# US 11,310,795 B2 · Methods and apparatus for flexible use of frequency bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,795 B2 - Document ID: US11310795B2 - Status: Granted - Kind: B2 - Application number: 15/831,310 - Filed: 2017-12-04 - Published: 2018-06-07 - Granted: 2022-04-19 - Earliest claimed: 2010-09-28 - Assignees: Neo Wireless LLC - Applicants: Neo Wireless LLC - Inventors: Titus Lo; Xiaodong Li - Web page: https://patentgrep.com/patent/US11310795B2 ## CPC - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 24/02: Arrangements for optimising operational condition - H04W 48/16: Discovering, processing access restriction or access information - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/20: Control channels or signalling for resource management - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 41/044: comprising hierarchical management structures - H04L 41/082: the condition being updates or upgrades of network functionality - H04L 41/40: using virtualisation of network functions or resources, e.g. SDN or NFV entities - H04L 43/0817: by checking functioning - H04L 43/10: Active monitoring, e.g. heartbeat, ping or trace-route - H04L 63/20: {for managing network security; network security policies in general (filtering policies H04L63/0227)} - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract 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. ## Claims ### Claim 1 A communication method implemented in a communication system serving a plurality of mobile devices, wherein the communication system utilizes a plurality of carriers for communication with a mobile device of the plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the method comprising: transmitting, to the mobile device, broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; receiving UL signals over the non-primary UL carrier and over the primary UL carrier; and transmitting a DL signal to the mobile device over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 2 (depends on 1) The method of claim 1, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 3 (depends on 1) The method of claim 1, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 4 (depends on 1) The method of claim 1, further comprising transmitting control information to the mobile device over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 5 (depends on 4) The method of claim 4, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 6 (depends on 4) The method of claim 4, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 7 (depends on 4) The method of claim 4, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 8 (depends on 4) The method of claim 4, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 9 (depends on 1) The method of claim 1 further comprising transmitting a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 10 (depends on 1) The method of claim 1, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 11 (depends on 1) The method of claim 1, further comprising receiving a UL signal over the at least one of the one or more TDD carriers. ### Claim 12 (depends on 11) The method of claim 11, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 13 (depends on 12) The method of claim 12, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 14 (depends on 13) The method of claim 13, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 15 A communication system serving a plurality of mobile devices, wherein the communication system utilizes a plurality of carriers for communication with a mobile device of the plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the communication system comprising: at least one processor; and a memory communicatively coupled to said processor when the communication system is operational, the memory having stored therein computer executable instructions that upon execution by the at least one processor cause the communication system to: transmit, to the mobile device, broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; receive UL signals over the non-primary UL carrier and over the primary UL carrier; and transmit a DL signal to the mobile device over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 16 (depends on 15) The communication system of claim 15, further comprising a plurality of radio frequency (RF) circuits, wherein an RF circuit of the plurality of RF circuits comprises an RF filter, a frequency multiplexer, an amplifier, a mixer, a switch, an oscillator, or a synthesizer. ### Claim 17 (depends on 15) The communication system of claim 15, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 18 (depends on 15) The communication system of claim 15, wherein the computer executable instructions, when executed by the at least one processor, further cause the communication system to: transmit control information to the mobile device over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 19 (depends on 18) The communication system of claim 18, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 20 (depends on 18) The communication system of claim 18, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 21 (depends on 18) The communication system of claim 18, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 22 (depends on 18) The communication system of claim 18, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 23 (depends on 15) The communication system of claim 15, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 24 (depends on 15) The communication system of claim 15, wherein the computer executable instructions, when executed by the at least one processor, further cause the communication system to: transmit a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 25 (depends on 15) The communication system of claim 15, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 26 (depends on 15) The communication system of claim 15, wherein the computer executable instructions upon execution by the at least one processor further cause the communication system to: receive a UL signal over the at least one of the one or more TDD carriers. ### Claim 27 (depends on 26) The communication system of claim 26, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 28 (depends on 27) The communication system of claim 27, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 29 (depends on 28) The communication system of claim 28, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 30 A communication system serving a plurality of mobile devices, wherein the communication system utilizes a plurality of carriers for communication with a mobile device of the plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the communication system comprising: a transmitter configured to transmit, to the mobile device, broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; and a receiver configured to receive UL signals over the non-primary UL carrier and over the primary UL carrier; wherein the transmitter is further configured to transmit a DL signal to the mobile device over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 31 (depends on 30) The communication system of claim 30, wherein the transmitter is further configured to: transmit control information to the mobile device over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 32 (depends on 31) The communication system of claim 31, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 33 (depends on 31) The communication system of claim 31, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 34 (depends on 31) The communication system of claim 31, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 35 (depends on 31) The communication system of claim 31, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 36 (depends on 30) The communication system of claim 30, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 37 (depends on 30) The communication system of claim 30, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 38 (depends on 30) The communication system of claim 30, further comprising a plurality of radio frequency (RF) circuits, wherein an RF circuit of the plurality of RF circuits comprises an RF filter, a frequency multiplexer, an amplifier, a mixer, a switch, an oscillator, or a synthesizer. ### Claim 39 (depends on 30) The communication system of claim 30, wherein the transmitter is further configured to: transmit a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 40 (depends on 30) The communication system of claim 30, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 41 (depends on 30) The communication system of claim 30, wherein the receiver is further configured to: receive a UL signal over the at least one of the one or more TDD carriers. ### Claim 42 (depends on 41) The communication system of claim 41, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 43 (depends on 42) The communication system of claim 42, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 44 (depends on 43) The communication system of claim 43, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 45 A non-transitory computer readable storage medium storing thereon computer executable instructions for execution by one or more processors, the non-transitory computer readable storage medium comprising: instructions for utilizing a plurality of carriers for communication with a mobile device of a plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, wherein the utilizing includes: transmitting, to the mobile device, broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; receiving UL signals over the non-primary UL carrier and over the primary UL carrier; and transmitting a DL signal to the mobile device over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 46 (depends on 45) The non-transitory computer readable storage medium of claim 45 further comprising: instructions for transmitting control information to the mobile device over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 47 (depends on 46) The non-transitory computer readable storage medium of claim 46, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 48 (depends on 46) The non-transitory computer readable storage medium of claim 46, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 49 (depends on 46) The non-transitory computer readable storage medium of claim 46, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 50 (depends on 46) The non-transitory computer readable storage medium of claim 46, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 51 (depends on 45) The non-transitory computer readable storage medium of claim 45, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 52 (depends on 45) The non-transitory computer readable storage medium of claim 45, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 53 (depends on 45) The non-transitory computer readable storage medium of claim 45 further comprising: instructions for transmitting a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 54 (depends on 45) The non-transitory computer readable storage medium of claim 45, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 55 (depends on 45) The non-transitory computer readable storage medium of claim 45 further comprising: instructions for receiving a UL signal over the at least one of the one or more TDD carriers. ### Claim 56 (depends on 55) The non-transitory computer readable storage medium of claim 55, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 57 (depends on 56) The non-transitory computer readable storage medium of claim 56, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 58 (depends on 57) The non-transitory computer readable storage medium of claim 57, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 59 A method for a mobile device in communication with a communication system that utilizes a plurality of carriers for communication with a mobile device of a plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the method comprising: receiving broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; transmitting UL signals over the non-primary UL carrier and over the primary UL carrier; and receiving a DL signal over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 60 (depends on 59) The method of claim 59 further comprising receiving a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 61 (depends on 59) The method of claim 59 further comprising: receiving control information over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 62 (depends on 61) The method of claim 61, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 63 (depends on 61) The method of claim 61, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 64 (depends on 61) The method of claim 61, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 65 (depends on 61) The method of claim 61, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 66 (depends on 59) The method of claim 59, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 67 (depends on 59) The method of claim 59, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 68 (depends on 59) The method of claim 59, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 69 (depends on 59) The method of claim 59, further comprising: transmitting a UL signal over the at least one of the one or more TDD carriers. ### Claim 70 (depends on 69) The method of claim 69, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 71 (depends on 70) The method of claim 70, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 72 (depends on 71) The method of claim 71, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 73 A mobile device in communication with a communication system that utilizes a plurality of carriers for communication with a mobile device of a plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the mobile device comprising: a receiver configured to receive broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; and a transmitter configured to transmit UL signals over the non-primary UL carrier and over the primary UL carrier; wherein the receiver is further configured to receive a DL signal over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 74 (depends on 73) The mobile device of claim 73 wherein the receiver is further configured to receive a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 75 (depends on 73) The mobile device of claim 73, wherein the receiver is further configured to receive control information over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 76 (depends on 75) The mobile device of claim 75, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 77 (depends on 75) The mobile device of claim 75, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 78 (depends on 75) The mobile device of claim 75, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 79 (depends on 75) The mobile device of claim 75, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 80 (depends on 73) The mobile device of claim 73, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 81 (depends on 73) The mobile device of claim 73, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 82 (depends on 73) The mobile device of claim 73, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 83 (depends on 73) The mobile device of claim 73, wherein the transmitter is further configured to: transmit a UL signal over the at least one of the one or more TDD carriers. ### Claim 84 (depends on 83) The mobile device of claim 83, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 85 (depends on 84) The mobile device of claim 84, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 86 (depends on 85) The mobile device of claim 85, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 87 A non-transitory computer readable storage medium storing thereon computer executable instructions for execution by one or more processors, the non-transitory computer readable storage medium comprising: instructions for utilizing a plurality of carriers for communication with a communication system, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, wherein the utilizing includes: receiving broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non- primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; transmitting UL signals over the non-primary UL carrier and over the primary UL carrier; and receiving a DL signal over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 88 (depends on 87) The non-transitory computer readable storage medium of claim 87 further comprising: instructions for receiving control information over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 89 (depends on 88) The non-transitory computer readable storage medium of claim 88, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 90 (depends on 88) The non-transitory computer readable storage medium of claim 88, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 91 (depends on 88) The non-transitory computer readable storage medium of claim 88, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 92 (depends on 88) The non-transitory computer readable storage medium of claim 88, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 93 (depends on 87) The non-transitory computer readable storage medium of claim 87, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 94 (depends on 87) The non-transitory computer readable storage medium of claim 87, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 95 (depends on 87) The non-transitory computer readable storage medium of claim 87 further comprising: instructions for receiving a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 96 (depends on 87) The non-transitory computer readable storage medium of claim 87, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 97 (depends on 87) The non-transitory computer readable storage medium of claim 87 further comprising: instructions for transmitting a UL signal over the at least one of the one or more TDD carriers. ### Claim 98 (depends on 97) The non-transitory computer readable storage medium of claim 97, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 99 (depends on 98) The non-transitory computer readable storage medium of claim 98, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 100 (depends on 99) The non-transitory computer readable storage medium of claim 99, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers. ### Claim 101 A communication system serving a plurality of mobile devices, wherein the communication system utilizes a plurality of carriers for communication with a mobile device of the plurality of mobile devices, the plurality of carriers including one or more time division duplex (TDD) carriers and a plurality of downlink (DL) carriers paired with a plurality of uplink (UL) carriers, the communication system comprising: a first transmitter configured to transmit, to the mobile device, broadcast information indicating a pairing between the plurality of DL carriers and the plurality of UL carriers, wherein one of the plurality of DL carriers is a primary DL carrier and one of the plurality of UL carriers is a primary UL carrier, and wherein at least one of the plurality of DL carriers is a non-primary DL carrier and at least one of the plurality of UL carriers is a non-primary UL carrier, wherein a first carrier of the plurality of carriers for communication has a wider bandwidth than a second carrier of the plurality of carriers for communication and signals transmitted via the first carrier of the plurality of carriers have an increased subcarrier spacing in frequency and shorter orthogonal frequency division multiplex (OFDM) symbols in time than signals transmitted via the second carrier of the plurality of carriers for communication; a first receiver configured to receive UL signals over the non-primary UL carrier and over the primary UL carrier; and a second transmitter configured to transmit a DL signal to the mobile device over at least one of the one or more TDD carriers and another DL signal over the primary or non-primary DL carrier at least in-part contemporaneously. ### Claim 102 (depends on 101) The communication system of claim 101, wherein the first transmitter is further configured to: transmit control information over the non-primary DL carrier, the control information indicative of an assignment of the non-primary UL carrier paired with the non-primary DL carrier, wherein the assignment is based on a channel condition of the non-primary UL carrier. ### Claim 103 (depends on 102) The communication system of claim 102, wherein the channel condition includes an interference level associated with the non-primary UL carrier. ### Claim 104 (depends on 102) The communication system of claim 102, wherein the channel condition is associated with requirements of quality of service on the non-primary UL carrier. ### Claim 105 (depends on 102) The communication system of claim 102, wherein the control information indicative of the non-primary UL carrier is provided in a bit field or a bitmap. ### Claim 106 (depends on 102) The communication system of claim 102, wherein the control information indicative of the non-primary UL carrier is provided as an index or a control message. ### Claim 107 (depends on 101) The communication system of claim 101, wherein the UL signals include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. ### Claim 108 (depends on 101) The communication system of claim 101, wherein a bandwidth of the primary DL carrier is different than a bandwidth of the primary UL carrier. ### Claim 109 (depends on 101) The communication system of claim 101, wherein the first transmitter is further configured to transmit a first DL signal over the primary DL carrier and a second DL signal over the non-primary DL carrier at least in-part contemporaneously. ### Claim 110 (depends on 101) The communication system of claim 101, wherein at least one of the plurality of DL carriers is transmitted in a first cell and at least one of the one or more TDD carriers is transmitted in a second cell having a coverage area smaller than the first cell. ### Claim 111 (depends on 101) The communication system of claim 101, further comprising: a second receiver configured to receive a UL signal over the at least one of the one or more TDD carriers. ### Claim 112 (depends on 111) The communication system of claim 111, wherein the at least one of the one or more TDD carriers is located in a higher frequency band than a band in which at least one of the plurality of DL carriers are located. ### Claim 113 (depends on 112) The communication system of claim 112, wherein the first carrier of the plurality of carriers is one of the one or more TDD carriers. ### Claim 114 (depends on 113) The communication system of claim 113, wherein spatial multiplexing is applied to at least one of the plurality of DL carriers and beam forming is applied to the at least one of the one or more TDD carriers.