EP0600713A2
Expired / Lapsed
EP
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Communication method and system
Assignee: Nokia Oyj
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Filing: 1993-11-30
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Granted: —
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Expires: 2013-11-30
Abstract
Abstract The invention is a communication method with the equipment belonging to it and its aim is to increase the number of users in a network or cell. Data is transmitted by the method by using a combined CDMA/TDMA or TDMA/CDMA multiple use whereby complementary code sets (complete orthogonal codes or non-interacting codes) are used as spreading codes. In the applications of the method to existing or planned TDMA systems, a CDMA part is added to them, by which a spreading coded CDMA multiple access is used in every time slot of the TDMA frame, in said way, to increase the number of users. The described method does not require any power control methods, nor any multiple access interference cancelling methods to increase network or cell capacity.
Inventors
- 👤 Pentti Leppanen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:15
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04J; H04J13/00; H04J13/0007; H04J13/004; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/7103; H04B7/24; H04B7/26; H04B7/2618; H04J13/0003; H04J13/0011; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/7097; H04B2201/709709; H04J13/16; H04J13/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
41 words
A communication method especially for cellular mobile communication, characterized in that a combined CDMA/TDMA or TDMA/CDMA multiple access is used and that in the CDMA part complementary code sets or complete orthogonal codes between the users are used as spreading codes.
Claim 2
Dependent Claim
70 words
A method according to claim 1, characterized in that in each case a transmission burst is transmitted, comprising a certain number of data bits or data symbols, to be spreading modulated by one code member (S n 1), after which a transmission pause follows, next burst is transmitted, modulated by another spreading code (S n 2), orthogonal in relation to the preceding one, after which another transmission pause follows, a.s.o.
Claim 3
Dependent Claim
62 words
A method according to claim 2, characterized in the fact that the length of the transmission pause is T M + T R + T ▲ , where T M is the so-called multipath delay spread, T R is the signal propagation delay difference within the network or cell, and T ▲ is the inaccuracy of the time synchronisation of the users.
Claim 4
Dependent Claim
59 words
A method according the claim 3, characterized in that the total time (T MUX ) belonging to the spreading modulation of the transmission burst by all of the code set, including the transmission pauses, is used to change the spreading code members in the base station receiver and, respectively, to change the matched filter in the mobile station receiver.
Claim 5
Dependent Claim
34 words
A communication system, particularly for cellular mobile communications, characterized in that the transmission side comprises, connected to each other, the TDMA/CDMA or CDMA/TDMA blocks, and the receiving side, respectively, the CDMA/TDMA or TDMA/CDMA blocks.
Claim 6
Dependent Claim
25 words
A communication system, characterized in the fact that it has been carried out by constructing an additional CDMA accessory to the existing TDMA communication system.
Claim 7
Independent Claim
38 words
A method for radio telephone communication comprising, assigning respective groups of radio telephone users to respective ones of a plurality of orthogonal radio telephone communication channels, and assigning to each user of said groups mutually orthogonal spreading codes.
Claim 8
Dependent Claim
19 words
A method for radio telephone communication according to claim 7, wherein the orthogonal spreading codes comprise complementary code sets.
Claim 9
Dependent Claim
22 words
A method for radio telephone communication according to claim 7 or 8 wherein the orthogonal communication channels comprise time division multiplexed channels.
Claim 10
Dependent Claim
22 words
A method for radio telephone communication according to claim 7 or 8, wherein the orthogonal communication channels comprise frequency division multiplexed channels.
Claim 11
Dependent Claim
30 words
A method for radio telephone communication according to claim 7 or 8, wherein the orthogonal communication channels comprise quadrature components of a carrier wave, different polarisation levels or rotation directions.
Claim 12
Independent Claim
42 words
A system for radio telephone communication, comprising means for assigning respective groups of radio telephone users to respective ones of a plurality of orthogonal radio telephone communication channels, and means for assigning to each user of said groups mutually orthogonal spreading codes.
References Cited (Backward Citations)
No citation records indexed.
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