Method and apparatus for efficient handover in LTE

An apparatus for wireless communication handoff, the apparatus comprising:

• means for transmitting a dedicated Random Access Channel (RACH) preamble and cell information;
• means for receiving a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• means for transmitting an uplink grant accompanying a handover message in response to receiving the RACH communication, wherein the means for transmitting the uplink grant comprises means for allocating uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for receiving a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR).

An apparatus for wireless communication handoff, the apparatus comprising:

• at least one processor configured to
• transmit a dedicated Random Access Channel (RACH) preamble and cell information;
• receive a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• transmit at least one of a handover message or an uplink grant in response to receiving the RACH, wherein the processor configured to allocate uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for receiving a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR).

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for transmitting a dedicated Random Access Channel (RACH) preamble and cell information;
• code for receiving a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• code for transmitting at least one of a handover message or an uplink grant in response to receiving the RACH, wherein code for transmitting the uplink grant comprises allocating uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for receiving a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR).

A method for wireless communication handoff, the method comprising:

• receiving target cell information to start handover negotiations;
• initiating communication with a target cell using the target cell information;
• receiving an uplink grant accompanying a handover message from the target cell, wherein the uplink grant comprises an allocation of uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for transmitting a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR);
• and
• using the received information to approximate status reporting.

An apparatus for wireless communication handoff, the apparatus comprising:

• means for receiving target cell information to start handover negotiations;
• means for initiating communication with a target cell using the target cell information;
• means for receiving an uplink grant accompanying a handover message from the target cell, wherein the uplink grant comprises an allocation of uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for transmitting a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR);
• and
• means for using the received information to approximate status reporting.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code receiving target cell information to start handover negotiations;
• code for initiating communication with target cell using the target cell information;
• code for receiving an uplink grant accompanying a handover message, wherein the uplink grant comprises allocating uplink resources based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) in a PDCP queue to allow for transmitting a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR);
• and
• code for using the received information to approximate status reporting.

An apparatus for wireless communication handoff, the apparatus comprising:

• at least one processor configured to
• receive target cell information to start handover negotiations;
• initiate communication with a target cell using the target cell information;
• receive at least one of a handover message comprising a Radio Link Control (RLC) status report or an uplink grant, wherein the uplink grant comprises allocating uplink resources of based on a number of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) for one or more configured Data Radio Bearers (DRBs) to allow for transmitting a PDCP status message for the one or more configured DRBs and a Buffer Status Report (BSR);
• and
• use the received information to approximate status reporting.

A method for wireless communication handoff, the method comprising:

• transmitting, by a target cell, a dedicated Random Access Channel (RACH) preamble and cell information to a source cell;
• receiving, at the target cell, a RACH communication from a user equipment (UE) comprising the dedicated RACH preamble to start communication with the target cell;
• and
• transmitting, by the target cell, a handover message in response to receiving the RACH, wherein transmitting the handover message comprises transmitting the handover message and a radio link control (RLC) status message in a same transmitter time interval (TTI).

An apparatus for wireless communication handoff, the apparatus comprising:

• means for transmitting a dedicated Random Access Channel (RACH) preamble and cell information;
• means for receiving a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• means for transmitting a handover message in response to receiving the RACH communication, wherein the means for transmitting the handover message comprise means for transmitting the handover message and a radio link control (RLC) status message in a same transmitter time interval (TTI).

An apparatus for wireless communication handoff, the apparatus comprising:

• at least one processor configured to:
• transmit a dedicated Random Access Channel (RACH) preamble and cell information;
• receive a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• transmit a handover message in response to receiving the RACH communication, wherein the processor configured to transmit the handover message and a radio link control (RLC) status message in a same transmitter time interval (TTI).

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for transmitting a dedicated Random Access Channel (RACH) preamble and cell information;
• code for receiving a RACH communication from a user equipment (UE) comprising a dedicated preamble to start communication with the apparatus;
• and
• code for transmitting a handover message in response to receiving the RACH, wherein code for transmitting the handover message comprises code for transmitting the handover message and a radio link control (RLC) status message in a same transmitter time interval (TTI).

A method for wireless communication handoff, the method comprising:

• receiving target cell information to start handover negotiations;
• initiating communication with a target cell using the target cell information;
• receiving a handover message comprising a Radio Link Control (RLC) status report in a same transmitter time interval (TTI);
• and
• using the received information to approximate status reporting.

An apparatus for wireless communication handoff, the apparatus comprising:

• means for receiving target cell information to start handover negotiations;
• means for initiating communication with a target cell using the target cell information;
• means for receiving a handover message comprising a Radio Link Control (RLC) status report in a same transmitter time interval (TTI);
• and
• means for using the received information to approximate status reporting.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code receiving target cell information to start handover negotiations;
• code for initiating communication with target cell using the target cell information;
• code for receiving a handover message comprising a Radio Link Control (RLC) status report in a same transmitter time interval (TTI);
• and
• code for using the received information to approximate status reporting.

An apparatus for wireless communication handoff, the apparatus comprising:

• at least one processor configured to
• receive target cell information to start handover negotiations;
• initiate communication with a target cell using the target cell information;
• receive at least one of a handover message comprising a Radio Link Control (RLC) status report in a same transmitter time interval (TTI);
• and
• use the received information to approximate status reporting.