Methods and system for performing handover in a wireless communication system
First Claim
1. A wireless transmit/receive unit (WTRU) for performing handover in a wireless communication system, the WTRU comprising:
- a transceiver configured to receive a handover command from a first evolved Node-B (eNode-B); and
a controller configured to;
facilitate a handover from the first eNode-B to a second eNode-B in accordance with the handover command,perform timing adjustment with the second eNode-B using a random access channel (RACH) access procedure, andreset radio link control (RLC) and hybrid automatic repeat request (HARQ) after receiving the handover command.
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Abstract
A method and system for performing handover in a third generation (3G) long term evolution (LTE) system are disclosed. A source evolved Node-B (eNode-B) makes a handover decision based on measurements and sends a handover request to a target eNode-B. The target eNode-B sends a handover response to the source eNode-B indicating that a handover should commence. The source eNode-B then sends a handover command to a wireless transmit/receive unit (WTRU). The handover command includes at least one of reconfiguration information, information regarding timing adjustment, relative timing difference between the source eNode-B and the target eNode-B, information regarding an initial scheduling procedure at the target eNode-B, and measurement information for the target eNode-B. The WTRU then accesses the target eNode-B and exchanges layer 1/2 signaling to perform downlink synchronization, timing adjustment, and uplink and downlink resource assignment based on information included in the handover command.
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Citations
32 Claims
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1. A wireless transmit/receive unit (WTRU) for performing handover in a wireless communication system, the WTRU comprising:
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a transceiver configured to receive a handover command from a first evolved Node-B (eNode-B); and a controller configured to; facilitate a handover from the first eNode-B to a second eNode-B in accordance with the handover command, perform timing adjustment with the second eNode-B using a random access channel (RACH) access procedure, and reset radio link control (RLC) and hybrid automatic repeat request (HARQ) after receiving the handover command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for performing handover from a first evolved Node-B (eNode-B) to a second eNode-B in a wireless communication system, the method comprising:
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a wireless transmit/receive unit (WTRU) receiving a handover command from the first eNode-B; the WTRU performing timing adjustment with the second eNode-B using a random access channel (RACH) access procedure; and the WTRU resetting radio link control (RLC) and hybrid automatic repeat request (HARQ) after receiving the handover command. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification