Handover procedures in a wireless communications system
AssigneeQUALCOMM Incorporated
InventorMasato Kitazoe
Life of this patent
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Abstract
Various techniques for handing over a wireless terminal from a serving node to a target node in a radio access network is disclosed. transferring a session in a cluster are disclosed. These techniques include exchanging messages between a wireless terminal and with a serving node to support a handover to a target node. Each of the messages includes an identifier. The wireless terminal is configured to determine whether it has received any stale messages from the target node following handover based on one or more of the identifiers.
Claims20
A wireless terminal, comprising:
- a memory module;
- and
- at least one processor coupled to the memory module, the at least one processor being configured:
- to exchange messages with a serving node to support a handover to a target node in a radio access network, each of the exchanged messages being assigned an identifier comprising sequence numbers, and sequence numbers assigned to uplink messages being independent of sequence numbers assigned to downlink messages;
- to determine whether the wireless terminal has received a stale message when a first handover command message is not received from a serving node, the stale message comprising a second handover command message from the target node transmitted after the handover based on the identifier, and
- to abort a portion of a reconfiguration following an error in the handover when the first handover command message is received from the serving node, the error being based on reconfiguration information received in a downlink message.
A wireless terminal, comprising:
- means for exchanging messages with a serving node to support a handover to a target node in a radio access network, each of the exchanged messages being assigned an identifier comprising sequence numbers, and sequence numbers assigned to uplink messages being independent of sequence numbers assigned to downlink messages;
- means for determining whether the wireless terminal has received a stale message when a first handover command message is not received from a serving node, the stale message comprising a second handover command message from the target node transmitted after the handover based on the identifier;
- and
- means for aborting a portion of a reconfiguration following an error in the handover when the first handover command message is received from the serving node, the error being based on reconfiguration information received in a downlink message.
A method of handing over a wireless terminal from a serving node to a target node in a radio access network, comprising:
- exchanging messages with a serving node to support the handover of the wireless terminal, each of the exchanged messages being assigned an identifier comprising sequence numbers, and sequence numbers assigned to uplink messages being independent of sequence numbers assigned to downlink messages;
- determining whether the wireless terminal has received a stale message when a first handover command message is not received from a serving node, the stale message comprising a second handover command message from the target node transmitted after the handover based on the identifier;
- and
- aborting a portion of a reconfiguration following an error in the handover when the first handover command message is received from the serving node, the error being based on reconfiguration information received in a downlink message.
A non-transitory computer-readable medium for use in a wireless terminal to handover the wireless terminal from a serving node to a target node in a radio access network, the non-transitory computer-readable medium including instructions stored thereon, the instructions comprising:
- program code to exchange messages with a serving node to support the handover of the wireless terminal, each of the exchanged messages being assigned an identifier comprising sequence numbers, and sequence numbers assigned to uplink messages being independent of sequence numbers assigned to downlink messages;
- program code to determine whether the wireless terminal has received a stale message when a first handover command message is not received from a serving node, the stale message comprising a second handover command message from the target node transmitted after the handover based on the identifier;
- and
- program code to abort a portion of a reconfiguration following an error in the handover when the first handover command message is received from the serving node, the error being based on reconfiguration information received in a downlink message.
Dependencies are inferred from the claim text.