Extended range TDMA system
First Claim
1. A cellular radio communication arrangement including a cellular base station having two or more continuous or overlapping coverage areas and a corresponding TDMA transceiver associated with each coverage area, including at least:
- an inner transceiver including a first receiver adapted to receive first incoming signals from an inner coverage area, and a first transmitter adapted to transmit first outgoing signals at least to the inner coverage area; and
an outer transceiver having a second receiver adapted to receive second incoming signals from an outer coverage area, and a second transmitter adapted to transmit second outgoing signals at least to the outer coverage area;
and an additional third receiver adapted to receive third upcoming signals from the inner coverage area;
wherein the first and third receivers operate according to respective first and third receiver time frames which are synchronized;
wherein the second receiver operates according to a second time frame which is delayed with respect to the first and third time frames by a predetermined delay period;
wherein the first receiver receives the first incoming signals at a first uplink frequency associated with a first downlink frequency transmitted by the first transmitter;
wherein the second and third receivers receive, respectively, the second and the third incoming signals at a second uplink frequency associated with a second downlink frequency transmitted by the second transmitter; and
wherein idle mobile telephones in each of the coverage areas are caused to camp on the second downlink frequency whereby access requests from the idle mobile telephones are transmitted on the second uplink frequency, and are received in an appropriate time slot by the second or third receiver depending on the location of the mobile telephone transmitting the access request.
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Accused Products
Abstract
A TDMA radio communication system such as GSM has a limited time period (td) over which the transmission from a mobile station (MS1 . . . MS5) can be advanced to allow for the transit time of the signal between the mobile and the base station (BS), and this limits the maximum range of the system to radius R1. By co-locating a first transceiver (TX1/RX1) operating on a first frequency band (F1) and a second transceiver (TX2/RX2) operating on a second frequency band (F0), and delaying the reception time slots of RX2 by td, the first transceiver can be used for communication up to radius R1, and the second transceiver can be used for communication for mobiles between radius R1 and radius R0. Idle mobiles are instructed to camp on F0 and RX1 is switched during access request periods to look for access requests on F0.
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Citations
14 Claims
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1. A cellular radio communication arrangement including a cellular base station having two or more continuous or overlapping coverage areas and a corresponding TDMA transceiver associated with each coverage area, including at least:
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an inner transceiver including a first receiver adapted to receive first incoming signals from an inner coverage area, and a first transmitter adapted to transmit first outgoing signals at least to the inner coverage area; and an outer transceiver having a second receiver adapted to receive second incoming signals from an outer coverage area, and a second transmitter adapted to transmit second outgoing signals at least to the outer coverage area; and an additional third receiver adapted to receive third upcoming signals from the inner coverage area; wherein the first and third receivers operate according to respective first and third receiver time frames which are synchronized; wherein the second receiver operates according to a second time frame which is delayed with respect to the first and third time frames by a predetermined delay period; wherein the first receiver receives the first incoming signals at a first uplink frequency associated with a first downlink frequency transmitted by the first transmitter; wherein the second and third receivers receive, respectively, the second and the third incoming signals at a second uplink frequency associated with a second downlink frequency transmitted by the second transmitter; and wherein idle mobile telephones in each of the coverage areas are caused to camp on the second downlink frequency whereby access requests from the idle mobile telephones are transmitted on the second uplink frequency, and are received in an appropriate time slot by the second or third receiver depending on the location of the mobile telephone transmitting the access request. - View Dependent Claims (2, 3, 4)
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5. A method of increasing the range of a TDMA cellular radio base station in a network arrangement in which the timing of transmissions from mobile telephones can be adjusted over a predetermined range, the base station having a cellular radio communication arrangement including a cellular base station having two or more contiguous or overlapping coverage areas, and a corresponding TDMA transceiver associated with each coverage area, said method including the steps of:
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providing an inner transceiver including (1) a first receiver adapted to receive first incoming signals from an inner coverage area, and (2) a first transmitter adapted to transmit first outgoing signals at least to the inner coverage area; providing an outer transceiver having (1) a second receiver adapted to receive second incoming signals from an outer coverage area, and (2) a second transmitter adapted to transmit second outgoing signals at least to the outer coverage area; providing an additional third receiver adapted to receive third incoming signals from the inner coverage area; operating the first and third receivers according to respective first and third receiver time frames which are synchronized; operating the second receiver according to a second time frame which is delayed with respect to the first and third time frames by a predetermined delay period; receiving, at the first receiver, the first incoming signals at a first uplink frequency associated with a first downlink frequency transmitted by the first transmitter; receiving, at the second and third receivers, respectively, the second and the third incoming signals at a second uplink frequency associated with a second downlink frequency transmitted by the second transmitter; causing idle mobile telephones in each of the coverage areas to camp on the second downlink frequency; transmitting access requests from the idle mobile telephones, on the second uplink frequency; and receiving, in an appropriate time slot, the access requests received by the second or third receiver, depending on the location of the mobile telephone transmitting the access request. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification