(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
`(19) World Intellectual Property Organization _
`International Bureau
`
`A
`
`' |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
`
`(43) International Publication Date
`5 October 2006 (05.10.2006)
`
`(51) International Patent Classification:
`H04B 7/26 (2006.01)
`
`(21) International Application Number:
`PCT/KR2006/001149
`
`(22) International Filing Date:
`
`29 March 2006 (29.03.2006)
`
`(25) Filing Language:
`
`(26) Publication Language:
`
`English
`
`English
`
`(30) Priority Data:
`10-2005-0025893
`
`29 March 2005 (29.03.2005)
`
`KR
`
`(71) Applicant: SAMSUNG ELECTRONICS CO., LTD.
`[KR/KR]; 416, Maetan-dong, Yeongtong-gu, Suwon-si,
`Gyeonggi-do 442-742 (KR).
`
`(72) Inventors: KWAK, Young-Jun; #206-901, Sujinmaeul
`2—danji Hyosung Apt., Dongcheon-dong, Yongin-si,
`Gyeonggi-do 449-514 (KR). CHOI, Sung-Ho; #232-503,
`Hwanggolmaeul 2—danji Apt., Yeongtong-dong, Yeong-
`tong-gu, Suwon-si, Gyeonggi-do 443-740 (KR). LEE,
`
`(10) International Publication Number
`
`WO 2006/104348 A1
`
`(74)
`
`(81)
`
`#730-304, Salgugol Hyundai Apt., Yeong-
`Ju-Ho;
`tong-dong, Yeongtong-gu,
`Suwon-si, Gyeonggi-do
`443-736 (KR). HEO, Youn-Hyoung; #202,
`1035-2,
`Yeongtong-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do
`443-813 (KR).
`
`110-2, Myon-
`Agent: LEE, Keon-Joo; Mihwa Bldg.
`gryun-dong 4-ga,, Chongro-gu, Seoul 110-524 (KR).
`
`Designated States (unless otherwise indicated, for every
`kind of national protection available): AE, AG, AL, AM,
`AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN,
`CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI,
`GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE,
`KG, KM, KN, KP, KZ, LC, LK, LR, LS, LT, LU, LV, LY,
`MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO,
`NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK,
`SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC,
`VN, YU, ZA, ZM, ZW.
`
`(84)
`
`Designated States (unless otherwise indicated, for every
`kind of regional protection available): ARIPO (BW, GH,
`GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM,
`ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM),
`
`[Continued on next page]
`
`(54) Title: METHOD AND APPARATUS FOR SIGNALING MAXIMUM UE TRANSMITTER POWER INFORMATION TO
`BASE STATION FOR SCHEDULING OF UPLINK PACKET TRANSMISSION IN A MOBILE COMMUNICATION SYSTEM
`
`and
`A method
`(57) Abstract:
`apparatus are provided for signaling
`a maximum UE transmitter power
`to a Node B for use in scheduling
`of uplink packet
`transmission in
`a mobile
`communication
`system.
`The Node B receives uplink channel
`status information from a UE and
`
`a maximum UE transmitter power
`from an RNC. The maximum UE
`
`transmitter power is the lower of the
`maximum allowed UL Tx power and
`the maximum Tx power of the UE.
`The Node B then schedules uplink
`packet
`transmission from the UE
`based on the uplink channel status
`information and the maximum UE
`
`transmitter power.
`
`Petitioner's Exhibit 1005
`
`501
`
`HNC
`
`506
`
`UE capability
`into
`
`507
`
`Maximum UE
`transmitter power
`
`
`
`Node B Power
`
`
`margin
`
`504
`
`
`
`
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`Petitioner's Exhibit 1005
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`WO 2006/104348 A1
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`||||||||||||||ll|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
`
`European (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FT,
`FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT,
`RO, SE, SI, SK, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA,
`GN, GQ, GW, ML, MR, NE, SN, TD, TG).
`Published:
`
`— with international search report
`
`For two—letter codes and other abbreviations, refer to the ”Guid—
`ance Notes on Codes and Abbreviations " appearing at the begin-
`ning of each regular issue of the PCT Gazette.
`
`Petitioner's Exhibit 1005
`
`Petitioner's Exhibit 1005
`
`

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`W0 2006/104348
`
`PCT/KR2006/001149
`
`_1_
`
`METHOD AND APPARATUS FOR SIGNALING MAXIMUM UE
`
`TRANSMITTER POWER INFORMATION TO BASE STATION FOR
`
`SCHEDULING OF UPLINK PACKET TRANSMISSION IN A MOBILE
`
`COMMUNICATION SYSTEM
`
`BACKGROUND OF THE INVENTION
`
`Field of the Invention:
`
`The present
`invention relates generally to a mobile communication
`system for supporting an enhanced uplink dedicated transport channel service. In
`particular, the present invention relates to a method and apparatus for scheduling
`uplink packet transmissions from User Equipments (UEs) based on information
`received from a Serving Radio Network Controller (SRNC) in a Node B.
`
`Description of the Related Art:
`An asynchronous Wideband Code Division Multiple Access (WCDMA)
`communication system uses an Enhanced Uplink Dedicated CHannel (E~DCH).
`The E-DCH was designed to improve the perfonnance of uplink packet
`transmission in the WCDMA communication system. New techniques have been
`
`introduced to the E-DCH transmission,
`
`including Adaptive Modulation and
`
`(HARQ), and shorter
`reQuest
`Coding (AMC), Hybrid Automatic Repeat
`Transmission Time Interval
`(TTI). AMC and HARQ are existing schemes
`adopted for High Speed Downlink Packet Access (HSDPA). A TTI is a time unit
`in which one data block is carried on a physical channel. In HSDPA, a Node B
`(instead of a Radio Network Controller (RNC)),
`is responsible for uplink
`scheduling as Well as downlink scheduling. Accordingly, the uplink Node B-
`controlled scheduling differs from the downlink Node B-controlled scheduling.
`FIG.
`1 illustrates uplink packet transmission on the E-DCH in a typical
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`mobile communication system.
`Referring to FIG. 1, reference numeral 100 denotes a Node B supporting
`the E-DCH service and reference numerals 101 to 104 denote UEs using the E-
`
`30
`
`DCH. The Node B 100 schedules E-DCHs for the UEs 101 to 104 based on their
`channel conditions. The scheduling is carried out such that a lower rate is
`allocated to a UE that is remote from the Node B 100, and a higher rate is
`
`allocated to a nearby UE to avoid a noise rise measurement at the Node B 100
`
`35
`
`exceeding a target noise rise.
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`-2-
`
`FIG. 2 is a diagram illustrating a signal flow for a typical E~DCH
`transmission and reception procedure between a UE 202 and a serving Node B
`201.
`
`Referring to FIG. 2, the Node B 201 and the UE 202 set up an E—DCH
`between them in step 203. Step 203 involves message transmissions on dedicated
`
`transport channels. The UE 202 transmits scheduling information to the Node B
`201 in step 204. The scheduling information may contain the transmit (TX) power,
`the TX power margin, or the amount of buffered transmission data of the UE 202.
`
`The uplink channel status of the UE 202 can be estimated from the Tx power and
`the TX power margin.
`
`In step 211, the Node B 201 monitors scheduling information from a
`plurality of UEs to schedule uplink data transmissions fi‘om the individual UEs.
`
`How the scheduling is performed may vary with the Node B 201, which will be
`described in greater detail below. If the Node B 201 decides to approve an uplink
`packet
`transmission from the UE 202,
`it
`transmits scheduling assignment
`information, i.e. a scheduling grant to the UE 202 in step 205.
`
`In step 212, the UE 202 determines the Transport Format (TF) of the E-
`
`DCH based on the scheduling assignment information. The UE 202 then transmits
`
`control information about the E-DCH and E-DCH data to the Node B 201 at a
`
`data rate and a transmission timing determined according to the scheduling
`assignment information in steps 206 and 207.
`
`The Node B 200 checks for errors in the E-DCH control information and
`
`the E-DCH data in step 213. In the presence of errors in either of the E-DCH
`
`control information and the E-DCH data, the Node B 201 transmits a Negative
`ACKnowledgement (NACK) signal to the UE 202 on an ACK/NACK channel,
`whereas in the absence of errors in both, the Node B 201 transmits an ACK signal
`to the UE 202 on the ACK/NACK channel in step 208.
`
`The Node B 201 determines a data rate for the UE 202 by scheduling
`based on the scheduling information received in step 204. The Node B 201 must
`
`allocate appropriate data rates and transmission timings to the plurality of UEs.
`For this purpose, the Node B 201 allocates resources to the UEs by performing
`
`scheduling such that uplink Rise over Thermal (RoT) at the Node B 201 does not
`
`exceed a target RoT. Accordingly, more resources are allocated to a UE in a good
`channel condition in order to improve overall system performance.
`
`Now a description will be made of a procedure for scheduling E-DCH
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`-3-
`
`transmissions from UEs in the Node B. As stated above, the Node B 201 performs
`scheduling such that the RoT of the Node B 201 does not exceed the target RoT
`and such that capacity is maximized as well. The scheduling is based on the
`
`scheduling information received from the UEs in step 204 of FIG. 2. The
`
`scheduling information is signaled to the Node B 201 as follows.
`
`One method of signaling the scheduling information comprises steps such
`that each UE signals its Tx power to the Node B 201. The UE may additionally
`signal a queue size indicating the amount of data buffered in its buffer. The Node
`
`B 201 estimates the uplink channel status of the UE from the Tx power,
`thereby allocate appropriate resources to the UE.
`
`to
`
`This signaling method will now be described in greater detail with
`
`reference to FIG. 1. The UEs 101 to 104 are separated from the Node B 100 by
`different distances. The UE 101 is nearest and the UE 104 is farthest. Thus, the
`
`UE 101 transmits an uplink channel at the weakest power level, whereas the UE
`
`104 transmits an uplinlc channel at the strongest power level. Accordingly,
`
`to
`
`achieve the highest performance under the same RoT measurement, scheduling is
`
`done so that power is inversely proportional to data rate. That is, the Node B 100
`
`schedules uplink data transmission in the manner that allocates a higher data rate
`
`to the nearest UE 101 with the lowest transmit power, and a lower data rate to the
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`
`farthest UE 104 with the highest transmit power.
`
`The
`
`above-described scheduling is
`
`called maximum Channel-to-
`
`Interference (C/I) scheduling. However, if each UE signals channel information
`
`only,
`
`the Node B may lose flexibility in scheduling due to the absence of
`
`information about the Tx power margin of the UE.
`
`Even though many resources are allocated to a UE in a good uplink
`
`channel status, if the UE does not have a sufficient power margin, it cannot utilize
`
`the allocated resources fully. For example, since the UE 101 is near to the Node B
`
`100 and thus can transmit data at a low transmit power level, the Node B 100 can
`
`allocate a relatively high data rate to the UE 101. Yet, if the UE 101 does not have
`
`a sufficient transmit power margin, full utilization of the allocated resources is
`
`impossible. That is, because the Node B 100 has no knowledge of the available
`
`Tx power margin of the UE 101, it cannot make an effective decision as to how
`
`many resources are to be allocated to the UE 101.
`
`Another method of signaling the scheduling information comprises steps
`
`to signal the Tx power margin of the UE as the scheduling information. After
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`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`_ 4 _
`
`receiving TX power margins from a plurality of UEs,
`
`the Node B allocates
`
`resources to the UEs by scheduling based on the TX power margins in the manner
`
`that increases cell performance.
`
`This signaling method also has a distinctive drawback in that the Node B
`
`cannot accurately estimate the channel condition of each UE. The uplink channel
`
`status of the UE cannot be derived accurately from the TX power margin
`information only. As a consequence, the C/I scheduling scheme based on channel
`
`condition is not viable.
`
`For instance, when the UEs 101 to 104 signal their TX power margins to
`
`the Node B 100, the Node B 100 allocates more resources to a UE having a
`
`greater TX power margin, and less resources to a UE having a smaller TX power
`
`margin. However, when a UE has a sufficient transmit power margin but is placed
`
`in a bad channel condition,
`
`the Node B does not actually allocate as many
`
`resources as corresponding to the TX power margin. Even if the Node B does
`
`allocate such resources,
`
`the bad channel condition leads
`
`to failed data
`
`transmission and reception, thereby decreasing channel capacity.
`
`Accordingly, a need eXists for a system and method for effectively and
`
`efficiently signaling UE information for use in uplink packet transmission in a
`
`mobile communication system.
`
`SUMMARY OF THE INVENTION
`
`An object of embodiments of the present invention is to substantially
`
`solve at least the above problems and/or disadvantages and to provide at least the
`
`advantages described below. Accordingly, embodiments of the present invention
`
`provide a method and apparatus for signaling the total available TX power of its
`
`E—DCH by each E-DCH-supporting UE.
`
`According to one aspect of embodiments of the present invention, a
`
`method is provided for
`
`scheduling an uplink data service in a mobile
`
`communication system supporting the uplink data service. The method comprises
`
`a step in which a Node B receives one of a TX power and a TX power margin from
`
`a UE. The TX power and the TX power margin comprise uplink channel status
`
`information of the UE. The method further comprises a step in which the Node B
`
`receives a maXimum UE transmitter power from an RNC. The maximum UE
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`transmitter power comprises the lower of a maximum allowed UL TX power
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`35
`
`determined for the UE by the RNC and a maximum TX power corresponding to a
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`_ 5 _
`
`power class of the UE. The method further comprises a step in which the Node B
`schedules uplink packet transmission from the UE based on the uplink channel
`
`status information and the maximum UE transmitter power.
`
`According to another aspect of embodiments of the present invention, a
`method is provided for scheduling an uplink data service in an RNC in a mobile
`communication system supporting the uplink data service. The method comprises
`a step in which UE capability information including a maximum Tx power of a
`UE is received from the UE. The method further comprises steps in which it is
`
`determined whether a maximum allowed UL Tx power exists for the UE, and in
`
`the presence of the maximum allowed UL Tx power, the lower of the maximum
`allowed UL Tx power and the maximum Tx power is selected as a maximum UE
`transmitter power for the UE, and the maximum UE transmitter power is signaled
`
`to a Node B communicating with the UE.
`
`According to another aspect of embodiments of the present invention, a
`method is provided for
`scheduling an uplink data service in a mobile
`communication system supporting the uplink data service. The method comprises
`a step in which a UE signals one of its Tx power and its Tx power margin, and the
`amount of buffered data to be transmitted, to a Node B. The Tx power and the Tx
`power margin comprise uplink channel status information of the UE. The method
`further comprises steps in which the UE receives a scheduling grant from the
`Node B, wherein the scheduling grant is determined by the Node B based on a
`maximum UE transmitter power, and the Tx power or the Tx power margin, and
`the maximum UE transmitter power is selected to be the lower of a maximum
`allowed UL Tx power and a maximum Tx power corresponding to a power class
`of the UE by the RNC. The method still further comprises a step in which the UE
`transmits uplink data to the Node B according to the scheduling grant.
`According to still another aspect of embodiments of the present invention,
`an apparatus is provided for scheduling an uplink high—speed packet data service
`in a mobile communication system supporting uplink data service. The apparatus
`comprises an RNC
`for
`receiving UE capability information including a
`maximum Tx power of a UE from the UE, determining whether a maximum
`allowed UL Tx power exists for the UE, and selecting the lower of the maximum
`allowed UL Tx power and the maximum Tx power as a maximum UE transmitter
`power for the UE, in the presence of the maximum allowed UL Tx power. The
`apparatus further comprises a Node B for receiving one of a Tx power and a Tx
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`Petitioner's Exhibit 1005
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`- 6 -
`
`power margin from the UE. The TX power and the TX power margin comprise
`uplink channel status information of the UE. The Node B receives the maximum
`
`UE transmitter power from the RNC, and schedules uplink packet transmission
`from the UE based on the uplink channel status information and the maximum
`
`UE transmitter power.
`
`According to yet another aspect of embodiments of the present invention,
`an apparatus is provided for scheduling an uplink data service in a UE in a mobile
`
`The apparatus
`communication system supporting the uplink data service.
`comprises a scheduling information transmitter for signaling one of a TX power
`and a TX power margin, and the amount of buffered data to be transmitted to a
`
`Node B. The TX power and the TX power margin comprise uplink channel status
`information of the UE. The apparatus further comprises a scheduling assignment
`information receiver for receiving a scheduling grant from the Node B. The
`scheduling grant
`is determined by the Node B based on a maximum UE
`
`transmitter power, and the TX power or the TX power margin, and the maximum
`UE transmitter power is selected to be the lower of a maximum allowed UL TX
`
`power and a maximum TX power corresponding to a power class of the UE by the
`RNC. The apparatus
`still
`further comprises
`a controller
`for controlling
`transmission of uplink data to the Node B according to the scheduling grant.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The above and other objects, features and advantages of embodiments of
`the present invention will become more apparent from the following detailed
`description when taken in conjunction with the accompanying drawings,
`in
`which:
`
`1 illustrates uplink packet transmission on the E—DCH in a typical
`FIG.
`mobile communication system;
`
`FIG. 2 is a diagram illustrating a signal flow for a typical E—DCH
`
`transmission and reception procedure;
`
`FIG. 3 is a diagram illustrating exemplary signaling of maximum TX
`
`power information according to an embodiment of the present invention;
`
`FIG. 4 is a diagram illustrating exemplary signaling of maximum allowed
`uplink (UL) TX power information according to an embodiment of the present
`invention;
`
`FIG 5 illustrates an exemplary system configuration according to an
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`Petitioner's Exhibit 1005
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`PCT/KR2006/001149
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`embodiment of the present invention;
`
`FIG. 6 is a flowchart illustrating an exemplary operation of a Serving
`Radio Network Controller (SRNC) according to an embodiment of the present
`invention;
`
`FIG. 7 illustrates an exemplary system configuration according to another
`embodiment of the present invention;
`
`FIG. 8 is a block diagram of an exemplary UE according to embodiments
`of the present invention; and
`
`FIG. 9 is a flowchart illustrating an exemplary operation of the UE
`according to embodiments of the present invention.
`
`Throughout the drawings, like reference numerals will be understood to
`
`refer to like parts, components and structures.
`
`DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
`
`Exemplary embodiments of the present invention will be described herein
`
`below with reference to the accompanying drawings. In the following description,
`well-known functions or constructions are not described in detail since they
`would obscure the invention in unnecessary detail.
`
`Embodiments of the present invention provide a system and method for
`
`optimal scheduling of UEs supporting the E-DCH. To do so, a Node B takes into
`
`account the Tx power margins and Tx powers of the UEs. In addition to the
`
`method for direct transmission of the scheduling information from the UEs to the
`
`Node B on physical channels, the following exemplary methods can be used for
`
`efficiently signaling the scheduling information according to embodiments of the
`present invention.
`
`Tx power (Tx(power)) and Tx power margin (Tx(margin)) representing
`uplink channel status information are typically in the relationship represented by
`the following Equation (1).
`
`Tx(power) + Tx(margz'n) = Maximum UE trcmsmitter power
`
`.....(1)
`
`According to Equation (1), a maximum UE transmitter power is the sum
`
`of a Tx power and a Tx power margin.
`
`Hence if the Node B has knowledge of the maximum UE transmitter
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`_ 8 _
`
`power of a UE, even though it receives only one of the Tx power and the Tx
`
`power margin from the UE,
`
`it can estimate the other information by using
`
`Equation (1), thereby enabling efficient scheduling.
`
`As described above, the Node B allocates resources to UEs using the E-
`
`DCH through scheduling based on scheduling information received from the UEs.
`
`In this context, an exemplary method and apparatus can be provided for
`
`informing the Node B of the maximum UE transmitter power of a UE in
`
`accordance with embodiments of the present invention.
`
`Two factors associated with the maximum UE transmitter power,
`
`i.e.
`
`10
`
`maximum Tx power and maximum allowed UL Tx power, will be described in
`
`greater detail below.
`Four Tx power classes are defined for the E—DCH depending on UE
`
`capability, as illustrated by way of example in Table 1 below.
`Table 1
`
`Operating B and
`
`
`
`
`
`(dBm)
`
`(dB)
`
`(dBm)
`
`(dB)
`
`(dBm)
`
`(dB)
`
`(dBm)
`
`(dB)
`
`——
`
`
`
`-- T
`
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`25
`
`able 1 specifies maximum Tx powers and power error limits with which
`
`UEs can physically transmit data according to the power classes of the UEs. For a
`UE with Power Class 3, the maximum Tx power is +24 dB1n, and the power error
`limit ranges from +1dB to -3dB. Operating Bands represent three WCDMA bands.
`The UE can report the maximum Tx power corresponding to its power class to an
`
`SRNC by Radio Resource Control (RRC) signaling.
`FIG. 3 is a diagram illustrating exemplary signaling of maximum Tx
`power information from the UE to the SRNC according to embodiments of the
`
`present invention.
`Referring to FIG. 3, a UE 301 signals UE capability information 303 set
`as a physical value to an SRNC 302 by an RC message. The UE capability
`information 303 comprises maximum Tx power information corresponding to the
`
`power class of the UE 301, but is not limited thereto.
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`_9_
`
`The SRNC 302 restricts a maximum UL Tx power for every UE within
`
`the cell coverage of the Node B in order to efficiently manage the resources of the
`
`cell. This maximum UL Tx power is called maximum allowed UL Tx power and
`
`its range is given by way of example in Table 2 below.
`
`
`
`Element
`
`Table 2
`
`description
`
`UL Tx power—
`
`
`
`
`
`FIG. 4 is a diagram illustrating exemplary signaling of maximum allowed
`
`UL Tx power information from the SRNC to the UE according to an embodiment
`
`of the present invention.
`
`10
`
`Referring to FIG. 4, an SRNC 402 signals a maximum allowed UL Tx
`
`power 403 to a UE 401 by an RRC message. The RRC message comprises a
`
`System Infonnation Block (SIB) or a dedicated message, but is not limited thereto.
`
`In relation to the maximum UE transmitter power, the UE has knowledge
`
`of both the maximum Tx power corresponding to its power class and the
`
`15
`
`maximum allowed UL Tx power signaled by the SRNC.
`
`The maximum UE transmitter power available to the UE at a given time
`
`instant is the lower of the maximum Tx power and the maximum allowed UL Tx
`
`power as illustrated by Equation (2) below.
`
`20
`
`Maximum UE z.‘ransmz'tz.‘er power = mirL(Maxz'mum allowed UL Tx power, Maximum Tx power)
`
`.....(2)
`
`Accordingly, an embodiment of the present invention provides a method
`
`of enabling the Node B to determine the maximum Tx power available to the UE
`
`25
`
`at a given time instant, i.e. the maximum UE transmitter power. The UE directly
`
`signals either its Tx power or Tx power margin to the Node B.
`
`The SRNC infonns the Node B of the maximum UE transmitter power of
`
`the UE by Node B Application Protocol (NBAP) signaling or in data payload on a
`
`user plane. Because the UE operates by selecting the lower of the maximum Tx
`
`30
`
`power and the maximum allowed UL Tx power as the maximum UE transmitter
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`

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`WO 2006/104348
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`PCT/KR2006/001149
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`_ 10 _
`
`power, the Node B does not need to receive information indicating the UE’s
`
`selection from the SRNC, which might otherwise incur unnecessary overhead.
`
`Therefore, the SRNC signals the maximum UE transmitter power being
`
`the lower of the maximum Tx power and the maximum allowed UL Tx power to
`
`the Node B in an embodiment of the present invention. Exemplary operation and
`
`signaling of the SRNC will be described in greater detail below with reference to
`
`first and second exemplary embodiments of the present invention.
`
`First Exemplary Embodiment
`
`10
`
`In a first exemplary embodiment of the present invention,
`
`the RNC
`
`selects information required for the Node B between the maximum allowed UL
`
`Tx power and the maximum Tx power and signals the selected information to the
`
`Node B, and the UE transmits its Tx power margin to the Node B.
`
`More specifically, the UE signals its Tx power margin to the Node B on a
`
`15
`
`physical channel, and the RNC signals the maximum UE transmitter power to the
`
`Node B by NBAP signaling or in data payload on a user plane via an Iub
`
`connection. The maximum UE transmitter power is delivered by defining a new
`
`NBAP message for the E-DCH, or modifying an existing NBAP message. If a
`
`user—plane message is used, a change is incurred to the user plane correspondingly.
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`20
`
`The RNC selects one of the maximum allowed UL Tx power and the
`
`maximum Tx power as the maximum UE transmitter power according to a
`
`predetermined criterion and signals the maximum UE transmitter power to the
`
`Node B by an NBAP message for the E-DCH or a user—plane message.
`
`FIG. 5 illustrates signaling among the RNC, the Node B and the UE
`
`25
`
`according to the first exemplary embodiment of the present invention.
`
`Referring to FIG. 5, a UE 503 receives the E-DCH service and a RNC
`
`501 receives UE capability information 506 from the UE 503 by an RRC message.
`
`The RNC 501 thus detects the type of the UE 503 from UE type information set
`
`in the UE capability information 506 and acquires the maximum Tx power of the
`
`30
`
`UE 503 from UE power class information included in the UE type information.
`The RNC 501 signals a maximum allowed UL Tx power 505 to the UE
`503, and determines the maximum UE transmitter power of the UE 503 using the
`
`maximum Tx power and the maximum allowed UL Tx power.
`
`When the E-DCH service starts, the RNC 501 signals the maximum UE
`
`35
`
`transmitter power 507 to the Node B 502 by an NBAP message. During
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`

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`W0 2006/104348
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`PCT/KR2006/001149
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`-11-
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`transmitting the E—DCH, the UE 503 signals its TX power margin 504 to the Node
`
`B 502 periodically on a physical channel. Thus, by receiving knowledge of the
`
`maximum UE transmitter power 507 and the Tx power margin 504, the Node B
`
`502 can calculate the Tx power of the UE 503 by using Equation (1). In this way,
`
`the Node B 502 acquires both the TX power and the TX power margin as the
`
`uplink channel information of the UE 503 and thus performs more efficient,
`
`optimal scheduling.
`
`FIG. 6 is a flowchart illustrating an exemplary operation for determining
`
`the maximum UE transmitter power to be included in an NBAP message in the
`
`10
`
`SRNC according to an embodiment of the present invention.
`
`The SRNC makes a decision as to which one to select between the
`
`maximum allowed UL TX power and the maximum TX power as the maximum
`
`UE transmitter power. The maximum allowed UL TX power can be common to all
`
`UEs within a cell or dedicated to a particular UE.
`
`Referring to FIG. 6, the RNC determines whether a maximum allowed
`
`UL TX power already exists for the UE in step 601. In the absence of the
`
`maximum allowed UL Tx power, the RNC sets the maximum UE transmitter
`
`power of the UE to the maximum Tx power corresponding to the power class of
`
`the UE, received from the UE, in step 605.
`
`In the presence of the maximum allowed UL Tx power,
`
`the RNC
`
`determines whether the maximum allowed UL Tx power is common information
`
`or dedicated information in step 602. Steps 601 and 602 are typical operations
`
`beyond the scope of embodiments of the present invention.
`
`15
`
`20
`
`If the maximum allowed UL TX power is common information,
`
`the
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`25
`
`SRNC compares the common maximum allowed UL TX power with the
`
`maximum TX power in step 603. If the common maximum allowed UL Tx power
`
`is less than the maximum Tx power, the RNC sets the maximum UE transmitter
`
`power to the common maximum allowed UL TX power in step 606.
`
`If the common maximum allowed UL TX power is equal to or greater
`
`30
`
`than the maximum TX power, the SRNC sets the maximum UE transmitter power
`
`to the maximum TX power in step 607.
`
`If the maximum allowed UL TX power is dedicated information in step
`
`602, the SRNC compares the dedicated maximum allowed UL TX power with the
`
`maximum Tx power in step 604. If the dedicated maximum allowed UL TX power
`
`35
`
`is less than the maximum Tx power, the RNC sets the maximum UE transmitter
`
`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`W0 2006/104348
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`-12..
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`power to the dedicated maximum allowed UL Tx power in step 608. If the
`dedicated maximum allowed UL Tx power is equal
`to or greater than the
`maximum Tx power, the SRNC sets the maximum UE transmitter power to the
`maximum Tx power in step 607.
`>4
`
`After setting the maximum UE transmitter power in steps 605 to 608, the
`RNC sig11als the maximum UE transmitter power to the Node B by an NBAP
`message or a user-plane message in step 609.
`
`Second Exemplary Embodiment
`
`In a second exemplary embodiment of the present invention, the RNC
`selects information required for the Node B between the maximum allowed UL
`
`Tx power and the maximum Tx power and signals the selected information to the
`
`Node B, and the UE transmits its Tx power to the Node B.
`
`More specifically,
`
`the UE signals its Tx power to the Node B on a
`
`physical channel, and the RNC signals the maximum UE transmitter power to the
`Node B by NBAP signaling via an Iub connection. The maximum UE transmitter
`
`power is set in a new NBAP message defined for the E-DCH, or in a modified
`
`one of a11 existing NBAP message.
`
`The RNC selects one of the maximum allowed UL Tx power and the
`maximum Tx power as the maximum UE transmitter power according to a
`predetermined criterion and signals the maximum UE transmitter power to the
`Node B by an NBAP message for the E-DCH or a user-plane message.
`FIG. 7 illustrates signaling among the RNC, the Node B and the UE
`
`according to the second exemplary embodiment of the present invention.
`
`Referring to FIG. 7, a UE 703 receives the E-DCH service and an RNC
`
`701 receives UE capability information 706 from the UE 703. The RNC 701 thus
`
`detects the type of the UE 703 from UE type information set in the UE capability
`information and also acquires the maximum Tx power of the UE 703 from UE
`
`power class information included in the UE type information.
`
`The SRNC 701 signals a maximum allowed UL Tx power 705 to the UE
`
`703, and determines the maximum UE transmitter power of the UE 703 using the
`
`maximum Tx power and the maximum allowed UL Tx power.
`
`When the E-DCH service starts, the SRNC 701 signals the maximum UE
`transmitter power to the Node B 702 by an NBAP message 707. During
`transmitting the E-DCH, the UE 703 signals its Tx power 704 to the Node B 702
`
`10
`
`15
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`20
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`25
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`30
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`35
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`Petitioner's Exhibit 1005
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`Petitioner's Exhibit 1005
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`WO 2006/104348
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`PCT/KR2006/001149
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`- 13 _
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`periodically on a physical channel. Thus, by receiving knowledge of the
`maximum UE transmitter power 707 and the TX power 704, the Node B 702 can
`
`calculate the TX power margin of the UE 703 by using Equation (1).
`In this way, the Node B 702 acquires both the TX power and the TX power
`margin and thus performs more efficient, optimal scheduling. The operation for
`determining the maximum UE transmitter power -to be included in an NBAP
`message in the RNC is performed in substantially the same manner as illustrated
`in FIG. 6 and thus further description is not provided.
`
`F