EP0701337A2
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EP
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Mobile communication system using various multiple access methods
Assignee: Mitsubishi Electric Corp
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Filing: 1995-09-08
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Granted: —
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Expires: 2015-09-08
Abstract
Abstract A mobile communication system in which various access methods may be selected according to the user's priority. In the mobile communication system, each of a mobile station and radio base stations has a radio processor, which has TDMA, CDMA and FDMA communication units. The CDMA communication unit comprises channel coders each for performing a primary modulation to a transmitting signal, spread-spectrum code generators for respectively generating different spread-spectrum signals, a clock generator/controller for controlling the generation of chip clocks to control the generation of the spread-spectrum codes, oscillators for setting different carrier frequencies to outputs calculated as products, and a CPU for generally controlling various parts or elements to control the assignment of a CDMA signal or a TDMA signal to an arbitrary time slot transmitted from the TDMA communication unit. The radio processor transmits different signals of different access methods existing in each time slot of the same frame different signals.
Inventors
- 👤 Yoshinori c/o Mitsubishi Denki K.K. Uchida
- 👤 Kenichi c/o Mitsubishi Denki K.K. Ishida
- 👤 Takashi c/o Mitsubishi Denki K.K. Kashiwagi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 18:52
CPC Classifications
H; H04; H04W; H04W4/00; H04W4/24; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18532; H04J; H04J13/00; H04J13/10; H04M; H04M2215/00; H04M2215/32; H04W36/00; H04W36/14; H04W36/142; H04W72/00; H04W72/50; H04W72/56; H04W88/00; H04W88/02; H04W88/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
110 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprises: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on a TDMA method; and (b) CDMA communication means having at least one spread-spectrum code generator and adapted for communication of CDMA signals based on a CDMA method; (c) said CDMA communication means being adapted for assigning spread-spectrum codes, which are generated by said spread-spectrum code generator, to said time slot.
Claim 2
Dependent Claim
117 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprising: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on a TDMA method; and (b) CDMA communication means having a spread-spectrum code generator, which generates a number of spread-spectrum codes, and adapted for communication of CDMA signals based on a CDMA method; (c) said CDMA communication means being adapted for assigning different spread-spectrum signals, which are generated by said spread-spectrum code generators, respectively to said time slots.
Claim 3
Dependent Claim
115 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprising: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, based on a TDMA method; and (b) CDMA communication means having a number of spread-spectrum code generators, which generate different spread-spectrum codes, and adapted for communication of CDMA signals based on a CDMA method; (c) said CDMA communication means being adapted for assigning said different spread-spectrum signals, which are generated by said spread-spectrum code generators, respectively to said time slots.
Claim 4
Dependent Claim
150 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprises: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on a TDMA method; (b) CDMA communication means having at least one spread-spectrum code generator and adapted for communication of CDMA signals based on a CDMA method; and (c) control means for controlling each said station to selectively assign said TDMA signal or said CDMA signal to each of said time slots; (d) said CDMA communication means being adapted for assigning spread-spectrum signals, which are generated by said spread-spectrum code generator, to said time slots in such a manner that both said TDMA and CDMA signals exist in said time slots.
Claim 5
Dependent Claim
158 words
A mobile communication system which includes a mobile station and a radio base station for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprises: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on a TDMA method; (b) CDMA communication means having a spread-spectrum code generator, which generates a number of spread-spectrum codes, and adapted for communication of CDMA signals based on a CDMA method; and (c) control means for controlling each said station to selectively assign said TDMA signal or said CDMA signal to each of said time slots; (d) said CDMA communication means being adapted for assigning different spread-spectrum code, which are generated by said spread-spectrum code generator, respectively to said time slot in such a manner that both said TDMA and CDMA signals exist in said time slots.
Claim 6
Dependent Claim
158 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations comprises: (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on a TDMA method; (b) CDMA communication means having a number of spread-spectrum code generators, which generate different spread-spectrum codes, and adapted for communication of CDMA signals based on a CDMA method; and (c) control means for controlling each said station to selectively assign said TDMA signal or said CDMA signal to each of said time slots; (d) said CDMA communication means being adapted for assigning said different spread-spectrum codes, which are generated by said spread-spectrum code generators, respectively to said time slots in such a manner that both said TDMA and CDMA signals exist in said time slots.
Claim 7
Dependent Claim
32 words
A mobile communication system according to claim 4, wherein said control means controls both said communication means in such a manner that both said TDMA and CDMA signals exist in one frame.
Claim 8
Dependent Claim
24 words
A mobile communication system according to claim 4, wherein said control means controls the generation of said spread-spectrum codes by said spread-spectrum code generator.
Claim 9
Dependent Claim
47 words
A mobile communication system according to claim 4, wherein said control means decides an access method to be used for communication with another station based on an access method deciding condition and assigns signal, which are according to the decided access method, to a predetermined time slot.
Claim 10
Dependent Claim
36 words
A mobile communication system according to claim 9, further including an exchange for controlling communications between said mobile station and said radio base stations, said exchange having storage means for storing said access method deciding condition.
Claim 11
Dependent Claim
88 words
A mobile communication system according to claim 4, wherein said CDMA communication means at each said radio base station has channel coders located in association with the respective time slots for performing a primary modulation to transmitted information, and said spread-spectrum code generator for generating different spread-spectrum codes one for each of said time slots, and wherein said control means assigns the CDMA signals generated based on product information of an output of each said channel coder associated with the respective time slot and the corresponding spread-spectrum code.
Claim 12
Dependent Claim
95 words
A mobile communication system according to claim 4, wherein said CDMA communication means has a number of channel coders in association with each of said time slots for performing a primary modulation to transmitted information, and said spread-spectrum code generator for generating different spread-spectrum codes one for each of said time slots, and wherein said control means assigns the CDMA signals generated based on product information of an output of each said channel coder and each said spread-spectrum code to said time slots to assign a number of channels to one of said time slots.
Claim 13
Dependent Claim
28 words
A mobile communication system according to claim 12, wherein said control means sets a number of said channels of the same access method for the same time slot.
Claim 14
Dependent Claim
69 words
A mobile communication system according to claim 4, wherein said mobile station has receiving-state detecting means for detecting a state of receiving signals from a number of said radio base stations, and said control means sets, based on the detected state of receiving, a separate channel between said mobile station and another radio base station using a time slot different from the time slot presently occupied by said channel.
Claim 15
Dependent Claim
20 words
A mobile communication system according to claim 1, wherein said CDMA communication means has means for generating empty time slot.
Claim 16
Dependent Claim
36 words
A mobile communication system according to claim 1, wherein said CDMA communication means has a initial value setting unit for arbitrarily setting an initial value of the spread-spectrum code generated by each said spread-spectrum code generator.
Claim 17
Dependent Claim
79 words
A mobile communication system which includes a mobile station and radio base stations for performing wireless communication between said stations using a predetermined method selected from a number of multiple access methods, wherein each of said stations is loaded with a spread-spectrum code generator for generating a number of spread-spectrum codes and has a noncoherent delay lock loop for detecting the spread-spectrum code assigned to the CDMA signal contained in each time slot received based on the TDMA method.
Claim 18
Dependent Claim
41 words
A mobile communication system according to claim 17, wherein said CDMA communication means has a spread-spectrum code value setting unit for arbitrarily setting a value of the spread-spectrum code, which is generated by said spread-spectrum code generator, by a generating polynomial
Claim 19
Dependent Claim
30 words
A mobile communication system according to claim 18, wherein said spread-spectrum code value setting unit has a group of switches for freely changing a feedback loop including a shift register.
Claim 20
Dependent Claim
41 words
A mobile communication system according to claim 1, wherein said CDMA communication means has a spread-spectrum code value setting unit for arbitrarily setting a value of the spread-spectrum code, which is generated by said spread-spectrum code generator, by a generating polynomial.
Claim 21
Dependent Claim
30 words
A mobile communication system according to claim 20, wherein said spread-spectrum code value setting unit has a group of switches for freely changing a feedback loop including a shift register.
Claim 22
Dependent Claim
29 words
A mobile communication system according to claim 4, wherein said CDMA communication means has a chip clock control unit for controlling a chip clock of said spread-spectrum code generator.
Claim 23
Dependent Claim
29 words
A mobile communication system according to claim 4, wherein said CDMA communication means has a chip rate control unit for controlling a chip rate of said spread-spectrum code generator.
Claim 24
Dependent Claim
27 words
A mobile communication system according to claim 4, wherein each said station has a carrier frequency control unit for controlling a carrier frequency of each time slot.
References Cited (Backward Citations)
No citation records indexed.
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