Synchronization signal blocks for inter-integrated backhaul access (IAB) discovery and measurements
Systems, devices, and techniques for operating Integrated Access and Backhaul (IAB) nodes are described. A described technique includes transmitting, by an IAB-node, first synchronization signal blocks (SSBs) for access user equipment (UEs); and transmitting, by the IAB-node, second SSBs for inter-IAB-node discovery and measurement. The technique can include measuring, by the IAB-node, one or more third SSBs for inter-IAB-node discovery and measurement, and attaching to another IAB-node that is discovered based on the measuring.
1. A method of operating an Integrated Access and Backhaul (IAB) node comprising:
transmitting, by an IAB-node, first synchronization signal blocks (SSBs) for access user equipment (UEs); and
transmitting, by the IAB-node, second SSBs for inter-IAB-node discovery and measurement, wherein transmitting the second SSBs for inter-IAB-node discovery and measurement comprises:
using time-overlapping SSB resources such that different IAB-nodes transmit SSBs for discovery and measurement at overlapping times;
measuring one or more third SSBs for inter-IAB-node discovery and measurement based on a muting pattern in one or more SSB measurement time configuration (SMTC) windows, wherein the IAB-node is among a group of IAB-nodes (N), where N is a number, and a number of SMTC windows configured for measuring of the IAB-nodes is based on N; and
muting transmission of the second SSBs according to the muting pattern when measuring the one or more third SSBs, wherein the muting pattern includes a SSB periodicity of T milliseconds and an inter-IAB SMTC periodicity of N*T milliseconds.
2. The method of claim 1 , wherein the first SSBs and the second SSBs have a same periodicity.
3. The method of claim 1 , wherein the first SSBs and the second SSBs have a different periodicity.
4. The method of claim 1 , wherein the first SSBs and the second SSBs are transmitted on the same frequency raster.
5. The method of claim 1 , wherein the first SSBs and the second SSBs are transmitted on different frequency rasters.
6. The method of claim 1 , wherein each of the second SSBs is confined within a five millisecond half frame.
7. The method of claim 1 , further comprising:
attaching to another IAB-node that is discovered based on the measuring.
8. An apparatus comprising:
one or more processors;
circuitry to communicate with devices comprising one or more user equipment (UEs) and one or more Integrated Access and Backhaul (IAB) nodes; and
a memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
transmitting first synchronization signal blocks (SSBs) for access UEs; and
transmitting, by the IAB-node, second SSBs for inter-IAB-node discovery and measurement, wherein transmitting the second SSBs for inter-IAB-node discovery and measurement comprises:
using time-overlapping SSB resources such that different IAB-nodes transmit SSBs for discovery and measurement at overlapping times;
measuring one or more third SSBs for inter-IAB-node discovery and measurement based on a muting pattern in one or more SSB measurement time configuration (SMTC) windows, wherein the IAB-node is among a group of IAB-nodes (N), where N is a number, and a number of SMTC windows configured for measuring of the IAB-nodes is based on N; and
muting transmission of the second SSBs according to the muting pattern when measuring the one or more third SSBs, wherein the muting pattern includes a SSB periodicity of T milliseconds and an inter-IAB SMTC periodicity of (N+1)*T milliseconds.
9. The apparatus of claim 8 , wherein the first SSBs and the second SSBs have a same periodicity.
10. The apparatus of claim 8 , wherein the first SSBs and the second SSBs have a different periodicity.
11. The apparatus of claim 8 , wherein the first SSBs and the second SSBs are transmitted on the same frequency raster.
12. The apparatus of claim 8 , wherein the first SSBs and the second SSBs are transmitted on different frequency rasters.
13. The apparatus of claim 8 , wherein each of the second SSBs is confined within a five millisecond half frame.
14. The apparatus of claim 8 , the operations further comprising:
attaching to another IAB-node that is discovered based on the measuring.
15. One or more processors to perform operations comprising:
transmitting first synchronization signal blocks (SSBs) for access UEs; and
transmitting, by the IAB-node, second SSBs for inter-IAB-node discovery and measurement, wherein transmitting the second SSBs for inter-IAB-node discovery and measurement comprises:
using time-overlapping SSB resources such that different IAB-nodes transmit SSBs for discovery and measurement at overlapping times;
measuring one or more third SSBs for inter-IAB-node discovery and measurement based on a muting pattern in one or more SSB measurement time configuration (SMTC) windows, wherein the IAB-node is among a group of IAB-nodes (N), where N is a number, and a number of SMTC windows configured for measuring of the IAB-nodes is based on N; and
muting transmission of the second SSBs according to the muting pattern when measuring the one or more third SSBs, wherein the muting pattern includes a SSB periodicity of T milliseconds and an inter-IAB SMTC periodicity of (N+1)*T milliseconds.
16. The apparatus of claim 15 , wherein the first SSBs and the second SSBs have a same periodicity.
17. The apparatus of claim 15 , wherein the first SSBs and the second SSBs have a different periodicity.
18. The apparatus of claim 15 , wherein the first SSBs and the second SSBs are transmitted on the same frequency raster.
19. The apparatus of claim 15 , wherein the first SSBs and the second SSBs are transmitted on different frequency rasters.
20. The apparatus of claim 15 , wherein each of the second SSBs is confined within a five millisecond half frame.
21. The apparatus of claim 15 , the operations further comprising:
attaching to another IAB-node that is discovered based on the measuring.