System for soft handover in MIMO OFDMA mobile communication system and method thereof
First Claim
1. A system for performing a soft handover in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system, the system comprising:
- a mobile station;
a serving base station for transmitting signals to the mobile station using a predetermined coding scheme and a predetermined frequency region allocation scheme when it is detected that the mobile station must perform the soft handover; and
a plurality of neighbor base stations for transmitting signals to the mobile station using the predetermined coding scheme and the predetermined frequency region allocation scheme when it is detected that the mobile station must perform the soft handover.
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Accused Products
Abstract
Disclosed is a method for performing a soft handover in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system including a mobile station (MS), a serving base station (BS) and a plurality of neighbor BSs, each neighbor BS being different from the serving BS the serving BS providing a service to the MS. According to the method, the MS requests a soft handover to the serving BS when the serving BS detects that the MS must be handed over to one of the neighbor BSs, the serving BS notifies the neighbor BSs of the soft handover of the MS in response to the request for the soft handover, transmits signals to the MS using a predetermined coding scheme and a predetermined frequency region allocation scheme, and the neighbor BSs transmit signals to the MS using the predetermined coding scheme and the predetermined frequency region allocation scheme.
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Citations
30 Claims
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1. A system for performing a soft handover in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system, the system comprising:
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a mobile station;
a serving base station for transmitting signals to the mobile station using a predetermined coding scheme and a predetermined frequency region allocation scheme when it is detected that the mobile station must perform the soft handover; and
a plurality of neighbor base stations for transmitting signals to the mobile station using the predetermined coding scheme and the predetermined frequency region allocation scheme when it is detected that the mobile station must perform the soft handover. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for performing a soft handover by a serving base station providing service to a mobile station in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system including a plurality of neighbor base stations, each of the plurality of neighbor base stations being different from the serving base station, the method comprising the steps of:
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detecting that the mobile station must perform the soft handover; and
transmitting signals to the mobile station by means of a predetermined coding scheme and a predetermined frequency region allocation scheme. - View Dependent Claims (8, 9, 10, 11)
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12. A method for performing a soft handover by each of a plurality of neighbor base stations in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system including a mobile station, a serving base station, and the plurality of neighbor base stations, each of the plurality of neighbor base stations being different from the serving base station, the serving base station providing service to the mobile station, the method comprising the steps of:
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detecting that the mobile station must perform the soft handover; and
transmitting signals to the mobile station by means of a predetermined coding scheme and a predetermined frequency region allocation scheme. - View Dependent Claims (13, 14, 15, 16)
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17. A method for soft handover by a mobile station in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system including a serving base station and a plurality of neighbor base stations, each of the plurality of neighbor base stations being different from the serving base station, the serving base station providing service to the mobile station, the method comprising the steps of:
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requesting a soft handover to the serving base station when the serving base station detects that the mobile station must be handed over to one of the plurality of neighbor base stations; and
receiving and combining signals from the serving base station and the plurality of neighbor base stations after requesting the soft handover to the serving base station, and decoding the combined signals according to a coding scheme and a frequency region allocation scheme applied to the serving base station and the plurality of neighbor base stations. - View Dependent Claims (18, 19, 20, 21)
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22. A method for soft handover in a Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system including a mobile station, a serving base station and a plurality of neighbor base stations, each of the plurality of neighbor base stations being different from the serving base station, the serving base station providing service to the mobile station, the method comprising the steps of:
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requesting a soft handover by the mobile station to the serving base station when the serving base station detects that the mobile station must be handed over to one of the neighbor base stations;
notifying, by the serving base station, the plurality of neighbor base stations of the soft handover of the mobile station in response to the request for the soft handover;
transmitting signals by the serving base station to the mobile station by means of a predetermined coding scheme and a predetermined frequency region allocation scheme; and
transmitting signals by the plurality of neighbor base stations to the mobile station using the predetermined coding scheme and the predetermined frequency region allocation scheme. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification