# US 2020/0288508 A1 · Bandwidth Part Operation for Random Access in RRC Connected Mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288508 A1 - Document ID: US20200288508A1 - Status: Published application - Kind: A1 - Application number: 16/881,465 - Filed: 2020-05-22 - Published: 2020-09-10 - Earliest claimed: 2017-11-28 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Cong Shi; Weijie Xu - Web page: https://patentgrep.com/patent/US20200288508A1 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of initiating a Random Access communication between a 5G User Equipment (UE) and a 5G network node; the method comprising: if the current active UL-BWP of the UE has valid PRACH resources, the UE sending the Random Access Preamble on said current active UL-BWP; and if the current active UL-BWP of the UE has no valid PRACH resources, the UE sending the Random Access Preamble on the initial UL BWP; the method further comprising the UE monitoring the RAR in one of the initial DL-BWP and a default DL-BWP. ## Claims ### Claim 1 A method of initiating a Random Access communication; the method comprising: based on a determination that a current active UpLink BandWidth Part (UL-BWP) of a User Equipment (UE) has valid Physical Random Access Channel (PRACH) resources, the UE sending a Random Access Preamble on the current active UL-BWP; and based on a determination that the current active UL-BWP of the UE has no valid PRACH resources, the UE sending the Random Access Preamble on an initial UL-BWP; and the method further comprising: the UE monitoring a Random Access Response (RAR) in an initial DownLink BandWidth Part (DL-BWP). ### Claim 2 (depends on 1) The method of claim 1, wherein the PRACH resources are defined according to a legacy 3rd Generation Partnership Project (3GPP) standard. ### Claim 3 (depends on 1) The method of claim 1, comprising the UE receiving a definition of the PRACH resources in a System Information Block (SIB) message prior to sending the Random Access Preamble. ### Claim 4 (depends on 1) The method of claim 1, comprising the UE receiving higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble. ### Claim 5 (depends on 1) The method of claim 1, comprising the UE receiving a Random Access Response in reply to the Random Access Preamble on the initial DL-BWP. ### Claim 6 A method of initiating a Random Access communication; the method comprising: a User Equipment (UE) sending a Random Access Preamble on an initial UpLink BandWidth Part (UL-BWP); and the UE monitoring a Random Access Response (RAR) in an initial DownLink BandWidth Part (DL-BWP). ### Claim 7 (depends on 6) The method of claim 6, wherein Physical Random Access Channel (PRACH) resources are defined according to a legacy 3rd Generation Partnership Project (3GPP) standard. ### Claim 8 (depends on 7) The method of claim 7, comprising the UE receiving a definition of the PRACH resources in a System Information Block (SIB) message prior to sending the Random Access Preamble. ### Claim 9 (depends on 6) The method of claim 6, comprising the UE receiving higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble. ### Claim 10 (depends on 6) The method of claim 6, comprising the UE receiving a Random Access Response in reply to the Random Access Preamble on the initial DL-BWP. ### Claim 11 A user equipment, UE, comprising: a memory and a processor, the memory storing one or more computer programs that, when executed by the processor, cause the processor to execute operations of: sending a Random Access Preamble on a current active UpLink BandWidth Part (UL-BWP) when the current active UL-BWP of a User Equipment (UE) has valid Physical Random Access Channel (PRACH) resources; sending the Random Access Preamble on an initial UL-BWP when the current active UL-BWP of the UE has no valid PRACH resources; and monitoring a Random Access Response (RAR) in an initial DownLink BandWidth Part (DL-BWP). ### Claim 12 (depends on 11) The UE of claim 11, wherein the PRACH resources are defined according to a legacy 3rd Generation Partnership Project (3GPP) standard. ### Claim 13 (depends on 11) The UE of claim 11, wherein the processor is further caused to execute an operation of receiving a definition of the PRACH resources in a System Information Block (SIB) message prior to sending the Random Access Preamble. ### Claim 14 (depends on 11) The UE of claim 11, wherein the processor is further caused to execute an operation of receiving higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble. ### Claim 15 (depends on 11) The UE of claim 11, wherein the processor is further caused to execute an operation of receiving a Random Access Response in reply to the Random Access Preamble on the initial DL-BWP. ### Claim 16 A user equipment, UE, comprising: a memory and a processor, the memory storing one or more computer programs that, when executed by the processor, cause the processor to execute operations of: sending a Random Access Preamble on an initial UpLink BandWidth Part (UL-BWP); and monitoring a Random Access Response (RAR) in an initial DownLink BandWidth Part (DL-BWP). ### Claim 17 (depends on 16) The UE of claim 16, wherein Physical Random Access Channel (PRACH) resources are defined according to a legacy 3rd Generation Partnership Project (3GPP) standard. ### Claim 18 (depends on 17) The UE of claim 17, wherein the processor is further caused to execute an operation of receiving a definition of the PRACH resources in a System Information Block (SIB) message prior to sending the Random Access Preamble. ### Claim 19 (depends on 16) The UE of claim 16, wherein the processor is further caused to execute an operation of receiving higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble. ### Claim 20 (depends on 16) The UE of claim 16, wherein the processor is further caused to execute an operation of receiving a Random Access Response in reply to the Random Access Preamble on the initial DL-BWP.