WO2004086650A1 - Procede de determination de la puissance de reference dans la technologie d'equilibre des puissances de liaisons descendantes en cas de transfert en douceur - Google Patents
Procede de determination de la puissance de reference dans la technologie d'equilibre des puissances de liaisons descendantes en cas de transfert en douceur Download PDFInfo
- Publication number
- WO2004086650A1 WO2004086650A1 PCT/CN2003/000226 CN0300226W WO2004086650A1 WO 2004086650 A1 WO2004086650 A1 WO 2004086650A1 CN 0300226 W CN0300226 W CN 0300226W WO 2004086650 A1 WO2004086650 A1 WO 2004086650A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- node
- downlink
- power
- soft handover
- participating
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/12—Access point controller devices
Definitions
- the present invention relates to a code division multiple access (CDMA) communication system.
- CDMA code division multiple access
- the present invention relates to a method and a system for determining a reference power in a downlink power balancing technology in a case of soft handover in a code division multiple access system. Background technique
- FIG. 1 shows a schematic diagram of downlink inner loop power control in the prior art.
- the inner-loop power control receiver measures the received signal to obtain an estimated signal-to-interference ratio (SIR), and then compares this estimate with the SIR target value obtained through the outer-loop power control to generate power for the transmit power of the transmitter.
- SIR signal-to-interference ratio
- the control command is transmitted to the transmitting end through the reverse channel, and the transmitting end increases or decreases the current transmission power according to a certain adjustment step according to the command. Therefore, inner loop power control is a feedback-type power control technology.
- the outer loop power control is responsible for generating the required target SIR for the inner loop power control. It adjusts the SIR target value to track changes in the wireless channel environment, thereby maintaining the quality of service (QoS) agreed upon by the system when the service is established.
- QoS quality of service
- the inner loop power control can be applied to both the uplink and the downlink.
- a 3rd Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (WCDMA) system is used as an example to describe the inner loop power control process of the downlink.
- 3GPP 3rd Generation Partnership Project
- WCDMA Wideband Code Division Multiple Access
- downlink closed-loop power control is mainly used in downlink Dedicated physical channel (DPCH).
- DPCH downlink Dedicated physical channel
- TPC transmit power control
- DPCCH uplink dedicated physical control channel
- the execution of the downlink inner loop power control command is usually completed by node B.
- the node B receives the uplink DPCCH channel from the UE and estimates a TPC command. Then, update the current transmit power P (k-l) according to the following formula:
- P TPC (k) P (kl) + P TPC (k) + P ba , (k) (1) where all parameters are expressed in decibels (dB), P TPC (k) is the inner loop generated according to the TPC command Power adjustment amount, if let ⁇ ! ⁇ is the adjustment step size of the inner loop power control.
- P TPC (k) is calculated as follows:
- Pbai (k) in equation (1) is the correction amount to prevent downlink power drift in the case of soft handover.
- the macro diversity technology in soft handover in a CDMA system and the downlink power drift in the case of soft handover are described below.
- FIG. 2 shows a schematic diagram of soft handover in a WCDMA system, where node B is controlled by a radio network controller (RNC), and the UE communicates with two node Bs at the same time.
- RNC radio network controller
- Receiving the uplink and downlink signals in soft handover can use the macro division unique to soft handover. Set technology, the resulting soft handover gain can improve the performance of CDMA network coverage and traffic.
- the UE may perform maximum ratio combining of downlink signals from different Node Bs.
- each Node B separately processes the same uplink signal received from the UE, and the data frame decoded by the channel is finally sent to the RNC to be further merged.
- a selective merge method is usually used. .
- each node B separately detects the TPC domain of the uplink DPCCH and applies it to the respective inner loop power control unit, and cannot be combined by the RNC. Otherwise, it will cause a large delay in the inner loop power control, which will greatly reduce the control rate and tracking performance of the inner loop power control. Therefore, the reception of downlink power control commands does not have the soft handover gain caused by macro diversity. In this way, although there is only one downlink power control command generated by the UE, since the uplink DPCCH channel carrying the command reaches different base stations, the signals have different SIRs, and because there is no soft handover gain to use, The reliability of the control bit TPC is not comparable to the reliability of the data bits.
- the downlink may have a downlink power drift because different base stations incorrectly decode the downlink power control command.
- the sum on the left in equation (3) represents the total power balance adjustment during an adjustment period
- P ref is the downlink reference power
- P init is the initial value of the downlink power at the beginning of the adjustment period
- r is between 0
- the convergence coefficient between and 1 is used to control the proportion of the total power adjustment during each adjustment period.
- the parameter adjustment period, P ref and r in equation (3) are transmitted to the Node B by the RNC through the signaling path NBAP (Node B Application Part) between the RNC and the Node B.
- the adjustment period and r are generally relatively fixed parameters based on actual experience
- Pref is calculated by the RNC based on the dedicated measurement results of the Node B.
- the dedicated measurement of Node B related to the Pref calculation mainly includes SIR and transmit code power.
- For the dedicated measurement of Node B please refer to 3GPP's TS25.433. TS25.215 and TS25.133 protocols.
- the patent application WO02 / 25836 "Downlink Power Control in a Cellular Telecommunication Network” gives a node B using parameters provided by the RNC to determine the correction amount of the power balance adjustment loop P bal ( k).
- the patent application WO01 / 71941 "Determining the Reference Power Level in a Diversity Handover Base Station” provides a calculation method for the downlink reference power Pref .
- the calculation method of the downlink reference power Pref proposed in the patent application WO01 / 71941 is summarized mainly by taking the downlink reference power as the average of the sum of the average transmit code powers of the base stations, or the leading base station (with the maximum uplink) The average transmitted code power of the base station receiving the signal SIR.
- patent applications WO01 / 47145 and US6104933 relate to a method for allocating downlink transmit power in the case of soft handover. They all propose that in the case of soft handover, the downlink transmit power optimization scheme of each base station should be inversely proportional to the downlink path loss, that is, under the condition that the mobile station reception rate is guaranteed, the downlink path loss is relatively Large base stations should allocate less power, while base stations with lower downlink path loss should allocate more power. In this way, the total downlink transmission power can be minimized, thereby reducing interference to other channels, and conducive to increasing channel capacity.
- the present invention proposes a method for determining a reference power in an effective downlink power balancing technology in a soft handover situation.
- the method for determining a downlink reference power in a soft handover situation includes: a first step, in which a radio network controller RNC obtains transmit code power from multiple Node Bs participating in a user equipment UE soft handover and obtains the power for reflecting A measurement parameter of the relative path loss magnitude; and a second step, in which the RNC uses the obtained result to determine the downlink reference power P allocated by the i-th Node B to the UE under the condition that the current total received power of the UE remains unchanged .
- the method of the present invention considers the current total received power value of the UE to be handed over, Determine the downlink reference power while keeping this value unchanged, so it will not affect
- the inner loop power control of the UE itself is balanced.
- an optimized downlink reference power allocation scheme is considered, so the downlink reference power ref m allocated by the i-th node B to the UE is determined by the following formula:
- m represents the number of nodes B participating in the soft handover, and represents the average downlink loss from the j-th node to the UE.
- parameters are introduced (representing the downlink power ratio of the i-th node B relative to the first node B allocated by RNC), so that each node B can allocate downlink reference power in different proportions.
- the value of all nodes B participating in the soft handover is 1, the traditional equal power allocation method is still adopted. If different values are set for different Node Bs, then an optimized downlink reference power allocation scheme can be implemented by.
- the downlink reference power V ′ ref allocated by the i-th node to the UE is determined by the following formula.
- the measurement value of the Node B is preferably used instead of the measurement value of the UE!
- the reason is that the measurement report of the Node B does not occupy radio channel resources compared with the measurement measurement of the UE, and avoids the measurement values of the UE and the Node B in time. It is more difficult to maintain consistency.
- the present invention also provides a device for determining a downlink reference power in a soft handover situation, including: obtaining means for obtaining a first step of transmitting code power from multiple Node Bs participating in a user equipment UE soft handover and obtaining Used to reflect relative A measurement parameter of the path loss magnitude; and a determining device, configured to determine, according to a result obtained by the obtaining device, the downlink reference power P allocated by the Node B to the UE under the condition that the current total received power of the UE remains unchanged.
- FIG. 1 is a schematic diagram of downlink inner loop power control in the prior art
- FIG. 2 is a schematic diagram of a soft handover process
- Figure 3 is a block diagram of a method according to the present invention.
- Figure 4 is a block diagram of a system according to the present invention.
- Fig. 5 is a detailed representation of the method shown in Fig. 3. detailed description
- Fig. 3 is a block diagram of a method according to the present invention.
- the downlink reference power Pref is determined by the RNC based on the dedicated measurement results of the Node B.
- the RNC may require each Node B participating in the soft handover to report its respective transmit code power.
- the RNC can control the Node B to perform a predetermined smoothing filtering process before the measurement report, or to further average the measurement report results in the RNC.
- the power value thus obtained can be used as the current downlink transmission code of the Node B. Estimated power.
- the RNC also needs to obtain measurement parameters that reflect the relative magnitude of the downlink path loss. It should be understood by those skilled in the art that these measurement parameters may be various and may be obtained in various ways, for example, may be obtained through direct measurement, or may be obtained through conversion with other values.
- the measurement parameter may include (but is not limited to) the received signal code power of the common pilot channel CPICH measured by the UE / WCP OTCW ,,,
- step 304 the RNC determines the downlink reference power allocated by each Node B under the condition that the current total received power of the UE remains unchanged, so as to obtain the power balance adjustment amount subsequently.
- FIG. 4 illustrates a block diagram of a device according to the invention in detail.
- the RNC includes an acquiring device for acquiring the transmission code power reported by each Node B and acquiring the foregoing measurement parameter reflecting the relative magnitude of the downlink path loss, and further including a determining device for maintaining the total current power received by the UE.
- the downlink reference power allocated by each Node B to the UE is determined under constant conditions for subsequent power balance adjustment loops. It should be understood that the wiring shown in FIG. 4 only represents a logical connection.
- m Node Bs are in a soft handoff connection state with the UE, and the estimated value of the current downlink transmit code power of each Node B can be expressed as the average downlink path loss from each Node B to the UE is Li, then The total power P currently received by the UE is: '
- the result of the downlink power balance adjustment loop is to make the average value of the downlink power of each node B tend to the downlink reference power. Therefore, the downlink power of each node B when the downlink power balance adjustment loop converges That is, the downlink reference transmit power P of each Node B set by the RNC should satisfy the following equation:
- Equation (5a) shows that after the downlink power balance adjustment, the total power received by the UE should remain unchanged, so that the downlink power balance adjustment loop does not affect the inner loop power control.
- Equation (5b) ⁇ ,. is the ratio of the downlink reference power of the i-th node B allocated to RNC to the downlink reference power of a first node B.
- the first node B may be determined as any node B participating in the soft handover process. It is noted that there is no restriction on the downlink power allocation method in soft handover.
- the downlink reference transmit power of each node B can be obtained from the above formula:
- the downlink reference transmit power of each node B is:
- the downlink reference transmit power of each Node B is:
- the average downlink path loss from the i-th Node B to the UE is unknown It can usually be obtained by the following two methods.
- One method is to calculate
- each node B common pilot channel CPICH, RSCP OTOT is the corresponding CPICH received signal code power measured by the UE.
- the calculation formula can be either done by the UE, then the UE obtains the known P C T P X 1CH J may be calculated by the RNC from the cell broadcast, then UE reports directly RSCP o / ,, measurements, and / ⁇ Is the known quantity of RNC.
- the ratio of the average uplink path loss is the ratio of the uplink received code power of each node B.
- the uplink received code power is not the Node B measurement specified in the standard, if the difference in the uplink interference between nodes B is ignored, the ratio of the average uplink path loss can be approximated by the ratio of the uplink received signal SIR.
- the average path loss of the uplink and downlink wireless links is approximately equal because the carrier frequencies are close and they have experienced the same spatial propagation path. Therefore, the ratio of the average downlink path loss can be expressed as:
- the downlink reference transmit power of each node B shown in equation (8) can be calculated by the following formula : If it is allocated according to normal power, then the downlink reference transmit power of each node B shown in equation (9): FIG.
- the RNC obtains parameters required to determine the downlink reference power of each Node B.
- the RNC may use NBAP's dedicated measurement signaling to instruct each Node B participating in the UE soft handover to measure and report the received signal SIR and transmission in a certain manner (for example, typically repeated at a certain period) Code power.
- the RNC may only obtain the transmission code power from each Node B, and at the same time obtain the CPICH received signal code power / WCP OTCT from the UE, or the downlink path loss.
- step 504 the RNC decides whether to use a conventional equal power allocation scheme or an optimized power allocation scheme. If the decision in step 504 is "yes”, the process proceeds to step 506, and the downlink reference power of each node B is determined according to the aforementioned formula (9) or (14). If the decision in step 504 is "No”, the process proceeds to step 508, and the downlink reference power of each node B is determined according to the aforementioned formula (8) or (13).
- step 510 the RNC sends the downlink power including the downlink reference power of each node B through the downlink power control command of the NBAP.
- Each parameter of the balance adjustment loop is sent to each Node B participating in the UE soft handover, and each Node B performs the downlink power according to the adopted downlink power balance adjustment loop algorithm according to formula (1) control.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2003/000226 WO2004086650A1 (fr) | 2003-03-28 | 2003-03-28 | Procede de determination de la puissance de reference dans la technologie d'equilibre des puissances de liaisons descendantes en cas de transfert en douceur |
AU2003221237A AU2003221237A1 (en) | 2003-03-28 | 2003-03-28 | A method for determining reference power in the downlink power balance technology in the case of soft hand-off |
CNB038262010A CN100372258C (zh) | 2003-03-28 | 2003-03-28 | 软切换情况下下行功率平衡技术中参考功率的确定方法 |
Applications Claiming Priority (1)
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PCT/CN2003/000226 WO2004086650A1 (fr) | 2003-03-28 | 2003-03-28 | Procede de determination de la puissance de reference dans la technologie d'equilibre des puissances de liaisons descendantes en cas de transfert en douceur |
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WO2004086650A1 true WO2004086650A1 (fr) | 2004-10-07 |
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PCT/CN2003/000226 WO2004086650A1 (fr) | 2003-03-28 | 2003-03-28 | Procede de determination de la puissance de reference dans la technologie d'equilibre des puissances de liaisons descendantes en cas de transfert en douceur |
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CN (1) | CN100372258C (zh) |
AU (1) | AU2003221237A1 (zh) |
WO (1) | WO2004086650A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100426696C (zh) * | 2005-01-30 | 2008-10-15 | 中兴通讯股份有限公司 | 一种宏分集状态下的下行链路功率平衡方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5586170A (en) * | 1994-08-19 | 1996-12-17 | Georgia Tech Research Corporation | Cellular devices, systems and methods using intercell macro-diversity and dynamic channel allocation |
WO1998059433A2 (en) * | 1997-06-23 | 1998-12-30 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for downlink power control in macro diversity radio systems |
US5926747A (en) * | 1996-09-05 | 1999-07-20 | Airnet Communications Corp. | Method and apparatus for dynamically optimizing the forward-link transmit power of a broadband multi-carrier radio signal |
EP0940930A2 (en) * | 1998-03-03 | 1999-09-08 | Nec Corporation | Method of controlling transmission power in a cellular type mobile communication system |
WO1999052310A2 (en) * | 1998-04-03 | 1999-10-14 | Nokia Networks Oy | Method and apparatus for power control in a mobile telecommunication system |
WO2001071941A2 (en) * | 2000-03-21 | 2001-09-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover reference power level for base stations |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3352593B2 (ja) * | 1996-05-22 | 2002-12-03 | 株式会社エヌ・ティ・ティ・ドコモ | 移動通信システムおよび移動通信システムにおけるソフトハンドオーバ中送信電力制御方法 |
US6351650B1 (en) * | 1999-01-28 | 2002-02-26 | Qualcomm Incorporated | System and method for forward link power balancing in a wireless communication system |
US6553016B1 (en) * | 1999-12-20 | 2003-04-22 | Telfonaktiebolaget Lm Ericsson (Publ) | Downlink power control at soft handover |
US6823193B1 (en) * | 2000-02-28 | 2004-11-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink transmit power synchronization during diversity communication with a mobile station |
-
2003
- 2003-03-28 CN CNB038262010A patent/CN100372258C/zh not_active Expired - Fee Related
- 2003-03-28 WO PCT/CN2003/000226 patent/WO2004086650A1/zh not_active Application Discontinuation
- 2003-03-28 AU AU2003221237A patent/AU2003221237A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5586170A (en) * | 1994-08-19 | 1996-12-17 | Georgia Tech Research Corporation | Cellular devices, systems and methods using intercell macro-diversity and dynamic channel allocation |
US5926747A (en) * | 1996-09-05 | 1999-07-20 | Airnet Communications Corp. | Method and apparatus for dynamically optimizing the forward-link transmit power of a broadband multi-carrier radio signal |
WO1998059433A2 (en) * | 1997-06-23 | 1998-12-30 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for downlink power control in macro diversity radio systems |
EP0940930A2 (en) * | 1998-03-03 | 1999-09-08 | Nec Corporation | Method of controlling transmission power in a cellular type mobile communication system |
WO1999052310A2 (en) * | 1998-04-03 | 1999-10-14 | Nokia Networks Oy | Method and apparatus for power control in a mobile telecommunication system |
WO2001071941A2 (en) * | 2000-03-21 | 2001-09-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover reference power level for base stations |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100426696C (zh) * | 2005-01-30 | 2008-10-15 | 中兴通讯股份有限公司 | 一种宏分集状态下的下行链路功率平衡方法 |
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Publication number | Publication date |
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CN1759544A (zh) | 2006-04-12 |
AU2003221237A1 (en) | 2004-10-18 |
CN100372258C (zh) | 2008-02-27 |
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