TDMA-CDMA mobile communication system

Claim 2

A mobile unit communication system as claimed in claim 1, wherein said second area is larger than said first area and first area is provided within said second area.

Claim 3

A mobile unit communication system as claimed in claim 1, wherein said first and second base stations transmit said first and second communication signals to have the same frequency band and said each of mobile units further comprises an antenna for receiving and transmitting said first and second communication signals and a switch responsive to a mode signal indicative of said first and second modes for supplying said first communication signal between said antenna and said first communication circuit in said first mode and for supplying said second communication signal between said antenna and said second communication circuit in said second mode.

Claim 4

A mobile unit communication system as claimed in claim 1, wherein said each of mobile units further comprises: a modulation circuit for modulating said first and second communication signals; an antenna for receiving said first and second communication signal; a demodulation circuit for demodulating said first and second communication signals; and a switch responsive to a receiving/transmitting signal indicative of receiving and transmitting modes for supplying said first communication signal from said modulation circuit to said antenna in said transmitting mode and supplying said first and second communication signals from said antenna to said demodulation circuit.

Claim 5

A mobile unit communication system as claimed in claim 1, wherein said first and second communication signals have first and second frames respectively, said first and second frames having the same amount of data and each of said mobile units further comprising a baseband data processing portion for processing data to be transmitted and for supplying said processed data to said first communication circuit in said first mode and to said second communication circuit in said second mode.

Claim 6

A mobile unit communication system as claimed in claim 1, wherein each of said mobile units further comprises a framing circuit for framing data to be transmitted and for supplying said framed data to said first communication circuit in said first mode and to said second communication circuit in said second mode.

Claim 7

A mobile unit communication system comprising: mobile units; a first base station, having a first service area, for transmitting and receiving first and second CDMA signals to/from mobile units within said first service area respectively, said first CDMA signal having a first frame which includes a plurality of first channels in a time division multiple access and time division duplex manner; and a second base station, having a second service area, for transmitting and receiving first and second TDMA signals to and from mobile units within said second service area respectively, said first TDMA signal having a second frame which includes a plurality of second channels in a code division multiple access and time division duplex manner, said first frame has the same length as said second frame, at least one of said first and second base stations further having a frame synchronizing circuit for detecting a phase between said first and second frames and synchronizing said first and second frames each other in accordance with said detected phase, each of said mobile units having: a baseband circuit for framing data to be transmitted on the basis of a frame signal and for digital-modulation said data framed to produce first and second baseband signals in first and second modes respectively; a up-converting circuit for frequency-up-converting said first baseband signal in said first mode and said second baseband signal in said second mode, a transmission power control circuit for controlling of a power of an output signal from the up-converting portion; an antenna portion for, in a transmission mode, transmitting an output of said transmission control circuit as said second TDMA signal in said first mode and as said second CDMA signal in said second mode and for, in a receiving mode, receiving said first TDMA signal in said first mode and first CDMA signal in said second mode, said transmission and receiving modes being effected in a time division duplex manner; a demodulation circuit for demodulating said first TDMA and first CDMA signals from said antenna in said first and second modes respectively; and a frame detection portion for detecting said first and second frames included in said first TDMA and fist CDMA signals in said first and second modes respectively to produce said frame signal.

Claim 8

A mobile unit communication system as claimed in claim 7, wherein said baseband circuit having first and second framing circuits for framing said data to be transmitted to have said first and second frame in said first and second modes respectively, a first digital modulation circuit for digital-modulating an output of said first framing circuit, a second digital modulation circuit for digital-modulating an output of said second framing circuit, and a code division multiplexing circuit for code-division-multiplexing to an output of said second digital modulation circuit, anda switch for supplying an output of said first digital modulation circuit as said first baseband signal in said first mode and an output of said code division multiplexing circuit as said second baseband signal in second mode.

Claim 9

A mobile unit communication system comprising: mobile units; a first base station, having a first service area, for transmitting and receiving first and second CDMA signals to and from mobile units within said first service area respectively, said first CDMA signal having a first frame which includes a plurality of first channels in a time division multiple access and time division duplex manner; and a second base station, having a second service area, for transmitting and receiving first and second TDMA signals to and from mobile units within said second service area respectively, said first TDMA signal having a second frame which includes a plurality of second channels in a code division multiple access and time division duplex manner, said first frame has the same length as said second frame, at least one of said first and second base stations further having a frame synchronizing circuit for detecting a phase between said first and second frames and synchronizing said first and second frames each other in accordance with said detected phase, each of said mobile units having: a baseband circuit, having a framing circuit for framing data to be transmitted on the basis of a frame signal and a digital modulation circuit for digital-modulation said data framed, a TDMA signal producing circuit for producing a TDMA transmission signal to have one of said plurality of first channels, and a CDMA generation circuit for generating a CDMA transmission signal through spectrum spreading with a code defining one of said second channels, and a switch for outputting said TDMA transmission signal in a first mode and supplying said CDMA transmission signal in a second mode; an up-converting circuit for frequency-up-converting said TDMA transmission signal from said switch in said first mode and said CDMA transmission signal from said switch in said second mode; a transmission power control portion for controlling of a power of an output signal from the up-converting circuit; an antenna portion for, in a transmission mode, transmitting an output of said transmission control circuit as said second TDMA signal in said first mode and as said second CDMA signal in said second mode and for, in a receiving mode, receiving said first TDMA signal in said first mode and first CDMA signal in said second mode, said transmission and receiving modes being effected in a time division duplex manner; a demodulation circuit for demodulating said first TDMA and first CDMA signals from said antenna in said first and second modes respectively; and a frame detection portion for detecting said first and second frames included in said first TDMA and first CDMA signals in said first and second modes respectively to produce said frame signal.

Claim 10

A mobile unit communication system as claimed in claim 7, wherein demodulation comprises a down-converting circuit for down-converting and detecting said transmitted signal to produce a third baseband signal, a TDMA demodulating circuit for demodulating said third baseband signal, and an inverse spectrum spreading circuit for inverse-spectrum spreading said baseband signal, and a switch for outputting an output of said TDMA demodulating circuit in said first mode and an output of said inverse spectrum spreading circuit in said first mode.

Claim 11

A mobile unit communication system as claimed in claim 7, wherein said baseband circuit having first and second framing circuits for framing said data to be transmitted to have said first and second frame respectively, a first digital modulation circuit for digital-modulating an output of said first framing circuit, a second digital modulation circuit for digital-modulating said second framing circuit, and a code division multiplexing circuit for code-division-multiplexing to an output of said second digital modulation circuit.

Claim 12

A mobile unit communication system as claimed in claim 6, wherein said framing circuit adds a frame synchronizing signal and control data to said data and supplies said framed data.

Claim 13

A mobile unit communication system as claimed in claim 6, further comprising a digital modulation circuit for digital-modulating said framed data and supplying said framed data to said first communication in said first mode and said second communication circuit in said second mode.

Claim 14

A mobile unit communication system as claimed in claim 1, further comprising a mode detection circuit for generating a mode signal indicative of said first and second modes in accordance with outputs of said first and second communication circuits.

Claim 15

A mobile unit communication system as claimed in claim 4, further comprising a frame detection circuit for detecting said first frame from said first communication signal from said antenna in said first mode and detecting said second frame from said second communication signal from said antenna in said second mode to produce a frame signal and a control circuit for producing said receiving/transmitting signal in response to said frame signal.