WO2005074171A2 - A method for transmitting multiple streams in wireless broadcast networks - Google Patents
A method for transmitting multiple streams in wireless broadcast networks Download PDFInfo
- Publication number
- WO2005074171A2 WO2005074171A2 PCT/US2005/002677 US2005002677W WO2005074171A2 WO 2005074171 A2 WO2005074171 A2 WO 2005074171A2 US 2005002677 W US2005002677 W US 2005002677W WO 2005074171 A2 WO2005074171 A2 WO 2005074171A2
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- WO
- WIPO (PCT)
- Prior art keywords
- stream
- transmitting
- tone
- act
- sfream
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/42—Arrangements for resource management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
Definitions
- the present invention relates generally to a broadcast system, more particularly, to a broadcast of content from transmitters from different geographical areas.
- 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, and orthogonal frequency division multiple access (OFDMA) systems.
- CDMA code division multiple access
- TDMA time division multiple access
- FDMA frequency division multiple access
- OFDMA orthogonal frequency division multiple access
- the wireless communication system further employs a broadcast system, wherein portion of the forward link resources are dedicated for broadcasting content.
- the broadcast system all the recipients process data received on the dedicated channel on the forward link (i.e., frequency tones that make up a shared channel), as if the information was targeted for the recipient.
- a typical broadcast system does not require any acknowledgement from the recipients regarding the reception of data.
- operators of the system generally configure the AP (or access points) to use low data rate (e.g., repeat the transmission data packets that make up the content) and at high power in order to insure that all the mobile stations within the base station's coverage area receive the content, including any mobile stations that are far from the base station.
- low data rates are generally needed only for mobile stations that operate far from the currently servicing base station. Thus, all the mobile stations that operate near the base station cannot enjoy higher data rates.
- FIG. 1 shows a diagram of a wireless multiple-access communication system
- FIG. 2 a block diagram of a communication system
- FIG. 3 shows an illustration of exemplary frame of a communication system
- FIG. 4 illustrates a process for broadcasting content using two streams.
- the word "exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments or designs.
- the word “listening” is used herein to mean that a terminal is receiving and processing data received on a given channel.
- FIG. 1 shows a diagram of a wireless multiple-access communication system 100 that employs multi-carrier modulation.
- System 100 as shown includes access points, for example 102a and 102b that communicate with a number of access terminals 130a - 130b. For simplicity, only two access points 102a and 102b and only two access terminals 130a-130b are shown in FIG. 1.
- AT access terminal
- AP access point
- AP 102a services service area 1 and AP 102b services service area 2.
- the AP 102a has service coverage defined by 106 having a radius vector 120 and the AP 102b has service coverage defined by 108 having a radius vector 122.
- area 106 and 108 are serviced using the base streams for broadcast system. Note that 106 and 108 assumes that interference does not exit.
- the service area is reduced and defined as coverage hole 116.
- AP 102a and 102b further defines a service area 110 and 112, respectively, and area serviced using a layered scheme (e.g. use of both enhanced stream and base stream), discussed below.
- a coverage hole 116 is shown for illustrating the area where signals from AP 102a and AP 102b interfere with each other.
- the coverage hole boundary 114 is shown which defines the coverage hole 106.
- the AT 130b, operating within coverage hole boundary 114 would not be able to receive the content.
- An access point 102x is an electronic device configured to communicate with one or more user access terminals and may also be referred to as a base station, base terminal, fixed terminal, a fixed station, base station controller, a controller, transmitter or some other terminology.
- the access point, base terminal, and base station are interchangeably used in the description below.
- the access point 102x may be a general purpose computer, a standard laptop, a fixed terminal, an electronic device configured to transmit, receive and process data according to air interface methods defined by an OFDMA, CDMA, GSM, WCDMA, etc., or an electronic module comprising one or more computer chips controlled by a controller or a processor for transmitting, receiving and processing data according to air interface methods defined by an OFDMA, CDMA, GSM, WCDMA, etc.
- An AT 130x is an electronic device configured to communicate with the access point via a communication link.
- the AT 13 Ox may also be referred to as a terminal, a user terminal, a remote station, a mobile station, a wireless communication device, recipient terminal, or some other terminology.
- the AT 130x, mobile terminal, user terminal, terminal are interchangeably used in the description below.
- Each AT 13 Ox may communicate with one or multiple access points on the downlink and/or uplink at any given moment.
- the downlink i.e., forward link
- the uplink i.e., reverse link
- the AT 130x may be any standard laptop, personal electronic organizer or assistant, a mobile phone, cellular phone, an electronic device configured to transmit, receive and process data according to air interface methods defined by an OFDMA, CDMA, GSM, WCDMA, etc. system, or an electronic module comprising one or more computer chips controlled by a controller or a processor for transmitting, receiving and processing data according to air interface methods defined by an OFDMA, CDMA, GSM, WCDMA, etc. system.
- a system controller 140 couples to the access points and may further couple to other systems/networks (e.g., a packet data network). System controller 140 provides coordination and control for the access points coupled to it. Via the access points, system controller 140 further controls the routing of data among the terminals, and between the terminals and other users coupled to the other systems/networks. The system controller 140 may be used to update the transmit information for the base and enhanced streams.
- FIG. 2 shows a block diagram of an embodiment of two access points 102x and 102y and a AT 130x in multiple-access multi-carrier communication system 200.
- a transmit (TX) data processor 214 receives content data from a data source 212 and signaling and other information from a controller 220 and a scheduler 230. These various types of data may be sent on different transport or broadcast channels.
- TX data processor 214 encodes and modulates the received data using multi-carrier modulation (e.g., OFDM) to provide modulated data (e.g., OFDM symbols).
- the controller 220 converts the content into two data streams, a base stream and an enhanced stream.
- the controller 220 modulates the stream based on pre-determined scheme.
- a transmitter unit (TMTR) 216 then processes the modulated data to generate a downlink modulated signal that is then transmitted from an antenna 218.
- TMTR transmitter unit
- the terminal 130x receives the modulated signal via an antenna 252 and provides to a receiver unit (RCNR) 254.
- Receiver unit 254 processes and digitizes the received signal to provide samples.
- a received (RX) data processor 256 then demodulates and decodes the samples to provide decoded data, which may include recovered traffic data, messages, signaling, and so on.
- the traffic data may be provided to a data sink 258, and the carrier assignment sent for the terminal are provided to a controller 260.
- Controller 260 processes the received data stream based on information provided by the AP 102x during registration process.
- a TX data processor 274 receives traffic data from a data source 272 and signaling and other information from controller 260.
- the various types of data are coded and modulated by TX data processor 274 using the assigned carriers and further processed by a transmitter unit 276 to generate an uplink modulated signal that is then transmitted from antenna 252.
- the transmitted and modulated signals from the terminals are received by antenna 218, processed by a receiver unit 232, and demodulated and decoded by an RX data processor 234.
- Receiver unit 232 may estimate the received signal quality (e.g., the received signal-to-noise ratio (SNR)) for each terminal and provide this information to controller 220.
- Controller 220 may then derive the PC commands for each terminal such that the received signal quality for the terminal is maintained within an acceptable range.
- RX data processor 234 provides the recovered feedback information (e.g., the required transmit power) for each terminal to controller 220 and scheduler 230.
- FIG 3 illustrates a frame 302 used in the OFDMA system.
- the frame is defined by frequency and time.
- multiple tones for example 304, 306 and 308, are defined for transmitting data.
- a tone comprises frequency value for duration of time. The frequency value is determined by the operator based on the available resources.
- tone 304 may be used, wherein two streams may be layered, for transmitting the streams.
- a layered modulation (also referred to as layered scheme) in a broadcast system is employed. Layered modulation consists of transmitting multiple streams together, with each stream targeted towards a subset of users with a certain minimum channel quality.
- the OFDM broadcast system is used for illustration. Note that the methods described herein may be employed using any other system that provides broadcast capabilities and orthogonalization capabilities across transmitters. Furthermore, only one AP 102x is used for a service area and two service areas used for illustration purposes, as shown in FIG 1 above. Also, the broadcast is done using OFDM and re-use is achieved by allocating disjoint sets of tones to each AP 102x. The number of tones in each set is equal.
- the signal from each AP 102x goes through an additive white Guassian noise (AWGN) channel and the layered modulation comprises of sending two streams, a base stream targeted towards all users in the service areas and an enhancement stream targeted towards users with better signal-to-noise ratio (SNR).
- AWGN additive white Guassian noise
- tones are divided into two disjoint sets, * and ⁇ , each with N tones.
- * and ⁇ the transmitted symbols at the different tones are given by
- the symbol from the second service area can be written in a similar manner, with the
- Equation 2 The spectral efficiency for the base stream is given by Equation 2 where the factor of ⁇ ⁇ arises because we are using only half the tones.
- the rate for the enhancement stream is governed by the worst case SINR in a smaller coverage area, where the SINR includes base stream 2 and
- the above rates for the base and enhancement streams are larger than those with no reuse for the base (i.e. all 2N tones used for both base and enhancement) as well as those with a reuse factor of two (i.e. only N tones used for base and enhancement at each transmitter).
- the service provider maps out the physical location of the AP.
- FIG. 4 illustrates a process 400, for broadcasting content using two streams.
- the AP 102x is configured to execute steps of the process 400 by utilizing at least one of various components described in FIG. 2 for example, the controller 220, the scheduler 230, the memory 222, the TX data processor 214, RX data processor 234, etc. In an embodiment, AP 102x is pre-selected to utilize the techniques discussed above.
- AP 102x converts the content into two streams, a first stream (i.e., enhanced stream) and a second stream (i.e. base stream).
- the streams may be series of data packet of the content.
- the enhanced stream is modulated to provided additional data rate in a smaller coverage area than the base stream.
- the AP 102x transmits both streams using the layered scheme, discussed above.
- the AP 102x uses a pre-selected tone to transmit the base stream.
- the frequency of pre-selected tone is orthogonal to the frequency of tone used by one or more of the adjacent AP 102x.
- the same frequency may used for transmitting the base stream, wherein the time (symbol) of transmission is orthogonal to the adjacent AP 102x.
- these techniques may be implemented in hardware, software, or a combination thereof.
- the processing units e.g., controllers 220 and 270, TX and RX processors 214 and 234, and so on
- the processing units may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
- the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein.
- the software codes may be stored in memory units (e.g., memory 222 in FIG. 2) and executed by processors (e.g., controllers 220).
- the memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05706128.5A EP1712053B1 (en) | 2004-01-28 | 2005-01-28 | A method for transmitting multiple streams in wireless broadcast networks |
AU2005208699A AU2005208699B2 (en) | 2004-01-28 | 2005-01-28 | A method for transmitting multiple streams in wireless broadcast networks |
CN2005800098988A CN1939025B (en) | 2004-01-28 | 2005-01-28 | Method for transmitting multiple streams in wireless broadcast networks |
JP2006551490A JP4768634B2 (en) | 2004-01-28 | 2005-01-28 | How to send multiple streams in a wireless broadcast network |
KR1020117007366A KR101120443B1 (en) | 2004-01-28 | 2005-01-28 | A method for transmitting multiple streams in wireless broadcast networks |
BRPI0507147-0A BRPI0507147A (en) | 2004-01-28 | 2005-01-28 | method for transmitting multiple streams over wireless broadcast networks |
CA002554764A CA2554764A1 (en) | 2004-01-28 | 2005-01-28 | A method for transmitting multiple streams in wireless broadcast networks |
IL177085A IL177085A0 (en) | 2004-01-28 | 2006-07-25 | A method for transmitting multiple streams in wireless broadcast networks |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54031004P | 2004-01-28 | 2004-01-28 | |
US60/540,310 | 2004-01-28 |
Publications (2)
Publication Number | Publication Date |
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WO2005074171A2 true WO2005074171A2 (en) | 2005-08-11 |
WO2005074171A3 WO2005074171A3 (en) | 2005-12-01 |
Family
ID=34826212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/002677 WO2005074171A2 (en) | 2004-01-28 | 2005-01-28 | A method for transmitting multiple streams in wireless broadcast networks |
Country Status (12)
Country | Link |
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US (2) | US7787517B2 (en) |
EP (2) | EP1712053B1 (en) |
JP (2) | JP4768634B2 (en) |
KR (4) | KR20060125868A (en) |
CN (1) | CN1939025B (en) |
AU (1) | AU2005208699B2 (en) |
BR (1) | BRPI0507147A (en) |
CA (1) | CA2554764A1 (en) |
IL (1) | IL177085A0 (en) |
RU (1) | RU2006130790A (en) |
SG (1) | SG133597A1 (en) |
WO (1) | WO2005074171A2 (en) |
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EP1579601A2 (en) * | 2002-10-25 | 2005-09-28 | The Directv Group, Inc. | Feeder link configurations to support layererd modulation for digital signals |
JP2010508692A (en) * | 2006-10-31 | 2010-03-18 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Data packet transmission method using various frequency reuse factors |
US8830887B2 (en) | 2007-12-28 | 2014-09-09 | Koninklijke Philips N.V. | System and method for multi-resolution packet transmission for ultra-low power wireless networks |
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RU2006130790A (en) * | 2004-01-28 | 2008-03-20 | Квэлкомм Инкорпорейтед (US) | METHOD FOR TRANSMITTING A LOT OF STREAMS IN WIRELESS BROADCASTING NETWORKS |
US8649264B2 (en) | 2006-10-04 | 2014-02-11 | Qualcomm Incorporated | IP flow-based load balancing over a plurality of wireless network links |
CN101031062B (en) * | 2007-03-21 | 2010-05-26 | 中兴通讯股份有限公司 | Method for transmitting mobile multi-medium broadcasting electronic service guide |
US8638728B2 (en) * | 2007-09-06 | 2014-01-28 | Qualcomm Incorporated | Blind decoding in a mobile environment |
CN101843066B (en) * | 2007-09-28 | 2013-05-29 | 诺基亚公司 | System and method for improved scheduling for time-frequency slicing |
CN101425915B (en) * | 2007-10-30 | 2011-04-20 | 大唐移动通信设备有限公司 | Transmission method, system and device for hierarchy transmission data |
US8654695B2 (en) * | 2007-12-14 | 2014-02-18 | Broadcom Corporation | Link adaptation of a broadcast system |
JP5127065B2 (en) * | 2009-02-27 | 2013-01-23 | シャープ株式会社 | Wireless communication system, wireless communication method, communication device, and terminal device |
CN102104833A (en) * | 2009-12-18 | 2011-06-22 | 上海贝尔股份有限公司 | MBMS service transmission method and system based on layered modulation scheme |
EP2458923B1 (en) * | 2010-11-26 | 2014-07-23 | Alcatel Lucent | Method for providing a minimum coverage for multimedia transmission in presence of switched off cells |
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- 2005-01-28 EP EP05706128.5A patent/EP1712053B1/en not_active Not-in-force
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EP1579601A2 (en) * | 2002-10-25 | 2005-09-28 | The Directv Group, Inc. | Feeder link configurations to support layererd modulation for digital signals |
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US8830887B2 (en) | 2007-12-28 | 2014-09-09 | Koninklijke Philips N.V. | System and method for multi-resolution packet transmission for ultra-low power wireless networks |
Also Published As
Publication number | Publication date |
---|---|
RU2006130790A (en) | 2008-03-20 |
WO2005074171A3 (en) | 2005-12-01 |
JP4768634B2 (en) | 2011-09-07 |
US20100226303A1 (en) | 2010-09-09 |
EP2482476B1 (en) | 2016-05-18 |
US8385386B2 (en) | 2013-02-26 |
US20050163083A1 (en) | 2005-07-28 |
AU2005208699B2 (en) | 2009-02-05 |
JP2007520173A (en) | 2007-07-19 |
EP1712053B1 (en) | 2013-05-29 |
KR20080066093A (en) | 2008-07-15 |
CA2554764A1 (en) | 2005-08-11 |
KR20080065003A (en) | 2008-07-10 |
US7787517B2 (en) | 2010-08-31 |
EP1712053A2 (en) | 2006-10-18 |
AU2005208699A1 (en) | 2005-08-11 |
KR101120443B1 (en) | 2012-02-29 |
JP2011061821A (en) | 2011-03-24 |
EP2482476A3 (en) | 2013-08-28 |
KR20110042130A (en) | 2011-04-22 |
BRPI0507147A (en) | 2007-06-19 |
CN1939025A (en) | 2007-03-28 |
CN1939025B (en) | 2010-12-08 |
SG133597A1 (en) | 2007-07-30 |
EP2482476A2 (en) | 2012-08-01 |
IL177085A0 (en) | 2006-12-10 |
KR20060125868A (en) | 2006-12-06 |
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