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

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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

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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.

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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.



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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


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


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