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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 for communicating by a base station serving a mobile device in a wireless communication system employing a plurality of radio frames, wherein the radio frames comprise a plurality of subframes, the subframes comprising a plurality of time slots, the time slots comprising multiple orthogo

1. A method for communicating by a base station serving a mobile device in a wireless communication system employing a plurality of radio frames, wherein the radio frames comprise a plurality of subframes, the subframes comprising a plurality of time slots, the time slots comprising multiple orthogonal frequency division multiplex (OFDM) symbols, the base station having a plurality of radio-frequency (RF) circuits, the method comprising: transmitting, in a first duplexing mode, control information to the mobile device over a first RF band, the control information indicative of a second RF band for transmitting signals by the base station in a second duplexing mode; andcontrolling the plurality of RF circuits to concurrently transmit signals in a first radio frame in the first duplexing mode over the first RF band and in a second radio frame in the second duplexing mode over the second RF band;wherein at least one of the first RF band and the second RF band is allowed to be used by systems operating with different multiple access technologies;wherein the first radio frame and the second radio frame have a same frame length and are aligned with each other in time; andwherein the first duplexing mode operates in frequency and the second duplexing mode operates in time, or the first duplexing mode operates in time and the second duplexing mode operates in frequency. 2. The method of claim 1, wherein an RF circuit of the plurality of RF circuits comprises an RF filter, frequency multiplexer, amplifier, mixer, switch, oscillator, or synthesizer. 3. The method of claim 1, wherein the control information indicative of the second RF band is provided in a bit field or a bitmap. 4. The method of claim 1, wherein the control information indicative of the second RF band is provided as an index or a control message. 5. The method of claim 1, wherein the wireless communication system is configured for Orthogonal Frequency Division Multiple Access (OFDMA). 6. A base station configured to communicate with a mobile device in a wireless communication system employing a plurality of radio frames, wherein the radio frames comprise a plurality of subframes, the subframes comprising a plurality of time slots, the time slots comprising multiple orthogonal frequency division multiplex (OFDM) symbols, the base station having a plurality of radio-frequency (RF) circuits, the base station 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: transmitting, in a first duplexing mode, control information to the mobile device over a first RF band, the control information indicative of a second RF band for transmitting signals by the base station in a second duplexing mode; andcontrolling the plurality of RF circuits to concurrently transmit signals in a first radio frame in the first duplexing mode over the first RF band and in a second radio frame in the second duplexing mode over the second RF band;wherein at least one of the first RF band and the second RF band is allowed to be used by systems operating with different multiple access technologies;wherein the first radio frame and the second radio frame have a same frame length and are aligned with each other in time; andwherein the first duplexing mode operates in frequency and the second duplexing mode operates in time, or the first duplexing mode operates in time and the second duplexing mode operates in frequency. 7. The base station of claim 6, wherein an RF circuit of the plurality of RF circuits comprises an RF filter, frequency multiplexer, amplifier, mixer, switch, oscillator, or synthesizer. 8. The base station of claim 6, wherein the control information indicative of the second RF band is provided in a bit field or a bitmap. 9. The base station of claim 6, wherein the control information indicative of the second RF band is provided as an index or a control message. 10. The base station of claim 6, wherein the wireless communication system is configured for Orthogonal Frequency Division Multiple Access (OFDMA). 11. A base station serving a mobile device in a wireless communication system configured to communicate using a plurality of radio frames, wherein a radio frame of the plurality of radio frames comprises a plurality of subframes, wherein a subframe of the plurality of subframes comprises a plurality of time slots, and a time slot of the plurality of time slots comprises multiple orthogonal frequency division multiplex (OFDM) symbols, the base station having a plurality of radio-frequency (RF) circuits, the base station configured to: transmit control information to the mobile device over a first RF band using a first duplexing mode, the control information indicative of a second RF band for transmitting signals to the mobile device using a second duplexing mode; andoperate the plurality of RF circuits to concurrently transmit signals in a first radio frame in the first duplexing mode over the first RF band and in a second radio frame in the second duplexing mode over the second RF band;wherein at least one of the first RF band and the second RF band is operable to be used by systems operating with different multiple access technologies;wherein the first radio frame and the second radio frame have a same frame length and are aligned with each other in time; andwherein the first duplexing mode operates in frequency and the second duplexing mode operates in time, or the first duplexing mode operates in time and the second duplexing mode operates in frequency. 12. A non-transitory computer readable storage medium storing thereon computer executable instructions for communicating by a base station with a mobile device in a wireless communication system employing a plurality of radio frames, wherein the radio frames comprise a plurality of subframes, the subframes comprising a plurality of time slots, the time slots comprising multiple orthogonal frequency division multiplex (OFDM) symbols, the base station having a plurality of radio-frequency (RF) circuits, the computer readable storage medium comprising: instructions for transmitting, in a first duplexing mode, control information to the mobile device over a first RF band, the control information indicative of a second RF band for transmitting signals by the base station in a second duplexing mode; andinstructions for engaging the plurality of RF circuits to concurrently transmit signals in a first radio frame in the first duplexing mode over the first RF band and in a second radio frame in the second duplexing mode over the second RF band;wherein systems operating with different multiple access technologies are allowed to use at least one of the first RF band and the second RF band;wherein the first radio frame and the second radio frame have a same frame length and are aligned with each other in time; andwherein the first duplexing mode operates in frequency and the second duplexing mode operates in time, or the first duplexing mode operates in time and the second duplexing mode operates in frequency.