WO2008023959A1 - Method and apparatus for uplink power control in communication system - Google Patents
Method and apparatus for uplink power control in communication system Download PDFInfo
- Publication number
- WO2008023959A1 WO2008023959A1 PCT/KR2007/004083 KR2007004083W WO2008023959A1 WO 2008023959 A1 WO2008023959 A1 WO 2008023959A1 KR 2007004083 W KR2007004083 W KR 2007004083W WO 2008023959 A1 WO2008023959 A1 WO 2008023959A1
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- WO
- WIPO (PCT)
- Prior art keywords
- harq
- traffic
- power control
- subscriber station
- power
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/20—TPC being performed according to specific parameters using error rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
Definitions
- the power control IE is contained in an UP MAP message, so that the power control IE is identified only by a basic connection identifier (CID) contained in the UL MAP message.
- CID basic connection identifier
- the uplink power control for non-HARQ traffic is performed at a low target PER of less than 1% in order to ensure the reliability of the wireless uplink in the IEEE 802.16e communication system.
- a target-PER mismatch phenomenon between HARQ traffic and non-HARQ traffic occurs.
- the reliability of non-HARQ traffic cannot be guaranteed if a target PER suitable to HARQ traffic is applied, while a HARQ gain cannot be guaranteed if a target PER suitable to non-HARQ traffic is applied.
- FIG. 1 is a flowchart illustrating an uplink power control procedure according to a first embodiment of the present invention
- FIG. 3 is a flowchart illustrating a power control procedure according to a second embodiment of the present invention.
- a power control offset value according to the present invention is reflected in the uplink power control. That is, a base station performs an uplink power control by using a target PER greater than a target PER for non-HARQ traffic, so as to increase a HARQ gain. Thereafter, when transmitting HARQ traffic, the subscriber station determines transmission power in the same manner as the existing uplink power control scheme.
- the subscriber station when transmitting non-HARQ traffic, performs a control operation in such a manner as to amplify transmission power determined by the existing uplink power control scheme to as high as a non- HARQ power control offset value as shown in Table 2 with respect to the non- HARQ traffic to be transmitted.
- a time point at which the non-HARQ power control offset value is applied is as follows. From when a HARQ connection is opened, the base station changes an outer loop target PER, for example, from a non-HARQ target PER of less than 1% to a HARQ PER of 10 to 30%, with respect to HARQ traffic. Thereafter, the subscriber station transmits uplink non-HARQ traffic using transmission power to which the non-HARQ power control offset.
- the base station 102 calculates a power offset "C" of the subscriber station 104 with a non-HARQ target PER of less than 10% in step 136.
- the subscriber station 104 sets its own power control offset (Offset per SS) to zero in step 206, and receives a power control IE from the base station in step 208.
- the power control IE contains a power offset (Offset per SS new) for amplifying or attenuating the transmission power according to the channel states.
- the subscriber station 104 replaces the "Offset per SS," which has been set to zero, with the "Offset per SS new" received through the power control IE in step 210, and determines if a HARQ connection has been opened in step 212.
- the subscriber station 104 determines if there is a HARQ burst in step 214. When it is determined that there is a HARQ burst, the subscriber station 104 sets transmission power to a value obtained by adding the "Offset per SS new" received in step 210 to Equation (1) in step 220. When it is determined that there is no HARQ burst, the subscriber station 104 amplifies and sets transmission power to a value obtained by adding the E received in step 202 to a set transmission power value in step 218.
- the basic CID is defined as an identifier which reports power control feedback information for non-HARQ traffic
- the primary CID is defined as an identifier which reports power control feedback information for HARQ traffic.
- a subscriber station uses the CID field as power control feedback information to which the subscriber station makes reference upon unlink transmission of a burst of corresponding traffic.
- FIG. 3 is a flowchart illustrating a power control procedure according to the second embodiment of the present invention.
- step 312 a network entry process is performed between the base station 302 and the subscriber station 304.
- step 314 the subscriber station 304 transmits power for a non-HARQ uplink burst, which is calculated by Equation (1), to the base station 302, and then proceeds to step 316.
- the power for the non-HARQ uplink burst is the same as that obtained by the existing scheme.
- the base station 302 calculates a power offset "A" of the subscriber station 304 with a non-HARQ target PER of less than 1% in step 318.
- the power offset "A" is a value for amplifying or deceasing transmission power according to the channel states.
- the method for calculating the power offset "A" has no direct relation to the present invention, so a detailed description thereof will be omitted.
- step 320 the base station 302 transmits a power control IE to the subscriber station 304, and proceeds to step 322.
- the power control IE contains the calculated "A" and a basic CID representing target PER information for non-HARQ traffic.
- step 322 a HARQ connection between the base station 302 and the subscriber station 304 is opened. Then, since the subscriber station 304 does not receive power control information for a HARQ uplink burst, the subscriber station 304 transmits in step 324 the HARQ uplink burst to the base station 302 after setting transmission power for the HARQ uplink burst to the initial transmission power determined in step 310.
- the base station 302 calculates a power offset "B" of the subscriber station 304 with a HARQ target PER of less than 10% in step 328, and then transmits a power control IE containing the calculated power offset "B" to the subscriber station 304 in step 330.
- the method for calculating the power offset "B" also has no direct relation to the present invention, so a detailed description thereof will be omitted.
- the subscriber station 304 transmits a HARQ uplink burst to the base station 302 after determining power for the HARQ uplink burst.
- the power for the HARQ uplink burst is determined by taking into consideration the power control information "B" of the received primary CID. That is, the power for the HARQ uplink burst is calculated by Equation (3), which is obtained by adding the "B" to Equation (1).
- step 348 the subscriber station 304 transmits a non-HARQ uplink burst to the base station 302 after determining power for the non-HARQ uplink burst.
- the power for the non-HARQ burst is calculated by Equation 4, which is obtained by adding the "C,” contained in the basic CID received in step 338, to Equation (1).
- FIG. 4 is a flowchart illustrating the operation of a subscriber station which performs power control according to the second embodiment of the present invention.
- the subscriber station 304 When the subscriber station 304 receives a UCD message containing a target CINR in step 402, the subscriber station 304 sets initial transmission power based on Equation 1 in step 404.
- step 410 the subscriber station 304 determines whether the CID received through the power control IE corresponds to a basic CID or a primary CID. When it is determined that the received CID corresponds to a basic CID, the subscriber station 304 replaces the "Offset per SS" set to zero by the "Offset per SS nHARQ new" received through the power control IE in step 412, and proceeds to step 416.
- the subscriber station 304 replaces the "Offset per SS" set to zero by the "Offset per SS HARQ new" received through the power control IE in step 414, and proceeds to step 416.
- step 416 the subscriber station 304 determines if there is a HARQ burst. When it is determined that there is no HARQ burst, the subscriber station 304 sets transmission power to a value obtained by adding the "Offset per SS nHARQ new" set in step 412 to Equation (1).
- the subscriber station makes reference to a CID of a power control IE received from the base station, and performs separate power control for HARQ traffic and non-HARQ traffic while distinguishing between the HARQ traffic and non-HARQ traffic based on the CID.
- the present invention intends to solve a target-PER mismatch problem between the target PERs of HARQ traffic and non-HARQ traffic, which may occur upon uplink power control when the HARQ is applied.
- the subscriber station transmits uplink data with different levels of transmission power for the HARQ traffic and non-HARQ traffic.
- the present invention can increase a HARQ gain by applying a higher target PER to HARQ traffic, while increasing the reliability of wireless link by using a relatively higher level of transmission power for non-HARQ traffic as compared with that used for the HARQ traffic.
- the present invention since the power control for non-HARQ traffic is performed by using a fixed offset value, the present invention can be implemented without a large change to the existing 802.16e system, while minimizing increments of additional signaling overhead.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200780035368.XA CN101517934B (en) | 2006-08-24 | 2007-08-24 | For the method and apparatus of up-link power control in communication system |
JP2009525503A JP5366322B2 (en) | 2006-08-24 | 2007-08-24 | Method and apparatus for uplink power control in communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060080799A KR100876715B1 (en) | 2006-08-24 | 2006-08-24 | Reverse power control method and apparatus in communication system |
KR10-2006-0080799 | 2006-08-24 |
Publications (1)
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WO2008023959A1 true WO2008023959A1 (en) | 2008-02-28 |
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Family Applications (1)
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PCT/KR2007/004083 WO2008023959A1 (en) | 2006-08-24 | 2007-08-24 | Method and apparatus for uplink power control in communication system |
Country Status (6)
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US (3) | US8095165B2 (en) |
EP (1) | EP1892848B1 (en) |
JP (1) | JP5366322B2 (en) |
KR (1) | KR100876715B1 (en) |
CN (1) | CN101517934B (en) |
WO (1) | WO2008023959A1 (en) |
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- 2007-08-24 US US11/844,616 patent/US8095165B2/en active Active
- 2007-08-24 EP EP07016645.9A patent/EP1892848B1/en active Active
- 2007-08-24 JP JP2009525503A patent/JP5366322B2/en active Active
- 2007-08-24 CN CN200780035368.XA patent/CN101517934B/en active Active
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2011
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Also Published As
Publication number | Publication date |
---|---|
CN101517934A (en) | 2009-08-26 |
KR100876715B1 (en) | 2008-12-31 |
JP2010502094A (en) | 2010-01-21 |
US8509840B2 (en) | 2013-08-13 |
US20120076124A1 (en) | 2012-03-29 |
EP1892848A1 (en) | 2008-02-27 |
EP1892848B1 (en) | 2017-11-01 |
US20130301573A1 (en) | 2013-11-14 |
US8095165B2 (en) | 2012-01-10 |
KR20080018551A (en) | 2008-02-28 |
JP5366322B2 (en) | 2013-12-11 |
CN101517934B (en) | 2016-03-30 |
US20080051028A1 (en) | 2008-02-28 |
US9913222B2 (en) | 2018-03-06 |
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