CN100375415C - Forward power control method of CDMA cellular trunked system - Google Patents
Forward power control method of CDMA cellular trunked system Download PDFInfo
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- CN100375415C CN100375415C CNB031397379A CN03139737A CN100375415C CN 100375415 C CN100375415 C CN 100375415C CN B031397379 A CNB031397379 A CN B031397379A CN 03139737 A CN03139737 A CN 03139737A CN 100375415 C CN100375415 C CN 100375415C
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Abstract
The present invention discloses a forward power control method of a CDMA honeycomb cluster system in the field of mobile communication. In the method, two concentrated control points are set at first, wherein one control point is used for the unified processing of power control commands, and the other control point is used for unified distribution for the forward power. In the process of the unified processing of power control commands, the power control commands are collected and appropriate power control commands are selected at first; then corresponding communication channels for forward supplement are identified. In the process of the unified distribution of power resource programs, the total emission power of the communication channel for forward supplement in the last sector group is collected at first, and the collected total emission power is distributed to the identified communication channel for forward supplement; the emission power of the non identified communication channel for forward supplement in the group is set as the appointed minimum of the CDMA honeycomb cluster system, and the communication channel for forward supplement in the group obtains latest emission power. Compared with the prior art, the present invention can enhance the control speed and accuracy of the communication channel for forward supplement in the sector group, so the forward mistake frame rate and the system hang-up rate of the CDMA honeycomb cluster system are effectively lowered.
Description
Technical field
The present invention relates to field of mobile communication, relate in particular to the Poewr control method in the CDMA cellular group system.
Background technology
Along with the continuous development of economic life, people are for the continuous increase of exchange and conmmunication demand, and communication system has become the indispensable instrument of social every field activity day by day.Demand promotes innovation, and mechanics of communication is also fast-developing under growing demand promotes.In moving communicating field, the user has been not content with the present situation of existing point-to-point conversation, not only require communication system to have the voice quality height, multi-functional, characteristics such as reliability height, but also many added value service demands have been proposed mobile communcations system, wherein require present cell mobile communication systems to have the function of message cluster transmition, become more and more users' current demand, Given this, the honeycomb trunked communication system arises at the historic moment, this system combines cellular communication system and specific schedule communication system (digital cluster system), both expanded the scope of business of cellular communication system, and made digital cluster system break away from the specific-dispatching communication system again in function and regional limitation.
Present honeycomb trunked communication system can be divided into TDMA (time division multiple access) according to access way and C surveys two kinds of standards of A (code division multiple access).In the third generation communication technology ripe day by day today, the cellular communication system of TDMA standard since exist can not the 3G smooth evolution, defective such as capacity is limited and data throughout is low, can't satisfy growing communication requirement, be eliminated gradually.The cellular communication system of CDMA standard then has the wide-band spread spectrum air interface, can well satisfy the demand of third generation wireless communication system.Traditional voice service not only is provided, and Packet data service at a high speed can be provided.The cdma cellular communication system is combined with digital cluster system, both can improve digital cluster system number of users in the single sector, can on the basis of high-speed packet data service, develop the new business that more has the digital cluster system characteristics again.
The practical application of cdma cellular communication system shows that the capacity of mobile communication system not only depends on the capacity of reverse link, also is subjected to the restriction of forward link capacity generally speaking.The cdma cellular trunked communication system is to have introduced the semiduplex characteristics of group system with the difference of the cdma cellular communication system that generally adopts at present, and promptly the user service data that forward direction sends in a group is identical.If way according to existing cdma cellular communication system, for each user in the group distributes an independently forward traffic channel, because system is concentrated sudden, making to need to set up a large amount of Traffic Channels in the synchronization sub-district, it is very fast to make that forward power rises, and causes problems such as forward direction overload, channel congestion, regular traffic interruption.Simultaneously, system concentrated sudden also can cause the voice activation factor of cdma cellular communication system (it is the sign indicating number subsystem of self-interference that CDMA divides my communication system, and a certain user's transmitting power is exactly to disturb for other users.Because people can not keep full rate to speak always, transmitting power will reduce during therefore non-full rate) lost efficacy, suppose that the voice activation factor is 0.5, the forward-link capacity that then has the system of clustering functionality reduces half than common cdma cellular communication system forward-link capacity, make the total capacity of system reduce greatly, under these circumstances, people have proposed the solution thinking of forward compensatory channel sharing in the cdma cellular group system.With the CDMAA2000 system is example, and forward compensatory channel sharing distributes a Forward Dedicated Control Channel (transmitting user's dedicated signaling) and forward complement channel (transmission user service data) for exactly same sector group user (sector group user refers to belong in the same sector user of same cluster group) separately.Forward Dedicated Control Channel distributing independent Walsh sign indicating number (this yard is used to distinguish different forward channels by the orthogonality of different Walsh) and frame biasing (with the frame is that unit distributes a plurality of frame biasings, can avoid focusing on a plurality of user data).Forward complement channel distributes identical Walsh sign indicating number, frame biasing and Long Code Mask (this yard has the function that scrambling is maintained secrecy).After output was through stack, the signal of forward complement channel can be regarded as one road signal, so just can be good at realizing sharing the purpose of forward direction user service data, thereby effectively saved the forward link power resource.The function of forward link power control realizes reasonable distribution forward traffic channel power exactly, make the transmitting power of forward channel as far as possible little under the situation that satisfies travelling carriage demodulation required signal-to-noise ratio, reduce forward emitting power to greatest extent, minimizing increases the relative capacity of forward link to the interference of neighbor cell.
Compare with the legacy cellular cdma system, the cdma cellular group system is shared forward traffic channel, and the effect of forward power control is bigger to the influence of system.At first, the forward direction user data is received by a plurality of users, forward power is controlled the forward direction frame error rate that has then determined a plurality of users rather than unique user, and (data are that unit forms a frame with 20 milliseconds, the afterbody of frame has check code, does not just think that by verification this frame is wrong if receive decoded frame); Secondly, a plurality of users independently determine to send to the forward power control command of base station in the same sector group according to received signal separately, same like this sector group forward complement channel transmitted power is the result of a plurality of user's emission power of forward supplementary channel stacks, when a plurality of forward emitting powers were more or less the same, the emission power of forward supplementary channel of stack may make that the amplitude of total forward power rising (decline) is bigger; At last, in most cases the forward emitting power of each sector is to be subjected to receive in this group the most weak user of forward signal to control, and other users' of this group forward emitting power is tending towards lower limit in the sector.If at this moment receive the most weak conversation loss of forward signal (perhaps leaving this sector), emission power of forward supplementary channel may be very low, in a period of time, make the forward direction frame error rate raise, also may cause the group user call drop when serious because having little time to rise sufficiently high forward emitting power.As previously mentioned, share the cdma cellular group system of forward traffic channel and use traditional forward additional channel power control, cause frame error rate to rise and conversation loss easily inadequately fast with accurate.
Summary of the invention
The objective of the invention is to overcome the quick inadequately and accurate shortcoming of cdma cellular group system forward additional channel power control of the shared forward traffic channel that exists in the prior art, with propose a kind of can be under the situation that does not increase hardware cost, the method that can quick and precisely control to the power of sharing forward traffic channel cdma cellular group system forward complement channel.
For achieving the above object, the present invention proposes a kind of cdma cellular group system forward power control method, it is characterized in that, may further comprise the steps:
A centralized control point at first is set, the power control command of all user feedbacks in the same sector group (if be 1, is indicated the forward channel power per liter; If be 0, power falls in the indication forward channel) unify to handle; A centralized control point is set in addition, the forward power of same sector group is distributed unitedly;
Based on this, further comprise the steps:
The first step: unified processing power control command
This step further comprises the following steps:
1. collect all power control commands in the group of user feedback, from these power control commands, select suitable power control command (, otherwise just reducing emission power of forward supplementary channel) as long as there is a customer requirements power per liter just to rise emission power of forward supplementary channel;
2. according to the power control command sign corresponding forward compensatory channels of selecting, if certain customer requirements power per liter just identifies this user's corresponding forward compensatory channels (selecting first user if a plurality of customer requirements power per liter are arranged), otherwise selects last user ID;
Second step: unified distribution power resource
This step further comprises the following steps:
1. collect last forward compensatory channels in sector cluster total emission power;
2. the last forward compensatory channels in sector cluster total emission power that will collect is distributed to the forward complement channel of sign;
3. the transmitting power of the forward complement channel that does not identify in the group is changed to the minimum of system's appointment;
4. forward complement channel obtains latest emission power according to the power and the power control command that distribute in the group.
Adopt the method that focuses on the forward additional channel power control command of user feedback in the sector group of the present invention, compared with prior art, the control rate and the precision of forward compensatory channels in sector cluster be can improve, thereby forward direction frame error rate, system's cutting off rate of system reduced effectively.
Description of drawings
Fig. 1 is the forward power control chart of common cdma system.
Fig. 2 is the centralized forward power control chart that the present invention proposes.
Fig. 3 is a cdma cellular group system forward power control method flow chart of the present invention.
Fig. 4 is independent control sector group emission power of forward supplementary channel analogous diagram.
Fig. 5 is independent control sector group forward complement channel received power analogous diagram.
Fig. 6 is a centralized control sector group emission power of forward supplementary channel analogous diagram.
Fig. 7 is a centralized control sector group forward complement channel received power analogous diagram.
Embodiment
If do not add special instruction, forward emitting power hereinafter described all is meant in the same sector, user's forward traffic channel transmitting power of same group.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Fig. 1 shows the forward additional channel power control procedure of common cdma system.At first set up forward complement channel by the base station, and initialization forward traffic channel transmitting power; The per 20 milliseconds of statistics frame error rate of travelling carriage obtain new signal-noise ratio threshold then, and per 1.25 milliseconds of signal to noise ratios of obtaining received signal simultaneously are by the power control command that rises or descend with the more controlled base station of signal-noise ratio threshold forward additional channel power.The power control command that travelling carriage sends is extracted in last base station, and according to power control command current transmit power is increased and decreased, and obtains up-to-date emission power of forward supplementary channel.As can be seen from Figure 1, each user's forward complement channel is independently to control according to the power control command of user feedback, but the power control command of user feedback is to draw according to the forward additional channel power that receives all user's emissions in the sector group.Therefore, the user independently carries out forward additional channel power control and can not reach ideal control effect in the sector group.
Fig. 2 shows the centralized forward power control procedure of cdma cellular group system.At first forward complement channel is set up in the base station, and initialization forward traffic channel transmitting power, the per 20 milliseconds of statistics frame error rate of travelling carriage obtain new signal-noise ratio threshold, per 1.25 milliseconds of signal to noise ratios of obtaining received signal simultaneously are by the power control command that rises or descend with the more controlled base station of signal-noise ratio threshold forward additional channel power.Centralized control is carried out to the power control command that travelling carriage in the sector group sends in the base station then, as long as total there is a customer requirements power per liter just to rise the transmitting power of sector group forward complement channel, otherwise just reduce the total transmitting power of forward complement channel.The power control mode difference of Centralized Power Control mode and current C DMA system is that it is not to increase and decrease on the basis of current additional channel power according to the power control command that travelling carriage feeds back, but according to the power control command of travelling carriage feedback the current power of all complement channels in the sector group is once redistributed.In the cluster cellular system, use Centralized Power Control to be based on 2 considerations.At first, the power control command of user feedback is independently in the sector group.If control these users' forward complement channel independently, then superposeing these transmitting powers after overpower control may be more than last transmitting power height (low).The power of supposing conventional system (declines) step-length that rises is 1dB, has the approaching user of 10 emission power of forward supplementary channel in the sector group and all requires liter (a falling) power, and then this transmitting power is than the high 10dB of last transmitting power.Secondly, in most cases the forward emitting power of each sector is to be subjected to receive in this group that the most weak user of forward signal to control, and other users' of this group forward emitting power is tending towards lower limit in the sector.If at this moment receive that the most weak conversation loss of forward signal (perhaps leaving this sector), current forward complement channel actual emission power may be very low, in a period of time, make the forward direction frame error rate raise, also may cause the group user call drop when serious because having little time to rise sufficiently high forward emitting power.
Fig. 3 shows the centralized forward power control flow chart of cdma cellular group system.At first same forward compensatory channels in sector cluster transmitting power of last time is all collected, and the power control command that belongs to same sector group user that receives in 1.25 milliseconds is collected by the base station.If there is the power control command of an example (or many cases) customer requirements power per liter in the power control command of collecting, Base Station Identification user corresponding forward compensatory channels (if many cases then select a wherein example); If all be the power control command that falls power, the base station identifies a forward complement channel arbitrarily.The total transmit power allocations of the last sector group forward complement channel that will collect of base station is given the forward complement channel of sign then, and gives in the same sector group the not power lower limit of the forward complement channel distribution system of sign regulation.Every forward complement channel latest emission power for same sector group, will be according to the transmitting power of their distribution and the power control command independent process of reception, these channel transmitting power superpose at output, in fact have only the transmitting power of sign forward complement channel really to work, other channel transmitting power are tending towards lower limit.
Fig. 4～Fig. 7 shows independent forward additional channel power control and concentrates the emulation comparison diagram of forward additional channel power control.Here suppose that base station transmitting power is 16 watts, it is that 1% o'clock expectation received power is-75dBm that travelling carriage satisfies frame error rate, and 6 users are arranged in the sector group, and the customer location random distribution also moves at random with 60 kilometers/hour.
The purpose of power control is exactly that the travelling carriage received power is fluctuateed near the received power of expectation, and the variance of fluctuation is as far as possible little.Control is exactly to wish that arbitrary moment has only a user (the most weak received power user) to fluctuate near the received power of expectation to the power of sector group, and other users are on expectation received power.
As seen from Figure 4, the transmitting power of individual power control mode is mainly by user's control of weak received power, if user's received power and this user are approaching in addition, then the power control command of its feedback can not be ignored the influence of power in the emission of sector group forward complement channel.
Can see that from Fig. 5 and Fig. 7 the concentration power control mode has only a user to fluctuate near expectation received power, other users nearly all are higher than this expectation received power, and the concentration power control mode is lower than the frame error rate of individual power control mode like this.
It is excessive that the centralized forward power control method that the present invention proposes can solve cdma cellular group system forward power adjusting range effectively, and main controlling user call drop (switching) back is to problems such as whole group in the sector produce a very large impact.
Claims (4)
1. a cdma cellular group system forward power control method is characterized in that, may further comprise the steps:
A centralized control point is set, the power control command of all user feedbacks in the same sector group is unified to handle; A centralized control point is set in addition, the forward power of same sector group is distributed unitedly;
Based on this, further comprise the steps:
The first step: unified processing power control command
This step comprises the following steps:
1. all power control commands in the group of collection user feedback are selected power control command from these power control commands; Described power control command is selected according to being: as long as there is a customer requirements power per liter just to rise emission power of forward supplementary channel, otherwise just reduce emission power of forward supplementary channel;
2. according to the power control command sign corresponding forward compensatory channels of selecting,, otherwise select last user ID if certain customer requirements power per liter just identifies this user's corresponding forward compensatory channels; Second step: unified distribution power resource
This step comprises the following steps:
1. collect last forward compensatory channels in sector cluster total emission power;
2. the last forward compensatory channels in sector cluster total emission power that will collect is distributed to the forward complement channel of sign;
3. the transmitting power of the forward complement channel that does not identify in the group is changed to the minimum of system's appointment;
4. forward complement channel obtains latest emission power according to the power and the power control command that distribute in the group.
2. cdma cellular group system forward power control method according to claim 1 is characterized in that, if described power control command is 1, then indicates the forward channel power per liter; If be 0, then indicate forward channel to fall power.
3. cdma cellular group system forward power control method according to claim 1 is characterized in that, in the described first step step 2, if there are a plurality of customer requirements power per liter to select first user, identifies this user's corresponding forward compensatory channels.
4. cdma cellular group system forward power control method according to claim 1, it is characterized in that, the concrete mode of " all power control commands in the group of collection user feedback " is in the described first step step 1: the per 20 milliseconds of statistics frame error rate of travelling carriage obtain new signal-noise ratio threshold, per 1.25 milliseconds of signal to noise ratios of obtaining received signal simultaneously are by the power control command that rises or descend with the more controlled base station of signal-noise ratio threshold forward additional channel power.
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| CN1235492A (en) * | 1998-04-14 | 1999-11-17 | 三星电子株式会社 | Method and system for optimizing for ward power control in CDMA system |
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Effective date of registration: 20180703 Address after: California, USA Patentee after: Global innovation polymerization LLC Address before: 518057 Department of law, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen Patentee before: ZTE Corp. |
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Granted publication date: 20080312 |