CN100525142C - Method for optimizing power deviation between PRACH lead and message - Google Patents
Method for optimizing power deviation between PRACH lead and message Download PDFInfo
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- CN100525142C CN100525142C CNB200510035518XA CN200510035518A CN100525142C CN 100525142 C CN100525142 C CN 100525142C CN B200510035518X A CNB200510035518X A CN B200510035518XA CN 200510035518 A CN200510035518 A CN 200510035518A CN 100525142 C CN100525142 C CN 100525142C
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Abstract
一种优化物理随机接入信道前导与消息之间功率偏差的方法，包括设置接入捕获门限，周期内期望的接入用户及块误码率的目标值，选取一个功率偏差值初始值，设定功率偏差的一个步进单位，及计数比较值；周期统计接入信道成功接入的用户数及块误码率；如果周期内接入能量大于捕获门限的用户即成功接入的用户，其数目超过接入用户期望的目标值，但是块误码率相对已设定的期望目标值亦较高，则说明是功率偏差设置过小，这时，对这种判别结果进行计数，如果该计数达到所述计数比较值，则使功率偏差增加一个步进单位。在捕获门限设置合理的情况下，结合捕获性能和解调性能的统计结果可优化功率偏差的设置。
A method for optimizing the power deviation between the preamble and the message of the physical random access channel, including setting the access capture threshold, the expected access user and the target value of the block error rate in the period, selecting an initial value of the power deviation value, and setting A step unit of fixed power deviation, and counting comparison value; periodical statistics of the number of users successfully connected to the access channel and the block error rate; If the number exceeds the expected target value of the access user, but the block error rate is relatively high compared to the set expected target value, it means that the power deviation setting is too small. At this time, count the judgment results. If the count When the count comparison value is reached, the power deviation is increased by one step unit. When the capture threshold is set reasonably, the setting of power deviation can be optimized by combining the statistical results of capture performance and demodulation performance.
Description
Technical field
The present invention relates to a kind of mobile communication system, more particularly, relate to the access technology of the Random Access Channel in WCDMA (Wide CodeDivision Multiple Address, the Wideband Code Division Multiple Access (WCDMA)) communication system.
Background technology
In the WCDMA system, Physical Random Access Channel is mapped on the public uplink physical channel, the carrying Random Access Channel, and access way is to adopt to divide time slot ALOHA technology at random.Subscriber equipment can begin transmission at a predefined time offset, is expressed as access slot.Per two frames have 15 access slots, are spaced apart 5120 chips (chip).Timing information on the access slot and catch indication as shown in Figure 1.Fig. 1 has shown the quantity of access slot and the space between them.The information of which access slot can be used in the current area, is provided by high layer information.
The structure of access emission as shown in Figure 2 at random.Insert emission at random and comprise that one or more length are leading part and long message part that comprises data and control information for 10ms or 20ms of 4096 chips.Among Fig. 2, subscriber equipment at first calculates leading Initial Trans according to open loop power control, if can not receive the successful response of acquisition indicator, then subscriber equipment continues to send leading according to power ramp stepping and the leading Initial Trans of the soaring number of times adjustment of maximum power.If received the success response of acquisition indicator, then subscriber equipment is adjusted the transmitting power of message again according to leading last transmitting power and power deviation, and sequential relationship according to the rules sends information.The value of above-mentioned parameter is all determined when the WCDMA BTS channel is set up.
In fact the transmitting power of message is made up of two parts: control section power and data division power.Last message transmit power and power deviation have just been determined the transmitting power of control section
Cntl
dBm＝Pre
dBm+P
p-m。And the transmitting power of data division then depends on power factor c, the d of control section and data division.The gross power of message part is actual to be 10Log[10
(Data dbm/10+ (3))+ 10
(Cntl dBm/10+ (3))].C, d give subscriber equipment by broadcast channel, and for Physical Random Access Channel, its value is constant usually.Therefore, in fact we can say between power deviation and the message gross power and have fixed relationship.
Wherein, the soaring number of times equivalence of power ramp stepping and maximum power choose the direct acquisition performance that influences Physical Random Access Channel, and directly determined user's access acquisition probability, require usually to insert acquisition probability more than 99%, comparatively speaking, choose than being easier to by emulation, test.And power deviation will directly influence the demodulation performance of Physical Random Access Channel, and the requirement to demodulation performance when power deviation is big is also higher, in the communication protocol span of defined be-5db is to 10db.Therefore, during selection, in span, suitable little unsuitable big.If select hour, will cause the user can insert (by the acquisition probability decision), but demodulation result is always wrong, just bLock error rate very high (because the message part gross power is less than normal) causes subscriber equipment can not complete successfully whole access procedure.Therefore, need on the basis of balanced acquisition probability and bLock error rate, choose according to field testing usually.If but selection is too high, then not only makes user's installation cost electricity, simultaneously, also causes the uplink interference to other user easily.
Summary of the invention
The technical problem that the present invention will solve is, the method of power deviation between a kind of leading and message of optimizing Physical Random Access Channel is provided, it can guarantee to greatest extent the effectively access-in resource of using system, improves access efficiency, also can make the subscriber equipment power saving.
The technical scheme that the present invention addresses the above problem is, a kind of method of optimizing power deviation between PRACH lead and the message is provided, and this method may further comprise the steps:
(1) desired value of the access customer number that inserts detection threshold, interior expectation of cycle and the desired value of bLock error rate are set, and in the span of power deviation, choose a power offset value initial value, step units of setting power deviation and counting comparison value;
(2) in the physical layer of WCDMA base station, handle the module that inserts judgement and periodically add up the number of users that access channel successfully inserts, handle the module of access channel message decoding and periodically add up the bLock error rate of access channel message, and statistics is reported the software layer of WCDMA base station;
(3) the bLock error rate statistics that reports of the successful access customer number that periodically module that handle to insert judgement reported of the software layer of WCDMA base station and the module of handling access channel message decoding is differentiated: surpass access customer number order desired destination value if insert energy in the cycle greater than the number of users of detection threshold, and bLock error rate is also greater than the expectation target value of having set, this differentiation result is counted, when count value reaches described counting comparison value, make power deviation increase a step units.
The method of power deviation between the leading and message of optimization Physical Random Access Channel provided by the invention, be provided with under the rational situation at detection threshold, statistics in conjunction with acquisition performance and demodulation performance can be optimized power deviation, thereby, can guarantee the access-in resource of effective using system to greatest extent, improve access efficiency, also can make the subscriber equipment power saving, reduce its uplink transmission power, reduce its uplink interference, therefore can increase the soft capacity of system and catching and demodulation performance of system cut-in channel other user.
Description of drawings
Fig. 1 is the quantity of the access slot in the WCDMA system and the space schematic diagram between them;
Fig. 2 is the emitting structural of the access at random schematic diagram in the WCDMA system;
Fig. 3 is a kind of workflow diagram of optimizing the method for power deviation between PRACH lead and the message of the present invention.
Embodiment
The method of power deviation is applicable to the Physical Random Access Channel transfer of data of WCDMA system between the leading and message of optimization Physical Random Access Channel provided by the invention.
Please refer to Fig. 3, the method of power deviation at first will be according to system requirements between optimization PRACH lead provided by the invention and the message, the desired value that inserts detection threshold, access customer number and bLock error rate is set, and in the span of power deviation, choose the initial value of a power offset value, step units of setting power deviation and counting comparison value.Wherein, described access detection threshold can obtain by specifying false alarm rate (one thousandth) emulation; The desired value of the desired value of the access customer number of expectation and bLock error rate and counting comparison value obtain by the field testing checking in described access detection threshold, cycle, as in the applied in network performance test of WCDMA, promptly can obtain its reasonable parameter configuration scope in network in conjunction with test result.
The demodulation performance of Physical Random Access Channel depends primarily on power offset value, requirement to demodulation performance when power deviation is big is also higher, since the span of power deviation (in the agreement span of defined be-5db is to 10db, be not limited only to this scope) in, be suitable little unsuitable big in principle, so should choose a smaller value, therefore should in the span of power deviation, choose a smaller value as the power deviation initial value.Then, in the physical layer of WCDMA base station, add up the number of users that access channel successfully inserts by handling the module cycle of inserting judgement, and statistics is reported the software layer of WCDMA base station; Equally, in the physical layer of WCDMA base station, by the bLock error rate of the module cycle statistics access channel message of handling access channel message decoding, this cycle can be provided with according to different execution modes, but should be a minute level at least.And statistics is reported the software layer of WCDMA base station; The software layer cycle of WCDMA base station is differentiated the bLock error rate statistics that the successful access customer number that inserts judging module and report and access channel message decoding module report: if user's (promptly inserting the user of energy) that success inserts in the cycle greater than detection threshold outnumber the desired value that inserts the user, but target value set is very high for relative one of bLock error rate simultaneously, then to be that power deviation is provided with too small in explanation, will differentiate the result to this and count, add 1 as counter.
At last, need carry out the optimization step of last power deviation, to guarantee the reliability of system, the count value of differentiating the result is compared with the counting comparison value that sets, if count value is greater than the counting comparison value, then make power deviation increase a step units, this power deviation can be adjusted by the 0.5db stepping, also can adjust by other step value.Because in fact the access-in resource of WCDMA base station is always limited, therefore can guarantee the access-in resource of efficient using system to greatest extent by adjusting power deviation.The reduction of the uplink transmission power of subscriber equipment can reduce its uplink interference to other user, thereby also can increase the soft capacity of system and catching and demodulation performance of system cut-in channel.After the optimization of finishing power deviation between above-mentioned channel leading and the message, carry out again in the physical layer of WCDMA base station, handle the module that inserts judgement, the number of users that cycle statistics access channel successfully inserts, and statistics reported the software layer of WCDMA base station, to proceed follow-up monitoring and adjustment.In addition, by repeatedly adjusting power deviation after optimal value, with the preset parameter of this optimal value as system.
Being appreciated that the present invention also can adopt chooses bigger power offset value earlier, reduces to the execution mode of a desired value again.If after having chosen a power deviation, it causes uplink interference to other user, illustrates that then this power deviation is bigger, therefore it suitably need be reduced.When uplink interference reduces to some extent, and insert energy in the cycle and meet access customer number order desired destination value greater than the number of users of detection threshold, bLock error rate also meets the expectation target value of having set, illustrates that power deviation reaches to preferred values.
Claims (6)
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| CNB200510035518XA CN100525142C (en) | 2005-06-23 | 2005-06-23 | Method for optimizing power deviation between PRACH lead and message |
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| CNB200510035518XA CN100525142C (en) | 2005-06-23 | 2005-06-23 | Method for optimizing power deviation between PRACH lead and message |
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| CN1885743A CN1885743A (en) | 2006-12-27 |
| CN100525142C true CN100525142C (en) | 2009-08-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5268654B2 (en) * | 2007-01-19 | 2013-08-21 | 株式会社エヌ・ティ・ティ・ドコモ | Base station apparatus and communication control method |
| CN101137239B (en) * | 2007-09-28 | 2012-01-11 | 中兴通讯股份有限公司 | Random access parameter automatic optimization method |
| CN101730256B (en) * | 2008-10-14 | 2012-07-25 | 上海摩波彼克半导体有限公司 | Method for realizing rapid and random switching-in process in wireless honeycomb network |
| CN102624483B (en) * | 2012-03-02 | 2014-12-03 | 华为技术有限公司 | Method and device for data transmission |
| US10595280B2 (en) * | 2015-03-06 | 2020-03-17 | Qualcomm Incorporated | Repetition level coverage enhancement techniques for physical random access channel transmissions |
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2005
- 2005-06-23 CN CNB200510035518XA patent/CN100525142C/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| Random access channel (PACH) parameters optimizationinWCDMA systems. 2004 IEEE 60th Vehicular Technlology Conference，第6卷. 2005 * |
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| CN1885743A (en) | 2006-12-27 |
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