FreshPatents.com Logo
stats FreshPatents Stats
n/a views for this patent on FreshPatents.com
Updated: December 09 2014
Browse: Qualcomm patents
newTOP 200 Companies filing patents this week


Advertise Here
Promote your product, service and ideas.

    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

Your Message Here

Follow us on Twitter
twitter icon@FreshPatents

Method and apparatus that facilitates detecting system information blocks in a heterogeneous network

last patentdownload pdfdownload imgimage previewnext patent

20140036838 patent thumbnailZoom

Method and apparatus that facilitates detecting system information blocks in a heterogeneous network


Aspects are disclosed for detecting a system information block (SIB) within a heterogeneous network. In one aspect, a type of scheduling information pertaining to an SIB is selected, and a parameter known to a wireless terminal is associated with the type of scheduling information. The wireless terminal then decodes the SIB by deriving the scheduling information from the known parameters, without having to decode a Physical Downlink Control Channel.
Related Terms: Physical Downlink Control Channel Downlink Control Channel Heterogeneous Network Codes Downlink Heterogeneous Scheduling Wireless

Qualcomm Incorporated - Browse recent Qualcomm patents - San Diego, CA, US
USPTO Applicaton #: #20140036838 - Class: 370329 (USPTO) -
Multiplex Communications > Communication Over Free Space >Having A Plurality Of Contiguous Regions Served By Respective Fixed Stations >Channel Assignment



Inventors: Taesang Yoo, Tao Luo, Kibeom Seong

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20140036838, Method and apparatus that facilitates detecting system information blocks in a heterogeneous network.

last patentpdficondownload pdfimage previewnext patent

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. Ser. No. 12/860,747, filed Aug. 20, 2010, entitled “METHOD AND APPARATUS THAT FACILITATES DETECTING SYSTEM INFORMATION BLOCKS IN A HETEROGENEOUS NETWORK,” which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/236,254, filed Aug. 24, 2009, entitled “A METHOD AND APPARATUS FOR SYSTEM INFORMATION BLOCK TYPE DETECTION IN HETEROGENEOUS NETWORK.” The aforementioned applications are herein incorporated by reference in their entirety.

BACKGROUND

I. Field

The following description relates generally to wireless communications, and more particularly to detecting system information blocks in heterogeneous networks.

II. Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, 3GPP Long Term Evolution (LTE) systems, and orthogonal frequency division multiple access (OFDMA) systems.

Generally, a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals. Each terminal communicates with one or more base stations via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the base stations to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the base stations. This communication link may be established via a single-in-single-out, multiple-in-signal-out or a multiple-in-multiple-out (MIMO) system.

A MIMO system employs multiple (NT) transmit antennas and multiple (NR) receive antennas for data transmission. A MIMO channel formed by the NT transmit and NR receive antennas may be decomposed into NS independent channels, which are also referred to as spatial channels, where NS≦min{NT, NR}. Each of the NS independent channels corresponds to a dimension. The MIMO system can provide improved performance (e.g., higher throughput and/or greater reliability) if the additional dimensionalities created by the multiple transmit and receive antennas are utilized.

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

With respect to system information block transmissions, it is noted that decoding such transmissions has become increasingly more difficult with the expansion of heterogeneous networks (i.e., networks having macro cells, femto cells, and/or pico cells). Namely, wireless terminals within a heterogeneous network may experience interference from multiple base stations transmitting their respective system information blocks. Accordingly, methods and apparatuses which mitigate such interference are desirable.

The above-described deficiencies of current wireless communication systems are merely intended to provide an overview of some of the problems of conventional systems, and are not intended to be exhaustive. Other problems with conventional systems and corresponding benefits of the various non-limiting embodiments described herein may become further apparent upon review of the following description.

SUMMARY

The following presents a simplified summary of one or more embodiments in order to provide a basic understanding of such embodiments. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify key or critical elements of all embodiments nor delineate the scope of any or all embodiments. Its sole purpose is to present some concepts of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later.

In accordance with one or more embodiments and corresponding disclosure thereof, various aspects are described in connection with detecting system information blocks in heterogeneous networks. In one aspect, methods and computer program products are disclosed that facilitate detecting a system information block. These embodiments include selecting a type of scheduling information pertaining to the system information block, and associating a known parameter with the type of scheduling information. For these embodiments, a decoding of the system information block is facilitated by an association of the known parameter with the type of scheduling information independent of a Physical Downlink Control Channel transmission. The system information block is then transmitted to a wireless terminal.

In another aspect, an apparatus configured to facilitate detecting a system information block is disclosed. Within such embodiment, the apparatus includes a processor configured to execute computer executable components stored in memory. The computer executable components include a scheduling component, an association component, and a communication component. The scheduling component is configured to select a type of scheduling information pertaining to the system information block, whereas the association component is configured to associate a known parameter with the type of scheduling information. For this embodiment, a decoding of the system information block is also facilitated by an association of the known parameter with the type of scheduling information independent of a Physical Downlink Control Channel transmission. The communication component is then configured to transmit the system information block to a wireless terminal.

In a further aspect, another apparatus is disclosed. Within such embodiment, the apparatus includes means for selecting, means for associating, and means for transmitting. For this embodiment, the means for selecting selects a type of scheduling information pertaining to the system information block, whereas the means for associating associates a known parameter with the type of scheduling information. For this embodiment, a decoding of the system information block is again facilitated by an association of the known parameter with the type of scheduling information independent of a Physical Downlink Control Channel transmission. The means for transmitting then transmits the system information block to a wireless terminal.

In another aspect, methods and computer program products are disclosed that facilitate detecting a system information block. These embodiments include receiving a transmission of the system information block, and deriving a type of scheduling information associated with the transmission from at least one known parameter. Furthermore, these embodiments include decoding the system information block based on the type of scheduling information. Here, it should be noted that the decoding is performed independent of a Physical Downlink Control Channel transmission.

In another aspect, an apparatus configured to facilitate detecting a system information block is disclosed. Within such embodiment, the apparatus includes a processor configured to execute computer executable components stored in memory. The computer executable components include a communication component, a derivation component, and a decoding component. The communication component is configured to receive a transmission of the system information block, whereas the derivation component is configured to derive scheduling information associated with the transmission from at least one known parameter. The decoding component is then configured to perform a decoding of the system information block based on the type of scheduling information. For this particular embodiment, the decoding is also performed independent of a Physical Downlink Control Channel transmission.

In a further aspect, another apparatus is disclosed. Within such embodiment, the apparatus includes means for receiving, means for deriving, and means for decoding. For this embodiment, the means for receiving receives a transmission of the system information block, whereas the means for deriving derives scheduling information associated with the transmission from at least one known parameter. For this embodiment, the means for decoding then decodes the system information block based on the constraint and the scheduling information. Here, the system information block is again decoded independent of a Physical Downlink Control Channel transmission.

To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more embodiments. These aspects are indicative, however, of but a few of the various ways in which the principles of various embodiments can be employed and the described embodiments are intended to include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a wireless communication system in accordance with various aspects set forth herein.

FIG. 2 is an illustration of an exemplary wireless network environment that can be employed in conjunction with the various systems and methods described herein.

FIG. 3 is an illustration of an exemplary heterogeneous system that facilitates detecting system information blocks according to an embodiment.

FIG. 4 illustrates a block diagram of an exemplary network entity that facilitates detecting system information blocks in accordance with an aspect of the subject specification.

FIG. 5 is an illustration of a first exemplary coupling of electrical components that effectuate detecting system information blocks.

FIG. 6 is a first flow chart illustrating an exemplary methodology that facilitates detecting system information blocks in accordance with an aspect of the subject specification.

FIG. 7 illustrates a block diagram of an exemplary wireless terminal that facilitates detecting system information blocks in accordance with an aspect of the subject specification.

FIG. 8 is an illustration of a second exemplary coupling of electrical components that effectuate detecting system information blocks.

FIG. 9 is a second flow chart illustrating an exemplary methodology that facilitates detecting system information blocks in accordance with an aspect of the subject specification.

FIG. 10 is an illustration of an exemplary communication system implemented in accordance with various aspects including multiple cells.

FIG. 11 is an illustration of an exemplary base station in accordance with various aspects described herein.

FIG. 12 is an illustration of an exemplary wireless terminal implemented in accordance with various aspects described herein.

DETAILED DESCRIPTION

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

The subject specification is directed towards detecting system information blocks in heterogeneous networks. Exemplary embodiments are disclosed for mitigating interference associated with system information block transmissions within heterogeneous networks. Various interference mitigation schemes are disclosed including, for example, a scheme independent of a Physical Downlink Control Channel transmission which associates scheduling information with parameters known to wireless terminals, as well as a scheduling scheme which schedules system information block transmissions based on scheduling information pertaining to interfering system information block transmissions.

To this end, it is noted that the techniques described herein can be used for various wireless communication systems such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier-frequency division multiple access (SC-FDMA), High Speed Packet Access (HSPA), and other systems. The terms “system” and “network” are often used interchangeably. A CDMA system can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA system can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA system can implement a radio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink.

Single carrier frequency division multiple access (SC-FDMA) utilizes single carrier modulation and frequency domain equalization. SC-FDMA has similar performance and essentially the same overall complexity as those of an OFDMA system. A SC-FDMA signal has lower peak-to-average power ratio (PAPR) because of its inherent single carrier structure. SC-FDMA can be used, for instance, in uplink communications where lower PAPR greatly benefits access terminals in terms of transmit power efficiency. Accordingly, SC-FDMA can be implemented as an uplink multiple access scheme in 3GPP Long Term Evolution (LTE) or Evolved UTRA.

High speed packet access (HSPA) can include high speed downlink packet access (HSDPA) technology and high speed uplink packet access (HSUPA) or enhanced uplink (EUL) technology and can also include HSPA+ technology. HSDPA, HSUPA and HSPA+ are part of the Third Generation Partnership Project (3GPP) specifications Release 5, Release 6, and Release 7, respectively.

High speed downlink packet access (HSDPA) optimizes data transmission from the network to the user equipment (UE). As used herein, transmission from the network to the user equipment UE can be referred to as the “downlink” (DL). Transmission methods can allow data rates of several Mbits/s. High speed downlink packet access (HSDPA) can increase the capacity of mobile radio networks. High speed uplink packet access (HSUPA) can optimize data transmission from the terminal to the network. As used herein, transmissions from the terminal to the network can be referred to as the “uplink” (UL). Uplink data transmission methods can allow data rates of several Mbit/s. HSPA+ provides even further improvements both in the uplink and downlink as specified in Release 7 of the 3GPP specification. High speed packet access (HSPA) methods typically allow for faster interactions between the downlink and the uplink in data services transmitting large volumes of data, for instance Voice over IP (VoIP), videoconferencing and mobile office applications

Fast data transmission protocols such as hybrid automatic repeat request, (HARQ) can be used on the uplink and downlink. Such protocols, such as hybrid automatic repeat request (HARQ), allow a recipient to automatically request retransmission of a packet that might have been received in error.

Various embodiments are described herein in connection with an access terminal. An access terminal can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, user device, or user equipment (UE). An access terminal can be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having wireless connection capability, computing device, or other processing device connected to a wireless modem. Moreover, various embodiments are described herein in connection with a base station. A base station can be utilized for communicating with access terminal(s) and can also be referred to as an access point, Node B, Evolved Node B (eNodeB), access point base station, or some other terminology.

Referring now to FIG. 1, a wireless communication system 100 is illustrated in accordance with various embodiments presented herein. System 100 comprises a base station 102 that can include multiple antenna groups. For example, one antenna group can include antennas 104 and 106, another group can comprise antennas 108 and 110, and an additional group can include antennas 112 and 114. Two antennas are illustrated for each antenna group; however, more or fewer antennas can be utilized for each group. Base station 102 can additionally include a transmitter chain and a receiver chain, each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.

Base station 102 can communicate with one or more access terminals such as access terminal 116 and access terminal 122; however, it is to be appreciated that base station 102 can communicate with substantially any number of access terminals similar to access terminals 116 and 122. Access terminals 116 and 122 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100. As depicted, access terminal 116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 over a forward link 118 and receive information from access terminal 116 over a reverse link 120. Moreover, access terminal 122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to access terminal 122 over a forward link 124 and receive information from access terminal 122 over a reverse link 126. In a frequency division duplex (FDD) system, forward link 118 can utilize a different frequency band than that used by reverse link 120, and forward link 124 can employ a different frequency band than that employed by reverse link 126, for example. Further, in a time division duplex (TDD) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.

Each group of antennas and/or the area in which they are designated to communicate can be referred to as a sector of base station 102. For example, antenna groups can be designed to communicate to access terminals in a sector of the areas covered by base station 102. In communication over forward links 118 and 124, the transmitting antennas of base station 102 can utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124 for access terminals 116 and 122. Also, while base station 102 utilizes beamforming to transmit to access terminals 116 and 122 scattered randomly through an associated coverage, access terminals in neighboring cells can be subject to less interference as compared to a base station transmitting through a single antenna to all its access terminals.

FIG. 2 shows an example wireless communication system 200. The wireless communication system 200 depicts one base station 210 and one access terminal 250 for sake of brevity. However, it is to be appreciated that system 200 can include more than one base station and/or more than one access terminal, wherein additional base stations and/or access terminals can be substantially similar or different from example base station 210 and access terminal 250 described below. In addition, it is to be appreciated that base station 210 and/or access terminal 250 can employ the systems and/or methods described herein to facilitate wireless communication there between.

At base station 210, traffic data for a number of data streams is provided from a data source 212 to a transmit (TX) data processor 214. According to an example, each data stream can be transmitted over a respective antenna. TX data processor 214 formats, codes, and interleaves the traffic data stream based on a particular coding scheme selected for that data stream to provide coded data.

The coded data for each data stream can be multiplexed with pilot data using orthogonal frequency division multiplexing (OFDM) techniques. Additionally or alternatively, the pilot symbols can be frequency division multiplexed (FDM), time division multiplexed (TDM), or code division multiplexed (CDM). The pilot data is typically a known data pattern that is processed in a known manner and can be used at access terminal 250 to estimate channel response. The multiplexed pilot and coded data for each data stream can be modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected for that data stream to provide modulation symbols. The data rate, coding, and modulation for each data stream can be determined by instructions performed or provided by processor 230.

The modulation symbols for the data streams can be provided to a TX MIMO processor 220, which can further process the modulation symbols (e.g., for OFDM). TX MIMO processor 220 then provides NT modulation symbol streams to NT transmitters (TMTR) 222a through 222t. In various embodiments, TX MIMO processor 220 applies beamforming weights 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 symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. Further, NT modulated signals from transmitters 222a through 222t are transmitted from NT antennas 224a through 224t, respectively.

At access terminal 250, the transmitted modulated signals are received by NR antennas 252a through 252r and the received signal from each antenna 252 is provided to a respective receiver (RCVR) 254a through 254r. Each receiver 254 conditions (e.g., filters, amplifies, and downconverts) a respective signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.

An RX data processor 260 can receive and process the NR received symbol streams from NR receivers 254 based on a particular receiver processing technique to provide NT “detected” symbol streams. RX data processor 260 can demodulate, deinterleave, and decode each detected symbol stream to recover the traffic data for the data stream. The processing by RX data processor 260 is complementary to that performed by TX MIMO processor 220 and TX data processor 214 at base station 210.

A processor 270 can periodically determine which available technology to utilize as discussed above. Further, processor 270 can formulate a reverse link message comprising a matrix index portion and a rank value portion.

The reverse link message can comprise various types of information regarding the communication link and/or the received data stream. The reverse link message can be processed by a TX data processor 238, 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 through 254r, and transmitted back to base station 210.

At base station 210, the modulated signals from access terminal 250 are received by antennas 224, conditioned by receivers 222, demodulated by a demodulator 240, and processed by a RX data processor 242 to extract the reverse link message transmitted by access terminal 250. Further, processor 230 can process the extracted message to determine which precoding matrix to use for determining the beamforming weights.

Processors 230 and 270 can direct (e.g., control, coordinate, manage, etc.) operation at base station 210 and access terminal 250, respectively. Respective processors 230 and 270 can be associated with memory 232 and 272 that store program codes and data. Processors 230 and 270 can also perform computations to derive frequency and impulse response estimates for the uplink and downlink, respectively.

Referring next to FIG. 3, an exemplary system is illustrated that facilitates detecting system information blocks in accordance with aspects described herein. As illustrated, system 300 includes base station 310, base station 320, and wireless terminal 330. In an aspect, it is contemplated that system 300 is a heterogeneous network, wherein base station 310 is a macro evolved node B (eNB), and wherein base station 320 is an access point base station associated with a femto/pico cell. Within such embodiment, wireless terminal experiences interference upon receiving both system information block 312 from base station 310 and system information block 322 from base station 320. To mitigate such interference, various interference mitigation schemes are disclosed.

For instance, an interference mitigation scheme is disclosed which allows wireless terminals to decode system information blocks without having to decode a Physical Downlink Control Channel (PDCCH) transmission. To this end, it is noted that, for legacy wireless terminals, the wireless terminal needs to decode PDCCH to obtain scheduling information (e.g., resource block allocation, modulation and coding scheme (MCS), etc) necessary for decoding a system information block. Since it may be challenging for a wireless terminal to decode PDCCH under strong interference, an embodiment directed towards a PDCCH-less operation is disclosed which allows wireless terminals to obtain scheduling information without decoding PDCCH. Moreover, aspects are disclosed in which the network provides scheduling information pertaining to system information block transmissions on known resource block locations, which the wireless terminal can derive from a cell identifier, system frame number, or other known parameters. Other scheduling information, such as MCS, may not be explicitly known to the wireless terminal, in which case the wireless terminal can rely on blind decoding. Therefore, a wireless terminal can derive all the scheduling information necessary for system information block decoding by either explicitly deriving known parameters or relying on blind decoding which associates scheduling information with parameters known to wireless terminals, as well as a scheduling scheme which schedules system information block transmissions based on scheduling information pertaining to interfering system information block transmissions.

Here, it is noted that PDCCH may still be transmitted for backward compatibility, so that legacy wireless terminals, which are unaware of PDCCH-less operation, can obtain scheduling information for system information block transmissions via decoding PDCCH. However, for non-legacy wireless terminals (e.g., LTE Release-9+), it would be redundant to decode PDCCH for system information block transmissions.

In another aspect, scheduling embodiments are disclosed in which base stations coordinate system information block scheduling to enable wireless terminals to perform system information block decoding under strong interference. One approach is for base stations to orthogonalize system information block transmissions, i.e. base stations schedule their system information blocks on different resource block locations, and they do not schedule (or at least power down) any other Physical Downlink Shared Channels (PDSCHs) on neighboring base stations\' system information block resource block locations. Another approach is for base stations to schedule their system information blocks on the same resource block locations. In this case, a wireless terminal may first decode a system information block from the strong interferer, cancel out its contents, and then decode a system information block from the weaker serving cell. A hybrid approach is also possible, wherein the system information blocks may or may not collide. In which case, the wireless terminal can apply interference cancellation techniques when the system information blocks collide. Here, it should be noted that wireless terminals may distinguish collision cases from orthogonalization cases via known system parameters such as a system frame number, cell identifier, etc.

Referring next to FIG. 4, an exemplary network entity that facilitates detecting a system information block within a heterogeneous network according to an embodiment is illustrated. As shown, network entity 400 may include processor component 410, memory component 420, scheduling component 430, association component 440, and communication component 450. Here, it should be appreciated that network entity 400 may reside within any of a plurality of network entities including, for example, an evolved node B (eNB).

In one aspect, processor component 410 is configured to execute computer-readable instructions related to performing any of a plurality of functions. Processor component 410 can be a single processor or a plurality of processors which analyze information to be communicated from network entity 400 and/or generate information that is utilized by memory component 420, scheduling component 430, association component 440, and/or communication component 450. Additionally or alternatively, processor component 410 may be configured to control one or more components of network entity 400.

In another aspect, memory component 420 is coupled to processor component 410 and configured to store computer-readable instructions executed by processor component 410. Memory component 420 may also be configured to store any of a plurality of other types of data including generated by any of scheduling component 430, association component 440, and/or communication component 450. Memory component 420 can be configured in a number of different configurations, including as random access memory, battery-backed memory, hard disk, magnetic tape, etc. Various features can also be implemented upon memory component 420, such as compression and automatic back up (e.g., use of a Redundant Array of Independent Drives configuration).

As illustrated, network entity 400 may further include scheduling component 430. Within such embodiment, scheduling component 430 may be configured to select a type of scheduling information pertaining to a system information block. In an aspect, it is contemplated that such system information block may be any of a plurality of types of system information blocks including, for example, a type one system information block (SIB1) or a type two system information block (SIB2). Furthermore, it should be noted that the type of scheduling information pertaining to the system information block may vary. For instance, such scheduling information may include a resource block allocation and/or a modulation and coding scheme (MCS). In a particular embodiment, scheduling component 430 is configured to limit a possible number of modulation and coding scheme choices. Within such embodiment, a reduction of blind decode operations performed by a wireless terminal is facilitated by the limit.

In another aspect, network entity 400 includes association component 440, which is configured to associate a parameter known by a wireless terminal with the type of scheduling information selected by scheduling component 430. Here, it should again be noted that such parameter can be any of a plurality of parameters known by wireless terminals independent of a Physical Downlink Control Channel transmission. For instance, the known parameter can be a system frame number or a cell identifier. Accordingly, by associating the known parameter with the type of scheduling information, it is contemplated that a wireless terminal may decode a system information block independent of a Physical Downlink Control Channel transmission.

In yet another aspect, network entity 400 includes communication component 450, which is coupled to processor component 410 and configured to interface network entity 400 with external entities. For instance, communication component 450 may be configured to transmit the system information block to a wireless terminal. In a particular embodiment, communication component 450 is configured to communicate the system information block to a plurality of wireless terminals via a plurality of redundancy versions (RVs). Here, it is contemplated that a first subset of the plurality of RVs is associated with legacy wireless terminals, whereas a second subset of the plurality of RVs is associated with non-legacy wireless terminals. Within such embodiment, communication component 450 is configured to provide the second subset of the plurality of RVs according to a subset of the scheduling information derived from the known parameter, wherein the known parameter is known by at least one of the non-legacy wireless terminals.

In other aspects, network entity 400 may be configured to mitigate interference by utilizing scheduling information associated with neighboring nodes. For instance, communication component 450 may be configured to ascertain scheduling information associated with an interfering system information block transmission, wherein the interfering system information block transmission is scheduled to be transmitted from an interfering base station. Scheduling component 430 may then be configured to schedule a system information block transmission (e.g., an SIB1 transmission, an SIB2 transmission, etc.) based on the scheduling information associated with the interfering system information block transmission.

To this end, it should be noted that scheduling component 430 may be configured to schedule system information block transmissions in any of a plurality of ways. For instance, in an aspect, scheduling component 430 is configured to orthogonalize such transmissions with the interfering system information block transmission. In a particular embodiment, such orthogonalization is performed in the frequency domain, wherein scheduling component 430 is configured to utilize a non-overlapping resource block allocation.

In another aspect, scheduling component 430 is configured to collide system information block transmissions with the interfering system information block transmission. For instance, scheduling component 430 may be configured to utilize an identical resource block allocation to collide system information block transmissions with the interfering system information block transmission. In a particular embodiment, base station 400 may be configured to synchronize its system frame number with interfering system frame numbers and scheduling component 430 may then be configured to derive the resource block allocation from a synchronized system frame number, thereby achieving colliding system information block transmissions.

It is also contemplated that system information block transmissions may partly collide with interfering system information block transmissions. For instance, scheduling component 430 may be configured to collide a first transmission of the system information block with a first interfering system information block transmission, to orthogonalize a second transmission of the system information block with a second interfering system information block transmission, and to partially collide a third transmission of the system information block with a third interfering system information block transmission. In an aspect, scheduling component 430 may be further configured to derive a resource block allocation according to a particular parameter known by wireless terminals. For example, such resource block allocation may be derived from a system frame number and/or a cell identifier.

Turning to FIG. 5, illustrated is a system 500 that facilitates detecting a system information block according to an embodiment. System 500 and/or instructions for implementing system 500 can reside within a base station (e.g., network entity 400). As depicted, system 500 includes functional blocks that can represent functions implemented by a processor using instructions and/or data from a computer readable storage medium. System 500 includes a logical grouping 502 of electrical components that can act in conjunction. As illustrated, logical grouping 502 can include an electrical component for selecting a type of scheduling information pertaining to the system information block 510. Furthermore, logical grouping 502 can include an electrical component for associating a known parameter with the type of scheduling information 512. Logical grouping 502 can also include an electrical component for transmitting the system information block to a wireless terminal 514. Additionally, system 500 can include a memory 520 that retains instructions for executing functions associated with electrical components 510, 512, and 514. While shown as being external to memory 520, it is to be understood that electrical components 510, 512, and 514 can exist within memory 520.

Referring next to FIG. 6, a flow chart illustrating an exemplary method that facilitates detecting system information blocks in heterogeneous networks is provided. As illustrated, process 600 includes a series of acts that may be performed within a base station (e.g., network entity 400) according to an aspect of the subject specification. For instance, process 600 may be implemented by employing a processor to execute computer executable instructions stored on a computer readable storage medium to implement the series of acts. In another embodiment, a computer-readable storage medium comprising code for causing at least one computer to implement the acts of process 600 are contemplated.

In an aspect, process 600 begins with a communication with a wireless terminal being established at act 610. At act 620, process 600 continues with the selection of a particular interference mitigation scheme. As mentioned previously, it is contemplated that any of a plurality of interference mitigation schemes may be implemented (e.g., orthogonal scheduling, colliding scheduling, partly colliding scheduling, etc.), wherein a PDCCH-less scheme may be used to associate scheduling information with parameters known to wireless terminals. When PDCCH-less scheme is used, the selection of modulation and coding scheme may be constrained to reduce the number of blind decodes at the wireless terminal.

Once the interference mitigation scheme has been selected, process 600 then proceeds to act 630 to select a type of scheduling information (e.g. a modulation and coding scheme (MCS)) directed towards a system information block transmission, wherein the choice of MCS may be optionally constrained. Process 600 then proceeds to act 640 where other scheduling information (e.g., resource block allocation) is determined by associating them with a parameter known to wireless terminals. A system information block transmission is then scheduled at act 650 according to the determined scheduling information, and subsequently transmitted to a wireless terminal at act 660.

Here, it should be noted that, depending on how the resource block allocation is determined, any of various types of scheduling schemes may be implemented including, for example, an orthogonal scheduling, a colliding scheduling, and/or a partly colliding scheduling. For example, if all base stations derive the resource block allocation from a system frame number, and if the system frame number is synchronized across base stations, then all the system information block transmissions will be colliding. On the other hand, if each base station derives the resource block allocation based on some function of its cell identifier, then a fully colliding, orthogonal, and/or partly colliding transmissions may be achieved, depending on the nature of the function used.

Referring next to FIG. 7, a block diagram illustrates an exemplary wireless terminal that facilitates detecting a system information block in accordance with various aspects. As illustrated, wireless terminal 700 may include processor component 710, memory component 720, communication component 730, derivation component 740, constraint component 750, decoding component 760, detection component 770, and cancellation component 780.

Similar to processor component 410 in network entity 400, processor component 710 is configured to execute computer-readable instructions related to performing any of a plurality of functions. Processor component 710 can be a single processor or a plurality of processors dedicated to analyzing information to be communicated from wireless terminal 700 and/or generating information that can be utilized by memory component 720, communication component 730, derivation component 740, constraint component 750, decoding component 760, detection component 770, and/or cancellation component 780. Additionally or alternatively, processor component 710 may be configured to control one or more components of wireless terminal 700.

In another aspect, memory component 720 is coupled to processor component 710 and configured to store computer-readable instructions executed by processor component 710. Memory component 720 may also be configured to store any of a plurality of other types of data including data generated by any of communication component 730, derivation component 740, constraint component 750, decoding component 760, detection component 770, and/or cancellation component 780. Here, it should be noted that memory component 720 is analogous to memory component 420 in network entity 400. Accordingly, it should be appreciated that any of the aforementioned features/configurations of memory component 420 are also applicable to memory component 720.

In yet another aspect, wireless terminal 700 includes communication component 730, which is coupled to processor component 710 and configured to interface wireless terminal 700 with external entities. For instance, communication component 730 may be configured to receive a transmission of a system information block (e.g., an SIB1 transmission, an SIB2 transmission, etc.). In a particular embodiment, system information block transmissions are received via a plurality of redundancy versions. Within such embodiment, communication component 730 is configured to distinguish a first subset of the plurality of redundancy versions associated with legacy wireless terminals from a second subset of the plurality of redundancy versions associated with non-legacy wireless terminals. Here, it is contemplated that system information block transmissions provided via the second subset may be decoded by wireless terminal 700 without having to decode a Physical Downlink Control Channel transmission, whereas system information block transmissions provided via the first subset may require decoding a Physical Downlink Control Channel transmission.

As illustrated, wireless terminal 700 may also include derivation component 740. Within such embodiment, derivation component 740 is configured to derive a type of scheduling information associated with system information block transmissions from at least one parameter known to wireless terminal 700. Here, it should be noted that the derived type of scheduling information may include various types of scheduling information including, for example, a resource block allocation, whereas the at least one parameter known to wireless terminal 700 may include various types of known parameters including, for example, a system frame number or a cell identifier.

In another aspect, wireless terminal 700 includes constraint component 750, which is configured to identify a constraint associated with a second type of scheduling information. Here, it is contemplated that any of a plurality of constraints may be implemented. For instance, in a particular embodiment, the constraint is associated with a limiting of a possible number of modulation and coding scheme choices, wherein a reduction of blind decode operations performed by wireless terminal 700 is facilitated by the constraint.

Wireless terminal 700 may also include decoding component 750. Within such embodiment, decoding component 750 is configured to decode system information blocks based on the type of scheduling information derived by derivation component 730. Moreover, by deriving the type of scheduling information from known parameters, decoding component 750 may decode system information blocks independent of a Physical Downlink Control Channel transmission.

In a further aspect, it is contemplated that wireless terminal 700 may be configured to perform interference cancellation techniques upon receiving system information blocks that either fully collide or partly collide. For instance, communication component 730 may be configured to receive a first system information block from a first base station and a second system information block from a second base station, wherein either of the first or second system information blocks can be any of various types of system information blocks (e.g., an SIB1, an SIB2, etc.). Detection component 770 is then configured to detect a collision between the first system information block and the second system information block. In an aspect, detection component is configured to analyze a parameter known to wireless terminal 700 which may, for example, include a system frame number or a cell identifier. For this embodiment, cancellation component 780 is then configured to cancel reconstructed symbols corresponding to the contents decoded from the first system information block based on a detection of the collision, whereas decoding component 760 is configured to decode the second system information block once the reconstructed symbols corresponding to the contents decoded from the first system information block are cancelled.

Turning to FIG. 8, illustrated is a system 800 that facilitates detecting a system information block according to an embodiment. System 800 and/or instructions for implementing system 800 can reside within user equipment (e.g., wireless terminal 700). As depicted, system 800 includes functional blocks that can represent functions implemented by a processor using instructions and/or data from a computer readable storage medium. System 800 includes a logical grouping 802 of electrical components that can act in conjunction. As illustrated, logical grouping 802 can include an electrical component for receiving a transmission of a system information block 810, as well as an electrical component for deriving a type of scheduling information associated with the transmission from at least one known parameter 812. Furthermore, logical grouping 802 can include an electrical component for decoding the system information block based on the type of scheduling information 814. Additionally, system 800 can include a memory 820 that retains instructions for executing functions associated with electrical components 810, 812, and 814. While shown as being external to memory 820, it is to be understood that electrical components 810, 812, and 814 can exist within memory 820.

Referring next to FIG. 9, a flow chart illustrating an exemplary method that facilitates detecting system information blocks in heterogeneous networks is provided. As illustrated, process 900 includes a series of acts that may be performed by various components of user equipment (e.g., wireless terminal 700) according to an aspect of the subject specification. Process 900 may be implemented by employing at least one processor to execute computer executable instructions stored on a computer readable storage medium to implement the series of acts. In another embodiment, a computer-readable storage medium comprising code which causes at least one computer to implement the acts of process 900 is contemplated.

In an aspect, process 900 begins with a communication being established with a network at act 910. Next, at act 920, system information blocks are received, wherein such system information blocks may be received from serving nodes as well as interfering nodes. Accordingly, in an aspect, scheduling information for both the serving node and the interfering node are derived from known parameters. Namely, scheduling information for the serving node is derived at act 925, whereas scheduling information for the interfering node is derived at act 930.

As stated previously, embodiments are contemplated in which system information blocks within a heterogeneous network are scheduled according to an orthogonal scheduling, a fully colliding scheduling, or a partly colliding scheduling. Therefore, at act 940, process 900 proceeds by determining whether the system information block transmission from the serving node collides with a system information block transmission from the interfering node. If it is determined that the system information block transmissions do not collide, process 900 proceeds to act 945 where a constraint associated with the serving scheduling information is identified, followed by a decoding of the serving system information block at act 955.

However, if it is determined that the system information block transmissions indeed collide, process 900 proceeds to act 950 where a constraint associated with the interfering scheduling information is identified. The interfering system information block is then decoded at act 960, followed by a cancelling of the interfering system information block at act 970. Process 900 then proceeds to act 945 where a constraint associated with the serving scheduling information is identified, followed by a decoding of the serving system information block at act 955.

Exemplary Communication System


Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Method and apparatus that facilitates detecting system information blocks in a heterogeneous network patent application.
###
monitor keywords

Qualcomm Incorporated - Browse recent Qualcomm patents

Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Method and apparatus that facilitates detecting system information blocks in a heterogeneous network or other areas of interest.
###


Previous Patent Application:
Method and apparatus for sounding reference signal triggering and power control for coordinated multi-point operations
Next Patent Application:
Method and arrangement for adapting power of reference signals
Industry Class:
Multiplex communications
Thank you for viewing the Method and apparatus that facilitates detecting system information blocks in a heterogeneous network patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.75298 seconds


Other interesting Freshpatents.com categories:
Electronics: Semiconductor Audio Illumination Connectors Crypto

###

Data source: patent applications published in the public domain by the United States Patent and Trademark Office (USPTO). Information published here is for research/educational purposes only. FreshPatents is not affiliated with the USPTO, assignee companies, inventors, law firms or other assignees. Patent applications, documents and images may contain trademarks of the respective companies/authors. FreshPatents is not responsible for the accuracy, validity or otherwise contents of these public document patent application filings. When possible a complete PDF is provided, however, in some cases the presented document/images is an abstract or sampling of the full patent application for display purposes. FreshPatents.com Terms/Support
-g2-0.3247
Key IP Translations - Patent Translations

     SHARE
  
           

stats Patent Info
Application #
US 20140036838 A1
Publish Date
02/06/2014
Document #
14050896
File Date
10/10/2013
USPTO Class
370329
Other USPTO Classes
International Class
04L5/00
Drawings
13


Your Message Here(14K)


Physical Downlink Control Channel
Downlink Control Channel
Heterogeneous Network
Codes
Downlink
Heterogeneous
Scheduling
Wireless


Follow us on Twitter
twitter icon@FreshPatents

Qualcomm Incorporated

Qualcomm Incorporated - Browse recent Qualcomm patents

Multiplex Communications   Communication Over Free Space   Having A Plurality Of Contiguous Regions Served By Respective Fixed Stations   Channel Assignment