Title of Invention

A USER EQUIPMENT FOR TRANSMISSION POWER CONTROL AND METHOD THEREOF

Abstract

Outer loop/weighted open loop power control controls transmission power levels in a spread spectrum time division duplex communication station. A first communication station (110) transmits a communication to a second communication station including target adjustment information generated at the first station on the basis of measured error rates of communications from the second station to the first station. The second station receives the communication and measures its received power level. Based on in part the received communication's power level and the communication's transmission power level, a path loss estimate is determined. A quality of the path loss estimate is also determined. The transmission power level for a communication from the second station to the first station is based on in part weighting the path loss estimate in response to the estimate's quality and based on the receive target adjusted by the target adjustment information transmitted from the first station.

Full Text

Field of the Invention This invention relates to a method for transmission power control of a user equipment atid-a user equipment using transmission power control in a time division duplex communication system. Background of the Invention Figure 1 depicts a wireless spread spectrum time division duplex (TDD) communication system. The system has a plurality of base stations 30|-307. Each base station 30| communicates with user equipment (UEs) 32\-32] in its operating area. Communications transmitted from a base station 30| to a UE 321 are referred to as downlink communications and communications transmitted from a UE 321 to a base station 30| are referred to as uplink communications. In addition to communicating over different frequency spcctrums, spread spectrum TDD systems carry multiple communications over the same spectrum. The multiple signals are distinguished by their respective chip code sequences (codes). Also, to more efficiently use the spread spcctt j;n. TDD systems as illustrated in 1 !gu;e 2 use repealing friKncs 3-4 divided into a number of time slots 36r36n, such as sixteen lime slots. In such systems, a communication is sem in selected time slots oOi-oo., using selected codes. Accordingly, one frame 34 is capable of carrying multiple1 communications distinguished by hoih time Most TDD systems adoptively control transmission pov/er levels. In n TDD system, mnny communications may share the same time slot and spectrum. When a UH 32j or base station 30| is receiving a specific communication, all the other communications using the same time slot and spec!rum cause interference to the specific communication. Increasing the transmission powa !JYC! of one communication degrades the sign.il quality of all other communications within '.liai time slot and spectrum. However, reducing the transmission po\\er level loo far results in undesirable signal to noise ratios (SNRs) '.Hid bit error nttes (DliRs) at the receivers. To maintain both the signal quality of communications and low transmission power levels, transmission power control is used. One approach using transmission power control in a code division multiple access (CDMA) communication system is described in U.S. Patent No. 5,056,109 (Gilhousen el al.). A transmitter sends a communication to a particular receiver. Upon reception, the received " signal power is measured. The received signal power is compared to a desired received signal power. Based on the comparison, a control bit is sent to the transmitter either increasing or decreasing transmission power by a fixed amount. Since the receiver sends a control signal to the transmitter to control the transmitter's power level, such power control techniques are commonly referred to as closed loop. Under certain conditions, the performance of closed loop systems degrades. For instance, if communications sent between a UE and a base station are in a highly dynamic environment, such as due to the UE moving, such systems may not be able to adapt fast enough to compensate for the changes. The update rate of closed loop powXr. control in TDD is typically 100 cycles per second which is not sufficient for fast fading channels. Accordingly, there is a need for alternate approaches to maintain signal quality and low transmission power levels. Statement of the i i n c The present invention discloses a method !r transmission power control of a user equipment using a mcasuivd interference level and a pathloss climate in a \vireless lime division duplex communication system using code division multiple access, the method churaetcri/ed in that: determining a long term average of pathloss estimates; and multiplying a first weighting factor, a. by the determined pathloss estimate, producing a weighted pathloss estimate, multiplying (1-a) to the determined long term average of pathloss estimates, producing a weighted long term pathloss estimate, providing a target signal to interference ratio, updating the target signal to interference ratio using outer loop power commands; and determining a transmission power level of the user equipment by adding the weighted palhloss estimate to the weighted long term pathloss estimate to the measured interference level to the updated Ursiel signal io inlcHcrence ratio io a constant value. Summary Outer loop/weighted open loop power control controls transmission power levels in a spread spectrum time division duplex communication system. At a first communication station, errors are measured in a received communication from a second communication station. Based on in part the measured errors, an adjustment in a target level is determined. The first station transmits a communication and the target adjustment to the second station. The second station measures the first station's communication's received power level. Based on in part the received power level, a path loss is determined. The target level is adjusted in response to receiving the target adjustment. The quality of the path loss is determined with respect to a subsequent communication to be transmitted from the second station. The second station's transmission power level for the subsequent communication is adjusted based on in part the determined path loss, the determined quality and the adjusted target level. Brief Description of The Accompanying Drawings Figure 1 illustrates a prior art TDD system. Figure 2 illustrates time slots in repeating frames of a TDD system. Figure 3 is a flow chart of outer loop/weighted open loop power control. Figure 4 is a diagram of components of two communication stations using outer loop/weighted open loop power control. Figure 5 is a graph of" (lie performance of 'outer loop'weighted open loop. \\or.'hted open loop a;~iJ closed loop power control systems. Figure 6 is a graph of the three systems performance in terms of Block Error Rate (BLBR). Detailed Description of the Preferred Embodiments The preferred embodiments will be described with reference to the drawing figures where like numerals represent like elements throughout. Outer loon/weighlcd open loop power •v control will be explained using the flow chart of Figure 3 and the components of two simplified communication stations 110,112 as shown in Figure 4. For the following discussion, the communication station having ils transmitter's power controlled is re I erred to as the transmitting station 112 and the communication station receiving power controlled communications is referred to as the receiving station 1 10. Since outer loop/weighted open loop power control may be used for uplink, downlink or both types of communications, the transmitter having its power controlled may be associated with the base station 30], UE 32| or both. Accordingly, if both uplink and downlink power control are used, the receiving and transmitting station's components are associated with both the base station 30i and UE 32]. The receiving station 110 receives various radio frequency signals including communications from the transmitting station 112 using an antenna 78, or alternately, an antenna array, step 38. The received signals are passed thorough an isolator 66 to a demodulator 68 to produce a baseband signal. The baseband signal is processed, such as by a channel estimation device 70 and a data estimation device 72, in the time slots and with the appropriate codes assigned to the transmitting station's communication. The channel estimation device 70 commonly uses the training sequence component in the baseband signal to provide channel information, such as channel impulse responses. The channel information is used by the data estimation device 72, the interference measurement device 74, and the transmit power calculation device 76. The data estimation device 72 recovers data from the channel by estimating soft symbols usiim the channel information. Prior to transmission of the communication from the transmitting station 1 12. the data signal of the communication is error encoded using an error detection/correction encoder 1 10. The cr;i'i e^Yniiiit: scheme is ivpicaiK a ciiciii.t; redundancy code (CRO l'niln.\ di hy a forward olion encoding, although UsiiU' ihu voit'SMiibols produced b\ iiv Jala estimation device 72. .in envs .ieuvlion device 112 delects errors in the soft symbols. A processor 111 analy/cs the detected error and determines an error rate for the received communication, step 39. Based on the error rate, the processor 1 1 1 determines the amount, if any. a target level, such as a target signal to mierlereiice ration (.SlRrAiuji-.r), ncc^> 10 'K' changed at the transmuting siaiion 1 12, step 40. Based or; the determined amount, a targe: adjustment signal is gcnciaTev! by the target adjustment generator 114. The target adjustment is subsequently sent 10 ihc transmitting station, step 41. The target adjustment is signaled to the transmitting station 112. such as using a dedicated or a reference channel as shown in Figure 4, step 4 1 . One technique to determine the amount of adjustment in the target level uses an upper and lower threshold. If the determined error rate exceeds an upper threshold, the largel level is set at an unacceptably low level and needs to be increased. A target level adjustment signal is sent indicating an increase in the target level. If the determined error rate is below a second threshold, the target level is set at an unnecessarily high level and the target level can be decreased. By reducing the target level, the transmitting station's power level is decreased reducing interference to other communications using the sam'X time slot and spectrum. To improve performance, as soon as the error rate exceeds the upper limit, a target adjustment is sent. As a result, high error rates arc improved quickly and lower error rates are adjusted slowly, such as once per 10 seconds. If the error rate is between the thresholds, a target adjustment is not sent maintaining the same target level. Applying the above technique to a system using CRC and FEC encoding follows. Each CRC block is checked for an error. Each time a frame is determined to have an error, a counter is incremented.'As soon as the counter exceeds an upper threshold, such as 1.5 to 2 times the dosircd block error rate (BLER), a target adjustment is sent increasing the target level. To adjust the S]RTARGI-T at the transmitting station 112, the increase in the S!RTARGHT is sent (SIRiNr), which is typically in a range of 0.25 dB to 4 dB. If the number of CRC frames encountered exceeds a predetermined limit, such as 1000 blocks, the value of the counter is compared to a lower threshold, such as 0.2 to 0.6 times the desired BLER. If the number of counted block errors is below the lower threshold, a target adjustment signal is sent tuYU'o.-iiii:.: tin.- uirgei lc\cl, S'RDH . A typical range of SIR|,(, is ().2:: ;o -> JR. The value of SIR;,i, may be based on S1R|\, ami a tat-yet block error rate. BLER. ^,.\ \. The BLERrA« is based on the type of service. Atypical range for the BLERT,\K SIR,,,:, =.- S1R,M- x BLER IAR«,I i ' (1 -ULERIARli,..r) Equation 1 If the couin is between the thiesbouis loi the predetermined bloek limit, a taigct adjustment .signal is not sent. Alternately, a single threshold may be used. If the error rate exceeds ihe threshold, the lar.uet level is increased. If the error rate is below the threshold, the target is decreased. Additionally, the target level adjustment signal may have several adjustment levels, such as from 0 dB to ±4 dB in 0.25 dB increments based on the difference heiueon the eiTor rate and the desired error rate. The interference measurement device 74 of the receiving station 110 determines the interference level in dB, IRS, within the channel, based on either the channel information, or the soft symbols generated by the data estimation device 72, or both. Using the soft symbols and channel information, the transmit power calculation device 76 controls the receiving station's transmission power level by controlling the gain of an amplifier 54. For use in estimating the pathloss between (he receiving and transmitting stations 110, 112 and sending data, the receiving station 1 10 sends a communication to the transmitting station 1 12, step 41. The communication may be sent on anyone of the various channels. Typically, in a TDD system, the channels used for estimating pathloss arc referred to as reference channels, although other channels may be used. If the receiving station 110 is a base station 30i, the communication is preferably sent over a downlink common channel or a common control physical channel (CCPCH). Data to be communicated to the transmitting station 112 over the reference channel is referred to as reference channel data. The reference data may include, as shown, the interference level, IRS, multiplexed with other reference data, such as the transmission power level, TRS- The interference level, !( level. IKS. may be sent in other channels, such as a signaling channel. 1 ho reference channel daia is generated by a reference channel data generator 56. The reference data is assigned one or multiple resource units based on '.he communication's bandwidth requirements. A spreading and training sequence insertion device 58 spreads ihe reference channel data and makes the spread reference data time-multiplexed with a training sequence in the appropriate time slots and codes of the assigned resource units. The resulting sequence is referred to as a communication hurst. The communication burst is subsequently amplified by an amplifier (SO. Ihe amplified communication bm.st may be summed by a MUD device 62 with anv other cornmur.KMiion hurst created through devices, such as a data venerator 50. spreading and irainiiu: sequence insertion device 52 and amplifier 54. I he summed communication hursts are modulated by a modulator 64 The modulated signal i:, pu>scd thorough an isolator 66 and radiated b> an antenna 78 .^. shoun or. alternately, iim>u communication can be any of those known to those skilled in the art. such as direct phase shift keying (DPSK) or quadrature phase shift keying (QPSK). The antenna 82 or, alternately, antenna array of the transmitting station 112 receives various radio frequency signals including the target adjustments. The received signals are passed through an isolator 84 to a demodulator 86 to produce a baseband signal. The baseband signal is processed, such as by a channel estimation device 88 and a data estimation device 90, in the time slots and with the appropriate codes assigned to thV .communication burst of the receiving station 110. The channel estimation device 88 commonly uses the training sequence component in the baseband signal to provide channel information, such as channel impulse responses. The channel information is used by the data estimation device 90 and a power measurement device 92 The power level of the processed communication corresponding to the reference channel, RTS, is measured by the power measurement device 92 and sent to a pathloss estimation device 94, step 42. Both the channel estimation device 88 and the data estimation device 90 are capable of separating the reference channel from all other channels. If an automatic gain control device or amplifier is used for processing the received signals, the measured power level is adjusted to correct for the gain of these devices at cither the power measurement device 92 or path!o>s e.-.iiin.;ii To determine thr- path loss. I.., the transmitting station 1 12 also requires the communication's transmitted power level. I KV The communication's transmitted power level, T«s , may be seni along with the communication's data or in a signaling channel. If the power love], TK.S. is sent along with the communicaiion's data, the data estimation device 9(1 interprets the power level and sends the interpreted power level to the pathloss estimation device 94. If the receiving station I 10 is a base station ."> 110,112, step 43. Additionally, a long term average of the pathloss, Lo, is updated, step 44. The long term average of the pathloss, Lo, is an average of the pathloss estimates. In certain situations, instead of transmitting the transmitted power level, TRS) the receiving station 110 may transmit a reference for the transmitted power level. In that case, the pathloss estimation device 94 provides reference levels for the pathloss, L. Since TDD systems transmit downlink and uplink communications in the same frequency spectrum, the conditions these communications experience are similar. This phenomenon is referred to as reciprocity. Due to reciprocity, the path loss experienced for the downlink will also be experienced for the uplink and vice versa. By adding the estimated path loss to a target level, a transmission power level for a communication from the transmitting station 112 to the receiving station 11 0 is determined. y If a time delay exists between the estimated path loss and the transmitted communication, the path loss experienced by the transmitted communication may differ from the calculated loss. In TDD where communications are sent in differing time slots 36|-36n, the time slot delay between received and transmitted communications may degrade the performance of an open loop power control system. To overcome these drawbacks, weighted open loop power control determines the quality of the estimated path loss using a quality measurement device 96. step 45. a:u! \\eighl:, ihc cs;;:n.;icJ path loss accorJi;:cly. !.. a:;d !':;tg term average ol'lhc pal hi. ;.•.:,. lo. To enhance perform.-we fun her in outer loop/weighifd one;: loop, a target level is adpisu'd A processor 103 coin ens the soft symbols produced by the data estimation device 90 lo bus and extracts the target adjustment infomalion, such as a SIR|AKt;i:i adjustment. A larget update device 101 adjusts the target level using the target adjustments, step 46. The target level may be a SIR i AK The following is one outer loop/weighted open loop power control algorithm. The transmitting station's transmission power level in decibels, PTS, 0 determined using Equation 2. PTS = SIRrARGin + IKS + «(L-U) + U + CONSTANT VAU IE Equation 2 The SJRiARGi-.r has an adjusted value based on the received get adjustment signals. For the downlink, the initial value of SIR.TARGET is known at the transmitting station 112. For uplink power control, SlRrARniT is signaled from the receiving station 110 to the transmitting station 112. Additionally, a maximum and minimum value for an adjusted S!RTARGI:I niay also be signaled. The adjusted SlRiARor-r is limited to the maximum and minimum values. IRS is the measure of the interference power level at the receiving siauon 110. !. is the path loss estimate in decibels. TKS -Ris- f'" the most recent time slo'. ?6r3().1lh;]i ihc path loss was estimated. Uj. the long term average of OK- path loss in decibels, is the running average of llio palhloss estimate, I... The CONSTANT YALIJK is a correction term. The CONSTANT VALUE corrects for differences in the uplink and downlink channels, such as to compensate for differences in uplink and downlink gain. Additionally, the CONSTANT VALUE may provide correction if the transmit power reference level of the receiving station is transmitted, instead of the actual transmit powei. '1 ps II" the receiving station 110 is a base station, the CONSTANT VALUE is preferably sent via a ! ayer 3 message The weighting value, a. is a measure of the quality of the estimated path loss and is, preferably, based on (lie number of time slots 36]-36,, between the time slot, n. of the last path loss estimate and :lie first time slot of the communication transmitted by ihe iransniir.mg station 1 12. The vaine 01 a is between /ero and one. Generally, if ihe iime difference betucon the lime slots is small, the recent path loss estimate \\ili he fairly accuniie and u is set Ji a value close to one. By contrast, if the time difference is large, the path loss estimate may not be accurate and the long term average path loss measurement is most likely a better estimate for the path loss. Accordingly, a is set at a value closer to one. Equations 3 and 4 are equations for determining a. a=l-(D-i;/(Dinax-l) Equations a = max { 1 -(D-iyCDm.^^^ -1),0} Equation 4 The value, D, is the number of time slots 36i-36n between the time slot of the last path loss estimate and the first time slot of the transmitted communication which will be referred to as the time slot delay. If the delay is one time slot, a is one. Dmax is the maximum possible delay. A typical value for a frame having fifteen time slots is seven. If the delay is D,mx, a is zero Dmax-aiumed is the maximum allowed time slot delay for using open loop power control. If the delay exceeds Dmax-a!iowcd» open loop power control is effectively turned off by selling a=0. Using the transmit power level, PTS, determined by a transmit power calculation device •98 the transmit power of the transmitted communication is set. Figures 5 and 6 compare the performance of the weighted outer loop/open loop, open loop and closed loop systems. The simulations in Figures 5 and 6 were performed for a slightly iiiilereni version o; ihc outer loop \wiulucti ope;, !m;ji algorithm. In ihi* \cr.Mon. the target SIR is updated e\ery block. A SlR]..\K'i! i is increased if a block error was detected and decreased i! no block error was detected The outer loop/weighted open loop system used Fquation 2. l:A)u.iiion 3 \\as used to calculate u. The simulations compared the performance of the systems controlling a UH's 32j transmission power level. For the simulations, 16 CRC bits were padded every block. In the simulation, each block was 4 frames. A block error was declared when at least two raw bit errors occur over a block. The uplink communication channel is assigned one time slot per frame. The target for the block error rale is 10 %. I he S!Ri,Ai«,ri is updated every 4 frames. The simulations address the performance of these systems for a UF 32, travelling at 30 kilometers per hour. The simulated base station used two-antenna diversity for reception with each antenna having a three finger RAKF receiver. The simulation approximated a realistic channel ami SIR estimation based on a midamhle ..jquciice of hi;;.;; ;.;;,; I Hold in ihc presence of a.^ii::1. v v. hue Gai.sjian nohj (AV.'(j\';. !'!v simulation used an International Telecommunication i Jnion (ITU) Pedestrian B type channel and QPSK modulation. Interference levels were assumed to have no uncertainty. Channel coding schemes were not considered. L() was set at 0 db. Graph 120 of Figure 5 shows the performance as expected in terms of the required Es/No for a BLER of 10' as a function of time delay between the uplink time slot and the most recent downlink time slot. The delay is expressed by the number of time slots. Es is the energy of the complex symbol. Figure 5 demonstrates that, when gain/interference uncertainties are ignored, the performance of the combined system is almost identical to that of weighted open loop system. The combined system outperforms the closed loop system for all delays. In the presence of gain and interference uncertainties, the transmitted power level of the open loop system is either loo high or too low of the nominal value. In graph 122 of Figure 6, a gain uncertainty of-2 dB was used. Figure 6 shows the BLER as a function of the delay. The initial reference SIRiARGin for each system was set to its corresponding nominal value obtained from Figure 5, in order to achieve a BLER of 10"'. Figure 6 shows that, in the presence of gain uncertainty, both the combined and closed loop systems achieve the desired BLER. The performance of the weighted open loop system severely degrades. We Claim: 1. A user equipment (110, 112) for transmission power control, comprising: circuitry (94) configured to determine a pathloss associated with a received signal; circuitry (101, 103) configured to receive an adjustment signal and adjust a value in response to the received adjustment; circuitry (98) configured to determine a transmit power level based on multiplying the determined pathloss by a parameter (a) and adding the adjusted value to a result of the multiplying; wherein a value of the parameter is value in the range of 0 to 1; and circuitry (82) configured to transmit a signal at the determined transmit power level. 2. The user equipment as claimed in claim 1 wherein the pathloss is derived by measuring a received power level of the received signal. 3. The user equipment as claimed in claim 1 wherein the pathloss is derived by measuring a received power level of a downlink common channel. 4. The user equipment as claimed in claim 1 wherein the pathloss is derived by measuring a received power level of a common control physical channel (CCPCH). 5. The user equipment as claimed in claim 1 wherein the circuitry configured to determine the transmit power level is based on the multiplying the determined pathloss by the parameter and adding the adjusted value to the result of the multiplication and at least one other value received by the user equipment from a base station. 6. The user equipment as claimed in claim 1 wherein the adjustment signal is a power control adjustment signal. 7. The user equipment as claimed in claim 1 wherein the circuitry for transmitting the signal transmits the signal over at least one time slot of a radio frame divided into time slots. 8. The user equipment as claimed in claim 7 wherein the circuitry is configured to transmit a subsequent signal over at least one subsequent time slot and then transmit power level of the subsequent signal is determined by multiplying an updated determined pathloss by the parameter and adding an updated adjusted value to a result of the multiplication of the updated determined pathloss. 9. The user equipment as claimed in claim 1 wherein the circuitry is operatively coupled to the antenna to demodulate signals received by the antenna to produce a baseband signal. 10. The user equipment as claimed in claim 1 wherein the received signal and the transmitted signal are in a code division multiple access format. 11. A method for transmission power control in a user equipment, comprising: determining a pathloss estimate associated with a received signal by a user equipment (UE); receiving an adjustment and adjusting a value in response to the received adjustment by the UE; determining a transmit power level based on multiplying the determined pathloss by a parameter and adding the adjusted value to a result of the multiplying by the UE; wherein the value of parameter is in the range of 0 to 1; and transmitting a signal at the determined transmit power level by the UE. 12. The method as claimed in claim 11 wherein the pathloss is derived by measuring a received power level of the received signal. 13. The method as claimed in claim 11 wherein the pathloss is derived by measuring a received power level of a downlink common channel. 14. The method as claimed in claim 11 wherein the pathloss is derived by measuring a received power level of a common control physical channel (CCPCH). 15. The method as claimed in claim 11 wherein the determined transmit power level is based on the multiplying the determined pathloss by the parameter and adding the adjusted value to the result of the multiplication and at least one other value received by the user equipment from a base station. 16. The method as claimed in claim 11 wherein the adjustment signal is a power control adjustment signal. 17. The method as claimed in claim 11 wherein the transmitting of the signal is over at least one time slot of a radio frame divided into time slots. 18. The method as claimed in claim 17 wherein transmitting a subsequent signal over at least one subsequent time slot and a transmit power level of the subsequent signal is determined by multiplying an updated determined pathloss by the parameter and adding an updated adjusted value to a result of the multiplication of the updated determined pathloss. 19. The method as claimed in claim 11 wherein demodulating signals received by the antenna to produce a baseband signal. 20. The method as claimed in claim 11 wherein the received signal and the transmitted signal are in a code division multiple access format.

Documents:

2072-delnp-2006-Abstract-(07-09-2012).pdf

2072-delnp-2006-abstract.pdf

2072-delnp-2006-Assignment-(08-01-2013).pdf

2072-delnp-2006-assignment.pdf

2072-DELNP-2006-Claims-(07-06-2011).pdf

2072-delnp-2006-Claims-(07-09-2012).pdf

2072-delnp-2006-Claims-(30-08-2012).pdf

2072-delnp-2006-claims.pdf

2072-delnp-2006-Correpondence-Others-(26-04-2013).pdf

2072-DELNP-2006-Correspondence Others-(07-06-2011).pdf

2072-delnp-2006-Correspondence Others-(07-09-2012).pdf

2072-delnp-2006-Correspondence Others-(08-01-2013).pdf

2072-delnp-2006-Correspondence-Others-(30-08-2012).pdf

2072-DELNP-2006-Correspondence-Others-(30-12-2010).pdf

2072-delnp-2006-correspondence-others-1.pdf

2072-delnp-2006-correspondence-others.pdf

2072-delnp-2006-Description (Complete)-(07-09-2012).pdf

2072-delnp-2006-description (complete).pdf

2072-delnp-2006-drawings.pdf

2072-DELNP-2006-Form-1-(07-06-2011).pdf

2072-delnp-2006-Form-1-(07-09-2012).pdf

2072-delnp-2006-Form-1-(08-01-2013).pdf

2072-delnp-2006-Form-1-(26-04-2013).pdf

2072-delnp-2006-form-1.pdf

2072-delnp-2006-Form-13-(30-08-2012).pdf

2072-delnp-2006-form-13.pdf

2072-delnp-2006-form-18.pdf

2072-delnp-2006-Form-2-(07-09-2012).pdf

2072-delnp-2006-Form-2-(08-01-2013).pdf

2072-delnp-2006-Form-2-(26-04-2013).pdf

2072-delnp-2006-form-2.pdf

2072-DELNP-2006-Form-3-(30-12-2010).pdf

2072-delnp-2006-form-3.pdf

2072-delnp-2006-form-5.pdf

2072-delnp-2006-GPA-(07-09-2012).pdf

2072-delnp-2006-GPA-(08-01-2013).pdf

2072-delnp-2006-gpa.pdf