CN101022296B - Control method for sharing forward additional channel power overloading - Google Patents
Control method for sharing forward additional channel power overloading Download PDFInfo
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- CN101022296B CN101022296B CN2006100113293A CN200610011329A CN101022296B CN 101022296 B CN101022296 B CN 101022296B CN 2006100113293 A CN2006100113293 A CN 2006100113293A CN 200610011329 A CN200610011329 A CN 200610011329A CN 101022296 B CN101022296 B CN 101022296B
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Abstract
A method for controlling power overload of shared forward complementary channel includes confirming maximum power being allowed to reach of shared forward complementary channel, decreasing actual power of shared forward complementary channel to be said maximum power by decreasing power of one or multiple forward complementary channel with power being greater than average power when actual power of said shared forward complementary channel is greater than said maximum power.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of method of group's forward compensatory channel sharing power overload control of the CDMA mobile communication systems of supporting group service.
Background technology
Trunked communication system is meant one group of wireless channel of multiple users share, and dynamically uses the dedicated mobile communications subsystem of these channels, and it is a kind of commander, dispatching patcher.The honeycomb trunked communication system combines cellular communication system and specific schedule communication system, has both expanded the scope of business of cellular communication system, makes trunked communication system break away from the specific schedule communication system in function and regional limitation again.And CDMA (code division multiple access) cellular communication system is combined with digital clustering communication system, both can improve group 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 group system characteristics again.
The cdma cellular communication system is the sign indicating number subsystem of self-interference, and a certain user's transmitting power is exactly to disturb for other users.And trunking communication has the advantages that to transmit voice simultaneously to a large number of users, if be each user's distributing independent channel in the group in based on the trunked communication system of cdma cellular communication system, then can bring huge impact to the capacity of system.Therefore, need adopt the mode of sharing to realize to the channel of transmit traffic data content, and be generally complement channel.
Forward compensatory channel sharing is exactly that the base station respectively assigns a forward complement channel for same sector group user (sector group user refers to belong in the same sector user of same cluster group), is used for transmitting user service data.Every forward complement channel has identical Walsh sign indicating number, frame biasing and Long Code Mask; The traffic frame content of synchronization is identical.That is to say that though the data that these forward complement channels transmit are encoded independently and modulated, through stack, in fact they can regard one road signal as at final output.
Because the forward complement channel of digital clustering communication system group user is identical Walsh sign indicating number, the frame of same number of frames content is after ovennodulation and spread spectrum and merging, and at this moment the sector transmission power calculation mode of cluster sector transmission power and common cdma system is with different.In the common cdma system, use the Walsh sign indicating number to distinguish different users, when the user who uses different Walsh sign indicating numbers superposeed, the stack of the power of different user was a linear superposition.And the forward complement channel of cluster group user is identical Walsh sign indicating number, and the transmitting power of each group is that each user transmits in the group amplitude is carried out square operation later on again through linear superposition and obtained in the sector.At this moment user's emission power of forward supplementary channel will be dependent quadratic relationship in the same group of common sector, rather than independently linear superposition concerns.
The variation of group user number will make the upper lower limit value of sector group emission power of forward supplementary channel change, and change very violent (for example the sector group number of users is 20 and, and group's forward complement channel is shared the transmitting power threshold value and differed 400 times) at 1 o'clock.If the user is too much in the sector group like this, the emission power of forward supplementary channel of group user stack may make forward complement channel share the too high even appearance overload of transmitting power.Because this power Nonlinear Superposition characteristics of digital clustering communication system, make to be necessary each cluster group under each contained fan is carried out independent power overload control, make the shared transmitting power of forward complement channel of digital clustering communication system group user be controlled in the suitable scope.
Summary of the invention
Technical problem to be solved by this invention provides a kind of control method of forward compensatory channel sharing power overload, solve the emission power of forward supplementary channel Nonlinear Superposition that has the cdma cellular trunked communication system of sharing forward traffic channel in the prior art, it is bigger even the technical problem of forward power overload occurs to make forward complement channel share transmitting power control ascensional range.
For achieving the above object, the invention provides a kind of control method of forward compensatory channel sharing power overload, its characteristics are, comprise: the forward compensatory channel sharing of determining the group user in the sector of trunked communication system allows the maximum power that reaches, if the actual power of described forward compensatory channel sharing is greater than described maximum power, then by reducing the power of power greater than one or more forward complement channels of average power, ensureing under the condition of power more than or equal to described average power of described forward complement channel, the actual power of described forward compensatory channel sharing is being reduced to described maximum power.
Above-mentioned method, its characteristics are that described average power is the performance number of described maximum power divided by the number gained of described forward complement channel.
Above-mentioned method, its characteristics are, further comprise the steps:
Step 1 determines that described forward compensatory channel sharing allows the maximum power that reaches;
Step 2 judges that whether the actual power of described forward compensatory channel sharing surpasses described maximum power, is then to calculate difference between described actual power and the described maximum power as the shared channel difference, otherwise end;
Step 3 is determined the number of the forward complement channel that uses in the described group;
Step 4 is calculated when described forward compensatory channel sharing and is in maximum power following time, every needed average power of described forward complement channel;
Step 5, will be above the forward complement channel of average power controlling object as power control, under the condition of power that ensures described controlling object more than or equal to described average power, by reducing the power of one or more described forward complement channels as controlling object, the actual power of described forward compensatory channel sharing is reduced to described maximum power.
Above-mentioned method, its characteristics are that described step 5 further comprises:
Step a judges whether the forward complement channel above average power: if having, select one as controlling object; If do not have, finish;
Step b calculates the current power of described controlling object and the difference between the described average power as the controlling object difference;
Whether step c judges described controlling object difference greater than described shared channel difference, is execution in step d then, otherwise execution in step f;
Steps d is reduced the power of described controlling object, and following tone pitch is described shared channel difference, finishes;
Step f to described average power, forwards the power decreasing of described controlling object to step a.
Above-mentioned method, its characteristics be, in described step 1, the maximum power that described forward compensatory channel sharing allows to reach is got same wireless configuration and the common forward complement channel of next bar of channel speed and allowed the maximum power that reaches.
Above-mentioned method, its characteristics are that in described step 1, the maximum power that described forward compensatory channel sharing allows to reach is according to practical application needs value
Above-mentioned method, its characteristics are that described trunked communication system is the CDMA cellular trunked communication system.
Above-mentioned method, its characteristics are, in described step a, select a power to surpass the forward complement channel of average power as controlling object with random fashion.
Above-mentioned method, its characteristics are, in described step a, select a power to surpass the forward complement channel of average power as controlling object in a sequential manner.
Technique effect of the present invention is:
The power overload controlling method of in the cdma cellular trunked communication system, realizing cluster group forward complement channel of proposition of the present invention, can effectively the forward complement channel of trunked communication system group be shared transmitting power and be controlled at suitable scope, solve because the Nonlinear Superposition of cluster group forward complement channel makes cluster group forward complement channel share the too high problem of transmitting power.
Further describe specific embodiments of the invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the flow chart of steps of the inventive method;
Fig. 2 cluster group forward additional channel power control flow
Embodiment
The present invention is directed in the prior art that to exist the cdma cellular trunked communication system emission power of forward supplementary channel Nonlinear Superposition of sharing forward traffic channel may make forward complement channel share transmitting power control ascensional range bigger even the characteristics of forward power overload occur, propose a kind of cluster group forward additional channel power overloading control that in the cdma cellular trunked communication system, realizes, the forward complement channel of digital clustering communication system cluster group user is shared transmitting power be controlled at method in the suitable scope.
Fig. 1 is the flow chart of steps of the inventive method, and this method may further comprise the steps:
Step 201: determine in the sector that a group user forward compensatory channel sharing allows the maximum power that reaches.
Because in fact forward compensatory channel sharing can regard a channel aloft as, so this value can be got identical RC (Ridio Configure radio configuration) and the common forward complement channel of next bar of channel speed and be allowed the maximum power that reaches, or according to practical application needs value.
Step 202: whether the forward compensatory channel sharing power of judging a group in the sector has surpassed the maximum power value that the first step is determined.If surpass, calculate the difference of actual power value and maximum power value, and preserve this difference to be used for following step.
Step 203: determine forward complement channel number that group uses in the sector, determine such as the modem module operating state of preserving by statistics application layer software.
Step 204:, calculate when forward compensatory channel sharing power is taken at the definite maximum power of step 201 every needed average power of forward complement channel according to the forward complement channel number in the previous step.
Step 205: will be above the forward complement channel of average power as controlling object, concrete operations are as follows:
Judge whether forward complement channel above average power, if the forward complement channel of selection is arranged, if the difference that is produced when its power is reduced to average power is greater than the group's forward compensatory channel sharing actual power value of preserving and the difference of maximum power value, then the power of this forward complement channel is deducted the difference of group's forward compensatory channel sharing actual power value and maximum power value, this moment, group's forward compensatory channel sharing actual power promptly was reduced to maximum power value, the difference that is group's forward compensatory channel sharing actual power value and maximum power value is zero, and overload control finishes; Otherwise, then this forward additional channel power is reduced to average power, and the group's forward compensatory channel sharing actual power value of preservation and the difference of maximum power value is deducted consequent difference.Repeating this step is zero up to the difference of group's forward compensatory channel sharing actual power value and maximum power value.
Hereinafter described method with single contained fan place an order the group be example.
Figure 2 shows that the main flow process of this Poewr control method.Step 101 is used to set the ideal maximum value of group's forward compensatory channel sharing power; Step 102 is used for obtaining the performance number of group's current shared forward complement channel reality; Step 103 has not surpassed desirable maximum in order to the actual power value that compares the shared complement channel of group's forward direction, is, then carries out power control; Step 104 is calculated the difference between group's forward compensatory channel sharing actual power and the desirable maximum power, after operation in, must not surpass this difference to the performance number sum of each user's forward complement channel reduction; Step 105 obtains the forward complement channel number in the group; When step 106 hypothesis will make group's forward compensatory channel sharing power reach ideal maximum value, every average power that forward complement channel need reach; Difference between step 107 pair group's actual power and the ideal maximum value is judged, if difference is proceeded power control greater than zero,, difference finishes this power control in case equalling zero, in order to prevent to adjust group's performance number low and influence the speech quality of group user; Step 108 surpasses the forward complement channel of average power as adjusting object with actual power value in certain algorithm (in proper order, at random) selection group; Step 109 judges that whether difference between group's forward compensatory channel sharing actual power and the desirable maximum power is greater than the difference between forward complement channel actual power and the average power in the step 108; Step 110 is adjusted into the user's forward additional channel power value in the step 108 average power of determining in the step 106; Step 111 deducts the difference in the step 104 the power difference of adjusting in the step 110 and producing; Step 112 is adjusted into current actual power value with the user's forward additional channel power value in the step 108 and deducts difference in the step 104; Step 113, this moment, group surpassed power difference all eliminations of desirable maximum power, and the difference that is provided with in the step 104 is zero.
The power overload controlling method of in the cdma cellular trunked communication system, realizing cluster group forward complement channel of proposition of the present invention, can effectively the forward complement channel of trunked communication system group be shared transmitting power and be controlled at suitable scope, solve because the Nonlinear Superposition of cluster group forward complement channel makes cluster group forward complement channel share the too high problem of transmitting power.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (7)
1. the control method of a forward compensatory channel sharing power overload, it is characterized in that, comprise: the forward compensatory channel sharing of determining the group user in the sector of trunked communication system allows the maximum power that reaches, if the actual power of described forward compensatory channel sharing is greater than described maximum power, then by reducing the power of power greater than one or more forward complement channels of average power, ensureing under the condition of power more than or equal to described average power of described forward complement channel, the actual power of described forward compensatory channel sharing is being reduced to described maximum power; Described method further comprises the steps:
Step 1 determines that described forward compensatory channel sharing allows the maximum power that reaches;
Step 2 judges that whether the actual power of described forward compensatory channel sharing surpasses described maximum power, is then to calculate difference between described actual power and the described maximum power as the shared channel difference, otherwise end;
Step 3 is determined the number of the forward complement channel that uses in the described group;
Step 4 is calculated when described forward compensatory channel sharing and is in maximum power following time, every needed average power of described forward complement channel;
Step 5, will be above the forward complement channel of average power controlling object as power control, under the condition of power that ensures described controlling object more than or equal to described average power, by reducing the power of one or more described forward complement channels as controlling object, the actual power of described forward compensatory channel sharing is reduced to described maximum power;
Wherein, described step 5 further comprises:
Step a judges whether the forward complement channel above average power: if having, select one as controlling object; If do not have, finish;
Step b calculates the current power of described controlling object and the difference between the described average power as the controlling object difference;
Whether step c judges described controlling object difference greater than described shared channel difference, is execution in step d then, otherwise execution in step f;
Steps d is reduced the power of described controlling object, and following tone pitch is described shared channel difference, finishes;
Step f to described average power, forwards the power decreasing of described controlling object to step a.
2. method according to claim 1 is characterized in that, described average power is the performance number of described maximum power divided by the number gained of described forward complement channel.
3. method according to claim 1 is characterized in that, in described step 1, the maximum power that described forward compensatory channel sharing allows to reach is got same wireless configuration and the common forward complement channel of next bar of channel speed and allowed the maximum power that reaches.
4. method according to claim 1 is characterized in that, in described step 1, the maximum power that described forward compensatory channel sharing allows to reach is according to practical application needs value
5. method according to claim 1 is characterized in that, described trunked communication system is the CDMA cellular trunked communication system.
6. method according to claim 1 is characterized in that, in described step a, selects a power to surpass the forward complement channel of average power as controlling object with random fashion.
7. method according to claim 1 is characterized in that, in described step a, selects a power to surpass the forward complement channel of average power as controlling object in a sequential manner.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264422A2 (en) * | 2000-03-17 | 2002-12-11 | QUALCOMM Incorporated | Forward-link scheduling in a wireless communication system |
| EP1281244A2 (en) * | 2000-05-12 | 2003-02-05 | QUALCOMM Incorporated | A method and an apparatus for improving stability and capacity in cdma medium data rate systems |
| CN1567784A (en) * | 2003-07-04 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Forward power control method of CDMA cellular trunked system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264422A2 (en) * | 2000-03-17 | 2002-12-11 | QUALCOMM Incorporated | Forward-link scheduling in a wireless communication system |
| EP1281244A2 (en) * | 2000-05-12 | 2003-02-05 | QUALCOMM Incorporated | A method and an apparatus for improving stability and capacity in cdma medium data rate systems |
| CN1567784A (en) * | 2003-07-04 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Forward power control method of CDMA cellular trunked system |
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