Multiplex communications – Duplex – Communication over free space
Patent
1997-04-01
2000-03-14
Olms, Douglas W.
Multiplex communications
Duplex
Communication over free space
370282, 370285, 370315, 370527, 455 7, 455426, H04J 300
Patent
active
06038221&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is intended to be used at telecommunication systems, for instance radio based access networks in which powerful and simply constructed network components, preferably repeaters, are included.
2. Discussion of the Background
The present invention shows how signalling can be superimposed on existent DECT Digital European Cordless Telecommunications-signalling. The invention can also be used on other systems with similar access method as DECT.
DECT uses TDMA/TDDD/MC, i.e. Time Division Multiple Access/Time Division Duplex/MultiCarrier, which is schematically shown in FIG. 1, which illustrates the division and use in time and frequency in DECT. Along the x-axis is shown a frame consisting of 12+12 time slots for down and uplink respectively, and along the y-axis is shown the 10 carrier channels, i.e. the division in frequency. In DECT these slots may be utilized very freely; because DECT is intended to be selfplanning etc there are no real obstructions for using all the slots in a frame for, for instance a down link.
TDD in classification in up and down link on the "same" carrier and MC in the using of more than one carrier. The TDMA-structure can be said to be in the division in time slots for up and down link.
The technical problem consists of the fact that there for some services are needs for sending short messages within a DECT-system without needing to allocate a special time slot for this and without the need to allocate more frequency space.
With a DECT-system is in this connection referred to Fixed Parts (FP; an FP can consist of a CFP, Central Fixed Part and one or more remote fixed part RFP. RFP and or FP can be described as "base stations" in DECT), Repeaters (sometimes called FR; Fixed Repeaters) and Portable Parts (PP). With short messages is referred to a short string of characters intended for for instance identification (of base stations repeaters or other radio based network elements) etc, or special messages of for instance broadcast type. Some of the equipment which can receive or transmit these messages shall be simple, and is not intended to contain any digital signal processing of the contents in separate time slots (typical examples of this are repeaters).
SUMMARY OF THE INVENTION
By the invention can be built up arrangements with powerful and simple network components, which shall be able to signal without digital decoding. For instance radio based access networks with repeaters using TDMA/TDD/MC are appropriate for implementation of the invention. The amount of information which can be transferred with the invention is very large, which implies that even a more general communication will be possible. By the invention is signalling between network components without mentioned digital decoding or adding separate capacity made possible. The new procedure of sigalling is not previously known. Repeaters can be arranged in a functional and simple way, which gives the mentioned system a very big economic and functional potential. The invention can be used for present systems using mentioned TDMA/TDD/MC. By the invention are solved important problems related to system signalling to respective from repeaters in TDMA/TDD/MC-system without the communication being negatively influenced.
BRIEF DESRIPTION OF THE DRAWINGS
One at present suggested embodiment of a device which presents the significant features of the invention is described in the following at the same time referring to the enclosed drawings, where;
FIG. 1 schematically shows the time and frequency division in DECT,
FIG. 2 shows a graphic description of the superimposed signalling,
FIG. 3 shows superimposed signalling with using whole and half time slots, and
FIG. 4 shows superimposed signalling with using two transceivers simultaneously.
DISCUSSION OF THE PREFERRED EMBODIMENT
The pattern representing the TDMA/TDD/MC-signalling can as such be used for superimposed signalling. In the case of DEC this allows for a simple case 10.sup.12 different possibil
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Olanders Peter
Wickman Johan
Hom Shick
Olms Douglas W.
Telia AB
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