HK1181599B - Method and apparatus for inferring user equipment interference suppression capability from measurements report - Google Patents

Description

Method and apparatus for inferring user equipment interference suppression capability from measurement reports

Cross Reference to Related Applications

This application claims benefit of U.S. provisional application No.61/323,766 entitled "method and apparatus for inducing ue interference supression capability from measurement report" filed on 13/4/2010, which provisional application is hereby expressly incorporated herein in its entirety by reference.

Technical Field

The present disclosure relates generally to communication systems, and more particularly to inferring user equipment interference suppression capabilities from Radio Resource Management (RRM) reports.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access techniques 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.

These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a city, country, region, or even global level. An example of an emerging telecommunications standard is Long Term Evolution (LTE). LTE is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the third generation partnership project (3 GPP). It is designed to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, using new spectrum, and better merging with other open standards (using OFDMA on the Downlink (DL), SC-FDMA on the Uplink (UL), and multiple-input multiple-output (MIMO) antenna technology). However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in LTE technology. Preferably, these improvements should be applicable to other multiple access techniques and telecommunications standards employing these techniques.

Disclosure of Invention

A User Equipment (UE) capable of cancelling interference from cell-specific interfering signals (CRS), Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), or Physical Control Format Indicator Channel (PCFICH) may perform interference cancellation without explicitly signaling this capability to a serving evolved node b (enb). The serving eNB may send a plurality of cell identifiers to the UE to indicate that cell interference from it should be cancelled. The UE receives CRS, PDSCH, PDCCH, or PCFICH from the serving eNB and cancels CRS, PDSCH, PDCCH, or PCFICH interference, respectively, from the signal received from the eNB. The UE cancels interference from the cell corresponding to the cell identifier. The UE may then send a report to the eNB including quality measurements without interference.

In one aspect of the disclosure, a method, an apparatus, and a computer program product for wireless communication are provided in which at least one cell identifier is received. Each cell identifier corresponds to a cell from which interference should be cancelled. In addition, interference received from cells corresponding to one or more of the at least one cell identifier is removed from the received signal. Further, a report is sent, the report including a quality measurement of the received signal without the interference.

In one aspect of the disclosure, a method, an apparatus, and a computer program product for wireless communication are provided in which at least one cell identifier is transmitted to a user equipment. Each cell identifier is associated with a cell from which interference should be cancelled. Additionally, a signal is transmitted to the user equipment. Further, a report is received, the report including a quality measurement of the transmitted signal without the interference.

In one aspect of the disclosure, a method, an apparatus, and a computer program product for wireless communication are provided in which information is received. The information includes: a radio network temporary identifier for each wireless network from which at least one of a physical downlink control channel or a physical control format indicator channel is received, a control channel element aggregation level, and a relative power ratio between resource elements for the at least one of a physical downlink control channel or a physical control format indicator channel and resource elements for reference signals. In addition, interference is cancelled based on the information.

Drawings

Fig. 1 is a diagram illustrating an example of a hardware implementation of an apparatus using a processing system.

Fig. 2 is a diagram illustrating an example of a network architecture.

Fig. 3 is a diagram illustrating an example of an access network.

Fig. 4 is a diagram showing an example of a frame structure used in an access network.

Fig. 5 shows an exemplary format for UL in LTE.

Fig. 6 is a diagram illustrating an example of a radio protocol architecture for the user plane and the control plane.

Fig. 7 is a diagram illustrating an example of an evolved node B and user equipment in an access network.

Fig. 8 is a diagram illustrating an exemplary method.

Fig. 9 is a flow chart of a first method of wireless communication.

Fig. 10 is a flow chart of a second method of wireless communication.

Fig. 11 is a flow chart of a third method of wireless communication.

Fig. 12 is a flow chart of a fourth method of wireless communication.

Fig. 13 is a conceptual block diagram illustrating the functions of the first exemplary apparatus.

Fig. 14 is a flow chart of a fifth method of wireless communication.

Fig. 15 is a conceptual block diagram illustrating the functions of the second exemplary apparatus.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein can be implemented. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. It will be apparent, however, to one skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Various aspects of a telecommunications system will now be presented in the context of various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

For example, an element, or any portion of an element, or any combination of elements may be implemented with a "processing system" that includes one or more processors. Examples of 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 functions described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to refer to instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, processes, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. The software may reside on a computer readable medium. The computer readable medium may be a non-transitory computer readable medium. By way of example, a non-transitory computer-readable medium may include a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., Compact Disc (CD), Digital Versatile Disc (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), Random Access Memory (RAM), Read Only Memory (ROM), programmable ROM (prom), erasable prom (eprom), electrically erasable prom (eeprom), a register, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer. The computer readable medium may be internal to the processing system, external to the processing system, or distributed across multiple entities including the processing system. The computer readable medium may be embodied in a computer program product. By way of example, a computer program product may include a computer-readable medium in packaging material. Those skilled in the art will recognize how best to implement the functions described throughout this disclosure depending on the particular application and the overall design constraints imposed on the overall system.

Thus, in one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored or encoded as one or more instructions or code on a computer-readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, 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, as used herein, 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 conceptual diagram illustrating an example of a hardware implementation of an apparatus 100 using a processing system 114. In this example, the processing system 114 may be implemented with a bus architecture, represented generally by the bus 102. The bus 102 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 114 and the overall design constraints. The bus 102 links together various circuits including one or more processors (represented generally by the processor 104) and computer-readable media (represented generally by the computer-readable media 106). The bus 102 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. Bus interface 108 provides an interface between bus 102 and transceiver 110. The transceiver 110 provides a means for communicating with various other apparatus over a transmission medium. Depending on the nature of the device, a user interface 112 (e.g., keypad, display, speaker, microphone, joystick) may also be provided.

The processor 104 is responsible for managing the bus 102 and general processing, including the execution of software stored on the computer-readable medium 106. The software, when executed by the processor 104, causes the processing system 114 to perform the various functions described below for any particular apparatus. The computer-readable medium 106 may also be used for storing data that is manipulated by the processor 104 when executing software.

Fig. 2 is a diagram illustrating an LTE network architecture 200 using various apparatuses 100 (see fig. 1). The LTE network architecture 200 may be referred to as an Evolved Packet System (EPS) 200. The EPS200 may include: one or more User Equipments (UEs) 202, evolved UMTS terrestrial radio Access network (E-UTRAN) 204, Evolved Packet Core (EPC) 210, Home Subscriber Server (HSS) 220, and operator's IP services 222. The EPS can interconnect with other access networks, but for simplicity those entities/interfaces are not shown. As 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 evolved node Bs (eNBs) 206 and other eNBs 208. eNB206 provides user and control plane protocol terminations toward UE 202. eNB206 may connect to other enbs 208 via a wired or wireless interface, which may be an X2 interface (i.e., backhaul) or wireless transmission. The eNB206 may also be referred to by those skilled in the art as a base station, a base station transceiver, 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. eNB206 provides an access point for UE202 to EPC 210. Examples of UEs 202 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. The UE202 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 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.

eNB206 connects to EPC210 through a wired interface, which may include an S1 interface. EPC210 may include: a Mobility Management Entity (MME) 212, other MMEs 214, a serving gateway 216, and a Packet Data Network (PDN) gateway 218. MME212 is a control node that handles signaling between UE202 and EPC 210. Generally, MME212 provides bearer and connection management. All user IP packets are transported through the serving gateway 216, which serving gateway 216 itself is connected to the PDN gateway 218. The PDN gateway 218 provides ue ip address allocation as well as other functions. The PDN gateway 218 connects to the operator's IP service 222. The operator's IP services 222 may include, for example: internet, intranet, IP Multimedia Subsystem (IMS), and PS streaming service (PSs), or access thereto.

Fig. 3 is a diagram illustrating an example of an access network in an LTE network architecture. In this example, the access network 300 is divided into a plurality of cellular regions (cells) 302. One or more lower power class enbs 308, 312 may have cellular regions 310, 314, respectively, that overlap with one or more of cells 302. The lower power level enbs 308, 312 may be femto cells (e.g., home enbs (henbs)), pico cells, micro cells, or repeaters. A higher power class or macro eNB304 is allocated to the cell 302 and is configured to provide an access point to the EPC210 to some or all UEs in the cell 302. There is no centralized controller in this example of the access network 300, but a centralized controller may be used in alternative configurations. The eNB304 performs radio-related functions including radio bearer control, admission control, mobility control, scheduling, security, and connectivity to the serving gateway 216 (see fig. 2).

The modulation and multiple access schemes used by the access network 300 may vary based on the particular telecommunications standard being deployed. In LTE applications, OFDM is used on the DL and SC-FDMA is used on the UL to support both Frequency Division Duplex (FDD) and Time Division Duplex (TDD). As will be readily apparent to those skilled in the art from the following detailed description, the various concepts presented herein are well suited for LTE applications. However, these concepts can be readily extended to other telecommunications standards using other modulation and multiple access techniques. For example, these concepts may be extended to evolution data optimized (EV-DO) or Ultra Mobile Broadband (UMB). EV-DO and UMB are air interface standards promulgated by the third generation partnership project 2 (3 GPP 2) as part of the CDMA2000 family of standards and use CDMA to provide broadband internet access to mobile stations. These concepts can also be extended to Universal Terrestrial Radio Access (UTRA) using wideband CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA, etc.; global system for mobile communications (GSM) using TDMA; and evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802.20, and flash-OFDM using 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 multiple access technique used will depend on the particular application and the overall design constraints imposed on the system.

eNB304 may have multiple antennas supporting MIMO technology. The use of MIMO technology enables the eNB304 to utilize the spatial domain to support spatial multiplexing, beamforming, and transmit diversity.

Spatial multiplexing may be used to transmit different data streams simultaneously on the same frequency. The data stream may be transmitted to a single UE306 to increase the data rate, or to multiple UEs 306 to increase the overall system capacity. This may be achieved by spatially precoding each data stream (i.e., applying a scaling of amplitude and phase) and then transmitting each spatially precoded stream over multiple transmit antennas on the downlink. The spatially precoded data streams with different spatial signatures arrive at the UE306, which enables each of the UEs 306 to recover one or more data streams destined for that UE 306. On the uplink, each UE306 transmits a spatially precoded data stream, which enables the eNB304 to identify the source of each spatially precoded data stream.

Spatial multiplexing is typically used when channel conditions are good. When channel conditions are unfavorable, beamforming may be used to concentrate the transmission energy in one or more directions. This may be achieved by spatially precoding the data for transmission over multiple antennas. To achieve good coverage at the cell edge, single stream beamformed transmission may be used in conjunction with transmit diversity.

In the detailed description that follows, various aspects of an access network will be described with reference to a MIMO system supporting OFDM on the downlink. OFDM is a spread spectrum technique that modulates data over multiple subcarriers within an OFDM symbol. The subcarriers are spaced apart at precise frequencies. This spacing provides "orthogonality" that enables the receiver to recover the data from the subcarriers. In the time domain, a guard interval (e.g., a cyclic prefix) may be added to each OFDM symbol to combat inter-OFDM symbol interference. The uplink may use SC-FDMA in the form of DFT-spread OFDM signal to compensate for high peak-to-average power ratio (PAPR).

Various frame structures may be used to support DL and UL transmissions. An example of a DL frame structure will now be given with reference to fig. 4. However, as those skilled in the art will readily appreciate, the frame structure for any particular application may vary depending on a number of factors. In this example, a frame (10 ms) is divided into 10 equally sized sub-frames. Each subframe includes two consecutive slots.

The resource grid may be used to represent two slots, each slot including a Resource Block (RB). The resource grid is divided into a plurality of resource elements. In LTE, a resource block contains 12 consecutive subcarriers in the frequency domain, 7 consecutive OFDM symbols in the time domain (for a normal cyclic prefix in each OFDM symbol), or 84 resource elements. Some of the resource elements (as indicated as R402, 404) include DL reference signals (DL-RS). The DL-RS includes CRS (also sometimes referred to as common RS) 402 and UE-specific RS (UE-RS) 404. The UE-RS404 is transmitted only on the resource blocks to which the corresponding PDSCH is mapped. The number of bits carried by each resource element depends on the modulation scheme. Thus, the more resource blocks the UE receives and the higher the modulation scheme, the higher the data rate of the UE.

An example of a UL frame structure 500 will now be given with reference to fig. 5. Fig. 5 shows an exemplary format for UL in LTE. The available resource blocks of the UL may be divided into a data portion and a control portion. The control portion may be formed at both edges of the system bandwidth and may have a configurable size. The resource blocks in the control portion may be allocated to the UE for transmission of control information. The data portion may include some or all of the resource blocks not included in the control portion. The design in fig. 5 is such that the data portion includes contiguous subcarriers, which may allow all of the contiguous subcarriers in the data portion to be allocated to a single UE.

The resource blocks 510a, 510b in the control section may be allocated to the UE to transmit control information to the eNB. Resource blocks 520a, 520b in the data portion may also be allocated to the UE for transmitting data to the eNodeB. The UE may transmit control information in a Physical Uplink Control Channel (PUCCH) on the allocated resource blocks in the control portion. The UE may transmit only data or both data and control information in a Physical Uplink Shared Channel (PUSCH) on the allocated resource blocks in the data portion. As shown in fig. 5, the UL transmission may span two slots of a subframe and may hop across frequency.

As shown in fig. 5, a set of resource blocks may be used to perform initial system access and achieve UL synchronization in a Physical Random Access Channel (PRACH) 530. The PRACH530 carries a random sequence and cannot carry any UL data/signaling. Each random access preamble occupies a bandwidth corresponding to 6 consecutive resource blocks. The starting frequency is specified by the network. That is, the transmission of the random access preamble is limited to only a specific time and frequency resource. There is no frequency hopping for PRACH. The PRACH attempt is carried in a single subframe (1 ms), and the UE can only make a single PRACH attempt per frame (10 ms).

The wireless protocol architecture may take various forms depending on the particular application. An example system will now be given with reference to fig. 6. Fig. 6 is a conceptual diagram illustrating an example of a radio protocol architecture for the user and control planes.

In fig. 6, the radio protocol architecture for the UE and eNB is shown with 3 layers: layer 1, layer 2 and layer 3. Layer 1 is the lowest layer and implements various physical layer signal processing functions. Layer 1 is referred to herein as physical layer 606. Layer 2 (L2 layer) 608 is above the physical layer 606 and is responsible for the linkage between the UE and the eNB over the physical layer 606.

In the user plane, the L2 layer 608 includes a Medium Access Control (MAC) sublayer 610, a Radio Link Control (RLC) sublayer 612, and a Packet Data Convergence Protocol (PDCP) sublayer 614, which terminate at the eNB on the network side. Although not shown, the UE may have several upper layers above the L2 layer 608, including a network layer (e.g., IP layer) that terminates at the PDN gateway 208 (see fig. 2) on the network side, and an application layer that terminates at the other end of the connection (e.g., remote UE, server, etc.).

The PDCP sublayer 614 provides multiplexing between different radio bearers and logical channels, and may also include header compression of 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 612 includes the following functions: 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). The MAC sublayer 610 provides multiplexing between logical channels and transport channels, and may also include allocating various radio resources (e.g., resource blocks) in one cell between UEs, and managing HARQ operations.

In the control plane, the radio protocol architecture for the UE and eNB is substantially the same as the radio protocol architecture for the physical layer 606 and the L2 layer 608, except that there is no header compression function for the control plane. The control plane also includes a Radio Resource Control (RRC) sublayer 616 in layer 3. The RRC sublayer 616 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the eNB and the UE.

Fig. 7 is a block diagram of an eNB710 in communication with a UE750 in an access network. In the DL, upper layer packets from the core network are provided to the controller/processor 775. The controller/processor 775 performs the functions of the L2 layer previously described in connection with fig. 6. In the DL, the controller/processor 775 provides the following functions, including: header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the UE750 based on various priority metrics, HARQ operations, retransmission of lost packets, and signaling to the UE 750.

TX processor 716 performs various signal processing functions for the L1 layer (i.e., the physical layer). The signal processing functions include coding and interleaving to facilitate Forward Error Correction (FEC) at the UE750, 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)). The coded and modulated symbols are then split into parallel streams. Each stream is then mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) 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 a plurality of spatial streams. Channel estimates from channel estimator 774 may be used to determine the coding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals and/or channel condition feedback transmitted by UE 750. Each spatial stream is then provided to a different antenna 720 via a separate transmitter 718 TX. Each transmitter 718TX modulates an RF carrier with a respective spatial stream for transmission.

At the UE750, each receiver 754RX receives a signal through its respective antenna 752. Each receiver 754RX recovers information modulated onto an RF carrier and provides the information to a Receiver (RX) processor 756.

RX processor 756 performs various signal processing functions at the L1 layer. RX processor 756 performs spatial processing on the information to recover any spatial streams directed to UE 750. If multiple spatial streams are directed to UE750, the spatial streams may be combined into a single OFDM symbol stream by RX processor 756. The RX processor 756 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). 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 are recovered and demodulated by determining the most likely signal constellation points transmitted by the eNB 710. These soft decisions may be based on channel estimates computed by the channel estimator 758. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the eNB710 on the physical channel. The data and control signals are then provided to a controller/processor 759.

The controller/processor 759 implements the L2 layer previously described in connection with fig. 6. In the UL, the controller/processor 759 provides the following functions, including: 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 packet is then provided to a data sink 762, which data sink 762 represents all protocol layers above the L2 layer. Various control signals may also be provided to a data sink 762 for processing by L3. The controller/processor 759 is also responsible for error detection using an Acknowledgement (ACK) and/or Negative Acknowledgement (NACK) protocol to support HARQ operations.

In the UL, a data source 767 is used to provide upper layer packets to the controller/processor 759. The data source 767 represents all protocol layers above the L2 layer (L2). Similar to the functionality described in connection with the DL transmission by the eNB710, the controller/processor 759 implements the L2 layer for the user and control planes by providing header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocation by the eNB 710. The controller/processor 759 is also responsible for HARQ operations, retransmission of lost packets, and transmission of signaling to the eNB 710.

Channel estimates, derived by a channel estimator 758 from reference signals or feedback transmitted by eNB710, may be used by TX processor 768 to select appropriate coding and modulation schemes, as well as to facilitate spatial processing. The spatial streams generated by the TX processor 768 are provided to different antennas 752 via separate transmitters 754 TX. Each transmitter 754TX modulates an RF carrier with a respective spatial stream for transmission.

UL transmissions are processed at eNB710 in a manner similar to that described in connection with receiver functionality at UE 750. Each receiver 718RX receives a signal through its respective antenna 720. Each receiver 718RX recovers information modulated onto an RF carrier and provides the information to an RX processor 770. RX processor 770 implements the L1 layer.

The controller/processor 759 implements the L2 layer previously described in connection with fig. 6. In the UL, the controller/processor 759 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the UE 750. Upper layer packets from the controller/processor 775 may be provided to the core network. The controller/processor 759 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

In one configuration, the processing system 114 described with respect to fig. 1 includes an eNB 710. In particular, the processing system 114 includes a TX processor 716, an RX processor 770, and a controller/processor 775. In another configuration, the processing system 114 described with respect to fig. 1 includes the UE 750. In particular, the processing system 114 includes a TX processor 768, an RX processor 756, and a controller/processor 759. According to an example method, without explicit signaling, the eNB determines whether the UE is able to cancel interference from the transmitted CRS, PDSCH, PDCCH, or PCFICH based on RRM reports transmitted by the UE. When the UE is unable to cancel interference, the UE sends an RRM report including quality measurements without interference cancellation. When the UE is able to cancel interference, the UE sends an RRM report including the interference-canceled quality measurement. According to an example method, the eNB can infer the interference suppression capability of the UE based on the RRM report. The exemplary method is further described with respect to fig. 8.

Fig. 8 is a diagram 800 illustrating an exemplary methodology relating to interference automatic cancellation by a UE without explicitly signaling the capability to a serving eNB. As shown in fig. 8, a UE806 served by an eNB802 can suppress CRS, PDSCH, PDCCH, and/or PCFICH interference. UE806 receives configuration information that provides at least one cell identifier from a cell identifier list 808 of cells. UE806 may then attempt to cancel interference corresponding to the cells in cell identifier list 808. For example, assuming the cell identifier of the neighbor eNB804 is in the cell identifier list 808, the UE806 attempts to detect the eNB 804. The UE806 may detect the eNB804 by using the synchronization signal from the eNB 804. In the LTE example, the UE806 may use a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS) transmitted from the eNB 804. If the synchronization signal received from the eNB804 is a weak signal, the UE806 may cancel interference caused by a stronger synchronization signal received from a stronger cell in order to detect the eNB 804. In the LTE example, the UE806 may receive the PSS/SSS from the eNB804 and cancel the interfering PSS/SSS from the eNB820 in order to detect the PSS/SSS from the eNB 804. If the UE806 is unable to detect the eNB804 through the PSS/SSS transmitted by the eNB804, the UE806 may detect the eNB804 based on a Positioning Reference Signal (PRS) from the eNB 804.

Alternatively, the UE806 may detect the eNB804 through a broadcast channel transmitted by the eNB804 (e.g., in LTE, a Physical Broadcast Channel (PBCH) is used). In such a configuration, if the PBCH received from the eNB804 is a weak signal, the UE806 may cancel interference from a stronger PBCH received from another cell in order to detect the eNB 804. For example, UE806 may receive PBCH from eNB804 and cancel the interfering PBCH received from eNB 820.

In another alternative, rather than detecting eNB804 based on the PBCH sent directly from eNB804, UE806 may detect eNB804 based on the PBCH received by eNB 802. In such a configuration, eNB802 may receive the PBCH corresponding to eNB804 through the tunneling scheme, whereby eNB802 transmits the PBCH of eNB804 to UE 806.

After the UE806 detects the eNB804, the UE may cancel the interference caused by the signal 812 from the signal 810. The signals 810, 812 may be CRS, PDSCH, PDCCH, or PCFICH. UE806 may receive configuration information identifying the type of signal on which to perform interference cancellation. For example, UE806 may be configured to suppress interference of received CRS without suppressing interference of received PDSCH, PDCCH, or PCFICH. The UE determines Received Signal Received Power (RSRP) of signal 810 (814). UE806 may also determine a Received Signal Received Quality (RSRQ) of signal 810 after canceling interference from signal 812 from signal 810 (814). The RSRQ measurements may correspond to signals received in resources on which UE806 is configured to communicate. The RSRQ measurements may correspond to signals received in resources (such as all DL resources and/or multiple sets of resources) on which the UE806 is not configured to communicate. RSRQ is equal to the Received Signal Received Power (RSRP) divided by the Received Signal Strength Indicator (RSSI). Interference cancellation affects the RSSI values. After determining the RSRQ, the UE806 sends an RRM report 816, the RRM report 816 including the RSRQ of the received signal 810 without the interference 812. The UE also sends RSRP of received signal 810 and RSRQ of interfering signal 812. UE806 may also send RRM report 818, RRM report 818 including RSRQ of signal 810 with interference 812.

As discussed previously, the signals 810, 812 may be PDCCH or PCFICH. The signal PDCCH/PCFICH may be used for scheduling paging information, system information, or other information. If the signals 810, 812 are PDCCH or PCFICH, the eNB802 will send at least one of the following to the UE 806: a Radio Network Temporary Identifier (RNTI), a Control Channel Element (CCE) aggregation level, and a relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for reference signals for each radio network from which the PDCCH/PCFICH is received. Based on the received information, UE806 may cancel interference caused by signal 812 from received signal 810. If the interference is caused by individual data, the interference can be suppressed by spatial techniques.

The eNB802 may receive the RRM report 816. Based on the RRM report 816, the eNB802 determines whether the UE806 is able to cancel the interference 812 and determines whether to serve the UE806 (822). For example, the eNB802 may compare the RSRP of the signal 810 to the RSRP of the interfering signal 812. When the RSRP of interfering signal 812 from neighbor eNB804 is greater than the RSRP of signal 810 from serving eNB802 and the RSRP of signal 810 is greater than 0, eNB802 can infer that UE806 can cancel interfering signal 812 from signal 810. If the UE806 is able to cancel the interference 812, the eNB802 may determine to continue serving the UE806 even if the UE806 is at the cell edge 824. Thus, when eNB802 determines that UE806 can suppress CRS, PDSCH, PDCCH, and/or PCFICH interference, eNB802 can serve UE806 when UE806 is far away from eNB 802.

Fig. 9 is a flow diagram 900 of a first method involving automatic interference cancellation by a UE without explicitly signaling capabilities to a serving eNB. The method is performed by a UE (e.g., UE 806). According to the method, a UE receives configuration information identifying a first set of resources for transmission (902). The UE may also receive configuration information indicating that the UE is to provide quality measurements on a second set of resources on which the UE is not transmitting (904). The second set of resources may include some or all DL resources and/or multiple sets of resources. If the UE is to suppress PDCCH/PCFICH interference, the UE also receives configuration information including RNTI for each radio network from which PDCCH/PCFICH interference is to be suppressed (906). The configuration information may include a CCE aggregation level and a relative power ratio between REs for PDCCH/PCFICH and REs for reference signals. The UE receives at least one cell identifier from a serving eNB (908). Each cell identifier corresponds to a cell from which interference should be cancelled. The UE removes interference received from cells corresponding to one or more of the at least one cell identifier from the received signal (910). The UE then transmits a report that includes the quality measurement of the received signal without interference (912). The quality measurement corresponds to a signal received on a first set of resources and is for a signal received on a second set of resources if the UE is configured to provide the quality measurement on the second set of resources (912).

Fig. 10 is a flow diagram 1000 of a second method involving automatic interference cancellation by a UE without explicitly signaling capabilities to a serving eNB. The method is performed by a UE (e.g., UE 806). According to the method, a UE receives at least one cell identifier (1002). Each cell identifier corresponds to a cell from which interference should be cancelled. The UE cancels or suppresses interference in the received signal from cells corresponding to one or more of the at least one cell identifier (1004). The UE then sends a report including the quality measurements of the received signal without the interference (1006). The UE also transmits a second report including the quality measurement of the received signal with interference (1008).

Fig. 11 is a flow chart 1100 of a third method of wireless communication. The method is performed by a UE (e.g., UE 806). According to the method, a UE receives at least one cell identifier (1102). Each cell identifier corresponds to a cell from which interference should be cancelled. The UE detects a cell corresponding to one of the at least one cell identifier. The detection may be performed by the received PSS/SSS, PRS, or PBCH (1104). The UE then cancels or suppresses interference in the received signal from the detected cells corresponding to one or more of the at least one cell identifier (1106). The UE then transmits a report that includes the quality measurements of the received signal without interference (1108).

In one configuration, the UE receives at least one synchronization signal (e.g., PSS or SSS) from a cell corresponding to one of the at least one cell identifier. In addition, the UE may cancel interference caused by an additionally received synchronization signal. When the cell cannot be detected using the synchronization signaling, the UE may detect a cell corresponding to one of the at least one cell identifier based on the PRS. In an alternative configuration, the UE receives the PBCH from a cell corresponding to one of the at least one cell identifier. In addition, the UE may cancel or suppress interference caused by the additionally received PBCH in order to detect the cell. In a further configuration, the UE may detect a cell corresponding to one of the at least one cell identifier based on PBCH of neighbor cells received from the serving cell.

Fig. 12 is a flow chart 1200 of a fourth method of wireless communication. The method is performed by a UE (e.g., UE 806). According to the method, the UE receives information that may include at least one of: an RNTI, a CCE aggregation level, a relative power ratio between REs for at least one of PDCCH or PCFICH and REs for reference signals from each radio network in which the at least one of PDCCH or PCFICH is received (1202). The UE receives interference from at least one of the each wireless network from which at least one of the PDCCH or PCFICH is received (1204). The UE cancels interference in the received signal (i.e., the PDCCH and/or PCFICH signal received from the serving eNB) based on the information (1206).

Fig. 13 is a conceptual block diagram 1300 illustrating the functionality of the first exemplary apparatus 100. The apparatus 100 (which may be a UE) comprises: a module 1302 detects an interfering cell. The cell detection module 1302 detects a cell associated with a cell identifier provided by the eNB. The signal cancellation module 1304 receives a signal from a serving eNB. The signal from the serving eNB includes interference from one or more neighbor cells. The signal cancellation module 1304 cancels, removes, or otherwise suppresses interference from neighbor cells detected by the cell detection module 1302. The signal interference module 1304 may receive configuration information to enable interference suppression. For example, when the received signal is one of PDCCH or PCFICH, the signal cancellation module 1304 may receive information including: an RNTI, a CCE aggregation level, a relative power ratio between REs for at least one of PDCCH or PCFICH and REs for a reference signal from each radio network in which the at least one of PDCCH or PCFICH is received. The signal measurement module 1306 receives the modified received signal and provides a quality measurement. The quality measurements are for a set of resources configured based on the received configuration information. The apparatus 100 may include additional modules that perform each of the steps of the aforementioned flow diagrams 9-12. Thus, each of the foregoing flow diagrams 9-12 may be performed by a module, and the apparatus 100 may include one or more such modules.

Fig. 14 is a flow chart 1400 of a fifth method of wireless communication. The method is performed by an eNB (e.g., eNB 802). According to the method, the eNB configures the UE to communicate over a first set of resources (1402). The eNB sends the at least one cell identifier to the UE (1404). Each cell identifier is associated with a cell from which interference should be cancelled. The eNB sends a signal to the UE (1406). The signal may be at least one of CRS, PDSCH, PDCCH, or PCFICH. The eNB receives a report including quality measurements of the transmitted signals (1408). The quality measure may correspond to a signal transmitted in the first set of resources. The eNB then determines whether the UE is able to cancel interference based on the received report (1410). The eNB may then determine whether to serve the UE based on whether the UE is able to cancel interference (1412).

The quality measurement may be an RSRQ measurement and the report may be an RRM report. The eNB may configure the UE to provide quality measurements on the second set of resources without configuring the UE to communicate over the second set of resources. In such a configuration, the quality measurement is also for signals transmitted in the second set of resources. When the interference is at least one of PDCCH or PCFICH, the eNB may further send the following information to the UE, including: an RNTI for each radio network from which PDCCH/PCFICH is received by the UE, a CCE aggregation level, a relative power ratio between REs for PDCCH/PCFICH and REs for reference signals. The eNB may also receive a second report including a quality measurement of the transmitted signal with the interference.

Fig. 15 is a conceptual block diagram 1500 illustrating the functionality of the third exemplary apparatus 100. The apparatus 100 (which may be an eNB) includes a neighbor cell identifier module 1502, the neighbor cell identifier module 1502 receives a neighbor eNB list and identifies cells from which the UE should cancel interference. The cell identifier associated with the identified cell is provided to the Tx/Rx module 1508, and the Tx/Rx module 1508 provides the cell identifier to the UE 1510. The Tx/Rx module 1508 receives measurement reports from the UE 1510. The measurement report analyzer 1504 receives the measurement report and determines, based on the measurement report, whether the UE1510 is capable of cancelling, removing, or otherwise suppressing interference from the identified cell. The UE serving module 1506 determines whether to serve the UE1510 based on whether the UE1510 is able to cancel the interference.

Referring to fig. 1-7, in one configuration, an apparatus 100 for wireless communication includes means for receiving at least one cell identifier. Each cell identifier corresponds to a cell from which interference should be cancelled. The apparatus 100 further includes means for removing interference from received signals received from cells corresponding to one or more of the at least one cell identifier. The apparatus 100 also includes means for transmitting a report including a quality measurement of the received signal without interference. The apparatus 100 also includes means for receiving configuration information. The configuration information identifies a first set of resources for quality measurement and communication. The apparatus 100 may also include means for receiving second configuration information. The second configuration information identifies a second set of resources for quality measurement. In one configuration, the interference is at least one of PDCCH or PCFICH; the apparatus 100 further comprises means for receiving information comprising: an RNTI, a CCE aggregation level, a relative power ratio between REs for PDCCH/PCFICH and REs for reference signals, of each radio network from which PDCCH/PCFICH is received; and removing interference from the received signal based on the received information. The apparatus 100 may also include means for transmitting a second report including the quality measurement of the received signal with the interference. The apparatus 100 may further comprise: means for receiving at least one synchronization signal from a cell corresponding to one of the at least one cell identifier; means for removing interference of a further received synchronization signal from the received at least one synchronization signal; and means for detecting a cell based on the at least one synchronization signal not having interference corresponding to an additionally received synchronization signal. The apparatus 100 may also include means for detecting a cell corresponding to one of the at least one cell identifier based on the PRS. The apparatus 100 may further comprise: means for receiving PBCH from a cell corresponding to one of the at least one cell identifier; means for removing interference of a further received PBCH from the received PBCH; and means for detecting the cell based on the PBCH without interference of an additionally received PBCH. The apparatus 100 may also include means for detecting a cell corresponding to one of the at least one cell identifier based on PBCH of neighbor cells received from a serving cell. The modules are processing systems 114 configured to perform the functions described by the modules. As described supra, the processing system 114 includes the TX processor 768, the RX processor 756, and the controller/processor 759. Thus, in one configuration, the modules may be the TX processor 768, the RX processor 756, and the controller/processor 759 configured to perform the functions recited by the modules.

In one configuration, an apparatus 100 for wireless communication includes means for transmitting at least one cell identifier to a UE. Each cell identifier corresponds to a cell from which interference should be cancelled. The apparatus 100 also includes means for transmitting a signal to the UE. The apparatus 100 also includes means for receiving a report including a quality measurement of the transmitted signal. The apparatus 100 also includes means for determining whether the UE is capable of cancelling interference based on whether the quality measurement of the transmitted signal corresponds to a transmitted signal without interference. The apparatus 100 may also include means for determining whether to serve the UE based on whether the UE is capable of cancelling interference. The apparatus 100 also includes means for configuring the UE to communicate over the first set of resources. In such a configuration, the quality measurement is for a signal transmitted on the first set of resources. The apparatus 100 may also include means for configuring the UE to provide quality measurements on the second set of resources without configuring the UE to communicate on the second set of resources. In such a configuration, the quality measurement is also for signals transmitted on the second set of resources. In one configuration, the interference is at least one of PDCCH or PCFICH, and apparatus 100 further comprises means for transmitting information comprising: an RNTI for each radio network from which PDCCH/PCFICH is received by the UE, a CCE aggregation level, and a relative power ratio between REs for PDCCH/PCFICH and REs for reference signals. The apparatus 100 may also include means for receiving a second report including a quality measurement of the transmitted signal with the interference. The modules are processing systems 114 configured to perform the functions described by the modules. As described supra, the processing system 114 includes the TX processor 716, the RX processor 770, and the controller/processor 775. Thus, in one configuration, the modules may be the TX processor 716, the RX processor 770, and the controller/processor 775 configured to perform the functions recited by the modules.

In one configuration, an apparatus 100 for wireless communication includes means for receiving information comprising: an RNTI, a CCE aggregation level, and a relative power ratio between REs for at least one of PDCCH or PCFICH and REs for reference signals from each radio network in which the at least one of PDCCH or PCFICH is received. The apparatus 100 also includes means for canceling interference based on the information. The modules are processing systems 114 configured to perform the functions described by the modules. As described supra, the processing system 114 includes the TX processor 768, the RX processor 756, and the controller/processor 759. Thus, in one configuration, the modules may be the TX processor 768, the RX processor 756, and the controller/processor 759 configured to perform the functions recited by the modules.

It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. It should be understood that the specific order or hierarchy of steps in the processes may be rearranged based on design preferences. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the written claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more. The term "some" means one or more unless specifically stated otherwise. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

Claims (51)

1. A method of wireless communication, comprising:

receiving, by a User Equipment (UE), at least one cell identifier, each cell identifier corresponding to a cell from which interference should be cancelled, wherein the interference comprises at least one of a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH);

receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) of each radio network from which the PDCCH/PCFICH is received;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

removing interference received from a cell corresponding to one or more of the at least one cell identifier from a received signal, wherein the interference is removed from the received signal in accordance with the received information; and

sending a report including a quality measurement of the received signal without the interference.

2. The method of claim 1, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

3. The method of claim 1, further comprising:

receiving configuration information identifying a first set of resources for quality measurement and communication;

wherein the quality measure corresponds to a measure of the first set of resources in the received signal.

4. The method of claim 3, further comprising:

receiving second configuration information identifying a second set of resources for quality measurement;

wherein the report further comprises a second quality measurement corresponding to the second set of resources in the received signal.

5. The method of claim 4, wherein the second set of resources is not configured for communication.

6. The method of claim 1, further comprising:

transmitting a second report comprising a quality measurement of the received signal with the interference.

7. The method of claim 1, further comprising:

receiving at least one synchronization signal from a cell corresponding to one of the at least one cell identifier;

removing interference corresponding to the additionally received synchronization signal from the received at least one synchronization signal; and

detecting the cell based on the at least one synchronization signal not having interference corresponding to the additionally received synchronization signal.

8. The method of claim 1, further comprising:

detecting a cell corresponding to one of the at least one cell identifier based on a Positioning Reference Signal (PRS).

9. The method of claim 1, further comprising:

receiving a Physical Broadcast Channel (PBCH) from a cell corresponding to one of the at least one cell identifier;

removing interference of an additionally received PBCH from the received PBCH in order to detect the cell; and

detecting the cell based on the PBCH without interference of the additionally received PBCH.

10. The method of claim 1, further comprising:

detecting a cell corresponding to one of the at least one cell identifier based on a Physical Broadcast Channel (PBCH) of a neighbor cell received from a serving cell.

11. A method of wireless communication, comprising:

transmitting, to a User Equipment (UE), at least one cell identifier, each cell identifier corresponding to a cell whose transmitted signal is identified for interference cancellation, wherein the interference comprises at least one of a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH);

transmitting a signal to the UE;

transmitting information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) for each radio network from which the PDCCH/PCFICH is received by the UE;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

receiving a report comprising a quality measurement of the transmitted signal; and

determining whether the UE is capable of cancelling interference based on whether the quality measurement of the transmitted signal corresponds to a transmitted signal without interference.

12. The method of claim 11, further comprising:

determining whether to serve the UE based on whether the UE is capable of cancelling the interference.

13. The method of claim 11, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

14. The method of claim 11, further comprising:

configuring the UE to communicate over a first set of resources, wherein the quality measurements correspond to signals transmitted in the first set of resources.

15. The method of claim 14, further comprising:

configuring the UE to provide quality measurements for a second set of resources over which the UE is not configured to communicate, and wherein the quality measurements also correspond to signals transmitted over the second set of resources.

16. The method of claim 11, further comprising:

receiving a second report comprising a quality measurement of the transmitted signal with the interference.

17. A method of wireless communication, comprising:

receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI), a Control Channel Element (CCE) aggregation level, a relative power ratio between Resource Elements (REs) for at least one of a Physical Downlink Control Channel (PDCCH) or a Physical Control Format Indicator Channel (PCFICH) and REs for reference signals from each radio network in which the at least one of the PDCCH or the PCFICH is received;

receiving interference from at least one of the each wireless network from which at least one of the PDCCH or the PCFICH is received; and

canceling the interference in the received signal based on the information.

18. An apparatus for wireless communication, comprising:

means for receiving at least one cell identifier, each cell identifier corresponding to a cell from which interference should be cancelled, wherein the interference comprises at least one of a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH);

means for receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) of each radio network from which the PDCCH/PCFICH is received;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

means for removing interference from a received signal received from a cell corresponding to one or more of the at least one cell identifier, wherein the interference is removed from the received signal based on the received information; and

means for sending a report including a quality measurement of the received signal without the interference.

19. The apparatus of claim 18, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

20. The apparatus of claim 18, further comprising:

means for receiving configuration information identifying a first set of resources for quality measurement and communication;

wherein the quality measure corresponds to a measure of the first set of resources in the received signal.

21. The apparatus of claim 20, further comprising:

means for receiving second configuration information identifying a second set of resources for quality measurement;

wherein the report further comprises a second quality measurement corresponding to the second set of resources in the received signal.

22. The apparatus of claim 21, wherein the second set of resources is not configured for communication.

23. The apparatus of claim 18, further comprising:

means for transmitting a second report comprising a quality measurement of the received signal with the interference.

24. The apparatus of claim 18, further comprising:

means for receiving at least one synchronization signal from a cell corresponding to one of the at least one cell identifier;

means for removing interference corresponding to a further received synchronization signal from the received at least one synchronization signal; and

means for detecting the cell based on at least one synchronization signal that does not have interference corresponding to the additionally received synchronization signal.

25. The apparatus of claim 18, further comprising:

means for detecting a cell corresponding to one of the at least one cell identifier based on a Positioning Reference Signal (PRS).

26. The apparatus of claim 18, further comprising:

means for receiving a Physical Broadcast Channel (PBCH) from a cell corresponding to one of the at least one cell identifier;

means for removing interference of an otherwise received PBCH from the received PBCH for detecting the cell; and

means for detecting the cell based on PBCH without interference of the additionally received PBCH.

27. The apparatus of claim 18, further comprising:

means for detecting a cell corresponding to one of the at least one cell identifier based on a Physical Broadcast Channel (PBCH) of a neighbor cell received from a serving cell.

28. An apparatus for wireless communication, comprising:

means for transmitting at least one cell identifier to a User Equipment (UE), each cell identifier corresponding to a cell whose transmitted signal is identified for interference cancellation;

means for transmitting a signal to the UE;

means for transmitting information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) for each radio network from which the PDCCH/PCFICH is received by the UE;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

means for receiving a report comprising a quality measurement of the transmitted signal; and

means for determining whether the UE is capable of cancelling interference based on whether the quality measurement of the transmitted signal corresponds to a transmitted signal without interference.

29. The apparatus of claim 28, further comprising:

means for determining whether to serve the UE based on whether the UE is capable of cancelling the interference.

30. The apparatus of claim 28, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

31. The apparatus of claim 28, further comprising:

means for configuring the UE to communicate over a first set of resources, wherein the quality measurements correspond to signals transmitted in the first set of resources.

32. The apparatus of claim 31, further comprising:

means for configuring the UE to provide quality measurements for a second set of resources over which the UE is not configured to communicate, and wherein the quality measurements also correspond to signals transmitted over the second set of resources.

33. The apparatus of claim 28, further comprising:

means for receiving a second report comprising a quality measurement of the transmitted signal with the interference.

34. An apparatus for wireless communication, comprising:

means for receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI), a Control Channel Element (CCE) aggregation level, a relative power ratio between Resource Elements (REs) for at least one of a Physical Downlink Control Channel (PDCCH) or a Physical Control Format Indicator Channel (PCFICH) and REs for reference signals from each radio network in which the at least one of the PDCCH or the PCFICH is received;

means for receiving interference from at least one of the each wireless network from which at least one of the PDCCH or the PCFICH is received; and

means for canceling the interference in a received signal based on the information.

35. An apparatus for wireless communication, comprising:

a processing system configured to:

receiving at least one cell identifier, each cell identifier corresponding to a cell from which interference should be cancelled, wherein the interference comprises at least one of a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH);

receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) of each radio network from which the PDCCH/PCFICH is received;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

removing interference received from a cell corresponding to one or more of the at least one cell identifier from a received signal, wherein the interference is removed from the received signal in accordance with the received information; and

sending a report including a quality measurement of the received signal without the interference.

36. The apparatus of claim 35, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

37. The apparatus of claim 35, wherein the processing system is further configured to:

receiving configuration information identifying a first set of resources for quality measurement and communication;

wherein the quality measure corresponds to a measure of the first set of resources in the received signal.

38. The apparatus of claim 37, wherein the processing system is further configured to:

receiving second configuration information identifying a second set of resources for quality measurement;

wherein the report further comprises a second quality measurement corresponding to the second set of resources in the received signal.

39. The apparatus of claim 38, wherein the second set of resources is not configured for communication.

40. The apparatus of claim 35, wherein the processing system is further configured to:

transmitting a second report comprising a quality measurement of the received signal with the interference.

41. The apparatus of claim 35, wherein the processing system is further configured to:

receiving at least one synchronization signal from a cell corresponding to one of the at least one cell identifier;

removing interference corresponding to the additionally received synchronization signal from the received at least one synchronization signal; and

detecting the cell based on at least one synchronization signal that does not have interference corresponding to the additionally received synchronization signal.

42. The apparatus of claim 35, wherein the processing system is further configured to:

detecting a cell corresponding to one of the at least one cell identifier based on a Positioning Reference Signal (PRS).

43. The apparatus of claim 35, wherein the processing system is further configured to:

receiving a Physical Broadcast Channel (PBCH) from a cell corresponding to one of the at least one cell identifier;

removing interference of an additionally received PBCH from the received PBCH in order to detect the cell; and

detecting the cell based on PBCH without interference of the additionally received PBCH.

44. The apparatus of claim 35, wherein the processing system is further configured to:

detecting a cell corresponding to one of the at least one cell identifier based on a Physical Broadcast Channel (PBCH) of a neighbor cell received from a serving cell.

45. An apparatus for wireless communication, comprising:

a processing system configured to:

transmitting at least one cell identifier to a User Equipment (UE), each cell identifier corresponding to a cell whose transmitted signal is identified for interference cancellation;

transmitting a signal to the UE;

transmitting information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI) of each radio network from which a Physical Downlink Control Channel (PDCCH)/Physical Control Format Indicator Channel (PCFICH) is received by the UE;

a Control Channel Element (CCE) aggregation level; or

A relative power ratio between Resource Elements (REs) for the PDCCH/PCFICH and REs for a reference signal;

receiving a report comprising a quality measurement of the transmitted signal; and

determining whether the UE is capable of cancelling interference based on whether the quality measurement of the transmitted signal corresponds to a transmitted signal without interference.

46. The apparatus of claim 45, wherein the processing system is further configured to:

determining whether to serve the UE based on whether the UE is capable of cancelling the interference.

47. The apparatus of claim 45, wherein the quality measurement is a Received Signal Received Quality (RSRQ) measurement and the report is a Radio Resource Management (RRM) report.

48. The apparatus of claim 45, wherein the processing system is further configured to:

configuring the UE to communicate over a first set of resources, wherein the quality measurements correspond to signals transmitted in the first set of resources.

49. The apparatus of claim 48, wherein the processing system is further configured to:

configuring the UE to provide quality measurements for a second set of resources over which the UE is not configured to communicate, and wherein the quality measurements also correspond to signals transmitted over the second set of resources.

50. The apparatus of claim 45, wherein the processing system is further configured to:

receiving a second report comprising a quality measurement of the transmitted signal with the interference.

51. An apparatus for wireless communication, comprising:

a processing system configured to:

receiving information, the information comprising at least one of:

a Radio Network Temporary Identifier (RNTI), a Control Channel Element (CCE) aggregation level, a relative power ratio between Resource Elements (REs) for at least one of a Physical Downlink Control Channel (PDCCH) or a Physical Control Format Indicator Channel (PCFICH) and REs for reference signals from each radio network in which the at least one of the PDCCH or the PCFICH is received;

receiving interference from at least one of the each wireless network from which at least one of the PDCCH or the PCFICH is received; and

canceling the interference in the received signal based on the information.