System information for access and backhaul
Methods, systems, and devices for wireless communications are described that provide for system information (SI) for access and backhaul. An access node (AN) may provide SI to devices within its cell indicating communication procedure configurations. The AN may provide SI to devices that is specific to whether the communication procedure is an access procedure or a backhaul procedure. The AN may transmit a common master information block (MIB) directing the devices within its cell to a search space in order to receive the remaining SI. The search space may be shared between access devices and backhaul devices or alternatively may be separate between access and backhaul devices. The remaining SI may not be shared between access and backhaul devices. The devices may determine different configurations as defined by the SI from the AN for communications procedures based on whether the procedure is an access procedure or a backhaul procedure.
1. A method for wireless communications, comprising:
receiving, at a relay device in a wireless network, a broadcast channel from a network node that includes a common master information block (MIB);
determining a backhaul control resource set (CORESET) or a backhaul search space for communications with the network node based at least in part on the common MIB;
monitoring the backhaul CORESET or the backhaul search space for a backhaul-specific SI radio network temporary identifier (SI-RNTI);
receiving, at the relay device, a backhaul system information (SI) configuration from the network node in the wireless network;
determining, based at least in part on the backhaul SI configuration, backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from access SI used by one or more wireless devices to access a cell supported by the relay device; and
accessing the network node or the other network node based at least in part on the backhaul SI, the access SI, or both.
2. The method of claim 1 , wherein at least one of the relay device and the network node is an integrated access backhaul (IAB) node.
3. The method of claim 1 , wherein the network node is an anchor node or an integrated access backhaul (IAB) donor node.
4. The method of claim 1 , wherein determining the backhaul SI comprises:
monitoring a second backhaul search space and a second backhaul control resource set (CORESET) indicated by the backhaul SI configuration for the backhaul-specific (SI-RNTI).
5. The method of claim 4 , wherein the backhaul SI configuration indicates one or both of a search space and control resource set (CORESET) for an SI grant.
6. The method of claim 5 , further comprising:
receiving, based at least in part on the backhaul SI configuration, a physical downlink control channel (PDCCH) conveying the SI grant, wherein the SI grant schedules an SI message via physical downlink shared channel (PDSCH).
7. The method of claim 6 , wherein receiving the PDCCH comprises:
descrambling one or more cyclic redundancy check (CRC) bits using an access SI-RNTI.
8. The method of claim 4 , further comprising:
receiving, at the relay device, a synchronization signal (SS) that indicates the access SI.
9. The method of claim 4 , further comprising:
receiving, at the relay device, an access SI configuration that indicates an access search space and an access CORESET; and
monitoring the access search space and the access CORESET for an access-specific SI-RNTI.
10. The method of claim 9 , wherein the access-specific SI-RNTI and the backhaul-specific SI-RNTI are different.
11. The method of claim 9 , wherein at least a portion of the backhaul search space is the same as at least a portion of the access search space.
12. The method of claim 9 , wherein at least a portion of the backhaul CORESET is the same as at least a portion of the access CORESET.
13. The method of claim 9 , wherein at least a portion of the backhaul search space is different than at least a portion of the access search space.
14. The method of claim 9 , wherein at least a portion of the backhaul CORESET is different than at least a portion of the access CORESET.
15. The method of claim 1 , further comprising:
transmitting, to the network node or another network node, a first random access message based at least in part on the backhaul SI.
16. The method of claim 1 , wherein the backhaul SI comprises the backhaul-specific SI-RNTI, an access-specific SI-RNTI for the access SI, or a combination thereof.
17. The method of claim 1 , wherein the backhaul SI comprises a control resource set (CORESET) or a search space different from the access SI.
18. The method of claim 1 , further comprising:
determining an access CORESET or an access search space based at least in part on the common MIB, wherein the access CORESET is different from the backhaul CORESET or the access search space is different from the backhaul search space; and
transmitting a synchronization signal (SS) that indicates the access SI to one or more devices in the wireless network based at least in part on the access CORESET or the access search space.
19. The method of claim 18 , further comprising:
determining the backhaul CORESET or the backhaul search space based at least in part on a backhaul-specific relationship table that maps the common MIB to the backhaul CORESET or the backhaul search space; and
determining the access CORESET or the access search space based at least in part on an access-specific relationship table that maps the common MIB to the access CORESET or the access search space.
20. The method of claim 1 , further comprising:
determining an access CORESET or an access search space based at least in part on the common MIB, wherein the access CORESET is different from the backhaul CORESET or the access search space is different from the backhaul search space; and
receiving a synchronization signal (SS) that indicates the access SI to one or more devices in the wireless network based at least in part on the access CORESET or the access search space.
21. The method of claim 1 , wherein a content of backhaul-specific remaining minimum SI (RMSI) for a first reference signals (RSs) is different from a content of backhaul-specific RMSI for a second RS that is different from the first RS.
22. An apparatus for wireless communications, comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive, at a relay device in a wireless network, a broadcast channel from a network node that includes a common master information block (MIB);
determine a backhaul control resource set (CORESET) or a backhaul search space for communications with the network node based at least in part on the common MIB;
monitor the backhaul CORESET or the backhaul search space for a backhaul-specific SI radio network temporary identifier (SI-RNTI);
receive, at the relay device, a backhaul system information (SI) configuration from the network node in the wireless network;
determine, based at least in part on the backhaul SI configuration, backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from access SI used by one or more wireless devices to access a cell supported by the relay device; and
access the network node or the other network node based at least in part on the backhaul SI, the access SI, or both.