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Initial Power Setting of Additional Reverse Carriers

Lu, Jianmin lujianmin@huawei.com +1-469-222-3660

Kim T. Chang kchang@futurewei.com +1-469-229-5395

3GPP2 TSG-C

Aug, 2005

Huawei Technologies Co., Ltd. grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. Huawei Technologies Co., Ltd. is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution.

This document has been prepared by Huawei Technologies Co., Ltd. to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Huawei Technologies Co., Ltd. Huawei Technologies Co., Ltd. specifically reserves the right to amend or modify the material contained herein and to any intellectual property of Huawei Technologies Co., Ltd. other than provided in the copyright statement above.

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Notation & Abbreviation

• FLn and RLn are paired channels

• OpenLoopAdjust_FLn and ProbeInitialAdjust_FLn are fields in the AccessParameters message of FLn

• Pilot_Power_FLn is the pilot power of FLn measured by AT

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Problem

• In a multi-carrier DO system, when additional a reverse carrier (e.g. RL3) is assigned, how is the traffic channel initial power of this new carrier determined without access probe power as a reference?

FL1 FL2 RL1 RL2

Single Band Scenario

FL3 RL3

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Our Consideration(1/3)

• The open loop power control of the new reverse carrier may be conducted through:

1. The correlation between the new reverse carrier and the allocated reverse carrier, such as RL3 and RL2

FL1 FL2 RL1 RL2

Single Band Scenario

FL3 RL3

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Our Consideration(2/3)

2. The correlation between the new reverse carrier and its paired forward carrier (just like the OLPC of the Access Channel), such as RL3 and FL3

FL1 FL2 RL1 RL2

Single Band Scenario

FL3 RL3

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Our consideration(3/3)

3. The correlation between the correlation of paired FL/RLs, such as the correlation between correlation of RL3/FL3 and correlation of RL2/FL2.

FL1 FL2 RL1 RL2

Single Band Scenario

FL3 RL3

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Our Proposal: Single Band Scenario(1/2)• If there is already allocated reverse carrier(s) in the

same band as the new reverse carrier, just set the initial power of the new carrier as – the power of the nearest carrier, or– the average of them

• Because we believe in this case the frequency correlation between the reverse carriers are the key factor in OLPC

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Our Proposal: Single Band Scenario(2/2)

• For example, in the picture below, RL3 will be assigned in the same band as RL1 and RL2, then set– pilot_power_RL3 = pilot_power_RL2, or– pilot_power_RL3 = (pilot_power_RL1+

pilot_power_RL1)/2

FL1 FL2 RL1 RL2

Single Band Scenario

FL3 RL3

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Our Proposal: Cross-Band Scenario(1/5)

• If the new reverse carrier is in the band without another allocated reverse carrier, we propose two options:

• For example, RL4 will be assigned in Band C, while RL1 is already in Band A and RL2&3 are in Band B

Crossing Band scenario

Band A Band CBand B

FL1 FL2 FL3RL1 RL2 RL3 FL4 RL4

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Our Proposal: Cross-Band Scenario(2/5)

• Option1: Set the initial pilot power of RL4 as :

InitialPilotPower_RL4 ＝ - Pilot_Power_FL4 + OpenLoopAdjust_FL4

+ ProbeInitialAdjust_FL4

+ TrafficToAccessRatio

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Our Proposal: Cross-Band Scenario(3/5)

• TrafficToAccessRatio is a new parameter introduced to adjust the power ratio of traffic channel OLPC to access channel OLPC, and could be added into the reserved field of AccessParameters message

• Here, OLPC of new reverse carrier is estimated only from the correlation between the paired FL/RLs, just like access channel

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Our Proposal: Cross-Band Scenario(4/5)

• Option 2: From each pair of allocated FL/RL carriers, calculate the reference power for a new RL carrier (e.g. RL4):

Ref_n = PilotPower_RLn

＋ Pilot_Power_FLn

－ OpenLoopAdjust_FLn

－ ProbeInitialAdjust_FLn

－（ Pilot_Power_FL4

－ OpenLoopAdjust_FL4

－ ProbeInitialAdjust_FL4 ）

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Our Proposal: Cross-Band Scenario(5/5)• From these references, we can set the actual

initial pilot power for the new reverse carrier:– Choosing the nearest, say,

InitialPilotPower_RL4 = Ref_3– Choosing the average of nearest band, say,

InitialPilotPower_RL4 = (Ref_2+Ref_3)/2– Choosing the average, say,

InitialPilotPower_RL4 = (Ref_1+ Ref_1+ Ref_1)/3

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Summary

• Single band scenario, set new RL initial pilot power as– The pilot power of the nearest RL carrier– Or the average pilot powers of all the RL

carriers in the same band

• Cross-band scenario, set new RL initial pilot power as– Like OLPC of the access channel with some

adjustment– Or calculated through the reference by

other RL/FL couples using the formula in last slides