Apparatus and methods related to improved channel quality information feedback

Abstract

The present disclosure relates to apparatuses and methods related to improved channel quality information feedback. In one embodiment, a user equipment includes a processor coupled to a radio frequency (RF) receiver, the processor configured to receive, based on a channel state information (CSI) reference resource of a shared wireless downlink channel and first three orthogonal frequency division multiplexing (OFDM) symbols of the CSI reference resource occupied by a control signal, a first frequency division multiplexing (OFDM) symbol of the CSI reference resource occupied by the control signal, and a second frequency division multiplexing (OFDM) symbol of the first three orthogonal frequency division multiplexing (OFDM) symbol of the first three orthogonal frequency division multiplexing (OFDM) symbol of the CSI reference resource occupied by the control signal. Deriving a channel quality indicator (CQI) index for a frequency band of an orthogonal frequency division multiple access (OFDMA) wireless communication system; and an RF transmitter coupled to the processor, the RF transmitter configured to transmit an electromagnetic signal representative of the CQI index on a wireless uplink channel. Other embodiments are described and claimed.

Description

[0001] Division Statement

[0002] This application is a divisional application filed again for the divisional application with the application date of December 23, 2013, the application number of 202210600579.X and the invention name of “User Equipment and Base Station”. The divisional application with the application number of 202210600579.X is a divisional application of the Chinese invention patent application with the application date of December 23, 2013, the application number of 201910496526.6 and the invention name of “Improved Channel Quality Information Feedback Technology”. The Chinese invention patent application with the application number of 201910496526.6 is a divisional application of the Chinese invention patent application with the application date of December 23, 2013, the application number of 201380063285.7 and the invention name of “Improved Channel Quality Information Feedback Technology”. Technical Field

[0003] The disclosed embodiments generally relate to wireless mobile broadband communications. Background Art

[0004] In a wireless radio access network such as an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), channel quality feedback techniques may be implemented to enable an evolved node base station (eNB) to use an appropriate modulation and coding scheme (MCS) when sending messages to a user equipment (UE). According to some such techniques, UEs may periodically and / or aperiodically send channel quality indicator (CQI) indexes to their serving eNBs. Each CQI index may indicate that the UE expects to be suitable for use in the transmission of an intended message from the eNB to the UE during a particular subframe.

[0005] In some cases, each transmitted message may be sent as one or more resource elements (REs) within one or more resource blocks, and the MCS that is actually most appropriate for sending a particular message may depend on the structure of the resource blocks containing it. Since the actual structure of such resource blocks cannot be known to the UE until after they are received, the UE may define a channel state information (CSI) reference resource based on which CQI index is selected. Each CSI reference resource may include a common expected structure for a resource block, via which its associated UE may expect to receive an expected message during a particular subframe. Once the CSI reference resource for a given subframe is defined, the UE may select a CQI index for that subframe based on the CSI reference resource.

[0006] In certain wireless radio access networks, the use of certain features may affect the structure of resource blocks that carry messages to UEs. For example, when an enhanced physical downlink control channel (EPDCCH) is implemented within a physical downlink shared channel (PDSCH) of E-UTRAN, certain REs within a PDSCH resource block may be allocated to the EPDCCH. In another example, for any particular PDSCH resource block, the number of REs containing cell-specific reference signals (CRS) may depend on the number of CRS antenna ports configured to transmit the PDSCH resource block to the eNB. In order to enable appropriate MCS selection, it may be desirable to take such effects into account in conjunction with CQI index reporting and / or interpretation, either by incorporating them into the definition of CSI reference resources on the UE side or by compensating for them on the eNB side. Summary of the invention

[0007] Some embodiments of the present disclosure provide a user equipment (UE), comprising: a processor coupled to a radio frequency (RF) receiver, the processor being configured to derive a channel quality indicator (CQI) index of a frequency band of an orthogonal frequency division multiple access (OFDMA) wireless communication system based on a channel state information (CSI) reference resource of a shared wireless downlink channel, the first three orthogonal frequency division multiplexing (OFDM) symbols of the CSI reference resource being occupied by a control signal; and an RF transmitter coupled to the processor, the RF transmitter being used to send an electromagnetic signal representing the CQI index on a wireless uplink channel.

[0008] Some embodiments of the present disclosure provide a user equipment (UE), comprising: a processor coupled to a radio frequency (RF) receiver, wherein the processor is configured to: receive a channel state information (CSI) reference signal (CSI-RS) and a CSI interference measurement (CSI-RM) resource, calculate interference measurement of the CSI-RM resource, and derive a channel quality indicator (CQI) index based on the interference measurement and a reference resource of a physical downlink shared channel (PDSCH); and an RF transmitter coupled to the processor, the RF transmitter being used to send the CQI index on a wireless uplink channel.

[0009] Some embodiments of the present disclosure provide a base station, including a processor, the processor being configured to: receive a channel quality indicator (CQI) index of a physical downlink shared channel (PDSCH); determine an enhanced physical downlink control channel (EPDCCH) overhead of one or more resource blocks of the PDSCH; and based on the CQI index and the EPDCCH overhead, select a modulation and coding scheme (MCS) for transmitting a message through the one or more resource blocks, wherein the CQI index corresponds to a channel state information (CSI) reference resource defined as not including the EPDCCH overhead; and an RF transmitter coupled to the processor, the RF transmitter being configured to send the message based on the MCS. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 One embodiment of an operating environment is shown.

[0011] Figure 2 An embodiment of a first device and an embodiment of a first system are shown.

[0012] Figure 3 One implementation of a first logic flow is shown.

[0013] Figure 4 An embodiment of a second device and an embodiment of a second system are shown.

[0014] Figure 5 One implementation of the second logic flow is shown.

[0015] Figure 6 An embodiment of a storage medium is shown

[0016] Figure 7 One implementation of a computing architecture is shown.

[0017] Figure 8 One embodiment of a communication system is shown. DETAILED DESCRIPTION

[0018] Various embodiments generally relate to improved channel quality information feedback techniques. In one embodiment, for example, an evolved node base station (eNB) may include: a processor circuit; a communication component executed by the processor circuit, which receives a channel quality index for a physical downlink shared channel (PDSCH), the channel quality index being associated with a defined reference resource; and a selection component executed by the processor circuit, which selects a modulation and coding scheme (MCS) for PDSCH transmission of data via a user equipment (UE) in one or more resource blocks, the selection component compensating for a difference between a cell-specific reference signal (CRS) overhead of the defined reference resource and the CRS overhead of the one or more resource blocks when selecting the MCS. Other embodiments are described and claimed.

[0019] Various embodiments may include one or more elements. The element may include any structure that is arranged to perform certain operations. As desired by a given set of design parameters or performance constraints, each element may be implemented as hardware, software, or any combination thereof. Although the embodiment may be described by way of example with a limited number of elements of a certain topology, the embodiment may include more or less elements of an optional topology as desired by a given implementation. It is noteworthy that any reference to "an embodiment" or "an embodiment" refers to a specific feature, structure, or characteristic described in conjunction with the embodiment to be included in at least one embodiment. The appearance of the terms "in one embodiment", "in certain embodiments", and "in various embodiments" in the specification may not necessarily refer to the same embodiment.

[0020] The technology disclosed herein may involve transmission of data via one or more wireless connections using one or more wireless mobile broadband technologies. For example, various embodiments may involve transmission via one or more wireless connections based on one or more Third Generation Partnership Project (3GPP), 3GPP Long Term Evolution (LTE), and / or 3GPP LTE-Advanced (LTE-A) technologies and / or standards, including their revisions, derivatives, and variations. More specifically, various embodiments may involve transmission over one or more wireless connections based on technologies and / or standards included in 3GPP Release 11, initially released in the third quarter of 2012, including their revisions, derivatives, and variations. Hereinafter, such embodiments will be referred to as "3GPP Rel-11" embodiments.

[0021] Certain embodiments may additionally or alternatively involve transmissions in accordance with one or more Global System for Mobile Communications (GSM) / Enhanced Data Rates for GSM Evolution (EDGE), Universal Mobile Telecommunications System (UMTS) / High Speed ​​Packet Access (HSPA), and / or GSM with General Packet Radio Service (GPRS) systems (GSM / GPRS) technologies and / or standards, including their amendments, derivatives, and variations. Examples of wireless mobile broadband technologies may also include, without limitation, any of the following: Institute of Electrical and Electronics Engineers (IEEE) 802.16m and / or 802.16p, International Mobile Telecommunications Advanced (IMT-ADV), Worldwide Interoperability for Microwave Access (WiMAX) and / or WiMAX II, Code Division Multiple Access (CDMA) 2000 (e.g., CDMA2000lxRTT, CDMA2000 EV-DO, CDMA EV-DV, etc.), High Performance Radio Metropolitan Area Network (HIPERMAN), Wireless Broadband (WiBro), High Speed ​​Downlink Packet Access (HSDPA), High Speed ​​Orthogonal Frequency Division Multiplexing (OFDM) Packet Access (HSOPA), High Speed ​​Uplink Packet Access (HSUPA) technologies and / or standards, including their amendments, derivatives, and variations. The embodiments are not limited to this context.

[0022] In addition to transmission via one or more wireless connections, the technology disclosed herein may involve transmission of content via one or more wired connections through one or more wired communication media. Examples of wired communication media may include wires, cables, metal conductors, printed circuit boards (PCBs), backplanes, switch fabrics, semiconductor materials, twisted pairs, coaxial cables, optical fibers, and the like. Implementations are not limited in this context.

[0023] Reference is now made to the accompanying drawings, in which the same reference numerals are used throughout to refer to the same elements. In the following description, for the purpose of explanation, a large number of specific details are given to provide a thorough understanding thereof. However, it will be apparent that the new implementation can be practiced without these specific details. In other examples, well-known structures and devices are shown in block diagram form to facilitate their description. The purpose is to cover all modifications, equivalents, and substitutes consistent with the claimed subject matter.

[0024] Figure 1 An example of an operating environment 100 is shown that may be representative of various implementations. Figure 1As shown, the mobile device 102 communicates with the fixed device 104 via an uplink channel 106 and a downlink channel 108. In some 3GPP Rel-11 implementations, the mobile device 102 may include a user equipment (UE), the fixed device 104 may include an evolved node base station (eNB), the uplink channel 106 may include a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), and the downlink channel 108 may include a physical downlink shared channel (PDSCH). The implementations are not limited in this context.

[0025] To determine parameters such as a modulation and coding scheme used in data transmission to the user equipment 102 via the downlink channel 108, the fixed device 104 may send a reference signal 110 to the mobile device 102 via the downlink channel 108. The mobile device 102 may perform channel estimation for the downlink channel 108 based on the reference signal 110, select a channel quality index 112 based on the channel estimation, and send the channel quality index 112 to the fixed device 104 via the uplink channel 106. The fixed device 104 may then apply parameters defined by the channel quality index 112 to send a message 114 to the mobile device 102 via the downlink channel 108. In various 3GPP Rel-11 implementations, the reference signal 110 may include one or more resource elements (REs) within one or more resource blocks, and the channel quality index 112 may include a channel quality indicator (CQI) index. The implementations are not limited in this context.

[0026] In some embodiments, the mobile device 102 may define a general expected structure of reference resources including resource blocks, via which the mobile device 102 may receive the message 114. Based on the quality of the reference signal 110 received by the mobile device 102 via the downlink channel 108, the mobile device 102 may then select a channel quality index 112 that defines a transmission parameter estimated by the mobile device 102 to produce a specific level of quality of received data within the reference resource transmitted from the fixed device 104 to the mobile device 102. For example, the mobile device 102 may select a channel quality index 112 that indicates the most efficient modulation and coding scheme via which the mobile device 102 estimates that it can receive data within the reference resource via the downlink channel 108 with a transmission block error probability of no more than 10%. In various 3GPP Rel-11 embodiments, the reference resource may include a channel state information (CSI) reference resource. The embodiments are not limited in this context.

[0027] In some embodiments, the quality of data that the mobile device 102 may expect to receive within the reference resource may depend on the structure of the reference resource, and thus the selection of the channel quality index 112 may depend on the structure of the reference resource. For example, in various embodiments, the reception quality level estimated by the mobile device 102 may depend on how many REs in the reference resource are assumed to include data intended for the mobile device 102 and how many REs are assumed to include data associated with various types of overhead. In some embodiments, the mobile device 102 may therefore be configured to select the channel quality index 112 based in part on a number of resource elements (REs) in the reference resource that are assumed to contain data intended for the mobile device 102. In various embodiments, the selection of the channel quality index 112 may additionally or alternatively depend on one or more assumptions about the source of the transmission of the reference resource. For example, in some embodiments, the mobile device 102 may be configured to select the channel quality index 112 based in part on the assumption that the reference resource is transmitted from the same location as the location where the fixed device 104 transmits the reference signal 110, rather than from another location and / or fixed device. The embodiments are not limited in this context.

[0028] In various embodiments, the selected channel quality index 112 may not define transmission parameters suitable for transmission of the message 114 to the mobile device 102 if the structure of the resource blocks containing the message 114 and / or their transmission source differ significantly from the assumption associated with the reference resource. For example, if the message 114 includes a different number of REs containing data intended for the mobile device 102 than what was assumed with respect to the reference resource, the selected channel quality index 112 may not be suitable for transmission of the message 114. In another example, if it had been assumed that the reference resource was transmitted from the same location as the reference signal 110 but then the message 114 is contained in a resource block transmitted from a different location than the reference signal 110, the selected channel quality index 112 may not be suitable for transmission of the message 114. Embodiments are not limited to this example.

[0029] In some embodiments, the use of certain features can affect the structure, transmission source and / or other characteristics of the downlink channel resource blocks. For example, in various embodiments, a downlink control channel implemented within the downlink channel 108 can occupy REs within the resource blocks of the downlink channel 108. In another example, in some embodiments, certain downlink channel resource block REs can be allocated to one or more cell-specific reference signals (CRS) corresponding to one or more CRS antenna ports of the fixed device 104. In order to enable appropriate selection of transmission parameters such as the MCS for the message 114, it may be desirable to consider such effects in conjunction with the selection of the channel quality index 112 at the mobile device 102 and / or the interpretation of the channel quality index 112 at the fixed device 104.

[0030] Disclosed herein is an improved channel quality information feedback technique that can enable selection of appropriate transmission parameters by considering one or more features that affect the structure, transmission source, and / or other characteristics of downlink channel resource blocks. In various embodiments, such considerations can be performed on the mobile device side, where reference resources can be defined to take such features into account. In certain embodiments, such considerations can alternatively or additionally be performed on the fixed device side, where compensation for such features can be performed during transmission parameter selection. The embodiments are not limited in this context.

[0031] Figure 2 A block diagram of an apparatus 200 is shown, which may include various embodiments. Figure 1 More specifically, the apparatus 200 includes an example of a mobile device that can be configured to define reference resources, such as taking into account features that affect the structure of downlink channel resource blocks. In certain 3GPP Rel-11 implementations, the apparatus 200 may include a UE. Figure 2 As shown, the apparatus 200 includes a plurality of components including a processor circuit 202 and a memory unit 204. However, the embodiments are not limited to Figure 2 The type, quantity or arrangement of components shown.

[0032] In certain embodiments, the apparatus 200 may include a processor circuit 202. The processor circuit 202 may be implemented using any processor or logic device such as a complex instruction set computer (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, an x86 instruction set compatible processor, a processor that implements a combination of instruction sets, a multi-core processor such as a dual-core processor or a dual-core mobile processor, or any other microprocessor or central processing unit (CPU). The processor circuit 202 may also be implemented as a special-purpose processor such as a controller, a microcontroller, an embedded processor, a chip multiprocessor (CMP), a coprocessor, a digital signal processor (DSP), a network processor, a media processor, an input / output (I / O) processor, a media access control (MAC) processor, a radio baseband processor, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), etc. In one embodiment, for example, the processor circuit 202 may be implemented as a general-purpose processor such as a processor provided by a company in Santa Clara, California. The embodiments are not limited in this context.

[0033] In various embodiments, the apparatus 200 may include or be arranged to be communicatively coupled with a memory unit 204. The memory unit 204 may use any machine-readable or computer-readable medium capable of storing data, including both volatile and non-volatile memory. For example, the memory unit 204 may include a read-only memory (ROM), a random access memory (RAM), a dynamic RAM (DRAM), a double data rate DRAM (DDRAM), a synchronous DRAM (SDRAM), a static RAM (SRAM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a flash memory, a polymer memory such as a ferroelectric polymer memory, an Austenite memory, a phase change or ferroelectric memory, a silicon-oxide-nitride-oxide-silicon (SONOS) memory, a magnetic card or an optical card, or any other type of medium suitable for storing information. It is worth noting that some or all of the memory unit 204 may be included on the same integrated circuit as the processor circuit 202, or alternatively, some or all of the memory unit 204 may be placed on an integrated circuit or other medium, such as a hard drive external to the integrated circuit of the processor circuit 202. Although in Figure 2 The memory unit 204 is included within the device 200, but in some embodiments, the memory unit 204 may be external to the device 200. The embodiments are not limited in this context.

[0034] Figure 2 A block diagram of system 240 is also shown. System 240 may include any of the aforementioned elements of device 200. System 240 may further include one or more additional components. For example, in various embodiments, system 240 may include a radio frequency (RF) transceiver 244. RF transceiver 244 may include one or more radios capable of using various appropriate wireless communication technologies to send and receive signals. Such technology may involve communication across one or more wireless networks. Exemplary wireless networks include, but are not limited to, wireless local area networks (WLANs), wireless personal area networks (WPANs), wireless metropolitan area network (WMANs), cellular networks, and satellite networks. In such network communications, RF transceiver 244 may operate according to one or more applicable standards of any version. Embodiments are not limited to this background.

[0035] In some embodiments, system 240 may include one or more RF antennas 257. Examples of any particular RF antenna 257 may include an internal antenna, an omnidirectional antenna, a monopole antenna, a dipole antenna, an end-fed antenna, a circularly polarized antenna, a microstrip antenna, a diversity antenna, a dual antenna, a tri-band antenna, a quad-band antenna, etc. Embodiments are not limited to these examples.

[0036] In various embodiments, system 240 may include display 245. Display 245 may include any display device capable of displaying information received from processor circuit 202. Examples of display 245 may include televisions, monitors, projectors, and computer screens. In one embodiment, for example, display 245 may be implemented by a liquid crystal display (LCD), a light emitting diode (LED), or an appropriate visual interface of other types. Display 245 may include, for example, a touch-sensitive display screen ("touch screen"). In various implementations, display 245 may include one or more thin film transistor (TFT) LCDs, including embedded transistors. Embodiments are not limited to this background.

[0037] In general operation, the apparatus 200 and / or system 240 may be used to select a channel quality index 206 for transmission to the fixed device 250. In various embodiments, the channel quality index 206 may include information indicating and / or corresponding to one or more transmission parameters used by the fixed device 250 in transmitting data to the apparatus 200 and / or system 240. For example, in some embodiments, the channel quality index 206 may include an index number corresponding to a modulation and coding scheme used by the fixed device 250. In various 3GPP Rel-11 embodiments, the channel quality index 206 may include a channel quality indicator (CQI) index. The embodiments are not limited in this context.

[0038] In some embodiments, the apparatus 200 and / or the system 240 may include a communication component 208. The communication component 208 may include logic, circuitry, and / or instructions for sending messages to and / or receiving messages from the fixed device 250. In various embodiments, the communication component 208 may be used to transmit and / or receive messages via the RF transceiver 244 and one or more RF antennas 257. In some embodiments, the communication component 208 may be used to generate and / or process messages in accordance with one or more wireless communication standards. For example, in various 3GPP Rel-11 embodiments, the communication component 208 may be used to generate and / or process messages in accordance with one or more 3GPP specifications. The embodiments are not limited in this context.

[0039] In various embodiments, the communication component 208 can be used to receive a reference signal 210 from a fixed device 250. In some embodiments, the reference signal 210 may include a signal for use by the device 200 and / or the system 240 to estimate the quality of a downlink channel 212 from the fixed device 250 to the device 200 and / or the system 240. In various embodiments, the reference signal 210 may include information in one or more resource elements and / or resource blocks in one or more subframes and / or frames sent by the fixed device 250 via the downlink channel 212. In some 3GPP Rel-11 embodiments, the reference signal 210 may include a channel state information reference signal (CSI-RS) and a channel state information interference measurement (CSI-IM) resource. In various embodiments, the downlink channel 212 may include a shared channel. For example, in some 3GPP Rel-11 embodiments, the downlink channel 212 may include a PDSCH. The embodiments are not limited to this context.

[0040] In various embodiments, the apparatus 200 and / or the system 240 may include a determining component 214. The determining component 214 may include logic, circuitry, and / or instructions for determining a reception quality parameter 216 for the reference signal 210. In certain embodiments, the reception quality parameter 216 may include an estimated channel quality for the downlink channel 212. In various embodiments, the determining component 214 may be configured to determine the reception quality parameter 216 based on the power of various resource elements at which the reference signal 210 is received. In certain 3GPP Rel-11 embodiments, the reception quality parameter 216 may include a channel measurement for the CSI-RS and an interference measurement for the CSI-IM resource. The embodiments are not limited in this context.

[0041] In various embodiments, the determining component 214 may be used to define a reference resource 218 for the downlink channel 212. The reference resource 218 may include a generic expected structure of resource blocks via which the apparatus 200 and / or the system 240 may expect to receive messages via the downlink channel 212. In certain 3GPP Rel-11 embodiments, the reference resource 218 may include a CSI reference resource. In various embodiments, the determining component 214 may be used to define the reference resource 218 to include data REs 220 and overhead REs 222. The data REs 220 may include REs defined as being allocated to the reference resource 218 for use in conveying a message expected to be sent via the reference resource 218, while the overhead REs 222 may include REs allocated to be used in implementing various wireless network features. In certain embodiments, the number of data REs 220 in the reference resource 218 may depend on the number of overhead REs 222 in the reference resource 218. In various embodiments, determining component 214 can be used to define reference resources 218 by allocating all overhead REs 222 required by any configured wireless network characteristics, and then designating the remaining available REs in reference resources 218 as data REs 220. Embodiments are not limited in this context.

[0042] In some embodiments, the determining component 214 may be used to define the reference resource 218 to include one or more overhead REs 222 allocated to a downlink control channel implemented within the downlink channel 212. In various 3GPP Rel-11 embodiments, the downlink control channel may include an enhanced physical downlink control channel (EPDCCH). In some 3GPP Rel-11 embodiments, the apparatus 200 and / or the system 240 may include a UE configured with one or both of EPDCCH physical resource blocks (PRB) group 0 and EPDCCH-PRB group 1. In various 3GPP Rel-11 embodiments, the determining component 214 may be used to define the reference resource 218 to include one or more overhead REs 222 allocated to EPDCCH-PRB group 0. In some 3GPP Rel-11 embodiments, the determining component 214 may be used to define the reference resource 218 to include one or more overhead REs 222 allocated to EPDCCH-PRB group 1. In various 3GPP Rel-11 implementations, determining component 214 may be used to define reference resources 218 to include one or more overhead REs 222 allocated to EPDCCH-PRB group 0 and to also include one or more overhead REs 222 allocated to EPDCCH-PRB group 1. The implementations are not limited in this context.

[0043] It is worth noting that in some embodiments, rather than defining the reference resource 218 such as to take into account the implementation of a downlink control channel within the downlink channel 212, the determining component 214 can be used to define the reference resource 218 without taking into account whether the downlink control channel is implemented. In various such embodiments, the determining component 214 can be used to define the reference resource 218 such that no overhead RE 222 in the reference resource 218 is allocated to the downlink control channel. For example, in some 3GPP Rel-11 embodiments, the determining component 214 can be used to define the reference resource 218 such that the overhead RE 222 does not include REs that include EPDCCH overhead. In such embodiments, compensation for the use of the EPDCCH can be performed on the eNB side. The embodiments are not limited to this context.

[0044] In various embodiments, the determining component 214 can be used to define the reference resources 218 to include one or more overhead REs 222 containing cell-specific reference signal (CRS) overhead. In certain 3GPP Rel-11 embodiments, the determining component 214 can be used to define the reference resources 218 in conjunction with CSI processing for the apparatus 200 and / or the system 240, and the CSI processing can be configured with a PMI / RI report. In various 3GPP Rel-11 embodiments, the determining component 214 can be used to define the reference resources 218 to include a plurality of CRS overhead REs 222 corresponding to a plurality of CRS antenna ports configured to a serving cell of the apparatus 200 and / or the system 240. In certain 3GPP Rel-11 embodiments, the determining component 214 can be used to define the reference resources 218 to include a plurality of CRS overhead REs 222 corresponding to a plurality of CRS antenna ports associated with a PDSCH RE mapping and a quasi-position indicator (PQI) having a lowest index value. In various 3GPP Rel-11 implementations, for any given CSI process, determining component 214 can be used to define reference resources 218 to include multiple CRS overhead REs 222 corresponding to multiple CRS antenna ports associated with non-zero power (NZP) CSI-RS for that CSI process. The implementations are not limited in this context.

[0045] In some embodiments, the apparatus 200 and / or the system 240 may include a selection component 224. The selection component 224 may include logic, circuitry, and / or instructions for selecting a channel quality index 206 for transmission to the fixed device 250. In various embodiments, the selection component 224 may be configured to select the channel quality index 206 based on the reception quality parameter 216 and the reference resource 218 defined by the determination component 214. In some embodiments, the selection component 224 may be configured to select a channel quality index 206 indicating the most effective MCS via which it is estimated that the message can be received via the reference resource 218 with a specific accuracy and / or quality level. For example, in various 3GPP Rel-11 embodiments, the selection component 224 may be configured to select a channel quality index 206 including a CQI index indicating the most effective MCS via which it is estimated that the message can be received via the reference resource 218 with a transport block error probability of no more than 10%. Embodiments are not limited to this example.

[0046] In some embodiments, the communication component 208 can be used to send the channel quality index 206 to the fixed device 250. In various embodiments, the communication component 208 can be used to send the channel quality index 206 to the fixed device 250 via the uplink channel 220. In some 3GPP Rel-11 embodiments, the uplink channel 220 can include a PUSCH or a PUCCH. The embodiments are not limited in this context.

[0047] The operation for the above embodiments can be further described with reference to the following figures and the attached examples. Certain figures may include logic flows. Although such figures presented here may include specific logic flows, it is understood that the logic flows only provide examples of how the general functionality described herein can be implemented. In addition, unless otherwise indicated, a given logic flow does not necessarily have to be executed in the order presented. In addition, a given logic flow may be implemented by hardware elements, software elements executed by a processor, or any combination thereof. The embodiments are not limited to this background.

[0048] Figure 3 One embodiment of a logic flow 300 that may be representative of operations performed by one or more embodiments described herein is shown. More specifically, the logic flow 300 may include Figure 2 Examples of operations that apparatus 200 and / or system 240 may perform in conjunction with selection of channel quality index 206. Figure 3 As shown, a reference signal can be received at 302. For example, communication component 208 can be used to receive reference signal 210 via downlink channel 212. At 304, a reception quality parameter for the reference signal can be determined. For example, Figure 2The determining component 214 may be configured to determine a reception quality parameter 216 based on the power at which the reference signal 210 is received. At 306, a reference resource for a downlink channel may be defined. For example, Figure 2 The determination component 214 may be used to define a reference resource 218 for the downlink channel 212. In various embodiments, the reference resource may be defined to include one or more REs allocated to a downlink control channel implemented within the downlink channel. In some embodiments, the reference resource may be defined to include a set of CRS overhead REs.

[0049] At 308, a channel quality index may be selected based on the reception quality parameter and the reference resource. For example, Figure 2 The selection component may be used to select the channel quality index 206 based on the reception quality parameter 216 and the reference resource 218. At 310, the channel quality index may be sent via an uplink channel. For example, Figure 2 The communication component 208 can be used at the RF transceiver 244 to send the channel quality index 206 via the uplink channel 220. The embodiments are not limited to these examples.

[0050] Figure 4 An embodiment of an apparatus 400 is shown, which may include Figure 1 Fixed equipment 104 and / or Figure 2 More specifically, the apparatus 400 may include an example of a fixed device that may be configured to select transmission parameters for a downlink channel, such as to take into account features of the structure of resource blocks that affect the downlink channel. In various 3GPP Rel-11 implementations, the apparatus 400 may include an eNB. Figure 4 As shown, the apparatus 400 includes a plurality of components including a processor circuit 402 and a memory unit 404. However, the embodiments are not limited to Figure 4 The type, quantity, or arrangement of components shown.

[0051] In some embodiments, the apparatus 400 may include a processor circuit 402. The processor circuit 402 may be implemented using any processor or logic device and may be implemented with Figure 2 The processor circuit 202 of the embodiment is the same or similar. In various embodiments, the apparatus 400 may include or be arranged to be communicatively coupled with a memory unit 404. The memory unit 404 may be implemented using any machine-readable or computer-readable medium capable of storing data, including both volatile and non-volatile memory, and may be connected to the memory unit 404. Figure 2 The memory unit 204 is the same or similar.

[0052] Figure 4Also shown is a block diagram of a system 440. The system 440 may include any of the aforementioned elements of the apparatus 400. The system 440 may further include one or more additional components. For example, in various embodiments, the system 440 may include a radio frequency (RF) transceiver 444. The RF transceiver 444 may include one or more radios capable of sending and receiving signals using various suitable wireless communication technologies, and may communicate with the apparatus 400. Figure 2 In some embodiments, the system 440 may include one or more RF antennas 457. Examples of any particular RF antenna 457 may include those described above with respect to Figure 2 The RF antenna 257 may be any of the examples mentioned. The embodiments are not limited in this context.

[0053] In general operation, the apparatus 400 and / or system 440 may be used to select one or more transmission parameters for use in sending the message 435 to the mobile device 450 via the downlink channel 412. In some embodiments, the one or more transmission parameters may include a modulation and coding scheme. In various 3GPP Rel-11 embodiments, the apparatus 400 and / or system 440 may include an eNB, the mobile device 450 may include a UE, and the downlink channel 412 may include a PDSCH. In some embodiments, the apparatus 400 and / or system 440 may be used to receive a channel quality index 406 from the mobile device 450 and select the one or more transmission parameters based at least in part on the channel quality index 406. In various 3GPP Rel-11 embodiments, the channel quality index 406 may include a CQI index. The embodiments are not limited in this context.

[0054] In some embodiments, the apparatus 400 and / or the system 440 may include a communication component 408. The communication component 408 may include logic, circuitry, and / or instructions for transmitting messages to and / or receiving messages from the mobile device 450. In various embodiments, the communication component 408 may be used to send and / or receive messages via the RF transceiver 444 and one or more RF antennas 457. In some embodiments, the communication component 408 may be used to generate and / or process messages according to one or more wireless communication standards. For example, in various 3GPP Rel-11 embodiments, the communication component 408 may be used to generate and / or process messages according to one or more 3GPP specifications. The embodiments are not limited to this context.

[0055] In various embodiments, the communication component 408 can be used to receive the channel quality index 406 from the mobile device 450 via the uplink channel 420. In some 3GPP Rel-11 embodiments, the uplink channel 420 can include a PUSCH or a PUCCH. In various embodiments, the mobile device 450 can define a reference resource and select the channel quality index 406 based on the defined reference resource. In some 3GPP Rel-11 embodiments, the reference resource can include a CSI reference resource. In various such embodiments, due to one or more overheads, the structure of the resource blocks of the downlink channel 412 to be used to send the message 435 can be different from the defined reference resource. The embodiments are not limited in this context.

[0056] In some embodiments, the apparatus 400 and / or the system 440 may include a determining component 414. The determining component 414 may include logic, circuitry, and / or instructions for determining one or more overheads of a resource block of the downlink channel 412. In various embodiments, the one or more overheads may occupy one or more REs in the one or more resource blocks.

[0057] In some embodiments, the determination component 414 may be used to determine the overhead corresponding to the implementation of the downlink control channel within the downlink channel 412. In various embodiments, the determination component 414 may be used to determine a plurality of REs in each resource block of the downlink channel 412 allocated to the downlink control channel. In some 3GPP Rel-11 embodiments, the downlink control channel may include an enhanced physical downlink control channel (EPDCCH). In various 3GPP Rel-11 embodiments, the channel quality index 406 may include a CQI index corresponding to a CSI reference resource defined as including no EPDCCH overhead. In some 3GPP Rel-11 embodiments, the determination component 414 may be used to determine the EPDCCH overhead corresponding to one or more EPDCCH physical resource block (PRB) groups configured for the downlink channel 412. In various 3GPP Rel-11 embodiments, the determination component 414 may be used to determine the EPDCCH overhead corresponding to EPDCCH PRB group 0, corresponding to EPDCCH PRB group 1, or both. The embodiments are not limited to this context.

[0058] In some embodiments, the determining component 414 can be used to determine a cell-specific reference signal (CRS) overhead for one or more resource blocks of the downlink channel 412. In various embodiments, the CRS overhead for the one or more resource blocks of the downlink channel 412 can correspond to a plurality of CRS antenna ports used by the apparatus 400 and / or the system 440. In some embodiments, the CRS overhead for the one or more resource blocks can be different from the CRS overhead of the reference resource on which the channel quality index 406 is selected. In various such embodiments, the plurality of CRS REs in the one or more resource blocks can be different from the plurality of CRS REs in the reference resource. In some embodiments, the CRS overhead for the reference resource can include a plurality of REs corresponding to a plurality of CRS antenna ports configured for a serving cell of the mobile device 450. In various embodiments, the CRS overhead for the reference resource can include a plurality of REs corresponding to a plurality of CRS antenna ports associated with a PDSCH RE mapping and a quasi-position indicator (PQI) state having a lowest index value. In some embodiments, the CRS overhead for reference resources may include multiple REs corresponding to multiple CRS antenna ports associated with non-zero power (NZP) CSI-RS for CSI processing of mobile device 450. Embodiments are not limited in this context.

[0059] In various embodiments, the apparatus 400 and / or the system 440 may include a selection component 424. The selection component 424 may include logic, circuitry, and / or instructions for selecting a modulation and coding scheme (MCS) for sending the message 435 to the mobile device 450 via the downlink channel 412. In certain 3GPP Rel-11 embodiments, the message 435 may include UE data in one or more PDSCH resource blocks. The embodiments are not limited in this context.

[0060] In various embodiments, the selection component 424 can be used to select an MCS based on a channel quality index 406 on a downlink control channel overhead and / or a CRS overhead determined by the determination component 414. For example, in certain 3GPP Rel-11 embodiments, the selection component 424 can be used to select an MCS based on a determined EPDCCH overhead and a determined CRS overhead of a PDSCH resource block to be used to send the message 435. In various 3GPP Rel-11 embodiments, the selection component 424 can be used to compensate for a difference between a CRS overhead of a reference resource and a CRS overhead of a PDSCH resource block when selecting an MCS. In certain such 3GPP Rel-11 embodiments, the selection component 424 can be used to compensate for a difference between a plurality of CRS REs in a reference resource and a plurality of CRS REs in each of the one or more PDSCH resource blocks. In various embodiments, the channel quality index 406 can indicate a first MCS, and the selection component 424 can be used to select the first MCS or identify and select a second MCS based on a difference between the CRS overhead of the reference resource and the CRS overhead of the one or more PDSCH resource blocks, and / or based on the determined EPDCCH overhead. The embodiments are not limited in this context.

[0061] In some embodiments, the communication component 408 can be configured to send the message 435 to the mobile device 450 via the downlink channel 412. In various embodiments, the communication component 408 can be configured to send the message 435 using the MCS selected by the selection component 424 for one or more resource blocks of the downlink channel 412. In some embodiments, the communication component 408 can be configured to send the message 435 as data within one or more REs of the one or more resource blocks. The embodiments are not limited in this context.

[0062] Figure 5 One embodiment of a logic flow 500 is shown, which may be representative of operations performed by one or more embodiments described herein. More specifically, the logic flow 500 may include Figure 4 An example of operations that apparatus 400 and / or system 440 may perform in connection with selection of a modulation and coding scheme for transmission of message 435. Figure 5 As shown, a channel quality index may be received at 502. For example, Figure 4 The communication component 408 can be used to receive the channel quality index 406 from the mobile device 450 via the uplink channel 420. At 504, the overhead for the downlink channel can be determined. For example, Figure 4The determining component 414 in can be used to determine the overhead of one or more resource blocks of the downlink channel 412. In various embodiments, the overhead may include overhead associated with the implementation of a downlink control channel within the downlink channel. In some embodiments, the overhead may additionally or alternatively include CRS overhead of one or more resource blocks of the downlink channel. The embodiments are not limited to this context.

[0063] At 506, a modulation and coding scheme may be selected based on a channel quality index and an overhead of the downlink channel. Figure 4 The selection component 424 can be used to select a modulation and coding scheme to be used in sending the message 435 based on the channel quality index 406 and based on the overhead determined by the determination component 414. At 508, the message can be sent via the downlink channel using the selected modulation and coding scheme. For example, Figure 4 The communication component 408 can be used to send the message 435 to the mobile device 450 via one or more resource blocks of the downlink channel 412. The embodiments are not limited to these examples.

[0064] Figure 6 An embodiment of a storage medium 600 is shown. The storage medium 600 may include an article of manufacture. In one embodiment, the storage medium 600 may include any non-transient computer-readable medium or machine-readable medium, such as an optical, magnetic or semiconductor storage. The storage medium may store various types of computer-executable instructions, such as instructions that implement one or more of the logic flows 300 and 500. Examples of computer-readable or machine-readable storage media may include any tangible medium capable of storing electronic data, including volatile or non-volatile memory, removable or non-removable memory, erasable or non-erasable memory, writable or rewritable memory, etc. Examples of computer-executable instructions may include any appropriate type of code, such as source code, compiled code, interpreted code, executable code, static code, dynamic code, object-oriented code, visual code, etc. The embodiments are not limited to this background.

[0065] Figure 7 700 for use in a broadband wireless access network. The device 700 may implement, for example, the apparatus 200, the system 240, the apparatus 400, the system 440, the storage medium 600, and / or the logic circuit 728. For example, the logic circuit 728 may include physical circuits to perform the operations described for the apparatus 200 or the apparatus 400. Figure 7 As shown, device 700 may include a radio interface 710, baseband circuitry 720, and a computing platform 730, although embodiments are not limited to this configuration.

[0066] Device 700 may implement some or all of the structures and / or operations for apparatus 200, system 240, apparatus 400, system 440, storage medium 600, and / or logic circuit 728 in a single computing entity, such as entirely within a single device. Alternatively, device 700 may distribute portions of the structures and / or operations for apparatus 200, system 240, apparatus 400, system 440, storage medium 600, and / or logic circuit 728 across multiple computing entities using a distributed system architecture, such as a client-server architecture, a 3-tier architecture, an N-tier architecture, a tightly coupled or clustered architecture, a peer-to-peer architecture, a master-slave architecture, a shared database architecture, and other types of distributed systems. The embodiments are not limited in this context.

[0067] In one embodiment, although the embodiments are not limited to any specific air interface or modulation scheme, the radio interface 710 may include a component or combination of components suitable for sending and / or receiving single-carrier or multi-carrier modulated signals (e.g., including complementary code keying (CCK) and / or orthogonal frequency division multiplexing (OFDM) symbols). The radio interface 710 may include, for example, a receiver 712, a frequency synthesizer 714, and / or a transmitter 716. The radio interface 710 may include bias control, a crystal oscillator, and / or one or more antennas 718-f. In another embodiment, as desired, the radio interface 710 may use an external voltage-controlled oscillator (VCO), a surface acoustic wave filter, an intermediate frequency (IF) filter, and / or an RF filter. Due to the large number of potential RF interface designs, an extended description thereof is omitted.

[0068] The baseband circuit 720 may communicate with the radio interface 710 to process receive and / or transmit signals, and may include, for example, an analog-to-digital converter 722 for down-converting receive signals, a digital-to-analog converter 724 for up-converting transmit signals. In addition, the baseband circuit 720 may include a baseband or physical layer (PHY) processing circuit 726 for PHY link layer processing of the respective receive / transmit signals. The baseband circuit 720 may include, for example, a medium access control (MAC) processing circuit 727 for MAC / data link layer processing. The baseband circuit 720 may include a memory controller 732 for communicating with the MAC processing circuit 727 and / or the computing platform 730, for example, via one or more interfaces 734.

[0069] In some embodiments, the PHY processing circuit 726 may include a frame construction and / or detection module in conjunction with additional circuitry such as a buffer memory to construct and / or deconstruct communication frames and / or packets. Alternatively or in addition, the MAC processing circuit 727 may share processing for some of these functions or perform these processes independently of the PHY processing circuit 726. In some embodiments, the MAC and PHY processing may be integrated into a single circuit.

[0070] The computing platform 730 may provide computing functions for the device 700. As shown, the computing platform 730 may include a processing component 740. In addition to or in place of the baseband circuit 720, the device 700 may use the processing component 740 to perform processing operations or logic of the device 200, the system 240, the device 400, the system 440, the storage medium 600, and / or the logic circuit 728. The processing component 740 (and / or the PHY 726 and / or the MAC 727) may include various hardware elements, software elements, or a combination of the two. Examples of hardware elements may include devices, logic devices, components, processors, microprocessors, circuits, processor circuits (e.g., processor circuits 102), circuit elements (e.g., transistors, resistors, capacitors, inductors, etc.), integrated circuits, application specific integrated circuits (ASICs), programmable logic devices (PLDs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), memory cells, logic gates, registers, semiconductor devices, chips, microchips, chipsets, etc. Examples of software elements may include software components, programs, applications, computer programs, applications, system programs, software development programs, machine programs, operating system software, middleware, firmware, software modules, routines, subroutines, functions, methods, processes, software interfaces, application program interfaces (APIs), instruction sets, computing codes, computer codes, code segments, computer code segments, words, values, symbols, or any combination thereof. Determining whether to use hardware elements and / or software elements to implement an embodiment may vary according to any number of factors such as, for example, desired computing rates, power levels, thermal tolerances, processing cycle budgets, input data rates, output data rates, memory resources, data bus speeds, and other design or performance constraints as desired for a given implementation.

[0071] The computing platform 730 may further include other platform components 750. Other platform components 750 include common computing elements, such as one or more processors, multi-core processors, coprocessors, memory units, chipsets, controllers, peripherals, interfaces, oscillators, timing devices, video cards, audio cards, multimedia input / output (I / O) components (e.g., digital displays), power supplies, etc. Examples of memory cells may include, without limitation, various types of computer-readable and machine-readable storage media in the form of one or more higher-speed memory cells, such as read-only memory (ROM), random access memory (RAM), dynamic RAM (DRAM), double data rate DRAM (DDRAM), synchronous DRAM (SDRAM), static RAM (SRAM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, polymer memory such as ferroelectric polymer memory, Osram memory, phase change or ferroelectric memory, silicon-oxide-nitride-oxide-silicon (SONOS) memory, magnetic or optical cards, device arrays such as redundant array of independent disks (RAID) drives, solid-state memory devices (e.g., USB memory, solid-state drives (SSDs), and any other type of storage medium suitable for storing information).

[0072] Device 700 can be, for example, an ultra-mobile device, a mobile device, a fixed device, a machine-to-machine (M2M) device, a personal digital assistant (PDA), a mobile computing device, a smart phone, a phone, a digital phone, a cellular phone, a user device, an e-book reader, a handheld device, a one-way pager, a two-way pager, a messaging device, a computer, a personal computer (PC), a desktop computer, a laptop computer, a notebook computer, a netbook computer, a handheld computer, a tablet computer, a server, a server array or server farm, a web server, a network server, an Internet server, a workstation, a minicomputer, a mainframe computer, a supercomputer, a network appliance, a web appliance, a distributed computing system, a multiprocessor system, a processor-based system, a consumer electronic product, a programmable consumer electronic product, a gaming device, a television, a digital television, a set-top box, a wireless access point, a base station, a node B, a user station, a mobile user center, a radio network controller, a router, a hub, a gateway, a bridge, a switch, a machine, or a combination thereof. Therefore, as appropriately desired, the functions and / or specific configurations of device 700 described herein can be included in various embodiments of device 700 or omitted in various embodiments of device 700. In some embodiments, although the embodiments are not limited in this respect, device 700 can be configured to be compatible with protocols and frequencies associated with one or more of the 3GPP LTE specifications referenced herein and / or the IEEE 802.16 standard for WMAN, and / or other broadband wireless network associated protocols and frequencies.

[0073] Embodiments of device 700 may be implemented using a single-input single-output (SISO) architecture. However, some implementations may include multiple antennas (e.g., antenna 718-f) for transmitting and / or receiving using adaptive antenna techniques for beamforming or spatial division multiple access (SDMA) and / or using MIMO communication techniques.

[0074] The components and features of the device 700 may be implemented using any combination of discrete circuits, application specific integrated circuits (ASICs), logic gates, and / or single chip architectures. In addition, where appropriate, the features of the device 700 may be implemented using a microcontroller, a programmable logic array, and / or a microprocessor, or any combination thereof. It is noted that, herein, hardware, firmware, and / or software elements may be collectively or individually referred to as "logic" or "circuitry."

[0075] It should be understood that Figure 7 The exemplary device 700 shown in the block diagram of FIG. 700 may represent a functional description example of many potential implementations. Therefore, the division, omission or inclusion of block functions depicted in the drawings does not infer that the hardware components, circuits, software and / or elements used to implement these functions in the implementation will necessarily be divided, omitted or included.

[0076] Figure 8 8 shows an implementation of a broadband wireless access system 800. Figure 8 As shown, broadband wireless access system 800 may be an Internet Protocol (IP) type network, including an Internet 810 type network or the like capable of supporting mobile wireless access and / or fixed wireless access to Internet 810. In one or more embodiments, broadband wireless access system 800 may include any type of orthogonal frequency division multiple access (OFDMA) based wireless network, such as a system compatible with one or more of the 3GPP LTE specifications and / or the IEEE 802.16 standards, and the scope of the claimed subject matter is not limited in these respects.

[0077] In the exemplary broadband wireless access system 800, access service networks (ASNs) 812, 818 can be coupled with base stations (BSs) (or eNodeBs) 814, 820, respectively, to provide wireless communications between one or more fixed devices 816 and the Internet 810 and / or between one or more mobile devices 822 and the Internet 810. An example of the fixed device 816 and the mobile device 822 is the device 700, wherein the fixed device 816 includes a stationary version of the device 700 and the mobile device 822 includes a mobile version of the device 700. The ASNs 812, 818 can implement a profile that can define a mapping of network functions to one or more physical entities on the broadband wireless access system 800. The base stations (or eNodeBs) 814, 820 can include radio equipment to provide RF communications with the fixed device 816 and / or the mobile device 822, such as described with reference to the device 700, and can include, for example, PHY and MAC layer equipment compatible with the 3GPP LTE specification or the IEEE 802.16 standard. Although the scope of the claimed subject matter is not limited in these respects, base stations (or eNodeBs) 814, 820 may further include an IP backplane to couple to Internet 810 via ASNs 812, 818, respectively.

[0078] The broadband wireless access system 800 may further include a visit connection service network (CSN) 824, which can provide one or more network functions, including but not limited to: proxy and / or relay type functions, such as authentication, authorization and accounting (AAA) functions, dynamic host configuration protocol (DHCP) functions, or domain name service control, etc., domain gateways such as public switched telephone network (PSTN) gateways or voice over Internet protocol (VoIP) gateways, and / or Internet Protocol (IP) type server functions, etc. However, these are merely examples of various types of functions that can be provided by the visit CSN 824 or the home CSN 826, and the scope of the claimed subject matter is not limited in these respects. The visited CSN 824 may be referred to as a visited CSN in situations where the visited CSN 824 is not part of the regular service provider for the fixed device 816 or the mobile device 822, such as where the fixed device 816 or the mobile device 822 roams away from the respective home CSN 826, or where the broadband wireless access system 800 is part of the regular service provider for the fixed device 816 or the mobile device 822, but where the broadband wireless access system 800 may be in another location or state that is not the primary or home location of the fixed device 816 or the mobile device 822.

[0079] The fixed device 816 can be located anywhere within the range of one or both base stations (or eNodeBs) 814, 820, such as in or near a home or business to provide home or business customer broadband access to the Internet 810 via the base stations (or eNodeBs) 814, 820 and ASNs 812, 818, and home CSN 826, respectively. It is worth noting that although the fixed device 816 is generally placed in a stationary location, it can be moved to different locations as needed. For example, if the mobile device 822 is within the range of one or both base stations (or eNodeBs) 814, 820, the mobile device 822 can be utilized at one or more locations.

[0080] According to one or more embodiments, an operation support system (OSS) 828 may be a part of the broadband wireless access system 800 to provide management functions of the broadband wireless access system 800 and to provide interfaces between functional entities of the broadband wireless access system 800 . Figure 8 The broadband wireless access system 800 is merely one type of wireless network illustrating a certain number of components of the broadband wireless access system 800, and the scope of the claimed subject matter is not limited in these respects.

[0081] Various embodiments can be implemented using hardware elements, software elements or a combination of the two. The example of hardware elements can include processors, microprocessors, circuits, circuit elements (e.g., transistors, resistors, capacitors, inductors, etc.), integrated circuits, application specific integrated circuits (ASICs), programmable logic devices (PLDs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), logic gates, registers, semiconductor devices, chips, microchips, chipsets, etc. The example of software can include software components, programs, applications, computer programs, application programs, system programs, machine programs, operating system software, middleware, firmware, software modules, routines, subroutines, functions, methods, processes, software interfaces, application program interfaces (APIs), instruction sets, computing codes, computer codes, code segments, computer code segments, words, values, symbols or any combination thereof. Determining whether to use hardware elements and / or software elements to implement an embodiment can vary according to any number of factors, such as desired computing rate, power level, heat resistance, processing cycle budget, input data rate, output data rate, memory resources, data bus speed and other design or performance constraints.

[0082] One or more aspects of at least one embodiment can be implemented by representative instructions stored on a machine-readable medium representing various logics within a processor, which, when read by a machine, causes the machine-made logic to perform the techniques described herein. Such representations known as "IP cores" can be stored on tangible, machine-readable media and supplied to various customers or production facilities to be loaded into a manufacturing machine that actually manufactures logic or a processor. For example, some embodiments can be implemented using a machine-readable medium or article, which can store instructions or a set of instructions, which, if executed by a machine, can cause the machine to perform methods and / or operations according to the embodiments. Such a machine may include, for example, any appropriate processing platform, computing platform, computing device, processing device, computing system, processing system, computer, processor, etc., and may be implemented using any appropriate combination of hardware and / or software. The machine-readable medium or article of manufacture may include, for example, any suitable type of memory unit, memory device, memory article, memory medium, storage device, storage article, storage medium and / or storage unit, such as memory, removable or non-removable medium, erasable or non-erasable medium, writable or rewritable medium, digital or analog medium, hard disk, floppy disk, compact disk read only memory (CD-ROM), recordable compact disk (CD-R), rewritable compact disk (CD-RW), optical disk, magnetic media, magneto-optical media, removable memory cards or disks, various types of digital versatile disks (DVDs), magnetic tapes, cassettes, etc. The instructions may include any suitable type of code implemented using any suitable high-level, low-level, object-oriented, visual, compiled and / or interpreted programming language, such as source code, compiled code, interpreted code, executable code, static code, dynamic code, encrypted code, etc.

[0083] The following examples are among the more practical implementations:

[0084] Example 1 is a user equipment (UE), comprising: a processing circuit; a determination component executed on the processing circuit, which determines a reception quality parameter of a channel state information (CSI) reference signal for a downlink channel and defines a CSI reference resource for the downlink channel, the determination component defining the CSI reference resource to include one or more resource elements (REs) allocated to a downlink control channel implemented within the downlink channel; and a selection component executed on the processing circuit, which selects a channel quality indicator (CQI) index based on the reception quality parameter and the CSI reference resource.

[0085] In Example 2, the downlink channel of Example 1 may optionally include a physical downlink shared channel (PDSCH), and the downlink control channel may optionally include an enhanced physical downlink control channel (EPDCCH).

[0086] In Example 3, the UE of Example 2 may optionally be configured with one or more EPDCCH physical resource block (PRB) groups, and the determining component may optionally define the CSI reference resources based on the one or more EPDCCH PRB groups.

[0087] In Example 4, the selecting component of any one of Examples 1 to 3 may optionally define the CSI reference resources to include: one or more REs including cell-specific reference signal (CRS) overhead.

[0088] In Example 5, the CQI index of any one of Examples 1 to 4 may optionally identify a modulation and coding scheme (MCS) used to transmit the message to the UE via a downlink channel.

[0089] In Example 6, the reception quality parameter of any one of Examples 1 to 5 may optionally include a channel measurement for a CSI reference signal (CSI-RS) and an interference measurement for a CSI interference measurement (CSI-IM) resource.

[0090] In Example 7, the UE of any one of Examples 1 to 6 may optionally include: a display; a radio frequency (RF) transceiver; and one or more RF antennas.

[0091] Example 8 is a wireless communication method, comprising: at a user equipment (UE), receiving a channel state information (CSI) reference signal (CSI-RS) and a CSI interference measurement (CSI-IM) resource; calculating, by a processor, a channel measurement for the CSI-RS and an interference measurement for the CSI-IM resource; defining a reference resource for a physical downlink shared channel (PDSCH) to include a set of cell-specific reference signal (CRS) overhead resource elements (RE); and selecting a CQI index based on the channel measurement, the interference measurement, and the reference resource.

[0092] In Example 9, the wireless communication method of Example 8 may optionally include: defining reference resources such that the group of CRS overhead REs includes multiple REs corresponding to multiple CRS antenna ports of a serving cell configured for the UE.

[0093] In Example 10, the wireless communication method of Example 8 may optionally include: defining reference resources so that the group of CRS overhead REs includes multiple REs corresponding to multiple CRS antenna ports associated with the PDSCH RE mapping with the lowest index value and the quasi-position indicator (PQI) state.

[0094] In Example 11, the wireless communication method of Example 8 may optionally include: defining reference resources so that the group of CRS overhead REs includes multiple REs corresponding to multiple CRS antenna ports associated with non-zero power (NZP) CSI-RS for CSI processing of the UE.

[0095] In Example 12, the wireless communication method of any one of Examples 8 to 11 may optionally include: defining the reference resources to include one or more REs allocated to an enhanced physical downlink control channel (EPDCCH).

[0096] In Example 13, the CQI index of any one of Examples 8 to 12 may optionally indicate a modulation and coding scheme (MCS) used to transmit data to the UE in one or more PDSCH resource blocks.

[0097] Example 14 is at least one machine-readable medium comprising a set of instructions that, in response to being executed on a computing device, cause the computing device to perform a wireless communication method according to any one of Examples 8 to 13.

[0098] Example 15 is an apparatus comprising: a module for performing a wireless communication method according to any one of Examples 8 to 13.

[0099] Example 16 is an evolved node base station (eNB), comprising: a processor circuit; a communication component executed by the processor circuit, which receives a channel quality index for a physical downlink shared channel (PDSCH), the channel quality index being associated with a defined reference resource; and a selection component executed by the processor circuit, which selects a modulation and coding scheme (MCS) for transmission of user equipment (UE) data via the PDSCH in one or more resource blocks, the selection component compensating for a difference between a cell-specific reference signal (CRS) overhead of the defined reference resource and the CRS overhead of the one or more resource blocks when selecting the MCS.

[0100] In Example 17, the selecting component of Example 16 may optionally be performed by a processor circuit to compensate for a difference between a plurality of CRS resource elements (REs) in the defined reference resource and a plurality of CRS REs in each of the one or more resource blocks.

[0101] In Example 18, the channel quality index of any of Examples 16 to 17 may optionally indicate a first MCS, and the selection component may optionally be executed by a processor circuit to either select the first MCS or identify and select a second MCS based on a difference between the CRS overhead of the defined reference resource and the CRS overhead of the one or more resource blocks.

[0102] In Example 19, the selecting component of any one of Examples 16 to 18 may optionally be performed by a processor circuit to compensate for an enhanced physical downlink control channel (EPDCCH) implemented within the PDSCH when selecting the MCS.

[0103] In Example 20, the CRS overhead of the one or more resource blocks of any one of Examples 16 to 19 may optionally correspond to a plurality of CRS antenna ports used by the eNB.

[0104] In Example 21, the channel quality index of any one of Examples 16 to 20 may optionally include a channel quality indicator (CQI) index.

[0105] In Example 22, the reference resources defined in any one of Examples 16 to 21 may optionally include channel state information (CSI) reference resources.

[0106] Example 23 is at least one machine-readable medium comprising a set of wireless communication instructions that, in response to being executed on a computing device, cause the computing device to: receive a channel quality indicator (CQI) index for a physical downlink shared channel (PDSCH) at an evolved node base station (eNB); determine an enhanced physical downlink control channel (EPDCCH) overhead for one or more resource blocks of the PDSCH; and select a modulation and coding scheme (MCS) for transmitting a message via the one or more resource blocks based on the CQI index and the EPDCCH overhead.

[0107] In Example 24, the EPDCCH overhead of Example 23 may optionally correspond to one or more EPDCCH physical resource block (PRB) groups configured for the PDSCH.

[0108] In Example 25, the at least one machine-readable medium of any one of Examples 23 to 24 may optionally include wireless communication instructions that, in response to being executed on a computing device, cause the computing device to send a message via a set of resource elements (REs) in the one or more resource blocks.

[0109] In Example 26, the CQI index of any one of Examples 23 to 25 may optionally correspond to a channel state information (CSI) reference resource defined to include no EPDCCH overhead.

[0110] In Example 27, the at least one machine-readable medium of any one of Examples 23 to 26 may optionally include wireless communication instructions that, in response to being executed on a computing device, cause the computing device to determine a cell characteristic reference signal (CRS) overhead of the one or more resource blocks and select an MCS based on the CQI index, the EPDCCH overhead, and the CRS overhead.

[0111] Example 28 is a wireless communication method, comprising: at a user equipment (UE), determining, by a processor circuit, a reception quality parameter of a channel state information (CSI) reference signal for a downlink channel, defining a CSI reference resource for the downlink channel, the CSI reference resource comprising one or more resource elements (REs) allocated to a downlink control channel implemented within the downlink channel, and selecting a channel quality indicator (CQI) index based on the reception quality parameter and the CSI reference resource.

[0112] In Example 29, the downlink channel of Example 28 may optionally include a physical downlink shared channel (PDSCH), and the downlink control channel may optionally include an enhanced physical downlink control channel (EPDCCH).

[0113] In Example 30, the method of wireless communication of Example 29 may optionally include defining CSI reference resources based on one or more EPDCCH physical resource block (PRB) groups configured to the UE.

[0114] In Example 31, the wireless communication method of any one of Examples 28 to 30 may optionally include defining the CSI reference resources to include: one or more REs including cell-specific reference signal (CRS) overhead.

[0115] In Example 32, the CQI index of any one of Examples 28 to 31 may optionally identify a modulation and coding scheme (MCS) used to transmit the message to the UE via a downlink channel.

[0116] In Example 33, the reception quality parameter of any one of Examples 28 to 32 may optionally include a channel measurement for a CSI reference signal (CSI-RS) and an interference measurement for a CSI interference measurement (CSI-IM) resource.

[0117] Example 34 is at least one machine-readable medium comprising a set of instructions that, in response to being executed on a computing device, causes the computing device to perform a wireless communication method according to any one of Examples 28 to 33.

[0118] Example 35 is an apparatus comprising: a module for performing a wireless communication method according to any one of Examples 28 to 33.

[0119] Example 36 is a user equipment (UE) comprising: a processor; a determination component executed by the processor, which receives a channel state information (CSI) reference signal (CSI-RS) and a CSI interference measurement (CSI-IM) resource, calculates a channel measurement for the CSI-RS and an interference measurement for the CSI-IM resource, and defines a reference resource for a physical downlink shared channel (PDSCH) to include a set of cell-specific reference signal (CRS) overhead resource elements (RE); and a selection component executed by the processor, which selects a CQI index based on the channel measurement, the interference measurement, and the reference resource.

[0120] In Example 37, the determining component of Example 36 may optionally be configured to be executed by a processor to define reference resources such that the set of CRS overhead REs includes a plurality of REs corresponding to a plurality of CRS antenna ports of a serving cell configured for the UE.

[0121] In Example 38, the determining component of Example 36 may optionally be used to define reference resources executed by a processor such that the set of CRS overhead REs includes multiple REs corresponding to multiple CRS antenna ports associated with a PDSCH RE mapping and a quasi-position indicator (PQI) having a lowest index value.

[0122] In Example 39, the determination component of Example 36 may optionally be used to define reference resources executed by a processor such that the set of CRS overhead REs includes multiple REs corresponding to multiple CRS antenna ports associated with non-zero power (NZP) CSI-RS for CSI processing of the UE.

[0123] In Example 40, the determining component of any one of Examples 36 to 39 may optionally be used for execution by a processor to define the reference resources to include one or more REs allocated to an enhanced physical downlink control channel (EPDCCH).

[0124] In Example 41, the CQI index of any one of Examples 36 to 40 may optionally indicate a modulation and coding scheme (MCS) used for transmitting data to the UE in one or more PDSCH resource blocks.

[0125] Example 42 is a wireless communication method, comprising: at an evolved node base station (eNB), receiving a channel quality index for a physical downlink shared channel (PDSCH), the channel quality index being associated with a defined reference resource; selecting, by a processor circuit, a modulation and demodulation scheme (MCS) for transmission of PDSCH data via a user equipment (UE) in one or more resource blocks; and compensating for a difference between a cell-specific reference signal (CRS) overhead of the defined reference resource and the CRS overhead of the one or more resource blocks when selecting the MCS.

[0126] In Example 43, the wireless communication method of Example 42 may optionally include compensating for a difference between a plurality of CRS resource elements (REs) in the defined reference resource and a plurality of CRS REs in each of the one or more resource blocks.

[0127] In Example 44, the channel quality index of any one of Examples 42 to 43 may optionally indicate a first MCS, and the wireless communication method may optionally include either selecting the first MCS indicated by the channel quality index or identifying and selecting a second MCS based on a difference between the CRS overhead of the defined reference resource and the CRS overhead of the one or more resource blocks.

[0128] In Example 45, the wireless communication method of any one of Examples 42 to 44 may optionally include compensating for an enhanced physical downlink control channel (EPDCCH) implemented within the PDSCH when selecting the MCS.

[0129] In Example 46, the CRS overhead of the one or more resource blocks of any one of Examples 42 to 45 may optionally correspond to a plurality of CRS antenna ports used by the eNB.

[0130] In Example 47, the channel quality index of any one of Examples 42 to 46 may optionally include a channel quality indicator (CQI) index.

[0131] In Example 48, the reference resources defined in any one of Examples 42 to 47 may optionally include channel state information (CSI) reference resources.

[0132] Example 49 is at least one machine-readable medium comprising a set of instructions that, in response to being executed on a computing device, cause the computing device to perform a wireless communication method according to any one of Examples 42 to 48.

[0133] Example 50 is an apparatus comprising: a module for performing a wireless communication method according to any one of Examples 42 to 48.

[0134] Example 51 is an evolved node base station (eNB), comprising: a processor circuit; a communication component executed by the processor circuit, which receives a channel quality indicator (CQI) index for a physical downlink shared channel (PDSCH); a determination component executed by the processor circuit, which determines an enhanced physical downlink control channel (EPDCCH) overhead for one or more resource blocks of the PDSCH; and a selection component executed by the processor circuit, which selects a modulation and coding scheme (MCS) for transmitting a message via the one or more resource blocks based on the CQI index and the EPDCCH overhead.

[0135] In Example 52, the EPDCCH overhead of Example 51 may optionally correspond to one or more EPDCCH physical resource block (PRB) groups configured for the PDSCH.

[0136] In Example 53, the communication component of any one of Examples 51 to 52 may optionally be executed by a processor circuit to send a message via a set of resource elements (REs) in the one or more resource blocks.

[0137] In Example 54, the CQI index of any one of Examples 51 to 53 may optionally correspond to a channel state information (CSI) reference resource defined to include no EPDCCH overhead.

[0138] In Example 55, the determination component of any one of Examples 51 to 54 may optionally be executed by a processor circuit to determine a cell-specific reference signal (CRS) overhead for the one or more resource blocks, and the selection component may optionally be executed by a processor circuit to select an MCS based on a CQI index, an EPDCCH overhead, and a CRS overhead.

[0139] In Example 56, the eNB of any one of Examples 51 to 55 may optionally include a display, a radio frequency (RF) transceiver, and one or more RF antennas.

[0140] Example 57 is a wireless communication method, comprising: at an evolved node base station (eNB), receiving a channel quality indicator (CQI) index for a physical downlink shared channel (PDSCH); determining, by a processor circuit, an enhanced physical downlink control channel (EPDCCH) overhead for one or more resource blocks of the PDSCH; and selecting a modulation and coding scheme (MCS) for transmitting a message via the one or more resource blocks based on the CQI index and the EPDCCH overhead.

[0141] In Example 58, the EPDCCH overhead of Example 57 may optionally correspond to one or more EPDCCH physical resource block (PRB) groups configured for the PDSCH.

[0142] In Example 59, the wireless communication method of any one of Examples 57 to 58 may optionally include sending a message via a set of resource elements (REs) in the one or more resource blocks.

[0143] In Example 60, the CQI index of any one of Examples 57 to 59 may optionally correspond to a channel state information (CSI) reference resource defined to include no EPDCCH overhead.

[0144] In Example 61, the wireless communication method of any one of Examples 57 to 60 may optionally include: determining a cell-specific reference signal (CRS) overhead of the one or more resource blocks, and selecting an MCS based on a CQI index, an EPDCCH overhead, and a CRS overhead.

[0145] Example 62 is at least one machine-readable medium comprising a set of instructions that, in response to being executed on a computing device, causes the computing device to perform a wireless communication method according to any one of Examples 57 to 61.

[0146] Example 63 is a device comprising: a module for performing a wireless communication method according to any one of Examples 57 to 61.

[0147] Example 64 is a user equipment (UE) comprising: a processor circuit that obtains a channel quality indicator (CQI) index for a reference resource of a shared wireless downlink channel of an orthogonal frequency division multiple access (OFDMA) system, wherein the CQI index is obtained without reference to an element in the reference resource used by an enhanced downlink control channel; and a radio frequency (RF) transmitter coupled to the processor circuit, the RF transmitter transmitting an electromagnetic signal representing the CQI index on the wireless uplink channel.

[0148] In Example 65, the CQI index in Example 64 may optionally include channel state information (CSI) of a serving cell for the UE.

[0149] In Example 66, the reference resource of any one of Examples 64 to 65 may optionally include a channel state information (CSI) reference resource defined in the frequency domain by a group of downlink physical resource blocks corresponding to a frequency band to which the CQI index relates.

[0150] In Example 67, the CQI index of any one of Examples 64 to 66 may optionally be obtained using a reference resource having first three orthogonal frequency division multiplexing (OFDM) symbols occupied by a control signal.

[0151] In Example 68, the reference resource of any one of Examples 64 to 67 may optionally include a channel state information (CSI) reference resource defined in the time domain by a single downlink subframe.

[0152] In Example 69, the processor circuit of any one of Examples 64 to 68 may optionally configure channel state information (CSI) processing to report CSI including a CQI index, a precoding matrix indicator (PMI), and a rank indication (RI).

[0153] In Example 70, the shared wireless downlink channel of any one of Examples 64 to 69 may optionally include a physical downlink shared channel (PDSCH).

[0154] In Example 71, the UE of any one of Examples 64 to 70 may optionally include one or more RF antennas coupled to the RF transmitter.

[0155] In Example 72, the UE of any one of Examples 64 to 71 may optionally include a touch screen display.

[0156] Example 73 is a user equipment (UE), comprising: a processor circuit that configures channel state information (CSI) processing to report a precoding matrix indicator (PMI), a rank indication (RI), and a channel quality indicator (CQI) index of a CSI reference resource for a downlink shared channel, the processor circuit using parameters to obtain a CQI index of the CSI reference resource, wherein a cell-specific reference signal (CRS) overhead of the CSI reference resource is the same value as the CRS overhead of multiple CRS antenna ports corresponding to a serving cell of the UE.

[0157] In Example 74, the downlink shared channel of Example 73 may optionally include a physical downlink shared channel (PDSCH).

[0158] In Example 75, the CSI reference resource of any one of Examples 73 to 74 may optionally be defined in the time domain by a single downlink subframe.

[0159] In Example 76, the CSI reference resource of any one of Examples 73 to 75 may optionally be defined in the frequency domain by a set of downlink physical resource blocks corresponding to a frequency band to which the CQI index relates.

[0160] In Example 77, the processor circuit of any one of Examples 73 to 76 may optionally configure CSI processing to report CSI for a serving cell of the UE, and the CSI may optionally include a CQI index, a PMI, and a RI.

[0161] In Example 78, the processor circuit of any one of Examples 73 to 77 may optionally obtain the CQI index based on assuming that no element in the CSI reference resource is used by an enhanced physical downlink control channel (EPDCCH).

[0162] In Example 79, the UE of any one of Examples 73 to 78 may optionally include a transceiver coupled to one or more radio frequency (RF) antennas to transmit the CQI index.

[0163] In Example 80, the UE of any one of Examples 73 to 79 may optionally include a user input device.

[0164] A large number of specific details have been given here to provide a thorough understanding of the embodiments. However, those skilled in the art will appreciate that the embodiments can be practiced without these specific details. In other examples, well-known operations, components, and circuits have not been specifically described to avoid obscuring the embodiments. It can be understood that the specific structural and functional details disclosed here can be representative and do not necessarily limit the scope of the embodiments.

[0165] Certain embodiments may be described using the expressions "coupled" and "connected" and their derivatives. These terms are not intended to be synonymous with each other. For example, certain embodiments may be described using the terms "connected" and / or "coupled" to indicate that two or more elements are in direct physical or electrical contact with each other. However, the term "coupled" may also mean that two or more elements are not in direct contact with each other, but still cooperate or interact with each other.

[0166] Unless otherwise specifically stated, it is understood that terms such as "processing," "computing," "calculating," "determining," and the like refer to the actions and / or processes of a computer or computing system, or similar electronic computing device, that manipulates and / or transforms data represented as physical quantities (e.g., electronic) within registers and / or memories of the computing system into other data similarly represented as physical quantities within the computing system's memories, registers, or other such information storage, transmission, or display devices. The embodiments are not limited in this context.

[0167] It should be noted that the methods described herein do not need to be performed in the order described, or in any particular order. In addition, the various activities described with respect to the methods identified herein can be performed in a sequential or parallel manner.

[0168] Although specific embodiments have been illustrated and described herein, it should be understood that any arrangement calculated to achieve the same purpose can replace the specific embodiments shown. The present disclosure is intended to cover any and all adaptations or modifications of various embodiments. It will be understood that the above description has been made in an illustrative manner and not in a restrictive manner. After reading the above description, the combination of the above embodiments and other embodiments not specifically described here will be apparent to those skilled in the art. Thus, the scope of the various embodiments includes any other application in which the above compositions, structures, and methods are used.

[0169] It is emphasized that the abstract of the disclosure is provided to comply with 37 CFR § 1.72 (b), which requires that the abstract will allow the reader to quickly determine the nature of the technical disclosure. The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the previous detailed description, it can be seen that in a single embodiment, various features are combined together for the purpose of simplifying the disclosure. This method of disclosure is not to be interpreted as reflecting the intention that the claimed embodiment requires more features than those explicitly stated in each claim. On the contrary, as reflected in the following claims, the subject matter of the invention lies in less than all the features of a single disclosed embodiment. Therefore, the following claims are hereby incorporated into the detailed description, wherein each claim itself represents a separate preferred embodiment. In the appended claims, the terms "including" and "in which" are used as the plain English equivalents of the corresponding terms "comprising" and "wherein", respectively. In addition, the terms "first", "second", and "third" are used only as labels and are not intended to impose numerical requirements on their objects.

[0170] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A device for a base station, the device comprising: Radio interface; as well as a processor coupled to the radio interface, the processor being configured to: receiving a channel quality indicator (CQI) index, wherein the CSI index is based on a channel state information (CSI) reference resource of a downlink shared channel, and wherein first three orthogonal frequency division multiplexing (OFDM) symbols of the CSI reference resource are occupied by a control signal, selecting a modulation and coding scheme (MCS) for a physical downlink shared channel (PDSCH) based on the CQI index, and The PDSCH is caused to be transmitted over the radio interface based on the selected MCS.

2. The device according to claim 1, wherein: The processor is further configured to cause a CSI reference signal (CSI-RS) to be transmitted via the radio interface; and The CQI index is based on the CSI-RS. 3 . The apparatus according to claim 1 , wherein the CSI reference resource is defined in the frequency domain by a set of downlink physical resource blocks. 4 . The apparatus of claim 1 , wherein the CQI index is derived without reference to resource elements of the CSI reference resource allocated to an enhanced physical downlink control channel (EPDCCH).

5. The device according to claim 1, wherein: The processor is configured to receive a CSI report including the CQI index, a precoding matrix indicator (PMI), and a rank indication (RI).

6. The apparatus of claim 1, wherein the CQI index is further based on a channel state information interference measurement (CSI-IM) resource.

7. A method for a base station, the method comprising: receiving a channel quality indicator (CQI) index, wherein the CSI index is based on a channel state information (CSI) reference resource of a downlink shared channel and based on an assumption that resource elements in the CSI reference resource are not allocated to an enhanced physical downlink control channel (EPDCCH); selecting a modulation and coding scheme (MCS) for a physical downlink shared channel (PDSCH) based on the CQI index; and The PDSCH is transmitted based on the selected MCS.

8. The method of claim 7, further comprising receiving a CSI report including the CQI index, a precoding matrix indicator (PMI), and a rank indication (RI).

9. The method of claim 7, wherein first three Orthogonal Frequency Division Multiplexing (OFDM) symbols of the CSI reference resource are occupied by a control signal.

10. The method of claim 7, wherein the CSI reference resources are defined in the frequency domain by a set of downlink physical resource blocks corresponding to an orthogonal frequency division multiple access (OFDMA) frequency band associated with the CQI index.

11. A device for a base station, the device comprising: Radio interface; as well as a processor coupled to the radio interface, the processor being configured to: receiving a channel quality indicator (CQI) index from a user equipment (UE), wherein the CSI index is based on a channel state information (CSI) reference resource of a downlink shared channel, the CSI reference resource comprising a plurality of cell-specific reference signal (CRS) overhead resource elements (REs) corresponding to a plurality of CRS antenna ports of a serving cell of the UE, selecting a modulation and coding scheme (MCS) for a physical downlink shared channel (PDSCH) based on the CQI index, and The PDSCH is caused to be transmitted over the radio interface based on the selected MCS.

12. The apparatus of claim 11, wherein the CQI index is further based on an assumption that resource elements in the CSI reference resources are not allocated to an enhanced physical downlink control channel (EPDCCH).

13. The apparatus of claim 11, wherein the CQI index is further based on a CSI-interference measurement (CSI-IM) resource.

14. The apparatus of claim 11, wherein the CSI reference resource is defined in the time domain by a single downlink subframe.

15. The apparatus of claim 11, wherein the CSI reference resources are defined in the frequency domain by a set of downlink physical resource blocks corresponding to an OFDMA frequency band associated with the CQI index.

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