WO1999043170A1 - Improved centrally located equipment for wireless telephone system - Google Patents
Improved centrally located equipment for wireless telephone system Download PDFInfo
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- WO1999043170A1 WO1999043170A1 PCT/US1999/003610 US9903610W WO9943170A1 WO 1999043170 A1 WO1999043170 A1 WO 1999043170A1 US 9903610 W US9903610 W US 9903610W WO 9943170 A1 WO9943170 A1 WO 9943170A1
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- Prior art keywords
- carrier signal
- signal
- frequency
- telephony
- circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Definitions
- the present invention relates to wireless communications systems, and more particularly to improved centrally located equipment for a wireless telephone system that incorporates an existing broadband distribution network, such as cable television network cable, to carry communication signals between wireless telephones and the centrally located equipment.
- an existing broadband distribution network such as cable television network cable
- the prior art teaches the use of an existing broadband distribution network to carry telephony signals between an existing telephone network and remote transceivers sites in defined cells or sectors.
- the remote transceivers sometimes called Remote Antenna Drivers (RADs)
- RADs Remote Antenna Drivers
- Such broadband distribution networks include, but are not limited to, fiber-optic cable, coaxial cable, and radio links.
- This centrally located equipment typically includes multiple Base Transceiver Stations (BTS) and multiple Remote Antenna Signal Processors (RASPs). Each BTS is connected to the telephone network and to the RASPs. Each RASP is connected to the broadband network.
- BTS Base Transceiver Stations
- RASP Remote Antenna Signal Processors
- Each BTS is connected to the telephone network and to the RASPs.
- Each RASP is connected to the broadband network.
- an audio telephony signal from the existing telephone network, and directed to a wireless telephone is input to a BTS where it is encoded for use in one of the known wireless telephone systems, which include GSM, CDMA and CT2.
- the encoded telephony signal is used to modulate a radio frequency carrier signal of an intermediate frequency (IF) before being processed further.
- IF intermediate frequency
- the IF signal Before being transmitted to a RASP the IF signal is frequency translated to a higher radio frequency (RF) carrier signal for transmission to a RASP.
- RF radio frequency
- the encoded signal and control signals are frequency translated to another RF carrier frequency used for transmission over the broadband distribution network to the Remote Antenna Drivers (RADs) in the cells or sectors.
- RADs Remote Antenna Drivers
- Such transmission over the broadband network is typically over fiber-optic cable or over coaxial cable.
- encoded telephony and control signals received by the RASPs over the broadband distribution network from the Remote Antenna Drivers (RADs) are first converted to an IF carrier signal.
- the IF carrier signal is initially signal processed in the RASP to remove the control signals, and the IF carrier signal is then translated to an RF signal for transmission to a BTS.
- the RF carrier signal carrying the telephony signal is first converted to an IF carrier signal before the telephony signal is extracted and converted into an analog or digital signal, depending on the type of system, and the encoded telephony signal is then sent to the telephone network.
- RASP Remote Antenna Signal Processor
- BTS Base Transceiver Station
- the above described need in the wireless telephony art is satisfied by the present invention.
- the improvement comprises simplifying the Base Transceiver Stations (BTS) and the Remote Antenna Signal Processors (RASPs).
- BTS Base Transceiver Stations
- RASP Remote Antenna Signal Processors
- This simplification lowers the cost of the BTS and RASP equipment, and decreases their complexity, which improves their reliability.
- This simplification consists of reducing the number of frequency translation steps utilized in the BTS and RASP equipment. More particularly, for telephony signals originating at the telephone network and terminating at a wireless telephone, the IF carrier signal in each BTS is not translated to an RF carrier signal before being transmitted to a RASP. In addition, the IF carrier signal in each RASP is not translated to an RF carrier signal before being transmitted to a BTS.
- the frequency of the IF carrier signal in the RASPs and BTSs is the same, and the IF carrier signals are transmitted between the BTSs and the RASPs. This result is a significant savings in the complexity and cost of the RASPs and BTSs.
- each prior art BTS and RASP has a number of telephony signal channels, each of which has the above described RF / IF translations, there is a large reduction in the number of frequency translation stages in this equipment. All IF to RF, and all RF to IF frequency translation stages at the RASP to BTS interface are eliminated.
- Figure 1 is a block diagram of a typical wireless telephony system integrated with an exemplary broadband distribution network.
- FIG 2 is a block diagram of the reverse direction portion of a prior art Remote Antenna Signal Processor (RASP) used with a wireless telephony system to transmit telephony signals toward Base Transceiver Stations (BTSs);
- RASP Remote Antenna Signal Processor
- FIG 3 is a block diagram of the forward direction portion of a prior art Remote Antenna Signal Processor (RASP) used with a wireless telephony system to transmit telephony signals toward Remote Antenna Drivers (RADs);
- RASP Remote Antenna Signal Processor
- FIG. 4 is a block diagram of the reverse direction portion of a Remote Antenna Signal Processor (RASP) incorporating the teaching of the present invention
- FIG. 5 is a block diagram of the forward direction portion of a Remote Antenna Signal Processor (RASP) incorporating the teaching of the present invention
- FIG 6 is a block diagram of a prior art Base Transceiver Station (BTS) used with a wireless telephony system to carry telephony signals between RASPs and BTSs; and
- Figure 7 is a block diagram of a Base Transceiver Station (BTS) incorporating the teaching of the present invention.
- BTS Base Transceiver Station
- circuit elements are assigned three digit reference numbers.
- the first digit of each reference number indicates in which Figure of the drawing an element is shown.
- the second and third digits of each reference number indicate specific circuit elements. If the same circuit element appears in more than one Figure of the drawing, the second and third digits of the reference number for that circuit element remain the same and only the first digit of the reference number changes to indicate the Figure of the drawing in which the circuit element is located.
- signal detector 225 in Figure 2 is the same signal detector labeled 425 in Figure 4.
- the term “reverse direction " refers to any signals traveling from Broadband Distribution Network 114 toward Telephone System 115, and the term “forward direction " refers to any signals traveling from Telephone System 115 toward Broadband Network 114 and finally a wireless telephone.
- FIG. 1 In the cable television industry the "forward direction” is referred to as “downstream”, and the “reverse direction” is referred to as “upstream”. This is mentioned because the wireless telephone system described herein can be utilized with a cable television distribution network.
- the term "telephony signals” includes voice, data, facsimile and any other type of signals that are sent over a telephone network now or the future.
- Drawing Figures 2 through 5 show prior art and new versions of Remote Antenna Signal Processor (RASP) 117 shown in Figure 1 ; and drawing Figures 6 and 7 show prior art and new versions of Base Transceiver Station (BTS) 116 shown in Figure 1. Throughout this Detailed Description, when Figures 2 through 7 are being described, reference is often made to RASP 117 and BTS 116 to remind the reader what circuits these Figures are part of, although the reference numbers 116 or 117 do not actually appear on those Figures.
- RASP Remote Antenna Signal Processor
- BTS Base Transceiver Station
- Figures 2 and 3 respectively show the reverse direction and forward direction portions of a prior art Remote Antenna Signal Processor (RASP) 117
- Figures 4 and 5 respectively show the reverse direction and forward direction portions of a Remote Antenna Signal Processor (RASP) 117 which utilizes the teaching of the present invention
- Figure 6 shows the reverse direction and forward direction portions of a prior art Base Transceiver Station (BTS) 116
- Figure 7 shows the reverse direction and forward direction portions of a Base Transceiver Station 116 which utilizes the teaching of the present invention.
- Figures 2 through 7 function in the following manner.
- telephony and control signals received from a wireless telephone 119 and a Remote Antenna Driver 118 via Broadband Distribution Network 114 are input to the prior art reverse direction RASP 117 circuitry shown in Figure 2.
- the telephony signals are transmitted from prior art RASP 117 in Figure 2 to the prior art reverse direction BTS 116 circuitry shown in the upper part of Figure 6.
- the analog or digital telephony signals are sent to Telephone System 115.
- telephony signals are sent from Telephone System 115 to BTS 116 in Figure 6 to encode the telephony signals before they are transmitted from prior art BTS 116 in Figure 6 to the prior art forward direction circuitry of RASP 117 shown in Figure 3.
- RASP 117 the prior art forward direction circuitry of RASP 117 shown in Figure 3.
- the combined telephony and control signals are transmitted from the prior art RASP in Figure 3, via Broadband Distribution Network 114 to a Remote Antenna Driver 118, and finally to a wireless telephone 119.
- telephony and control signals received from a wireless telephone 119 and a Remote Antenna Driver 118 via Broadband Distribution Network 114 are input to the reverse direction RASP 117 circuitry shown in Figure 4.
- the telephony signals are transmitted from RASP 117 in Figure 4 to reverse direction BTS 116 circuitry shown in the upper part of Figure 7.
- the telephony signals are sent to Telephone System 115.
- Telephone System 115 to the forward direction BTS circuitry in the lower portion of Figure 7 for initial signal encoding before they are transmitted from BTS 116 to the prior art forward direction circuitry of RASP 117 shown in Figure 5.
- RASP 117 After adding control signals, to transmit telephony signals toward telephony and control signals are transmitted from RASP 117 in Figure 5 to a Remote Antenna Driver 118 and wireless telephone 119 via Broadband Distribution Network 114.
- FIG. 1 is shown a simplified block diagram of an exemplary broadband distribution network 114 integrated with elements of a wireless telephone system.
- the wireless telephone system includes a plurality of remote transceivers known as Remote Antenna Drivers (RADs) 118 a-f.
- RADs Remote Antenna Drivers
- the broadband distribution network 114 may utilize coaxial cable, fiber optic cable, microwave links, or combinations of these.
- HFC hybrid fiber coaxial
- Integrated with broadband distribution network 114 is a wireless telephony system in which the present invention is utilized.
- One such wireless telephony system is taught in U.S. Patent application 08/695,175, filed Aug 1, 1996, and entitled "Apparatus And Method For Distributing Wireless Communications Signals To Remote Cellular Antennas".
- Another such wireless telephony system is taught in U.S. Patent 5,381,459.
- the telephony system disclosed herein includes Base Transceiver Stations (BTS) 116 a&b which are connected to a Telephone System 115.
- Base Transceiver Stations 116 a&b are also connected to Remote Antenna Signal Processors (RASPs) 117 a-d which are the interface to Broadband Distribution Network 114.
- Telephony signals and control signals to be sent between Telephone System 115 and Broadband Distribution Network 114 pass through and are processed by RASPs 117 a-d and RADs 118 a-f.
- one or more frequency bands or channels of the Broadband Distribution Network 114 are reserved to carry telephony signals and control signals between Telephone System 115 and wireless telephones 119.
- Telephony signals originating from Telephone System 115 pass through BTSsl 16 a&b and RASPs a-d and are transmitted along with control signals in frequency division multiplexing format, over Broadband Distribution Network 114 to ones of the plurality of RADs 118 a-f, which are also connected to Broadband Distribution Network 114, and thence to wireless telephones 119.
- Telephony signals originating at wireless telephones 119 are frequency multiplexed together by RADs
- each of BTSs 116 a&b there are a plurality of transceiver modules (not shown), as is known in the wireless telephony art, each of which operates at a single frequency, and which can handle a predetermined maximum number of telephony calls from wireless telephones.
- the frequency at which the RADs 118 a-f are assigned to operate must correspond to the operating frequency of an assigned BTS 116 a or b transceiver module. If a particular RAD 118 is re-assigned to function with a different transceiver module within BTS 116 a or b, circuit settings within the particular RAD 118 must also be changed to function with the different transceiver module.
- transceiver modules in a BTS 116 are also referred to as channel card modules and radio modules.
- RADs 118 In Figure 1 are shown three rows of RADs 118. Typically, a number of RADs 118 a-f are spaced along, and connected to, Broadband Distribution Network 114 to provide overlapping signal transmission and reception coverage for the entire wireless telephone system. Some of the RADs 118 a-f are physically located near the boundary between two or more cells or sectors and, depending on the frequency of operation they are set to, can be used to handle wireless telephony traffic in one or more of the sectors or cells. In Figure l,RADs 118 e&f in the bottom row are physically located along Broadband Distribution Network 114 and are configured to handle wireless telephony traffic in a first sector. RADs 118 c&d in the middle row in Figure 1 are configured and located to handle wireless telephone traffic in a second, adjacent sector. Finally, RADs 118 a&b are configured and located to handle wireless telephone traffic in a third, adjacent sector.
- Each of RADs 118 a-f has antennas 120, 121, 122 which are used to transmit to, and receive signals from, remote wireless telephones 119.
- Antenna 120 is used to transmit telephony signals to wireless telephones 119, while antennas 121 and 122 are used to receive telephony signals from wireless telephones 119.
- Antenna 121 is called the primary antenna, and antenna 122 is called the diversity antenna.
- Antennas 121 and 122 are physically spaced and cooperate to minimize signal fading and thereby provide continuous signal reception from wireless telephones 119.
- Figure 2 is shown a block diagram of the reverse direction portion of a prior art
- RASP Remote Antenna Signal Processor
- the reverse direction circuitry processes telephony and control signals received from wireless telephones and RADs 118, and received via a Broadband Distribution Network 114, and forwards them to prior art Base Transceiver Station 116 shown in Figure 6.
- Base Transceiver Station 116 shown in Figure 6.
- RASP circuit Within the prior art RASP circuit are three parallel channel circuits 21 la, 21 lb and
- Telephony signals from a wireless telephone 119, and control signals from a RAD 118 that is carrying the telephony signals, are carried over Broadband Distribution Network 112 to bandpass filter 223 at the input of alpha channel 211a. These telephony and control signals are divided for further processing as described further in this detailed description.
- Filter 223 removes out of band signals that are present on Broadband Distribution Network 114 before the telephony and control signals are input to signal divider 224.
- Divider 224 divides and applies the combined telephony and control signals to both divider 226 and to signal detector 225.
- Signal detector 225 separates the control signals from the telephony signal and forwards them to a microprocessor for processing.
- the microprocessor analyzes the control signals and causes circuit adjustments to be made in RASPs 117 and RADs 118.
- Divider 224 also applies the telephony signal to divider 226 which again divides the signal, which includes the combined signals from primary receive antenna 121 and diversity receive antenna 122, and applies them to mixers 227a and 227b.
- the telephony signal received by the primary receive antenna 121 and diversity receive antenna 122 from a single RAD 118 are frequency multiplexed together.
- Mixers 227a and 227b are used to separate these two frequency multiplexed telephony signals.
- Mixer 227a has a second input from oscillator OSCl
- mixer 227b has a second input from oscillator OSC2.
- the frequency of oscillators OSCl and OSC2 is different and the mixing process of mixers 227a and 227b causes the modulated carrier signal output from each of them to have the same intermediate frequency (IF) carrier signal.
- the frequency of oscillators OSCl and OSC2 are controlled by the microprocessor and are set according to the assigned frequency of operation for the alpha channel on Broadband Distribution Network 114.
- the heterodyning process of mixers 227a and 227b produce a number of unwanted signals which are removed respectively by bandpass filters 229a and 229b, and which respectively pass only the desired telephony signal from the primary antenna and the diversity antenna of a RAD 118. Only the primary receive antenna telephony signal is output from filter 229a and is input to mixer 230a where it is mixed with a signal from oscillator OSC3.
- the heterodyning process of mixer 230a is used to translate the intermediate frequency carrier signal, modulated with the primary receive antenna telephony signal, to a radio frequency (RF) carrier signal that is transmitted via path alpha 1 to prior art Base Transceiver Station 116 in Figure 6.
- the heterodyning process of mixer 230a also produces a number of unwanted signals that are removed by bandpass filter 231a.
- the heterodyning process of mixer 230b is used to translate the IF carrier signal, modulated with the secondary receive antenna telephony signal, to an RF carrier signal that is transmitted via path alpha 2 to prior art Base Transceiver Station 116 in Figure 6.
- the heterodyning process of mixer 230b also produces a number of unwanted signals that are removed by bandpass filter 231b.
- the alpha, beta and gamma channels 211a, 211b and 211c operate in the same manner except for their frequency of operation. To simplify the description of RASP 117 circuitry only the alpha channel circuitry 211a is described in detail above, and is not repeated for beta channel 211b and gamma channel 211c.
- FIG 3 is shown a block diagram of the forward direction portion of a prior art Remote Antenna Signal Processor (RASP) 117.
- the forward direction circuitry processes telephony signals received from a Base Transceiver Station 116 to add control signals, and transmits them via Broadband Distribution Network 114 to and RADs 118 to wireless telephones 119 in Figure 1.
- RASP 117 are three parallel forward direction circuits which also are referred to as alpha, beta and gamma channels 334a, 334b and 334c. They all operate in the same manner except for their frequency of operation, so only the operation of the alpha channel 334a is described in detail.
- Telephony signals modulating an RF carrier signal are received from prior art BTS 116 ( Figure 6) in the alpha channel are input to bandpass filter 332 to remove all out of band signals.
- the filtered RF signals are then input to mixer 333 along with a signal from oscillator OSC5 for frequency translation to an IF carrier frequency.
- the heterodyning process of mixer 333 also produces a number of unwanted signals which are removed by bandpass filter 335. This IF carrier signal is later translated back to an RF carrier signal
- the filtered IF carrier signal, modulated by the telephony signal, is input to a second mixer 336 along with an input from oscillator OSC6.
- the frequency of oscillator OSC6, and corresponding oscillators in the beta and gamma channels 334b and 334c are set by a microprocessor. The result is that the IF carrier signal in the alpha, beta and gamma channels is different.
- the IF carrier signal output from mixer 336 is input to combiner 338 along with the IF carrier signals from beta channel 334b and gamma channel 334c.
- Combiner 338 combines the three IF carrier signals, each at a different frequency, into a single frequency multiplexed signal which is input to bandpass filter 339 where all unwanted frequencies from the heterodyning process of mixer 336, and the similar mixers in the beta and gamma channels, are removed. Only the three frequency multiplexed IF carrier signals, modulated respectively by the alpha, beta and gamma channel telephony signals, are passed through filter 339 to mixer 340.
- Mixer 340 is used to translate the frequency of the IF carrier signals output from filter 339, now carrying telephony signals from the alpha 334a, beta 334b and gamma 334c channels, to an RF carrier signal for transmission over Broadband Distribution Network 114 to a RAD 118.
- the output of mixer 340 includes many unwanted signals which are removed by bandpass filter 343.
- the desired RF carrier signal is amplified by amplifier 344 before being input to diplexer 345 along with a second input that is now described.
- This reference signal is used to control reference oscillator 346 to transmit a reference oscillator signal to all RADs 118 to accurately set the frequency of operation of their internal oscillators (not shown).
- Diplexer 445 is used to combine the RF carrier signal described above with the reference oscillator 346 signal for transmission over Broadband Distribution Network 114 to RADs 118.
- RASP Remote Antenna Signal Processor
- FIG 4 is shown a circuit block diagram of the reverse direction portion of a Remote Antenna Signal Processor (RASP) 117 incorporating the teaching of the present invention.
- RASP Remote Antenna Signal Processor
- FIG. 4 When comparing the new reverse direction RASP 117 circuitry shown in Figure 4 with the prior art reverse direction RASP 117 circuitry shown in Figure 2, it can be seen that the two circuits are similar but the new reverse direction circuitry shown in Figure 4 is much simpler.
- Those portions of the alpha, beta, and gamma channel circuits in Figure 4 that have corresponding circuits in Figure 2 operate in the same manner and for the same purposes as the corresponding circuits.
- divider 226 in Figure 2 performs the same function and for the same purpose as divider 426 in Figure 4.
- alpha channel 41 la it can be seen that there are no mixers and filters corresponding to mixers 230 a&b and filters 231 a&b in Figure 2.
- mixers and filters in the prior art reverse direction RASP 117 circuitry are used to translate the frequency of the reverse direction IF carrier signal used in the reverse direction alpha channel 211a circuit to an RF carrier signal for transmitting the telephony signals to Base Transceiver Station 116 in Figure 7.
- the IF carrier signal is used to carry encoded telephony signals betweenRASPs 117 and BTSs 116, so circuitry in RASP 117 to translate the intermediate frequency carrier signal to anRF carrier signal is not needed.
- alpha channel 411a there is a reduction in complexity of four circuits as described immediately above.
- beta channel 411b, and gamma channel 41 lc a total of twelve circuits are eliminated in just the reverse direction circuits.
- the cost savings in one RASP 117 is obvious, and the cost savings are increased when it is considered that there are many RASPs 117.
- FIG. 5 therein is shown a block diagram of the forward direction portion of a Remote Antenna Signal Processor (RASP) 117 incorporating the teaching of the present invention.
- RASP Remote Antenna Signal Processor
- alpha channel 534a of Figure 5 it can be seen that there is no filter and mixer corresponding to filter 332 and mixer 333 in Figure 2.
- Mixer 33 and filter 332 in the prior art forward direction RASP 117 circuitry are used to translate the forward direction RF carrier signal received from Base Transceiver Station 116 ( Figure 7) to an IF carrier signal. This also applies to forward direction beta channel 534b, and gamma channel 534c.
- alpha channel 534a there is a reduction in complexity of two circuits as described in the previous paragraph. Between alpha channel 534a, beta channel 534b, and gamma channel 534c a total of six circuits are eliminated in the forward direction RASP circuits. The cost savings in one RASP 117 is obvious, and the cost savings are increased when it is considered that there are many RASPs 117.
- FIG. 6 is shown a block diagram of a prior art Base Transceiver Station (BTS) 116 used with a wireless telephony system.
- BTS Base Transceiver Station
- Each BTS 116 has three reverse direction circuits designated alpha, beta, and gamma; and three forward direction circuits designated alpha, beta, and gamma.
- the three reverse direction circuits are all identical and the three forward direction circuits are all identical, so there is no need to show and describe the reverse direction and forward direction beta and gamma circuits to understand their operation.
- RASP Remote Antenna Signal Processor
- BTS Base Transceiver Station
- BTS Broadband Distribution Network
- the RF carrier signal received from a prior art RASP 117 in the alpha channel, modulated by an encoded telephony signal, is input to filter 647 which removes spurious signals at the input of BTS 116.
- the received signal is then amplified by amplifier 648 and input to transceiver 649.
- Transceiver 649 is used to translate the received RF carrier signal to an IF carrier signal which is input to demodulator 650.
- Demodulator 650 extracts the encoded, analog telephony signal from the IF carrier signal in a manner well-known in the art.
- the carrier signal is phase shift key modulated.
- demodulator 650 the analog, encoded telephony signal is extracted.
- the demodulated analog, encoded, telephony signal is then input to analog to digital converter 651 which digitizes the encoded analog telephony signal.
- decoder 652 which decodes the signal to obtain the digitized telephony signal which is sent to Telephone System 115.
- the type of decoding that is done depends upon the system, and the types include, but are not limited to, the well-known CDMA and GSM systems.
- RASP 117 The forward direction side of prior art RASP 117 is in the bottom row of Figure 6.
- Digitized telephony signals received from Telephone System 115 are input to encoder 653.
- the type of encoding that is done depends upon the type of system and includes, but is not limited to, the well-known CDMA and GSM systems.
- the encoded digital telephony signal is then input to digital to analog converter 654 which converts the telephony signal into an analog signal.
- the now analog, encoded telephony signal is then input to modulator 655 which, in the prior art Base Transceiver Station (BTS) 116 shown in Figure 6, phase shift key modulates an IF carrier signal in a matter well-known in the art.
- BTS Base Transceiver Station
- the IF carrier signal modulated by the analog, encoded telephony signal, is then input to transceiver 666 which translates the IF carrier signal frequency to anRF carrier signal.
- the modulated RF carrier signal is then amplified by amplifier 667, spurious signals are filtered out by filter 668 and the RF carrier signal is sent to RASP 117 in Figure 3.
- RASP 117 receives the RF carrier signal and processes it in the manner previously described with reference to Figure 3.
- BTS Base Transceiver Station
- Each BTS 116 has three reverse direction circuits designated alpha, beta, and gamma; and three forward direction circuits
- filters 647 and 668, amplifiers 648 and 667, and transceivers 649 and 666 are missing in Figure 7. These circuit elements are not needed in the modified wireless telephone system per the teaching of the present invention.
- Filter 647, amplifier 648, and transceiver 649 in the reverse direction portion of BTS 116 serve the primary function of translating the RF carrier signal received from a prior art RASP 117 to an IF carrier signal.
- Transceiver 666, amplifier 667 and filter 668 in the forward direction portion of BTS 116 serve to translate the IF carrier signal used inside each BTS to an RF carrier signal for transmission to a RASP 117.
- the IF carrier signal is used to carry the telephony signals between RASPs 117 and BTSs 116, so circuits in prior art BTS 116 used to translate the IF carrier signal to an RF carrier signal for transmission to a RASP 117 are not needed. Three circuits are thereby eliminated.
- the new forward direction RASP 117 circuitry is designed to receive an IF carrier signal fromBTS 116 per the
- transceiver 666, amplifier 667, and filter 668 in prior art BTS 116 is to translate the IF carrier signal used within BTS 116 to a RF carrier signal for transmission to a RASP 117.
- transceiver 666, amplifier 667, and filter 668 in prior art BTS 116 is to translate the IF carrier signal used within BTS 116 to a RF carrier signal for transmission to a RASP 117.
- each channel in Base Transceiver Station (BTS) 116 requires six less circuits when the teaching of present invention is implemented. With there being alpha, beta and gamma channels in the BTS 116 of Figure 7, as described hereinabove, a total of eighteen circuits are eliminated in one BTS 116. In a typical wireless telephony system there are a number of Base Transceiver Stations (BTS) 116 so the cost savings is very significant. In addition to cost savings, a simpler BTS 116 will have fewer maintenance problems which results in additional savings. Further savings are achieved by lower power consumption of each BTS 116.
- BTS Base Transceiver Station
- demodulator 750 and modulator 755 of new BTS 116 in Figure 7 may be located instead in RASP 117.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU33026/99A AU3302699A (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system |
DE69926367T DE69926367T2 (en) | 1998-02-19 | 1999-02-19 | IMPROVED CENTRALIZED EQUIPMENT FOR A WIRELESS CHANNEL SPEAKER SYSTEM AND CORRESPONDING METHOD |
CA002321207A CA2321207C (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system |
EP99934392A EP1080594B1 (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system and corresponding method |
KR1020007009162A KR20010041121A (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system |
JP2000532984A JP4426098B2 (en) | 1998-02-19 | 1999-02-19 | Improved central arrangement for wireless telephone systems. |
DK99934392T DK1080594T3 (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system and similar method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/026,274 US6301240B1 (en) | 1998-02-19 | 1998-02-19 | Centrally located equipment for wireless telephone system |
US09/026,274 | 1998-02-19 |
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WO1999043170A1 true WO1999043170A1 (en) | 1999-08-26 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US1999/003610 WO1999043170A1 (en) | 1998-02-19 | 1999-02-19 | Improved centrally located equipment for wireless telephone system |
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US (1) | US6301240B1 (en) |
EP (1) | EP1080594B1 (en) |
JP (1) | JP4426098B2 (en) |
KR (1) | KR20010041121A (en) |
AU (1) | AU3302699A (en) |
CA (1) | CA2321207C (en) |
DE (1) | DE69926367T2 (en) |
WO (1) | WO1999043170A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1080594B1 (en) | 2005-07-27 |
DE69926367D1 (en) | 2005-09-01 |
DE69926367T2 (en) | 2006-04-13 |
CA2321207C (en) | 2005-07-05 |
US6301240B1 (en) | 2001-10-09 |
AU3302699A (en) | 1999-09-06 |
CA2321207A1 (en) | 1999-08-26 |
EP1080594A4 (en) | 2003-06-18 |
JP4426098B2 (en) | 2010-03-03 |
JP2002504790A (en) | 2002-02-12 |
EP1080594A1 (en) | 2001-03-07 |
KR20010041121A (en) | 2001-05-15 |
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