WO2010071526A1 - Procédé et appareil dans un réseau de télécommunications - Google Patents

Procédé et appareil dans un réseau de télécommunications Download PDF

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Publication number
WO2010071526A1
WO2010071526A1 PCT/SE2008/051529 SE2008051529W WO2010071526A1 WO 2010071526 A1 WO2010071526 A1 WO 2010071526A1 SE 2008051529 W SE2008051529 W SE 2008051529W WO 2010071526 A1 WO2010071526 A1 WO 2010071526A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile terminal
external power
network node
power source
basis
Prior art date
Application number
PCT/SE2008/051529
Other languages
English (en)
Inventor
Gabor Fodor
Magnus Persson
Arne Simonsson
Anders FURUSKÄR
Magnus Frodigh
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2008/051529 priority Critical patent/WO2010071526A1/fr
Publication of WO2010071526A1 publication Critical patent/WO2010071526A1/fr

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Classifications

    • 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
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • 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
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme

Definitions

  • the present invention relates to methods, mobile terminals and network nodes in a telecommunications network.
  • the terminal battery is, and is expected to continue to be, a significant bottle neck for long standby time and high data rate transmission in telecommunications systems. Although battery capacities are improving, the terminal form factor mandates smaller batteries, and better displays, power-hungry applications, etc increase power consumption.
  • High data rates typically require a higher received energy per information bit than low data rates.
  • Low delays are associated with frequent monitoring of control channels.
  • a mobile terminal transmits a power supply status signal to the network, indicating whether or not it is connected to an external power supply.
  • the network may then use this information to adapt one or more parameters, or alter the scheduling of resources, etc. For example, if the mobile terminal is connected to an external power supply, the mobile terminal may be scheduled resources, or parameters adapted such that relatively high power consumption takes place in the mobile terminal (i.e. high transmission power is required, or more frequent monitoring of channels, etc). If the mobile terminal is not connected to an external power supply, the mobile terminal may be scheduled resources, or parameters adapted such that relatively low power consumption takes place in the mobile terminal (i.e. low transmission power is required, or less frequent monitoring of channels, etc).
  • a method in a network node of a telecommunications network comprising at least one mobile terminal.
  • the method comprises receiving from the mobile terminal a power supply status signal indicating whether the mobile terminal is connected to an external power source.
  • a network node for use in a telecommunications network, the network node comprising a transceiver and processing circuitry.
  • the transceiver is configured to receive a power supply status signal originating from a mobile terminal, the power supply status signal indicating whether the mobile terminal is connected to an external power source.
  • a mobile terminal for use in a telecommunications network comprising a network node.
  • the mobile terminal comprises a transmitter and processing circuitry.
  • the processing circuitry is configured to determine whether or not the mobile terminal is connected to an external power source, and to generate a signal a power supply status signal indicating whether the mobile terminal is connected to the external power source.
  • the transmitter is configured to transmit said power supply status signal to said network node.
  • Figure 1 shows a telecommunications network according to an embodiment of the present invention
  • Figure 2 shows a terminal according to an embodiment of the present invention
  • Figure 3 shows a radio base station according to an embodiment of the present invention
  • Figure 4 is a flowchart illustrating a method in a terminal according to an embodiment of the present invention .
  • Figure 5 is a flowchart illustrating a method in a radio base station or radio network control node according to an embodiment of the present invention.
  • FIG. 1 shows part of a telecommunications network 2 according to embodiments of the present invention.
  • the network 2 comprises a radio base station 4, which transmits signals to mobile terminals 6 in downlink communications, and receives signals transmitted by the mobile terminals 6 in uplink communications.
  • the radio base station 4 further communicates with a core network 8.
  • the communication with the core network 8 may be direct (for example as in Release 8 of the 3GPP specifications), or via a radio network controller 9 (for example as in wideband code-division multiple access, WCDMA, or in earlier releases of the 3GPP specifications).
  • the network 2 will in general comprise a plurality of radio base stations, with each radio base station transmitting to a plurality of mobile stations.
  • the functionality of the radio base station may be divided between several nodes, or performed in a central node controlling several base stations, such as a radio network controller (RNC) 9 in WCDMA or a base station control (BSC) node in GSM (global system for mobile communications).
  • RNC radio network controller
  • BSC base station control
  • GSM global system for mobile communications
  • the core network 8 in general comprises a multitude of different devices, which act to control the operation of the network 2, and to pass data, etc from one part of the network to another.
  • FIG. 2 shows a mobile terminal 6 according to embodiments of the present invention.
  • the mobile terminal may also be known as a user equipment (UE) or a mobile station.
  • UE user equipment
  • the mobile terminal comprises an antenna 10 coupled to Tx/Rx circuitry 12.
  • the Tx/Rx circuitry 12 is further coupled to processing circuitry 14.
  • the processing circuitry 14 is coupled to a memory 16, which in general includes random access memory (RAM) and also non-volatile memory.
  • RAM random access memory
  • the processing circuitry is coupled to power circuitry 18, which acts to distribute power to the mobile terminal 6.
  • the mobile terminal 6 further comprises a battery 20, for example, a lithium-ion battery, connected to the power circuitry 18.
  • the power circuitry may be selectively coupled to an external power supply 22, such as the mains electricity. This is for example to recharge the battery 20 but, whilst the battery 20 is charging or if the battery is 20 completely charged, the external power supply 22 will also power the mobile terminal 6 directly.
  • the mobile terminal may comprise a plurality of antennas, each with its own corresponding Tx/Rx circuitry, or each coupled to common Tx/Rx circuitry.
  • MIMO multiple-input multiple-output
  • the mobile terminal 6 may be a phone, or any other device comprising the necessary means for communicating with a telecommunications network, such as a computer, a laptop, a personal digital assistant, etc.
  • FIG 3 illustrates a radio base station 4 according to embodiments of the present invention.
  • the radio base station 4 may also be known as a NodeB or an evolved NodeB (ENodeB).
  • the radio base station 4 comprises an antenna 30, which is capable of receiving and transmitting signals.
  • the antenna 30 is coupled to transmitter/receiver circuitry 32 (or, more generally, transceiver circuitry), and this is in turn connected to processing circuitry 34.
  • the radio basestation 4 further comprises core network (CN) interface circuitry 36 for managing one or more interfaces with the core network 8.
  • CN core network
  • the radio base station 4 may comprise a plurality of antennas, with each connected to respective Tx/Rx circuitry, or connected to common Tx/Rx circuitry.
  • the mobile terminal 6 signals to the radio base station 4 whether or not it is connected to the external power supply 22.
  • the radio base station 4 and the core network 8 may then use this information in any of a number of ways, for example to improve the quality of signals transmitted to the mobile terminal 6, as will be described in greater detail below.
  • FIG. 4 is a flowchart illustrating a method in a mobile terminal according to embodiments of the present invention. The method begins in step 40.
  • the processing circuitry 14 of the mobile terminal in communication with the power circuitry 18, generates a power supply status signal.
  • the power supply status signal comprises an indication of whether or not the mobile terminal 6 is connected to an external power supply 22.
  • the power supply status signal may further include an indication of the status of the battery 20, such as an amount of energy remaining in the battery 20, a remaining time before the battery runs out, or a remaining percentage of the battery energy.
  • the power supply status signal may further, or alternatively, include an indication of the mobile terminal type, such as: handheld, laptop, fixed wireless or network connected. Such indications can improve the prediction of the power supply lifetime.
  • a fixed wireless terminal is powered from external resources and will never run out of power.
  • a laptop connected to external power supply can be disconnected, limiting the lifetime. When powered by battery a handheld terminal has a much longer lifetime than a laptop.
  • the power supply status signal may, for example, be a radio resource control (RRC) signal, or a non-access stratum (NAS) signal.
  • RRC radio resource control
  • NAS non-access stratum
  • step 44 the power supply status signal is passed to Tx/Rx circuitry 12 and transmitted using the antenna 10.
  • Figure 5 is a method in a radio base station according to embodiments of the present invention. The method starts in step 50.
  • the radio base station receives a power supply status signal from a mobile terminal, indicating whether or not the mobile terminal is connected to an external power supply.
  • the radio base station may perform one or more of several steps according to different embodiments of the invention. That is, the telecommunications network 2 responds appropriately to the power supply status signal.
  • the radio base station (known as an eNodeB) may determine itself the appropriate action to take — as will be described in greater detail below — and signals this action to the mobile terminal 6 if necessary.
  • the radio base station 4 may pass the power supply status signal to a radio network controller, or a base station controller, which determines the appropriate action to take, and may instruct the radio base station 4 to signal this to the mobile terminal if necessary.
  • the radio base station may adapt one or more network parameters based on the received power supply status signal; the radio base station may allocate resources to the mobile terminal according to the received power supply status signal; the radio base station may adapt one or more radio resource control parameters based on the received power supply status signal.
  • the mobile terminal is in one of a plurality of possible power states, with state transition rules defining the circumstances in which the mobile terminal moves between power states.
  • the mobile terminal may have a lower power state, where for the majority of the time it is in a "sleep" mode, waking up occasionally to check for paging messages or similar; and also a higher power state, where the mobile terminal is receiving and transmitting data.
  • WCDMA wideband code-division multiple-access
  • CELL_PCH URA_PCH (both low power consumption), CELL_FACH (intermediate power consumption), and CELL_DCH (high power consumption).
  • Release 8 of the 3GPP specifications also known as long term evolution
  • LTEJDLE low power consumption
  • LTE_ACTIVE high power consumption
  • the radio base station 4 signals to the mobile terminal 6 to change its power state. For example, if the power supply status signal indicates that the mobile terminal 6 is connected to an external power supply, the radio base station 4 may signal to the mobile terminal 6 to enter a higher power consumption power state (e.g. LTE_ACTIVE, or CELL_DCH). Conversely, if the power supply status signal indicates that the mobile terminal 6 is not connected to an external power supply, the radio base station 4 may signal to the mobile terminal 6 to enter a lower power consumption power state (e.g. LTEJDLE, or CELL_PCH).
  • a higher power consumption power state e.g. LTE_ACTIVE, or CELL_DCH
  • the radio base station 4 may signal to the mobile terminal 6 to enter a lower power consumption power state (e.g. LTEJDLE, or CELL_PCH).
  • the radio base station 4 signals to the mobile terminal 6 to adapt its rules for transitioning between the power states. For example, a mobile terminal may move from a relatively high power state to a relatively lower power state if it neither transmits nor receives data within a given time period. According to this embodiment, if the mobile terminal is connected to an external power supply, the radio base station may signal the mobile terminal to increase the length of time that must elapse before the mobile terminal transitions to the lower power state.
  • the radio base station 4 may use higher data rates for transmissions to and from the mobile terminal 6 if it is connected to an external power supply.
  • Higher data rates are associated with higher power consumption, but this is not a consideration for a terminal that is plugged into the mains electricity, for example.
  • Higher data rates may be achieved by allocating to the mobile terminal a large amount of resources (i.e. a relatively large range of frequencies and/or timeslots) for transmissions to and from the mobile terminal.
  • higher rates may also be achieved through using relatively higher-order modulation schemes, and relatively higher coding rates (larger transport formats), requiring higher transmission power compared with lower-order modulation schemes and lower coding rates, which require lower transmission power.
  • a relatively small amount of resources may be allocated, such that the terminal saves power.
  • the radio base station 4 uses resources (i.e. frequencies, timeslots, etc) associated with higher levels of interference for transmissions to and from the mobile terminal 6 if it is connected to an external power supply.
  • resources i.e. frequencies, timeslots, etc
  • terminals that are not connected to an external power supply may be allocated resources associated with lower levels of interference. Resources with lower interference require less received power to reach a certain signal quality. Accordingly, mobile terminals may save power when not connected to an external power supply.
  • the radio base station 4 controls the discontinuous reception (DRX) mode of the mobile terminal 6 according to whether or not it is connected to an external power supply.
  • the receiver circuitry in the terminal 6 can be turned off for periods of time in order to save battery resources (known as discontinuous reception (DRX)), i.e. the mobile terminal 6 enters a "sleep" period.
  • the radio base station 4 controls the length of time in which the mobile terminal 6 is asleep. This may include controlling which of a plurality of DRX states the mobile terminal 6 is in, each DRX state having a different sleep period, or adapting the length of the sleep period directly, for example.
  • the mobile terminal 6 may be controlled such that, if it is connected to an external power supply, the sleep periods are shortened compared with the sleep periods of a mobile terminal that is not connected to an external power supply.
  • the radio base station 4 selects the carrier frequency for uplink transmissions according to whether or not the mobile terminal is connected to an external power supply. That is, in this embodiment a plurality of different carrier frequencies are available to the mobile terminal 6 for transmissions to the radio base station 4.
  • the propagation properties can differ significantly between different frequency bands. Typically a signal transmitted at a lower frequency is less attenuated and needs less transmission power from the terminal to achieve a certain received power at the radio base station 4. Thus, in this instance, battery resources are saved when data is transmitted on a relatively lower frequency band. However, it may also be the case that relatively higher-frequency signals are less attenuated that lower-frequency signals, in which case transmitting at the higher frequency saves battery resources. Therefore, in one embodiment, if the mobile terminal 6 is not connected to an external power supply, it may be assigned to a carrier frequency suffering from relatively lower attenuation.
  • the radio base station 4 and the mobile terminal 6 may comprise multiple antennas such that MIMO transmissions can take place between them.
  • the radio base station 4 selects the MIMO transmission rank according to whether or not the mobile terminal is connected to an external power supply.
  • the MIMO transmission rank is the number of transmitted data streams, or parallel code words. In many cases, the higher the transmission rank the less power efficient the transmitted bits are, as there is interference between the different data streams. Therefore, in this embodiment, if the mobile terminal 6 is connected to an external power supply its MIMO transmission rank may be increased relative to the MIMO transmission rank of a mobile terminal that is not connected to an external power supply.
  • the radio base station 4 selects multi-user scheduling according to whether or not the mobile terminal 6 is connected to an external power supply. Multiple terminals may be scheduled to transmit to the radio base station 4 on the same resource (i.e. the same frequency and timeslot); this is known as multi-user MIMO, and may be used to increase the capacity in a cell by increasing the number of available radio resources. However, the transmissions on the same resource interfere with each other, and a higher transmission power is required to overcome this problem. Therefore, in this embodiment, the radio base station 4 may not schedule mobile terminals on the same uplink resource if they are not connected to an external power supply.
  • the radio base station may adapt the data rates for transmissions to and from the terminal; control the power state of the mobile terminal; adapt the rules for transitioning between power states; allocate the terminal resources with high or low interference; control the DRX mode of the terminal; adapt the scheduled bandwidth of the terminal; select the carrier frequency; select the MIMO transmission rank; and/or select multi-user MIMO scheduling.
  • the power supply status signal is user-selectable. That is, the user of the mobile terminal is allowed to disable the transmission of the power supply status signal or to alter its contents. In this way, the mobile terminal may be adapted to indicate that it is connected to an external power supply even if it is not, thus benefiting from increased data rates, etc, at the expense of emptying its battery.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un terminal mobile (6) transmet un signal d'état d'alimentation électrique à un nœud de réseau (4) appartenant à un réseau de télécommunications (2), ce signal indiquant si ledit terminal est connecté à une alimentation électrique externe. Le réseau (2) peut alors utiliser cette information pour adapter un ou plusieurs paramètres ou pour modifier la planification des ressources, etc. Par exemple, si le terminal mobile (6) est connecté à une alimentation électrique externe, ses ressources peuvent être planifiées ou ses paramètres adaptés, de manière à ce que sa consommation de puissance soit relativement élevée (ce qui nécessite une grande puissance de transmission ou une surveillance plus fréquente des canaux, etc.). Si le terminal mobile (6) n'est pas connecté à une alimentation électrique externe, ses ressources peuvent être planifiées ou ses paramètres adaptés, de manière à ce que sa consommation de puissance soit relativement faible (ce qui nécessite une puissance de transmission moindre, une surveillance moins fréquente des canaux, etc.).
PCT/SE2008/051529 2008-12-19 2008-12-19 Procédé et appareil dans un réseau de télécommunications WO2010071526A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2008/051529 WO2010071526A1 (fr) 2008-12-19 2008-12-19 Procédé et appareil dans un réseau de télécommunications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2008/051529 WO2010071526A1 (fr) 2008-12-19 2008-12-19 Procédé et appareil dans un réseau de télécommunications

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2989815A1 (fr) * 2013-04-23 2016-03-02 Qualcomm Incorporated Systèmes et procédés d'identification dans un réseau sensible au voisinage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060203772A1 (en) * 2005-03-08 2006-09-14 Rajiv Laroia Methods and apparatus for implementing and using a maximum rate option indicator
US20070223438A1 (en) * 2006-03-22 2007-09-27 Broadcom Corporation, A California Corporation Cell network using friendly relay communication exchanges

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060203772A1 (en) * 2005-03-08 2006-09-14 Rajiv Laroia Methods and apparatus for implementing and using a maximum rate option indicator
US20070223438A1 (en) * 2006-03-22 2007-09-27 Broadcom Corporation, A California Corporation Cell network using friendly relay communication exchanges

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VODAFONE GROUP: "Introduction of battery-limited device indication in UE capability", 3GPP DRAFT; R2-052285, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. London, UK; 20050902, 2 September 2005 (2005-09-02), XP050129348 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2989815A1 (fr) * 2013-04-23 2016-03-02 Qualcomm Incorporated Systèmes et procédés d'identification dans un réseau sensible au voisinage
EP2989815B1 (fr) * 2013-04-23 2021-05-26 Qualcomm Incorporated Systèmes et procédés d'identification dans un réseau sensible au voisinage

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