Random access channel (RACH) process for integrated access and backhaul (IAB) networks

Patent metadata

Field	Value
Publication number	US-12356461-B2
Application number	US-202017774569-A
Country	US
Kind code	B2
Filing date	Oct 29, 2020
Priority date	Nov 8, 2019
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

Performing random access process. In one aspect, there is a method performed by a network function. The method comprises the network function generating system information and the network function broadcasting the system information. The system information comprises i) first power information for use by at least a first set of communication devices and a second set of communication devices in determining a transmit power, and ii) second power information for use by the first set of communication devices, but not the second set of communication devices, in determining the transmit power.

First claim

The invention claimed is:

1. A method performed by a network function, the method comprising:
the network function receiving a random access preamble transmitted on a random access channel;
after receiving the random access preamble, the network function transmitting a random access response identifying at least one uplink resource;
after transmitting the random access response, the network function receiving a combined signal that comprises:
i) a first signal transmitted by a relay node using the uplink resource, the first signal comprising a first message generated by the relay node, and
ii) a second signal transmitted by a user equipment, UE, using the same uplink resource, wherein the second signal comprises a second message;

the network function decoding the first message;
after decoding the first message, the network function producing a modified signal that comprises the second message by removing the decoded first message from the combined signal; and
after producing the modified signal, the network function decoding the second message from the modified signal.

2. The method of claim 1 , wherein
the first message comprises a first identifier for identifying the relay node, and
the second message comprises a second identifier for identifying the UE.

3. The method of claim 2 , further comprising:
after decoding the first message, the network function transmitting to the relay node a first response message that comprises the first identifier that identifies the relay node; and
after decoding the second message, the network function transmitting to the UE a second response message that comprises the second identifier that identifies the UE.

4. The method of claim 3 , wherein
the first message is a Radio Resource Control (RRC) Connection Request, and
the second message is an RRC Connection Request.

5. An apparatus, the apparatus comprising:
memory; and
processing circuitry coupled to the memory, wherein the apparatus is configured to perform a method comprising:
receiving a random access preamble transmitted on a random access channel;
after receiving the random access preamble, transmitting a random access response identifying at least one uplink resource;
after transmitting the random access response, receiving a combined signal that comprises:
i) a first signal transmitted by a relay node using the uplink resource, the first signal comprising a first message generated by the relay node, and
ii) a second signal transmitted by a user equipment, UE, using the same uplink resource, wherein the second signal comprises a second message;

decoding the first message;
after decoding the first message, producing a modified signal that comprises the second message by removing the decoded first message from the combined signal; and
after producing the modified signal, decoding the second message from the modified signal.

6. The apparatus of claim 5 , wherein
the first message comprises a first identifier for identifying the relay node, and
the second message comprises a second identifier for identifying the UE.

7. The apparatus of claim 4 , wherein the method further comprises:
after decoding the first message, transmitting to the relay node a first response message that comprises the first identifier that identifies the relay node; and
after decoding the second message, transmitting to the UE a second response message that comprises the second identifier that identifies the UE.

8. The apparatus of claim 7 , wherein
the first message is a Radio Resource Control (RRC) Connection Request, and
the second message is an RRC Connection Request.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Makki Behrooz
• Dahlman Erik

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W52/36

  with a discrete range or set of values, e.g. step size, ramping or offsets · CPC title

• H04W52/242

  taking into account path loss · CPC title

• H04W52/50

  at the moment of starting communication in a multiple access environment · CPC title

• H04W52/362

  Aspects of the step size · CPC title