WIRELESS BASE STATION AND HANDOVER METHOD THEREOF
First Claim
1. A handover method for a wireless base station, the wireless base station being configured for wireless communicating with a user equipment (UE) and exchanging message with a target base station, the handover method including:
- sending, by the wireless base station, a first reconfiguration message to the UE, wherein the first reconfiguration message includes a Packet Data Convergence Protocol (PDCP) reconfiguration message for changing a PDCP Sequence Number (SN) length of the UE to a predetermined bit length;
after sending the first reconfiguration message, sending, by the wireless base station, a handover request message or a handover required message to inform the target base station, and receiving a handover request acknowledge message or a handover command message by the wireless base station; and
after receiving the handover request acknowledge message or the handover command message by the wireless base station, sending, by the wireless base station, a second reconfiguration message to the UE, wherein the second reconfiguration message includes a handover message.
1 Assignment
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Accused Products
Abstract
A wireless base station is wireless communicating with a user equipment (UE) and exchanging information with a target base station. A handover method for the a wireless base station includes: sending by the wireless base station to a UE a first reconfiguration message which includes a PDCP reconfiguration message to change a PDCP SN length of the UE to a predetermined bit length; after sending the first reconfiguration message, sending by the wireless base station a handover request message or a handover required message to inform the target base station and receiving a handover request acknowledge message or a handover command message; and after receiving the handover request acknowledge message or the handover command message, sending by the wireless base station a second reconfiguration message to the UE, wherein the second reconfiguration message includes a handover message.
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Citations
24 Claims
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1. A handover method for a wireless base station, the wireless base station being configured for wireless communicating with a user equipment (UE) and exchanging message with a target base station, the handover method including:
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sending, by the wireless base station, a first reconfiguration message to the UE, wherein the first reconfiguration message includes a Packet Data Convergence Protocol (PDCP) reconfiguration message for changing a PDCP Sequence Number (SN) length of the UE to a predetermined bit length; after sending the first reconfiguration message, sending, by the wireless base station, a handover request message or a handover required message to inform the target base station, and receiving a handover request acknowledge message or a handover command message by the wireless base station; and after receiving the handover request acknowledge message or the handover command message by the wireless base station, sending, by the wireless base station, a second reconfiguration message to the UE, wherein the second reconfiguration message includes a handover message. - View Dependent Claims (2, 3, 4, 5)
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6. A handover method for a wireless base station, the wireless base station being configured for wireless communicating with a user equipment (UE) and exchanging message with a target base station, the handover method including:
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sending, by the wireless base station, a handover request message or a handover required message to inform the target base station that the UE does not used an extended Sequence Number (SN) length in a PDCP layer and to inform the target base station that the UE has a candidate DRB ID; receiving a handover request acknowledge message or a handover command message by the wireless base station, and based on the handover request acknowledge message or the handover command message, determining by the wireless base station whether a DRB resource of the UE is released or not and whether a configuration of the UE is reset or not; and when the wireless base station determines that the DRB resource of the UE is not released and that the configuration of the UE is not reset, sending by the wireless base station a first reconfiguration message to the UE for changing a PDCP SN length of the UE to a predetermined bit length and for changing a DRB ID of the UE as the candidate DRB ID, wherein the first reconfiguration message includes a PDCP reconfiguration message and a handover message. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A wireless base station exchanging message with a target base station, the wireless base station including:
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at least one antenna for wireless communication with a user equipment (UE) and the target base station; and a controller coupled to the at least one antenna, the controller being configured for; controlling the at least one antenna to send a first reconfiguration message to the UE, wherein the first reconfiguration message includes a Packet Data Convergence Protocol (PDCP) reconfiguration message for changing a PDCP Sequence Number (SN) length of the UE to a predetermined bit length; after controlling the at least one antenna to send the first reconfiguration message, controlling the at least one antenna to send a handover request message or a handover required message to inform the target base station, and to receive a handover request acknowledge message or a handover command message; and after controlling the at least one antenna to receive the handover request acknowledge message or the handover command message, controlling the at least one antenna to send a second reconfiguration message to the UE, wherein the second reconfiguration message includes a handover message. - View Dependent Claims (14, 15, 16, 17)
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18. A wireless base station being configured for exchanging message with a target base station, the wireless base station including:
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at least one antenna for wireless communicating with a user equipment (UE) and the target base station; and a controller coupled to the at least one antenna, the controller being configured for; controlling the at least one antenna to send a handover request message or a handover required message to inform the target base station that the UE does not used an extended Sequence Number (SN) length in a PDCP layer and to inform the target base station that the UE has a candidate DRB ID; controlling the at least one antenna to receive a handover request acknowledge message or a handover command message, and based on the handover request acknowledge message or the handover command message, determining whether a DRB resource of the UE is released or not and whether a configuration of the UE is reset or not; and when the controller determines that the DRB resource of the UE is not released and that the configuration of the UE is not reset, controlling the at least one antenna to send a first reconfiguration message to the UE for changing a PDCP SN length of the UE to a predetermined bit length and for changing a DRB ID of the UE as the candidate DRB ID, wherein the first reconfiguration message includes a PDCP reconfiguration message and a handover message. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification