US20120155407A1 - Scheduling Data Transmissions Between a Mobile Terminal and a Base Station in a Wireless Communications Network Using Component Carriers - Google Patents

Scheduling Data Transmissions Between a Mobile Terminal and a Base Station in a Wireless Communications Network Using Component Carriers Download PDF

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Publication number
US20120155407A1
US20120155407A1 US13/378,021 US201013378021A US2012155407A1 US 20120155407 A1 US20120155407 A1 US 20120155407A1 US 201013378021 A US201013378021 A US 201013378021A US 2012155407 A1 US2012155407 A1 US 2012155407A1
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United States
Prior art keywords
mobile terminal
component carriers
base station
indicating
data transmissions
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Abandoned
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US13/378,021
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English (en)
Inventor
Bengt Lindoff
Stefan Andersson
Ylva Jading
Stefan Parkvall
Lars Sundström
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IDTP Holdings Inc
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Telefonaktiebolaget LM Ericsson AB
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Priority to US13/378,021 priority Critical patent/US20120155407A1/en
Assigned to TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JADING, YLVA, PARKVALL, STEFAN, ANDERSSON, STEFAN, LINDOFF, BENGT, SUNDSTROM, LARS
Publication of US20120155407A1 publication Critical patent/US20120155407A1/en
Assigned to IDTP HOLDINGS, INC. reassignment IDTP HOLDINGS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Abandoned legal-status Critical Current

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    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/0277—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof according to available power supply, e.g. switching off when a low battery condition is detected
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to methods and devices for scheduling data transmissions between a mobile terminal and a base station in a wireless communications network arranged for the transmission of multiple component carrier signals.
  • One approach to increasing bandwidth requirements in limited, fragmented spectrum is to aggregate non-contiguous spectrum. From a baseband point of view, this can effectively increase the system bandwidth sufficiently to support up to 1 Gb/s, a throughput requirement for 4G systems. Transmitting data in non-contiguous parts of the spectrum also introduces flexibility, as spectrum utilization may be adapted to existing spectrum use and geographical position. Additionally, different modulation and coding schemes may be advantageously applied to different portions of the spectrum.
  • a possible evolution of current cellular systems, such as the 3GPP Long Term Evolution (LTE), to support non-contiguous spectrum is to introduce multiple component carriers or multiple bands.
  • LTE Long Term Evolution
  • each separate portion of spectrum may be considered an LTE system.
  • Multi-band transmission is likely to be a principal part of the further releases of 3G LTE targeting ITU IMT-Advanced capabilities.
  • a mobile terminal for use in such a system will be capable of receiving multiple component carriers, of different bandwidths, and transmitted at different carrier frequencies.
  • US 2007/007090 discloses a multi-carrier communication system in which radio resources are distributed between a plurality of access terminals.
  • the carriers assigned to an access terminal are determined by the network based on scheduling information received from the access terminal.
  • the scheduling information may include data requirements, Quality-of-Service requirements, available transmit power headroom, the location of the access terminal, or hardware constraints associated with the access terminal. This disclosure does not relate to the use of non-contiguous bandwidths.
  • the design of a mobile terminal supporting multiple non-contiguous component carriers is non trivial task.
  • the front end radio needs to be able to suppress blocking signal in between the spectrum “chunks”.
  • Different kind of radio architecture can be used for handling this problem; however, they typically have drawbacks compared to standard contiguous system receivers in terms of current consumption. Therefore there is a need for an efficient non-contiguous multi-carrier LTE system design taking into account the challenges in the mobile terminal front end receiver design.
  • the object is achieved by using a method of scheduling data transmissions between a mobile terminal and a base station in a wireless communications network arranged for the transmission of multiple component carrier signals, each component carrier providing for the transmission of signals in a predetermined bandwidth around the carrier.
  • the method may comprise the steps of: receiving in the mobile terminal information from the base station indicating available component carriers, detecting in the mobile terminal at least one dynamic parameter indicative of the mobile terminal's current ability to handle component carriers having non-contiguous bandwidths, determining in the mobile terminal in dependence of said at least one dynamic parameter which of said available component carriers to utilize for said data transmissions and transmitting from the mobile terminal to the base station information indicating the component carriers determined to utilize for the data transmissions.
  • the mobile terminal may control the number of component carriers used, in relation to a dynamic parameter detected in the mobile terminal. By doing this the mobile terminal may choose to limit the number of component carriers used in situations where it is disadvantageous, such as situations where the power consumption of supporting multiple component carriers is high or situations where complex hardware is needed.
  • the method further comprises the step of selecting the at least one parameter from the group of parameters consisting of a parameter indicative of a charging level of a battery in the mobile terminal, a parameter indicative of a level of transmission power from the mobile terminal required to achieve a predetermined quality level of data transfer from the mobile terminal and a parameter indicative of a level of base band processing capability in the mobile terminal.
  • the mobile terminal By letting the mobile terminal control the number of component carrier to use in respect to a parameter indicative of a charging level of a battery in the mobile terminal, a longer battery lifetime may be achieved. This may be done by limiting the use of multiple component carriers when the battery charging level is low, thereby saving the power needed to support multiple component carriers. Additionally a simpler design of the mobile terminal may be used since there is no need for supporting multiple component carriers at a low battery voltage.
  • the parameter be indicative of a level of transmission power from the mobile terminal, to achieve a predetermined quality level of data transfer, a simpler design of the mobile terminal may be used, since the mobile terminal does not have to support multiple component carriers when transmitting with a high power. This may be achieved by limiting the number of component carriers used when transmitting with a high power.
  • the parameter be indicative of a level of base band processing capability in the mobile terminal a more efficient use of the processing resources in the mobile terminal may be achieved. This may be done by limiting the number of component carriers used when the processing resources in the mobile terminal is scarce.
  • the method further comprises the steps of detecting the occurrence of a component carrier event triggered by one of the parameter levels passing a predefined threshold; and performing the step of determining which component carriers to utilize when a component carrier event is detected.
  • the step of transmitting the information indicating the determined component carriers uses a Radio Resource Control, RRC, signalling protocol.
  • RRC Radio Resource Control
  • the step of transmitting the information indicating the determined component carriers uses a Medium Access Control, MAC, signalling protocol.
  • MAC Medium Access Control
  • Some embodiments of the invention relate to a mobile terminal configured to schedule data transmissions between the mobile terminal and a base station in a wireless communications network arranged for the transmission of multiple component carrier signals, each component carrier providing for the transmission of signals in a predetermined bandwidth around the carrier.
  • the mobile terminal is configured to receive information from said base station indicating available component carriers; detect at least one dynamic parameter indicative of the mobile terminal's current ability to handle component carriers having non-contiguous bandwidths; determine in dependence of said at least one dynamic parameter which of said available component carriers to utilize for said data transmissions; and transmit to said base station information indicating the component carriers determined to utilize for said data transmissions.
  • Embodiments corresponding to those mentioned above for the method also apply for the mobile terminal.
  • Some embodiments of the invention relate to a computer program and a computer readable medium with program code means for performing the method described above.
  • FIG. 1 is a frequency plot showing multiple component carriers
  • FIG. 2 is a flow diagram of a method of scheduling data transmissions between a mobile terminal and a base station
  • FIG. 3 a is a frequency plot showing the spectrum leakage when transmitting multiple component carriers with low power
  • FIG. 3 b is a frequency plot showing the spectrum leakage when transmitting multiple component carriers with high power
  • FIG. 4 is a plot showing the battery voltage as a function of the state of charge
  • FIG. 5 a is a frequency plot showing the amplitude of a low energy interference signal positioned between two component carriers prior to filtration;
  • FIG. 5 b is a frequency plot showing the amplitude of a low energy interference signal positioned between two component carriers after filtration
  • FIG. 6 a is a frequency plot showing the amplitude of a high energy interference signal positioned between two component carriers prior to filtration;
  • FIG. 6 b is a frequency plot showing the amplitude of a high energy interference signal positioned between two component carriers after filtration.
  • FIG. 7 is a functional block diagram of a mobile terminal.
  • a spectrum aggregated or multi-band system as is discussed herein, several frequency bands, contiguous or non-contiguous, may be allocated for the communication with one mobile receiver.
  • the modulation and access format within the band could be of any kind, e.g., orthogonal frequency division multiplexing (OFDM), single-carrier frequency division multiplexing (SC-FDMA), code-division multiple access (CDMA) etc.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDMA single-carrier frequency division multiplexing
  • CDMA code-division multiple access
  • FIG. 1 depicts an example of aggregation of component carriers to achieve greater bandwidth. It may be noted that the left-most component carrier is well spaced-apart in frequency to the other component carriers. It will experience, and cause, only a small amount of Inter carrier interference due to the wide carrier spacing. However, the two right most component carriers are not as well spaced apart in frequency.
  • FIG. 2 shows a flow chart of an embodiment of the present invention.
  • the mobile terminal first, in step 100 , detects a multi component carrier cell comprising a base station for communicating with the mobile terminal. This may be achieved by using a cell search procedure.
  • the mobile terminal then, in step 110 , receives information related to the component carrier possibilities of the multi component carrier cell. This information may include information related to the bandwidth and carrier frequencies, of the component carriers.
  • the number of possible component carriers may be any number, including the special case when only a single component carrier is available.
  • the mobile terminal determines a subset of the available component carriers to use for transmitting and receiving data from and to the multi component carrier cell, and informs the multi component carrier cell about this subset.
  • the choice may be based on the physical resources of the mobile terminal.
  • the subset does not have to be a proper subset, meaning that the chosen subset may include all the possible component carriers received from the multi-carrier cell.
  • the mobile terminal connects to the multi carrier cell, in step 130 , and starts to monitor for component carrier events in step 140 .
  • Such and event may be related to any dynamic parameter, such as the battery level of the mobile terminal, the transmit power of the mobile terminal, the processing load of the mobile terminal, energy of interference signals, or data transfer requirements of application on the mobile terminal.
  • the mobile terminal then, in step 150 , chooses a new subset of the available component carriers, after detection of an event and informs the multi component carrier cell about the new subset.
  • the multi component carrier cell is given the opportunity to reject the requested subset of component carriers and may instead suggest a different subset.
  • the communication between the mobile terminal and the multi-carrier cell for the purpose of configuring the multi-carriers may be achieved by using a well defined signaling protocol, for instance the Radio Resource Control (RRC) protocol, the Medium Access Control (MAC) protocol or via layer 1 signaling.
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • FIG. 3 a shows frequency leakage when transmitting with low power from a mobile terminal to a base station.
  • the transmit power level is typically chosen based on a predetermined quality level requirement. Closed power loops are commonly used to adjust the transmit power. The loops function by monitoring, in the base station, the quality level of the transmission. If the quality level drops below a predetermined threshold, a control signal is sent from the base station to the mobile terminal, which in return increases the transmit power. Reversely, If the quality rises above a predetermined threshold, the base station signals to the mobile terminal which then decreases the transmit power. Two disperse component carriers 301 , 302 are shown.
  • Nonlinearities in the transmitter and RF power amplifier result in intermodulation distortion, this leads to frequency leakage. This is especially a problem when using component carriers with a narrow bandwidth, since they have a high power density in the frequency domain, resulting in significant intermodulation distortion effects.
  • strict frequency leakage requirements apply on mobile terminals.
  • 303 shows the frequency leakage of the two component carriers 301 , 302 and 304 shows the leakage requirement of the mobile network. The frequency leakage 303 of the two component carriers 301 , 302 is below the leakage requirement 304 when the transmit power of the carriers is low.
  • FIG. 3 b shows frequency leakage when transmitting with high power from a mobile terminal to a base station.
  • Two disperse component carriers 305 , 306 are shown. They are positioned at the same frequencies as the two component carriers 301 , 302 in FIG. 3 a , however due to the increased transmit power their amplitude is higher.
  • the spectrum leakage of the two carriers 307 is now above the spectrum leakage requirement of the mobile network. Using a more linear transmitter and RF power amplifier, is a possible way to mitigate this, however highly linear components generally consumes more power and increases the complexity and cost of the mobile terminal.
  • the number of component carriers may be controlled based on the transmit power of the individual carriers.
  • One way of doing this is to decrease the number of component carriers used, when the transmit power is increased.
  • use of component carriers with a narrow bandwidth may be limited, when transmitting with high power. This will enable multi-carrier support on mobile terminals without the need of costly hardware and with reasonable power consumption.
  • FIG. 4 shows a plot of the voltage, for a typical battery used in mobile terminals, as a function of the state of charge.
  • the state of charge is varied from 0% to 100%.
  • Three distinct phases are shown, an initialization phase 401 , where the battery voltage drops a small amount, a plateau phase 402 where the battery voltage is almost unchanged, and a terminal phase 403 , where the battery voltage falls to zero.
  • the function of the mobile terminal is unaffected by the voltage changes in the initialization phase 401 and the plateau phase 402 .
  • the battery fails to support functionalities of the mobile terminal, and the mobile terminal is in the end forced to turn off. More linear transmitter blocks and in particular a more linear power amplifier are needed in a mobile terminal supporting multiple component carries, these however have a high power consumption. A mobile terminal supporting multiple component carriers will therefore cease to function relative early in the terminal phase.
  • the number of component carriers may be controlled based on the state of charge of the battery in the mobile terminal. This may be done by decreasing the number of component carriers used, when the state of charge of the battery is low, thereby achieving both multi carrier support and a long battery life time, without the need of a complex and expensive architecture in the mobile terminal.
  • the number of component carriers used may be controlled by a power management system functioning as a dynamic parameter.
  • the power management system may function by estimating the power consumption of supporting multiple component carriers and determine the number of carriers to use in relation to the estimated power consumption. This may be done by limiting the number of component carriers used when the power consumption for supporting multiple component carriers is high.
  • the state of charge of the battery in the mobile terminal may also be used as an input to the power management system. By using a power management system a longer battery life time is achieved.
  • FIG. 5 a shows a frequency plot of a low energy interference signal 502 positioned between two component carriers 501 , 502 prior to filtration in a mobile terminal.
  • 504 is a threshold showing the ability of the filters in the mobile terminal to block out interference signals. The threshold is determined by the quality of the filters in the mobile terminal.
  • the interference signal 502 has an amplitude that is lower than the threshold 504 .
  • FIG. 5 b shows a frequency plot of the same situation as depicted in FIG. 5 a , after filtration in the mobile terminal. The power of the interference signal has been minimized to an insignificant level, and a good quality of service is achieved for the two component carriers 501 , 502 .
  • FIG. 6 a shows a frequency plot of a high energy interference signal 602 positioned between two component carriers 601 , 602 prior to filtration in a mobile terminal.
  • 604 is a threshold showing the ability of the filters in the mobile terminal to block out interference signals. The amplitude of the interference is in this situation higher than the threshold 604 .
  • FIG. 6 b shows a frequency plot of the same situation as depicted in FIG. 6 a after filtration in the mobile terminal.
  • the power of the interference signal has been lowered, but it remains relative high compared to the amplitude of the two component carriers 601 , 602 resulting in a poor quality of service of the carriers. This can be corrected by using high performance filters with a higher threshold; however this will again will both increase the total power consumption and increase the overall cost of the device.
  • the number of used component carriers may be controlled based on the power of interference signals. This may be achieved by limiting the use of multi carrier components when high energy interference signals are present, thereby achieving good multi carrier support in the most common case, when no high energy interference signals are present, without the need of costly hardware to cope high energy interference signals.
  • Mobile terminals have transformed from being a simple communication tools into being a fully operational transportable computer system, providing a range of different applications such as audio and movie applications, maps, dictionaries and games.
  • This evolution has increased the need for processing power in mobile terminals.
  • Multi carrier component support further increases the overall processing load of the mobile terminal. Complicated application will therefore be processed slower when multi carrier components is used, resulting in a decreased user experience.
  • the number of component carriers used may be controlled in relation to the processing load of the mobile terminal. This can be achieved by using fewer component carriers when processing complicated application, thereby securing a faster processing of complex application and an increased user experience.
  • FIG. 7 shows a functional block diagram of a mobile terminal 701 configured to schedule data transmissions between the mobile terminal and a base station in a wireless communications network using the principles of the present invention.
  • the mobile terminal comprises an antenna 702 for communicating with the base station using RF signals.
  • the RF signals from the antenna is received in the RF block 703 and transmitted to the DET block 704 , where the mobile terminal 701 receives information from the base station indicating available component carriers.
  • the mobile terminal then in block 706 detects at least one dynamic parameter indicative of the mobile terminal's current ability to handle component carriers, where the component carriers may form a contiguous or non-contiguous bandwidth.
  • the at least one dynamic parameter detected in 706 together with the available component carriers detected in 704 are send to a control block 705 where the mobile terminal 701 determines a subset of the available component carriers to use for transmitting and receiving data from and to the base station, and informs the base station about this subset.
  • the subset does not have to be a proper subset, meaning that the chosen subset may include all the possible component carriers received from the multi-carrier cell.
  • the number of component carriers used may be determined in relation to a combination of different dynamic parameters.
  • the combination may be any combination of the following parameters; the battery level of the mobile terminal, the transmit power of the mobile terminal, the processing load of the mobile terminal, energy of interference signals, or data transfer requirements of application on the mobile terminal.
  • a mobile terminal functioning accordingly to the present invention may control the number of component carries used in respect to both the battery level is and the transmit power.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
US13/378,021 2009-06-17 2010-05-31 Scheduling Data Transmissions Between a Mobile Terminal and a Base Station in a Wireless Communications Network Using Component Carriers Abandoned US20120155407A1 (en)

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EP09162932.9A EP2265068B1 (fr) 2009-06-17 2009-06-17 Programmation de transmissions de données entre un terminal mobile et une station de base dans un réseau de communications sans fil utilisant des porteuses composantes
EP09162932.9 2009-06-17
US22119309P 2009-06-29 2009-06-29
PCT/EP2010/057533 WO2010145933A1 (fr) 2009-06-17 2010-05-31 Programmation de transmissions de données entre un terminal mobile et une station de base au moyen de porteuses multi-composants
US13/378,021 US20120155407A1 (en) 2009-06-17 2010-05-31 Scheduling Data Transmissions Between a Mobile Terminal and a Base Station in a Wireless Communications Network Using Component Carriers

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US16/891,910 Active US11133902B2 (en) 2009-06-17 2020-06-03 Scheduling data transmissions between a mobile terminal and a base station in a wireless communications network using component carriers
US17/484,745 Active 2030-06-09 US11818060B2 (en) 2009-06-17 2021-09-24 Scheduling data transmissions between a mobile terminal and a base station in a wireless communications network using component carriers

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US11133902B2 (en) 2021-09-28
WO2010145933A1 (fr) 2010-12-23
EP3182775A1 (fr) 2017-06-21
EP2265068B1 (fr) 2016-12-14
US20200295889A1 (en) 2020-09-17
US20220014321A1 (en) 2022-01-13
EP2265068A1 (fr) 2010-12-22
US11818060B2 (en) 2023-11-14
JP2012530437A (ja) 2012-11-29

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