WO2006051256A1 - A method of controlling one or more terminals from a base station - Google Patents

A method of controlling one or more terminals from a base station Download PDF

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Publication number
WO2006051256A1
WO2006051256A1 PCT/GB2005/004018 GB2005004018W WO2006051256A1 WO 2006051256 A1 WO2006051256 A1 WO 2006051256A1 GB 2005004018 W GB2005004018 W GB 2005004018W WO 2006051256 A1 WO2006051256 A1 WO 2006051256A1
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WO
WIPO (PCT)
Prior art keywords
scheduling command
terminal
identifier
scheduling
base station
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/GB2005/004018
Other languages
French (fr)
Inventor
Philip Booker
Thomas Malcolm Chapman
Jörn KRAUSE
Toby Kier Proctor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PL05801340T priority Critical patent/PL1810452T3/en
Priority to US11/667,454 priority patent/US8238892B2/en
Priority to AT05801340T priority patent/ATE515918T1/en
Priority to EP05801340A priority patent/EP1810452B1/en
Publication of WO2006051256A1 publication Critical patent/WO2006051256A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • This invention relates to a method of controlling one or more terminals from a base station.
  • UMTS universal mobile telecommunication system
  • UE user equipment
  • Node B by the Node B scheduling the interference
  • HARQ hybrid automatic repeat request
  • ACK acknowledgements
  • NACK non- acknowledgements
  • TTI transmission time interval
  • a method of controlling one or more terminals from a base station comprises setting one or more identifiers for each terminal; allocating a priority ranking to each identifier to determine priority of one scheduling command relative to any other scheduling command; and transmitting a data block from the base station to the, or each, terminal, including the scheduling command and at least one identifier; wherein each terminal indicated by the identifier adapts its power level or data rate in accordance with the scheduling command.
  • each scheduling command includes a validity period.
  • the default value could be one which is preset for all terminals, but preferably, each terminal indicated by an identifier in a scheduling command reverts to the power level and data rate of its lowest priority identifier, on expiry of the validity period of that scheduling command.
  • Certain terminals may have a need for a higher basic power level and data rate, so this can be set individually, as the lowest priority identifier.
  • the terminal could respond substantially instantaneously to a change indicated by a scheduling command, but preferably, each terminal indicated by an identifier in a new scheduling command changes its power level or data rate in accordance with the new scheduling command, only when a validity period for a previous scheduling command for that terminal expires.
  • the scheduling command could set a relative change, such as increase or decrease power by a fixed amount, preferably, the scheduling command sets an absolute power level or data rate.
  • the terminal could be a static terminal, but preferably, the terminal comprises a mobile terminal.
  • the identifiers for a terminal in soft handover are identifiers from different base stations and their relative priorities.
  • the terminal may receive scheduling information from more than one base station, so it needs to know which takes precedence.
  • Figure 1 is a block diagram of a first example of the present invention
  • Figure 2 shows the invention applied during soft handover
  • Figure 3 illustrates how priorities are allocated and used according to the present invention.
  • a node B NB schedules a pair of terminals UEl and UE2, typically mobile terminals within a cell. If UEl is causing interference, the node B can send a scheduling command to UEl which reduces its data rate and power level to the specified lower ones, without affecting UE2. Alternatively, if NB has spare resources it can send a command, indicating to both UEl and UE2 that they can increase their power levels and data rate to the same, higher, value.
  • Fig. 2 illustrates the problem of soft handover, where terminals Tl and T3
  • O might receive scheduling commands from both NBl and NB2.
  • the terminals will be given an identifier and priority ranking, so that they know which node B to follow.
  • An absolute scheduling grant indicates an absolute setting of UL transmit power limit or UL transport format limit
  • a relative scheduling grant gives an up or hold or down command for setting UL transmit power limit or UL transport format limit.
  • a corresponding scheduling identification is sent together with the command to indicate the UE to which the scheduling grant applies.
  • the scheduling grants can affect an individual UE (individual scheduling identification), a configured group of UEs ('group scheduling identification'), or all UEs which are under control of the scheduling Node B ('common scheduling identification').
  • the UE receives configuration information (e.g. when the E-DCH channel is set up or reconfigured) in which a prioritized list of scheduling identifications is provided to indicate which scheduling identification has a higher priority, if the UE has or receives different grants with overlapping validity periods.
  • the absolute grants may remain valid until the next absolute grant occurs, rather than being given a specific validity period.
  • One example of using a list of prioritised UE IDs is one in which one of the IDs is used for scheduling a group of UEs. All of the UEs in the group are given a common ID as one of their UE IDs and individual Ids as another of their UE IDs. Their behaviour on receiving an absolute grant containing a UE ID will differ depending on whether the grant contains the common ID or an individual ID and the priority of the common/individual IDs.
  • a UE e.g. UEl is allocated 2 IDs with different priorities. The higher priority is UEIDl and the lower priority is UEID2, i.e. IDl has a higher priority than ID2.
  • the UE receives an absolute grant for UEIDl, which has priority 1, so the UE responds. It also receives an absolute grant for UEID2, with priority 2, but the UE does not respond to this because it already has a valid grant with a higher priority number.
  • Advantages of the proposed invention include a reduction and simplification of scheduling grants.
  • a group or all UEs can be addressed by one grant only which is quicker in overload situations and saves downlink power and radio resources in general.
  • the scheduler in the Node B is implementation specific, corresponding signalling for the configuration is needed in the standard and cost savings in the sense of radio resources can be achieved.

Landscapes

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

Abstract

A method of controlling one or more terminals (UE1, UE2) from a base station (NB) comprises setting one or more identifiers (UEID1, UEID2) for each terminal and allocating a priority ranking to each identifier to determine priority of one scheduling command relative to any other scheduling command. A data block is transmitted from the base station to the, or each, terminal, including the scheduling command and at least one identifier. Each terminal indicated by the identifier adapts its power level or data rate in accordance with the scheduling command.

Description

A METHOD OF CONTROLLING ONE OR MORE TERMINALS FROM A BASE
STATION
This invention relates to a method of controlling one or more terminals from a base station.
In the third generation partnership project (3GPP) work is ongoing relating to enhanced uplink (or enhanced dedicated channel (E-DCH)) for frequency division duplex (FDD). Improvements provide a feature for universal mobile telecommunication system (UMTS) that enhances uplink (UL) transmissions from the mobile station or user equipment (UE) to the base station, or Node B by the Node B scheduling the interference, transmit power received at the Node B and transport formats used. These three parameters are coupled. Furthermore, a hybrid automatic repeat request (HARQ) mechanism sends acknowledgements (ACK) or non- acknowledgements (NACK) from a Node B, or in case of soft handover, more than one Node B, to the UE to trigger retransmissions. There is also some consideration of implementing a shorter transmission time interval (TTI) of 2ms, rather than a 10ms TTI which is more usually considered to be standard. The effect of all these changes is to improve coverage and throughput, as well as to reduce delay in the UL.
However, it is necessary to provide a way of scheduling commands from the base station to the terminal.
In accordance with a first aspect of the present invention, a method of controlling one or more terminals from a base station comprises setting one or more identifiers for each terminal; allocating a priority ranking to each identifier to determine priority of one scheduling command relative to any other scheduling command; and transmitting a data block from the base station to the, or each, terminal, including the scheduling command and at least one identifier; wherein each terminal indicated by the identifier adapts its power level or data rate in accordance with the scheduling command.
This ensures that changes in power level or data rate of a terminal can be controlled without having to apply the same changes to all terminals.
Preferably, each scheduling command includes a validity period.
This reduces the need for the base station to send commands, because the terminal will automatically revert to a default value on expiry of the validity period. The default value could be one which is preset for all terminals, but preferably, each terminal indicated by an identifier in a scheduling command reverts to the power level and data rate of its lowest priority identifier, on expiry of the validity period of that scheduling command.
Certain terminals may have a need for a higher basic power level and data rate, so this can be set individually, as the lowest priority identifier.
The terminal could respond substantially instantaneously to a change indicated by a scheduling command, but preferably, each terminal indicated by an identifier in a new scheduling command changes its power level or data rate in accordance with the new scheduling command, only when a validity period for a previous scheduling command for that terminal expires.
This allows the base station to plan ahead in terms of resources.
Although the scheduling command could set a relative change, such as increase or decrease power by a fixed amount, preferably, the scheduling command sets an absolute power level or data rate.
The terminal could be a static terminal, but preferably, the terminal comprises a mobile terminal.
Preferably, the identifiers for a terminal in soft handover are identifiers from different base stations and their relative priorities.
When in soft handover, the terminal may receive scheduling information from more than one base station, so it needs to know which takes precedence.
A method of scheduling one or more terminals from a base station will now be described, with reference to the accompanying drawings in which: Figure 1 is a block diagram of a first example of the present invention;
Figure 2 shows the invention applied during soft handover; and
Figure 3 illustrates how priorities are allocated and used according to the present invention.
In Fig. 1, a node B NB schedules a pair of terminals UEl and UE2, typically mobile terminals within a cell. If UEl is causing interference, the node B can send a scheduling command to UEl which reduces its data rate and power level to the specified lower ones, without affecting UE2. Alternatively, if NB has spare resources it can send a command, indicating to both UEl and UE2 that they can increase their power levels and data rate to the same, higher, value.
Fig. 2 illustrates the problem of soft handover, where terminals Tl and T3
O might receive scheduling commands from both NBl and NB2. Using the method of the present invention, the terminals will be given an identifier and priority ranking, so that they know which node B to follow.
Different ways of scheduling commands, or grants, sent from the Node B to the UE are possible. An absolute scheduling grant indicates an absolute setting of UL transmit power limit or UL transport format limit, whereas a relative scheduling grant gives an up or hold or down command for setting UL transmit power limit or UL transport format limit.
For the absolute scheduling grant, a corresponding scheduling identification, currently called UE Id, is sent together with the command to indicate the UE to which the scheduling grant applies. The scheduling grants can affect an individual UE (individual scheduling identification), a configured group of UEs ('group scheduling identification'), or all UEs which are under control of the scheduling Node B ('common scheduling identification'). Thus, there is a hierarchical scheduling identification giving different levels of grants. The UE receives configuration information (e.g. when the E-DCH channel is set up or reconfigured) in which a prioritized list of scheduling identifications is provided to indicate which scheduling identification has a higher priority, if the UE has or receives different grants with overlapping validity periods. Alternatively, the absolute grants may remain valid until the next absolute grant occurs, rather than being given a specific validity period.
One example of using a list of prioritised UE IDs is one in which one of the IDs is used for scheduling a group of UEs. All of the UEs in the group are given a common ID as one of their UE IDs and individual Ids as another of their UE IDs. Their behaviour on receiving an absolute grant containing a UE ID will differ depending on whether the grant contains the common ID or an individual ID and the priority of the common/individual IDs. In Fig. 3, a UE, e.g. UEl is allocated 2 IDs with different priorities. The higher priority is UEIDl and the lower priority is UEID2, i.e. IDl has a higher priority than ID2. The UE receives an absolute grant for UEIDl, which has priority 1, so the UE responds. It also receives an absolute grant for UEID2, with priority 2, but the UE does not respond to this because it already has a valid grant with a higher priority number.
The present discussion assumes that absolute scheduling grants are received only from the serving Node B and relative grants from all cells/Node Bs. Hence non- serving Node Bs could stop interference increasing absolute grants from serving cell/Node B e.g. by an overload indication provided via their relative grants.
Advantages of the proposed invention include a reduction and simplification of scheduling grants. A group or all UEs can be addressed by one grant only which is quicker in overload situations and saves downlink power and radio resources in general. Although the scheduler in the Node B is implementation specific, corresponding signalling for the configuration is needed in the standard and cost savings in the sense of radio resources can be achieved.

Claims

1. A method of controlling one or more terminals from a base station, the method comprising setting one or more identifiers for each terminal; allocating a priority ranking to each identifier to determine priority of one scheduling command relative to any other scheduling command; and transmitting a data block from the base station to the, or each, terminal, including the scheduling command and at least one identifier; wherein each terminal indicated by the identifier adapts its power level or data rate in accordance with the scheduling command.
2. A method according to claim 1 , wherein each scheduling command includes a validity period.
3. A method according to claim 2, wherein each terminal indicated by an identifier in a scheduling command reverts to the power level and data rate of its lowest priority identifier, on expiry of the validity period of that scheduling command.
4. A method according to claim 2, wherein each terminal indicated by an identifier in a new scheduling command changes its power level or data rate in accordance with the new scheduling command, only when a validity period for a previous scheduling command for that terminal expires.
5. A method according to any preceding claim, wherein the scheduling command sets an absolute power level or data rate.
6. A method according to any preceding claim, wherein the terminal is a mobile terminal.
7. A method according to claim 6, wherein the identifiers for a terminal in soft handover are identifiers from different base stations and their relative priorities.
PCT/GB2005/004018 2004-11-10 2005-10-19 A method of controlling one or more terminals from a base station Ceased WO2006051256A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL05801340T PL1810452T3 (en) 2004-11-10 2005-10-19 A method of controlling one or more terminals from a base station
US11/667,454 US8238892B2 (en) 2004-11-10 2005-10-19 Method of controlling at least one terminal from a base station
AT05801340T ATE515918T1 (en) 2004-11-10 2005-10-19 METHOD FOR CONTROLLING ONE OR MORE TERMINAL DEVICES FROM A BASE STATION
EP05801340A EP1810452B1 (en) 2004-11-10 2005-10-19 A method of controlling one or more terminals from a base station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0424779A GB2420247B (en) 2004-11-10 2004-11-10 A method of scheduling one or more terminals from a base station
GB0424779.7 2004-11-10

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WO2006051256A1 true WO2006051256A1 (en) 2006-05-18

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EP (1) EP1810452B1 (en)
AR (1) AR051666A1 (en)
AT (1) ATE515918T1 (en)
ES (1) ES2369232T3 (en)
GB (1) GB2420247B (en)
PL (1) PL1810452T3 (en)
WO (1) WO2006051256A1 (en)

Cited By (2)

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WO2006117758A1 (en) * 2005-05-04 2006-11-09 Koninklijke Philips Electronics N.V. Scheduling of uplink data transmission using different ue-ids
CN101848493A (en) * 2009-03-25 2010-09-29 大唐移动通信设备有限公司 Uplink scheduling cache determining method and base station

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CN101848493A (en) * 2009-03-25 2010-09-29 大唐移动通信设备有限公司 Uplink scheduling cache determining method and base station

Also Published As

Publication number Publication date
AR051666A1 (en) 2007-01-31
GB2420247A (en) 2006-05-17
ATE515918T1 (en) 2011-07-15
GB0424779D0 (en) 2004-12-08
ES2369232T3 (en) 2011-11-28
GB2420247B (en) 2008-02-27
US20080248760A1 (en) 2008-10-09
PL1810452T3 (en) 2011-12-30
EP1810452A1 (en) 2007-07-25
US8238892B2 (en) 2012-08-07
EP1810452B1 (en) 2011-07-06

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