IP Library › Granted Patent US 12707466
Granted Patent B2
US 12707466 · App. 18/041,156 · Granted Aug 11, 2026

Beam indication in random access

Inventors: Jan Christoffersson (Luleå, SE); Min Wang (Luleå, SE); Mårten Ericson (Gammelstad, SE)
Assignee: Telefonaktiebolaget LM Ericsson (PUBL)
H04W72/21H04B7/06952H04W74/0833H04W74/0836H04W74/0838
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Quick Facts
Patent No.
US 12707466
App. No.
18/041,156
Granted
Aug 11, 2026
Kind
B2
Abstract

There is disclosed a method performed by a wireless device for indicating a selected beam to a network node within a communication network, the method comprising: transmitting a random-access message comprising a physical uplink shared channel (PUSCH) payload as part of a random-access channel (RACH) procedure to the network node, wherein the PUSCH payload comprises content indicating the beam selected by the wireless device.

Claims (23)

1 . A method performed by a wireless device for indicating a selected beam to a network node within a communication network, the method comprising:

transmitting a random-access message comprising a physical uplink shared channel (PUSCH) payload as part of a random-access channel (RACH) procedure to the network node, wherein the PUSCH payload comprises content indicating the beam selected by the wireless device, and wherein the PUSCH payload comprises N bits dedicated to indicating the selected beam and the N bits are based on a message received from the network node that indicates which beams are transmitted by the network node.

2 . The method of claim 1 , wherein the RACH procedure is a two-step RACH procedure and the message is msgA comprising a RACH preamble and the PUSCH payload.

3 . The method of claim 1 , wherein the RACH procedure is a four-step RACH procedure and the message is Msg3 transmitted on the PUSCH.

4 . The method of claim 1 , wherein the content in the PUSCH payload indicates the selected beam via a synchronization signal block (SSB) index for the SSB associated with the selected beam.

5 . The method of claim 1 , wherein the content in the PUSCH payload indicates the selected beam via a channel state information reference signal (CSI-RS) resource index associated with the selected beam.

6 . The method of claim 1 , wherein the N bits of the PUSCH payload are an N-bit bitmap field that indicates the selected beam and is equal in size to a bitmap field of a message received from the network node that indicates which beams are transmitted by the network node.

7 . The method of claim 6 , the method further comprising:

receiving the message from the network node containing the bitmap field indicating which beams are transmitted by the network node.

8 . The method of claim 6 , wherein the message received from the network node is a radio resource control (RRC) message containing the information element (IE) ssb-PositioninBurst that comprises the bitmap field.

9 . The method of claim 1 , wherein the N bits of the PUSCH payload are an N-bit bitmap field that indicates the selected beam, where the value of N is equal to the number of beams transmitted by the network node as indicated by a bitmap field of a message received from the network node that indicates which beams are transmitted by the network node.

10 . The method of claim 1 , wherein the value of N is equal to the minimum number of bits required to encode the number of beams transmitted by the network node as indicated by a bitmap field of a message received from the network node that indicates which beams are transmitted by the network node.

11 . The method of claim 1 , wherein the content is carried within a media access control (MAC) sub-header of the random-access message.

12 . The method of claim 11 , wherein the content is carried within one or more R-header fields of the MAC sub-header.

13 . The method of claim 1 , wherein the content is carried within a MAC control element (MAC CE).

14 . The method of claim 13 , wherein the MAC CE is dedicated to indicating the beam selected by the wireless device.

15 . The method of claim 1 , wherein the content is carried within an RRC message included in the PUSCH payload.

16 . A wireless device for indicating a selected beam to a network node within a communication network, the wireless device being configured to:

transmit a random-access message comprising a physical uplink shared channel (PUSCH) payload as part of a random-access channel (RACH) procedure to the network node, wherein the PUSCH payload comprises content indicating the beam selected by the wireless device, and wherein the PUSCH payload comprises N bits dedicated to indicating the selected beam and the N bits are based on a message received from the network node that indicates which beams are transmitted by the network node.

17 . A wireless device for indicating a selected beam to a network node within a communication network, the wireless device comprising:

transceiver circuitry;

processing circuitry; and

a memory storing instructions executable by the processing circuitry to cause the wireless device to transmit, via the transceiver circuitry, a random-access message comprising a physical uplink shared channel (PUSCH) payload as part of a random-access channel (RACH) procedure to the network node, wherein the PUSCH payload comprises content indicating the beam selected by the wireless device, and wherein the PUSCH payload comprises N bits dedicated to indicating the selected beam and the N bits are based on a message received from the network node that indicates which beams are transmitted by the network node.