Wireless Communication System Utilizing Staggered Device Handovers
AssigneeBroadcom Corporation
InventorsStephanie PEREIRA, Leena Zacharias, Pavan Nuggehalli, Shao-Cheng Wang, Soumen Chakraborty, Sindhu Verma
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Abstract
Carrier aggregation and dual connectivity allow a user device to communicate with one or more base stations on multiple component carrier frequencies. When it is determined that the user device should handover to a new base station, the user device performs a substantial portion of the needed handover operations with the new base station using only one of the component carrier frequencies. Meanwhile, the user device maintains data communications with the original base station on the remaining component carrier frequencies.
Claims20
A base station, comprising:
- a first radio configured to communicate with a user equipment over a first channel;
- a second radio configured to communicate with the user equipment over a second channel;
- and
- a processor and/or one or more circuits, coupled to the first radio and the second radio, configured to:
- exchange data with the user equipment over both the first channel and the second channel during a normal operation mode;
- analyze the data;
- and
- perform a staggered handover to a target base station based on the data analysis, wherein the processor and/or the one or more circuits is further configured to:
- transmit a Staggered Handover Request message to the target base station;
- and
- halt the exchange of data with the user equipment on only the first channel.
A base station, comprising:
- a first radio configured to communicate over a first channel;
- a second radio configured to communicate over a second channel;
- and
- a processor and/or one or more circuits, coupled to the first radio and the second radio, configured to:
- receive a staggered handover request from a source base station;
- transmit a staggered handover acceptance to the source base station;
- receive synchronization information and preamble information from a user equipment on the first channel;
- transmit, upon receipt of the preamble information, a Preamble Received message to the source base station;
- transmit a Random Access Response (RAR) message to the user equipment on the first channel based on the synchronization information and preamble information;
- and
- after transmitting the RAR message to the user equipment, exchange data with the user equipment on both the first channel and the second channel.
A user equipment (UE), comprising:
- a first radio configured to communicate over a first channel;
- a second radio configured to communicate over a second channel;
- and
- a processor and/or one or more circuits, coupled to the first radio and the second radio, configured to:
- exchange data with a source base station over both the first channel and the second channel during a normal operation mode;
- receive a staggered handover notification from the source base station;
- and
- perform a staggered handover to a target base station based on the staggered handover notification, wherein the processor and/or the one or more circuits is further configured to:
- transmit synchronization information and preamble information to the target base station on the first channel;
- exchange data with the source base station on the second channel during transmission of the synchronization information and the preamble information;
- receive a Random Access Response (RAR) message from the target base station;
- reconfigure the first radio according to the RAR message;
- and
- exchange data with the target base station over the first channel after completion the reconfiguration.
Dependencies are inferred from the claim text.