS is linked to the PSS and SSS, such that a user equipment (UE) may determine the PSS and SSS from the TSS; and
a memory coupled with the at least one processor.
23. An apparatus for wireless communications by a user equipment (UE) within a cluster of cells having a macro node and one or more other type nodes, comprising:
at least one processor configured to:
detect a tertiary synchronization signal (TSS), wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS) and identify a node within the cluster that transmitted the TSS; and
determine the PSS and SSS from the TSS; and
a memory coupled with the at least one processor.
24. A non-transitory computer readable medium having instructions stored thereon for wireless communications by a node belonging to a cluster of cells having a macro node and one or more other type nodes, the computer readable medium having instructions stored thereon for:
transmitting a tertiary synchronization signal (TSS) that uniquely identifies the node within the cluster, wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS), wherein the TSS is linked to the PSS and SSS, such that a user equipment (UE) may determine the PSS and SSS from the TSS.
25. A non-transitory computer readable medium having instructions stored thereon for wireless communications by a user equipment (UE) within a cluster of cells having a macro node and one or more other type nodes, the computer readable medium having instructions stored thereon for:
detecting a tertiary synchronization signal (TSS), wherein the cluster is identified by a primary synchronization signal (PSS) and secondary synchronization signal (SSS);
determining the PSS and SSS from the TSS; and
identifying a node within the cluster that transmitted the TSS.
26. The method of claim 1 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
27. The method of claim 11 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
28. The apparatus of claim 20 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
29. The apparatus of claim 21 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
30. The apparatus of claim 22 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
31. The apparatus of claim 23 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
32. The non-transitory computer readable medium of claim 24 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).
33. The non-transitory computer readable medium of claim 25 , wherein the TSS comprises a channel-state information reference signal (CSI-RS).