# US 2019/0357261 A1 · Random Access Procedures Using Multiple Active Bandwidth Parts > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0357261 A1 - Document ID: US20190357261A1 - Status: Published application - Kind: A1 - Application number: 16/418,411 - Filed: 2019-05-21 - Published: 2019-11-21 - Earliest claimed: 2018-05-21 - Assignees: Comcast Cable Communications, LLC - Applicants: Comcast Cable Communications, LLC - Inventors: Ali Cirik; Esmael Hejazi Dinan; Hua Zhou; Hyoungsuk Jeon; Alireza Babaei; Kyungmin Park - Web page: https://patentgrep.com/patent/US20190357261A1 ## CPC - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 72/04: Wireless resource allocation - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/02: Hybrid access - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/11: Allocation or use of connection identifiers - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 80/02: Data link layer protocols - H04W 74/0836: with 2-step access - H04W 74/0838: using contention-free random access [CFRA] - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Wireless communications using multiple active resources (e.g., bandwidth parts (BWP)) are described. A predetermined rule may be used to determine on which downlink (DL) BWP of multiple active DL BWPs, and/or on which uplink (UL) BWP of multiple active UL BWPs, a message is to be sent. A wireless device and/or a base station may reduce the quantity of active DL BWPs and/or active UL BWPs to monitor for a response. ## Claims ### Claim 1 A method comprising: receiving, by a wireless device, one or more configuration parameters for downlink BWPs and for uplink BWPs; activating at least two downlink BWPs of the downlink BWPs and a first uplink BWP of the uplink BWPs; initiating a random access procedure via the first uplink BWP; determining that each of a downlink BWP-specific index of the at least two downlink BWPs is different from an uplink BWP-specific index of the first uplink BWP; determining, based on the determining that each downlink BWP-specific index is different from each of an uplink BWP-specific index of the first uplink BWP, a first downlink BWP of the at least two downlink; switching from the first downlink BWP to a second downlink BWP, of the downlink BWPs, associated with a second downlink BWP-specific index that is the same as the uplink BWP-specific index; and sending, via the first uplink BWP, a preamble. ### Claim 2 (depends on 1) The method of claim 1, further comprising: activating the second downlink BWP; and monitoring at least one downlink control channel of the second downlink BWP for a random access response. ### Claim 3 (depends on 1) The method of claim 1, wherein the activating the at least two downlink BWPs and the first uplink BWP comprises: activating the first downlink BWP in a first slot; activating the second downlink BWP in a second slot; and activating the first uplink BWP in a third slot, wherein each of the first slot, the second slot, and the third slot are different slots. ### Claim 4 (depends on 1) The method of claim 1, wherein the determining the first downlink BWP comprises determining a downlink BWP associated with at least one of: a lowest or highest downlink BWP-specific index relative to downlink BWP-specific indexes associated with the at least two downlink BWPs; or a lowest or highest BWP-specific numerology relative to BWP-specific numerologies associated with the at least two downlink BWPs. ### Claim 5 (depends on 1) The method of claim 1, wherein the determining the first downlink BWP comprises determining a downlink BWP based on whether the first downlink BWP is a primary BWP or a secondary BWP. ### Claim 6 (depends on 1) The method of claim 1, wherein the determining the first downlink BWP comprises determining a downlink BWP based on whether the first downlink BWP is a default BWP or a non-default BWP. ### Claim 7 (depends on 1) The method of claim 1, wherein the switching from the first downlink BWP to the second downlink BWP comprises maintaining the first downlink BWP in an active state. ### Claim 8 (depends on 1) The method of claim 1, wherein the switching from the first downlink BWP to the second downlink BWP comprises deactivating the first downlink BWP. ### Claim 9 A method comprising: receiving, by a wireless device, one or more configuration parameters comprising: downlink bandwidth part (BWP)-specific indexes for downlink BWPs; and uplink BWP-specific indexes for uplink BWPs; activating a first downlink BWP of the downlink BWPs and a first uplink BWP of the uplink BWPs; initiating a random access procedure via the first uplink BWP; determining that a downlink BWP-specific index of the first downlink BWP is different from an uplink BWP-specific index of the first uplink BWP; based on the determining, activating a second downlink BWP, of the downlink BWPs, associated with a second downlink BWP-specific index that is the same as the uplink BWP-specific index; and sending, via the first uplink BWP, a preamble. ### Claim 10 (depends on 9) The method of claim 9, further comprising: monitoring at least one downlink control channel of the second downlink BWP for a random access response; and based on the activating the second downlink BWP, deactivating the first downlink BWP. ### Claim 11 (depends on 9) The method of claim 9, wherein the activating the first downlink BWP, the first uplink BWP, and the second BWP comprises: activating the first downlink BWP in a first slot; activating the second downlink BWP in a second slot; and activating the first uplink BWP in a third slot, wherein each of the first slot, the second slot, and the third slot are different slots. ### Claim 12 (depends on 9) The method of claim 9, further comprising determining the first downlink BWP from the downlink BWPs by determining a downlink BWP associated with at least one of: a lowest or highest downlink BWP-specific index relative to downlink BWP-specific indexes associated with the downlink BWPs; or a lowest or highest BWP-specific numerology relative to BWP-specific numerologies associated with the downlink BWPs. ### Claim 13 (depends on 9) The method of claim 9, further comprising determining the first downlink BWP based on whether the first downlink BWP is a primary BWP or a secondary BWP. ### Claim 14 (depends on 9) The method of claim 9, further comprising determining the first downlink BWP based on whether the first downlink BWP is a default BWP or a non-default BWP. ### Claim 15 (depends on 9) The method of claim 9, further comprising switching from the first downlink BWP to the second downlink BWP. ### Claim 16 (depends on 15) The method of claim 15, wherein the switching from the first downlink BWP to the second downlink BWP comprises deactivating the first downlink BWP. ### Claim 17 A method comprising: receiving, by a wireless device, one or more configuration parameters comprising: downlink bandwidth part (BWP)-specific indexes for downlink BWPs; and uplink BWP-specific indexes for uplink BWPs; activating a first downlink BWP of the downlink BWPs and a first uplink BWP of the uplink BWPs; initiating a random access procedure via the first uplink BWP; determining that a downlink BWP-specific index of the first downlink BWP is different from an uplink BWP-specific index of the first uplink BWP; and based on the determining, performing at least one of: activating a second downlink BWP, of the downlink BWPs, associated with a second downlink BWP-specific index that is the same as the uplink BWP-specific index; deactivating the first downlink BWP; or switching from the first downlink BWP to the second downlink BWP. ### Claim 18 (depends on 17) The method of claim 17, wherein the performing is based on at least one of: a downlink BWP-specific index of the first downlink BWP; a BWP-specific numerology of the first downlink BWP; a downlink BWP-specific index of the second downlink BWP; or a BWP-specific numerology of the second downlink BWP. ### Claim 19 (depends on 17) The method of claim 17, further comprising: receiving, via the at least one downlink control channel of the second downlink BWP, a random access response; and based on the receiving the random access response, switching from the first downlink BWP to the second downlink BWP. ### Claim 20 (depends on 17) The method of claim 17, wherein the initiating the random access procedure comprises: receiving a physical downlink control channel (PDCCH) order; and based on the PDCCH order, sending a random access preamble via the first uplink BWP.