Mobile radio communication system which allocates spread codes mobiles which are able to determine the distance between a mobile and a base station
First Claim
1. A mobile radio communication system for performing radio communication between a base station and a plurality of mobile stations by using a spread spectrum method, wherein a common frequency is allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted with the common frequency has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, at least one of said base station and said mobile station comprising:
- means for detecting a distance between the mobile station and the base station; and
means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and the reverse link slots on the basis of the detection result of said distance detection means, and allocating the selected slots to radio communication between the base station and the mobile station.
5 Assignments
0 Petitions
Accused Products
Abstract
In a mobile radio communication system for performing radio communication between a base station and a plurality of mobile stations by a code division multiple access method, a plurality of slots (T1 to T4) for a forward link from a base station (BS) to a mobile station (MS) and a plurality of slots R1 to R4 for a reverse link from the mobile station (MS) to the base station (BS) are set on a first radio frequency f2 in a time-division multiplexing manner. The slots are set in accordance with the distance between the base station and the mobile station, and the transmission power of the base station in each slot is associated with this distance. The transmission power is low in the slot associated with a short distance between the base station and the mobile station, and the transmission power is high in the slot associated a long distance between the base station and the mobile station. The mobile station (MS) detects the received electric field intensity of a pilot/sync signal coming from the base station (BS) with a second radio frequency, and sends the detected information to the base station (BS). On the basis of the detected value of the received electric field intensity of the mobile station (MS) sent from the mobile station (MS), the base station (BS) determines the distance between the base station and the mobile station, selects the associated pair of slots from among the pairs of slots T1/R1 to T4/R4, thereby allocating the selected slots to this mobile station (MS).
56 Citations
44 Claims
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1. A mobile radio communication system for performing radio communication between a base station and a plurality of mobile stations by using a spread spectrum method, wherein a common frequency is allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted with the common frequency has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, at least one of said base station and said mobile station comprising:
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means for detecting a distance between the mobile station and the base station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and the reverse link slots on the basis of the detection result of said distance detection means, and allocating the selected slots to radio communication between the base station and the mobile station. - View Dependent Claims (2, 3, 4)
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5. A mobile radio communication system for performing radio communication between a base station and a plurality of mobile stations by using a spread spectrum method in which a spread code is allocated to each of the plurality of mobile stations, a speech signal is coded by the allocated spread code, and the coded speech signal communicates with the base station, wherein different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted by the forward link and the reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, at least one of said base station and said mobile station comprising:
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means for detecting a distance between the mobile station and the base station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and the reverse link slots on the basis of the detection result of said distance detection means, and allocating the selected slots to radio communication between the base station and the mobile station. - View Dependent Claims (6, 7, 8, 43)
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9. A radio communication system for performing radio communication between a base station and a plurality of mobile stations, said system comprising:
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time-division multiplexing means for dividing a speech channel between the base station and a mobile station into a plurality of slots and allocating a predetermined slot to the mobile station in accordance with information relating to a distance between the mobile station and the base station; and code division multiple access means for assigning different codes to a plurality of said mobile stations that have been allocated the predetermined slot. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A mobile station for use in a mobile radio communication system, wherein radio communication is performed between a base station and the mobile station by using a spread spectrum method, and a common frequency is allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted with the common frequency has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the mobile station comprising:
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means for acquiring information relating to a distance between the mobile station and the base station; and means for transmitting a signal including the acquired information to the base station. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A base station for use in a mobile radio communication system, wherein radio communication is performed between a mobile station and the base station by using a spread spectrum method, and a common frequency is allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted with the common frequency has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the base station comprising:
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means for storing the plurality of forward and reverse link slots, each slot being associated with information relating to a distance between the base station and the mobile station; means for receiving a signal from the mobile station, the signal including information relating to the distance between the base station and the mobile station; and means for selecting one of the stored forward link slots and one of the stored reverse link slots associated with the received information, and allocating the selected slots to radio communication between the base station and the mobile station. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A mobile station for use in a mobile radio communication system, wherein radio communication is performed between a base station and the mobile station by using a spread spectrum method, and different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted by the forward link and reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the mobile station comprising:
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means for acquiring information relating to a distance between the mobile station and the base station; and means for transmitting a signal including the acquired information to the base station.
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39. A base station for use in a mobile radio communication system, wherein radio communication is performed between a mobile station and the base station by using a spread spectrum method, and different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted by the forward link and reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the base station comprising:
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means for storing the plurality of forward and reverse link slots, each of said slots being associated with information relating to a distance between the base station and the mobile station; means for receiving a signal from the mobile station, the signal including information relating to the distance between the base station and the mobile station; and means for selecting one of the stored forward link slots and one of the stored reverse link slots associated with the received information, and allocating the selected slots to radio communication between the base station and the mobile station.
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40. A base station for use in a mobile radio communication system, wherein radio communication is performed between a mobile station and the base station by using a spread spectrum method, and a common frequency is allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted with the common frequency has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the base station comprising:
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means for receiving a signal from the mobile station, the signal including information relating to a distance between the base station and the mobile station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and reverse link slots based on the received information, and allocating the selected slots to radio communication between the base station and the mobile station.
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41. A base station for use in a mobile radio communication system, wherein radio communication is performed between a mobile station and the base station by using a spread spectrum method in which a spread code is allocated to each of the plurality of mobile stations, a speech signal is coded by the allocated spread code, and the coded speech signal communicates with the base station, and different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted by the forward link and reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the base station comprising:
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means for receiving a signal from the mobile station, the signal including information relating to a distance between the base station and the mobile station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and reverse link slots based on the received information, and allocating the selected slots to radio communication between the base station and the mobile station.
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42. A mobile radio communication system for performing radio communication between a base station and a plurality of mobile stations by using a spread spectrum method, wherein different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and a signal transmitted by the forward link and the reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, at least one of said base station and said mobile station comprising:
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means for transmitting at least sync information from the base station to the mobile station, said mobile station performing radio communication via said forward link and reverse link based on the sync information transmitted from the base station; means for detecting a distance between the mobile station and the base station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and the reverse link slots on the basis of the detection result of said distance detection means, and allocating the selected slots to radio communication between the base station and the mobile station.
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44. A base station for use in a mobile radio communication system, wherein radio communication is performed between a mobile station and the base station by using a spread spectrum method, and different frequencies are allocated to a forward link from the base station to the mobile station and to a reverse link from the mobile station to the base station, and the base station transmits at least sync information to the mobile station by using a sync radio frequency different from a radio frequency of the forward link and the reverse link, and a signal transmitted by the forward link and reverse link has a communication format in which a plurality of forward link slots and a plurality of reverse link slots are time-division multiplexed, the base station comprising:
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means for receiving a signal from the mobile station, the signal including information relating to a distance between the base station and the mobile station; and means for selecting a predetermined forward link slot and a predetermined reverse link slot from among the forward link slots and reverse link slots based on the received information, and allocating the selected slots to radio communication between the base station and the mobile station.
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Specification