WO2006016776A2 - Uplink transmission power control in wireless communication system - Google Patents

Uplink transmission power control in wireless communication system Download PDF

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Publication number
WO2006016776A2
WO2006016776A2 PCT/KR2005/002608 KR2005002608W WO2006016776A2 WO 2006016776 A2 WO2006016776 A2 WO 2006016776A2 KR 2005002608 W KR2005002608 W KR 2005002608W WO 2006016776 A2 WO2006016776 A2 WO 2006016776A2
Authority
WO
WIPO (PCT)
Prior art keywords
network
power level
transmission power
data rate
transmission
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/KR2005/002608
Other languages
French (fr)
Other versions
WO2006016776A3 (en
Inventor
Bong Hoe Kim
Joon Kui Ahn
Hak Seong Kim
Dong Wook Roh
Dong Youn Seo
Seung Hwan Won
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Priority to CN2005800272927A priority Critical patent/CN101002403B/en
Priority to EP05771061.8A priority patent/EP1776776B1/en
Priority to JP2007525542A priority patent/JP4745339B2/en
Publication of WO2006016776A2 publication Critical patent/WO2006016776A2/en
Publication of WO2006016776A3 publication Critical patent/WO2006016776A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • 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]
    • H04W52/38—TPC being performed in particular situations
    • 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]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • 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]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/44—TPC being performed in particular situations in connection with interruption of transmission

Definitions

  • the present invention relates generally to a
  • Node-B scheduling is a process in which a node-B
  • UEs user equipments
  • node-B transmits a command for limiting uplink packet
  • TTI transmission time interval
  • ROT rise over thermal
  • a UE may be in a soft handover between two or more
  • One of the node-Bs may provide a scheduling command
  • the node-B providing the
  • scheduling command is referred to as a scheduling node-B of
  • a node-B in communication with the UE is a node-B in communication with the UE.
  • node-B is referred to as a non-scheduled UE of the node-B.
  • a scheduling node-B may be unable to determine
  • the scheduling node-B may be any scheduling node. Therefore, the scheduling node-B may be any scheduling node. Therefore, the scheduling node-B may be any scheduling node.
  • commands include a ⁇ Down' command for reducing the uplink
  • the UE reduces its uplink transmission
  • the UE increases or
  • node-B may transmit Down/None commands to individual non-
  • scheduled UEs of the node-B may broadcast
  • FIG. 1 is a diagram illustrating a related art
  • the UE receives a None command from its non-scheduling node-B that indicates no specific operation, the UE increases or
  • the non-scheduling node-B transmits a Down command to the UE
  • the UE decreases the transmission power
  • the scheduling node-B attempts scheduling of the UE to
  • B repeatedly increases and decreases (e.g., oscillates) .
  • the interference to the non- scheduling node-B may not be maintained at a desired level
  • the present invention is directed to
  • An object of the present invention is to provide
  • first transmission mode comprising a first transmission power
  • the method also comprises
  • the second transmission mode comprises a second
  • method also comprises maintaining the second transmission
  • the first network may comprise a serving network and the second network- comprises a non-serving
  • the second transmission power level may be lower
  • the second data rate is less than the first transmission power level.
  • the first change may be lower than the first data rate.
  • command may be associated with decreasing at least one of
  • the first change command may be included in a scheduling
  • the user equipment may decrease at least one of
  • the predetermined time may be received from the first
  • first transmission mode comprising a first transmission power
  • the method also comprises
  • the second transmission mode comprises a second
  • method also comprises maintaining the second transmission
  • the second transmission mode comprises a second
  • first transmission mode comprising a first transmission power
  • the method also comprises
  • the transmission mode comprises a second
  • the first network to increase at least one of transmission
  • FIG. 1 is a diagram illustrating a related art
  • FIG. 2 is a diagram illustrating a node-B
  • FIG. 3 is a diagram illustrating a node-B
  • FIG. 4 is a diagram illustrating a method for
  • a UE may be in a soft handover between two or more
  • One of the node-Bs may provide a scheduling command
  • the node-B providing the
  • scheduling command is referred to as a scheduling node-B of
  • a node-B in communication with the UE is a node-B in communication with the UE.
  • node-B it should be understood that node-B
  • FIG. 2 is a diagram illustrating a node-B
  • the non-scheduled UE reduces
  • period of time e.g., N ⁇ ee p slots or TTIs (transmission time
  • the predetermined period of time may, for
  • period of time may be known by the UE.
  • the transmission power level and/or transmission data rate are the transmission power level and/or transmission data rate
  • the UE does not increase the transmission .power level and/or
  • the UE may perform an operation
  • the UE may operate as described
  • the UE reduces its transmission power level and/or
  • FIG. 3 is a diagram illustrating a node-B
  • a node-B transmits or
  • the Down command indicates 'transmission
  • command is another command that is another command that
  • the UE decreases its transmission power
  • the UE increases or
  • the UE keeps the current transmission power level and/or
  • the UE reduces its transmission
  • node-Bs regardless of commands received from other non-
  • the UE keeps
  • FIG. 4 is a diagram illustrating a method for
  • commands may be transmitted from the non-scheduling node-B.
  • Down/Keep/None commands may be employed in which there is no None command transmitted. This exemplary modulation
  • DTX discontinuous transmission
  • the non-scheduling node-B transmits
  • the node-B does not directly implement a
  • node-B passes the received command to the scheduling node-B.
  • the scheduling node-B determines whether to keep or decrease
  • the uplink transmission power level and/or transmission data are the uplink transmission power level and/or transmission data
  • the UE may pass a Down command
  • the UE may pass a
  • wireless communication system comprises communicating with a
  • the method also comprises receiving a first change
  • second transmission mode comprises a second transmission
  • the method also comprises
  • the method also comprises maintaining the second transmission mode for
  • the first network may comprise a serving network
  • the second network comprises a non-serving network.
  • second transmission power level may be lower than the first
  • the second data rate may be lower
  • the first change command may be
  • the user equipment may decrease at least one of
  • the predetermined time may be received from the first
  • the method also comprises entering the second
  • the method also comprises maintaining the
  • first network to decrease at least one of transmission power level and data rate.
  • first transmission mode comprising a first transmission power
  • the method also comprises
  • second transmission mode comprises a second transmission
  • the method also comprises
  • the second transmission mode comprises a second
  • the first network to increase at least one of transmission
  • the node-B scheduling method may be applied to control
  • the present invention may provide control of
  • the present invention can be applied to a

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

Abstract

A method of controlling uplink transmission of a user equipment in a soft handover mode in a wireless communication system comprises communicating with a first network and a second network, at a first transmission mode comprising a first transmission power level and a first data rate. The method also comprises receiving a first change command from the second network to change the first transmission mode to a second transmission mode, wherein the second transmission mode comprises a second transmission power level and a second data rate. The method also comprises entering the second transmission mode. The method also comprises maintaining the second transmission mode for a predetermined time period regardless of a second change command from the first network to increase at least one of transmission power level and data rate of the user equipment.

Description

[DESCRIPTION]
UPLINK TRANSMISSION POWER CONTROL IN WIRELESS COMMUNICATION
SYSTEM
TECHNICAL FIELD
[0001] The present invention relates generally to a
wireless communication system and, more particularly, to
uplink transmission power control in a wireless communication
system.
BACKGROUND ART
[0002] Node-B scheduling is a process in which a node-B
controls uplink transmissions of user equipments (UEs)
present in a cell controlled by the node-B when the UEs
transmit packets in the uplink. The control by the node-B is
in real time. Such control may more efficiently utilize
uplink resources and improve cell throughput and capacity.
[0003] In a related art node-B scheduling method, the
node-B transmits a command for limiting uplink packet
transmission power level or transmission data rate of the UEs
at each transmission time interval (TTI) . This limitation
allows rise over thermal (ROT) in the cell to be maintained at an appropriate level.
[0004] A UE may be in a soft handover between two or more
node-Bs. One of the node-Bs may provide a scheduling command
pertaining to the uplink transmission power level or
transmission data rate of the UE. The node-B providing the
scheduling command is referred to as a scheduling node-B of
the UE. Conversely, a node-B in communication with the UE
during handover that does not provide a scheduling command
pertaining to the UE is referred to as a non-scheduling node-
B of the UE.
[0005] A UE in soft handover with a node-B and receiving
a scheduling command from the scheduling node-B is referred
to as a scheduled UE of the node-B. Conversely, a UE in soft
handover with a node-B receiving no scheduling command of the
node-B is referred to as a non-scheduled UE of the node-B.
[0006] A scheduling node-B may be unable to determine
interference caused by a scheduled UE to neighboring non-
scheduling nodes. Therefore, the scheduling node-B may be
unable to account for the interference to the neighboring
cells in scheduling the scheduled UE. Therefore, the node-B
may be unable to control the interference caused by its
scheduled UEs, even in cases of excessive interference. [0007] One proposal for limiting the interference
involves a node-B transmitting uplink transmission power
level or transmission data rate reduction commands to non-
scheduled UEs of the node-B in the downlink. The reduction
commands include a λDown' command for reducing the uplink
transmission power level or transmission data rate and a
'None' command to indicate that no specific operation is
required. When the UE receives a Down command from the non-
scheduling node-B, the UE reduces its uplink transmission
power level or transmission data rate to a specific level,
regardless of a scheduling command received from the
scheduling node-B. Conversely, when the UE receives a None
command indicating no specific operation, the UE increases or
decreases its transmission power level or transmission data
rate according to a command from the scheduling node-B. The
node-B may transmit Down/None commands to individual non-
scheduled UEs of the node-B or, alternatively, may broadcast
Down/None commands to all non-scheduled UEs of the node-B.
[0008] FIG. 1 is a diagram illustrating a related art
node-B scheduling method.
[0009] Referring to FIG. 1, in a time interval in which a
UE receives a None command from its non-scheduling node-B that indicates no specific operation, the UE increases or
decreases its uplink transmission power level or transmission
data rate according to a command from its scheduling node-B.
The non-scheduling node-B transmits a Down command to the UE
if the interference to the non-scheduling node-B rises above
a certain level as the UE increases the transmission power
level or transmission data rate according to the scheduling
command from the scheduling node-B.
[0010] Upon receiving a Down command from the non-
scheduling node-B, the UE decreases the transmission power
level or transmission data rate to a specific level,
regardless of the scheduling command from the scheduling
node-B. If the uplink transmission power level or
transmission data rate of the UE drops below the scheduled
rate, the scheduling node-B attempts scheduling of the UE to
raise the transmission power level or transmission data rate
back to a desired level. As a result, the interference to
the non-scheduling node-B increases, causing the non-
scheduling node-B to retransmit a Down command. As this
process repeats, the interference to the non-scheduling node-
B repeatedly increases and decreases (e.g., oscillates) .
[0011] Accordingly, the interference to the non- scheduling node-B may not be maintained at a desired level,
causing difficulty for the non-scheduling node-B to perform
appropriate scheduling of its scheduled UEs. Furthermore, it
may be difficult for each scheduling node-B to properly
schedule its UEs, since uplink ROT caused by UEs in soft
handover greatly varies.
DISCLOSURES OF THE INVENTION
[0012] Accordingly, the present invention is directed to
uplink transmission power control that substantially obviates
one or more problems due to limitations and disadvantages of
the related art.
[0013] An object of the present invention is to provide
uplink transmission power control to prevent a user equipment
(UE) from causing excessive interference to a node-B when
performing a handover.
[0014] Additional advantages, objects, and features of
the invention will be set forth in part in the description
which follows and in part will become apparent to those
having ordinary skill in the art upon examination of the
following or may be learned from practice of the invention.
The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed
out in the written description and claims hereof as well as
the appended drawings.
[0015] To achieve these objects and other advantages and
in accordance with the purpose of the invention, as embodied
and broadly described herein, in one embodiment, a method of
controlling uplink transmission of a user equipment in a soft
handover mode in a wireless communication system comprises
communicating with a first network and a second network, at a
first transmission mode comprising a first transmission power
level and a first data rate. The method also comprises
receiving a first change command from the second network to
change the first transmission mode to a second transmission
mode, wherein the second transmission mode comprises a second
transmission power level and a second data rate. The method
also comprises entering the second transmission mode. The
method also comprises maintaining the second transmission
mode for a predetermined time period regardless of a second
change command from the first network to increase at least
one of transmission power level and data rate of the user
equipment.
[0016] The first network may comprise a serving network and the second network- comprises a non-serving
network. The second transmission power level may be lower
than the first transmission power level. The second data rate
may be lower than the first data rate. The first change
command may be associated with decreasing at least one of
transmission power level and data rate of the user equipment.
The first change command may be included in a scheduling
command from the second network.
[0017] In the step of maintaining the second transmission
mode, the user equipment may decrease at least one of
transmission power level and data rate if another change
command is received from one of the first and second networks
to decrease at least one of transmission power level and data
rate. The predetermined time may be received from the first
network.
[0018] In another embodiment, a method of controlling
uplink transmission of a user equipment in a soft handover
mode in a wireless communication system comprises
communicating with a first network and a second network, at a
first transmission mode comprising a first transmission power
level and a first data rate. The method also comprises
receiving a first change command from the second network to change the first transmission mode to a second transmission
mode, wherein the second transmission mode comprises a second
transmission power level and a second data rate. The method
also comprises entering the second transmission mode. The
method also comprises maintaining the second transmission
mode while a maintain command is received from the second
network regardless of a second change command from the first
network to increase at least one of transmission power level
and data rate of the user equipment.
[0019] The first change command and the maintain command
may be represented by a scheduling command from the second
network. The maintain command and the first change command
may be modulated to have opposite polarities. In the step of
maintaining the second transmission mode, the user equipment
may decrease at least one of transmission power level and
data rate if another change command is received from the
first network to decrease at least one of transmission power
level and data rate.
[0020] In yet another embodiment, a method of controlling
uplink transmission of a user equipment in a soft handover
mode in a wireless communication system comprises
communicating with a first network and a second network, at a first transmission mode comprising a first
transmission power level and a first data rate. The method
also comprises transmitting a first change command to cause
the user equipment from the second network to change the
first transmission mode to a second transmission mode,
wherein the second transmission mode comprises a second
transmission power level and a second data rate. The method
also comprises transmitting a maintain command to the user
equipment to cause the user equipment to maintain the second
transmission mode for a predetermined time period regardless
of a second change command from the first network to increase
at least one of transmission power level and data rate of the
user equipment.
[0021] In still another embodiment, a method of
controlling uplink transmission of a user equipment in a soft
handover mode in a wireless communication system comprises
communicating with a first network and a second network, at a
first transmission mode comprising a first transmission power
level and a first data rate. The method also comprises
transmitting a first change command to cause the user
equipment from the second network to change the first
transmission mode to a second transmission mode, wherein the second transmission mode comprises a second
transmission power level and a second data rate. The method
also comprises transmitting a maintain command to the user
equipment to cause the user equipment to maintain the second
transmission mode regardless of a second change command from
the first network to increase at least one of transmission
power level and data rate of the user equipment.
[0022] The foregoing and other objects, features, aspects
and advantages of the present invention will become more
apparent from the following detailed description of the
present invention when taken in conjunction with the
accompanying drawings. It is to be understood that both the
foregoing general description and the following detailed
description of the present invention are exemplary and
explanatory and are intended to provide further explanation
of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings, which are included to
provide a further understanding of the invention and are
incorporated in and constitute a part of this application,
illustrate embodiments of the invention and together with the description serve to explain the principles of the
invention.
[0024] FIG. 1 is a diagram illustrating a related art
node-B scheduling method.
[0025] FIG. 2 is a diagram illustrating a node-B
scheduling method, according to an embodiment of the present
invention.
[0026] FIG. 3 is a diagram illustrating a node-B
scheduling method, according to another embodiment of the
present invention.
[0027] FIG. 4 is a diagram illustrating a method for
modulating node-B scheduling control commands, according to
an embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0028] Reference will now be made in detail to the
preferred embodiments of the present invention, examples of
which are illustrated in the accompanying drawings. Wherever
possible, the same reference numbers will be used throughout
the drawings to refer to the same or like parts.
[0029] A UE may be in a soft handover between two or more
node-Bs. One of the node-Bs may provide a scheduling command
pertaining to the uplink transmission power level and/or
transmission data rate of the UE. The node-B providing the
scheduling command is referred to as a scheduling node-B of
the UE. Conversely, a node-B in communication with the UE
during handover that does not provide a scheduling command
pertaining to the UE is referred to as a non-scheduling node-
B of the UE.
[0030] Although the present invention is described using
the term node-B, it should be understood that node-B
represents any fixed base station or network in communication
with UEs.
[0031] A UE in soft handover with a node-B and receiving
a scheduling command from the scheduling node-B is referred
to as a scheduled UE of the node-B. Conversely, a UE in soft handover with a node-B receiving no scheduling
command of the node-B is referred to as a non-scheduled UE of
the node-B.
[0032] FIG. 2 is a diagram illustrating a node-B
scheduling method, according to an embodiment of the present
invention.
[0033] Referring to FIG. 2, the non-scheduling node-B
transmits or broadcasts 'Down' / 'None' commands to its non-
scheduled UEs. When the non-scheduling node-B issues a
transmission power level and/or transmission data rate Down
command to its non-scheduled UE, the non-scheduled UE reduces
its transmission power level and/or transmission data rate to
a specific level and does not increase the transmission power
level and/or transmission data rate for a predetermined
period of time (e.g., N^eep slots or TTIs (transmission time
intervals) ) . The predetermined period of time may, for
example, originate in an upper layer of the network and be
communicated to the UE. Alternatively, the predetermined
period of time may be known by the UE.
[0034] During the Nkeep slots or TTIs after the UE receives
the transmission power level and/or transmission data rate
Down command from its non-scheduling node-B and reduces the transmission power level and/or transmission data rate,
the UE does not increase the transmission .power level and/or
transmission data rate even when the UE receives a scheduling
command from its scheduling node-B requesting the UE to
increase the transmission power level and/or transmission
data rate. However, the UE may perform an operation
corresponding to a transmission power level and/or
transmission data rate Down command from its scheduling node-
B.
[0035] When the non-scheduling node-B issues a None
command to the UE after the Nkeep slots or TTIs, the UE
increases or decreases its transmission power level and/or
transmission data rate according to a scheduling command
received from the scheduling node-B.
[0036] In an event that there are a plurality of non-
scheduling node-Bs for a UE, the UE may operate as described
above when receiving a Down command from one of the plurality
of non-scheduling node-Bs. For example, when receiving a Down
command from one of the plurality of non-scheduling node-Bs,
the UE reduces its transmission power level and/or
transmission data rate to a specific level and does not
increase the transmission power level and/or transmission data rate during Nkeep slots or TTIs after the receipt of the
Down command.
[0037] FIG. 3 is a diagram illustrating a node-B
scheduling method, according to another embodiment of the
present invention.
[0038] Referring to FIG. 3, a node-B transmits or
broadcasts ΛDown' / ΛNone' / λKeepf commands to its non-
scheduled UEs. The Down command indicates 'transmission
power level and/or transmission data rate reduction' . The
None command indicates 'no specific command' . A λKeep'
command, as described further below, is another command that
may be transmitted from the non-scheduling node-B.
[0039] Upon receiving a Down command from its non-
scheduling node-B, the UE decreases its transmission power
level and/or transmission data rate to a specific level,
regardless of a scheduling command received from its
scheduling node-B. Alternatively, upon receiving a None
command from the non-scheduling node-B, the UE increases or
decreases its transmission power level and/or transmission
data rate depending on a scheduling command received from the
scheduling node-B. Again, in the alternative, upon receiving
a Keep command from the non-scheduling node-B, the UE keeps the current transmission power level and/or
transmission data rate, regardless of a scheduling command
received from the scheduling node-B.
[0040] In an event that there are a plurality of non-
scheduling node-Bs for a UE, the UE reduces its transmission
power level and/or transmission data rate if it receives a
Down command from any one of the plurality of non-scheduling
node-Bs, regardless of commands received from other non-
scheduling node-Bs. If the UE receives a Keep command from
one of the plurality non-scheduling node-Bs without receiving
a Down command from any non-scheduling node-B, the UE keeps
the current transmission power level and/or transmission data
rate.
[0041] FIG. 4 is a diagram illustrating a method for
modulating node-B scheduling control commands, according to
an embodiment of the present invention.
[0042] Referring to FIG. 4, Down and Keep commands are
transmitted from the non-scheduling node-B when the
interference in the cell is too high. Furthermore, None
commands may be transmitted from the non-scheduling node-B.
Accordingly, a modulation method for transmission of
Down/Keep/None commands may be employed in which there is no None command transmitted. This exemplary modulation
method corresponds to discontinuous transmission (DTX) , as
shown in FIG. 4. As such, Down and Keep commands are
transmitted after being modulated into signals having
opposite voltages, thereby achieving efficient transmission
of Down/Keep/None commands.
[0043] In another embodiment, a node-B scheduling method
may include a node-B passing a command received from its non-
scheduling node-B to its scheduling node-B in the uplink
instead of directly implementing the received command.
[0044] For example, the non-scheduling node-B transmits
or broadcasts Down/None commands or Down/Keep/None commands
to the UE. However, the node-B does not directly implement a
command received from the non-scheduling node-B. Instead, the
node-B passes the received command to the scheduling node-B.
The scheduling node-B determines whether to keep or decrease
the uplink transmission power level and/or transmission data
rate of the UE, taking account of the command received from
the UE, and transmits the result of the determination to the
UE.
[0045] Accordingly, the non-scheduling node-B, which does
not know the buffer state or priority of the UE or the uplink state of the scheduling node- B of the UE, is prevented
from imposing unilateral restrictions on the UE, thereby
achieving appropriate scheduling control.
[0046] In an event that there are a plurality of non-
scheduling node-Bs for a UE, the UE may pass a Down command
received from one of the plurality of non-scheduling node-Bs
to its scheduling node-B. Alternatively, the UE may pass a
Keep command received from one of the plurality of non-
scheduling node-Bs to its scheduling node-B if the UE
receives the Keep command without receiving a Down command
from any non-scheduling node-B.
[0047] In one embodiment, a method of controlling uplink
transmission of a user equipment in a soft handover mode in a
wireless communication system comprises communicating with a
first network and a second network, at a first transmission
mode comprising a first transmission power level and a first
data rate. The method also comprises receiving a first change
command from the second network to change the first
transmission mode to a second transmission mode, wherein the
second transmission mode comprises a second transmission
power level and a second data rate. The method also comprises
entering the second transmission mode. The method also comprises maintaining the second transmission mode for
a predetermined time period regardless of a second change
command from the first network to increase at least one of
transmission power level and data rate of the user equipment.
[0048] The first network may comprise a serving network
and the second network comprises a non-serving network. The
second transmission power level may be lower than the first
transmission power level. The second data rate may be lower
than the first data rate. The first change command may be
associated with decreasing at least one of transmission power
level and data rate of the user equipment. The first change
command may be included in a scheduling command from the
second network.
[0049] In the step of maintaining the second transmission
mode, the user equipment may decrease at least one of
transmission power level and data rate if another change
command is received from one of the first and second networks
to decrease at least one of transmission power level and data
rate. The predetermined time may be received from the first
network.
[0050] In another embodiment, a method of controlling
uplink transmission of a user equipment in a soft handover mode in a wireless communication system
comprises communicating with a first network and a second
network, at a first transmission mode comprising a first
transmission power level and a first data rate. The method
also comprises receiving a first change command from the
second network to change the first transmission mode to a
second transmission mode, wherein the second transmission
mode comprises a second transmission power level and a second
data rate. The method also comprises entering the second
transmission mode. The method also comprises maintaining the
second transmission mode while a maintain command is received
■from the second network regardless of a second change command
from the first network to increase at least one of
transmission power level and data rate of the user equipment.
[0051] The first change command and the maintain command
may be represented by a scheduling command from the second
network. The maintain command and the first change command
may be modulated to have opposite polarities. In the step of
maintaining the second transmission mode, the user equipment
may decrease at least one of transmission power level and
data rate if another change command is received from the
first network to decrease at least one of transmission power level and data rate.
[0052] In yet another embodiment, a method of controlling
uplink transmission of a user equipment in a soft handover
mode in a wireless communication system comprises
communicating with a first network and a second network, at a
first transmission mode comprising a first transmission power
level and a first data rate. The method also comprises
transmitting a first change command to cause the user
equipment from the second network to change the first
transmission mode to a second transmission mode, wherein the
second transmission mode comprises a second transmission
power level and a second data rate. The method also comprises
transmitting a maintain command to the user equipment to
cause the user equipment to maintain the second transmission
mode for a predetermined time period regardless of a second
change command from the first network to increase at least
one of transmission power level and data rate of the user
equipment.
[0053] In still another embodiment, a method of
controlling uplink transmission of a user equipment in a soft
handover mode in a wireless communication system comprises
communicating with a first network and a second network, at a first transmission mode comprising a first
transmission power level and a first data rate. The method
also comprises transmitting a first change command to cause
the user equipment from the second network to change the
first transmission mode to a second transmission mode,
wherein the second transmission mode comprises a second
transmission power level and a second data rate. The method
also comprises transmitting a maintain command to the user
equipment to cause the user equipment to maintain the second
transmission mode regardless of a second change command from
the first network to increase at least one of transmission
power level and data rate of the user equipment.
[0054] Although the above embodiments have been described
with reference to node-B scheduling applied to control of
transmission power level and/or transmission data rate of UEs,
the node-B scheduling method may be applied to control
maximum allowable transmission power level, transmission data
rate, or transmission power of UEs.
[0055] The present invention may provide control of
uplink transmission to enable more efficient control of the
interference to a node-B caused by a UE which is not subject
to scheduling of the node-B and which is in communication with the node-B during handover.
[0056] It will be apparent to those skilled in the art
that various modifications and variations may be made in the
present invention without departing from the spirit or scope
of the inventions. Thus, it is intended that the present
invention covers the modifications and variations of this
invention provided they come within the scope of the appended
claims and their equivalents.
INDERSTRIAL APPLICABILITY
[0057] The present invention can be applied to a
broadband wireless access system.

Claims

[CLAIMS]
1. A method of controlling uplink transmission of a
user equipment in a soft handover mode in a wireless
communication system, the method comprising:
communicating with a first network and a second network,
at a first transmission mode comprising a first transmission
power level and a first data rate;
receiving a first change command from the second network
to change the first transmission mode to a second
transmission mode, wherein the second transmission mode
comprises a second transmission power 'level and a second data
rate;
entering the second transmission mode; and
maintaining the second transmission mode for a
predetermined time period regardless of a second change
command from the first 'network to increase at least one of
transmission power level and data rate of the user equipment.
2. The method of claim 1, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
3. The method of claim 1, wherein the second
transmission power level is lower than the first transmission
power level.
4. The method of claim 1, wherein the second data rate
is lower than the first data rate.
5. The method of claim 1, the first change command is
associated with decreasing at least one of transmission power
level and data rate of the user equipment.
6. The method of claim 1, wherein the first change
command is included in a scheduling command from the second
network.
7. The method of claim 1, wherein in the step of
maintaining the second transmission mode, the user equipment
decreases at least one of transmission power level and data
rate if another change command is received from one of the
first and second networks to decrease at least one of
transmission power level and data rate.
8. The method of claim 1, wherein the predetermined
time is received from the first network.
9. A method of controlling uplink transmission of a
user equipment in a soft handover mode in a wireless
communication system, the method comprising:
communicating with a first network and a second network,
at a first transmission mode comprising a first transmission
power level and a first data rate;
receiving a first change command from the second network
to change the first transmission mode to a second
transmission mode, wherein the second transmission mode
comprises a second transmission power level and a second data
rate;
entering the second transmission mode; and
maintaining the second transmission mode while a
maintain command is received from the second network
regardless of a second change command from the first network
to increase at least one of transmission power level and data
rate of the user equipment.
10. The method of claim 9, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
11. The method of claim 9, wherein the second
transmission power level is lower than the first transmission
power level.
12. The method of claim 9, wherein the second data rate
is lower than the first data rate.
13. The method of claim 9, the first change command is
associated with decreasing at least one of transmission power
level and data rate of the user equipment.
14. The method of claim 9, wherein the first change
command and the maintain command are represented by a
scheduling command from the second network.
15. The method of claim 14, wherein the maintain
command and the first change command are modulated to have
opposite polarities.
16. .The method of claim 9, wherein in the step of
maintaining the second transmission mode, the user equipment
decreases at least one of transmission power level and data
rate if another change command is received from the first
network to decrease at least one of transmission power level
and data rate.
17. A method of controlling uplink transmission of a
user equipment in a soft handover mode in a wireless
communication system, the method comprising:
communicating with a first network and a second network,
at a first transmission mode comprising a first transmission
power level and a first data rater-
transmitting a first change command to cause the user
equipment from the second network to change the first
transmission mode to a second transmission mode, wherein the
second transmission mode comprises a second transmission
power level and a second data rate; and
transmitting a maintain command to the user equipment to
cause the user equipment to maintain the second transmission
mode for a predetermined time period regardless of a second
change command from the first network to increase at least one of transmission power level and data rate of the
user equipment.
18. The method of claim 17, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
19. The method of claim 17, wherein the second
transmission power level is lower than the first transmission
power level.
20. A method of controlling uplink transmission of a
user equipment in a soft handover mode in a wireless
communication system, the method comprising:
communicating with a first network and a second network,
at a first transmission mode comprising a first transmission
power level and a first data rate;
transmitting a first change command to cause the user
equipment from the second network to change the first
transmission mode to a second transmission mode, wherein the
second transmission mode comprises a second transmission
power level and a second data rate; and transmitting a maintain command to the user equipment
to cause the user equipment to maintain the second
transmission mode regardless of a second change command from
the first network to increase at least one of transmission
power level and data rate of the user equipment.
21. The method of claim 20, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
22. The method of claim 20, wherein the second
transmission power level is lower than the first transmission
power level.
23. The method of claim 20, wherein the second data
rate is lower than the first data rate.
24. The method of claim 20, the first change command is
associated with decreasing at least one of transmission power
level and data rate of the user equipment.
25. The method of claim 20, wherein the first change command and the maintain command are represented by a
scheduling command from the second network.
26. The method of claim 25, wherein the maintain
command and the first change command are modulated to have
opposite polarities.
27. The method of claim 20, wherein in the step of
maintaining the second transmission mode, the user equipment
decreases at least one of transmission power level and data
rate if another change command is received from the first
network to decrease at least one of transmission power level
and data rate.
28. A user equipment adapted to control uplink
transmission in a soft handover mode in a wireless
communication system, the user equipment comprising:
means for communicating with a first network and a
second network, at a first transmission mode comprising a
first transmission power level and a first data rate;
means for receiving a first change command from the
second network to change the first transmission mode to a
second transmission mode, wherein the second transmission mode comprises a second transmission power level and
a second data rate;
means for entering the second transmission mode; and
means for maintaining the second transmission mode for a
predetermined time period regardless of a second change
command from the first network to increase at least one of
transmission power level and data rate of the user equipment.
29. The user equipment of claim 28, wherein the first
network comprises a serving network and the second network
comprises a non-serving network.
30. The user equipment of claim 28, wherein the second
transmission power level is lower than the first transmission
power level.
31. A user equipment adapted to control uplink
transmission in a soft handover mode in a wireless
communication system, the user equipment comprising:
means for communicating with a first network and a
second network, at a first transmission mode comprising a
first transmission power level and a first data rate; means for receiving a first change command from the
second network to change the first transmission mode to a
second transmission mode, wherein the second transmission
mode comprises a second transmission power level and a second
data rate means for entering the second transmission mode;
and
means for maintaining the second transmission mode while
a maintain command is received from the second network
regardless of a second change command from the first network
to increase at least one of transmission power level and data
rate of the user equipment.
32. The user equipment of claim 31, wherein the first
network comprises a serving network and the second network
comprises a non-serving network.
33. The user equipment of claim 31, wherein the second
transmission power level is lower than the first transmission
power level.
34. A network adapted to controlling uplink
transmission of a user equipment in a soft handover mode in a wireless communication system, the network comprising:
means for communicating with a first network and a
second network, at a first transmission mode comprising a
first transmission power level and a first data rate;
means for transmitting a first change command to cause
the user equipment from the second network to change the
first transmission mode to a second transmission mode,
wherein the second transmission mode comprises a second
transmission power level and a second data rate; and
means for transmitting a maintain command to the user
equipment to cause the user equipment to maintain the second
transmission mode for a predetermined time period regardless
of a second change command from the first network to increase
at least one of transmission power level and data rate of the
user equipment.
35. The network of claim 34, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
36. The network of claim 34, wherein the second
transmission power level is lower than the first transmission power level.
37. A network adapted to controlling uplink
transmission of a user equipment in a soft handover mode in a
wireless communication system, the network comprising:
means for communicating with a first network and a
second network, at a first transmission mode comprising a
first transmission power level and a first data rate;
means for transmitting a first change command to cause
the user equipment from the second network to change the
first transmission mode to a second transmission mode,
wherein the second transmission mode comprises a second
transmission power level and a second data rate; and
means for transmitting a maintain command to the user
equipment to cause the user equipment to maintain the second
transmission mode. regardless of a second change command from
the first network to increase at least one of transmission
power level and data rate of the user equipment.
38. The network of claim 37, wherein the first network
comprises a serving network and the second network comprises
a non-serving network.
39. The network of claim 37, wherein the second
transmission power level is lower than the first transmission
power level.
PCT/KR2005/002608 2004-08-11 2005-08-11 Uplink transmission power control in wireless communication system Ceased WO2006016776A2 (en)

Priority Applications (3)

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JP2007525542A JP4745339B2 (en) 2004-08-11 2005-08-11 Uplink transmission power control in wireless communication systems

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KR1020040063124A KR101055731B1 (en) 2004-08-11 2004-08-11 Uplink transmission control method

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CN101002403A (en) 2007-07-18
EP1776776A4 (en) 2012-03-21
EP1776776B1 (en) 2016-10-05
EP1776776A2 (en) 2007-04-25
KR20060014545A (en) 2006-02-16
WO2006016776A3 (en) 2006-12-07
KR101055731B1 (en) 2011-08-11
US20060034223A1 (en) 2006-02-16
US7349374B2 (en) 2008-03-25
CN101002403B (en) 2011-07-20
JP2008510354A (en) 2008-04-03

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