Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 1 of 16 PageID #: 229
`
`
`
`
`Exhibit “A”
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 2 of 16 PageID #: 230
`LENLESS
`
`US008385966B2
`
`US 8,385,966 B2
`(10) Patent No.:
`a2) United States Patent
`Lindholmetal.
`(45) Date of Patent:
`Feb. 26, 2013
`
`
`(54) METHOD, APPARATUS AND COMPUTER
`RRkeyTDhpewe
`PROCEDURES
`a.
`i.
`Inventors: Jari Lindholm,Palojoki (FI); Juha S.
`Korhonen, Espoo (FI)
`
`(75)
`
`(73) Assignee: Nokia Siemens Networks Oy, Espoo
`(FI)
`Sublectto vt eisclaimer. the termortis
`reSC H54(b)b ©5eyds Justed under
`wow
`(b)
`by
`ays.
`
`:
`
`:
`
`:
`
`.
`
`%
`
`soe:
`
`(*) Notice:
`
`OTHER PUBLICATIONS
`Editor (motorola), 3GPP Draft; 3rd. generation partnership project,
`mobile competence centre; vol. RAN WGI, Feb. 15, 2008, whole
`document.
`Interdigital Communications Corporation; “E-Ultra Uplink Power
`Control Proposal and Evaluation”; vol. RAN WG}, Jun. 22, 2007,
`whole document.*
`Editor (Motorola): 3GPP Draft; R1-08 1056—36213-81 0-CR, 3rd.
`Generation Partnership Project
`(3GPP), Mobile Competence
`Centre ; 650, Route Des Lucioles ; F-06921 Sophia-Antipolis
`Cedex ; France, vol. RAN WG1, No. Sorrento, Italy; 20080215, Feb.
`15, 2008, XP050109512.*
`NTT Docomo et al: “Transmission Power Control
`in E-UTRA
`Uplink” 3GPP Draft; R1-070870 Transmission Power Control in E-
`UTRA Uplink, 3rd Generation Partnership Project (3GPP), Mobile
`Competence Centre ;650, Route Des Lucioles ; F- 06921 Sophia-
`Antipolis Cedex ; France, vol. RANIWG1, No. St. Louis, USA;
`20070206, Feb. 6, 2007, XP05010.*
`(Continued)
`
`Primary Examiner — Crystal L Hammond
`(74) Attorney, Agent, or Firm — Harrington & Smith
`
`ABSTRACT
`(67)
`A first power control adjustmentstate g(i) and a second power
`control adjustment state f(i) are initialized for i=0 to each
`reflect an open loop powercontrol error. An initial transmit
`power for a shared uplink channel is computed using full
`pathloss compensation. The computedinitial transmit power
`depends on a preamble powerofa first message sent on an
`access channel, and the initial transmit poweris initialized
`with the second power control adjustmentstate (0). A third
`messageis sent from a transmitter on an uplink shared chan-
`nel at the initial transmit power. In various implementations,
`the powerfor i=0 on the uplink control channelis also initial-
`ized similarto the initial transmit powerfor the third message
`and using full pathloss compensation, and after the third
`message (and retransmissions of it), subsequent messages
`sent on the uplink shared channelare sent at a powerthat is
`computedusing fractional pathloss compensation.
`
`17 Claims, 5 Drawing Sheets
`
`(21) Appl. No.: 12/387,661
`(22) Filed
`Mav
`5, 2009
`iled:
`ay 5,
`
`(65)
`
`Prior Publication Data
`US2009/0286566 Al
`Nov. 19, 2009
`
`Related U.S. Application Data
`Lo,
`.
`srovisional application No. 61/126,617,filed on May
`(60)
`?
`:
`Int.€l
`(51)
`(2006.01)
`HOAB 7100
`455/522: 455/521
`,
`52) US.CI
`?
`ee eeeToren teens
`(52)
`(58) Field of Classification Search o0...0000..oe None
`See application file for complete search history.
`.
`References Cited
`U.S. PATENT DOCUMENTS
`5003,boven ae does sperawatet AL,
`coeseeesseeseneesson9
`9003/0119452 Al*
`6/2003 Se aL
`”
`455/69
`2004/0001429 Al*
`1/2004 Maetal. ......
`370/210
`2007/0149206 Al*
`6/2007 Wangetal.
`oe. 455/450
`2007/0201397 Al*
`8/2007 Zhang 0... 370/329
`
`
`
`(56)
`
`TO OTHERS
`OeNB(s)
`X2
`
`
`
`WIRELESS NETWORK 1
`
`(MME/S—GW)
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 3 of 16 PageID #: 231
`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 3 of 16 PagelD#: 231
`
`US 8,385,966 B2
`Page 2
`
`OTHER PUBLICATIONS
`
`IPWIRELESS: “Initial Access Procedure and Uplink Synchronisa-
`tion” 3GPP Draft; R1-060637, 3rd Generation Partnership Project
`(3GPP), Mobile Competence Centre ; 650, Route Des Lucioles ;
`F-06921 Sophia-Antipolis Cedex ; France, vol. RAN WGI, No.
`Denver, USA; 20060209, Feb. 9, 2006, XP050101560.*
`“374 Generation Partnershp Project; Technical Specification Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA)and Evolved Universal terrestrial Radio Access Network
`(E-UTRAN); Overall description; Stage 2 (Release 8)”. 3GPP TS
`36.300 V8.4.0 (Mar. 2008), 5 pgs.
`“374 Generation Partnership Project; Technical Specification Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA); Physical layer procedures (Release 8)”, 3GPP TS 36.213
`V8.2.0 (Mar. 2008), 30 pgs.
`Motorola: 3GPP Draft; R1-081056—36213-810-CR, 3rd Generation
`Partnership Project (3GPP), Mobile Competence Centre; vol. RAN
`WGI, No. Sorrento, Italy; Feb. 15, 2008, XP050109512.
`NTT DoCoMoet al: “Transmission Power Control in E-UTRA
`Uplink” 3GPP Draft, R1-070870; vol. RAN WGI, No. St. Louis,
`USA;Feb. 6, 2007, XP050104882.
`
`Qualcomm Europe: “RACH sequences and planning” 3GPP Draft;
`R1-062690; vol. RAN WGI, No. Seoul, Korea; Oct. 4, 2006,
`XP050103179.
`IPWireless: “Initial Access Procedure and Uplink Synchronisation”
`3GPP Draft; R1-060637; vol. RAN WG1, No. Denver, USA, Feb. 9,
`2006, XP050101560.
`NTT DoCoMoet al: “Transmission Power Control in E-UTRA
`Uplink” 3GPP Draft; R1-063316; vol. RAN WGI, No. Riga, Latvia;
`Nov.2, 2006, XP050103761.
`Interdigital Communications Corporation: “E-UTRA Uplink Power
`Control Proposal and Evaluation” 3GPP Draft; R1-072781; vol.
`RAN WGI, No. Orlando, USA; Jun. 22, 2007, XP050106465.
`Nokia et al: “Clarifications on the Out-of syne handling for UTRA
`TDD” 3GPP Draft; R1-00/1097; vol. RAN WGI, No. Berlin, Ger-
`many; Aug. 27, 2000, XP050093021.
`3GPP TS 36.321 V8.0.0 (Dec. 2007) 3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network;
`Evolved Universal Terrestrial Radio Access (E-UTRA) Medium
`Access Control (MAC) protocol specification (Release 8).
`
`* cited by examiner
`
`

`

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`
`U.S. Patent
`
`Feb. 26, 2013
`
`Sheet 1 of 5
`
`US 8,385,966 B2
`
`
`
`NB X2 77e ,
`‘ ( ))
`j
`eNB
`
`MME/S~GW
`h
`1\
`LN
`tA
`1
`
`\
`
`St
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`\
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`\
`(i
`|
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`
`FIG. 1A
`PRIOR ART
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 5 of 16 PageID #: 233
`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 5 of 16 PagelD#: 233
`
`U.S. Patent
`
`Feb. 26, 2013
`
`Sheet 2 of 5
`
`US 8,385,966 B2
`
`CONTENTION BASED RANDOM ACCESS PROCEDURE
`
`UE
`
`eNB
`
`RANDOM ACCESS PREAMBLE
`
`RANDOM ACCESS RESPONSE
`
`SCHEDULED TRANSMISSION
`
`CONTENTION RESOLUTION
`RANDOM ACCESS RESPONSE
`
`FIG.1B
`PRIOR ART
`
`NON-—CONTENTION BASED RANDOM ACCESS PROCEDURE
`
`UE
`
`eNB
`
`RA PREAMBLE ASSIGNMENT
`
`RANDOM ACCESS PREAMBLE
`
`FIG.1C
`PRIOR ART
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 6 of 16 PageID #: 234
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`
`U.S. Patent
`
`Feb. 26, 2013
`
`Sheet 3 of 5
`
`US 8,385,966 B2
`
`TOOTHERS
`
`co—
`
`(MME
`
`/S—GW)
`WIRELESSNETWORK1A
`
`
`
`FIG.2
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 7 of 16 PageID #: 235
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`
`U.S. Patent
`
`Feb. 26, 2013
`
`Sheet 4 of 5
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`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 8 of 16 PageID #: 236
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`
`U.S. Patent
`
`Feb. 26, 2013
`
`Sheet 5 of 5
`
`US 8,385,966 B2
`
`COMPUTE THE PREAMBLE POWER USING FULL PATHLOSS
`COMPENSATION
`
`408
`
` 402
`
`INITIALIZE FOR i=O A FIRST POWER CONTROL ADJUSTMENT STATE
`g(0) FOR AN UPLINK CONTROLCHANNEL AND A SECOND POWER
`
`CONTROL ADJUSTMENT STATE f(i) FOR AN UPLINK SHARED CHANNEL
`
`TO EACH REFLECT AN OPEN LOOP POWER CONTROL ERROR fe.g.,
`
`EQUATION [4a] AND [4b]}
`
`
`
`
`
`COMPUTE AN INITIAL TRANSMIT POWER FOR THE UPLINK SHARED
`CHANNEL USING FULL PATHLOSS COMPENSATION fe.g., EQUATION [5];
`- DEPENDS ON A PREAMBLE POWER OF A FIRST MESSAGE SENT
`ON AN UPLINK ACCESS CHANNEL je.g., PREAMBLE POWER OF
`THE RACH ACCESS REQUEST PREAMBLE},
`: LIZED WITH THE SECOND POWER CONTROL ADJUSTMENT
`
`
`
`
` 404
`
`
`STAT
`
`0
`
`
`
`
`
`THE THIRD MESSAGE HAS AN INDICATION OF A POWER DIFFERENCE
`BETWEEN THE INITIAL TRANSMIT POWER WHICH IS COMPUTED USING
`
`FULL PATHLOSS COMPENSATION AND A FRACTIONAL PATHLOSS
`COMPUTATION OF THE INITIAL TRANSMIT POWER fe.g., DIFFERENCE
`BETWEEN EQUATIONS [5] AND [1] FOR i=0}
`
`412
`
`SEND THE THIRD MESSAGE fe.g., MESSAGE 3} ON THE UPLINK
`SHARED CHANNEL fe.g., PUSCH} AT THE INITIAL TRANSMIT POWER
`
` |-*06
`
`COMPUTE AN UPDATED TRANSMIT POWER (FOR ALL MESSAGES
`AFTER MESSAGE 3 AND ANY OF ITS RE-TRANSMISSIONS) FOR THE
`PUSCH USING FRACTIONAL POWER CONTROL fe.g., EQUATION [1]}
`
`410
`
`FIG.4
`
`

`

`Case 6:14-cv-00982-KNM Document 29-1 Filed 04/16/15 Page 9 of 16 PageID #: 237
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`
`US 8,385,966 B2
`
`1
`METHOD, APPARATUS AND COMPUTER
`PROGRAM FOR POWER CONTROL
`RELATED TO RANDOM ACCESS
`PROCEDURES
`
`CROSS-REFERENCE TO RELATED
`APPLICATION
`
`This patent application claims priority under 35 U.S.C.
`§119(e)
`from U.S. Provisional Patent Application No.
`61/126,617, filed May 5, 2008, which is hereby incorporated
`by reference herein in its entirety, including Exhibits.
`
`10
`
`TECHNICAL FIELD
`
`The exemplary and non-limiting embodiments of this
`invention relate generally to wireless communication sys-
`tems, methods, devices and computer programs and, more
`specifically, relate to techniques for power control on differ-
`ent uplink messages sent from a communication device.
`
`BACKGROUND
`
`Various abbreviations that appear in the specification and/
`or in the drawing figures are defined as follows:
`3GPPthird generation partnership project
`DL downlink
`DRX discontinuous reception
`eNB EUTRANNode B (evolved Node B)
`EUTRANevolved UTRAN(also referred to as LTE)
`LTElong term evolution
`MAC medium access control
`MMEmobility managemententity
`Node B basestation
`OFDMAorthogonal frequency division multiple access
`PC powercontrol
`PDCCHphysical downlink control channel
`PDCPpacket data convergence protocol
`PDSCHphysical downlink shared channel
`PHYphysical
`PL path loss
`PRACHphysical random access channel
`PUSCHphysical uplink shared channel
`RACHrandom access channel
`RA-RNTIrandom access radio network temporary identi-
`fier
`RLCradio link control
`RRCradio resource control
`SC-FDMA single carrier, frequency division multiple
`access
`
`TA timing advance
`UE user equipment
`ULuplink
`UTRANuniversal terrestrial radio access network
`
`A proposed communication system known as evolved
`UTRAN (E-UTRAN, also referred to as UTRAN-LTE,
`E-UTRA or3.9 G) is currently under developmentwithin the
`3GPP. The current working assumptionis that the DL access
`technique will be OFDMA,and the UL access technique will
`be SC-FDMA.
`One specification of interest to these and other issues
`related to the invention is 3GPP TS 36.300, V8.4.0 (2008-03),
`3rd Generation Partnership Project; Technical Specification
`Group Radio Access Network; Evolved Universal Terrestrial
`Radio Access (E-UTRA) and Evolved Universal Terrestrial
`Access Network (E-UTRAN); Overall description; Stage 2
`(Release 8).
`
`20
`
`25
`
`30
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`2
`FIG. 1A reproduces FIG. 4-1 of 3GPP TS 36.300, and
`showsthe overall architecture of the E-UTRANsystem. The
`E-UTRANsystem includes eNBs, providing the E-UTRA
`user plane (PDCP/RLC/MAC/PHY) and control plane
`(RRC) protocol terminations towards the UE. The eNBs are
`interconnected with each other by means of an X2 interface.
`The eNBs are also connected by meansof an S1 interface to
`an EPC, more specifically toa MME (Mobility Management
`Entity) by means of a S1-MMEinterface and to a Serving
`Gateway (S-GW) by means of a S1-U interface. The S1
`interface supports a many-to-manyrelation between MMEs/
`Serving Gateways and eNBs.
`Reference can also be made to 3GPP TS 36.321, V8.0.0
`(2007-12), 3rd Generation Partnership Project; Technical
`Specification Group Radio Access Network; Evolved Univer-
`sal Terrestrial Radio Access (E-UTRA) Medium Access Con-
`trol (MAC) protocol specification (Release 8).
`Also of interest herein are the random access procedures of
`the LTE (E-UTRA)system. These procedures are described
`in 3GPP TS 36.300 v.8.4.0 at section 10.1.5 (attached to the
`priority document as Exhibit A), shown at FIG. 1B for the
`Contention Based Random Access Procedure and at FIG. 1C
`for the Non-Contention Based Random Access Procedure.
`
`and
`10.1.5.1-1
`reproduce FIGS.
`respectively
`These
`10.1.5.1-2 of 3GPP TS 36.300 v.8.4.0, and Exhibit A of the
`priority documentdetails the various steps shown.
`Briefly, the UE transmits a random access preamble and
`expects a response from the eNB in the form ofa so-called
`Message 2 (e.g., Random Access Response at FIGS. 1B and
`1C). Message 2 is transmitted on a DL shared channel DL-
`SCH (PDSCH, the PDCCH)and allocates resources on an
`UL-SCH (PUSCH). The resource allocation of Message 2 is
`addressed with an identity RA-RNTIthat is associated with
`the frequency and time resources of a PRACH, but is common
`for different preamble sequences. The Message 2 contains
`ULallocationsfor the transmissions of a Message3 in the UL
`(e.g., step 3 of the Contention Based Random Access Proce-
`dure at FIG. 1B).
`RACHpreambles are transmitted by the UEs using a full
`path-loss compensation PC formula. Thetarget is that recep-
`tion RX level of those preamblesat the eNBis the same, and
`so independent of path-loss. This is needed because several
`simultaneous preamble transmissions can take place in the
`same PRACHresource and in order to detect them, their
`powerat the eNB needs to be roughly the same to avoid the
`well-known near-far problem for spread spectrum transmis-
`sions. However subsequent uplink transmissions on the
`PUSCHare orthogonal, and so called fractional power con-
`trol can be used. This allows higher transmit TX powers for
`UEsthatare near the eNB because interference that those UEs
`
`generate to neighborcells is small as comparedto cell edge
`UEs. This method allows higher average uplink bit rates on
`the PUSCH.
`In general, the eNB does not know whatis the path-loss
`value used by the UEinits full PL compensation PC formula
`used for the UE’s RACH message. In the case of a UE being
`handed-over from another eNB, an estimate of the path-loss
`value could be provided to the target cell/eNB based on UE
`measurement reports sent to the serving eNB prior to the
`handover. However, for an initial access or for UL or DL data
`arrival this is not possible since there is no handover. Because
`of this, the eNB does not know the powerdifference between
`the UE’s RACH preamble transmission and the UE’s trans-
`mission using the PUSCH powerformula.
`It has been agreed that Message 2 contains a powercontrol
`command for transmission of Message 3, but the definition
`and objective of that commandis not yet specified. Therefore
`
`

`

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`US 8,385,966 B2
`
`3
`the eNB doesnot have sufficient information to give a correct
`powercontrol commandin response to the UE’s RACH mes-
`sage. The result then, and as mentioned above, is that the
`powerthat the UE uses for transmission of Message 3 is not
`knownto the eNBif the UE uses the PUSCH PC formula for
`
`sending Message3.
`The problem therefore may bestated as how bestto define
`a transition from the full path loss compensated preamble
`transmission to the PUSCH (fractional) power control sys-
`tem.
`
`SUMMARY
`
`In accordance with an exemplary embodimentofthe inven-
`tion is a method that comprises using a processorto initialize
`for 1=0 a first power control adjustment state g(0) for an
`uplink control channel and a second power control adjust-
`mentstate f(i) for an uplink shared channelto each reflect an
`open loop powercontrol error; using the processor to com-
`pute an initial transmit powerfor the uplink shared channel
`using full pathloss compensation, wherein the initial transmit
`powerdependson a preamble powerofa first message sent on
`an access channel, andis initialized with the second power
`control adjustmentstate {(0); and sending from a transmitter
`a third message on the uplink shared channelat the initial
`transmit power.
`In accordance with an exemplary embodimentofthe inven-
`tion is a computer readable memory storing a computer pro-
`gram that when executed by a processorresults in actions. In
`this embodimentthe actions comprise: initializing for i=0 a
`first power control adjustmentstate g(0) for an uplink control
`channel and a second powercontrol adjustmentstate f@) for
`an uplink shared channelto each reflect an open loop power
`control error; computing an initial transmit power for the
`uplink shared channel using full pathloss compensation,
`wherein the initial transmit power depends on a preamble
`powerofa first message sent on an access channel, and is
`initialized with the second power control adjustment state
`{(0); and outputting the initial transmit power for transmis-
`sion of a third message on the uplink shared channel.
`In accordance with an exemplary embodimentofthe inven-
`tion is an apparatus which comprisesat least a processor and
`a transmitter. The processoris configuredto initialize, for i=0,
`a first power control adjustmentstate g(0) for an uplink con-
`trol channel and a second powercontrol adjustmentstate f(i)
`for an uplink shared channel to each reflect an open loop
`power control error, and configured to compute an initial
`transmit powerfor the uplink shared channel using full path-
`loss compensation,
`in which the initial
`transmit power
`depends on a preamble powerofa first message sent on an
`access channel, and the initial power is initialized with the
`second powercontrol adjustmentstate f(0). The transmitteris
`configured to send a third message on the uplink shared
`channelat the initial transmit power.
`These and other aspects of the invention are detailed with
`particularity below.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The foregoing and other aspects of the exemplary embodi-
`ments of this invention are made more evident in the follow-
`
`ing Detailed Description, when read in conjunction with the
`attached Drawing Figures.
`FIG. 1A reproduces FIG. 4-1 of 3GPP TS 36.300, and
`showsthe overall architecture of the E-UTRANsystem.
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`FIGS. 1B and 1C respectively reproduce FIGS. 10.1.5.1-1
`and 10.1.5.1-2 of 3GPP TS 36.300 v8.4.0, Contention Based
`Random Access Procedure and Non-Contention Based Ran-
`dom Access Procedure.
`FIG. 2 showsa simplified block diagram of various elec-
`tronic devices that are suitable for use in practicing the exem-
`plary embodiments of this invention.
`FIGS. 3-4 are logical flow diagrams that illustrate the
`operation ofmethods, and the result of execution of computer
`programsinstructions by the data processor such as that
`shown in FIG.2 according to various specific embodiments of
`the invention.
`
`DETAILED DESCRIPTION
`
`In the specific examples given below, the problem solved
`by those embodiments is how the powercontrol formulas for
`PUSCH and PUCCHare taken in use during or after the
`Random Access procedure.
`To the inventors’ knowledge this problem has not been
`solved before. Operation according to 3GPP TS 36.213
`v.8.2.0 (attached to the priority document as Exhibit B)is that
`Message3 (see FIG. 1B) is transmitted using the PUSCH PC
`formula taking into account the PC commandreceived from
`the eNB in Message 2 (see FIGS. 1B and 1C). However,this
`does not specify how the UE specific parameters of the
`PUSCH and PUCCHpowercontrol formulas are initialized.
`The PUSCH PCformula for the UE in the Ah subframe is
`defined at section 5.1.1.1 of 3GPP TS 36.213 v8.2.0 as fol-
`lows:
`
`Poyscei)=min{Pyz4y510 logy o(Mpusculi))+
`Po_puscul)+@PL+ApATFG)+f) } (dBm);
`
`(
`
`where,
`Pasay is the maximum allowed powerthat depends on the
`UEpowerclass
`Meuscp(i) is the size of the PUSCHresource assignment
`expressed in numberof resource blocks valid for sub-
`framei.
`Popuscn) is a parameter composed ofthe sum of a 8-bit
`cell specific nominal component Pgnosgnar_pusce MW)
`signalled from higherlayers forj=0 and 1 in the range of
`[-126, 24] dBm with 1 dB resolution and a 4-bit UE
`specific component Pouspuscy (i) configured by
`RRCfor j=0 and 1 in the range of [-8, 7] dB with 1 dB
`resolution. For PUSCH (re)transmissions correspond-
`ing to a configured scheduling grant then j=0 and for
`PUSCH(re)transmissions corresponding to a received
`PDCCH with DCI format0 associated with a new packet
`transmission then j=1.
`ae{0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} is a 3-bit cell specific
`parameter provided by higher layers
`PL is the downlink pathloss estimate calculated in the UE
`AyATF(Q))=10 log,,(2”°" *s-1) for K.=1.25 and 0 for
`K,=0 where K, is acell specific parameter given by RRC
`TF) is the PUSCHtransport formatvalid for subframe
`1
`
`rate=Nyyeo/Nez where
`MPR=modulationxcoding
`Nyro are the numberof information bits and Nz; is
`the number of resource elements determined from
`TF) and Maysce (i) for subframe i
`8pusczris a UE specific correction value, also referred to as
`a TPC commandandis included in PDCCH with DCI
`
`format 0 or jointly coded with other TPC commandsin
`PDCCHwith DCI format 3/3A. The current PUSCH
`powercontrol adjustmentstate is given by f(1) which is
`defined by:
`
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`5
`f{M=f0-1)48poscHGi-Kpuscy) if f(*) represents accu-
`mulation
`
`where f(0)=0 and Kpyscy=4
`The UEattempts to decode a PDCCH of DCI format
`0 and a PDCCHof DCIformat 3/3A in every sub-
`frame except when in DRX
`8puscy—0 ABfora subframe where no TPC command
`is decoded or where DRX occurs.
`The 8z7;sc7 dB accumulated values signalled on
`PDCCHwith DCI format 0 are [-1, 0, 1, 3].
`The d,uscz dB accumulated values signalled on
`PDCCHwith DCI format 3/3A are one of [-1, 1] or
`[-1, 0, 1, 3] as semi-statically configured by higher
`layers.
`If UE has reached maximum power, positive TPC
`commandsare not accumulated
`
`If UE has reached minimum power, negative TPC
`commandsshall not be accumulated
`UEshall reset accumulation
`
`at cell-change
`when entering/leaving RRCactive state
`when an absolute TPC commandis received
`when Pyoxpuscry (J) is received
`when the UE(re)synchronizes
`{M=SpuscHG-—Keuscy) if fC) represents current abso-
`lute value
`
`where 8prscHi-Kpuscey) Was signalled on PDCCH
`with DCI format 0 on subframe i-Kpyscz7
`where Kpyscx=4
`The 8z7;sc77 dB absolute values signalled on PDCCH
`with DCI format 0 are [-4, -1, 1, 4].
`f@)=fG-1) fora subframe where no PDCCHwith DCI
`format 0 is decoded or where DRX occurs.
`
`f(*) type (accumulation or current absolute) is a UE
`specific parameterthat is given by RRC.
`The PUCCH PCformula for the UEinthe ith subframeis
`defined at section 5.1.2.1 of 3GPP TS 36.213 v8.2.0 as fol-
`lows:
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`Peuccu(i=min{PyaxPo_puccatPL+Are_puccr
`(IF)+g(i)} (dBm);
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`
`[2]
`
`where
`ArepuccH(IF) table entries for each PUCCH transport
`format (TF) defined in Table 5.4-1 in [3] are given by
`RRC
`
`Each signalled Ayepuccy(TF) 2-bit value corresponds
`to a TF relative to PUCCH DCI format0.
`Popuccy iS a parameter composed of the sum ofa 5-bit
`cell specific parameterP,yommnar_puccry Provided by
`higher layers with 1 dB resolution in the range of [-127,
`-96] dBm and a UEspecific component Pouspuccy
`configured by RRC in the range of [-8, 7] dB with 1 dB
`resolution.
`dpuccyis a UE specific correction value,also referred to as
`a TPC command,included ina PDCCH with DCI format
`1A/1/2 or sent jointly coded with other UE specific
`PUCCHcorrection values on a PDCCH with DCIfor-
`mat3/3A.
`The UEattempts to decode a PDCCH with DCI format
`3/3.A and a PDCCHwith DCI format 1 A/1/2 on every
`subframe except when in DRX.
`Spuccy from a PDCCH with DCI format 1A/1/2 over-
`rides that from a PDCCHwith DCI format 3/3A when
`
`both are decoded in a given subframe.
`8puccy=0 dB for a subframe where no PDCCH with
`DCI format 1A1/2/3/3A is decoded or where DRX
`occurs.
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`g()=20-1)4+AprceHI-Keucez) Where g(i) is the cur-
`rent PUCCH powercontrol adjustment state with ini-
`tial condition g(0)=0.
`The 6,.;¢c7, dB values signalled on PDCCHwith DCI
`format 1A/1/2 are [-1, 0, 1, 3].
`The 6,.;¢c7, dB values signalled on PDCCHwith DCI
`format 3/3A are [-1, 1] or [-1, 0, 1, 3] as semi-
`statically configured by higherlayers.
`If UE has reached maximum power, positive TPC
`commandsare not accumulated
`
`If UE has reached minimum power, negative TPC
`commandsshall not be accumulated
`UEshall reset accumulation
`at cell-change
`when entering/leaving RRCactive state
`when Pyurpuccy(l) is received
`when the UE(re)synchronizes
`The preamble PC formula for the UE’s transmission on the
`RACHis:
`
`Preamble?rargettPL+APampyp(ABm),
`where
`Parger 18 the broadcastedtarget power;
`PLis the path loss that UE estimates from DL; and
`APnampup is the power ramp-up applied for preamble
`retransmissions.
`
`[3]
`
`As can be seen above at equation [1], the formula for
`Pruscy (1) depends on the current PUSCH powercontrol
`adjustmentstate which is termed f(i). For accumulation,this
`adjustment state depends on previous adjustments made in
`previous subframes, even for the case where f(1) is set to an
`absolute value since it is set for the subframe G—-Kpyjscz)-
`When the UE first sends data on the PUSCH,there is no
`previous subframeandso i=0, which is addressed in 3GPP TS
`36.213 v8.2.0 as zeroing out the entire term so that {(0)=0.
`Further, whileit is true that the UEisto reset its accumulation
`whenever
`it
`receives
`a
`new UE-specific
`portion
`Pourpuscnl) of the Popuscx(j) (and similarly for
`Popuccy), after a RACH access the UE has received no
`UE-specific portion and so it lacks that parameter to reset
`according to 3GPP TS 36.213.
`Also, at equation [2] the power control formula for the
`PUCCH Ppyeccy(i) depends on the current PUCCH power
`control adjustment state which is termed g(i) and which also
`depends on previous adjustments made in previous PUCCH
`subframes. When the UE first sends a message on the
`PUCCH,there is no previous subframe and so 1=0, whichis
`similarly addressed in 3GPP TS 36.213 v8.2.0 as zeroing out
`the entire term so that g(0)=0.
`Consider the case for contention-less random access such
`
`as that shown at FIG. 1C, where the UE transmits preambles
`that are dedicated for that UE. The embodimentsofthe inven-
`
`tion described for contention-less random access may also be
`used for contention based random access when it is consid-
`
`ered that collisions will be infrequent enough in the conten-
`tion-based system so as not to substantially affect operation in
`the cell.
`
`According to an embodiment of the invention, the UE
`receives a power control command (e.g., AP,,.) in the pre-
`amble response from the eNB, which is Message 2. The UE
`then initiates the PC formula for PUSCH and PUCCH,or
`compensates open loop error, according to the following
`equations:
`
`Po_ug_puscuth0)-APpctAPampup
`
`Po_ve_puccyt8(0)=APpctAP,ampup
`
`[4a]
`
`[4b]
`
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`7
`These equations say that the sum of the UE specific power
`control constants (Poyppuscy Of Poue_puccy) and the
`powercontrolinitial states (f{(0) or g(0)) is equal to the open
`loop powercontrol error, taking into account the preamble
`power ramp-up. AP,, 1s here assumedto be the difference
`between the target preamble power and the power that eNB
`actually observes. The actual value of AP, may be signalled
`directly by the eNBas the power control command,or to save
`on signalling overhead the eNB may explicitly signal a bit
`sequence (one, two or more bits) as the power control com-
`mand whichthe receiving UE uses as an index to look up the
`true value AP,that is associatedin a locally stored table with
`that index.
`There are several options for dividing the correction
`between the UE specific constants and the power control
`states. For example, in a first option the UE specific power
`control terms PyyepuscH aNd Povgpuccy could be ini-
`tialized to zero and the whole correction is covered by f(0) or
`g(0). In this case then equations 4a and 4b would read f(0)=g
`(0)=APpctAP,ampup for initiating the closed loop correction
`values for PUCCH and PUSCH. This can be always done as
`far as the powercontrol state fis accumulated. (According to
`current 3GPP agreements g is always accumulating.) How-
`ever, if fis modified with absolute PC commands,its dynamic
`range is limited and may not cover the whole open loop
`correction APpc+AP,ampup- If this happens, the part of the
`correction that cannot be included in f(0) could be taken into
`account by adjusting Pyorpuscy AS another example, a
`second option is to take the open loop error into account
`adjusting principally the UE specific power control terms
`Po_ve_puscy 20d Pougpuccy. These parameters have a
`limited range andthepart ofthe open loop error that cannot be
`compensated by adjusting these UE specific constants could
`be coveredby initializing the powercontrol states f(0) or g(0)
`to a nonzero value. The benefit of the first option is that the
`eNB would know the UE specific constants Pougpusc
`and Pooepuccy (at least when fis accumulating), which
`might makelater adjustments ofthese constants easier. How-
`ever, the second option could be more natural because the
`purposeof the UE specific constants is mainly to compensate
`systematic errors in the PL determination and TX power
`setting and these are already visible as an error in the open
`loop powercontrol ofthe preambles. Ofcourse, the above two
`optionsare presented only as non-limiting examples andthis
`aspect of the invention is not limited to only those two.
`For the case of a dedicated preamble such as is shown at
`FIG. 1C or when the preamble collisions of a contention-
`based system are otherwise infrequent, the power for Mes-
`sage 3 may be generated by using the PUSCH PC formula
`directly according to the above explained embodimentofthe
`invention. This may lead to UE transmit TX powerthat is
`unnecessarily high, but the inventors do not see this as a
`problem.
`The inventors have determinedthat a problem could arise
`in the above explained procedure, specifically where two UEs
`transmit the same preamble sequence and use fractional PL
`compensation for Message 3. The problem appears mostpro-
`nounced when the preamble of a UE with a large PL is
`received at the eNBstrongerthan the preamble of another UE
`with small PL. The fractional PC could result in Message 3 of
`the UE with the smaller PL being received at the eNB with a
`stronger signal strength than the Message 3 ofthe UE with the
`larger PL. This would of course make detection by the eNB of
`the weaker Message3 less likely, despite the fact that in the
`above scenario the weaker Message3 is from the UE who has
`received correct timing advance. Decoding of the stronger
`Message3 is likely to fail because the timing advance of a
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`wrong UE has been used when transmitting it. Further, if the
`timing advance for Message 3 transmissionsare set based on
`the preamble of the UE with the larger PL, then the UE with
`the smaller PL would use a large power and the wrong TA
`value when transmitting its Message 3, and thereby generate
`interf