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Methods and systems are disclosed for communicating in a wireless communications system utilizing a plurality of frequency bands for downlink (DL) transmission and a plurality of frequency bands for uplink (UL) transmission. In an embodiment, a mobile device receives a DL signal via a DL frequency b

Methods and systems are disclosed for communicating in a wireless communications system utilizing a plurality of frequency bands for downlink (DL) transmission and a plurality of frequency bands for uplink (UL) transmission. In an embodiment, a mobile device receives a DL signal via a DL frequency band. The DL signal contains DL-UL frequency-band association information. The DL signal is decoded to obtain the DL-UL frequency-band association information which is used to determine a UL frequency band for UL transmission. The mobile device configures its radio-frequency (RF) circuitry to operate in the UL frequency band for UL transmission.

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1. A method of communicating by a mobile device in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for upli

1. A method of communicating by a mobile device in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the method comprising: receiving a DL signal via a first DL operating frequency band of the plurality of DL operating frequency bands for DL transmission, the DL signal including DL-UL frequency band pairing information specific to a cell;decoding the DL signal to obtain the DL-UL operating frequency band pairing information;determining, based on the decoded operating DL-UL frequency band pairing information, a first UL operating frequency band of the plurality of UL operating frequency bands for UL transmission; andconfiguring radio frequency (RF) circuitry of the mobile device to operate in the determined first UL operating frequency band for UL transmission, wherein the mobile device is reconfigurable to operate using different ones of the plurality of UL operating frequency bands. 2. The method of claim 1, wherein the DL signal is received from a base station covering a cell or from a super base station covering multiple cells. 3. The method of claim 1, further comprising pairing, based on the decoded DL-UL operating frequency band pairing information, the first UL operating frequency band with the first DL operating frequency band to effectuate bidirectional communication with a base station. 4. The method of claim 1, further comprising: pairing, based on the decoded DL-UL frequency band pairing information, the first UL operating frequency band with a second DL operating frequency band of the plurality of DL operating frequency bands; andconfiguring the RF circuitry of the mobile device to operate in the second DL operating frequency band for DL data reception. 5. The method of claim 1, further comprising: pairing, based on the decoded DL-UL frequency band pairing information, a second UL operating frequency band of the plurality of UL operating frequency bands with a second DL operating frequency band of the plurality of DL operating frequency bands; andconfiguring the RF circuitry of the mobile device to operate in the second DL operating frequency band for DL data reception and in the second UL operating frequency band for UL data transmission. 6. The method of claim 1, wherein the DL signal is embedded in a DL preamble, mid-amble, or post-amble in a frame or super frame. 7. The method of claim 1, wherein the DL signal includes a message indicating a cell identity of a serving cell. 8. The method of claim 1, wherein the DL signal includes a message indicating a cell identity of a neighboring cell and a pairing of a DL operating frequency band of the plurality of DL operating frequency bands and a UL operating frequency band of the plurality of UL operating frequency bands for the neighboring cell. 9. The method of claim 1, wherein the wireless communication system is configured for Orthogonal Frequency Division Multiple Access (OFDMA) or Code Division Multiple Access (CDMA). 10. A method of communicating by a base station in a serving cell in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the method comprising: receiving an indication for the serving cell of a first DL operating frequency band of the plurality of DL frequency bands paired with a first UL operating frequency band of the plurality of UL operating frequency bands;configuring radio frequency (RF) circuitry of the base station to operate in the first DL operating frequency band for DL transmission and in the first UL operating frequency band for UL reception; andtransmitting, to a mobile device in the wireless communication system, a DL signal to indicate the pairing of the first DL operating frequency band and the first UL operating frequency band specific to the serving cell for establishing a bidirectional communication channel with a DL link and a UL link, wherein the mobile device is reconfigurable to operate using one or more of the plurality of UL operating frequency bands based on the DL signal. 11. The method of claim 10, wherein the indication is received from a network or from a control facility within the base station. 12. The method of claim 10, wherein the DL signal enables the mobile device to configure RF circuitry of the mobile device to operate in the first UL operating frequency band for UL transmission. 13. The method of claim 10, wherein the DL signal enables the mobile device to configure RF circuitry of the mobile device to operate in the first DL operating frequency band for DL reception. 14. The method of claim 10, wherein the DL signal is transmitted via the first DL operating frequency band. 15. The method of claim 10, wherein the DL signal is transmitted via a second DL operating frequency band of the plurality of DL operating frequency bands. 16. The method of claim 10, wherein the DL signal is embedded in a DL preamble, mid-amble, or post-amble in a frame or super frame. 17. The method of claim 10, wherein the DL signal includes a message indicating a cell identity of a serving cell. 18. The method of claim 10, wherein the DL signal includes a message indicating a cell identity of a neighboring cell and a pairing of a DL operating frequency band of the plurality of DL operating frequency bands and a UL operating frequency band of the plurality of UL operating frequency bands for the neighboring cell. 19. The method of claim 10, wherein the DL signal indicates a pairing of a second DL operating frequency band of the plurality of DL operating frequency bands and the first UL operating frequency band. 20. The method of claim 19, wherein the first DL operating frequency band is used for data unicasting and the second DL operating frequency band is used for data broadcasting or multicasting. 21. The method of claim 10, wherein the first DL operating frequency band is associated with a group of UL operating frequency bands of the plurality of UL operating frequency bands. 22. The method of claim 10, wherein the DL signal further indicates a pairing of a DL operating frequency band from a group of DL primary operating frequency bands and a group of DL auxiliary operating frequency bands, and a UL operating frequency band from a group of UL primary operating frequency bands and a group of UL auxiliary operating frequency bands. 23. The method of claim 22, wherein the pairing of the DL primary operating frequency bands and UL primary operating frequency band is fixed and the pairing of the DL auxiliary operating frequency bands and UL auxiliary operating frequency bands is flexible. 24. The method of claim 10, wherein the wireless communication system is configured for Orthogonal Frequency Division Multiple Access (OFDMA) or Code Division Multiple Access (CDMA). 25. A method for operating a multi-cell wireless communication system, the multi-cell wireless communications system configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the method comprising: pairing a first DL operating frequency band with a first UL operating frequency band for establishing a communication channel with a DL link and a UL link in a cell, wherein the pairing is specific to the cell and wherein the first DL operating frequency band is selected from the plurality of DL operating frequency bands for DL transmission and the first UL operating frequency band is selected from the plurality of UL operating frequency bands for UL transmission; andtransmitting a DL signal via a second DL operating frequency band of the plurality of DL operating frequency bands to announce the pairing, wherein a mobile device operating in the cell is reconfigurable to operate using one of the plurality of UL operating frequency bands based on the DL signal. 26. The method claim 25, wherein the first DL operating frequency band or the first UL operating frequency band is selected based on: an interference level in the first DL operating frequency band;an interference level in the first UL operating frequency band;application type;quality of service requirements for DL transmission;quality of service requirements for UL transmission;DL modulation and coding schemes;UL modulation and coding schemes;spatial processing methods for DL;spatial processing methods for UL;transmit power levels; ora combination thereof. 27. The method of claim 25, wherein the second DL operating frequency band is the same as the first DL operating frequency band. 28. A mobile device configured to communicate in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the mobile device comprising: at least one processor; anda memory communicatively coupled to said processor when the mobile device is operational, the memory having stored therein computer instructions that upon execution by the at least one processor cause: receiving a DL signal via a first DL operating frequency band of the plurality of DL operating frequency bands for DL transmission, the DL signal including DL-UL frequency band pairing information specific to a cell;decoding the DL signal to obtain the DL-UL frequency band pairing information;determining, based on the decoded DL-UL frequency band pairing information, a first UL operating frequency band of the plurality of UL operating frequency bands for UL transmission; andconfiguring radio frequency (RF) circuitry of the mobile device to operate in the first UL operating frequency band for UL transmission wherein the mobile device is reconfigurable to operate using one or more of the plurality of UL operating frequency bands. 29. A base station in a serving cell for communicating in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the base station comprising: a computing device comprising at least one processor; anda memory communicatively coupled to said processor when the base station is operational, the memory having stored therein computer instructions that upon execution by the at least one processor cause: receiving indication for the serving cell of a first DL operating frequency band of the plurality of DL operating frequency bands paired with a first UL operating frequency band of the plurality of UL operating frequency bands;configuring radio frequency (RF) circuitry of the base station to operate in the first DL operating frequency band for DL transmission and in the first UL operating frequency band for UL reception; andtransmitting, to a mobile device in the wireless communication system, a signal using the first DL operating frequency band, the signal indicative of the pairing of the first DL operating frequency band and the first UL frequency band specific to the serving cell, the mobile device operable for establishing a bidirectional communication channel with a DL link and a UL link based on the signal and reconfigurable to operate using one or more of the plurality of UL operating frequency bands based on the DL signal. 30. A non-transitory computer readable storage medium storing thereon computer executable instructions for communicating in a multi-cell wireless communications system, wherein the multi-cell wireless communications system is configured to utilize a plurality of operating frequency bands for downlink (DL) transmission and a plurality of operating frequency bands for uplink (UL) transmission, each operating frequency band having a center radio carrier frequency and an operation bandwidth, the computer readable storage medium comprising: instructions for pairing a first DL operating frequency band with a first UL operating frequency band for establishing a communication channel with a DL link and a UL link in a cell, wherein the pairing is specific to the cell and wherein the first DL operating frequency band is selected from the plurality of DL operating frequency bands for DL transmissions for use in the wireless communication system and the first UL operating frequency band is selected from the plurality of UL operating frequency bands for UL transmissions in the wireless communication system; andinstructions for transmitting a DL signal via a second one of the plurality of DL operating frequency bands to announce the pairing, wherein a mobile device operating in the cell is reconfigurable to operate using different ones of the plurality of UL operating frequency bands.