CN101098512B - Method for maximizing packet number accommodated by CDMA cluster communication system - Google Patents

Abstract

The invention relates to a method for maximizing group number contained by CDMA group communication system, wherein for one object group, according to the group size and occupied region number, obtaining the group number loaded by each region if the group call is strengthened, for the object group, according to the occupied region number, obtaining the group number loaded by each region if using traditional group, comparing the group numbers obtained in aforementioned two steps, using the larger one as the group call mode of the group. The invention can fully utilize system resource, via which network can contain more groups, and the capacity of group system can be maximized.

Description

Make the method for the group number maximum that the CDMA cluster communication system held

Technical field

The present invention relates to cluster communication system, particularly a kind of power system capacity that how to make in the CDMA cluster communication system reaches maximum method.

Background technology

In group system, cluster multi call has two kinds of implementations usually: strengthen group calling and conventional group calling.

Strengthen group calling:

As Fig. 1, when group calling was set up, each user will set up two forward channels and a backward channel respectively.Wherein, a forward channel is used to transmit user signaling information and power control information (F_FCH); Another forward channel is responsible for speech frames (F_SCH).This forward direction voice channel that each user distributed in the same group has identical identification code, like this, each has distributed the terminal of forward direction voice channel to decode to this channel in this group under the same contained fan, the energy that terminal receives is exactly the stack power of all forward direction voice channels in the group under this contained fan, as long as this stack power can satisfy the most serious user's normal communication of decline.Each excited users in the group all distributes a backward channel (R_FCH), but only receives that the terminal of network side authorization message could transmit speech on this channel.So, say that the backward channel that the user uses is responsible for speech frames, forward direction power control bit and signaling message, listen user's backward channel only to transmit forward direction power control bit and signaling message.

The resource allocation that strengthens group calling is accurate to each user, and the reciprocation of system and terminal is strong, is convenient to the state that system understands terminal at any time.And be not subjected to the restriction of dispatcher-controlled territory, as long as the network coverage to the place can set up the enhancing group-calling service.Shortcoming is if single sector is concentrated a lot of users down, and is limited at aspects such as power resource, channel resources easily.Strengthen group calling and under the situation that group user is disperseed very much or moving range is very big, have clear superiority.

Conventional group calling:

Conventional group calling has solved and has strengthened the group calling limited problem of capacity of eating dishes without rice or wine.The principal character of conventional group calling business is: the interior user of support group is unrestricted under single contained fan, can utilize Limited resources, supports a large number of users to concentrate on the command scheduling function under the situation of same place.

As Fig. 2, when group calling was set up, scheduling was distinguished the shared forward direction voice channel (F_FCH) of interior each sub-district assignment and is oppositely said subscriber channel (R_FCH_T), forward signaling channel (F_SCH) that assignment is shared and the reverse subscriber channel (R_FCH_L) of listening.The forward direction voice channel is responsible for transmitting forward direction speech frame and signaling message; Oppositely say the user speech channel, be responsible for transmitting reverse speech frame and signaling message; Forward signaling channel is responsible for sending system parameter and Neighboring Cell List message; Oppositely listen the subscriber signaling channel, in the most of the time, be in the Transmitter Turn-Off state, have only when user applies is made a speech, be responsible for transmitting the right of speech demand signalling.

Conventional group calling has remedied the shortcoming that strengthens group calling.Because channel has been realized sharing at physical layer, thereby supports limitless volumes in single set of sectors, has remarkable advantages so be set to conventional cluster for the very concentrated group of user; But because sharing fully of forward channel can't realize rapid power control, the group number that holds under the same contained fan is limited, so be distributed to the situation of a lot of sub-districts for the user, conventional group calling does not have advantage.Conventional group calling only provides service in the scheduling district generally speaking, and the outer service that do not provide is provided in scheduling.

Can know to the realization principle that strengthens group calling and conventional group calling that according to above-mentioned it still is that conventional group calling is very big for the population size influence of network that group call adopts the enhancing group calling, so adopt which kind of group calling significant.

In the prior art, adopt conventional group calling in following two kinds of situations, other situations all adopt the enhancing group calling:

1, for workplace relatively fixing (being that the user substantially moves or moving range is no more than the coverage of 2 sub-districts), on average each sub-district surpasses 10 users' group;

2, for workplace fixing (being that the uncertain or moving range of user moving range surpasses 2 sub-districts), on average each sub-district surpasses 20 users' group.

The basic point that conventional group calling and enhancing group calling are divided in the prior art is whether the user is intensive, but the not quantification of intensive criterion all is to determine according to experience, can't accomplish the resource distribution of optimum.

Summary of the invention

The technical problem to be solved in the present invention is, overcomes the defective of prior art, and providing a kind of method select each group to adopt to strengthen group calling still is the method for conventional group calling, and it is maximum that the group number that system is held reaches.

Technical scheme of the present invention may further comprise the steps:

Steps A: for certain group that need set up, according to it group size and take sector number, adopt to strengthen group calling if draw, the group number that every contained fan can carry:

A1 draws the group number that system forward can carry according to the distribution condition of system forward channel power at each channel:

$n*\frac{1}{N}*{\mathrm{\β}}_1*P+n*(\frac{Y}{N}-\frac{1}{N}*{\mathrm{\β}}_1)*\mathrm{\α}*P=35*0.4*P$

Wherein, n is for strengthening the group number that group calling oppositely can be held;

A3 compares both, if get the group number that minimum value adopts enhancing group calling to carry as this group;

Step B: the group that will set up hereto, according to its sector number that takies, adopt conventional group calling if draw, the group number that every contained fan can carry:

B1 draws the group number that system forward can carry according to the power resource allocation situation of system forward channel:

$\frac{1-{10}^{\frac{225-255}{40}}-{10}^{\frac{219-255}{40}}-{10}^{\frac{185-255}{40}}}{[({\mathrm{\β}}_2+\mathrm{\ϵ})+(1-{\mathrm{\β}}_2)*\mathrm{\α}*\frac{1}{6}]*\mathrm{\γ}}=x$

Wherein, the group number that x can hold for the conventional group calling forward direction, ε accounts for the percentage of total time for the F_SCH signaling channel transmits the signaling time;

B2 draws the group number that system reverse can carry according to the disturbed condition of system reverse channel:

$y*{\mathrm{\β}}_2*\frac{1}{N}*P+y*\mathrm{\θ}*1.5*P=35*0.4*P$

Wherein, y is the group number that conventional group calling oppositely can hold, and θ accounts for the percentage of total time, β for the R_FCH_L signaling channel transmits the right to apply for words signaling time ₂For user under the conventional group calling situation accounts for the percentage of total time the time of speaking;

B3 compares both, if get the group number that minimum value adopts conventional group calling to carry as this group;

The group number that two kinds of group call modes among step C: comparison step A, the B can carry is got the greater, as the group call mode of this group.

In such scheme, the ratio γ that channel full rate transmitting power accounts for the sub-district design power is:

$\mathrm{\γ}=\frac{\mathrm{ffchpower}}{\mathrm{cellpower}}$

$\mathrm{ffchpower}=10\log \mathrm{cellpower}+10\log 2+10\log \{{10}^{\frac{X-255}{40}}\×\frac{22}{24}+{10}^{\frac{X+20-255}{40}}\×\frac{2}{24}\}$

Wherein, ffchpower is certain channel power, and cellpower is the design power of sub-district, and X is the digital gain of channel.

Adopt the present invention that system resource is fully used, network can hold more group, and the capacity of group system obtains maximization.

Description of drawings

Fig. 1 takies situation map for same contained fan strengthens group-calling channel resource down;

Fig. 2 takies situation map for conventional group calling channel resource under the same contained fan;

Fig. 3 is a selection group call mode flow chart of the present invention.

Embodiment

Below in conjunction with accompanying drawing 3, set forth specific implementation of the present invention.

Steps A: for certain group that will set up, according to it group size and take sector number, adopt to strengthen group calling if draw, the group number that every contained fan can carry.

A1 draws the group number that system forward can carry according to the resource allocation conditions of system forward channel

The voice activation factor of normal speech is 0.4.Pilot channel digital gain 225, synchronizing channel digital gain 185, paging channel digital gain 219, voice channel digital gain 169.

The ratio that the transmitting power of voice channel digital gain 169 accounts for the sub-district design power is:

γ＝1.671％

Voice call is both sides, so the time of speaking for unique user just only accounts for 50% of total duration, adds the time that the tone is paused, thought deeply, and thinks that the voice activation factor is 0.4.The reverse traffic channel of group calling, always occupied, can regard original voice user's both call sides as all respectively has a up channel, so be similar to the voice activation factor.

The business that strengthens group calling also has group-calling channel activity factor β=0.8, because 20% time user's speech privilege is seized and thought deeply, 80% time is used for speech.

Shared forward direction voice channel of the user of same group under the same contained fan in the group.During idle condition, this channel is with 1/8 speed transmitting power; The listen state of making peace is the full rate transmitting power.

Each user distributes a forward channel to be used to transmit signaling information in addition, keeps the speed of α=1/8.

If the group number that enhancing group calling forward direction can hold is m, group size is Y, and the shared sector number of group is N, and the transmitting power of normal speech full rate is P.

Computing formula at a contained fan ventrocephalad capacity is:

$m*\frac{Y}{N}*\frac{P}{8}+m*(0.8*P+0.2*\frac{P}{8})=\frac{1-{10}^{\frac{225-255}{40}}-{10}^{\frac{219-255}{40}}-{10}^{\frac{185-255}{40}}}{\mathrm{\γ}*0.4}*0.4*P*0.55$

The right molecule multiply by the size that 0.4*P is meant all users' actual emission power in the sector again divided by voice user's number that (γ * 0.4) expression sector can hold; 0.55 be the calling ratio, just removed the shared power section of soft handover.

Be reduced to:

$\frac{m*Y}{N}+6.6*m=178.65$

Promptly

$m=\frac{178.65}{\frac{Y}{N}+6.6}$

A2 draws the group number that system reverse can carry according to the resource allocation conditions of system reverse channel

If the group number that the enhancing group calling oppositely can be held is n, the cellular system reverse capacity is 35 users, and the computing formula of every contained fan reverse capacity is:

$n*\frac{1}{N}*0.8*P+n*(\frac{Y}{N}-\frac{1}{N}*0.8)*\frac{P}{8}=35*0.4*P$

Be reduced to:

$\frac{n}{N}*(28+5*Y)=560$

Promptly $n=\frac{560*N}{28+5*Y}$

Relatively m and n if m＜n then makes A=m, otherwise make A=n.

Step B: the group that will set up hereto, according to its sector number that takies, adopt conventional group calling, the group number that every contained fan can carry if draw.

Pilot channel digital gain 225, synchronizing channel digital gain 185, paging channel digital gain 219.

User in the group of conventional group calling is very many, therefore the time ratio of right of speech time of seizing and thinking strengthens group calling and wants big, the time that is approximately θ=20% according to statistics is used for right of speech seizes, and 10% time, the time of β=70% was used for speech because thinking and reaction.

Shared forward direction voice channel of the user of same group under the same contained fan in the group.The speed of idle condition is α=1/8, and the speed of the listen state of making peace is 1.

Shared forward signaling channel of the user of same group under the same contained fan in the group.When message sent, this channel was set up and is 1 to send with speed; This channel is not non-existent when having message to send.According to statistics, the in esse time of this channel accounts for about ε=10% of calling out total air time.

For conventional group calling, in order to save forward power more, when nobody's speech, when just speech frame is 1/8 speed, take that 4 frames send 1/8 rate frame in per 24 frames, all the other 20 frames do not send.So actual 1/6 of 1/8 speed transmitting power that is equivalent to.

F_FCH and F_SCH be forward emitting power fixedly, and the average channel gain representative value all is 191, and the ratio that conventional group calling forward direction voice channel and signaling channel full rate power account for the sub-district design power is:

γ＝5.9288％

B1 is according to the power resource allocation situation of system forward channel, determines that it is x that group number that system forward can carry is established the group number that the conventional group calling forward direction can hold, and the computing formula of then every contained fan forward-link capacity is:

$\frac{1-{10}^{\frac{225-255}{40}}-{10}^{\frac{219-255}{40}}-{10}^{\frac{185-255}{40}}}{[(0.7+0.1)+(1-0.7)*\frac{1}{8}*\frac{1}{6}]*\mathrm{\γ}}=x$

The equivalent transmitting power (70% time) of denominator first: an x group under the F_FCH full rate state under the sector and the equivalent transmitting power (10% time) of F_SCH.

The equivalent transmitting power (30% time) of the F_FCH1/8 speed of denominator second portion: an x group under same sector.

Wherein: F_SCH is a forward complement channel, is used for transmitting signaling; F_FCH is a forward fundamental channel, is used for transmitting voice.

By formula as can be known, the sector that forward-link capacity and group take is irrelevant, and no matter how many sectors group takies, and taking of the forward direction resource in each sector all is consistent.

x＝14

B2 is a normal voice calls with the group calling equivalence, according to the disturbed condition of system reverse channel, determines the group number that system reverse can carry

Reverse turn-on channel transmitting power is than the high 1.76dB of traffic channel transmission power, promptly 1.5 times.

According to above analysis, establishing the group number that traditional group oppositely can hold is y, and the computing formula of every contained fan reverse capacity is:

$y*0.7*\frac{1}{N}*P+y*0.2*1.5*P=35*0.4*P$

Equation left side first: the equivalent transmitting power of y the R_FCH_T of group under a sector.

Equation left side second portion: the equivalent transmitting power of y the R_FCH_L of group under same sector.

Equation the right is the power equivalence value when reverse capacity is maximum under same sector.

Wherein, R_FCH_T is for oppositely saying user's dedicated channel

R_FCH_L oppositely listens user's dedicated channel

This simplified formula is:

$y=\frac{14}{\frac{0.7}{N}+0.3}$

Relatively x and y if x＜y then makes B=x, otherwise make B=y.

Step C: if A＞B then adopts to strengthen group calling, otherwise adopts conventional group calling, as the group call mode of this group.

Claims (2)

1. method that makes the group number maximum that the CDMA cluster communication system held may further comprise the steps:

Steps A: for certain group that need set up, according to it group size and take sector number, adopt to strengthen group calling if draw, the group number that every contained fan can carry; Described enhancing group calling is meant that when group calling was set up, each user will set up two forward channels and a backward channel respectively; Wherein, a forward channel is used to transmit user signaling information and power control information; Another forward channel is responsible for speech frames; This forward direction voice channel that each user distributed in the same group has identical identification code; Each excited users in the group all distributes a backward channel, but only receives that the terminal of network side authorization message could transmit speech on this channel;

Al draws the group number that system forward can carry according to the distribution condition of system forward channel power at each channel:

$m*\frac{Y}{N}*\mathrm{\α}*P+m*({\mathrm{\β}}_1*P+(1-{\mathrm{\β}}_1)*\mathrm{\α}*P)=\frac{1-{10}^{\frac{225-255}{40}}-{10}^{\frac{219-255}{40}}-{10}^{\frac{185-255}{40}}}{\mathrm{\γ}*0.4}*0.4*P*0.55$

Wherein, m is for strengthening the group number that the group calling forward direction can hold, and Y is a group size, and N is the shared sector number of group, and P is the transmitting power of channel full rate, and α is the ratio of actual channel power and full rate transmitting power, β ₁The user accounts for the percentage of total time the time of speaking under the group calling situation in order to strengthen, and γ is the ratio that channel full rate transmitting power accounts for the sub-district design power, and 225,219,185 is respectively the digital gain of pilot channel, paging channel, synchronizing channel;

A2 draws the group number that system reverse can carry according to the disturbed condition of system reverse channel:

$n*\frac{1}{N}*{\mathrm{\β}}_1*P+n*(\frac{Y}{N}-\frac{1}{N}*{\mathrm{\β}}_1)*\mathrm{\α}*P=35*0.4*P$

Wherein, n is for strengthening the group number that group calling oppositely can be held;

A3 compares both, if get the group number that minimum value adopts enhancing group calling to carry as this group;

Step B: the group that will set up hereto, according to its sector number that takies, adopt conventional group calling, the group number that every contained fan can carry if draw; Described conventional group calling is meant that when group calling was set up, scheduling was distinguished the shared forward direction voice channel of interior each sub-district assignment and oppositely said subscriber channel, forward signaling channel that assignment is shared and the reverse subscriber channel of listening; The forward direction voice channel is responsible for transmitting forward direction speech frame and signaling message; Oppositely say the user speech channel, be responsible for transmitting reverse speech frame and signaling message; Forward signaling channel is responsible for sending system parameter and Neighboring Cell List message; Oppositely listen the subscriber signaling channel, in the most of the time, be in the Transmitter Turn-Off state, have only when user applies is made a speech, be responsible for transmitting the right of speech demand signalling;

B1 draws the group number that system forward can carry according to the power resource allocation situation of system forward channel:

$\frac{1-{10}^{\frac{225-255}{40}}-{10}^{\frac{219-255}{40}}-{10}^{\frac{185-255}{40}}}{[({\mathrm{\β}}_2+\mathrm{\ϵ})+(1-{\mathrm{\β}}_2)*\mathrm{\α}*\frac{1}{6}]*\mathrm{\γ}}=x$

Wherein, the group number that x can hold for the conventional group calling forward direction, ε are the F SCH signaling channel transmission signaling time to account for the percentage of total time;

B2 draws the group number that system reverse can carry according to the disturbed condition of system reverse channel:

$y*{\mathrm{\β}}_2*\frac{1}{N}*P+y*\mathrm{\θ}*1.5*P=35*0.4*P$

Wherein, y is the group number that conventional group calling oppositely can hold, and θ accounts for the percentage of total time, β for the R_FCH_L signaling channel transmits the right to apply for words signaling time ₂For user under the conventional group calling situation accounts for the percentage of total time the time of speaking;

B3 compares both, if get the group number that minimum value adopts conventional group calling to carry as this group;

The group number that two kinds of group call modes among step C: comparison step A, the B can carry is got the greater, as the group call mode of this group.

2. the method for the group number maximum held of the described CDMA of the making cluster communication system of claim 1 is characterized in that the ratio γ that channel full rate transmitting power accounts for the sub-district design power is:

$\mathrm{\γ}=\frac{\mathrm{ffchpower}}{\mathrm{cellpower}}$

$\mathrm{ffchpower}=10\log \mathrm{cellpower}+10\log 2+10\log \{{10}^{\frac{X-255}{40}}\×\frac{22}{24}+{10}^{\frac{X+20-255}{40}}\×\frac{2}{24}\}$

Wherein, ffchpower is certain channel power, and cellpower is the design power of sub-district, and X is the digital gain of channel.

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