Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-06-12
2009-06-02
Appiah, Charles N (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S452200, C370S331000
Reexamination Certificate
active
07542765
ABSTRACT:
Disclosed is a handoff method connected with resource allocation in order to prevent QoS degradation, which may occur during or before/after a handoff on account of channel state change resulting from the mobility of a radio communication apparatus. To this end, a serving base station currently-connected to the radio communication apparatus and a target base station to be connected after a handoff periodically or non-periodically measure uplink/downlink channel states in relation to the radio communication apparatus, and the target base station allocates resources (e.g., time slot, specific subcarrier, or specific frequency band) most suitable for the service requested from the radio communication apparatus during a handoff, thereby preventing QoS degradation due to the handoff. In addition, in the case of a radio communication apparatus using multiple antennas, the serving base station notifies the target base station of a multi-antenna operation mode in relation to the radio communication apparatus before finishing a handoff procedure, thereby minimizing QoS degradation due to the handoff.
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Stavos Tzavidas et al., Clarifications on the Handover Procedure, IEEE 802.16 Broadband Wireless Access Working Group, Jun. 8, 2005.
Cheon Jung-Hoon
Cho Sung-Hyun
Kwun Jong-Hyung
Lee Ok-Seon
Park Chi-Hyun
Appiah Charles N
Doan Kiet
Samsung Electronics Co,. Ltd
The Farrell Law Firm PC
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