CN1275409C - Sharing forward alternate channel method of CDMA standard trunked communication system - Google Patents
Sharing forward alternate channel method of CDMA standard trunked communication system Download PDFInfo
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- CN1275409C CN1275409C CN 03139738 CN03139738A CN1275409C CN 1275409 C CN1275409 C CN 1275409C CN 03139738 CN03139738 CN 03139738 CN 03139738 A CN03139738 A CN 03139738A CN 1275409 C CN1275409 C CN 1275409C
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Abstract
The present invention discloses a method of sharing forward supplement channels for CDMA system cluster communication systems in the field of mobile communication. Firstly, a mobile terminal or a network side originates a cluster call; a base station enters a flow of processing cluster business, and negotiates to establish a forward special control channel and a reverse special control channel with the mobile terminal; secondly, the base station establishes the forward special control channel; if successful, continuing the operation; else ending; thirdly, the base station establishes a forward supplement channel command to allocate a forward modulation resource for the mobile terminal originating the call so as to transfer user business data; finally, the cluster business flow is ended. Compared with a CDMA honeycomb cluster system not sharing forward channels, the method of sharing forward supplement channels for CDMA system cluster communication systems, which is put forward by the present invention, can effectively enhance system capacity. Simultaneously, the mode for sharing forward channels also avoids the impact of a great number of business channels simultaneously established in sectors to the systems.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to all 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 use the dedicated mobile communications subsystem of these channels, it is a kind of commander, dispatching patcher, in some social economies, the relatively advanced country of industrial or agricultural, there is application very widely in this system in the departments such as enterprise, cause, industrial and mineral, oil field, farm, public security, police and army that commander, scheduling feature are had relatively high expectations.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-dispatching communication system in function and regional limitation again.Present honeycomb trunked communication system can be divided into TDMA (Time Division Multiplex Access time division multiple access) and two kinds of standards of CDMA (Code Division Multiplex Access code division multiple access) according to access way.In the third generation communication technology ripe day by day today, the TDMA standard exists and can not can't satisfy growing communication requirement to third generation communication system smooth evolution, defective such as capacity is limited and data throughout is low.And cdma system has the wide-band spread spectrum air interface, can satisfy the demand of third generation wireless communication system, and 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 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 trunked communication system main feature of CDMA standard is to adopt half-duplex communication mode, can realize continuing fast, and support group call (being the method for calling of one-to-many).In trunked communication system, require user's shared forward channel in same sub-district in the group, when group user is called out or is talked, as long as pin PTT (Push To Talk, push-to-talk) key just can be conversed with other users in the group, and this PTT business is widely used in intercom system and group system, be public security, fire-fighting, communications and transportation, airport aviation, construction site, big assembly, groups such as military scheduling use provides the command scheduling function.Along with the progress of society, the enhancing of flow of personnel, the fast development of simultaneous mobile communication technology, the field of personal communication is more and more wider, group service also turns to the individual to use gradually, between for example young fashion personage or the chat in the groupuscule, the communication between the household internal member etc.Demand is brought the innovation of technology, uses the development that brings product, along with extensively carrying out of mobile communication value-added service, has the trunked communication system of the CDMA standard of colony's calling, message sending function, has become a kind of new mobile value-added application day by day.
The CDMA standard group communication system is that the CDMA standard group communication system user data that forward direction sends in a group is identical with an important difference of common CDMA Cellular System, its key character is " getting ready to go into action in hundreds ", if simple superposition trunked communication system on the basis of traditional C DMA cellular communication system, just distribute a fully independently forward traffic channel to each user in the group, will produce following defective: at first, intrinsic concentrated sudden the making of trunked communication system may need to set up a large amount of Traffic Channels in the synchronization sub-district, thereby it is very fast that forward power is risen, cause forward direction overload (just the forward emitting power of Yao Qiuing surpasses the base station maximum transmission power), channel congestion, regular traffic interrupts; On the other hand, trunked communication system concentrated sudden makes that also (cdma system is the sign indicating number subsystem of self-interference, and a certain user's transmitting power is exactly to disturb for other users for the voice activation factor of CDMA Cellular System.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 0.4, then the group system forward-link capacity reduces over half than common cdma system forward-link capacity, that is to say, if the voice activation factor lost efficacy, the number of users that system supports will reduce over half.At present, still none effective ways addresses this problem.
Summary of the invention
The objective of the invention is to solve that the insurmountable CDMA standard group communication system of prior art forward direction overload is serious, channel congestion and the regular traffic disruption that causes, and the very few problem of number of users of system's support, transship and channel congestion to propose a kind of can avoiding, and support the forward compensatory channel sharing method of the CDMA standard group communication system of more users number.
For achieving the above object, the present invention proposes a kind of forward compensatory channel sharing method of CDMA standard group communication system, it is characterized in that, may further comprise the steps:
The first step: portable terminal or network side are initiated trunked call, and the base station enters the Processing Cluster operation flow; Reverse Dedicated Control Channel before the merchant sets up;
The 3rd step: the modem chip of base station applies course base station physical layer sends and sets up forward direction and Reverse Dedicated Control Channel order, as sets up the Forward Dedicated Control Channel success, then continues, otherwise forwards for the 5th step to;
The 5th step: set up the forward complement channel order by the transmission of base station applies course base station modulates demodulation chip,, be used for transmitting user service data for the portable terminal that makes a call distributes a forward direction modulation resources;
The 6th step: finish cluster service flow.
Compare with the cdma cellular group system of not sharing forward channel, the forward compensatory channel sharing method that the present invention proposes the CDMA standard group communication system can improve power system capacity effectively.Simultaneously, the mode of sharing forward channel has also avoided setting up simultaneously in the sector impact of a large amount of Traffic Channels to system.
Description of drawings
Fig. 1 is that the channel of realizing the cellular system of group service is formed structure chart.
Fig. 2 is the forward compensatory channel sharing method flow chart of CDMA standard group communication system of the present invention.
Fig. 3 is the forward compensatory channel sharing method analogous diagram of CDMA standard group communication system of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further described: the CDMA standard group communication system that the present invention proposes is the cdma cellular mobile communication system and the combining of group system, therefore this honeycomb trunked communication system can be supported all functions of existing cdma cellular mobile communication system, also supports the follow-up upgrading of cdma cellular mobile communication system.
In CDMA standard group communication system forward compensatory channel sharing method of the present invention, when initiating a group (when a plurality of users belong to some groups when portable terminal, synchronization can only have a user to speak, other users can only answer) calling the time, sharing of all forward complement channels of the same group in same sector realized in the base station.Whenever because the semiduplex characteristics of group system, have only a user to speak in the group.Therefore, the business datum of complement channel transfer system is great waste for power system capacity if each user uses independently.The forward complement channel of distinguishing different user is to realize by user's Walsh sign indicating number (orthogonality by different Walsh is used to distinguish different forward channels) and Long Code Mask (function that has scrambling to maintain secrecy), (with the frame is that unit distributes a plurality of frame biasings in the frame of different forward complement channels biasing simultaneously, the frame of different forward complement channels biasing in the time of can avoiding focusing on (with the frame is that unit distributes a plurality of frame biasings, can avoid focusing on a plurality of user data) also may be different.In order in the sector, to share the business datum of same group user, distribute identical Walsh sign indicating number, Long Code Mask and frame biasing for these users' forward complement channel, that is to say, though the data that these forward complement channels transmit are encoded independently and are modulated, but through stack, in fact they can regard one road signal as at final output.These users' forward complement channel can be merged into a forward complement channel transmission like this.
The preceding backward channel that Fig. 1 uses when showing honeycomb group system Processing Cluster business.
Wherein, the effect of Forward Dedicated Control Channel is to send user's dedicated signaling on Traffic Channel, and the effect of Reverse Dedicated Control Channel (business datum and the signaling that are used for the specific user transmit) is user's dedicated signaling and the user service data that the demodulation portable terminal sends.The effect of forward complement channel is to transmit user service data.
The honeycomb group system that the present invention proposes comprises two kinds of forward traffic channels when realizing in cdma system: Forward Dedicated Control Channel and forward complement channel.Wherein, Forward Dedicated Control Channel is in order to transmit the control signaling of each user self special use.Forward complement channel is in order to transmit the business datum that same sector user has in the group, and this is by group system half-duplex (whenever can only have a people to speak at most) characteristics decision.
Fig. 2 shows the forward compensatory channel sharing method flow chart of CDMA standard group communication system.At first initiate trunked call by portable terminal or network side, the base station enters the Processing Cluster operation flow and portable terminal utilizes paging channel and access channel to carry out Signalling exchange respectively.Course base station modulates demodulation chip is sent out and is set up forward direction and Reverse Dedicated Control Channel order on the base station then, and interior each user of same sector group will take two modem modules and carry out forward signal modulation and reverse signal demodulation respectively.Every Forward Dedicated Control Channel all will dispose independently Walsh sign indicating number, identical frame biasing and Long Code Mask, and the Long Code Mask of every Reverse Dedicated Control Channel calculates according to the Electronic Serial Number of portable terminal.Again then on the base station course base station modulates demodulation chip send out and set up the forward complement channel order, each user will take a modem module and carry out the modulation of forward complement channel signal in the same sector group.Same sector user shares in order to realize forward complement channel in the group, and every forward complement channel all will dispose identical Walsh sign indicating number, frame biasing and Long Code Mask.To the user of group in the same sector, identical in order to guarantee in the traffic frame content of these forward complement channels of synchronization, a centralized control point in the base station carries out centralized control to the transmitting time of these traffic frames.
Fig. 3 shows the analogous diagram that realizes that honeycomb group service forward complement channel is shared.The environmental condition of emulation is: the sector radius is that 1000 meters, greatest path loss are that 135dB, forward fundamental channel maximum power are that 1800 milliwatts, every sector number of users are 30, the voice activation factor is 0.4 (the typical environment parameter that this group parameter is system emulation).Under typical set groupcall pattern, rate of arriving calls (each user when each is busy) is 1.2, the average call retention time is that 21 seconds, per call send that number of times is 4, the channel time out is 6 seconds, telephone traffic was that 0.027Erlang, group's number are 5 when the user was busy, the voice activation factor is 0.4, the radio frequency blocking probability is 5%.Under the typical cellular call model, rate of arriving calls (each user when each is busy) is 0.6, the average call retention time is 132 seconds, telephone traffic was that 0.022Erlang, the voice activation factor are 0.4 when the user was busy, the radio frequency blocking probability is 5%, the average call switching rate is 4/ minute.As can be seen, under same sector number of users, along with cluster user is counted the ratio increase, the base station forward emitting power reduces.In fact, suppose to remove the forward emitting power that forward direction overhead channel (pilot channel, synchronizing channel, paging channel) and Traffic Channel take, the forward emitting power of surplus 10W also, each user's average full rate transmitted power is 0.8W.Do not sharing under the forward channel mode, because one group of cluster user all is in the full rate state simultaneously, the voice activation factor lost efficacy, and the system that can obtain supports 10/0.8=12.5 user.And under shared forward channel mode, because user's forward compensatory channel sharing in the group supposes that the forward additional channel power of 2W can guarantee that edge customer correctly receives; Each user also each has a Forward Dedicated Control Channel (or forward fundamental channel) that transmits power control commands and signaling, Forward Dedicated Control Channel has the probability of power emission about about 10%, and system can support (10-2)/(0.8*0.1)=100 user like this.
Claims (3)
1, a kind of forward compensatory channel sharing method of CDMA standard group communication system is characterized in that, may further comprise the steps:
The first step: portable terminal or network side are initiated trunked call, and the base station enters the Processing Cluster operation flow;
Second step: base station and portable terminal utilize paging channel and access channel to send signaling to the other side respectively, Reverse Dedicated Control Channel before consulting to set up;
The 3rd step: the modem chip of base station applies course base station physical layer sends and sets up forward direction and Reverse Dedicated Control Channel order, as sets up the Forward Dedicated Control Channel success, then continues, otherwise forwards for the 5th step to;
The 5th step: setting up the forward complement channel order by the transmission of base station applies course base station modulates demodulation chip, is that the portable terminal that makes a call distributes a forward direction modulation resources;
The 6th step: finish cluster service flow.
2, the forward compensatory channel sharing method of CDMA standard group communication system according to claim 1 is characterized in that, Reverse Dedicated Control Channel had Walsh sign indicating number independently, identical frame biasing and Long Code Mask before the first step was described.
3, the forward compensatory channel sharing method of CDMA standard group communication system according to claim 1, it is characterized in that, the 6th step, described forward complement channel all had identical Walsh sign indicating number, frame biasing and Long Code Mask, and the traffic frame content of synchronization is identical.
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| CN 03139738 CN1275409C (en) | 2003-07-04 | 2003-07-04 | Sharing forward alternate channel method of CDMA standard trunked communication system |
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| CN 03139738 CN1275409C (en) | 2003-07-04 | 2003-07-04 | Sharing forward alternate channel method of CDMA standard trunked communication system |
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| CN1275409C true CN1275409C (en) | 2006-09-13 |
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| CN100438384C (en) | 2005-10-20 | 2008-11-26 | 华为技术有限公司 | Carrier channel configuration method in multiple carrier communication system |
| CN100455070C (en) * | 2005-12-12 | 2009-01-21 | 中兴通讯股份有限公司 | Establishment and control for CDMA digital packet calling |
| CN108632769B (en) * | 2017-03-21 | 2020-08-14 | 大唐移动通信设备有限公司 | Group complementary building method and device |
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