BRPI1006878A2 - method and equipment to enable multiple modes of transmission in a wireless communication system. - Google Patents

Abstract

METHOD AND APPARATUS TO ENABLE MULTIPLE TRANSMISSION MODES IN A WIRELESS COMMUNICATION SYSTEM Certain aspects of the present disclosure refer to a technique for enabling multiple transmission modes based on control information of different formats.

Description

«'" METHOD AND APPARATUS TO ENABLE MULTIPLE TRANSMISSION MODES IN A WIRELESS COMMUNICATION SYSTEM "

BACKGROUND Campo Ss Certain aspects of this disclosure relate to wireless communication and, more specifically, to wireless connection management. Basics Wireless communication systems are widely used to provide different types of communication content such as voice, data, and so on. These systems can be multiple access systems capable of supporting “communication with multiple users by sharing available system resources (for example, bandwidth and transmission power). Examples of such multiple access systems include code division multiple access systems (CDMA), time division multiple access systems (TDMA), frequency division multiple access systems (FDMA), Long Term Evolution systems (LTE) of 3GPP, and multiple access systems by orthogonal frequency division (OFDMA). Generally, a wireless multiple access communication system can simultaneously support communication to multiple wireless terminals. Each terminal communicates with one or more base stations through transmissions on the forward and reverse links. The direct link (or down link) refers to the communication link from the base stations to the terminals, and the reverse link (or up link) refers to the communication link from the terminals to the base stations. This communication link can be established through a single-entry and single-exit system,

multiple-entry and single-exit or multiple-entry and multiple-exit (MIMO). A MIMO system employs multiple (Nr ") transmitting antennas and multiple (Nx) receiving antennas for data transmission. A MIMO channel formed by the N, transmitting antennas and NR receiving antennas can be decomposed into Ns; independent channels, which are also referred to as spatial channels, where Ns; <€ min (Nr, Nx). Each of the Ns; independent channels correspond to a dimension. the MIMO system can provide improved performance (for example, superior transmission capacity and / or greater reliability) if the additional dimensions created by the multiple transmit and receive antennas are used.

A MIMO system supports duplex time division (TDD) and duplex frequency division (FDD) systems. In a TDD system, direct link and reverse link transmissions are in the same frequency region so that the principle of reciprocity allows the estimation of the direct link channel from the reverse link channel. This allows the access point (AP) to extract transmission beam conformation gain in the direct link when multiple antennas are available at the access point.

In a MIMO system, a wireless terminal can be configured with one of several transmission modes to enable certain features. When a wireless terminal is configured with Mode 7, it can receive downlink control (DCI) information using two possible DCI formats, that is, format 1A and format 1. It is currently proposed that each DCI format corresponds to a certain transmission scheme. Specifically, the DCI 1A format is used when using a transmission scheme for transmission diversity, and format 1 is used in a beam-forming transmission scheme.

However, each transmission scheme has its own advantages and disadvantages.

A “Mode 7” configuration designed to enable a beamform transmission scheme will improve the directionality and performance of a transmission at the expense of possible inaccuracy and channel feedback latency, while a diversity and transmission transmission scheme it can be more robust and still use faded and weak signals effectively. ; Summary Certain aspects “provide a method of enabling a transmission scheme in a wireless communication system.

The method generally includes generating downlink control (DCI) information, in which the DCI has a format selected from at least two different DCI formats, determining a value of one or more bits of the DCI to indicate a transmission scheme selected from at least two transmission schemes, and transmit the DCI to a device to indicate the selected transmission scheme. 'Certain aspects provide a device for wireless communication.

The apparatus generally includes a generator configured to generate downlink control information (DCI), in which the DCI has a format selected from at least two different DCI formats, a circuit configured to set a value of one or more bits DCI to indicate a transmission scheme selected from at least two transmission schemes, and a transmitter configured for

. 'transmit the DCI to a device to indicate the selected transmission scheme.

Certain aspects provide a device for wireless communication.

The apparatus generally includes mechanisms for generating downlink control (DCI) information, in which the DCI has a format selected from at least two different DCI formats, mechanisms for adjusting a value of one or more DCI bits to indicate a transmission scheme selected from at least two transmission schemes, and mechanisms for transmitting the DCI to a device to indicate the selected transmission scheme.

Certain aspects provide a computer program product for wireless communications comprising a computer-readable medium that has instructions stored therein, instructions being executed by one or more processors.

The instructions generally include instructions for generating downlink control information (DCI) in which the DCI has one: format selected from at least two different DCI formats, instructions for setting a value of one or more DCI bits to indicate a transmission scheme selected from at least two transmission schemes, and instructions for transmitting the DCI to a device to indicate the selected transmission scheme.

Certain aspects provide a device for wireless communication.

The device generally includes at least one processor configured to generate downlink control (DCI) information, in which the .DCI has a format selected from at least two different DCI formats, defining a value of one or more bits of the

«'DCI to indicate a transmission scheme selected from at least two transmission schemes, and transmit the DCI to a device to indicate the selected transmission scheme, and a memory coupled to at least one processor.

Certain “aspects provide a method of enabling a transmission scheme in a wireless communication system. The method generally includes receiving downlink control information (DCI), DCI having a format selected from at least two DCI formats, decoding one or more bits of the DCI to determine a transmission scheme selected from at least two transmission schemes, and transmit the data using the selected transmission scheme.

Certain aspects provide a device for wireless communication. The apparatus generally includes a receiver configured to receive downlink control (DCI) information, the DCI having a format selected from at least two DCI formats, a decoder configured to decode one or more bits of the DCI to determine a scheme transmission selected from at least two transmission schemes, and a transmitter configured to transmit data using the selected transmission scheme.

Certain aspects provide a device for wireless communications. The apparatus generally includes mechanisms for receiving downlink control (DCI) information, the DCI having a format selected from at least two DCI formats, mechanisms for decoding one or more bits of the DCI to determine a selected transmission scheme from at least two transmission schemes, and mechanisms for transmitting data using the selected transmission scheme.

'.

Certain “aspects provide a computer program product for wireless communications comprising a computer-readable medium having instructions stored on it, instructions being executed by one or more processors. The instructions generally include instructions for receiving downlink control information (DCI), the DCI having a format selected from at least two DCI formats, instructions for decoding one or more bits of the DCI to determine a selected transmission scheme from from two transmission schemes, and instructions for transmitting data using the selected transmission scheme.

Certain aspects provide a device for wireless communications. The apparatus generally includes at least one processor configured to receive downlink control (DCI) information, the DCI having a format selected from at least two DCI formats, decoding one or more bits of the DCI to determine a transmission scheme selected from at least two transmission schemes, and transmit the data using the selected transmission scheme, and a memory coupled to at least one processor.

BRIEF DESCRIPTION OF THE DRAWINGS AND IS In order that the way in which the characteristics cited above of the present invention can be understood in detail, a more specific description, briefly summarized above, can be obtained by reference to the aspects, some of which are illustrated in the attached drawings. . It should be understood, however, that the accompanying drawings illustrate only certain typical aspects of the disclosure and, therefore, should not be considered as limiting its scope, as

«'Since the description can admit other equally effective aspects.

Figure 1 illustrates an exemplary wireless communication system in accordance with certain aspects of the present disclosure.

Figure 2 illustrates a block diagram of an exemplary access point and user terminal in accordance with certain aspects of the present disclosure.

Figure 3 illustrates an exemplary operation that can be performed by user equipment in accordance with certain aspects of the present disclosure.

Figure 3A illustrates exemplary components capable of performing the operations illustrated in Figure 3.

Figures 4A-B illustrate a conventional format and an exemplary format for wireless communications in accordance with certain aspects of the present disclosure.

Figure 5A-B illustrates a conventional format and an exemplary format for wireless communication in accordance with certain aspects of the present disclosure.

Figure 6 illustrates an exemplary operation that can be performed by the access point in accordance with certain aspects of the present disclosure. i Figure 6A illustrates exemplary components capable of performing the operations illustrated in Figure 6 ...

Figure 7 illustrates an exemplary operation that can be performed by the access terminal in accordance with certain aspects of the present disclosure.

Figure 7A illustrates exemplary components capable of performing the operations illustrated in Figure 7.

Detailed Description Several aspects of the disclosure are described more fully below with reference to the accompanying drawings. This revelation, however, can be incorporated into

Claims (1)

The . many different forms and should not be considered as limited to any structure either. specific function presented from beginning to end of that revelation. More properly, these aspects are provided so that this disclosure will be thorough and complete, and will completely convey the scope of the disclosure to those skilled in the art. Based on the teachings presented here, those skilled in the art should consider that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently or in combination with any other aspect of the disclosure. For example, an apparatus can be implemented or a method can be practiced using any number of aspects presented here. In addition, the scope of the disclosure is intended to cover such apparatus or method that is practiced using another structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure presented herein. It is to be understood that any aspect of the disclosure disclosed herein may be incorporated through one or more elements of a claim. The term “exemplary” is here. used meaning "serving as an example, instances, or illustration". Any aspect described here as "exemplary" should not necessarily be considered as preferred or advantageous over other aspects. Although specific aspects are described here, many variations and permutations of these aspects are included within the scope of the disclosure. Although some benefits and advantages of the preferred aspects are mentioned, the scope of the disclosure should not be limited to the specific benefits, uses or objectives. More properly, aspects of the disclosure should be largely a. applicable to different wireless technologies, system configurations, networks, and transmission protocols, some of which are illustrated as an example in the figures and in the following description of preferred aspects. The detailed description and drawings are only illustrative of the disclosure rather than limiting the disclosure, the scope of the disclosure being defined by the appended claims and their equivalents. An Exemplary Wireless Communication System The techniques described here can be used for various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA), Orthogonal FDMA networks (OFDMA), Single Carrier FDMA networks (SC-FDMA), etc. The terms "networks" and "systems" are often used interchangeably. A CDMA network can implement radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Broadband CDMA (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers the IS-2000, IS-95 and IS-856 standards. A TDMA network can implement radio technology such as the Global System for Mobile Communication (GSM). An OFDMA network can implement radio technology such as UTRA Developed (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDMO, etc. UTRA, E-UTRA, and GSM are part of the Universal Mobile Telecommunication System (UMTS). Long Term Evolution (LTE) is an upcoming version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization called “3rd Generation Partnership Project” (3GPP). cdma2000 is described in the documents from an organization called “3rd Partnership Project 2 «. Generation ”(3GPP2). These various radio technologies and standards are known in the art. For clarity, certain aspects of the techniques are described below for LTE, and LTE terminology is used in much of the description below. Multiple access by single carrier frequency division (SC-FDMA), which uses single carrier modulation and frequency domain equalization is a multiple access technique. SC-FDMA has similar performance and essentially the same global complexity as that of an OFDMA system. SC-FDMA signal has lower peak / average energy ratio (PAPR) due to its inherent single carrier structure. SC-FDMA has attracted a lot of attention, especially in uplink communications where PAPR benefits a lot from the mobile terminal in terms of efficiency of transmission capacity. It is currently a working assumption for the 3GPP Long Term Evolution (LTE) uplink multiple access scheme, or UTRA Evolucion. With reference to Figure 1, an exemplary multiple access wireless communication system is illustrated according to a modality. An access point 100 (AP) includes multiple groups of antennas, one group including 104 and 106, another group including 108 and 110, and an additional group including 112 and 114. In Figure 1, only two antennas are shown for each group of antennas, however, a greater or lesser number of antennas can be used for each group of antennas. Access terminal 116 (AT) is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 via direct link 120 and receive information from access terminal 116 via link reverse 118. Access terminal 122 is in communication with the «. antennas 106 and 108, where antennas 106 and 108 transmit information to access terminal 122 through direct link 126 and receive information from access terminal 122 through reverse link 124. In an FDD system, communication links 118 , 120, 124 and 126 can use different frequencies on the forward link 120 than those used by the reverse link 118. Each group of antennas and / or the area in which they are designed for communication is often referred to as an access point sector. In the modality, each of the antenna groups is designed for communication with the access terminals (ATs) in a sector of the areas covered by the access point 100. When communicating through direct links 120 and 126, the transmission antennas of the access point 100 use the beam conformation to improve the signal / noise ratio of the direct links to the different access terminals 116 and 122. In addition, a point access using beam conformation for transmission to the access terminals scattered randomly across its cover causes less interference to the access terminals in neighboring cells than an access point (AT) transmitting through a single antenna to all of its terminals access. An access point can be a fixed station used to communicate with the access terminals, and it can also be referred to as an access point, a Node B, a base station, or some other terminology. An access terminal (AT) can also be called user equipment (UE), a wireless communication device, a terminal, or some other terminology. Figure 2 is a block diagram of a modality of a transmitting system 210 (also known as 12/25 And as the access point) and a receiver system 250 (also known as an access terminal). In the transmitting system 210, traffic data for a number of data streams is provided from a data source 212 to the transmission data processor (TX) 214. In one embodiment, each data stream is transmitted via transmission antenna or a group of antennas. The TX 214 data processor formats, encodes, and merges traffic data for each data stream based on a specific coding scheme selected for that data stream to provide encrypted data. The encoded data for each data stream can be multiplexed with pilot data using OFDM techniques. Pilot data is typically a known data pattern that is processed in a known manner and can be used in the receiver system to estimate the channel response. The multiplexed pilot and encoded data for each data stream is then modulated (that is, mapped into symbols) based on a specific modulation scheme (for example, BPSK, QSPK, M-PSK or M-QAM) selected for that stream data to provide modulation symbols. The data rate, encoding, and modulation for each data stream can be determined by instructions carried out by the 230 processor. The modulation symbols for all data streams are then provided to a MIMO TX 220 processor, which can further process the data. modulation symbols (for example, for OFDM). The MIMO TX 220 processor then supplies the Nr modulation symbol streams to Nf (TMTR) transmitters 222a through 222t. In certain embodiments, the MIMO TX 220 processor applies “. beam to the symbols of the data streams and to the antenna from which the symbol is being transmitted. Each transmitter 222 receives and processes a respective stream of symbols to provide one or more analog signals, and additionally conditions (for example, amplifies, filters, and converts upwards) the analog signals to provide a modulated signal suitable for transmission through the MIMO channel . The modulated signals N; from transmitters 222a to 222t they are transmitted from antennas N, 224a to 224t, respectively. In the receiver system 250, the transmitted modulated signals are received by the antennas Ngk 252a at 252r and the signal received from each antenna 252 is supplied to a respective receiver (RCVR) 254a at 254r. Each receiver 254 conditions (e.g., filters, amplifies, and downwardly converts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol stream. : An RX 260 data processor then receives and processes the received Ng symbol streams from the Nx 254 receivers based on a receiver processing technique, specific to provide the “detected” symbol streams Nr. The RX data processor 260 then demodulates, de-interleaves and decodes each detected symbol stream to retrieve traffic data for the data stream. Processing by the RX 260 data processor is complementary to that performed by the MIMO TX 220 processor and TX 214 data processor in the transmitting system 210. 2 A processor 270 periodically determines which pre-coding matrix to use (discussed below). Processor 270 formulates a reverse link message comprising a matrix index portion and a category value portion. The reverse link message can comprise various types of information regarding the communication link and / or data flow received. The reverse link message is then processed by a TX 238 data processor, which also receives traffic data for a number of data streams from a data source 236, modulated by a modulator 280, conditioned by transmitters 254a at 254r, and transmitted back to transmitter system 210. In the transmitting system 210, the signals modulated from the receiving system 250 are received by the antennas 224a-t, conditioned by the receivers 222, demodulated by a demodulator. 240, and processed by an RX data processor 242 to extract the reverse link message transmitted by the receiving system 250. Processor 230 then determines which pre-coding matrix to use to determine the beamform weights, then processes the extracted message . In one respect, logical channels are classified into Control Channels and Traffic Channels. Logical Control Channels comprise Diffusion Control Channel (BCCH), which is a DL channel for transmitting system control information. Alert Control Channel (PCCH), which is a DL channel that transfers alert information (paging). Multi-broadcast Control Channel (MCCH), which is a multi-point DL channel used to transmit Multimedia Broadcast and Multi-Broadcast Service (MBMS) programming and control information to one or more MTCHs. Generally, after setting up a Radio Resource Control (RRC) connection, this channel is used only by UEs that receive MBMS (Note: MCCH + MSCH '15/25 old). Dedicated Control Channel (DCCH), which is a bidirectional Point to Point channel that transmits dedicated control information and can be used by UEs having an RRC connection. In one aspect, the Logical Traffic Channels comprise a Dedicated Traffic Channel (DCCH), which is a point-to-point bidirectional channel dedicated to a UE for transferring user information. In addition, a Multi-Diffusion Traffic Channel (MTCH) for the point-to-multipoint DL channel for the transmission of traffic data. In one respect, the Transport Channels are classified in DL and UL. DL Transport Channels comprise a Diffusion Channel (BCH), a Downlink Shared Data Channel (DL-SDCH) and an Alert Channel (PCH), the SHP can support EU energy savings (DRX cycle can be indicated over the network to the UE), transmitted through an entire cell and mapped to PHY resources that can be used for other control / traffic channels. The UL Transport channels can comprise a Random Access Channel (RACH), a Request Channel (REQCH), an Uplink Shared Data Channel (UL-SDCH) and a plurality of PHY channels. PHY channels can comprise a set of DL channels and UL channels. DL PHY channels can comprise, for example, Common Pilot Channel (CPICH); Synchronization Channel (SCH); Common Control Channel (CCCH); Shared DL Control Channel (SD-CCH); Multi-diffusion Control Channel (MCCH); Shared UL Attribution Channel (SUACH); Confirmation Channel (ACHCH); Physical DL Shared Data Channel (DL-PSDCH); UL Energy Control Channel (UPCCH); Alert Indicator Channel (PICH); Load Indicator Channel (LICH). UL PHY channels can comprise, for example, Physical Random Access Channel (PRACH), Channel Quality Indicator Channel (CQICH); Confirmation Channel (ACKCH); Antenna Subset Indicator Channel (ASICH); '5 Shared Request Channel (SREQCH); Physical UL Shared Data Channel (UL-PSDCH) and Broadband Pilot Channel (BPICH). In one aspect, a channel structure is provided that preserves lower PAR properties (at any given time, the channel is contiguous or evenly spaced in frequency) from a single carrier waveform. : ENABLING MULTIPLE TRANSMISSION MODES USING CONTROL INFORMATION 'Certain aspects of this disclosure may enable a transmission scheme to be specified. According to certain aspects, the transmission schemes can be specified using different search spaces. For example, a UE may have to monitor a common search space and a specific UE search space. The UE can be consciously configured to use a specific transmission mode (for example, mode 7) and use beam conformation, most of the time. As a result, according to certain aspects, if a UE receives DL control information (DCI) in the common search space, it will be sent using transmission diversity. Otherwise, DCI can be sent using beam forming. In . According to certain aspects, a transmission scheme can be indicated explicitly when transmitting downlink control (DCI) information in certain formats. According to certain aspects, one or more bits of conventional DCI formats can be used to specify a transmission scheme to be used by a receiving entity. The supported transmission scheme can be, for example, either transmission diversity or beam conformation. The transmission diversity scheme can be used to obtain robustness, as well as for a withdrawal operation. If two or more DCI formats are associated with the same UE, only one DCI format can comprise the explicit indication about the transmission scheme. Other DCI formats can remain unchanged and can be used only to indicate the beamform transmission scheme. . Figure 3 illustrates exemplary operations that can be performed, for example, by an access terminal, to indicate a transmission scheme when transmitting DCI in different search spaces. Operations start in 302, by monitoring a plurality of search spaces. A search space is a region that includes several resource elements (REs) and common control elements (CCEsS). A search space can be classified as a common search space and a search space for a specific access terminal (or specific UE). A common search space can be monitored by all access terminals in an area. A search space for a specific access terminal can be monitored by at least one access terminal. The common search space and the search space of a specific access terminal can overlap each other. In one embodiment, an access terminal may have to monitor both the common search space and the search space for a specific access terminal. In 304, the AT receives control information (CI) in one of the plurality of search spaces. An access terminal can use the CI to carry downlink or uplink programming information. In one embodiment, an access terminal can receive Downlink Control Information (DCI) through a Downlink Control Physical Channel (PDCCH). At 306, an access terminal can transmit data using a transmission scheme based on the search space in which the CI was received. In one embodiment, an access terminal can be configured to use a beamform transmission scheme as a standard transmission scheme. The access terminal can transmit data using the transmission diversity transmission scheme if the access terminal receives CI and a common search space. If the access terminal receives the CI in another search space, such as in a specific access terminal search space, the access terminal can resume data transmission using the beam-forming transmission scheme. In one embodiment of the disclosure disclosed herein, a method for enabling different transmission schemes may comprise the reinterpretation of at least one or more values in a CI format to indicate a transmission scheme. Figure 4A and Figure 5A illustrate formats for downlink control (DCI) information. In one embodiment, a format for control information may be suitable for use in assignments of a downlink shared channel resource when no spatial multiplexing is used. In another embodiment, a suitable format can be a compact format used for assigning a downlink shared channel resource when no spatial multiplexing is used. In the illustrated mode, formats for control information can be Format 1A and 1 of downlink control information, as shown in Figures 4A and 5A, respectively. Referring to Figure 4A, in a disclosure embodiment, DCI Format 1A may comprise several fields of information suitable for indicating a transmission scheme. In one modality, the Indicator of Attribution of Block of Virtual Resources (VRB) Located / Distributed, marked in 402, can be used. In one embodiment, the VRB Assigned / Distributed Indicator can be set to a first value to indicate a transmission scheme by transmission diversity. Similarly, the Attribution indicator. of Localized / Distributed VRB can be adjusted to a second value to indicate a beam conformation transmission scheme. In one embodiment, the first value can be equal to zero, while the second value can be equal to a defined value other than zero. It is considered that the reinterpretation of an information field in a DCI format can lead to a loss of flexibility in resources. In one embodiment, the reinterpretation of the Localized / Distributed VRB Assignment indicator for use in indicating a transmission schema may lose the flexibility to indicate dynamic switching between allocations of localized and distributed VRB resources. However, such switching can still be done using, in one embodiment, a semi-static approach using upper layer signaling. In another embodiment, a fixed VRB scheme, using localized or distributed VRB, can be specified. Figure 4B illustrates a modified DCI format, in accordance with aspects of the present disclosure. In one embodiment, a modified DCI 1A format may comprise a 1l1-bit indicator to indicate a transmission scheme, marked 404, instead of the Localized / Distributed VRB Assignment indicator. Referring to Figure 5A, in a disclosure embodiment, DCI Format 1 may comprise several fields of information suitable for indicating a transmission scheme. In one embodiment, the 502A Modulation and Encoding Scheme information field, comprising 5 bits, can be used. Referring to Figure 5B, in one embodiment, the Modulation and Encoding Scheme information field can be separated into a 502B Modulation and Encoding Scheme information field, now comprising 4 bits, and a 504 Transmission Scheme indicator, comprising 1 bit. The Transmission Scheme indicator 504 can be adjusted to a first value to indicate a Transmission Scheme for transmission diversity, and can be adjusted to a second value to indicate a Transmission Scheme by beam conformation. It is considered that another information field in a DCI format can be used to indicate a transmission scheme. It is also considered that the reinterpreted information field may comprise one or more bits. It is also considered that several values can be used to indicate at least one transmission scheme and other information related to the transmission scheme. Figure 6 illustrates an exemplary operation that can be performed by an access point to enable multiple transmission modes. The illustrated operations can be performed using any suitable components, such as the APs described above with reference to Figures 1-2. Operation 600 begins, in 602, by generating downlink control information (DCI), in which the DCI has a format selected from at least two DCI formats. In one embodiment, as described and illustrated in Figures 4A-B and S5A-B, the format can be selected from at least DCI Format 1 and DCI Format 1A. It is considered that other DCI formats, such as DCI Format O or DCI Format 2, may be suitable. At 604, an access point can set a value of 1 or more DCI bits to indicate a transmission scheme, the transmission scheme selected from at least two transmission schemes. In one embodiment, the transmission schemes available for selection are transmission diversity and beam conformation. At 606, an access point can transmit DCI to an element, such as another access point or an access terminal, to indicate the selected transmission scheme. Figure 7 illustrates an exemplary operation that can be performed by the access terminal to enable multiple transmission modes. The illustrated operations can be performed by any components: suitable, such as the ATs described above with reference to Figures 1-2. Operation 700 begins, in 702, upon receipt from DCI, DCI having a format selected from at least two DCI formats. In one embodiment, the format can be selected from at least DCI format 1 and DCI format 1A. In 704, an access terminal can decode one or more bits of the DCI to determine a transmission scheme selected from at least two transmission schemes. As described above, in one embodiment, transmission schemes may comprise beam conformation and transmission diversity. In one embodiment, a non-null value of one or more bits related to the DCI Localized / Distributed VRB Resource Indicator in a DCI Format 1A, as shown in Figure 4A-B, can indicate a beamform transmission scheme . Conversely, in a modality, a null value in one or more bits related to the Localized / Distributed VRB Resource Indicator - can indicate a transmission scheme for transmission diversity. It is understood that the specific order or hierarchy of steps in the revealed processes is an example of exemplary approaches. Based on the model preferences, it is understood that the specific order or hierarchy of steps in the processes can be rearranged while remaining within the scope of the present disclosure. The attached claims of the method present elements present from the various stages in an exemplary order, and are not intended to be limited to the specific order or hierarchy presented. Those skilled in the art would understand that information and signals can be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, particles or magnetic fields, particles or optical fields, or any combination thereof. Those skilled in the art would further recognize that the various illustrative logic blocks, modules, circuits and algorithm steps described with respect to the modalities disclosed herein can be implemented as. electronic hardware, computer software, or combinations of both. To clearly illustrate this ability to exchange hardware and software, several illustrative components, blocks, modules, circuits and steps have been described above generically in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and design limitations imposed on the general system. Those skilled in the art can implement the described functionality in a variety of ways for each specific application, however such implementation decisions should not be interpreted as departing from the scope of the present disclosure. The various illustrative logic blocks, modules and circuits described in connection with the modalities disclosed here can be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an arrangement field programmable ports (FPGA), or other programmable logic device, discrete port or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described here. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller or state machine. A processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other configuration. The steps of a method or algorithm described in connection with the modalities disclosed here can be incorporated directly into hardware, a software module executed by a processor or a combination of the two. A software module can reside in RAM, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor in such a way that the processor can read information from, and write information to, the storage medium. Alternatively, the storage medium can be integrated with the processor. The processor e. the storage medium can reside in an ASIC. The ASIC can reside on a user terminal. Alternatively, the processor and the storage medium can reside as discrete components in a user terminal. The foregoing description of the revealed aspects is provided to enable anyone skilled in the art to make or use the present disclosure. Various changes in these aspects will be readily apparent to those skilled in the art, and the generic principles defined here can be applied to other aspects without departing from the spirit or scope of the revelation. Thus,. the present disclosure is not intended to be limited to the modalities described here, but the broadest scope compatible with the principles, and characteristics, novices disclosed herein should be given. Although the precedent is directed to the modalities of the present disclosure, other additional modalities and modalities of the disclosure can be conceived without departing from its basic scope, and its scope is determined by the following claims.