CDMA mobile communication scheme with effective use of sector configuration
First Claim
1. A method of mobile communication in a CDMA mobile communication system including base stations connected to a communication network and mobile stations for carrying out communications in a CDMA scheme with the base stations, each base station having a plurality of sectors dividing a cell of each base station, the method comprising the steps of:
- transmitting a perch channel spread by a single perch channel spread code assigned to each base station, from each one of at least two sectors of each base station, such that each mobile station determines its connection target base station according to perch channels received from different base stations;
receiving upward signals at more than one reception sectors of each base station from those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the transmitting step, despreading the upward signals received at said more than one reception sectors by using an identical uplink spread code, and carrying out a maximal ratio combining of despread upward signals at each base station, in a case of carrying out a simultaneous reception at said more than one reception sectors; and
spreading downward signals by using an identical downlink spread code at each base station, and transmitting spread downward signals from more than one transmission sectors of each base station to those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the transmitting step, in a case of carrying out a simultaneous transmission from said more than one transmission sectors.
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Accused Products
Abstract
A CDMA mobile communication scheme capable of increasing a number of sectors while not increasing a number of perch channel spread codes and not jamming the control channel traffic, so as to obtain the capacity increase effect by the use of the sector configuration effectively. At the base station, a perch channel spread by an identical perch channel spread code assigned to the base station is transmitted from each one of at least two sectors of the base station. Then, upward signals from each mobile station are received at more than one reception sectors, the upward signals received at more than one reception sectors are despread by using an identical uplink spread code, and a maximal ratio combining of despread upward signals is carried out, in a case of carrying out a simultaneous reception at more than one reception sectors. Also, downward signals are spread by using an identical downlink spread code, and spread downward signals are transmitted from more than one transmission sectors to each mobile station, in a case of carrying out a simultaneous transmission from more than one transmission sectors.
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Citations
30 Claims
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1. A method of mobile communication in a CDMA mobile communication system including base stations connected to a communication network and mobile stations for carrying out communications in a CDMA scheme with the base stations, each base station having a plurality of sectors dividing a cell of each base station, the method comprising the steps of:
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transmitting a perch channel spread by a single perch channel spread code assigned to each base station, from each one of at least two sectors of each base station, such that each mobile station determines its connection target base station according to perch channels received from different base stations; receiving upward signals at more than one reception sectors of each base station from those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the transmitting step, despreading the upward signals received at said more than one reception sectors by using an identical uplink spread code, and carrying out a maximal ratio combining of despread upward signals at each base station, in a case of carrying out a simultaneous reception at said more than one reception sectors; and spreading downward signals by using an identical downlink spread code at each base station, and transmitting spread downward signals from more than one transmission sectors of each base station to those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the transmitting step, in a case of carrying out a simultaneous transmission from said more than one transmission sectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A base station apparatus for use in a CDMA mobile communication system including base stations connected to a communication network and mobile stations for carrying out communications in a CDMA scheme with the base stations, each base station having a plurality of sectors dividing a cell of each base station, the base station apparatus of each base station comprising:
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a perch channel transmission device for transmitting a perch channel spread by a single perch channel spread code assigned to each base station, from each one of at least two sectors of each base station, such that each mobile station determines its connection target base station according to perch channels received from different base stations; a communication channel reception device for receiving upward signals at more than one reception sectors of each base station from those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the perch channel transmission device, despreading the upward signals received at said more than one reception sectors by using an identical uplink spread code, and carrying out a maximal ratio combining of despread upward signals at each base station, in a case of carrying out a simultaneous reception at said more than one reception sectors; and a communication channel transmission device for spreading downward signals by using an identical downlink spread code at each base station, and transmitting spread downward signals from more than one transmission sectors of each base station to those mobile stations which determined each base station as their connection target base station according to the perch channel transmitted by the perch channel transmission device, in a case of carrying out a simultaneous transmission from said more than one transmission sectors. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A mobile station apparatus for use in a CDMA mobile communication system including base stations connected to a communication network and mobile stations for carrying out communications in a CDMA scheme with the base stations, wherein each base station has a plurality of sectors dividing a cell of each base station and transmits a perch channel spread by a single perch channel spread code assigned to each base station, from each one of at least two sectors of each base station, and the perch channel transmitted from each sector contains a sector information for identifying each sector, the mobile station apparatus of each mobile station comprising:
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a perch channel reception device for receiving the perch channel transmitted from each sector of each base station, determining a connection target base station according to perch channels received from different base stations, and selecting one transmission sector for transmitting downward signals from the connection target base station to said mobile station apparatus according to the perch channel transmitted from each sector of the connection target base station; a communication channel reception device for receiving the downward signals transmitted from the connection target base station; and a communication channel transmission device for transmitting upward signals to the connection target base station, the upward signals containing a portion for notifying said one transmission sector to the connection target base station by using the sector information contained in the perch channel transmitted from each sector of the connection target base station, so that the connection target base station carries out a transmission from said one transmission sector notified from said mobile station apparatus.
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30. A mobile station apparatus for use in a CDMA mobile communication system including base stations connected to a communication network and mobile stations for carrying out communications in a CDMA scheme with the base stations, wherein each base station has a plurality of sectors dividing a cell of each base station, transmits a perch channel spread by a single perch channel spread code assigned to each base station, from each one of at least two sectors of each base station, and transmits downward signals from different sectors through communication channels at different timings with respect to a transmission timing of the perch channel, the mobile station apparatus of each mobile station comprising:
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a perch channel reception device for receiving the perch channel transmitted from each sector of each base station and determining a connection target base station according to perch channels received from different base stations; a communication channel reception device for receiving the downward signals transmitted from the connection target base station, identifying each sector from which the downward signals are currently received according to a difference between a receiving timing of the perch channel and a receiving timing of each communication channel, and measuring a receiving level of a communication channel for each identified sector; and a communication channel transmission device for transmitting upward signals to the connection target base station, the upward signals containing a portion for notifying each identified sector and a measured receiving level for each identified sector to the connection target base station, so that the connection target base station selects at least one transmission sector for transmitting the downward signals from the connection target base station to said mobile station apparatus according to the measured receiving level for each identified sector notified from said mobile station apparatus.
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Specification