# US 10,455,624 B2 · Ordered physical random access channel resource management > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,624 B2 - Document ID: US10455624B2 - Status: Granted - Kind: B2 - Application number: 15/591,082 - Filed: 2017-05-09 - Published: 2017-11-16 - Granted: 2019-10-22 - Earliest claimed: 2016-05-13 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Renqiu Wang; Xiao Feng Wang; Hao Xu - Web page: https://patentgrep.com/patent/US10455624B2 ## CPC - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/085: {collision avoidance} - 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 74/06: using polling - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Certain aspects of the present disclosure generally relate to wireless communications and more specifically to transmission resource management for ordered physical random access channel (PRACH) signals. An example method performed by a base station generally includes providing an indication of a set of transmission resources, within a narrowband region of a wider system bandwidth, for transmitting scheduled physical random access channel (PRACH) signals by a first user equipment (UE) and transmitting a command to the first UE to transmit a scheduled PRACH. ## Claims ### Claim 1 A method for wireless communications performed by a base station (BS), comprising: providing an indication of a scheduled physical random access channel (PRACH) region comprising a set of transmission resources for transmitting scheduled PRACH signals by a first user equipment (UE), wherein: the scheduled PRACH region is within a narrowband region of a wider system bandwidth, the scheduled PRACH region is a subset of a set of PRACH resources indicated by the BS, and the indication comprises a parameter indicating a starting offset of the scheduled PRACH region from the set of PRACH resources; and transmitting a first command to the first UE to transmit a scheduled PRACH signal using transmission resources in the scheduled PRACH region. ### Claim 2 (depends on 1) The method of claim 1, further comprising: semi-statically updating the scheduled PRACH region. ### Claim 3 (depends on 2) The method of claim 2, wherein semi-statically updating the scheduled PRACH region comprises semi-statically updating the scheduled PRACH region periodically. ### Claim 4 (depends on 3) The method of claim 3, further comprising: transmitting an indication of a time for the semi-static updating in a system information block (SIB). ### Claim 5 (depends on 1) The method of claim 1, further comprising: determining to command the first UE to transmit the scheduled PRACH signal; and dynamically updating the scheduled PRACH region, based on the determination. ### Claim 6 (depends on 5) The method of claim 5, further comprising: transmitting an indication of the dynamic updating in a system information block (SIB). ### Claim 7 (depends on 1) The method of claim 1, wherein the scheduled PRACH region is a subset of a data transmission resources set. ### Claim 8 (depends on 7) The method of claim 7, further comprising: transmitting an indication that the first UE should disable random group hopping when transmitting the scheduled PRACH signal. ### Claim 9 (depends on 7) The method of claim 7, further comprising: transmitting a second command to a second UE to transmit another scheduled PRACH signal; and postponing transmitting the first command to the first UE until after transmitting the second command to the second UE. ### Claim 10 (depends on 7) The method of claim 7, further comprising: providing a set of guard tones between the scheduled PRACH region and a portion of the data transmission resources set excluding the scheduled PRACH region. ### Claim 11 (depends on 7) The method of claim 7, further comprising: determining to command the first UE to transmit the scheduled PRACH signal; and dynamically updating the scheduled PRACH region, based on the determination. ### Claim 12 (depends on 11) The method of claim 11, wherein the first command indicates a time for the first UE to transmit the scheduled PRACH signal. ### Claim 13 (depends on 7) The method of claim 7, further comprising: semi-statically updating the scheduled PRACH region. ### Claim 14 (depends on 13) The method of claim 13, further comprising: transmitting an indication of a time for the semi-static updating in a system information block (SIB). ### Claim 15 (depends on 1) The method of claim 1, further comprising transmitting the first command after determining once a need for a scheduled PRACH signal. ### Claim 16 A method for wireless communications performed by a user equipment (UE), comprising: receiving a command from a base station (BS) to transmit a scheduled physical random access channel (PRACH) signal to the BS; obtaining an indication of a scheduled PRACH region comprising a set of transmission resources for transmitting scheduled PRACH signals to the BS, wherein: the scheduled PRACH region is within a narrowband region of a wider system bandwidth, the scheduled PRACH region is a subset of a set of PRACH resources indicated by the BS, the indication comprises a parameter indicating a starting offset of the scheduled PRACH region from the set of PRACH resources; and transmitting the PRACH signal to the BS using transmission resources in the scheduled PRACH region. ### Claim 17 (depends on 16) The method of claim 16, wherein the scheduled PRACH region is semi-statically updated. ### Claim 18 (depends on 17) The method of claim 17, wherein the semi-static updating occurs periodically. ### Claim 19 (depends on 18) The method of claim 18, further comprising: receiving an indication of a time for the semi-static updating in a system information block (SIB). ### Claim 20 (depends on 16) The method of claim 16, wherein the scheduled PRACH region is dynamically updated. ### Claim 21 (depends on 20) The method of claim 20, further comprising: receiving an indication of the dynamic updating in a system information block (SIB). ### Claim 22 (depends on 16) The method of claim 16, wherein the scheduled PRACH region is a subset of a data transmission resources set. ### Claim 23 (depends on 22) The method of claim 22, further comprising: obtaining an indication that the UE should disable random group hopping when transmitting the PRACH signal; and wherein transmitting the PRACH signal comprises transmitting the PRACH signal without using group hopping. ### Claim 24 (depends on 16) The method of claim 16, wherein the command indicates a time for the UE to transmit the PRACH signal. ### Claim 25 An apparatus for wireless communications, comprising: at least one processor configured to: provide an indication of a scheduled physical random access channel (PRACH) region comprising a set of transmission resources for transmitting scheduled PRACH signals by a first user equipment (UE), wherein: the scheduled PRACH region is within a narrowband region of a wider system bandwidth, the scheduled PRACH region is a subset of a set of PRACH resources indicated by the BS, the indication comprises a parameter indicating a starting offset of the scheduled PRACH region from the set of PRACH resources; and transmit a first command to the first UE to transmit a scheduled PRACH signal using transmission resources in the scheduled PRACH region; and a memory coupled to the at least one processor. ### Claim 26 An apparatus for wireless communications, comprising: at least one processor configured to: receive a command from a base station (BS) to transmit a scheduled physical random access channel (PRACH) signal to the BS; obtain an indication of a scheduled PRACH region comprising a set of transmission resources for transmitting scheduled PRACH signals to the BS, wherein: the scheduled PRACH region is within a narrowband region of a wider system bandwidth, the scheduled PRACH region is a subset of a set of PRACH resources indicated by the BS, the indication comprises a parameter indicating a starting offset of the scheduled PRACH region from the set of PRACH resources; and transmit the PRACH signal to the BS using transmission resources in the scheduled PRACH region; and a memory coupled to the at least one processor.