Patent ID: 11917687
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method performed by a base station, the method comprising:
transmitting information to a wireless device, the information indicating whether a many-to-one association exists between (a) a downlink signal that the wireless device uses for beam selection prior to a random access procedure, and (b) physical random access channel (PRACH) preamble indices;
transmitting one or more of the downlink signals that the wireless device uses for beam selection prior to the random access procedure;
receiving a PRACH preamble from the wireless device;
applying a transmitter configuration for transmitting an access response to the received PRACH preamble, the transmitter configuration based at least in part on whether the many-to-one association exists and on the received PRACH preamble,
wherein applying the transmitter configuration comprises configuring the transmitter to use TX precoding weights, when transmitting the access response, that focus the access response energy in a direction of the PRACH preamble reception if the mapping between the downlink signal and the PRACH preamble indices comprises the many-to-one association,
wherein, when the many-to-one association exists between the downlink signal and the PRACH preamble indices, the transmitter configuration transmits with spatial correspondence between the access response and the received PRACH preamble, and
wherein the spatial correspondence uses a preferred PRACH settings to configure the access response transmission.