Dual active protocol stack (DAPS) handover during URLLC packet duplication
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTorsten Dudda, Pontus Wallentin, Roman Zhohov
Life of this patent
Estimating the term…
Abstract
Techniques for inter base station handovers are provided for the case where a wireless device is operating in a PDCP packet duplication mode. The handover techniques enable the wireless device to transition from PDCP packet duplication with the source cell to DAPS and to transition back to PDCP packet duplication with the target cell when the handover is complete. In some embodiments, the RLC entities established with the source cell are preserved during the inter base station handover. The handover techniques ensure that QoS requirements for URLLC can be met during the inter base station handover.
Claims24
A method of handover performed by a wireless device configured with first and second logical connections for communicating with a source base station, the method comprising:
- receiving a handover command from a source base station while the wireless device is configured to perform packet duplication, wherein the wireless device exchanges duplicate packets with the source base station using the first and second logical connections;
- responsive to the handover command, configuring dual active protocol stacks with the source base station and target base station and moving the second logical connection to a target base station while maintaining the first logical connection to the source base station;
- receiving a release command from the target base station;
- and
- responsive to the release command, configuring the wireless device for packet duplication with the target base station and moving the first logical connection to the target base station.
A method implemented by a source base station to handover a wireless device configured for packet duplication to a target base station, the method comprising:
- determining a need to handover a wireless device;
- sending a handover command to the wireless device to initiate handover to the target base station while the wireless device is configured for packet duplication wherein the wireless device exchanges duplicate packets with the source base station using first and second logical connections;
- and
- maintaining the first logical connection with the wireless device while the wireless device moves the second logical connection to a target base station;
- and
- receiving a handover message from the target base station indicating successful handover;
- and
- responsive to the handover message, releasing the first logical connection with the wireless device.
A method implemented by a target base station to handover a wireless device configured for packet duplication from a source base station, the method comprising:
- receiving a handover request message from the source base station serving a wireless device configured to perform packet duplication wherein the wireless device exchanges duplicate packets with the source base station using first and second logical connections;
- responsive to the handover request message, establishing the second logical connection with the wireless device while the wireless device continues to exchange data with the source base station using the first logical connection;
- sending a release command to the wireless device, the release command including an indication to configure packet duplication for communication with the target base station wherein the wireless device exchanges duplicate packets with the target base station using the first and second logical connections;
- and
- establishing the first logical connection with the wireless device while maintaining the second logical connection to configure the target base station for packet duplication.
A wireless device configured with first and second logical connections for communicating with a source base station, the wireless device comprising:
- communication circuitry for communicating with base stations in a wireless communication network;
- and
- processing circuitry operatively coupled to the communication circuitry and configured to:
- receive a handover command from a source base station while the wireless device is configured to perform packet duplication wherein the wireless device exchanges duplicate packets with the source base station using the first and second logical connections;
- responsive to the handover command, configure dual active protocol stacks with the source base station and target base station and moving the second logical connection to a target base station while maintaining the first logical connection to the source base station;
- receive a release command from the target base station;
- and
- responsive to the release command, configure the wireless device to perform packet duplication for communication with the target base station and moving the first logical connection to the target base station.
A source base station configured to handover a wireless device for packet duplication to a target base station, the source base station comprising:
- communication circuitry for communicating with a wireless device in a wireless communication network;
- and
- processing circuitry operatively coupled to the communication circuitry and configured to:
- determine a need to handover a wireless device;
- send a handover command to the wireless device to initiate handover to the target base station while the wireless device is configured for packet duplication wherein the wireless device exchanges duplicate packets with the source base station using first and second logical connections;
- and
- maintain the first logical connection with the wireless device while the wireless device moves the second logical connection to a target base station;
- and
- receive a handover message from the target base station indicating successful handover;
- and
- responsive to the handover message, release the first logical connection with the wireless device.
A target base station configured to handover wireless device configured for packet duplication from a source base station, the target base station comprising:
- communication circuitry for communicating with a wireless device in a wireless communication network;
- and
- processing circuitry operatively coupled to the communication circuitry and configured to:
- receive a handover request message from the source base station serving a wireless device configured to perform packet duplication wherein the wireless device exchanges duplicate packets with the source base station using first and second logical connections;
- responsive to the handover request message, establish the second logical connection with the wireless device while the wireless device continues to exchange data with the source base station using the first logical connection;
- send a release command to the wireless device, the release command including an indication to configure packet duplication for communication with the target base station wherein the wireless device exchanges duplicate packets with the target base station using the first and second logical connections;
- and
- establish the first logical connection with the wireless device while maintaining the second logical connection to configure the target base station for packet duplication.
Dependencies are inferred from the claim text.