CN1592172A - Forward power controlling method for CDMA clustered communication system - Google Patents
Forward power controlling method for CDMA clustered communication system Download PDFInfo
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- CN1592172A CN1592172A CN 03155269 CN03155269A CN1592172A CN 1592172 A CN1592172 A CN 1592172A CN 03155269 CN03155269 CN 03155269 CN 03155269 A CN03155269 A CN 03155269A CN 1592172 A CN1592172 A CN 1592172A
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Abstract
This invention discloses a forward power control method in a CDMA cluster communication system including: determining the basic emit power of the base station, after setting up a forward shared channel at the cluster terminal, the current cluster set forward shared channel emit power value is regulated on the basis of ensuring the correct receiving by all clusters in the current cluster set form the basic emit power; which solves the problem of forward power control with one forward shared channel facing to multiple cluster terminals when increasing cluster functions in the CDMA system.
Description
Technical field
The present invention relates to trunking communicating technology, specifically, relate to the method for CDMA colony communication system forward power control.
Background technology
Code division multiple access (CDMA) standard belongs to one of 3G system standard system, and commercial in a plurality of countries at present, for terminal provides voice and high-speed packet data service, the terminal number that single base station can be supported is subjected to the restriction of conditions such as a yard resource, power.
The CDMA trunked communication system is a kind of to the communication system of existing C DMA network upgrade with realization specific schedule business, can make a plurality of colony terminals share Radio Resource on the one hand, improve the capacity of wireless cellular system, on the other hand, the available clustering functionality of group system can satisfy the specific (special) requirements of a part of particular terminal.Whole available channels that all terminal sharing systems of CDMA trunked communication system are had, be intrasystem arbitrary terminal want with system in another terminal call, as long as idle channel is arranged, just can under the control of central control board, utilize idle channel to converse.
In cdma system, the forward traffic channel and the reverse traffic channel of terminal are set up in pairs, corresponding forward traffic channel of each activated terminals and reverse traffic channel, and power control is carried out to each terminal forward traffic channel separately respectively in the base station, does not disturb mutually.Forward direction power control process is that each terminal sends the forward power control information to the base station by reverse traffic channel, the forward direction power control information that send according to reverse traffic channel the base station is adjusted the forward traffic channel transmitted power of the current reverse traffic channel correspondence set up.
In the CDMA trunked communication system, because a plurality of colony terminals are shared a forward shared channel (for being different from the forward traffic channel among the CDMA, the forward traffic channel that a plurality of colony terminals are shared is called forward shared channel), power control can't be carried out to each colony terminal forward traffic channel separately respectively in the base station.Therefore the method for forward power control can't directly be applied in the CDMA group system in the cdma system.And, because cdma system belongs to the self-interference system, be subjected to the influence of the network planning and some other factor, the base station sub-system forward power resources is limited, if all cluster groups under current area all send according to the forward power value that the colony terminal that is in network edge can correctly receive, system forward power can be very fast saturated, has a strong impact on the capacity of colony terminal, also the normal terminal in the current C DMA system used to affect.
Summary of the invention
The object of the present invention is to provide a kind of method of CDMA colony communication system forward power control, during with increase clustering functionality in cdma system, under the situation of the corresponding a plurality of terminals of a forward shared channel, carry out forward power control.
A kind of method of CDMA colony communication system forward power control, this method comprises:
Determine the basic transmitting power of base station, after colony terminal is set up forward shared channel, from described basic transmitting power, according to guaranteeing correct this current cluster group forward shared channel transmission power level of situation adjustment that receives of all colony terminals in the current cluster group.
The transmission power level of described adjustment forward shared channel comprises, each colony terminal is monitored the power control information from its forward shared channel simultaneously in the cluster group, whether the transmission power level of judging current forward shared channel meets the demands, if do not satisfy, then report forward power adjustment application by backward channel, the base station rules out the poorest terminal according to the parameter in the forward power adjustment application, determine current forward shared channel performance number adjustment step-length, adjust the transmission power level of current forward shared channel, otherwise the transmission power level of current forward shared channel is reduced a step-length.
The transmission power level of described adjustment forward shared channel also can comprise, each colony terminal is sent to the base station with current forward power control information in the cluster group, at regular intervals at interval, the base station judges whether that according to described current forward power control information arbitrary colony terminal expectation increases the transmission power level of forward shared channel, if then increase the transmission power level of forward shared channel, otherwise the transmission power level of reduction forward shared channel.
The invention solves colony terminal shares under the situation of forward business passage, not only make the colony terminal that is in network edge can correctly receive the content of forward shared channel, and under the correct condition that receives of the poorest terminal of reception situation, by begin to reduce the transmission power level of forward shared channel from basic transmitting power, reduce the consumption of base station forward power resources, improved power system capacity.Thereby solved under the many situations of cluster group the bottleneck problem that the situation of waste base station forward power resources is very serious, maximum cluster group number can be supported in the restriction base station.
Description of drawings
Fig. 1 realizes the schematic diagram of colony terminal forward power control for the present invention.
Fig. 2 reports the schematic diagram of forward power adjustment application for all colony terminals in the current cluster group.
Fig. 3 is for unmatched when directly reducing the transmission power level of forward shared channel under the situation that power adjustment application reports, and the base station signal overlay area changes schematic diagram.
Fig. 4 represented colony terminal two base stations overlapping covered situation when mobile.
Embodiment
Because the method for forward power control is to adjust respectively at each terminal of system in cdma system, do not influence each other, and colony terminal is shared forward traffic channel in the CDMA group system, can't carry out forward power control respectively to each colony terminal and adjust, so the method for forward power control in the cdma system can't directly be applied in the CDMA group system.
Because the distributed model of colony terminal and ordinary terminal is different, under a lot of situations, colony terminal is not equally distributed in the whole network, if current colony terminal is closer apart from the base station, channel conditions is all relatively good, by forward power control, can reduce the transmitting power of forward shared channel significantly, save forward power resources, thereby improve the forward-link capacity of system.Therefore, for satisfying the information that all colony terminals in the current cluster group can correctly receive forward shared channel, its forward power control can be adjusted according to the situation of the poorest colony terminal of situation in the current cluster group.
Embodiment 1
Referring to shown in Figure 1, Fig. 1 realizes the schematic diagram of colony terminal forward power control for the present invention.Detailed process is as follows:
Step 101 is determined the basic transmitting power of base station.When the forward shared channel of current cluster group has just been set up, because in the zone of this cluster group service, network side is not also known the distribution situation of current colony terminal, the information that can receive forward shared channel according to all colony terminals in the current cluster group of cell edge when therefore, just having begun is determined basic transmitting power.Value during base station transmitting power covered when usually, basic transmitting power can be according to network design radius of society is determined.
Step 102, after forward shared channel is finished in foundation, all colony terminals of current cluster group are monitored the information from the forward shared channel of this cluster group simultaneously, judgement from the frame error rate (FER) of current cluster group forward shared channel whether greater than certain designated value, whether can guarantee that with the transmission power level of knowing current forward shared channel colony terminal can correctly receive, if then execution in step 103, otherwise, execution in step 104.
Above-mentioned designated value can stipulate by agreement, and the target frame error rate FER=1% of CDMA forward traffic channel for example also can be according to different or some other reason setting of the priority of colony terminal.
Whether the above-mentioned transmission power level of knowing current forward shared channel can guarantee that colony terminal can correctly receive also can be judged according to other parameters, for example, whether correct whether or forward frame be whether frame or the signal to noise ratio (Eb/Nt) that calculated by frame error rate satisfy the target signal to noise ratio that colony terminal sets and judge according to the forward frame Cyclic Redundancy Check.
Step 103, colony terminal report forward power adjustment application.Be specially: colony terminal by backward channel with user ID, current FER, receiving signal sensitivity (RSSI), the ratio (Ec/Io) of actual chip energy of received signal and the general density of power and this colony terminal target Ec/Io equivalence send to the base station, the base station statistics is received the parameter of all these cluster group terminal to report in a period of time, through certain algorithm, a plurality of colony terminals are done comprehensive comparison, judge the difference set group terminal of reception situation, under the forward shared channel power requirement prerequisite that satisfies the difference set group terminal of situation, determine that the forward direction power control adjusts step-length.The shared channel forward power Control Parameter that step-length is provided by difference set group terminal is through calculating.
Backward channel herein can be Reverse Fundamental Channel (R-FCH), Reverse Dedicated Control Channel (R-DCCH), and Reverse Common Control Channel (R-CCCH) also can be Reverse Access Channel (R-ACH) or Reverse Enhanced Access Channel (R-EACH).The colony terminal that reports forward power adjustment application can be all colony terminals in the current cluster group, as shown in Figure 2; It also can be the colony terminal that needs to adjust forward power.
The above-mentioned difference set group terminal of reception situation of judging can adopt following method: at first, end objectives Ec/Io that carries in the forward power adjustment application that base station calculating reports and the difference of actual Ec/Io, in all report set group terminals, select the colony terminal of difference maximum then, handle as difference set group terminal.
The entrained parameter of above-mentioned forward power adjustment application can increase or the deletion parameter according to actual needs in the system.
Step 104 according to certain time interval, is carried out the power adjustment to forward shared channel, and from the initial basic transmitting power of just having set up, the transmission power level with forward shared channel reduces a step-length at every turn.Herein, each step sizes that reduces can dynamically be determined according to the situation of current network, the priority of this cluster group and the number and the density of the interior colony terminal of this group.
As shown in Figure 3, the covering radius of supposing the base station is R1, when just having begun to set up the cluster group, base station system is not also known colony terminal distribution situation in this sub-district, and therefore the coverage of initial basic transmitting power is R1, in a period of time, if no colony terminal is initiated forward power adjustment application in this sub-district, the transmission power level of base stations control forward shared channel reduces a step-length, and the forward power institute covering radius of representing corresponding to Fig. 3 dwindles, and becomes R2.If again through also not having colony terminal to initiate forward power adjustment application after a while, the transmission power level of base stations control forward shared channel reduces a step-length again on the basis of current transmit power, the forward power institute covering radius of representing corresponding to Fig. 3 reduces again, become R3, and the like.
For the colony terminal that is in toggle edges, need judge whether to ignore the forward power adjustment application that current colony terminal reports by the base station, be that the base station need judge whether this colony terminal has gone out the switch area of this sub-district, whether need from this sub-district this colony terminal deletion.Referring to shown in Figure 4, Fig. 4 has represented that two base stations are overlapping covered.Concrete grammar is as follows:
Colony terminal is in the base station 1 and 2 overlapping regions, base station motions, when colony terminal is in the A point, colony terminal is accepted the service of base station 1, simultaneously, pass through pilot search, found the pilot tone of base station 2, the pilot frequency intensity difference of the relative base station 1 of the pilot frequency intensity of current base station 2 is greater than the value of some settings, colony terminal merges the information from the forward shared channel of base station 1 and base station 2, if the forward frame FER colony terminal after merging does not satisfy condition, then send the forward power adjustment and apply for base station 1, adjust the forward shared channel transmitted power of base station 1.
When colony terminal moves to position B, pass through pilot search, find the value of the difference of base station 1 and base station 2 both pilot frequency intensities less than some settings, at this moment colony terminal merges the information from the forward shared channel of base station 1 and base station 2, if the forward frame FER colony terminal after merging does not satisfy condition, then send the forward power adjustment simultaneously and apply for base station 1 and base station 2, adjust the forward shared channel transmitted power of base station 1 and base station 2 simultaneously.
When colony terminal is in the C point, pass through pilot search, the difference of the frequency intensity of discovery base station 2 pilot frequency intensities and base station 1 is greater than the value of some settings, at this moment colony terminal merges the information from the forward shared channel of base station 1 and base station 2, if the forward frame FER colony terminal after merging does not satisfy condition, then send the forward power adjustment and apply for base station 2, adjust the forward shared channel transmitted power of base station 2.
Embodiment 2
At first, identical with embodiment 1 step 101, determine the basic transmitting power of base station;
Then, after setting up forward shared channel, each colony terminal all sends to the base station with forward direction power control information.Because during each power control, the forward direction power control information that each terminal is sent all will be received in the base station, and for colony terminal, terminal all is in mostly only listens under the state of not saying, cause the base station can not know current how many colony terminals that in own coverage, have on earth, when the power control information to a plurality of colony terminals compares, probably relatively not exclusively.Therefore, the base station is after receiving the power control information that each colony terminal sends, set a time parameter, in timing, the more colony terminal of base station waits reports power control parameters, these information are analyzed comparison, if there is wherein any colony terminal expectation to increase the transmission power level of forward shared channel, then increase the transmission power level of forward shared channel, if all colony terminals all expect to reduce the transmission power level of forward shared channel, then reduce the transmission power level of forward shared channel.
Group system one of characteristics be that the colony terminal number is not limited in the same cluster group, if the colony terminal in current area is many, all colony terminals all send power control information to the base station, can cause very big reverse interference, in timing, the more colony terminal of base station waits reports power control parameters, expends more reverse resource, therefore, the method for embodiment 2 is applicable to the less situation of colony terminal number in the cluster group.
Claims (10)
1, a kind of method of CDMA colony communication system forward power control is characterized in that this method comprises:
Determine the basic transmitting power of base station, after colony terminal is set up forward shared channel, from described basic transmitting power, adjust the transmission power level of this current cluster group forward shared channel according to the situation that guarantees the correct reception of all colony terminals in the current cluster group.
2, method according to claim 1 is characterized in that, the transmission power level of the current cluster group of described adjustment forward shared channel comprises,
Each colony terminal is monitored the power control information from its forward shared channel simultaneously in the cluster group, whether the transmission power level of judging current forward shared channel meets the demands, if do not satisfy, then report forward power adjustment application by backward channel, the base station rules out the poorest terminal according to the parameter in the forward power adjustment application, determine the transmission power level adjustment step-length of current forward shared channel, adjust the transmission power level of current forward shared channel, otherwise the transmission power level of current forward shared channel is reduced a step-length.
3, method according to claim 2 is characterized in that, described step-length is dynamically determined according to the priority of the situation of current network, cluster group and the terminal number in the cluster group and density.
4, method according to claim 2, it is characterized in that whether the described transmission power level of judging current forward shared channel meets the demands is that whether whether correct or forward frame be frame or judged by the signal to noise ratio that frame error rate calculated according to the cyclic redundancy check (CRC) of the frame error rate of forward shared channel or forward frame.
5, method according to claim 2 is characterized in that, the parameter in the described forward power adjustment application comprises at least, the ratio of the ratio of frame error rate, end objectives chip energy and power spectral density and received signal chip energy and power spectral density.
6, method according to claim 5, it is characterized in that, the base station rules out the poorest terminal according to the parameter in the forward power adjustment application and further comprises, the end objectives chip energy of carrying in the forward power adjustment application that base station calculating reports and the ratio and the difference of received signal chip energy of power spectral density with the ratio of power spectral density, in all reporting terminals, select the terminal of difference maximum then, as the poorest terminal.
7, method according to claim 2 is characterized in that, described forward power adjustment application is reported by the colony terminal that expectation increases the transmission power level of forward shared channel.
8, method according to claim 1, it is characterized in that, the transmission power level of the current cluster group of described adjustment forward shared channel comprises, each colony terminal is sent to the base station with the forward power control information of current forward shared channel in the cluster group, at regular intervals at interval, the base station judges whether that according to the forward power control information of described current forward shared channel arbitrary colony terminal expectation increases the transmission power level of forward shared channel, if then increase the transmission power level of forward shared channel, otherwise the transmission power level of reduction forward shared channel.
9, method according to claim 1, it is characterized in that, this method further comprises, if colony terminal is in the overlapping region that a plurality of base stations cover, merging is from the information of the forward shared channel of each base station, whether the transmission power level of judging the current forward shared channel after merging meets the demands
If do not satisfy, then report the forward power adjustment to apply for to the strong base station of pilot frequency intensity, adjust the transmission power level of the forward shared channel of this base station, if the pilot frequency intensity of each base station is identical, then cover this regional base station and report forward power adjustment application, adjust the transmission power level that all cover the forward shared channel of this regional base station to all;
If the transmission power level of the current forward shared channel after merging meets the demands, then reduce the transmission power level of forward shared channel.
10, method according to claim 1 is characterized in that, described basic transmitting power is determined according to the colony terminal that the is in cell edge information that can receive.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031552692A CN100499429C (en) | 2003-08-27 | 2003-08-27 | Forward power controlling method for CDMA clustered communication system |
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| CNB031552692A CN100499429C (en) | 2003-08-27 | 2003-08-27 | Forward power controlling method for CDMA clustered communication system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036102A1 (en) * | 2005-09-29 | 2007-04-05 | Zte Corporation | A method and device for power overload control of the trunking group forward supplimental channel |
| CN102014474A (en) * | 2010-12-23 | 2011-04-13 | 重庆邮电大学 | Closed-loop power control method of downlink shared channel in TD-SCDMA (time division-synchronization code division multiple access) cluster |
| CN103249092A (en) * | 2012-02-02 | 2013-08-14 | 华为技术有限公司 | Method and terminal for sending data |
-
2003
- 2003-08-27 CN CNB031552692A patent/CN100499429C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036102A1 (en) * | 2005-09-29 | 2007-04-05 | Zte Corporation | A method and device for power overload control of the trunking group forward supplimental channel |
| US8452318B2 (en) * | 2005-09-29 | 2013-05-28 | Zte Corporation | Method and systems for power overload control of the trunking group forward supplemental channel |
| CN102014474A (en) * | 2010-12-23 | 2011-04-13 | 重庆邮电大学 | Closed-loop power control method of downlink shared channel in TD-SCDMA (time division-synchronization code division multiple access) cluster |
| CN102014474B (en) * | 2010-12-23 | 2013-11-06 | 重庆邮电大学 | Closed-loop power control method of downlink shared channel in TD-SCDMA (time division-synchronization code division multiple access) cluster |
| CN103249092A (en) * | 2012-02-02 | 2013-08-14 | 华为技术有限公司 | Method and terminal for sending data |
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| Publication number | Publication date |
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| CN100499429C (en) | 2009-06-10 |
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