WO2011074013A1

WO2011074013A1 - Improved cellular radio frequency spectrum utilization

Info

Publication number: WO2011074013A1
Application number: PCT/IN2010/000822
Authority: WO
Inventors: Rajiv Mehrotra
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-12-16
Filing date: 2010-12-16
Publication date: 2011-06-23
Anticipated expiration: 2012-06-16
Also published as: AP2012006369A0; CA2784833A1; RU2012125166A; BR112012015011A2

Abstract

An apparatus, system and method for effective radio frequency spectrum allocation in a multi-system cellular communication network. According to the present disclosure a Base Transceiver Station, User Equipment and Base Station Controller of a cellular communication network includes at least one pair of radio frequency transceivers. The transmitter of the RF TRXs (radio frequency transceivers) is configured to operate in a downlink frequency from any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRXs is configured to operate in an uplink frequency from another one of said guard band. Further, the transmitter or receiver of the RF TRXs is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz. Similarly, the transmitter or receiver of the RF TRXs is configured to operate in a frequency band outside of all said guard bands. The outside frequency bands are: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

Description

IMPROVED CELLULAR RADIO FREQUENCY SPECTRUM UTILIZATION

Cross-Reference to related Application

This application is a patent of addition to Indian Patent Application No. 1404/DEL/2008 filed on June 13, 2008, titled "A METHOD AND ARCHITECTURE FOR PAIRING OF GUARD BAND FREQUENCIES FOR EFFECTING DUPLEXED CELLULAR MOBILE TELECOMMUNICATION SERVICES LIKE GSM, CDMA, UMTS & WCDMA". The entire contents of Indian Patent Application No. 1404 DEL/2008 are incorporated herein by reference in their entirety.

Technical Field

The present disclosure relates to the field of wireless communication systems and, more specifically, to embodiments of an apparatus, system and method for improved cellular radio frequency spectrum utilization.

Glossary

Uplink - pertaining to cellular networks, the radio uplink is the transmission path from the user equipment (Mobile Station or Cell Phone) to a Base Transceiver Station.

Downlink - pertaining to cellular networks, the radio downlink is the transmission path from a Base Transceiver Station to the user equipment (Mobile Station or Cell Phone). In-Band frequencies - are given as 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

Guard band frequencies - are given as 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz Background

The radio frequency spectrum is a finite resource and its utilization is regulated by national and international bodies. Owing to the scarcity of this resource in comparison with its demand, there is a need for improving its utilization by effective spectrum allocation with adequate planning and management. The International Telecommunication 'Union (ITU) has segregated the world into three regions for the purpose of such allocation. The Indian subcontinent falls under Region 3 of such segregation, while Europe and Africa fall under Region 1 and America falls under Region 2. Considering Region 3, the complete frequency spectrum is divided into lower frequency band ranging from 800 to 1000 MHz allocated for fixed, mobile and broadcasting services such as Global System for Mobile communications (GSM) 850, GSM 900, 850 Wideband Code Division Multiple Access (WCDMA) and higher frequency band ranging from 1700 to 2200 MHz allocated for Digital Communications System (DCS) or GSM 1800, Personal Communications Services (PCS) or PCS WCDMA (or Universal Mobile Telecommunications System (UMTS)).

Further, the frequency spectrum includes unutilized bands known as "Guard Bands". A guard band is an unused part of the frequency spectrum between radio frequency bands, for the purpose of preventing interference. It may be used in both wired and wireless communications to avoid interference between adjacent frequency bands on the same media. However, at present these guard bands have been left unutilized in cellular communication.

Figure 1 shows band allocation and deployment for up-link and down-link in a frequency spectrum for GSM900 cellular system. The frequency band from 890 to 935 MHz represented as 101 is the 45 MHz spectrum allocation in this system. The frequency band from 890 MHz to 915 MHz represented as 102 is the 25 MHz uplink band. The frequency band from 935 MHz to 960 MHz represented as 103 is the allocated 25 MHz downlink band. The 915 MHz to 935 MHz spectrum represented as 104 is the unutilized 20 MHz, defined as the Guard Band [in this case Band RMA].

Figure 2 shows band allocation and deployment for up-link and down-link in a frequency spectrum for DCS cellular system. The frequency band from 1710 to 1805 MHz represented as 201 is the 95 MHz spectrum allocation for this system. The frequency band from 1710 MHz to 1785 MHz represented as 202 is the allocated 75 MHz for uplink requirements. The frequency band from 1805 MHz to 1880 MHz represented as 203 is the allocated 75 MHz for downlink requirements. The frequency band from 1785 MHz to 1805 MHz represented as 204 is the unutilized 20 MHz Guard Band [in this case Band RMB].

Figure 3 shows band allocation and deployment for up-link and down-link in a frequency spectrum for CDMA 2000. The frequency band from 824 to 869 MHz represented as 301 is the 45 MHz spectrum for this system. The frequency band from 825 MHz to 849 MHz represented as 302 is the 25 MHz allocated for uplink. The frequency band from 869 MHz to 894 MHz represented as 303 is the 25 MHz allocated for the downlink requirement. The frequency band from 849 MHz to 869 MHz represented as 304 is the unutilized 20 MHz Guard Band, known as Band RMC]. Figure 4 shows band allocation and deployment for up-link and down-link in a cellular frequency band for the PCS cellular system. The frequency band from 1850 to 1930 MHz represented as 401 is the 80 MHz spectrum allocated for this system. The frequency band from 1850 MHz to 1910 MHz represented as 402 is the 60 MHz for facilitating uplink. The frequency band from 1930 MHz to 1990 MHz represented as 403 is the 60 MHz for the downlink requirements. The frequency band from 1910 MHz to 1930 MHz represented as 404 is the unutilized Guard Band of 20 MHz[in this case Band RMD].

Figure 5 illustrates an integration of multiple systems in a wireless communication system according to conventional art. A BTS (Base Transceiver Station) represented as 501 is an equipment that facilitates wireless communication between user equipment (such as a mobile station or mobile handset or user terminal) 502 and a network. The network can be that of any of the wireless communication technologies such as GSM, CDMA, WLL, WAN, WiFi, WiMAX etc. A BTS is controlled by a Base Station Controller (BSC) represented as 503. The BSC controls several BTSs including handling of allocation of radio channels, receives measurements from the mobile phones and controls handovers from BTS to BTS. BSCs are located near the BTSs controlled by them and are in turn connected to large centralized MSC (Main Switching Centers) sites.

Figure 6 illustrates the internal structure of Base Transceiver stations (BTSs) according to conventional art. A BTS (Base Transceiver Station) 601 may have one or more radio frequency transceiver (RF TRX) where each radio frequency transceiver 602 comprises radios that are tuned to transmit and receive frequencies according to any of the wireless communication technologies such as GSM, CDMA, WLL, WAN, WiFi, WiMAX etc. In existing cellular architectures, the receiver and transmitter of the RF TRXs operate in any one of the cellular frequency bands 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. The Base Band transceiver 603 performs functions such as frequency hopping and signal processing Further, a control unit 604 is provided to control and manage various control functions in the BTS. Figure 7 illustrates the internal configuration of User Terminal Equipment (UE) according to conventional art. A UE 701 has one or more radio frequency transceivers (RF TRXs) 702 which allow it to serve on one or more RF channels. Each radio frequency transceiver 702 comprises a radio transmitter tuned to an uplink frequency and a radio receiver tuned to a corresponding downlink frequency according to any of the wireless communication technologies like GSM, CDMA, WLL, WAN, WiFi, WiMAX etc. In the current user equipment, the receiver and transmitter of the RF TRXs operate in any one of the cellular frequency bands namely 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. The Base Band transceiver 703 performs functions such as frequency hopping and signal processing. Further, a control unit 704 is provided inside the UE to control and manage various control functions of the system. Also a User Interface (UI) 705 is provided to facilitate the interaction of a user with the system.

Guard bands RMA, RMB, RMC and RMD as mentioned in the above description remain completely unutilized in cellular communication. This amounts to a sub optimal utilization of the radio frequency spectrum. Summary

The present disclosure provides an effective radiofrequency allocation of the unassigned guard bands in multi-system cellular communication networks.

According to an embodiment of the present disclosure, a Base Transceiver Station in a cellular communication network comprising: at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency. The transmitter of RF TRX (radio frequency transceivers) is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRX is configured to operate in an uplink frequency within another one of said guard band. Further, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz.

Another embodiment of the present disclosure, a user equipment in a cellular communication network comprising: at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency. The transmitter of RF TRX (radio frequency transceivers) is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRX is configured to operate in an uplink frequency within another one of said guard band. Further, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz.

Another embodiment of the present disclosure, a Base Station controller in a cellular communication network comprising: at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency. The transmitter of RF TRX (radio frequency transceivers) is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRX is configured to operate in an uplink frequency within another one of said guard band. Further, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz.

Another embodiment of the present disclosure, a cellular communication network comprising: a base station transceiver station, comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency; a user equipment comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency; and a base station controller, comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency.

Another embodiment of the present disclosure refers to a method of cellular communication comprising utilization of at least one guard band frequency for uplink and/or downlink communication between User Equipment (UE) and Base Transceiver Stations (BTS), and/or between BTS and Base Station Controllers (BSC). The uplink frequency is configured to a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said downlink frequency are configured to a frequency band corresponding to another one of said guard bands. Further, the uplink/downlink frequency is configured to a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said downlink/uplink frequency are configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. The receiving frequency is configured to a frequency band within any one of the guard band frequencies: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said transmitting frequency is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

Brief Description of the Drawings

These and other features and aspects of the various embodiments of the disclosure will be better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings:

FIGURE 1 shows band allocation and deployment for up-link and down-link in a frequency spectrum for GSM900 cellular system according to conventional art. FIGURE 2 shows band allocation and deployment for up-link and down-link in a frequency spectrum for DCS cellular system according to conventional art.

FIGURE 3 shows band allocation and deployment for up-link and down-link in a frequency spectrum for CDMA2000 cellular system according to conventional art.

FIGURE 4 shows band allocation and deployment for up-link and down-link in a frequency spectrum for PCS cellular system according to conventional art.

FIGURE 5 illustrates integration of multiple systems in a cellular communication system according to conventional art.

FIGURE 6 illustrates internal structure of Base Transceiver stations (BTSs) according to conventional art.

FIGURE 7 illustrates internal structure of User Terminal Equipment (UE) according to conventional art.

FIGURE 8 illustrates internal structure of Base Transceiver stations (BTSs) according to an embodiment of the present disclosure.

FIGURE 9 illustrates internal structure of User Terminal Equipment (UE) according to an embodiment of the present disclosure.

FIGURE 10 shows band allocation and deployment for up-link and down-link according to an embodiment of the present disclosure.

FIGURE 11 shows band allocation and deployment for up-link and down-link according to another embodiment of the present disclosure. While the disclosure will be described in conjunction with the illustrated embodiment, it will be understood that it is not intended to limit the disclosure to such embodiment. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the disclosure as defined by the appended claims.

Detailed Description of the Disclosure

The embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein in the art of the present disclosure. The disclosure is described with reference to specific circuits, block diagrams, signals, etc. simply to provide a more thorough understanding of the disclosure.

It should be understood that embodiments of the present disclosure may be included in various types of wireless communication systems intended to be within the scope of the present disclosure, although not limited to, Wireless Local Area Network (WLAN), Wireless Wide Area Network (WWAN), Code Division Multiple Access (CDMA) cellular radiotelephone communication systems, Global System for Mobile Communications (GSM) cellular radiotelephone systems, North American Digital Cellular (NADC) cellular radiotelephone systems, Time Division Multiple Access (TDMA) systems, Extended-TDMA (E-TDMA) cellular radiotelephone systems, third generation (3G) systems like wide-band CDMA (WCDMA), CDMA-2000, and the like, although the scope of the disclosure is not limited in this respect.

Figure 8 illustrates internal structure of Base Transceiver stations (BTSs) according to an embodiment of the present disclosure. A BTS (Base Transceiver Station) 801 comprises several transceivers (RF TRXs) which allows it to operate in uplink and downlink frequencies. The radio frequency transceiver 802 according to a preferred embodiment of the present disclosure comprises two different radios for transmitter and receiver tuned to operate in downlink and uplink frequencies according to any of the wireless communication technologies such as GSM, CDMA, LTE, WLL, WAN, WiFi and WiMAX. In the preferred embodiment, the transmitter of RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of each RF TRX is configured to operate in an uplink frequency within another one of said guard bands. The Base Band transceiver 803 performs several functions such as frequency hopping and signal processing. Further, a control unit 804 is provided inside BTS to control and manage various control functions of units in the BTS. It will be appreciated by those having ordinary skill in the art that radios in the transmitter and receiver as described in the present disclosure will have comparable arrangements for similar kind of transmitters and receivers present in a multi-mode BTS.

According to another embodiment of the present disclosure, the transmitter in the RF TRX of the BTS is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the-receiver in the RF TRX of the BTS is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX of the BTS is configured to operate in a downlink frequency from any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX of the BTS is configured to operate in an uplink frequency from any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz

Figure 9 illustrates internal structure of User Terminal Equipment (UE) according to an embodiment of the present disclosure. User equipment (UE) 901 comprises several transceivers (RF TRXs) which allows it to operate in uplink and downlink frequencies. The radio frequency transceiver 902 according to a preferred embodiment of the present disclosure comprises two different radios for transmitter and receiver tuned to transmit and receive frequencies according to any of the wireless communication technologies such as GSM, CDMA, LTE, WLL, WAN, WiFi, WiMAX etc. In the preferred embodiment, the transmitter of RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRX is configured to operate in an uplink frequency within another one of said guard bands. The Base Band transceiver 903 performs several functions such as frequency hopping and signal processing. Further, a control unit 904 is provided inside the user equipment to control and manage various control functions of units in the user equipment. A User Interface (UI) 905 is provided to facilitate the interaction of user with the BTS. It will be appreciated by those having ordinary skill in the art that radios in the transmitter and receiver as described in the present disclosure will have comparable arrangements for similar kind of transmitters and receivers present in multi-band user equipments.

According to another embodiment of the present disclosure, the transmitter in the RP TRX of the UE is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX of the UE is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX of the UE is configured to operate in a downlink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX of the UE is configured to operate in an uplink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz

Figure 10 shows band allocation and deployment for up-link and down-link according to an embodiment of the present disclosure. The radios of transmitter and receiver of the configured Base station and the configured user equipment as disclosed in previous embodiments of the present disclosure are configured respectively. The transmitter of each RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz while the receiver of each RF TRX is configured to operate in an uplink frequency within another one of said guard bands. Further, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX is configured to operate in a downlink frequency within any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX is configured to operate in an uplink frequency within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz. In an exemplary embodiment of the disclosure, the radios of transmitter and receiver of the configured Base station and the configured user equipment as disclosed in previous embodiments of the present disclosure are configured either with guard Band RMA (915 to 935 MHz) represented as 104 in Figure 1, or with guard Band RMB (1785 to 1805 MHz) represented as 204 in Figure 2, or with any one of the frequency bands 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz or 1850 to 1990 MHz respectively for affecting an interspersed cellular telecommunication system. In this embodiment, lower frequency band is utilized for the uplink, and the higher frequency band is utilized for downlink.

Figure 11 shows band allocation and deployment for up-link and down-link in accordance with yet another embodiment of the present disclosure. In an exemplary embodiment of the disclosure, the radios of transmitter and receiver of the configured Base station and the configured user equipment (described as embodiments previously) are paired either with guard Band RMC (849 to 869 MHz) represented as 304in Figure 3 or with guard Band RMD (1910 to 1930MHz) represented as 404 in Figure 4, or with any one of the frequency bands 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz or 1850 to 1990 MHz respectively for affecting an interspersed cellular telecommunication system. In this embodiment, lower frequency band is utilized for the uplink, and the higher frequency band is utilized for downlink.

It will be appreciated by those having ordinary skill in the art that radios present in wireless transmitter/receiver pair are co-located at the cellular base station transceiver and the other end of the link i.e. another transmitter/receiver pair located in a base station switching controller within the cellular transport network for cellular backhaul communication. According to one of such embodiment, where transceivers (TRXs) are present in the BSC may have following arrangements: the transmitter of such RF TRX is configured to operate in a downlink frequency from any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and the receiver of the RF TRX is configured to operate in uplink frequency from another one of said guard bands. According to another embodiment of the present disclosure, the transmitter in the RF TRX is configured to operate in downlink frequency from any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz and the receiver in the RF TRX is configured to operate in uplink frequency from any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz. Similarly, the transmitter in the RF TRX is configured to operate in downlink frequency from any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz and the receiver in the RF TRX is configured to operate in uplink frequency from any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz

In the present disclosure, the embodiments of an apparatus, system and method for leads to an improved efficiency of the spectrum utilization. The disclosure also allows to support an improved number of cellular hand held devices per unit of spectrum, as well as lower costs of roll out and running costs of the cellular telecommunications system.

The present disclosure is applicable to all types of PGSM/EGSM 900 MHz and DCS 1800 MHz Bands, as also in US Cellular Bands and US PCS Bands, for effecting duplexed cellular telecommunication services like I-Den, GSM, PGSM, EGSM, CDMA, CDMA 2000, UMTS & WCDMA and any other duplexed use in the guard bands.

Although the disclosure of the instant disclosure has been described in connection with the embodiment of the present disclosure illustrated in the accompanying drawings, it is not limited thereto. It will be apparent to those skilled in the art that various substitutions, modifications and changes may be made thereto without departing from the scope and spirit of the disclosure.

The various embodiments described above can be combined to provide further embodiments. All of the U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet are incorporated herein by reference, in their entirety. Aspects of the embodiments can be modified, if necessary to employ concepts of the various patents, applications and publications to provide yet further embodiment.

These and other changes can be made to the embodiments in light of the above- detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.

Claims

We Claim:

1. A Base Transceiver Station in a cellular communication network comprising :

- at least one pair of radio transmitter and receiver; and

- at least one of said transmitter and/or receiver configured to operate in a guard band frequency.

2. The station as claimed in claim 1, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in a frequency band within another one of said guard band.

3. The station as claimed in claim 1, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

4. The station as claimed in claim 1, wherein said receiver is configured to operate in a frequency band within any one of the guard band frequencies: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said transmitter is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

5. A user equipment in a cellular communication network comprising:

- at least one pair of radio transmitter and receiver; and - at least one of said transmitter and/or receiver configured to operate in a guard band frequency.

The user equipment as claimed in claim 5, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in a frequency band within another one of said guard band.

7. The user equipment as claimed in claim 5, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz,

1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

8. The user equipment as claimed in claim 5, wherein said receiver is configured to operate in a frequency band within any one of the guard band frequencies: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said transmitter is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

9. A base station controller in a cellular communication network comprising: - at least one pair of radio transmitter and receiver; and - at least one of said transmitter and/or receiver configured to operate in a guard band frequency.

10. The controller as claimed in claim 9, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in a frequency band within another one of said guard band.

11. The controller as claimed in claim 9, wherein said transmitter is configured to operate in a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said receiver is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

12. The controller as claimed in claim 9, wherein said receiver is configured to operate in a frequency band within any one of the guard band frequencies: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said transmitter is configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

13. A cellular communication network comprising:

- a base station transceiver station, comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency;

- a user equipment comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency; and

- a base station controller, comprising at least one pair of radio transmitter and receiver; and at least one of said transmitter and/or receiver configured to operate in a guard band frequency.

14. A method of cellular communication comprising utilization of at least one guard band frequency for uplink and/or downlink communication between User Equipment (UE) and Base Transceiver Stations (BTS), and/or between BTS and Base Station Controllers (BSC).

15. The method as claimed in claim 14, wherein said uplink frequency is configured to a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said downlink frequency is configured to a frequency band corresponding to another one of said guard bands.

16. The method as claimed in claim 14, wherein said uplink/downlink frequency is configured to a frequency band within any one of the guard bands: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said downlink/uplink frequency are configured to operate in any one of the frequency bands: 890 to 960 MHz, 1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.

17. The method as claimed in claim 14, wherein said receiving frequency is configured to a frequency band within any one of the guard band frequencies: 915 to 935 MHz, 1785 to 1805 MHz, 849 to 869 MHz, and 1910 to 1930MHz; and said transmitting frequency is configured to operate in any one of the frequency bands: 890 to 960 MHz,

1710 to 1880 MHz, 824 to 894 MHz and 1850 to 1990 MHz.