Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1998-12-29
2000-12-12
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455502, 455343, H04B 138
Patent
active
061610232
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotating lobe access method. The main ideas of the invention are in the field of access, paging and call set-up procedures for conventional FDMA and TDMA mobile radio systems such as mobile telephone and PMR (Private Mobile Radio) systems. Another application of the invention is location systems.
The invention simplifies making fast and simple initial acquisition, paging, or call set up, both in downlink and uplink in mobile radio systems. The invention can be used in FDMA and TDMA systems and their hybrids working either in FDD (Frequency Division Duplex) or TDD (Time Division Duplex).
The invention is related to the following patent applications with the same filing date as the present application or to be filed in the near future, having the same owner as the present application and entitled:
STATE OF THE ART
Omnidirectional or 120.degree. sector antennas for access and communication are most common today in mobile communication systems. Problem areas are difficulties achieving high sensitivity and/or range. One solution today is using very high power in the base station (BS). However, this may create increased interference levels and low power consumption is generally desired.
The present invention, on the other hand, proposes using a narrow rotating lobe and achieving reply from the mobile station in the same, or somewhat delayed receiving lobe, resulting in the following advantages:
The suggested method increases sensitivity and/or range and capacity using the narrow lobe system.
The method is power efficient, avoiding high output power from the base station.
The mobile station gives fixed delay+variable delay.
Maximum paging sensitivity is obtained by high antenna gain.
Selective paging, i.e. paging in preferred directions sectors or ranges, enhances capacity, e.g. first transmission in last reported direction. This saves unnecessary emission.
Power control avoids hard capacity limits and will therefore introduce soft degradation.
Standard hardware, as used for conventional methods, can be used.
The actual page time depends on data rate, number of data bits to be transferred.
Paging channels support nominal 600 b/s, but optionally (1/16, 1/8, 1/4, 1/2, 2, 4, 8).times.600 b/s.
The lower data rate, the higher sensitivity is obtained (in principle 3-dB is gained for each reduction of the data rate by a factor 2).
The paging channel is treated similarly to an adaptive air interface, see our above-mentioned patent application.
The invention provides increased sensitivity and less mobile station power and complexity.
No delay equaliser is needed for the paging channel, due to low data rates and narrow lobes.
SUMMARY OF THE INVENTION
Thus, the present invention provides a rotating lobe access method in a telecommunication system including at least one base station and a number of mobile stations and having antenna means supporting a number of horizontal lobes for communication between the base station and the mobile stations.
In accordance with the invention signals to and from the antenna means are modulated by a lobe shaping unit to bring the lobe to rotate, or appear to rotate, in a horizontal plane. Also, rotations or sweeps in different vertical angles are possible. separate transmission and reception lobes and the reception lobe is a delayed replica of the transmission lobe. synchronisation with the base station transmission lobe, goes into a sleep mode. position of a mobile station by determining the azimuth angle and the distance by timing the time delay of the mobile station reply.
Also, the mobile station is capable of calculating its position using triangulation by listening to at least two base stations for obtaining the azimuth angles and distances to the respective base stations.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail below with reference to the accompanying drawings in which
FIG. 1 is a schematic view of a rotating lobe as utilised in the present invention, and
FIG. 2 is state diagram of
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patent: 5488737 (1996-01-01), Harbin et al.
patent: 5566355 (1996-10-01), Kanai
patent: 5590396 (1996-12-01), Henry
patent: 5966670 (1999-10-01), Keskitalo et al.
patent: 5978369 (1999-11-01), Silvestre et al.
patent: 5991635 (1999-11-01), Dent et al.
Johnson Torbjorn
Magnusson Bo G.
Eisenzopf Reinhard J.
Nguyen Duc
Radio Design Innovation TJ AB
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