US20130336193A1 - Network information for assisting user equipment - Google Patents

Network information for assisting user equipment Download PDF

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Publication number
US20130336193A1
US20130336193A1 US13/920,036 US201313920036A US2013336193A1 US 20130336193 A1 US20130336193 A1 US 20130336193A1 US 201313920036 A US201313920036 A US 201313920036A US 2013336193 A1 US2013336193 A1 US 2013336193A1
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Prior art keywords
information
serving cell
information indicates
enb
previously used
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US13/920,036
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English (en)
Inventor
Tao Luo
Yongbin Wei
Peter Gaal
Hao Xu
Taesang Yoo
Siddhartha Mallik
Makesh Pravin JOHN WILSON
Naga Bhushan
Durga Prasad Malladi
Tingfang JI
Gavin Bernard Horn
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Qualcomm Inc
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Qualcomm Inc
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Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to US13/920,036 priority Critical patent/US20130336193A1/en
Priority to EP13732346.5A priority patent/EP2862401B1/en
Priority to HUE13732346A priority patent/HUE045520T2/hu
Priority to PCT/US2013/046278 priority patent/WO2013192160A1/en
Priority to ES13732346T priority patent/ES2762323T3/es
Priority to CN201380031742.4A priority patent/CN104380643B/zh
Priority to KR1020157001107A priority patent/KR102130633B1/ko
Priority to JP2015518512A priority patent/JP6266607B2/ja
Assigned to QUALCOMM INCORPORATED reassignment QUALCOMM INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HORN, GAVIN BERNARD, GAAL, PETER, BHUSHAN, NAGA, JI, TINGFANG, JOHN WILSON, MAKESH PRAVIN, LUO, TAO, MALLADI, DURGA PRASAD, MALLIK, SIDDHARTHA, WEI, YONGBIN, XU, HAO, YOO, TAESANG
Publication of US20130336193A1 publication Critical patent/US20130336193A1/en
Priority to US15/439,864 priority patent/US10771273B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
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    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
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    • H—ELECTRICITY
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
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    • H04L1/0075—Transmission of coding parameters to receiver
    • H—ELECTRICITY
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    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
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    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
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    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
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    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H—ELECTRICITY
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    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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
    • 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 signaling, 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • 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
    • H04L5/0091—Signaling for the administration of the divided path

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to network information for assisting a user equipment (UE).
  • UE user equipment
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power).
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP Third Generation Partnership Project
  • DL downlink
  • UL uplink
  • MIMO multiple-input multiple-output
  • the apparatus may be a UE that acquires information regarding an interfering non-serving cell and uses the information to improve decoding of serving cell signals.
  • the method includes receiving, from a serving evolved Node B (eNB), information that includes one or more transmission characteristics of at least one non-serving cell and performing at least one of interference cancellation, demodulation, or provides an improved channel quality indicator (CQI) based on the received information.
  • eNB serving evolved Node B
  • CQI channel quality indicator
  • FIG. 1 is a diagram illustrating an example of a network architecture.
  • FIG. 2 is a diagram illustrating an example of an access network.
  • FIG. 3 is a diagram illustrating an example of a DL frame structure in LTE.
  • FIG. 4 is a diagram illustrating an example of an UL frame structure in LTE.
  • FIG. 5 is a diagram illustrating an example of a radio protocol architecture for the user and control planes.
  • FIG. 6 is a diagram illustrating an example of an eNB and user equipment in an access network.
  • FIG. 7 is a diagram illustrating a range expanded cellular region in a heterogeneous network.
  • FIG. 8 is a flow chart of a method of wireless communication.
  • FIG. 9 is a conceptual data flow diagram illustrating the data flow between different modules/means/components in an exemplary apparatus.
  • FIG. 10 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • FIG. 1 is a diagram illustrating an LTE network architecture 100 .
  • the LTE network architecture 100 may be referred to as an Evolved Packet System (EPS) 100 .
  • the EPS 100 may include one or more UE 102 , an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) 104 , an Evolved Packet Core (EPC) 110 , a Home Subscriber Server (HSS) 120 , and an Operator's IP Services 122 .
  • the EPS can interconnect with other access networks, but for simplicity those entities/interfaces are not shown.
  • the EPS provides packet-switched services, however, as those skilled in the art will readily appreciate, the various concepts presented throughout this disclosure may be extended to networks providing circuit-switched services.
  • the E-UTRAN includes the eNB 106 and other eNBs 108 .
  • the eNB 106 provides user and control planes protocol terminations toward the UE 102 .
  • the eNB 106 may be connected to the other eNBs 108 via a backhaul (e.g., an X2 interface).
  • the eNB 106 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), or some other suitable terminology.
  • the eNB 106 provides an access point to the EPC 110 for a UE 102 .
  • Examples of UEs 102 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UE 102 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the eNB 106 is connected by an S1 interface to the EPC 110 .
  • the EPC 110 includes a Mobility Management Entity (MME) 112 , other MMEs 114 , a Serving Gateway 116 , and a Packet Data Network (PDN) Gateway 118 .
  • MME Mobility Management Entity
  • the MME 112 is the control node that processes the signaling between the UE 102 and the EPC 110 .
  • the MME 112 provides bearer and connection management. All user IP packets are transferred through the Serving Gateway 116 , which itself is connected to the PDN Gateway 118 .
  • the PDN Gateway 118 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 118 is connected to the Operator's IP Services 122 .
  • the Operator's IP Services 122 may include the Internet, the Intranet, an IP Multimedia Subsystem (IMS), and a PS Streaming Service (PSS).
  • IMS IP Multimedia Subsystem
  • PSS PS Streaming
  • FIG. 2 is a diagram illustrating an example of an access network 200 in an LTE network architecture.
  • the access network 200 is divided into a number of cellular regions (cells) 202 .
  • One or more lower power class eNBs 208 may have cellular regions 210 that overlap with one or more of the cells 202 .
  • the lower power class eNB 208 may be a femto cell (e.g., home eNB (HeNB)), pico cell, micro cell, or remote radio head (RRH).
  • HeNB home eNB
  • RRH remote radio head
  • the macro eNBs 204 are each assigned to a respective cell 202 and are configured to provide an access point to the EPC 110 for all the UEs 206 in the cells 202 .
  • the eNBs 204 are responsible for all radio related functions including radio bearer control, admission control, mobility control, scheduling, security, and connectivity to the serving gateway 116 .
  • the modulation and multiple access scheme employed by the access network 200 may vary depending on the particular telecommunications standard being deployed.
  • OFDM is used on the DL
  • SC-FDMA is used on the UL to support both frequency division duplexing (FDD) and time division duplexing (TDD).
  • FDD frequency division duplexing
  • TDD time division duplexing
  • FDD frequency division duplexing
  • TDD time division duplexing
  • EV-DO Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • EV-DO and UMB are air interface standards promulgated by the 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and employs CDMA to provide broadband Internet access to mobile stations. These concepts may also be extended to Universal Terrestrial Radio Access (UTRA) employing Wideband-CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA; Global System for Mobile Communications (GSM) employing TDMA; and Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM employing OFDMA.
  • UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from the 3GPP organization.
  • CDMA2000 and UMB are described in documents from the 3GPP2 organization. The actual wireless communication standard and the multiple access technology employed will depend on the specific application and the overall design constraints imposed on the system.
  • the eNBs 204 may have multiple antennas supporting MIMO technology.
  • MIMO technology enables the eNBs 204 to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity.
  • Spatial multiplexing may be used to transmit different streams of data simultaneously on the same frequency.
  • the data steams may be transmitted to a single UE 206 to increase the data rate or to multiple UEs 206 to increase the overall system capacity. This is achieved by spatially precoding each data stream (i.e., applying a scaling of an amplitude and a phase) and then transmitting each spatially precoded stream through multiple transmit antennas on the DL.
  • the spatially precoded data streams arrive at the UE(s) 206 with different spatial signatures, which enables each of the UE(s) 206 to recover the one or more data streams destined for that UE 206 .
  • each UE 206 transmits a spatially precoded data stream, which enables the eNB 204 to identify the source of each spatially precoded data stream.
  • Beamforming may be used to focus the transmission energy in one or more directions. This may be achieved by spatially precoding the data for transmission through multiple antennas. To achieve good coverage at the edges of the cell, a single stream beamforming transmission may be used in combination with transmit diversity.
  • OFDM is a spread-spectrum technique that modulates data over a number of subcarriers within an OFDM symbol.
  • the subcarriers are spaced apart at precise frequencies. The spacing provides “orthogonality” that enables a receiver to recover the data from the subcarriers.
  • a guard interval e.g., cyclic prefix
  • the UL may use SC-FDMA in the form of a DFT-spread OFDM signal to compensate for high peak-to-average power ratio (PAPR).
  • PAPR peak-to-average power ratio
  • FIG. 3 is a diagram 300 illustrating an example of a DL frame structure in LTE.
  • a frame (10 ms) may be divided into 10 equally sized sub-frames. Each sub-frame may include two consecutive time slots.
  • a resource grid may be used to represent two time slots, each time slot including a resource block.
  • the resource grid is divided into multiple resource elements.
  • a resource block contains 12 consecutive subcarriers in the frequency domain and, for a normal cyclic prefix in each OFDM symbol, 7 consecutive OFDM symbols in the time domain, or 84 resource elements.
  • For an extended cyclic prefix a resource block contains 6 consecutive OFDM symbols in the time domain and has 72 resource elements.
  • the DL-RS include Cell-specific RS (CRS) (also sometimes called common RS) 302 and UE-specific RS (UE-RS) 304 .
  • UE-RS 304 are transmitted only on the resource blocks upon which the corresponding physical DL shared channel (PDSCH) is mapped.
  • PDSCH physical DL shared channel
  • the number of bits carried by each resource element depends on the modulation scheme. Thus, the more resource blocks that a UE receives and the higher the modulation scheme, the higher the data rate for the UE.
  • FIG. 4 is a diagram 400 illustrating an example of an UL frame structure in LTE.
  • the available resource blocks for the UL may be partitioned into a data section and a control section.
  • the control section may be formed at the two edges of the system bandwidth and may have a configurable size.
  • the resource blocks in the control section may be assigned to UEs for transmission of control information.
  • the data section may include all resource blocks not included in the control section.
  • the UL frame structure results in the data section including contiguous subcarriers, which may allow a single UE to be assigned all of the contiguous subcarriers in the data section.
  • a UE may be assigned resource blocks 410 a , 410 b in the control section to transmit control information to an eNB.
  • the UE may also be assigned resource blocks 420 a , 420 b in the data section to transmit data to the eNB.
  • the UE may transmit control information in a physical UL control channel (PUCCH) on the assigned resource blocks in the control section.
  • the UE may transmit only data or both data and control information in a physical UL shared channel (PUSCH) on the assigned resource blocks in the data section.
  • a UL transmission may span both slots of a subframe and may hop across frequency.
  • a set of resource blocks may be used to perform initial system access and achieve UL synchronization in a physical random access channel (PRACH) 430 .
  • the PRACH 430 carries a random sequence and cannot carry any UL data/signaling.
  • Each random access preamble occupies a bandwidth corresponding to six consecutive resource blocks.
  • the starting frequency is specified by the network. That is, the transmission of the random access preamble is restricted to certain time and frequency resources. There is no frequency hopping for the PRACH.
  • the PRACH attempt is carried in a single subframe (1 ms) or in a sequence of few contiguous subframes and a UE can make only a single PRACH attempt per frame (10 ms).
  • FIG. 5 is a diagram 500 illustrating an example of a radio protocol architecture for the user and control planes in LTE.
  • the radio protocol architecture for the UE and the eNB is shown with three layers: Layer 1, Layer 2, and Layer 3.
  • Layer 1 (L1 layer) is the lowest layer and implements various physical layer signal processing functions.
  • the L1 layer will be referred to herein as the physical layer 506 .
  • Layer 2 (L2 layer) 508 is above the physical layer 506 and is responsible for the link between the UE and eNB over the physical layer 506 .
  • the L2 layer 508 includes a media access control (MAC) sublayer 510 , a radio link control (RLC) sublayer 512 , and a packet data convergence protocol (PDCP) 514 sublayer, which are terminated at the eNB on the network side.
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • the UE may have several upper layers above the L2 layer 508 including a network layer (e.g., IP layer) that is terminated at the PDN gateway 118 on the network side, and an application layer that is terminated at the other end of the connection (e.g., far end UE, server, etc.).
  • IP layer e.g., IP layer
  • the PDCP sublayer 514 provides multiplexing between different radio bearers and logical channels.
  • the PDCP sublayer 514 also provides header compression for upper layer data packets to reduce radio transmission overhead, security by ciphering the data packets, and handover support for UEs between eNBs.
  • the RLC sublayer 512 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the MAC sublayer 510 provides multiplexing between logical and transport channels.
  • the MAC sublayer 510 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell among the UEs.
  • the MAC sublayer 510 is also responsible for HARQ operations.
  • the radio protocol architecture for the UE and eNB is substantially the same for the physical layer 506 and the L2 layer 508 with the exception that there is no header compression function for the control plane.
  • the control plane also includes a radio resource control (RRC) sublayer 516 in Layer 3 (L3 layer).
  • RRC sublayer 516 is responsible for obtaining radio resources (i.e., radio bearers) and for configuring the lower layers using RRC signaling between the eNB and the UE.
  • FIG. 6 is a block diagram of an eNB 610 in communication with a UE 650 in an access network.
  • upper layer packets from the core network are provided to a controller/processor 675 .
  • the controller/processor 675 implements the functionality of the L2 layer.
  • the controller/processor 675 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocations to the UE 650 based on various priority metrics.
  • the controller/processor 675 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the UE 650 .
  • the transmit (TX) processor 616 implements various signal processing functions for the L1 layer (i.e., physical layer).
  • the signal processing functions includes coding and interleaving to facilitate forward error correction (FEC) at the UE 650 and mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)).
  • FEC forward error correction
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • Each stream is then mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 674 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 650 .
  • Each spatial stream is then provided to a different antenna 620 via a separate transmitter 618 TX.
  • Each transmitter 618 TX modulates an RF carrier with a respective spatial stream for transmission.
  • each receiver 654 RX receives a signal through its respective antenna 652 .
  • Each receiver 654 RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 656 .
  • the RX processor 656 implements various signal processing functions of the L1 layer.
  • the RX processor 656 performs spatial processing on the information to recover any spatial streams destined for the UE 650 . If multiple spatial streams are destined for the UE 650 , they may be combined by the RX processor 656 into a single OFDM symbol stream.
  • the RX processor 656 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal is recovered and demodulated by determining the most likely signal constellation points transmitted by the eNB 610 . These soft decisions may be based on channel estimates computed by the channel estimator 658 .
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the eNB 610 on the physical channel.
  • the data and control signals are then provided to the controller/processor 659 .
  • the controller/processor 659 implements the L2 layer.
  • the controller/processor can be associated with a memory 660 that stores program codes and data.
  • the memory 660 may be referred to as a computer-readable medium.
  • the controller/processor 659 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the core network.
  • the upper layer packets are then provided to a data sink 662 , which represents all the protocol layers above the L2 layer.
  • Various control signals may also be provided to the data sink 662 for L3 processing.
  • the controller/processor 659 is also responsible for error detection using an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support HARQ operations.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a data source 667 is used to provide upper layer packets to the controller/processor 659 .
  • the data source 667 represents all protocol layers above the L2 layer. Similar to the functionality described in connection with the DL transmission by the eNB 610 , the controller/processor 659 implements the L2 layer for the user plane and the control plane by providing header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations by the eNB 610 .
  • the controller/processor 659 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the eNB 610 .
  • Channel estimates derived by a channel estimator 658 from a reference signal or feedback transmitted by the eNB 610 may be used by the TX processor 668 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 668 are provided to different antenna 652 via separate transmitters 654 TX. Each transmitter 654 TX modulates an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the eNB 610 in a manner similar to that described in connection with the receiver function at the UE 650 .
  • Each receiver 618 RX receives a signal through its respective antenna 620 .
  • Each receiver 618 RX recovers information modulated onto an RF carrier and provides the information to a RX processor 670 .
  • the RX processor 670 may implement the L1 layer.
  • the controller/processor 675 implements the L2 layer.
  • the controller/processor 675 can be associated with a memory 676 that stores program codes and data.
  • the memory 676 may be referred to as a computer-readable medium.
  • the control/processor 675 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the UE 650 .
  • Upper layer packets from the controller/processor 675 may be provided to the core network.
  • the controller/processor 675 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • FIG. 7 is a diagram 700 illustrating a range expanded cellular region in a heterogeneous network.
  • a lower power class eNB 710 b may have a range expanded cellular region 703 that is expanded from the cellular region 702 via interference cancelation performed by the UE 720 .
  • the UE 720 may be handed off from the macro eNB 710 a to the lower power class eNB 710 b .
  • the lower power class eNB 710 b may be a femto cell (e.g., home eNB (HeNB)), pico cell, or a micro cell.
  • HeNB home eNB
  • the UE 702 is configured to receive information for enhancing the performance of the UE 702 in a heterogeneous network.
  • the received information may include interference characteristics, relay information, information related to a new carrier type (NCT) or machine type communication (MTC), information related to multi-user multiple-input multiple-output (MU-MIMO), information related to coordinated multi-point (CoMP), mobility information, multi-flow information, multicast broadcast single frequency network (MBSFN) and/or multimedia broadcast multicast service (MBMS) configuration information, rate matching information, and/or information related to positioning reference signals (PRS).
  • the UE 702 uses the received information to perform interference cancellation, demodulation, and/or provide an improved CQI. For example, if the UE 702 knows information related to PRS, the UE 702 may utilize the information related to PRS to detect the PRS without using a blind detector.
  • the interference characteristics may indicate a transmission mode (TM) of a node (e.g., an eNB) in a non-serving cell.
  • the transmission mode may be one of several transmission modes used for communication with a UE, such as “TM 1” indicating a single transmit antenna, “TM 2” indicating transmit diversity (i.e., space frequency block coding (SFBC) details for 2 antenna-ports), etc.
  • the interference characteristics may further indicate a carrier type and/or a carrier release used by the non-serving cell.
  • the carrier type may be a legacy carrier type (LCT) and/or an NCT.
  • the carrier release may indicate a specific LTE release, such as LTE Release 8/9/10/11/12 or later.
  • Such carrier release information may specify various information, such as the TM mode being used, channel state information reference signal (CSI-RS) information, enhanced physical downlink control channel (ePDCCH) information and other information corresponding to a specific release. For example, if the UE 702 knows the TM mode used by the eNB, the UE 702 may skip some hypotheses for unknown transmission modes.
  • CSI-RS channel state information reference signal
  • ePDCCH enhanced physical downlink control channel
  • the interference characteristics may further indicate a control span of an interferer (e.g., a number of OFDM symbols and/or a starting point of the PDSCH), typically used radio network temporary identifier (RNTI) values, an IC list, and a virtual cell identification (ID) set to narrow down the demodulation reference signal (DMRS) candidates.
  • an interferer e.g., a number of OFDM symbols and/or a starting point of the PDSCH
  • RNTI radio network temporary identifier
  • ID virtual cell identification
  • the DMRS candidates may be cell-specific.
  • the DMRS candidates may be UE-specific. For example, if the UE 702 knows the virtual cell ID set, the UE 702 may search only the candidates with respect to the virtual cell ID set rather than search all possible cell IDs.
  • the interference characteristics may further indicate statistics regarding a loading level of almost blank subframes (ABSs) and non-ABSs, statistics regarding previously used traffic-to-pilot ratios (TPRs) (e.g., a mean TPR), a previously used TPR, a TPR variation of 16-QAM or 64-QAM, statistics regarding a previously used modulation order (e.g., a percentage of QPSK or 16-QAM), and/or a previously used modulation order or loading.
  • TPRs traffic-to-pilot ratios
  • the statistics regarding the loading level of ABSs and non-ABSs may indicate a mean (e.g., based on the number of ABSs that are used and that are not used) and a variance.
  • the relay information may include loading information of a donor eNB, a resource allocation to a relay node, and/or a type of the donor eNB (e.g., a macro eNB or a pico eNB).
  • a UE may implement a distributed association algorithm, such that selection of a relay node is UE centric instead of network centric.
  • the UE may analyze various parameters for inferring the quality of a backhaul of the relay node, such as a parameter (e.g., “NumRX”) indicating the number of receive antennas of a relay node (more generally the UE category of the relay node), backhaul geometry of the relay node, and/or relay node loading.
  • a parameter e.g., “NumRX”
  • the relay node may be another UE.
  • the information related to NCT may indicate whether the transmissions from a node of a non-serving cell are based on the NCT or LCT.
  • TDM time division multiplexing
  • a TDM partition separating the NCT and LCT may be indicated to the UE to facilitate processing of the subframe.
  • the CRS is not present for all subframes (e.g., CRS may be present every five subframes). Therefore, if both the NCT and the LCT are used in neighboring cells, the UE may be informed of the presence of the NCT and may avoid performing CRS interference cancelation (CRS-IC) for all subframes.
  • CRS-IC CRS interference cancelation
  • the transmission mode for NCT has not been determined.
  • the DMRS pattern of the NCT may change to avoid collision with the primary synchronization signal (PSS) and the secondary synchronization signal (SSS).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the information related to MTC may indicate a narrow band region dedicated for MTC in order to allow the UE to apply different cancellation methods or processing.
  • the transmission from the narrow band is different from a PDSCH region of a subframe.
  • the information related to MU-MIMO may indicate information regarding other users, such as whether other users configured for MU-MIMO are currently transmitting in a non-serving cell.
  • the information related to CoMP may indicate a cooperation set associated with CoMP.
  • the cooperation set may indicate one or more nodes that are transmitting PDSCH to the UE.
  • the mobility information may include tunneled non-serving cell information used by a UE for performing a handover procedure.
  • the multi-flow information may indicate loading information of different nodes and different radio access technologies (RATs) of a multi-flow configuration.
  • RATs radio access technologies
  • the MBSFN and/or the MBMS configuration information may include the MBSFN and/or the MBMS configuration of a non-serving eNB in a neighboring cell.
  • the rate matching information may include rate matching information for the PDSCH of a non-serving eNB in a neighboring cell.
  • the PRS information may indicate the PRS implemented by a non-serving eNB in a neighboring cell.
  • FIG. 8 is a flow chart 800 of a method of wireless communication.
  • the method may be performed by a UE, such as UE 702 , in a heterogeneous netork.
  • the UE receives, from a serving eNB, information that includes one or more transmission characteristics of at least one non-serving cell.
  • the received information may include interference characteristics, relay information, information related to an NCT or MTC, information related to MU-MIMO, information related to CoMP, mobility information, multi-flow information, MBSFN and/or MBMS configuration information, rate matching information, and/or information related to PRS.
  • the UE receives one or more signals from the serving eNB.
  • the UE performs interference cancellation based on the received information. For example, the UE may use the interference characteristics of the at least one non-serving cell included in the received information to cancel an interference of the one or more signals from the serving eNB caused by signals from the at least one non-serving cell.
  • the UE performs demodulation based on the received information. For example, the UE may use the transmission characteristics (e.g., interference characteristics) of the at least one non-serving cell included in the received information to facilitate demodulation of the one or more signals from the serving eNB.
  • the transmission characteristics e.g., interference characteristics
  • the UE provides an improved CQI based on the received information. For example, the UE may use the transmission characteristics (e.g., interference characteristics) of the at least one non-serving cell included in the received information to accurately determine a CQI with respect to the serving eNB. The UE may transmit the determined CQI to the serving eNB.
  • the transmission characteristics e.g., interference characteristics
  • the path including steps 802 , 804 , and 806 , the path including steps 802 , 804 , and 808 , and the path including steps 802 , 804 , and 810 represent alternative mechanisms. It should be noted that any of the steps 806 , 808 , and 810 may be performed sequentially, in parallel, in various orders, and in various combinations.
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different modules/means/components in an exemplary apparatus 902 .
  • the apparatus may be a UE.
  • the apparatus includes a receiving module 904 that receives, from a serving eNB 950 , information that includes one or more transmission characteristics of at least one non-serving cell, an interference cancelling module 906 that performs interference cancellation using the received information, a demodulation module 908 that performs demodulation using the received information, a CQI module 910 that determines a CQI using the received information, and a transmission module 912 that transmits a CQI.
  • the apparatus may include additional modules that perform each of the steps of the algorithm in the aforementioned flow chart of FIG. 8 .
  • each step in the aforementioned flow chart of FIG. 8 may be performed by a module and the apparatus may include one or more of those modules.
  • the modules may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 10 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 902 ′ employing a processing system 1014 .
  • the processing system 1014 may be implemented with a bus architecture, represented generally by the bus 1024 .
  • the bus 1024 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints.
  • the bus 1024 links together various circuits including one or more processors and/or hardware modules, represented by the processor 1004 , the modules 904 , 906 , 908 , 910 , 912 and the computer-readable medium 1006 .
  • the bus 1024 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1014 may be coupled to a transceiver 1010 .
  • the transceiver 1010 is coupled to one or more antennas 1020 .
  • the transceiver 1010 provides a means for communicating with various other apparatus over a transmission medium.
  • the processing system 1014 includes a processor 1004 coupled to a computer-readable medium 1006 .
  • the processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium 1006 .
  • the software when executed by the processor 1004 , causes the processing system 1014 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium 1006 may also be used for storing data that is manipulated by the processor 1004 when executing software.
  • the processing system further includes at least one of the modules 904 , 906 , 908 , 910 , and 912 .
  • the modules may be software modules running in the processor 1004 , resident/stored in the computer readable medium 1006 , one or more hardware modules coupled to the processor 1004 , or some combination thereof.
  • the processing system 1014 may be a component of the UE 650 and may include the memory 660 and/or at least one of the TX processor 668 , the RX processor 656 , and the controller/processor 659 .
  • the apparatus 902 / 902 ′ for wireless communication includes means for receiving, from a serving eNB, information regarding at least one non-serving cell, and means for performing at least one of interference cancellation, demodulation, or providing an improved CQI based on the received information.
  • the aforementioned means may be one or more of the aforementioned modules of the apparatus 902 and/or the processing system 1014 of the apparatus 902 ′ configured to perform the functions recited by the aforementioned means.
  • the processing system 1014 may include the TX Processor 668 , the RX Processor 656 , and the controller/processor 659 .
  • the aforementioned means may be the TX Processor 668 , the RX Processor 656 , and the controller/processor 659 configured to perform the functions recited by the aforementioned means.

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PCT/US2013/046278 WO2013192160A1 (en) 2012-06-19 2013-06-18 Network information for assisting user equipment
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