Method and UE for controlling 2-step and 4-step RACH procedure in a wireless network

Patent metadata

Field	Value
Publication number	US-12185380-B2
Application number	US-202217667892-A
Country	US
Kind code	B2
Filing date	Feb 9, 2022
Priority date	Feb 10, 2021
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

A method for random access channel (RACH) procedure in a wireless network by a user equipment (UE) is provided. The method includes determining a plurality of signal condition parameters associated with the UE. Further, the method includes determining whether at least one signal condition parameter of the plurality of signal condition parameters meets at least one signal condition threshold from a plurality of signal condition thresholds. Further, the method includes triggering one of a 2-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters meets the at least one signal condition threshold, or a 4-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters does not meet the at least one signal condition threshold.

First claim

The invention claimed is:

1. A method for controlling a random access channel (RACH) procedure in a wireless network, the method comprising:
determining, by a user equipment (UE), a plurality of signal condition parameters associated with the UE;
determining, by the UE, whether at least one signal condition parameter of the plurality of signal condition parameters meets at least one signal condition threshold from a plurality of signal condition thresholds; and
triggering, by the UE, one of:
a 2-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters meets the at least one signal condition threshold, or
a 4-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters does not meet the at least one signal condition threshold,

wherein the plurality of signal condition parameters comprises a reference signal received power (RSRP) of the UE and at least one of a reference signal received quality (RSRQ) of the UE, a signal to interference and noise ratio (SINR) of the UE, or a pathloss at the UE.

2. The method as claimed in claim 1 , wherein the plurality of signal condition parameters further comprises at least one of:
a block error rate (BLER) of the UE,
a channel quality index (CQI) estimated in a radio resource control (RRC) connected mode of the UE,
a physical layer (L1) or layer 2 (L2) down link (DL) or uplink (UL) BLER of the UE,
a transmission (Tx) power of the UE,
a type of service,
a transceiver resource manager module (TRM) switch requirement, or
a wireless fidelity (WiFi) connectivity status of the UE.

3. The method as claimed in claim 1 , wherein the determining, by the UE, of the plurality of signal condition parameters associated with the UE comprises:
determining, by the UE, whether the RSRP of the UE meets a RSRP threshold; and
determining, by the UE, the plurality of signal condition parameters associated with the UE in response to determining that the RSRP of the UE meets the RSRP threshold.

4. The method as claimed in claim 2 , wherein each signal condition of the plurality of signal condition thresholds is locally defined at the UE, the plurality of signal condition thresholds comprising at least one of:
a RSRP threshold remotely configured by a base station at the UE and a RSRQ threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a SINR threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a pathloss threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a CQI threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a block error rate (BLER) threshold locally configured by the UE,
a RSRQ threshold locally configured by the UE,
a SINR threshold locally configured by the UE,
a pathloss threshold locally configured by the UE,
a CQI threshold locally configured by the UE, wherein the CQI is estimated in a radio resource control (RRC) connected mode of the UE,
a physical layer (L1) or layer 2 (L2) down link (DL) or uplink (UL) BLER threshold locally configured by the UE,
a transmission (Tx) power threshold locally configured by the UE or at maximum transmit power limit (MTPL),
a type of service is one of call service, data service, or a critical and delay intolerant service, or
a transceiver resource manager module (TRM) switch is needed for a high priority task on another subscriber identity module (SIM) stack of the UE or the TRM switch is needed while a priority task is ongoing on a current SIM stack of the UE.

5. The method as claimed in claim 1 , further comprising:
detecting, by the UE, whether the RACH procedure is triggered on a leg where 2-step RACH is configured on either a master cell group (MCG) or a secondary cell group (SCG), while the UE is in a dual connectivity (DC) mode; and
performing, by the UE, one of:
revising dynamic power sharing thresholds to increase maximum transmit power limit (MTPL) or an actual Tx power limit on the leg where the 2-step RACH is configured, in response to determining that the RACH procedure is triggered on the leg where the 2-step RACH is configured, or
maintaining default dynamic power sharing thresholds, in response to determining that the RACH procedure is not triggered on the leg where the 2-step RACH is configured.

6. The method as claimed in claim 1 , further comprising:
detecting, by the UE, that the triggered 2-step RACH procedure has failed; and
triggering, by the UE, the 4-step RACH procedure.

7. A user equipment (UE) for a random access channel (RACH) procedure in a wireless network, the UE comprising:
a memory;
a processor; and
a RACH procedure controller, connected to the memory and the processor, configured to:
determine a plurality of signal condition parameters associated with the UE,
determine whether at least one signal condition parameter of the plurality of signal condition parameters meets at least one signal condition threshold from a plurality of signal condition thresholds, and
trigger one of:
a 2-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters meets the at least one signal condition threshold, or

a 4-step RACH procedure in response to determining that the at least one signal condition parameter of the plurality of signal condition parameters does not meet the at least one signal condition threshold,

wherein the plurality of signal condition parameters comprises a reference signal received power (RSRP) of the UE and at least one of a reference signal received quality (RSRQ) of the UE, a signal to interference and noise ratio (SINR) of the UE, or a pathloss at the UE.

8. The UE as claimed in claim 7 , wherein the plurality of signal condition parameters further comprises at least one of:
a block error rate (BLER) of the UE,
a channel quality index (CQI) estimated in a radio resource control (RRC) connected mode of the UE,
a physical layer (L1) or layer 2 (L2) down link (DL) or uplink (UL) BLER of the UE,
a transmission (Tx) power of the UE,
a type of service,
a transceiver resource manager module (TRM) switch requirement, or
a wireless fidelity (WiFi) connectivity status of the UE.

9. The UE as claimed in claim 7 , wherein to determine the plurality of signal condition parameters associated with the UE, the RACH procedure controller is further configured to:
determine whether the RSRP of the UE meets a RSRP threshold, and
determine the plurality of signal condition parameters associated with the UE, in response to determining that the RSRP of the UE meets the RSRP threshold.

10. The UE as claimed in claim 8 , wherein each signal condition threshold of the plurality of signal condition thresholds is locally defined at the UE, the plurality of signal condition thresholds comprising at least one of:
a RSRP threshold remotely configured by a base station at the UE and a reference signal received quality (RSRQ) threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a SINR threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a pathloss threshold locally configured by the UE,
a RSRP threshold remotely configured by the base station at the UE and a CQI threshold locally configured by the UE,
a RSRP threshold remotely configured by a base station at the UE and a

Assignees

• Samsung Electronics Co Ltd

Inventors

• Nagarajan Shanthossh
• Agarwal Rishav
• Sreenivas Shreyas

Classifications

• H04W74/0833 Primary

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

• H04W74/0836

  with 2-step access · CPC title