# US 11,310,705 B2 · Downlink data coordination based low or 0 ms mobility interruption > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,705 B2 - Document ID: US11310705B2 - Status: Granted - Kind: B2 - Application number: 16/469,451 - Filed: 2018-01-26 - Published: 2020-02-06 - Granted: 2022-04-19 - Earliest claimed: 2017-02-02 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Huichun Liu; Xipeng Zhu; Gavin Bernard Horn; Ruiming Zheng; Yu Zhang; Chao Wei; Ozcan Ozturk; Jae Ho Ryu; Jiming Guo; Peng Cheng - Web page: https://patentgrep.com/patent/US11310705B2 ## CPC - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 36/00725: {Random access channel [RACH]-less handover} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 36/00692: {using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] (allocation of physical resources in CoMP or in CA H04L5/0035)} - H04W 36/08: Reselecting an access point - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract An apparatus for wireless communication, including a memory and at least one processor coupled to the memory. The at least one processor is configured to receive a pre-allocation resource for a target cell via a handover command and transmit a physical layer acknowledgment based on a target cell downlink packet. The at least one processor is also configured to receive an indication for a communication with the target cell in response to the physical layer acknowledgement and access the target cell using the pre-allocated resource based on the indication for the communication with the target cell. ## Claims ### Claim 1 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory, the at least one processor configured to: receive a pre-allocation resource for a target cell via a handover command; transmit a physical layer acknowledgment based on a target cell downlink packet; receive an indication for a communication with the target cell in response to the physical layer acknowledgement; and access the target cell using the pre-allocation resource based on the indication for the communication with the target cell. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the at least one processor is further configured to maintain transmitted and received packets for both a source cell and the target cell based on reception of the handover command. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the at least one processor is further configured to synchronize to the target cell by concurrently receiving from the target cell and a source cell. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the pre-allocation resource includes information to access the target cell directly at a target cell pre-allocated subframe. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the apparatus further comprises a receiver and the processor is further configured to cause the receiver to tune to a frequency of the target cell to receive a physical downlink control channel (PDCCH) from the target cell. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the apparatus further comprises a receiver and the processor is further configured to cause the receiver to tune to a frequency of the target cell to receive a physical downlink shared channel (PDSCH) from the target cell. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the pre-allocation resource includes information for at least one of transmitting a radio resource control (RRC) configuration message to a target evolved Node B (eNB) in the target cell or transmitting a packet data convergence protocol (PDCP) status report to a target eNB in the target cell. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the at least one processor is further configured to receive from a target evolved Node B (eNB) a semi pre-allocated uplink resource physical uplink control channel (PUCCH). ### Claim 9 A method for wireless communication, comprising: receiving a pre-allocation resource for a target cell via a handover command; transmitting a physical layer acknowledgment based on a target cell downlink packet; receiving an indication for a communication with the target cell in response to the physical layer acknowledgement; and accessing the target cell using the pre-allocated resource based on the indication for the communication with the target cell. ### Claim 10 (depends on 9) The method of claim 9, further comprising maintaining transmitted and received packets for both a source cell and the target cell based on reception of the handover command. ### Claim 11 (depends on 9) The method of claim 9, further comprising synchronizing to the target cell by concurrently receiving from the target cell and a source cell. ### Claim 12 (depends on 9) The method of claim 9, wherein the pre-allocation resource includes information for accessing the target cell directly at a target cell pre-allocated subframe. ### Claim 13 (depends on 9) The method of claim 9, further comprising receiving a physical downlink control channel (PDCCH) from the target cell. ### Claim 14 (depends on 9) The method of claim 9, further comprising receiving a physical downlink shared channel (PDSCH) from the target cell. ### Claim 15 (depends on 9) The method of claim 9, wherein the pre-allocation resource includes information for transmitting at least one of a radio resource control (RRC) configuration message to a target evolved Node B (eNB) in the target cell or a packet data convergence protocol (PDCP) status report to a target eNB in the target cell. ### Claim 16 (depends on 9) The method of claim 9, further comprising receiving from a target evolved Node B (eNB) a semi pre-allocated uplink resource physical uplink control channel (PUCCH). ### Claim 17 An apparatus for wireless communication, comprising: means for receiving a pre-allocation resource for a target cell via a handover command; means for transmitting a physical layer acknowledgment based on a target cell downlink packet; means for receiving an indication for a communication with the target cell in response to the physical layer acknowledgement; and means for accessing the target cell using the pre-allocated resource based on the indication for the communication with the target cell. ### Claim 18 (depends on 17) The apparatus of claim 17, further comprising means for maintaining transmitted and received packets for both a source cell and the target cell based on reception of the handover command. ### Claim 19 (depends on 17) The apparatus of claim 17, further comprising means for synchronizing to the target cell by concurrently receiving from the target cell and a source cell. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the pre-allocation resource includes information for the apparatus to access the target cell directly at a target cell pre-allocated subframe. ### Claim 21 (depends on 17) The apparatus of claim 17, further comprising means for causing a receiver to tune to receive a physical downlink control channel (PDCCH) from the target cell. ### Claim 22 (depends on 17) The apparatus of claim 17, further comprising means for causing a receiver to tune to receive a physical downlink shared channel (PDSCH) from the target cell. ### Claim 23 (depends on 17) The apparatus of claim 17, wherein the pre-allocation resource includes information for transmitting at least one of s radio resource control (RRC) configuration message to a target evolved Node B (eNB) in the target cell or a packet data convergence protocol (PDCP) status report to a target eNB in the target cell. ### Claim 24 (depends on 17) The apparatus of claim 17, further comprising means for receiving from a target evolved Node B (eNB) a semi pre-allocated uplink resource physical uplink control channel (PUCCH). ### Claim 25 A non-transitory, computer-readable medium storing computer executable code for wireless communication, the code when executed by a processor, to cause the processor to: receive a pre-allocation resource for a target cell via a handover command; transmit a physical layer acknowledgment based on a target cell downlink packet; receive an indication for a communication with the target cell in response to the physical layer acknowledgement; and access the target cell using the pre-allocated resource based on the indication for the communication with the target cell. ### Claim 26 (depends on 25) The non-transitory, computer executable code of claim 25, comprising code, when executed by the processor, to further cause the processor to maintain transmitted and received packets for both a source cell and the target cell based on reception of the handover command. ### Claim 27 (depends on 25) The non-transitory, computer executable code of claim 25, comprising code, when executed by the processor, to further cause the processor to synchronize to the target cell by concurrently receiving from the target cell and a source cell. ### Claim 28 (depends on 25) The non-transitory, computer executable code of claim 25, wherein the pre-allocation resource includes information to access the target cell directly at a target cell pre-allocated subframe. ### Claim 29 (depends on 25) The non-transitory, computer executable code of claim 25, further comprising code, when executed by the processor, to further cause the processor to cause a receiver to tune to a frequency of the target cell to receive a physical downlink control channel (PDCCH) from the target cell. ### Claim 30 (depends on 25) The non-transitory, computer executable code of claim 25, further comprising code, when executed by the processor, to further cause the processor to cause a receiver and the processor is further configured to cause the receiver to tune to a frequency of the target cell to receive a physical downlink shared channel (PDSCH) from the target cell.