CN1185887C - Open-loop power control method in switching process between frequencies - Google Patents
Open-loop power control method in switching process between frequencies Download PDFInfo
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- CN1185887C CN1185887C CN 01144932 CN01144932A CN1185887C CN 1185887 C CN1185887 C CN 1185887C CN 01144932 CN01144932 CN 01144932 CN 01144932 A CN01144932 A CN 01144932A CN 1185887 C CN1185887 C CN 1185887C
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Abstract
The present invention discloses an open loop power control method in the process of frequency switchover. The method uses a compression mode to form gaps in the process of the frequency switchover, access prefixes are transmitted in the gaps, and corresponding acquisition indication information is detected; power indication information is provided to detect ascending transmitting power through the channel coding information of an acquisition indication channel (AICH), and descending initial transmitting power is determined through a descending detection method, so the optimal ascending and descending initial transmitting power of a dedicated physical channel (DPCH) after the switchover is determined. The method can be used to improve the power control performance during the frequency switchover, the success ratio of the switchover can be improved, and the call failure ratio is reduced.
Description
Technical field
The present invention relates to the Poewr control method in the mobile communication system switching process between frequencies.
Background technology
In switching process between frequencies, after subscriber equipment (UE) receives the switching command that network sends, getting in touch of the cut-out of the moment of appointment and original sub-district, and switch on the new frequency with Target cell under the base station set up and get in touch, target BS is set the Initial Trans of downward special physical channel (DPCH) and is sent descending DPCH according to open loop power, when UE finish descending DPCH synchronously after, serve capable DPCH according to the Initial Trans of the up DPCH of open Loop Power control process setting is concurrent, target BS is the up DPCH signal of search on new frequency, up to setting up uplink synchronous.Because the Initial Trans of UE and target BS is all set according to open Loop Power control, in some cases, cause the up DPCH power and the target power deviation that issue DPCH power and receive of target BS very big, this coarse initial power can cause other UE performance decrease in the target BS.
Summary of the invention
The objective of the invention is to a kind of open-loop power control method that can improve power control performance in the switching process between frequencies, use this method can improve handover success rate between frequency.
For achieving the above object, the open-loop power control method in the switching process between frequencies provided by the invention comprises:
(1) subscriber equipment (UE) monitors original cell signal quality when being lower than the predefine thresholding, and measurement result is reported network, and compact model (CM) parameter of network based configuration UE as a result that reports and target BS side also starts compact model;
(2) UE adopts signature A (Signature A) with initial uplink transmitting power emission Access Preamble (Access Preamble) at compression clearance;
(3) target BS detects described prefix, if do not detect, be left intact, otherwise, send access according to down initial transmitting power and allow to catch indication AI (AI-ACK);
(4) UE detects described AI (AI-ACK), if do not detect, at next compression clearance, adopt signature A and transmitting power to increase a magnitude emission Access Preamble, if the Access Preamble number of times of emission signature A surpasses the predefine thresholding, then report mistake, and withdraw from the open Loop Power control process to high level, if the Access Preamble number of times of emission signature A changes step (3) less than the predefine thresholding; If UE detects described AI (AI-ACK), then,
(5) UE is at next compression clearance, the power indication information that indication provides according to AI (AI-ACK) increases a magnitude with transmitting power, adopt signature B emission Access Preamble, if the Access Preamble number of times of emission signature B surpasses the predefine thresholding, then report mistake, and withdraw from the open Loop Power control process, if the Access Preamble number of times of emission signature B is less than the predefine thresholding to high level, then
(6) target BS detects described prefix, and transmitting power is reduced by a magnitude emission AI (AI-ACK);
(7) UE detects described AI (AI-ACK), if detect, changes step (5), otherwise,
(8) UE adopts signature A, and transmitting power is increased a magnitude emission Access Preamble, if the Access Preamble number of times of emission signature A surpasses the predefine thresholding, then report mistake, and withdraw from the open Loop Power control process, if the Access Preamble number of times of emission signature A is less than the predefine thresholding to high level, then
(9) target BS detects the prefix of signature A, launches after the magnitude of transmitting power increase with AI (AI-ACK);
(10) UE detects described AI (AI-ACK), if do not detect, changes step (8), otherwise UE increases a magnitude with transmitting power, adopts signature B emission Access Preamble;
(11) target BS detects the prefix of described signature B, determines best descending open loop Initial Trans, launches after the magnitude of transmitting power increase with AI (AI-NAK), and notice UE finishes descending detection process, withdraws from the open Loop Power control process then.
(12) UE detects described AI, if detect AI-NAK, determine best up open loop Initial Trans, and withdraw from the open Loop Power control process, otherwise UE will report mistake to high level, and withdraw from the open Loop Power control process.
Describedly catch indication (AI) and comprise whether access allows information (comprising AI-ACK: insert and allow AI-NAK: forbid inserting) and power indication information.
Descending open loop Initial Trans of described definite the best and best up open loop Initial Trans are as descending open loop Initial Trans of the best and best up open loop Initial Trans with last AI (AI-ACK) transmitting power and Access Preamble transmitting power.
The magnitude optimum value that described transmitting power increases and the magnitude optimum value of minimizing by experiment or emulation determine.
Because the gap that the present invention utilizes compact model to form in switching process between frequencies, in the gap, send Access Preamble and catch indication information accordingly with detecting, determine up Initial Trans by the power indication information that AICH Acquisition Indication Channel (AICH) chnnel coding information provides, determine down initial transmitting power by descending detection method, thereby the best up-downgoing Initial Trans of the DPCH (DPCH) after determining to switch, open Loop Power control performance when switching between improving frequently, improve handover success rate, reduce cutting off rate.
Description of drawings
Fig. 1 is the embodiment flow chart of the inventive method;
Fig. 2 is the AICH Acquisition Indication Channel frame assumption diagram;
Fig. 3 uses the schematic diagram that the present invention carries out open Loop Power control in the switching process between frequencies.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Use the present invention in the switching process between frequencies of mobile communication system, the power indication information that need provide by the chnnel coding of AICH Acquisition Indication Channel (AICH) carries out the control of open loop power.Fig. 2 is the AICH Acquisition Indication Channel frame assumption diagram.Shown in the figure, each AICH frame comprises 15 time slots, and each time slot has 32 real number symbols to be used to provide chnnel coding information.Wherein:
AI
1And AI
2Value get 1,0 ,-1 (" 1 " expression inserts and allows, and " 0 " expression does not send AI, and " 1 " expression is forbidden inserting) according to the result that catches, Ps (k) represents prefix signature sequence number, its value is with reference to following table:
| The prefix signature | The |
|||||||||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
| P 0(n) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| P 1(n) | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 |
| P 2(n) | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 |
| P 3(n) | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 |
| P 4(n) | 1 | 1 | 1 | 1 | -1 | -1 | -1 | -1 | 1 | 1 | 1 | 1 | -1 | -1 | -1 | -1 |
| P 5(n) | 1 | -1 | 1 | -1 | -1 | 1 | -1 | 1 | 1 | -1 | 1 | -1 | -1 | 1 | -1 | 1 |
| P 6(n) | 1 | 1 | -1 | -1 | -1 | -1 | 1 | 1 | 1 | 1 | -1 | -1 | -1 | -1 | 1 | 1 |
| P 7(n) | 1 | -1 | -1 | 1 | -1 | 1 | 1 | -1 | 1 | -1 | -1 | 1 | -1 | 1 | 1 | -1 |
| P 8(n) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 |
| P 9(n) | 1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 |
| P 10(n) | 1 | 1 | -1 | -1 | 1 | 1 | -1 | -1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 |
| P 11(n) | 1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 |
| P 12(n) | 1 | 1 | 1 | 1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | 1 | 1 | 1 | 1 |
| P 13(n) | 1 | -1 | 1 | -1 | -1 | 1 | -1 | 1 | -1 | 1 | -1 | 1 | 1 | -1 | 1 | -1 |
| P 14(n) | 1 | 1 | -1 | -1 | -1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | 1 | 1 | -1 | -1 |
| P 15(n) | 1 | -1 | -1 | 1 | -1 | 1 | 1 | -1 | -1 | 1 | 1 | -1 | 1 | -1 | -1 | 1 |
Like this, the AI value just can be by (AI
1, AI
2) form, have 9 kinds of combinations: (0,0), (0,1), (0 ,-1), (1,0), (1,1), (1 ,-1), (1,0), (1,1), (1 ,-1).So just can transmit abundant catch indication information in, be used for more accurate power controls or other purposes.UE can carry out access control and adjust uplink transmission power more accurately according to the AI indication that receives.
In above-mentioned 9, make up, can be used for the present invention by the indication information table of setting every kind of combination and correspondence thereof and carry out power control.
Fig. 1 is the embodiment flow chart of the inventive method, and application drawing 1 described embodiment carries out the schematic diagram of open Loop Power control with reference to figure 3 in switching process between frequencies.Essence of the present invention described in the figure, be on compact model (CM) gap, to send out Access Preamble (Access Preamble), the power indication information that utilizes the AICH chnnel coding to provide is adjusted up open loop transmit power, utilize the descending detection process of Access Preamble and AICH, optimize the initial power of descending DPCH channel and set.
According to Fig. 1, in step 1, UE monitors original cell signal quality when being lower than the predefine thresholding, measurement result is reported network, the compressed-mode parameter of network based configuration UE as a result that reports and target BS side also starts compact model, and UE starts compact model according to the network side signaling and carries out inter-frequency measurement, after measurement is finished, the open Loop Power control optimizing process that UE switches between continuing to be undertaken frequently by compressed mode gap is with reference to figure 3.Suppose that former cell frequency is f
1, the Target cell frequency is f
2, UE prepares to switch to Target cell from former sub-district.During the normal mode, UE is in frequency f
1Go up with former base station and keep being connected.Then carry out step 2, at compression clearance A, UE is in frequency f
2On, adopt signature A to send prefix, and the AI that the detection target BS sends in this gap catch indication information with the initial uplink transmitting power.Carry out step 3, target BS detects the prefix of up transmission during this period, if the prefix of detecting then sends to catch and indicates AI (to contain access among the AI and whether allow information, for example, AI-ACK allows for inserting, and AI-NAK inserts for forbidding, also comprises the power indication information among the AI certainly); If the prefix of not detecting then is left intact.In step 4, it is described AI (AI-ACK) that UE detects, if do not detect AI (AI-ACK), means the uplink transmission power deficiency, then in next compression clearance B, continues in frequency f
2On, adopt signature A to send prefix (, then report mistake, and withdraw from the open Loop Power control process) to high level if the number of times of the prefix of emission signature A surpasses the predefine thresholding, transmitted power increases △ P1, and continues to detect AI (AI-ACK) indication of whether receiving that target BS issues; In compression clearance B, if target BS detects the prefix of up transmission, then send and catch indication AI (AI-ACK) according to down initial transmitting power, if UE detects AI (AI-ACK) indication in the crack during this time, then carry out step 5, in compression clearance C, the UE power indication information that indication provides according to previous AI (AI-ACK) is adjusted the transmitting power of up prefix, be that transmitting power increases △ P21, and the signature of up prefix is replaced by B.In step 6, target BS sends behind the power decreasing △ P4 with AI (AI-ACK) indication after detecting up prefix.In step 7, UE detects AI (AI-ACK) indication in the crack during this time, if detect, at compression clearance D, the UE power indication information that indication provides according to previous AI (AI-ACK) is adjusted the transmitting power of up prefix, be that transmitting power increases △ P22, adopt the up transmission prefix of signature B (if the number of times of the prefix of emission signature B surpasses the predefine thresholding, then report mistake to high level, and withdraw from the open Loop Power control process), target BS sends behind the power decreasing △ P4 with AI (AI-ACK) indication after detecting up prefix; If UE does not receive AI (AI-ACK) indication in the crack during this time, then carry out step 8, in compression clearance E, UE adopts the up transmission prefix of signature A, and its power increases △ P31.In step 9, target BS is detecting signature for after the prefix of A, determines that AI (AI-ACK) indication that previous gap issues is not detected by UE, sends behind the transmitted power increase △ P5 with AI (AI-ACK).In step 10, UE during this time in the crack detection whether receive AI (AI-ACK) indication, if do not detect, then in compression clearance F, UE adopts the up transmission prefix of signature A (if the number of times of the prefix of emission signature A surpasses the predefine thresholding, then report mistake to high level, and withdraw from the open Loop Power control process), its power increases △ P32, target BS is detecting signature for after the prefix of A, determine that AI (AI-ACK) indication that previous gap issues is not detected by UE, send behind the transmitted power increase △ P5 with AI (AI-ACK); If UE receives AI (AI-ACK) indication in the crack during this time, then in compression clearance G, UE adopts the up transmission prefix of signature B, and its power increases △ P33.In step 11, target BS is detecting signature for after the prefix of B, determine that AI (AI-ACK) indication that previous gap issues is detected by UE, determine that AI (AI-ACK) transmitted power in the F of gap is best descending open loop Initial Trans, and send behind the transmitted power increase △ P5 with AI (AI-NAK), withdraw from the open Loop Power control process then, UE receives AI (AI-NAK) indication in the crack during this time, determine that the open Loop Power control optimizing process finishes, that is to say, before said process finishes, determine best descending open loop Initial Trans and best up open loop Initial Trans, determine that promptly G uplink transmission power constantly is best up open loop power, F down transmitting power constantly is best descending open loop power, with the Initial Trans of the best open loop power of this up-downgoing as the up-downgoing DPCH after switching between frequency.
Above the magnitude optimum value of the magnitude optimum value that increases of described transmitting power and minimizing need by experiment or emulation is determined.
Claims (3)
1, the open-loop power control method in a kind of switching process between frequencies comprises:
(1) user equipment (UE) monitors original cell signal quality when being lower than the predefine thresholding, and measurement result is reported network, and the compact model CM parameter of network based equipment UE of configure user as a result that reports and target BS side also starts compact model;
(2) user equipment (UE) adopts signature A with initial uplink transmitting power emission Access Preamble at compression clearance;
(3) target BS detects described prefix, if do not detect, be left intact, otherwise, send access according to down initial transmitting power and allow to catch indication;
(4) user equipment (UE) detects described access and allows to catch indication, if do not detect, at next compression clearance, adopt signature A and transmitting power to increase a magnitude emission Access Preamble, if the Access Preamble number of times of emission signature A surpasses the predefine thresholding, then report mistake, and withdraw from the open Loop Power control process to high level, if the Access Preamble number of times of emission signature A changes step (3) less than the predefine thresholding; If user equipment (UE) detects described access and allows to catch indication, then,
(5) user equipment (UE) is at next compression clearance, allowing to catch indication according to access indicates the power indication information that provides that transmitting power is increased a magnitude, adopt signature B emission Access Preamble, if the Access Preamble number of times of emission signature B surpasses the predefine thresholding, then report mistake, and withdraw from the open Loop Power control process, if the Access Preamble number of times of emission signature B is less than the predefine thresholding to high level, then
(6) target BS detects described prefix, transmitting power is reduced by a magnitude emission access allow to catch indication;
(7) user equipment (UE) detects described access and allows to catch indication, if detect, changes step (5), otherwise,
(8) subscriber equipment U E adopts signature A, and with a magnitude emission of transmitting power increase Access Preamble, if the Access Preamble number of times of emission signature A surpasses the predefine thresholding, then report mistake to high level, and withdraw from the open Loop Power control process, if the Access Preamble number of times of emission signature A is less than the predefine thresholding, then
(9) target BS detects the prefix of signature A, launches after the transmitting power that access is allowed to catch indication increases a magnitude;
(10) user equipment (UE) detects described access and allows to catch indication, if do not detect, changes step (8), otherwise user equipment (UE) increases a magnitude with transmitting power, adopts signature B emission Access Preamble;
(11) target BS detects the prefix of described signature B, determine best descending open loop Initial Trans, to forbid inserting and launch after the transmitting power of catching indication increases a magnitude, notifying user equipment UE finishes descending detection process, withdraws from the open Loop Power control process then.
(12) the user equipment (UE) detection is described catches indication, forbids inserting if detect, and determine best up open loop Initial Trans, and withdraw from the open Loop Power control process, otherwise user equipment (UE) will report mistake to high level, and withdraw from the open Loop Power control process.
2, the open-loop power control method in the switching process between frequencies according to claim 1 is characterized in that: described catch the indication comprise whether access allows information and power indication information.
3, the open-loop power control method in the switching process between frequencies according to claim 1 is characterized in that: descending open loop Initial Trans of described definite the best and best up open loop Initial Trans are last access to be allowed to catch indicate transmitting power and Access Preamble transmitting power respectively as best descending open loop Initial Trans and best up open loop Initial Trans.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144932 CN1185887C (en) | 2001-12-24 | 2001-12-24 | Open-loop power control method in switching process between frequencies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144932 CN1185887C (en) | 2001-12-24 | 2001-12-24 | Open-loop power control method in switching process between frequencies |
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| CN1429032A CN1429032A (en) | 2003-07-09 |
| CN1185887C true CN1185887C (en) | 2005-01-19 |
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| CN 01144932 Expired - Fee Related CN1185887C (en) | 2001-12-24 | 2001-12-24 | Open-loop power control method in switching process between frequencies |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344093C (en) * | 2004-12-16 | 2007-10-17 | 华为技术有限公司 | Downlink compression mode scheduling method |
| CN101083491B (en) * | 2006-05-29 | 2010-09-29 | 中兴通讯股份有限公司 | Method for realizing power control of high speed sharing information channel |
| CN101325435B (en) * | 2007-06-11 | 2012-06-13 | 中兴通讯股份有限公司 | Control method for high speed sharing indication channel power |
| CN101383658B (en) * | 2008-09-24 | 2012-12-05 | 中兴通讯股份有限公司 | Processing method for downlink physical channel compression schema |
| US20160007370A1 (en) * | 2014-07-01 | 2016-01-07 | Qualcomm Incorporated | Smart Power Monitor Scheduling to Improve Throughput Performance in a MSMA Phone |
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