Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
  • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
  • H04L27/20—Modulator circuits; Transmitter circuits
  • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
  • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
  • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
  • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
  • H04L5/0055—Physical resource allocation for ACK/NACK
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
  • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/02—Traffic management, e.g. flow control or congestion control
  • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/12—Wireless traffic scheduling
  • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
  • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/02—Terminal devices
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/08—Access point devices

Definitions

• This application relates to wireless communication systems, and more particularly to coupled mode common uplink bursts in Time Division Duplex (TDD) sub-frame structures.
• TDD Time Division Duplex
• a method for wireless communications includes receiving, at a user equipment (UE) from a base station (BS), a signal requesting the UE to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the UE and the BS, and transmitting, from the UE to the BS based upon the received signal, the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth.
• UE user equipment
• BS base station
• SRS sounding reference signal
• UL uplink
• an apparatus includes a receiver configured to receive, from another apparatus, a signal requesting the apparatus to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub- frame communicated between the apparatus and the other apparatus, and a transmitter configured to transmit, to the other apparatus based upon the received signal, the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth.
• SRS sounding reference signal
• UL uplink
• an apparatus includes means for receiving, from another apparatus, a signal requesting the apparatus to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the apparatus and the other apparatus, and means for transmitting, to the other apparatus based upon the received signal, the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth.
• SRS sounding reference signal
• UL uplink
• a computer-readable medium having program code recorded thereon includes program code comprising code for causing a user equipment (UE) to receive, from a base station (BS), a signal requesting the UE to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub- frame communicated between the UE and the BS, and code for causing the UE to transmit, to the BS based upon the received signal, the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth.
• UE user equipment
• BS base station
• SRS sounding reference signal
• UL uplink
• a method for wireless communications includes transmitting, from a base station (BS) to a user equipment (UE), a signal requesting the UE to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the UE and the BS, receiving, at the BS, the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth, and demodulating the received control channel based on the received SRS.
• BS base station
• UE user equipment
• SRS sounding reference signal
• UL uplink
• an apparatus includes a transmitter configured to transmit, to another apparatus, a signal requesting the other apparatus to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the other apparatus and the apparatus, a receiver configured to receive the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth, and a processor configured to demodulate the received control channel based on the received SRS.
• SRS sounding reference signal
• UL uplink
• an apparatus includes means for transmitting, to another apparatus, a signal requesting the other apparatus to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the other apparatus and the apparatus, means for receiving the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth, and means for demodulating the received control channel based on the received SRS.
• SRS sounding reference signal
• UL uplink
• a computer-readable medium having program code recorded thereon includes program code comprising code for causing a base station (BS) to transmit, to a user equipment (UE), a signal requesting the UE to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub- frame communicated between the UE and the BS, code for causing the BS to receive the common UL burst comprising the SRS and the control channel spanning the same frequency bandwidth, and code for causing the BS to demodulate the received control channel based on the received SRS.
• BS base station
• UE user equipment
• SRS sounding reference signal
• UL uplink
• FIG. 1 is a diagram of an exemplary wireless communications environment according to embodiments of the present disclosure.
• FIG. 2 is a block diagram of an exemplary user equipment (UE) according to embodiments of the present disclosure.
• UE user equipment
• FIG. 3 is a block diagram of an exemplary base station according to embodiments of the present disclosure.
• FIG. 4 is a diagram of a self-contained Time Division Duplex (TDD) sub-frame with a common uplink burst design according to embodiments of the present disclosure.
• TDD Time Division Duplex
• FIG. 5 is a diagram illustrating a structure of a common uplink burst in a coupled mode according to embodiments of the present disclosure.
• FIG. 6 is a flowchart illustrating an exemplary method for wireless communications that may be performed by a user equipment (UE) according to embodiments of the present disclosure.
• UE user equipment
• FIG. 7 is a flowchart illustrating an exemplary method for wireless communications that may be performed by a base station (BS) according to embodiments of the present disclosure.
• BS base station
• a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc.
• UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
• cdma2000 covers IS-2000, IS-95 and IS-856 standards.
• a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM).
• GSM Global System for Mobile Communications
• An OFDMA network may implement a radio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash- OFDMA, etc.
• E-UTRA Evolved UTRA
• UMB Ultra Mobile Broadband
• IEEE 802.11 Wi-Fi
• WiMAX IEEE 802.16
• Flash- OFDMA Flash- OFDMA
• UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
• 3 GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are new (e.g., 4G networks) releases of UMTS that use E-UTRA.
• UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP).
• CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
• 3GPP2 3rd Generation Partnership Project 2
• the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies, such as a next generation (e.g., 5 th Generation (5G)) network.
• 5G 5 th Generation
• FIG. 1 illustrates a wireless communication network 100 in accordance with various aspects of the present disclosure.
• the wireless network 100 may include a number of base stations 104 and a number of user equipment (UE) 106, all within one or more cells 102 as illustrated in FIG. 1.
• FIG. 1 shows base stations 104a, 104b, and 104c associated with cells 102a, 102b, and 102c, respectively.
• the communications environment 100 may support operation on multiple carriers (e.g., waveform signals of different frequencies).
• Multi-carrier transmitters can transmit modulated signals simultaneously on the multiple carriers.
• each modulated signal may be a multi-carrier channel modulated according to the various radio technologies described above.
• Each modulated signal may be sent on a different carrier and may carry control information (e.g., pilot signals, control channels, etc.), overhead information, data, etc.
• the communications environment 100 may be a multi-carrier LTE network capable of efficiently allocating network resources.
• the communications environment 100 is one example of a network to which various aspects of the disclosure apply.
• a base station (BS) 104 as discussed herein can have various characteristics. In some scenarios, it may include an evolved Node B (eNodeB or eNB) in the LTE context, for example.
• eNodeB evolved Node B
• a base station 104 may also be referred to as a base transceiver station or an access point. It will be recognized that there could be one to many base stations, as well as be an assortment of different types such as macro, pico, and/or femto base stations.
• the base stations 104 may communicate with each other and other network elements via one or more backhaul links.
• the base stations 104 communicate with the UEs 106 as shown, including via direct wireless connections or indirect, e.g., via relay devices.
• a UE 106 may communicate with a base station 104 via an uplink and a downlink.
• the downlink (or forward link) refers to the communication link from a base station 104 to a UE 106.
• the uplink (or reverse link) refers to the communication link from a UE 106 to a base station 104.
• the UEs 106 may be dispersed throughout the wireless network 100, and each UE 106 may be stationary or mobile.
• a UE may also be referred to as a terminal, a mobile station, a subscriber unit, etc.
• a UE 106 may be a cellular phone, a smartphone, a personal digital assistant, a wireless modem, a laptop computer, a tablet computer, entertainment device, medical device/equipment, biometric devices/equipment, fitness/exercise devices, vehicular components/sensors, etc.
• the wireless communication network 100 is one example of a network to which various aspects of the disclosure apply.
• FIG. 2 is a block diagram of UE 106 according to embodiments of the present disclosure.
• the UE 106 may include a processor 202, a memory 204, a transmission access resource selection module 208, a transceiver 210, and an antenna 216. These elements may be in direct or indirect communication with each other, for example via one or more buses.
• the processor 202 may include a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
• the processor 202 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
• the memory 204 may include a cache memory (e.g., a cache memory of the processor 442), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
• the memory 204 includes a non-transitory computer-readable medium.
• the memory 204 may store instructions 206.
• the instructions 206 may include instructions that, when executed by the processor 202, cause the processor 202 to perform the operations described herein with reference to the UE 106 in connection with embodiments of the present disclosure. Instructions 206 may also be referred to as code.
• the terms "instructions” and “code” may include any type of computer-readable statement(s). For example, the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc. "Instructions" and “code” may include a single computer-readable statement or many computer-readable statements.
• the transmission access resource selection module 208 may be configured to select and assign resources (e.g., time resources and/or frequency resources) for transmission of uplink bursts from UE 106, discussed in more detail below.
• the transceiver 210 may include a modem subsystem 212 and a radio frequency (RF) unit 214.
• the transceiver 210 is configured to communicate bi-directionally with other devices, such as base stations 104.
• the modem subsystem 212 may be configured to modulate and/or encode the data from the memory 204 and/or the transmission access resource selection module 208 (and/or from another source, such as some type of sensor) according to a modulation and coding scheme (MCS), e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, etc.
• MCS modulation and coding scheme
• LDPC low-density parity check
• the RF unit 214 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated/encoded data from the modem subsystem 212 (on outbound transmissions) or of transmissions originating from another source such as a base station 104. Although shown as integrated together in transceiver 210, the modem subsystem 212 and the RF unit 214 may be separate devices that are coupled together at the UE 106 to enable the UE 106 to communicate with other devices.
• process e.g., perform analog to digital conversion or digital to analog conversion, etc.
• the RF unit 214 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages which may contain one or more data packets and other information), to the antenna 216 for transmission to one or more other devices. This may include, for example, transmission of data to a base station 104 according to embodiments of the present disclosure.
• the antenna 216 may further receive data messages transmitted from a base station 104 and provide the received data messages for processing and/or demodulation at the transceiver 210.
• FIG. 2 illustrates antenna 216 as a single antenna, antenna 216 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
• FIG. 3 is a block diagram of an exemplary base station 104 according to embodiments of the present disclosure.
• the base station 104 may include a processor 302, a memory 304, a resource coordination module 308, a transceiver 310, and an antenna 316. These elements may be in direct or indirect communication with each other, for example via one or more buses.
• the base station 104 may be an evolved Node B (eNodeB or eNB), a macro cell, a pico cell, a femto cell, a relay station, an access point, or another electronic device operable to perform the operations described herein with respect to the base station 104.
• eNodeB or eNB evolved Node B
• a macro cell a pico cell, a femto cell, a relay station, an access point, or another electronic device operable to perform the operations described herein with respect to the base station 104.
• the base station 104 may operate in accordance with one or more communication standards, such as a 3rd generation (3G) wireless communication standard, a 4th generation (4G) wireless communication standard, a long term evolution (LTE) wireless communication standard, an LTE-advanced wireless communication standard, or another wireless communication standard now known or later developed (e.g., a next generation network operating according to a 5G protocol).
• 3G 3rd generation
• 4G 4th generation
• LTE long term evolution
• LTE-advanced wireless communication standard an LTE-advanced wireless communication standard
• another wireless communication standard now known or later developed (e.g., a next generation network operating according to a 5G protocol).
• the processor 302 may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein with reference to the base station 104 introduced in FIG. 1 above.
• the processor 302 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
• the memory 304 may include a cache memory (e.g., a cache memory of the processor 302), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
• the memory 304 includes a non-transitory computer-readable medium.
• the memory 304 may store instructions 306.
• the instructions 306 may include instructions that, when executed by the processor 302, cause the processor 302 to perform the operations described herein with reference to the base station 104 in connection with embodiments of the present disclosure.
• Instructions 306 may also be referred to as code, which may be interpreted broadly to include any type of computer- readable statement(s) as discussed above with respect to FIG. 2.
• the resource coordination module 308 may be configured to coordinate resource usage (e.g., time resources and/or frequency resources) among the base stations 104 when communicating with the UEs 106, such as to mitigate or at least reduce interference among the base stations 104.
• the transceiver 310 may include a modem subsystem 312 and a radio frequency (RF) unit 314.
• the transceiver 310 is configured to communicate bi-directionally with other devices, such as UEs 106.
• the modem subsystem 312 may be configured to modulate and/or encode data according to a MCS, some examples of which have been listed above with respect to FIG. 2.
• the RF unit 314 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) of modulated/encoded data from the modem subsystem 312 (on outbound transmissions) or of transmissions originating from another source, such as an UE 106.
• the modem subsystem 312 and the RF unit 314 may be separate devices that are coupled together at the base station 104 to enable the base station 104 to communicate with other devices.
• the RF unit 314 may provide the modulated and/or processed data, e.g. data packets, to the antenna 316 for transmission to one or more other devices such as UEs 106.
• the modem subsystem 312 may modulate and/or encode the data in preparation for transmission.
• the RF unit 314 may receive the modulated and/or encoded data packet and process the data packet prior to passing it on to the antenna 316. This may include, for example, transmission of data messages to UEs 106 or to another base station 104, according to embodiments of the present disclosure.
• the antenna 316 may further receive data messages transmitted from UEs 106, and provide the received data messages for processing and/or demodulation at the transceiver 310.
• FIG. 3 illustrates antenna 316 as a single antenna, antenna 316 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
• FIG. 4 is a self-contained Time Division Duplex (TDD) sub-frame structure 400 with a common uplink burst design according to embodiments of the present disclosure.
• the TDD sub-frame structure 400 may comprise a plurality of downlink (DL) centric sub-frames 402 and at least one uplink (UL) centric sub-frame 404 for each communication cycle 406 between eNB (e.g., eNB 104) and UE (e.g., UE 106).
• eNB e.g., eNB 104
• UE e.g., UE 106
• a number of DL centric sub-frames 402 per communication cycle 406 can be greater than a number of UL centric sub-frames 404.
• the ratio can be fixed or variable.
• the number of UL centric sub-frames 404 is greater than the number of DL centric sub-frames 402.
• Each DL centric sub-frame 402 may comprise a Physical Downlink Control Channel (PDCCH) 408, a Physical Downlink Shared Channel (PDSCH) 410, and a common UL burst 412.
• Each UL centric sub-frame 404 may comprise a PDCCH 414, a regular UL burst 416, and a common UL burst 418.
• each DL centric sub-frame 402 and UL centric sub-frame 404 of the TDD sub-frame structure 400 may be communicated during a transmission time interval (TTI) with duration of 0.25 ms (e.g., short sub-frame structure).
• TTI transmission time interval
• each common UL burst structure (e.g., the common UL burst 412, and the common UL burst 418) may comprise, for example, two short orthogonal frequency division multiplexing (OFDM) symbols having duration of approximately 33 (e.g., for sub-carrier spacing of 60 kHz). It is understood that the frame structure and associated lengths of time of TTIs, PDSCHs, DL bursts, UL bursts, and/or common UL bursts may vary.
• OFDM orthogonal frequency division multiplexing
• Certain embodiments of the present disclosure relate to decoupling uplink control latency from the DL/UL switch pattern. This may be achieved by transmitting control channel information in either a DL centric sub-frame 402 or in an UL centric sub-frame 404.
• the control channel information transmitted from UE to eNB may comprise at least one of: a Physical layer (PHY) Acknowledgement (ACK), a Negative Acknowledgement (NACK), or a Scheduling Request (SR).
• PHY Physical layer
• NACK Negative Acknowledgement
• SR Scheduling Request
• UE may transmit PHY ACK/NACK to acknowledge (or negatively acknowledge) reception of DL data
• SR may represent a request for eNB to provide UL grant so that UE can transmit Physical Uplink Shared Channel (PUSCH).
• PUSCH Physical Uplink Shared Channel
• control channel information may be transmitted from UE to eNB within common UL bursts (e.g., the common UL burst 412 of the DL centric sub-frame 402, and/or the common UL burst 418 of the UL centric sub-frame 404).
• a Sounding Reference Signal (SRS) with an optional Buffer Status Report (BSR) may be transmitted from the UE to the eNB within the same common UL bursts.
• SRS Sounding Reference Signal
• BSR Buffer Status Report
• the SRS is a reference signal transmitted by the UE in the UL direction that can be used by the eNB to estimate UL channel quality over a wider bandwidth
• the BSR provides a serving eNB with information about an amount of data available for transmission in UL buffers of the UE.
• the UE may be also configured to transmit UL payload data having low latency requirement, if the UE has power headroom greater than a defined threshold.
• the UE may transmit low latency UL payload data within common UL bursts of DL centric sub-frames and/or UL centric sub-frames.
• FIG. 5 is a structure 500 illustrating a common UL burst in a coupled SRS mode according to embodiments of the present disclosure.
• a common UL burst 502 e.g., common UL burst 412 of DL centric sub-frame 402 in FIG. 4 and/or common UL burst 418 of UL centric sub-frame 404 in FIG. 4
• the symbols 504 and 506 may be OFDM symbols.
• FIG. 5 is a structure 500 illustrating a common UL burst in a coupled SRS mode according to embodiments of the present disclosure.
• a common UL burst 502 e.g., common UL burst 412 of DL centric sub-frame 402 in FIG. 4 and/or common UL burst 418 of UL centric sub-frame 404 in FIG.
• the symbols 504 and 506 may be OFDM symbols.
• the symbol 504 may comprise SRS
• the symbol 506 may include control channel information that may comprise at least one of ACK, NACK, SR, or BSR.
• both SRS and control channel information transmitted within the same common UL burst may utilize the same frequency span (e.g., the frequency span of 80 MHz, as illustrated in FIG. 5).
• coupled transmission of SRS and control channel information within a common UL burst may be optimized for link budget limited users that only transmit one (spatial) stream.
• wide-band SRS may be used as a Demodulation Reference Signal (DM-RS) for control channel information (e.g., ACK/NACK/SR/BSR).
• DM-RS Demodulation Reference Signal
• eNB When eNB receives a common UL burst comprising coupled SRS and control channel information, eNB having a previous knowledge of SRS may utilize the received SRS to sound a channel between UE and eNB, which may be then used for demodulation of the received control channel information (e.g., ACK/NACK/SR/BSR).
• control channel information e.g., ACK/NACK/SR/BSR
• control channel information may span the same frequency band (e.g., the frequency band of 80 MHz, as illustrated in FIG. 5) as SRS transmitted coupled with the control channel information within the same common UL burst.
• the energy for transmitting SRS along with control channel information (e.g., ACK/NACK/SR/BSR) within a common UL burst may be leveraged for ACK/NACK/SR/BSR demodulation without transmission of separate DM-RS.
• transmission of SRS and ACK/NACK/SR/BSR spanning the same frequency band may increase frequency diversity.
• the SRS and ACK/NACK/SR/BSR may be transmitted within a common UL burst using the same beamforming at UE.
• common UL burst 502 in FIG. 5 may comprise two-symbol UL burst at the end of each DL centric sub-frame and/or UL centric sub-frame.
• TDM Time Division Multiplexing
• Certain embodiments of the present disclosure utilize single carrier waveforms for transmission of both SRS and control channel information (e.g., ACK/NACK/SR/BSR), when SRS and control channel information (e.g., Physical Uplink Control Channel (PUCCH)) are transmitted in the coupled mode, i.e., within the same common UL burst.
• SRS and PUCCH e.g., ACK/NACK/SR/BSR
• SRS and PUCCH may both use single carrier waveforms to achieve high efficiency of power amplifier(s) at UE.
• SRS may be spread before transmission by applying Zadoff-chu sequence or pseudo-random sequence with Gaussian minimum shift keying (GMSK) modulation.
• GMSK Gaussian minimum shift keying
• PUCCH may utilize, for example, Discrete Fourier Transform (DFT)-spread OFDM waveform or GMSK waveforms.
• DFT Discrete Fourier Transform
• a shared SRS/PUCCH region may be employed across a plurality of users.
• Each user of the plurality of users can then be differentiated at eNB based on a different and unique sequence (in code domain).
• each spreading sequence that is unique for each user of the plurality of users may be allocated by a network.
• Certain embodiments of the present disclosure utilize data-aided channel estimation at eNB to enhance SRS estimation quality.
• SRS and PUCCH may be power-controlled to achieve desirable Signal-plus- Interference-to-Noise Ratio (SINR) at eNB.
• SINR Signal-plus- Interference-to-Noise Ratio
• typical operating point of PUCCH may provide a block error rate (BLER) of less than 1%.
• a signal may be transmitted from a base station to a UE controlling (requesting) the UE to send SRS in the coupled mode (i.e., to send SRS coupled with control channel information in a common UL burst).
• a signal may be then transmitted from the UE indicating that the UE transmits SRS in the coupled mode.
• the base station may utilize the signal transmitted from UE to refine estimation of SRS.
• the UE may transmit a signal (i.e., change indicator) indicating to the base station that a direction (e.g., beamforming direction) of SRS transmission has changed since a last instance (e.g., since a last SRS transmission). In this way, the UE informs the base station not to filter SRS with a last sub- frame, i.e., not to filter the received SRS using a direction (e.g., beamforming direction) associated with a previously transmitted SRS.
• a direction e.g., beamforming direction
• FIG. 6 is a flowchart illustrating an exemplary method 600 for coupled mode common UL burst communication according to embodiments of the present disclosure.
• the method 600 may be implemented in UE 106.
• the method 600 will be described with respect to a single UE 106 for simplicity of discussion, though it will be recognized that the aspects described herein may be applicable to a plurality of UEs 106, including a network of UEs. It is understood that additional method blocks can be provided before, during, and after the blocks of method 600, and that some of the blocks described can be replaced or eliminated for other embodiments of the method 600.
• a UE may receive from a base station a signal (e.g., coupled SRS indicator) requesting the UE to transmit a SRS and a control channel (e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR) within a common UL burst (e.g., common UL burst 412 from FIG. 4, common UL burst 418 from FIG. 4, common UL burst 502 from FIG. 5) in each sub-frame (e.g., DL centric sub-frame 402 from FIG. 4, UL centric sub-frame 404 from FIG. 4) communicated between the UE and the base station.
• a signal e.g., coupled SRS indicator
• a control channel e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR
• the UE may transmit to the base station, based upon the received signal (e.g., coupled SRS indicator), the common UL burst (e.g., common UL burst 502 from FIG. 5) comprising the SRS and the control channel spanning the same frequency bandwidth.
• the received signal e.g., coupled SRS indicator
• the common UL burst e.g., common UL burst 502 from FIG. 5
• FIG. 7 is a flowchart illustrating an exemplary method 700 for coupled mode common UL burst communication according to embodiments of the present disclosure.
• the method 700 may be implemented in the base station 104.
• the method 700 will be described with respect to a single base station 104 in communication with a single UE 106 for simplicity of discussion, though it will be recognized that the aspects described herein may be applicable to a plurality of UEs 106 and/or base stations 104. It is understood that additional method blocks can be provided before, during, and after the blocks of method 700, and that some of the blocks described can be replaced or eliminated for other embodiments of the method 700.
• a base station may transmit to UE a signal (e.g., coupled SRS indicator) requesting the UE to transmit a SRS and a control channel (e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR) within a common UL burst (e.g., common UL burst 412 from FIG. 4, common UL burst 418 from FIG. 4, common UL burst 502 from FIG. 5) in each sub-frame (e.g., DL centric sub-frame 402 from FIG. 4, UL centric sub-frame 404 from FIG. 4) communicated between the UE and the base station.
• a signal e.g., coupled SRS indicator
• a control channel e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR
• the base station may receive the common UL burst (e.g., common UL burst 502 from FIG. 5) comprising the SRS and the control channel spanning the same frequency bandwidth.
• the base station may demodulate the received control channel (e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR) based on the received SRS.
• the received control channel e.g., PUCCH comprising at least one of ACK, NACK, SR, or BSR
• Information and signals may be represented using any of a variety of different technologies and techniques.
• data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
• a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
• a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).
• the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

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• 2016
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