Digital cellular network/system with mobile stations communicating with base stations using frequency-hopping and having enhanced effect of interference diversity

• US 5,570,352 A
• Filed: 02/17/1995
• Issued: 10/29/1996
• Est. Priority Date: 05/06/1992
• Status: Expired due to Term

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Poyhonen, Petri
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US08/331,518
• Time in Patent Office: 620 Days
• Field of Search: 370/50, 370/95.1, 370/18, 370/19, 375/200, 375/202, 375/205, 375/206, 379/58, 379/59, 379/60, 379/61, 455/33.1, 455/33.2, 455/33.4
• US Class Current: 370/330
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning

Abstract

A digital TDMA/FDMA (Time Division Multiple Access/Frequency division Multiple Access) cellular network system, suitable for a microcellular network and to maximize the advantage to be gained from interference diversity, including base stations forming radio cells, each having a determined static frequency of a channel of the cell and including a first transceiver continuously transmitting control data of the system concerning the cell at the control channel frequency, at least in one predetermined time slot of a TDMA frame. The TDMA frame of the first transceiver includes traffic channels at least in a part of the other time slots. Each base station further includes at least one second transceiver for the traffic channels. The system further includes mobile stations connected to the base stations via a radio path. The traffic channels of the second transceiver units use frequency-hopping, at least in a part of the radio cells, in such a way that, on those traffic channels aligned with the predetermined time slots of the control data of the cell in the first transceiver, substantially all frequencies of the available frequency band, except the control data transmission frequency determined for the cell, belong to the hopping sequence. On those traffic channels which are in the other time slots, substantially all frequencies of the available frequency band belong to the hopping sequence.

Claims

1. A digital TDMA/FDMA (Time Division Multiple Access/Frequency Division Multiple Access) cellular network system, comprising:

a plurality of base stations forming respective radio cells;

each said base station having a determined static frequency of a control channel of the respective said radio cell, and comprising a first transceiver transmitting control data of said system concerning the respective said radio cell continuously at said determined static frequency, in at least one predetermined time slot of a TDMA frame having a plurality of time slots and including a plurality of traffic channels in at least a part of others of said time slots;

at least some of said base stations each further comprising at least one second transceiver for said traffic channels;

a plurality of mobile stations, each effectively connected to a respective said base station via radio; and

said system providing a reuse pattern of N radio cells, wherein N is a number corresponding to the total number of carrier frequencies used by all said base stations, each said carrier frequency forming a respective said control channel in a respective one of said radio cells of said reuse pattern, and, in respective radio cells of said reuse pattern, respective said traffic channels of the respective said at least one second transceiver using frequency-hopping sequence such that;

on respective traffic channels within time slots corresponding to each said at least one time slot as is being used for transmitting respective control data of the respective radio cell, substantially all of said carrier frequencies except for the respective said carrier frequency on which control data is being transmitted for the respective said radio cell, belong to said frequency-hopping sequence, and

on respective traffic channels within said other time slots, substantially all of said carrier frequencies belong to the frequency-hopping sequence, and

respective said frequency-hopping sequences for said radio cells of said reuse pattern being mutually non-synchronous.

2. The cellular network system of claim 1, wherein:

said reuse pattern is provided in each said cell of said system.

3. The cellular network system of claim 1, wherein:

each said first transceiver is arranged to transmit at a respective said determined static frequency in all of said at least one and at least other time slots.

4. A digital TDMA/FDMA (Time Division Multiple Access/Frequency Division Multiple Access) cellular network system, comprising:

a plurality of base stations forming respective radio cells;

each said base station having a determined static frequency of a control channel of the respective said radio cell, and comprising a first transceiver transmitting control data of said system concerning the respective said radio cell continuously at said determined static frequency, in at least one predetermined time slot of a TDMA frame having a plurality of time slots and including a plurality of traffic channels in at least a part of others of said time slots;

at least some of said base stations each further comprising at least one second transceiver for said traffic channels;

a plurality of mobile stations, each effectively connected to a respective said base station via radio; and

said system providing a reuse pattern of N radio cells, wherein N is a number corresponding to the total number of carrier frequencies used by all said base stations, each said carrier frequency forming a respective said control channel in a respective one of said radio cells of said reuse pattern, and, in respective radio cells of said reuse pattern, respective said traffic channels of the respective said at least one second transceiver using frequency-hopping sequence such that;

substantially all of said carrier frequencies, except for the respective said carrier frequency on which control data is transmitted for the respective said radio cell, belong to said frequency-hopping sequence involving all said traffic channels, and

respective the frequency-hopping sequences for said radio cells of said reuse pattern being mutually non-synchronous.

5. The cellular network system of claim 4, wherein:

said reuse pattern is provided in each said cell of said system.

6. The cellular network system of claim 4, wherein:

each said first transceiver is arranged to transmit at a respective said determined static frequency in all of said at least one and at least other time slots.

7. The cellular network system of claim 4, further including:

for each said base station having said second transceiver and participating in a respective said reuse pattern, a connector effectively connecting the respective said first transceiver and each respective said second transceiver, in a predetermined sequence, for providing each respective said frequency-hopping sequence.

8. A digital TDMA/FDMA (Time Division Multiple Access/Frequency Division Multiple Access) cellular network system, comprising:

a plurality of base stations forming respective radio cells;

each said base station having a determined static frequency of a control channel of the respective said radio cell, and comprising a first transceiver transmitting control data of said system concerning the respective said radio cell continuously at said determined static frequency, in at least one predetermined time slot of a TDMA frame having a plurality of time slots and including a plurality of traffic channels in at least a part of others of said time slots;

at least some of said base stations each further comprising at least one second transceiver for said traffic channels;

said predetermined time slot of a TDMA frame being common to all of said radio cells, and all of said radio cells being mutually synchronized such that the TDMA frames of all of said radio cells are transmitted synchronously and with a same mutual timing;

a plurality of mobile stations, each effectively connected to a respective said base station via radio; and

for at least some of said radio cells, the respective base stations each including means providing respective said traffic channels of the respective said at least one second transceiver with frequency-hopping sequence, such that;

on respective traffic channels within time slots corresponding to each same respective said at least one time slot as is being used for transmitting respective control data of the respective radio cell, substantially all of said carrier frequencies, except for the respective said carrier frequency on which control data is being transmitted for the respective said radio cell, belong to said frequency-hopping sequence, and

on respective traffic channels within said other time slots, substantially all of said carrier frequencies belong to said frequency-hopping sequence, and

each time slot which is simultaneous with said at least one predetermined time slot is blocked from being used for transmitting traffic by at least one said second transceiver of at least one said base station, for reducing interference exposure of control channels of other said radio cells of said system.

9. The cellular network system of claim 8, wherein:

said at least some of said radio cells includes all of said radio cells.