Radio communication system, base station, relay station,mobile staion, and packet transmission control method
First Claim
1. A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in multihop packet transmission, and configured to perform communication based on a wireless packet transmission system, wherein a receiver station in the packet transmission comprises:
- interference level measuring means for measuring an interference level at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the desired signal level thus calculated; and
wherein the sender station comprises;
transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of the desired signal level notified of by the receiver station; and
determining means for determining whether the packet is transmissible to the receiver station, on the basis of the transmission power amount calculated by the transmission power amount calculating means.
1 Assignment
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Accused Products
Abstract
The object is to control interference in a permissible range by applying the CDMA system to signal collision in the conventional CSMA and TDMA base multihop systems and to relax the hidden terminal problem and others to enhance the throughput of the entire system by grouping of channel groups in multihop transmission and by control of transmission based on an interference level from another station. A multihop relay station calculates a desired signal level, for example, from an interference level at its own station of a packet sent from a mobile station, and notifies the mobile station of the desired signal level; and the mobile station calculates a transmission power amount of a packet from the desired signal level, determines whether the packet is transmissible to the station as a source of the desired signal level, on the basis of the transmission power amount, and transmits the packet by a power of the transmission power amount to the source station determined as a packet-transmissible station. On this occasion, an interference signal is weakened by assignment of channel groups 1, 2 for transmission of signals.
174 Citations
64 Claims
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1. A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in multihop packet transmission, and configured to perform communication based on a wireless packet transmission system,
wherein a receiver station in the packet transmission comprises: -
interference level measuring means for measuring an interference level at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the desired signal level thus calculated; and
wherein the sender station comprises;
transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of the desired signal level notified of by the receiver station; and
determining means for determining whether the packet is transmissible to the receiver station, on the basis of the transmission power amount calculated by the transmission power amount calculating means. - View Dependent Claims (2, 3)
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4. A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in multihop packet transmission, and configured to perform communication based on a wireless packet transmission system,
wherein a receiver station in the packet transmission comprises: -
interference level measuring means for measuring an interference level at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement;
determining means for determining whether a packet is transmissible from a sender station, on the basis of at least one of the interference level, the desired signal level, a reception level of a control signal, and a hop count from a transmission-originating station to its own station; and
notifying means for notifying the sender station of the desired signal level according to a result of the determination by the determining means. - View Dependent Claims (5, 6)
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7. A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in packet transmission, and applying CDMA to a radio multiplexing scheme of packet transmission,
wherein the base station or the relay station comprises: -
interference level measuring means for measuring an interference level at its own station of a channel group used in reception, at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying the mobile station of the desired signal level thus calculated; and
wherein the mobile station comprises;
transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of the desired signal level notified of by the base station or the relay station; and
determining means for determining whether the packet is transmissible to the station as a source of the desired signal level, on the basis of the transmission power amount calculated by the transmission power amount calculating means. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in packet transmission, and applying CDMA to a radio multiplexing scheme of packet transmission,
wherein each of the base station, the relay station, and the mobile station comprises: -
interference level measuring means for measuring an interference level at its own station of a channel group used in reception, at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement;
desired signal level notifying means for notifying a sender station of the packet, of the desired signal level thus calculated;
transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of a desired signal level notified of by another station, at the time of transmitting or relaying a packet; and
determining means for determining whether the packet is transmissible to the station as a source of the desired signal level, on the basis of the transmission power amount calculated by the transmission power amount calculating means. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A base station constituting a radio communication system for communication based on a wireless packet transmission system, with a mobile station and a relay station having a relaying function in packet transmission, the base station comprising:
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interference level measuring means for measuring an interference level at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the packet, of the desired signal level thus calculated. - View Dependent Claims (29, 31, 32, 33, 34)
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30. A base station constituting a radio communication system applying CDMA to a radio multiplexing scheme of packet transmission, with a mobile station and a relay station having a relaying function in packet transmission, the base station comprising:
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interference level measuring means for measuring an interference level at its own station of a channel group used in reception, at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the packet, of the desired signal level thus calculated.
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35. A mobile station constituting a radio communication system for communication based on a wireless packet transmission system, with a base station and a relay station having a relaying function in packet transmission, the mobile station comprising:
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transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of a desired signal level notified of by a sender station of the packet; and
determining means for determining whether the packet is transmissible from the sender station, on the basis of the transmission power amount calculated by the transmission power amount calculating means. - View Dependent Claims (36, 37, 39, 40)
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38. A mobile station constituting a radio communication system applying CDMA to a radio multiplexing scheme of packet transmission, with a base station and a relay station having a relaying function in packet transmission, the mobile station comprising:
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transmission power amount calculating means for calculating a transmission power amount of a packet on the basis of a desired signal level notified of by the base station or the relay station; and
determining means for determining whether the packet is transmissible to the station as a source of the desired signal level, on the basis of the transmission power amount calculated by the transmission power amount calculating means.
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41. A relay station constituting a radio communication system for communication based on a wireless packet transmission system, with a base station and a mobile station and having a relaying function in packet transmission, the relay station comprising:
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interference level measuring means for measuring an interference level at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the packet, of the desired signal level thus calculated. - View Dependent Claims (42, 43, 45, 46, 47, 48, 49, 50)
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44. A relay station constituting a radio communication system applying CDMA to a radio multiplexing scheme of packet transmission, with a base station and a mobile station and having a relaying function in packet transmission, the relay station comprising:
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interference level measuring means for measuring an interference level at its own station of a channel group used in reception, at the time of receiving a packet;
desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and
desired signal level notifying means for notifying a sender station of the packet, of the desired signal level thus calculated.
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51. A packet transmission control method in a radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in multihop packet transmission and configured to perform communication based on a wireless packet transmission system, the packet transmission control method comprising:
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an interference level measuring step wherein a receiver station in the packet transmission measures an interference level;
a desired signal level calculating step wherein the receiver station calculates a desired signal level on the basis of the interference level obtained in the measurement;
a desired signal level notifying step wherein the receiver station notifies a sender station of the desired signal level thus calculated;
a transmission power amount calculating step wherein the sender station calculates a transmission power amount of a packet on the basis of the desired signal level thus notified of;
a determining step wherein the sender station determines whether the packet is transmissible to the receiver station, on the basis of the transmission power amount thus calculated; and
a packet transmitting step wherein the sender station transmits the packet by a power according to the transmission power amount for the receiver station, to the receiver station determined as a packet-transmissible station. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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52. A packet transmission control method executed at the time of transmitting a packet from a mobile station via a relay station to a base station in a radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in packet transmission and applying CDMA to a radio multiplexing scheme of packet transmission, the packet transmission control method comprising:
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an interference level measuring step wherein a receiver station of a packet measures an interference level at its own station of the received packet;
a desired signal level calculating step wherein the receiver station calculates a desired signal level on the basis of the interference level obtained in the measurement;
a desired signal level notifying step wherein the receiver station notifies a sender station of the packet, of the desired signal level thus calculated;
a transmission power amount calculating step wherein the sender station calculates a transmission power amount of a packet on the basis of the desired signal level thus notified of;
a determining step wherein the sender station determines whether the packet is transmissible to the receiver station, on the basis of the transmission power amount thus calculated; and
a packet transmitting step wherein the sender station transmits the packet by a power according to the transmission power amount for the receiver station, to the receiver station determined as a packet-transmissible station.
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Specification