Difference between revisions of "LTE"

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Revision as of 06:48, 16 May 2011

This report presents a brief summary about LTE-MIMO.A detailed taxonomy which covers most of the aspects of LTE is presented. A sample of mapping patents to the standard by using graphical analysis and patent ranking is presented. LTE related ETSI and non-ETSI documents are also shown.

Dolcera Landscape Procedure

  • Background study - Background study is done with web search depending on the area of client interest.
  • Finding key player/inventors - Web search is carried out to find the products and technologies of key players.
  • Patents Search -
    • Key patents search.
    • Prepared search queries using keywords and classification and finalized these in Micropat/Thompson.
  • Patents Classification - Classify all patents by creating taxonomy.
  • Specific analysis as required by client like SWOT, SOA, PEST, Claim, and White Space analysis.
  • Reporting -
    • All necessary data are presented in format of wiki or in form of power point slides.
    • Dashboard - Graphical representation of Patents classification.


Rationale

  • LTE is the most suited technology as it provides higher data rates required for the future and is an advancement over widely used GSM/EDGE/HSPA
  • A number of corporate giants are looking towards LTE as the technology enabling future communication
  • The following factors are expected to be obtained with the realization of LTE
    • Reduced cost per bit
    • Increased service provisioning - more services at lower cost with better user experience
    • Flexibility of use of existing and new frequency bands
    • Simplified architecture, Open interfaces
    • Allow for reasonable terminal power consumption

Background description

LTE (Long Term Evolution), is the latest standard in the mobile network technology that came into existence because of the growing needs of faster data rates. It is a 3rd Generation Partnership Project (3GPP), which realized this technology. LTE is an advancement to previously realized technologies such as GSM/EDGE and UMTS/HSxPA etc.Although LTE is often marketed as 4G, first-release LTE is actually a 3.9G technology since it does not fully comply with the IMT Advanced 4G requirements.

Update - LTE-Advanced has been granted 4G compliance given the significant improvement they provide over 3G technologies [1]

Voice traffic will be supported mainly as Voice over IP (VoIP) enabling better integration with other multimedia services.LTE is being designed to be a high data rate and low latency system. LTE is also aimed at minimizing cost and power consumption while ensuring backward-compatibility and a cost effective migration from UMTS systems. LTE tutorial

Technical details

Performance requirements

LTE is expected to support different types of services including web browsing, FTP, video streaming, VoIP, online gaming, real time video, push-to-talk and push-to-view. Therefore, it is being designed to be a high data rate and low latency system as indicated by the key performance criteria shown below.

LTE architecture

Protocol stack

Data flow

The data flow through protocol stack can be shown as

LTE frame structure

In order to maintain synchronization and manage different types of information exchange that need to be carried between the base-station or eNodeB and the User Equipment (UE), LTE system has a defined LTE frame and sub frame structure for the E-UTRA or Evolved UMTS Terrestrial Radio Access

There are two types of LTE frame structure:

  • Type 1:used for the LTE FDD mode systems
    • The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE sub frames then consist of two slots - in other words there are ten LTE sub frames within a frame.
  • Type 2:used for the LTE TDD systems
    • The frame structure for the type 2 frames used on LTE TDD is somewhat different. The 10 ms frame comprises two half frames, each 5 ms long. The LTE half-frames are further split into five sub frames, each 1ms long.
  • The subframes may be divided into standard sub frames of special sub frames. The special sub frames consist of three fields
    • DwPTS - Downlink Pilot Time Slot
    • GP - Guard Period
    • UpPTS - Uplink Pilot Time Slot.

LTE enabling technologies

  • OFDMA (Orthogonal Frequency Division Multiple Access)
    • It is used in the downlink communication of LTE as it can support high data rates
  • SC-FDMA (Single Carrier FDMA)
    • It is used in the uplink communication of LTE as it helps in reducing terminal power consumption
  • MIMO (Multi-Input Multi-Output)
    • Helps in obtaining increased data rates with usage of many antennas.
  • System Architecture Evolution(SAE)
    • New core network architecture to support the high-throughput / low latency LTE access system
    • Simplified network architecture
    • All IP network
    • All services are via PS domain only, No CS domain
    • Support mobility between multiple heterogeneous access system
  • Fractional frequency reuse
    • Helps in reusing the frequency so that spectral efficiency can be improved

Taxonomy

Major players in the ETSI list for LTE

Etsifa.jpg

Relevant Documents for LTE in the ETSI list

S.No Publication Number Title Filing date Expiry date Priority Date Assignee/Applicant Count of Cited Refs - Patent Rating
1 US5754976A Algebraic codebook with signal-selected pulse amplitude/position combinations for fast coding of speech 7/28/1995 7/28/2015 1990-02-23 | 1992-09-10 | 1995-02-06 | 1995-07-28 Universite de Sherbrooke,Sherbrooke,CA 44 2
2 US6724976B2 Communication system 12/21/2000 12/21/2020 1992-03-26 | 1992-09-25 | 1993-03-25 | 1993-09-27 | 1998-04-22 | 2000-02-16 | 2000-12-21 Matsushita Electric Industrial Co. Ltd.,Osaka,JP 110 3
3 US6633600B2 Traffic lights in a code division multiple access (CDMA) modem 4/24/2001 4/24/2021 1995-06-30 | 1996-06-27 | 1998-02-17 | 1999-11-22 | 2001-04-24 InterDigital Technology Corporation,Wilmington,DE,US 85 3
4 US7190966B2 Method and apparatus for performing an access procedure 6/29/2005 6/29/2025 1996-06-27 | 1998-01-06 | 2000-11-22 | 2002-03-01 | 2003-03-26 | 2004-06-14 | 2005-06-29 InterDigital Technology Corporation,Wilmington,DE,US 91 4
5 US7437177B2 Method employed by a base station for controlling initial power ramp-up using short codes 3/14/2008 3/14/2028 1996-06-27 | 1998-01-06 | 2000-11-22 | 2002-03-01 | 2003-03-26 | 2004-06-14 | 2005-06-29 | 2008-03-14 InterDigital Communications Corp.,Wilmington,DE,US 190 4


Disclaimer:

  • Rating is given based on claims, no.of cited patents, expiry date and priority date
  • Rating is done on a scale from 1 to 5

Ranking of ETSI patents

S.No Patent/Publication No. International Class (primary) Assignee Title Publication Year Priority Year(s) Legal Status Rank
1 US20100182939A1 H04J000300 Nokia Corporation Configuration of multi-periodicity semi-persistent scheduling for time division duplex operation in a packet-based wireless communication system 2010 2008 | 2009 Docketed New Case - Ready for Examination 2
2 EP2181559A1 H04W003608 Nokia Siemens Networks handover of a user equipment with forwarding and reusing a user equipment configuration 2010 2007 | 2008 | 2008 Request for Examination Filed 2
3 EP2213034A2 H04L000118 Nokia Siemens Networks Improved ack/nack dtx detection and signalling of not receiving a downlink allocation grant message 2010 2007 | 2008 | 2008 | 2008 Request for Examination Filed 2
4 EP2248373A1 H04W002818 Ericsson AB Methods and arrangements for a mobile communications network 2010 2008 | 2008 | 2008 Request for Examination Filed 2
5 EP1961141A2 H04L000100 Ericsson AB efficient channel quality reporting and link adaptation for multi-carrier broadband wireless communication 2008 2005 | 2006 | 2006 Request for Examination Filed 2
6 US20110029834A1 H04L000118 Alcatel-Lucent Method for operating harq buffer 2011 2008 | 2009 | 2009 Docketed New Case - Ready for Examination 2
7 US20110090866A1 H04W003600 Alcatel-Lucent Method, user equipment and communication system for inter-rat handover in 3g lte 2011 2008 | 2008 Docketed New Case - Ready for Examination 2
8 US20110093756A1 H04L000118 Alcatel-Lucent Method for dl semi-persistent scheduling harq process allocation and apparatus thereof 2011 2008 | 2008 Application Dispatched from Preexam, Not Yet Docketed 2
9 EP2248356A1 H04W000400 Alcatel-Lucent Method, user equipment and communication system for inter-rat handover in 3g lte 2010 2008 | 2008 Request for Examination Filed 2
10 EP2242322A1 H04W008000 Alcatel-Lucent Method for the harq buffer operation 2010 2008 | 2009 | 2009 Request for Examination Filed 2
11 EP2291019A1 H04W001610 Alcatel-Lucent Method for harq process allocation of dl semi-persistent scheduling and corresponding system 2011 2008 | 2008 Request for Examination Filed 2
12 US20090268683A1 H04W007204 Qualcomm Incorporated Partial radio link control status report 2009 2008 | 2009 Docketed New Case - Ready for Examination 3
13 US20090086710A1 H04J000324 Qualcomm Incorporated Method and apparatus for implementing lte rlc header formats 2009 2007 | 2008 Docketed New Case - Ready for Examination 3
14 EP2068505A1 H04L001256 Alcatel-Lucent Method and device for reporting the uplink scheduling request and the emergency status in the wireless networks 2009 2006 | 2007 | 2007 Request for Examination Filed 3
15 EP2180627A1 H04L000108 Alcatel-Lucent A communication method and equipment for controlling the data transmission and retransmission of mobile station at the base station 2010 2007 | 2007 Request for Examination Filed 3
16 EP2198533A2 H04B000704 Ericsson AB Method and arrangements for signaling control information in a communication system 2010 2007 | 2008 | 2008 Request for Examination Filed 3
17 EP2220841A1 H04L002906 Ericsson AB Method and system for correlating aaa sessions 2010 2007 | 2008 | 2008 Request for Examination Filed 3
18 EP2250856A1 H04W008400 Nokia Siemens Networks Server identifier acquisition based on device location 2010 2008 | 2008 Request for Examination Filed 3
19 EP2263411A2 H04W007212 Ericsson AB Prohibiting unnecessary scheduling requests for uplink grants 2010 2008 | 2009 | 2009 Request for Examination Filed 3
20 US20100080152A1 H04L002902 Nokia Siemens Networks Method and apparatus for providing signaling of redundancy versions 2010 2008 | 2009 Non Final Action Mailed 3
21 US20090268844A1 H04L002700 Nokia Siemens Networks Method and apparatus to link modulating and coding scheme to amount of resources 2009 2008 | 2008 | 2008 | 2009 Docketed New Case - Ready for Examination 3

Click here to see full list of Ranking of ETSI patents

Disclaimer: Patent ranking has been done according to the following logic:

  • Rank-1: Granted + LTE related (claims)
  • Rank-2: Published + LTE related (claims)
  • Rank-3: LTE related (Full spec )
  • Rank-4: May be relevant and requires further analysis
  • Rank-5: Abandoned or Expired


Ptrank1.jpg

Note: Here a total of 44 patents from ETSI have been taken, out of which Qualcomm Incorporated has 6 patents, Alcatel-lucent has 8 patents, Ericsson AB, Nokia corporation, Nokia Siemens Networks have 10 each

MIMO(Multiple Input Multiple Output)

Multiple input multiple output (MIMO) technologies introduced in LTE such as spatial multiplexing, transmit diversity, and beamforming are key components for providing higher peak rate at a better system efficiency, which are essential for supporting future broadband data service over wireless links.In Long Term Evolution (LTE), MIMO technologies have been widely used to improve downlink peak rate, cell coverage, as well as average cell throughput.

To achieve this diverse set of objectives, LTE adopted various MIMO technologies including transmit diversity, single user (SU)-MIMO, multiuser (MU)-MIMO, closed-loop rank-1 precoding, and dedicated beamforming. MIMO in LTE


Concept table for MIMO

S.no MIMO OFDMA SCFDMA Interference SDMA HARQ Multipath LTE Others
1 Multiple adj input* adj multiple adj output* OFDM scfdma interference near3 mitigate* Space adj2 time adj2 transmit adj2 diversity HARQ Multipath near2 effect* LTE channel adj2 quality adj2 indication adj2 channel*
2 Distributed adj transmission adj directional adj reception (orthogonal adj frequency adj division) near2 multiplex* SINGLE adj CARRIER adj FREQUENCY adj DIVISION adj MULTIPLE adj ACCESS* interference near3 cancel* antenna adj2 multiplex* Hybrid adj automatic adj repeat adj request Multipath near2 propagat* Long term evolution CQICH
3 DTDR ofdma scfdm interference near3 reduc* SDMA feedback adj2 mechani* Multipath near2 phenomenon Evolved packet system Downlink adj2 Channel adj2 Descriptor adj2 message*
4 transmission adj2 diversit* (orthogonal adj frequency adj division) near2 (multiple adj access) single adj carrier adj frequency adj division adj multiplex* interference near3 null* Space adj2 division adj2 multiple adj2 access Hybrid ARQ System architecture evolution adaptive adj2 modulation adj2 coding
5 SFBC discrete adj multi adj tone SC-FDMA Space adj2 domain adj2 multiple adj2 access ARQ E-UTRA* pre adj coding*3
6 Space adj2 frequency adj2 block adj coding DMT DFT-spread adj OFDM plural* near2 (spatial adj streams automatic adj repeat adj request Evolved UMTS terrestrial radio access per adj2 antenna adj2 rate adj2 control
7 SU adj2 MIMO (adaptive ADJ modulation*) DFT-S-OFDMA spatial adj2 adaptation Automatic Repeat Query permutation adj2 mode adj2 selection
8 MU adj2 MIMO sofdm Interleaved adj FDMA adaptive adj2 transmi*
9 space adj2 time adj2 cod* Interleaved adj Frequency adj Division adj Multiple adj Access Bell adj2 Labs adj2 Layer adj2 Space adj2 Time
10 multiple adj antenna* IFDMA spatial adj2 multiplex*
11 multi adj antenna* Discrete adj Fourier adj Transform adj Spread adj Orthogonal adj Frequency adj Multiple adj Access
12 multiple adj transmit* adj2 receive* DFT- SOFDM
13 plural* adj2 antenna*
14 atleast adj2 two adj2 antenna*
15 layer adj map*4
16 beam adj2 steer*
17 smart adj antenna*1
18 spatial adj multiplex*3
19 multiple adj transmit* adj antenna*1
20 multiple adj receive* adj antenna*1
21 Adaptive adj2 antenna adj2 steer*
22 beam adj2 forming
23 eigenmode adj2 multiplex*

Control patents

  • Control patents are mostly used
    • to prepare concepts
    • to search classes, and
    • to verify the search strategy
  • Control patents are found by running a query with narrow keywords, and in this process litigation's and file wrappers are also looked at.
S.No Patent/Publication No. Title Abstract
1 US6873606 Rate adaptive transmission scheme for MIMO systems A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.
2 US7233625 Preamble design for multiple input--multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets and other corrections to the transmitted signal.
3 US7248559 Scattered pilot pattern and channel estimation method for MIMO-OFDM systems A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.
4 US7548506 System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
5 US7120395 MIMO communications The present invention allows a wireless communication system, such as a base station, to select N antennas from an associated group of M antennas for transmitting multiple streams of data to a given user. Based on the channel conditions between the M antennas of the wireless communication system and the multiple antennas at the receiver, the N antennas to use for transmission are selected to enhance channel capacity, signal-to-noise ratios, or a combination thereof. The channel conditions are measured at the receiver, and may be sent back to the wireless communication system for processing or may be processed at the receiver, wherein instructions are transmitted back to the wireless communication system to control antenna selection.

Click here to see full list of LTE control patents

Search Strategy - MIMO

Company wise distribution of IP

Company wise distribution of IP

Note:

  • The subsidiaries of Nokia includes : Nokia Telecommunication Oy and Nokia Siemens.
  • The subsidiaries of Ericsson/LM Ericsson includes : Ericsson GE Mobile Communications Inc, ST-Ericsson, Sony Ericcson.
  • The Subsidiaries of Alcatel includes : Alcatel-Lucent, Alcatel Shangai bell company, Alcatel Transmission, Lucent Technologies, CIT Alcatel.
  • The Subsidiaries of NTT includes : Nippondenso Co, NTT Docomo.
  • The subsidiaries of NEC Corp includes : NEC Access technica Ltd.,NEC Laboratories.
  • The subsidiaries of Phlilps includes : Philips Electronics, Philips Intellectual property & standards.
  • The subsidiaries of Fujistu includes : Fujistu ten Limited, Fujitsu Microelectronics Limited.
  • The subsidiaries of AT&T includes : AT&T Mobility, AT & T BLS Intellectual Property, AT&T Bell Laboratories, AT&T Wireless Services Inc., BellSouth Intellectual Property Corporation.

Filing trends over the years

Filing trends over the years

Year by year trends of top 5 companies

Year by year trends of top 5 companies

Major players in the non-ETSI list for MIMO

Non playders.jpg

Major companies for low cost IP for MIMO

Smalls.jpg

Disclaimer 1: Here primarily, companies with an average annual revenue less than 400 million USD are considered. In addition to these, some big companies whose primary interest is not LTE and those which provide IP licensing are also considered.

Disclaimer 2 :The above graph is based on raw data available with us. Some of the patents may not be relevant

Most cited documents in non-ETSI list for MIMO

S.No Patent/Publication No. Title Priority Date Assignee/Applicant Count of Citing Patents
1 US5541955A Adaptive data rate modem 1992-11-06 | 1995-04-28 Pericle Communications Company 272
2 US5999561A Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency 1997-05-20 | 1997-07-08 | 1997-09-15 Sanconix Inc 161
3 US5752164A Autonomous remote measurement unit for a personal communications service system 1992-04-27 | 1995-04-25 American PCS L 146
4 US4441180A Service integrated communication transmission and interchange system 1979-06-01 | 1980-05-30 Licentia Patent Verwaltungs GmbH 134
5 US6072994A Digitally programmable multifunction radio system architecture 1995-8-31 Northrop Grumman Corporation 133
6 US6314147B1 Two-stage CCI/ISI reduction with space-time processing in TDMA cellular networks 1997-11-04 | 1998-11-04 The Board of Trustees of the Leland Stanford Junior University 132
7 US5859878A Common receive module for a programmable digital radio 1995-8-31 Northrop Grumman Corporation 131
8 US5345471A Ultra-wideband receiver 1993-12-4 The Regents of the University of California 130
9 US5694134A Phased array antenna system including a coplanar waveguide feed arrangement 1992-12-01 | 1993-10-21 | 1994-01-14 Superconducting Core Technologies, Inc. 128
10 US5347286A Automatic antenna pointing system based on global positioning system (GPS) attitude information 1992-02-13 | 1993-03-19 Trimble Navigation Limited 115

Patent mapping by graphical analysis

Sno. Patent/Publication No. Title Figure analyzed Analyzed result Standard mapped into
1 US20070217538A1 Systems and methods for improving performance of multiple spatial communication channels Figure 4 DL data rate: 220 M bps for 3x3 advanced MIMO-SVD LTE release 8, category 4
2 US20090232229A1 Device, system and method of resource allocation in a wireless network Figure 2A DL data rate: 210 M bps for a 2x2 MIMO at cell centre LTE release 8, category 5

Ranking of Non ETSI patents

Sno. Patent/Publication No. US Class (primary) Title Publication Year Priority Year(s) Legal status Rank
1 US7548730B2 375267 Systems and methods for improving performance of multiple spatial communication channels 2007 2006 Patented Case 1
2 US20090232229A1 375260 Device, system and method of resource allocation in a wireless network 2009 2008 Docketed New Case - Ready for Examination 2
3 US20080187066A1 375267 Detection method and apparatus for a multi-stream MIMO 2008 2007 Non Final Action Mailed 2
4 US7796546B2 370315 Apparatus and method for supporting multiple links in a network using frequency bands 2007 2006 Patented Case 4

Disclaimer: Patent ranking has been done according to the following logic:

  • Rank-1: Granted + LTE related (claims)
  • Rank-2: Published + LTE related (claims)
  • Rank-3: LTE related (Full spec )
  • Rank-4: May be relevant and requires further analysis
  • Rank-5: Abandoned or Expired






Interactive Taxonomy

Note:This interactive taxonomy consists of 131 sample documents.

Dolcera Dashboard

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LTE - Dashboard
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LTE Release 8

LTE Release 8

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References

  • Stefania Sesia, Issam Toufik, and Matthew Baker, "LTE - The UMTS Long Term Evolution - From Theory to Practice", John Wiley & Sons, 2009,
  • Martin Sauter, "From GSM to LTE - An Introduction to Mobile Networks and Mobile Broadband", John Wiley & Sons, 2010,
  • Erik Dahlman, Stefan Parkvall, Johan Sköld, Per Beming, "3G Evolution - HSPA and LTE for Mobile Broadband", 2nd edition, Academic Press, 2008,
  • Mustafa Ergen, "Mobile Broadband - Including WiMAX and LTE", Springer, NY, 2009
  • Borko Furht, Syed A. Ahson, "Long Term Evolution: 3GPP LTE Radio And Cellular Technology", CRC Press, 2009,
  • Ezio Biglieri, Robert calderbank, Anthony Constantinides et.al ,"MIMO Wireless Communications" Cambridge University Press, 2007


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