CN100433856C - Cluster multi call connecting method - Google Patents
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- CN100433856C CN100433856C CNB2005100853344A CN200510085334A CN100433856C CN 100433856 C CN100433856 C CN 100433856C CN B2005100853344 A CNB2005100853344 A CN B2005100853344A CN 200510085334 A CN200510085334 A CN 200510085334A CN 100433856 C CN100433856 C CN 100433856C
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Abstract
This invention provides a cluster multicall access method under TD-SCDMA including: A, when a cluster system sets up a down multicall channel for a cluster, it distributes a time slot for said down nulticall channel, B, distributing an unused frame/sub-frame interval number in the time slot, said frame/sub-frame interval number is the value of mode that the frame/subframe numbers get the value of a mode to the multiplexable maximum user number of a time slot, C, the cluster system sends down the distributed time slot number, the frame/subframe interval number, the multiplexable maximum user numbers of a slot t ousers of said cluster, D, the cluster user computes the received radio frame/subframe interval numbers, when the interval number is the same with that of step C, then data of the distributed time slot in said radio frame.
Description
Technical field
The present invention relates to wireless technical field, be meant a kind of cluster multi call connecting method especially.
Background technology
Wireless trunking communication system, hereinafter to be referred as group system, be a kind of less expensive of growing up in recent years, command dispatching and communication system more flexibly, be widely used in units such as government bodies, energy traffic, airport harbour, industrial and mining enterprises, fire-fighting police, water conservancy and military affairs, in order to satisfy the needs of constituent parts intercommunication.
It is voice group call service (VGCS) that group system provides the most basic business, is also referred to as the PTT business.VGCS allows the user to set up and belongs to a certain given service area and have the interior a plurality of users' of a cluster group of identical group id (ID) calling, and described service area is made up of the sub-district that several belong to same mobile services switching centre (MSC) or different MS C.VGCS adopts semiduplex mode, and the user during the calling in the cluster group can become speaker, but any one constantly only allow a speaker, and other member is a listener in this cluster group.
Fig. 1 carries out the schematic diagram of group-calling process for prior art: when setting up group calling, each sub-district that the cluster group covers is distributed a pair of up-downgoing group-calling channel respectively for this cluster group, a user in this cluster group talks by the group emission mode at the uplink group cal channel of sub-district, place as current speaker, and other users in this cluster group are subjected to pattern to listen to the speech of speaker at place cell downlink group-calling channel by winding as listener.
Present trunked communication system is based on that second generation mobile communication technology grows up, i.e. the GSM technology; Along with the maturation of 3G (Third Generation) Moblie technology, trunked communication system also will evolve to the system that adopts 3G technology, and adopting the TD-SCDMA/WCDMA technology is the evolution direction of cluster.
When using the trunking communication of TD-SCDMA system time gap, can utilize DCH channel in the TD-SCDMA system (or DSCH channel etc., principle is identical to be repeated no more) to realize the voice group call service transmission.When the VGCS call setup, network give professional each relevant cell allocation a pair of up/descending DCH channel.The uplink and downlink group-calling channel that uplink and downlink DCH channel is shared as group user respectively.The user who wants to talk monopolizes up DCH by up access procedure, organizes the emission mode speech; Other users in the sub-district monitor descending DCH, share this DCH corresponding physical resource (comprising frequency, time slot, channel code and midamble sign indicating number), are subjected to pattern to listen to the speech of speaker by winding.The DCH of group call mode is the physical layer for transmission signaling also, but the travelling carriage of different conditions is for the processing difference of physical layer signaling.Be in the descending DPCH of user's (being spoken user) demodulation the TPC information and the SS information of carrying of group emission mode, and regulate up DPCH and send; The user who is in group receive mode ignores TPC information and the SS information among the descending DPCH.All hearers have only down-going synchronous not have uplink synchronous, and the speaker keeps up-downgoing synchronous; Descending do not have power to control, and down transmitting power guarantees to cover whole cell/section, and up have power to control.
For group system, in a zone, can there be different groups, when different group datas is multiplexed into a radio frame transmission, adopt the different time slot DCH channel bearing group-calling channel separately in the subframe of this radio frames to carry out group calling communication separately.Specifically referring to the distribution of different groups channel/time slot in the TD-SCDMA radio frames as shown in Figure 2.The descending group-calling channel of the A of group all adopts the 3rd time slot (Ts3) of wireless sub-frame, and the descending group-calling channel of the B of group all adopts the 5th time slot (Ts5) of wireless sub-frame,
In theory, a time slot can hold many physical channels (size that depends on spreading factor), thereby can carry more channel, improves utilization rate of channel resources.But, in fact under the situation that does not adopt smart antenna, must cause the interchannel interference in the same time slot very big like this, reduce transmission quality.At present, the TD capacity is restricted mainly to be to mix at the branch of down channel, an ascending time slot is supported 8 code channels (shown in Ts1) as shown in Figure 2, thereby a time slot just can be distributed to 8 uplink group cal channels and use for 8 different groups with the sub-district, and a descending time slot only distributes a descending group-calling channel, (Ts0 is that system uses thereby 6 different groups at most also can only be supported to exist simultaneously in a sub-district, Ts1 uses 6 code channels to support 6 uplink group cal channels, 6 time slots of Ts2-Ts7 are supported 6 descending group-calling channels), group's quantity has been received restriction.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of cluster multi call connecting method, improves supported group number in the sub-district, thereby improves the utilance of down channel resources.
Cluster multi call connecting method provided by the invention is used for the TD-SCDMA system, and the user of certain group initiates group calling and sets up request message, and this method is further comprising the steps of:
A, receive when group system that group calling sets up request message is set up descending group-calling channel for this group in the sub-district, in radio frames, distribute a time slot for descending group-calling channel;
B, distribute a untapped frame/sub-frame interval number under the described time slot for the descending group-calling channel of described group; Number to be frame/subframe numbers can time-multiplexed maximum numbers of users carry out the value of delivery to a time slot to described frame/sub-frame interval;
C, group system can time-multiplexed maximum numbers of users be handed down to institute's distributed time slot number, frame/sub-frame interval number, time slot the user of this group;
The user of D, this group is according to the frame/subframe numbers of current radio frames/subframe, can time-multiplexed maximum numbers of users calculate the frame/sub-frame interval number of the radio frames of reception with a time slot, and when this separation dot and the described frame/sub-frame interval of step C are number identical, receive the data of distributing time slot in this radio frames, the frame number of described current wireless frame obtains from the synchronizing channel of TD-SCDMA system, extraordinarily 1 calculates two subframe numbers that described radio frames comprises according to 2 of the frame number of 2 times of the frame number of described radio frames and this radio frames.
Wherein, further comprise after the steps A: whether frame/sub-frame interval of judging described time slot number is used up, if unexhausted, and execution in step B then; If use up, then group system is redistributed a time slot for descending group-calling channel in radio frames, execution in step B.
Wherein, the described time slot of step B is can time-multiplexed maximum numbers of users relevant with cell signal, reduces along with the increase of the suffered interference of cell signal.
Wherein, the described time slot of step B can time-multiplexed maximum numbers of users requires relevantly with speech quality, reduces along with increasing of speech quality requirement.
Wherein, described the issuing of step C is that forward access channel FACH by the TD-SCDMA system issues.
Wherein, described descending group-calling channel be the TD-SCDMA system dedicated channel DCH channel or DSCH Downlink Shared Channel DSCH channel.
Wherein, further comprise: group system for when this group sets up descending group-calling channel, is a code channel in this group's uplink group cal channel allocation one time slot in radio frames in the sub-district.
By said method as can be seen, when the present invention realizes that TD-SCDMA cluster down channel is shared, channel by the identical time slot carrying of different frame/subframe transmits the information of different groups, the user of different groups receives the information of affiliated group from the channel of the identical time slot of the different frame/subframe of correspondence, realized that same time slot in frame/subframe can transmit not downlink information on the same group, has improved the utilance of down channel resources.
Description of drawings
Fig. 1 is the wireless trunking communication system structure chart.
Fig. 2 is the distribution schematic diagram of different groups channel/time slot in the TD-SCDMA radio frames.
Fig. 3 is the distribution schematic diagram of the different groups of the present invention channel at the wireless sub-frame time slot.
Fig. 4 is the distribution schematic diagram of the different groups of the present invention channel at wireless timeslot.
Fig. 5 is physical channel allocation flow figure of the present invention.
Embodiment
Referring to accompanying drawing, the present invention will be described.
Under TD-SCDMA technology, in a sub-district, when having two A of group and B, adopting the DCH channel is that example is described group calling method of the present invention as down channel, may further comprise the steps:
Step 301: the A of group one user initiates group calling and sets up request message, and this message is carried the group ID of cluster group A.The B of group one user initiates group calling and sets up request message, and this message is carried the group ID of the B of group.
Step 302: after group system receives that request message is set up in group calling, be two each sub-districts that group covered respectively initialization set up up-downgoing DCH channel, as the up-downgoing group-calling channel.
In this example, exist a sub-district promptly to belong to the group call region of the A of group, belong to the group call region of the B of group again, this sub-district need be respectively the A of group simultaneously and B sets up descending group-calling channel.Be elaborated below:
Suppose the setup requests that the A of group sends earlier, this moment, this sub-district did not have other any group callings of having set up.Group system is the A of a group allocation of downlink DCH channel, comprises timeslot number, frame/sub-frame interval number.
A sets up when group, when the B of group sends the group calling request, judge whether the frame/sub-frame interval of the corresponding timeslot number of the A of group in the radio frames number is used up, if unexhausted, then distribute the descending DCH channel of the different frame/sub-frame interval of the timeslot number identical number with the A of group that has existed for the B of group of new request; If use up (as this moment this sub-district also have other group callings to set up, and use the different frame/sub-frame interval of the corresponding timeslot number of the A of group number), then group system is redistributed another timeslot number different with the A of group and frame/sub-frame interval number.
Specifically can be referring to shown in Figure 4, be that to be with a subframe that unit carries out multiplexing, the A of group uses subframe the 5th time slot, and the B of group uses the 5th time slot of next subframe equally.Carry out multiplexing by this mode to time slot.Here need to prove, if maximum numbers of users that can be multiplexing with a time slot are called maximum timeslot multiplex coefficient, then above-mentioned frame/sub-frame interval number (frame/sub-frame interval number is meant the separation dot of frame or subframe) is the value of frame/subframe numbers to maximum timeslot multiplex coefficient delivery.For example, when the maximum timeslot multiplex coefficient of certain sub-district was N, frame/sub-frame interval number was 0,1 ... N-1.
The value of maximum timeslot multiplex coefficient can be with reference to different application scenarioss, and the different application scene can adopt different maximum timeslot multiplex coefficients, and the coefficient that disturbs big city to adopt as signal is little, and the coefficient that signal disturbs little suburb and rural area to adopt is big.Different speech qualities requires also can adopt different maximum timeslot multiplex coefficients, and speech quality requires the high coefficient that adopts little, and speech quality requires the low coefficient that adopts big.Maximum timeslot multiplex coefficient can pass through at the BCCH channel radio.
Fig. 5 is that to be with a frame that unit carries out multiplexing, and the descending time slot of two subframes of each frame is given same group of use, next frame use round-robin like this to another group.Principle repeats no more with last identical.
Step 303: group system will be the descending DCH channel massage that the A of group, B distribute, and comprise timeslot number, frame/sub-frame interval number and group ID etc., send to the hearer user of A of group and B respectively.This message can issue by the forward access channel (FACH) of TD-SCDMA system.
Step 304: the hearer user of A of group or B receives the message that group system issues and stores.
The TD-SCDMA system is a synchro system, so the synchronizing channel of the hearer user of the A of group, B by TD-SCDMA can obtain frame synchronization, promptly obtains the frame number (SFN) of current radio frames, and can obtain the maximum timeslot multiplex coefficient that step 302 issues.After knowing SFN, can calculate subframe numbers (because a frame comprises two subframes, so SFN * 2, SFN * 2+1 are the subframe numbers of two subframes that comprised) easily; The user gets the latter's mould (as N=3, current subframe numbers is, | 7/3|=1,1 is separation dot) at 7 o'clock with the former, can obtain current frame/sub-frame interval number, when this number can receive the data of the corresponding time slot of this radio frames when giving own place set of dispense identical.
Be the multiplexing method to descending group-calling channel above, for the uplink group cal channel, a time slot can have 8 code channels, supports 8 uplink group cal channels, so uply itself just adopted code division multiplexing, does not need to carry out time division multiplexing.
By the present invention, increased capacity, for example when N=3, can support 16 uplink group cal channels altogether as Ts1, Ts2, Ts3-Ts7 can support 15 descending group-calling channels altogether, thereby generally speaking this sub-district can support 15 groups to exist simultaneously, has increased group's quantity that the sub-district is supported.Though the present invention is that example illustrates that group-calling process of the present invention describes with the DCH multiplexing of channel, but being understood that, is other channels when what distribute, as the DSCH channel during as group-calling channel, use method of the present invention, that can realize the down channel that distributed equally multiplexingly realizes group calling.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of cluster multi call connecting method is used for the TD-SCDMA system, and the user of certain group initiates group calling and sets up request message, it is characterized in that, this method is further comprising the steps of:
A, receive when group system that group calling sets up request message is set up descending group-calling channel for this group in the sub-district, in radio frames, distribute a time slot for descending group-calling channel;
B, distribute a untapped frame/sub-frame interval number under the described time slot for the descending group-calling channel of described group; Number to be frame/subframe numbers can time-multiplexed maximum numbers of users carry out the value of delivery to a time slot to described frame/sub-frame interval;
C, group system can time-multiplexed maximum numbers of users be handed down to institute's distributed time slot number, frame/sub-frame interval number, time slot the user of this group;
The user of D, this group is according to the frame/subframe numbers of current radio frames/subframe, can time-multiplexed maximum numbers of users calculate the frame/sub-frame interval number of the radio frames of reception with a time slot, and when this separation dot and the described frame/sub-frame interval of step C are number identical, receive the data of distributing time slot in this radio frames, the frame number of described current wireless frame obtains from the synchronizing channel of TD-SCDMA system, extraordinarily 1 calculates two subframe numbers that described radio frames comprises according to 2 of the frame number of 2 times of the frame number of described radio frames and this radio frames.
2, method according to claim 1 is characterized in that, further comprises after the steps A:
Judge whether the frame/sub-frame interval of described time slot number is used up, if unexhausted, execution in step B then; If use up, then group system is redistributed a time slot for descending group-calling channel in radio frames, execution in step B.
3, method according to claim 1 is characterized in that, the described time slot of step B is can time-multiplexed maximum numbers of users relevant with cell signal, reduces along with the increase of the suffered interference of cell signal.
4, method according to claim 1 is characterized in that, the described time slot of step B can time-multiplexed maximum numbers of users requires relevantly with speech quality, reduces along with increasing of speech quality requirement.
5, method according to claim 1 is characterized in that, step C is described to issue is that forward access channel FACH by the TD-SCDMA system issues.
6, method according to claim 1 is characterized in that, dedicated channel DCH channel that described descending group-calling channel is the TD-SCDMA system or DSCH Downlink Shared Channel DSCH channel.
7, method according to claim 1 is characterized in that, further comprises: group system for when this group sets up descending group-calling channel, is a code channel in this group's uplink group cal channel allocation one time slot in radio frames in the sub-district.
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| CN101553030B (en) * | 2008-04-03 | 2011-06-01 | 华为技术有限公司 | Method and equipment for repeatedly using same time slot by multiple users |
| US20170208609A1 (en) * | 2016-01-20 | 2017-07-20 | Microchip Technology Incorporated | Time Triggered Communication Channel In A Synchronous Network |
| CN108093477B (en) * | 2016-11-23 | 2021-02-19 | 成都鼎桥通信技术有限公司 | Method and device for allocating downlink resources in cluster voice system |
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| KR20050055821A (en) * | 2003-12-09 | 2005-06-14 | 한국전자통신연구원 | Time slot assignment method in time division multiplex system |
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Patent Citations (7)
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| WO1999063686A1 (en) * | 1998-05-29 | 1999-12-09 | Nokia Networks Oy | A method for data transmission in a cellular telecommunication system |
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