CN100353772C - Multicast service subline data transmission method and device - Google Patents
Multicast service subline data transmission method and device Download PDFInfo
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- CN100353772C CN100353772C CNB2004100584305A CN200410058430A CN100353772C CN 100353772 C CN100353772 C CN 100353772C CN B2004100584305 A CNB2004100584305 A CN B2004100584305A CN 200410058430 A CN200410058430 A CN 200410058430A CN 100353772 C CN100353772 C CN 100353772C
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Abstract
The present invention discloses a method for transmitting down data of a multicasting service, which is applied to a time division multiplexing code division multiple access system. The method mainly comprises the following procedures: a mapping relationship for mapping dedicated service channels assigned to all the user equipment in a group to the same down physical channel group is predetermined; multicasting service data broadcast to the user equipment in the group is bore by the same down physical channel group according to the predetermined mapping relationship, and a share of multicasting service data is broadcast to all the corresponding user equipment. Besides, the present invention also discloses a corresponding device for transmitting the down data of the multicasting service. The present invention which solves the problem of down resource sharing of the multicasting service can greatly save vacancy port frequency resources.
Description
Technical field
The present invention relates to multicasting technology, in particular, the present invention relates to a kind of method and device that is applied to multi-cast business data transmission in the system of tdd CDMA system (TD-SCDMA, Time Division-Synchronization Code DivisionMultiple Access).
Background technology
Mobile communication has developed into 3G (Third Generation) Moblie (3G at present, Third Generation), TD-SCDMA is that in May, 2000 is by (the ITU of International Telecommunications Union, InternationalTelecommunication Union), March calendar year 2001 is by one of three main standard of the 3G (Third Generation) Moblie of third generation partner program (3GPP, The 3rdGeneration Partnership Project) approval.As the 3G standard of time division multiplexing mode, TD-SCDMA is used as the time-division multiplex technology scheme of low spreading rate (1.28MCps, 1.28 million chips/sec) in the ITU standard.
Along with the maturation gradually of TD-SCDMA technology, traditional trunked communication system also can be applied on the 3G mobile system based on TD-SCDMA technology.The typical services of trunking communication is a multicast, has unique talker and a plurality of listener in multicast service.For all listeners, the downlink data of its reception is identical, for example, press-and-talk (PTT, Push To Talk) i.e., " PTT " business, its main business can be spoken after being characterized as the PTT button that the user presses the PTT terminal, network directly sends to this user's voice the member of whole group, the PTT communication mode adopts the half-duplex operation mode, be the user when speaking other users can only answer and can not talk, when unclamping the PTT button after the user finishes words, other users just can press the PTT button request speech of PTT terminal separately.
At present,, usually, during multi-cast business data, to send to the user of a plurality of connected states, just must on eating dishes without rice or wine, transmit repeatedly with a business datum on TD-SCDMA, realizing also solution preferably not of multicast service.For example realize the PTT multicast service, each user who listens to multicast can distribute a downlink dedicated Traffic Channel at down direction, and the Dedicated Traffic Channel of different mobile phones can be mapped on the different physical channels.The downlink dedicated Traffic Channel of each mobile phone all adopts physical channel separately to carry like this, and is uncorrelated mutually.
With reference to figure 1, this figure is that a kind of typical multicast service down channel mapping transmits schematic diagram.As shown in the figure.User apparatus service channel Mapping is to separately physical channel carrying, and such scheme is not obviously considered the particularity of PTT business, has caused the waste of interface-free resources on down direction.
To sum up, there is following shortcoming in present multicast service downlink data transmission:
1, relatively waste on resource is used.If for example have 100 listeners are arranged in the PTT business, will set up 100 down physical channels on the air interface and carry identical voice messaging, talker's a piece of data can copy as 100 parts of identical data on the interface aloft.Even the listener concentrates in one or the limited several sub-districts, this situation also can not get any optimization, has wasted valuable frequency resource, has also reduced the PTT user capacity of whole system.
2, because the channel resource of a sub-district is limited, if each user needs dedicated channel, maximum PTT numbers of users of a sub-district must be subjected to the restriction of downlink resource so: be under 3: 3 the situation in the uplink and downlink timeslot Typical Disposition, maximum 16 physical channels of each time slot, then maximum 48 down physical channels in sub-district.If the listener relatively concentrates (for example the fire fighter concentrates in the building fire-fighting mansion), then surpassing in 48 users' the sub-district to have certain customers can't receive the data of multicast.Demand for some private network can't be met like this, has limited the application of system.When capacity was limited, the feasibility of jumbo multicast service also hardly might.
3, because the special-purpose Code Channel of descending employing must carry out descending power control, the control channel of up so also necessary configure dedicated sends the out-hole run report.Cause number of users in the sub-district further to be subjected to the restriction of ascending resource like this.Seemingly restricted with down channel resources, all can cause the limitation of PTT service application.
Summary of the invention
The technical problem that the present invention solves provides a kind of multicast service downlink data transmission method and device, with eat dishes without rice or wine frequency resource and improve downlink capacity of further saving.
For addressing the above problem, multicast service downlink data transmission method of the present invention comprises:
The default Dedicated Traffic Channel that will distribute to each subscriber equipment in the group is mapped to the mapping relations of same down physical channel group;
The multi-cast business data that will be broadcast to subscriber equipment in the group according to described default mapping relations is by described same down physical channel group carrying, and a multi-cast business data is broadcast to corresponding each subscriber equipment.
Optimize, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
Optimize, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to corresponding each dedicated transmission channel;
Each dedicated transmission channel is mapped to same down physical channel group.
Wherein, described down physical channel group comprises one or more physical channel, and is configured on a time slot or a plurality of complete time slot.
Correspondingly, down transmission device of the present invention comprises:
The mapping inking device, the mapping relations that are used for being mapped to according to the default Dedicated Traffic Channel that will distribute to each subscriber equipment in the group same down physical channel group are carried out corresponding mapping configuration;
Conveyer is used for the multi-cast business data that mapping relations according to described configuration will be broadcast to subscriber equipment in the group and carries by described same down physical channel group, and a multi-cast business data is broadcast to corresponding each subscriber equipment.
Optimize, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
Optimize, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to corresponding each dedicated transmission channel;
Each dedicated transmission channel is mapped to same down physical channel group.
Wherein, described down physical channel group comprises one or more physical channel, and is configured on a time slot or a plurality of complete time slot.
Compared with prior art, the present invention has following beneficial effect:
At first, the invention solves the downlink resource sharing problem of multicast service, for example to a PTT business, even a large amount of users is arranged in the sub-district, the present invention only needs to send a piece of data on eating dishes without rice or wine, and all users just can both receive, and therefore can save the frequency resource of eating dishes without rice or wine in large quantities.
Secondly, the present invention has also improved the cell capacity at PTT user, and the maximum multicast user's number supported in sub-district no longer is subjected to TD-SCDMA down physical channel maximum number quantitative limitation (and prior art maximum 48 down physical channels in uplink and downlink timeslot is configured to 3: 3 o'clock sub-districts).
Further, the descending multicast service of the present invention can take one or more complete time slots and realize, the corresponding up Random Access Channel RACH that then adopts realizes, can solve problems such as downlink power control like this, has also verified the feasibility of multicast channel design.
Further, because one group of physical channel of descending employing carries a large amount of listeners' business datum, the PTT number of users of same group calling can not be subjected to the restriction of downlink physical resource, does not almost have the upper limit in theory; And uply carrying up signaling with RACH, the PTT number of users of same like this group calling also can not be subjected to the restriction of ascending physical signal resource, does not also almost have the upper limit in theory.The number of users upper limit in the practical application only is subjected to the constraint of business model self.Improved the PTT user capacity of sub-district greatly.
Description of drawings
Fig. 1 is a kind of Traffic Channel mapping schematic diagram of prior art;
Fig. 2 is the Radio interface protocols system schematic that the present invention uses;
Fig. 3 is the downlink data transfer approach flow chart of multicast service of the present invention;
Fig. 4 is a kind of down channel mapping schematic diagram of multicast service downlink data transmission method of the present invention;
Fig. 5 is the another kind of down channel mapping schematic diagram of multicast service downlink data transmission method of the present invention;
Fig. 6 is that the physical layer that a kind of concrete channel Mapping disposes in the multicast service downlink data transmission method of the present invention realizes schematic diagram;
Fig. 7 is the composition schematic diagram of down transmission device of the present invention.
Embodiment
In order to make the clearer the present invention of understanding of those skilled in the art, the applied environment that at first the present invention is specifically related to simply is described below.
With reference to figure 2, this figure is the TD-SCDMA Radio interface protocols system schematic diagram that the present invention uses.
Aerial interface is meant the Uu interface between UE and the network among the present invention, is made up of L1, L2 and L3.L1 is based on TD-SCDMA technology, and L2 is identical with the UTRA tdd mode with L3.
As shown in Figure 2, physical layer connects medium access control (MAC) sublayer of L2 and RRM (RRC) sublayer of L3.Circle among the figure between different layers/sublayer is represented Service Access Point (SAPs).Physical layer provides different transmission channels to the MAC layer, and the transmission means of information on wave point determined the characteristic of transmission channel.The Radio Link of MAC course L2 control (RLC) sublayer provides different logic channels, the type decided of transmission information the characteristic of logic channel.Physical channel defines in physical layer, and a physical channel is determined jointly by sign indicating number, frequency and time slot.Physical layer is controlled by RRC, provides data transport service to high level, and the access of these services is to realize by the transmission channel that uses media access control sublayer to use.
With reference to figure 3, this figure is the flow chart of multicast service downlink data transmission method of the present invention.
Service surface to different user devices among the present invention is distributed one group of identical physical channel, and the physical channel configuration (comprising resources such as frequency, time slot, channel code) of different user is identical; The business datum of transmitting on this physical channel is received jointly by all users simultaneously.For this reason, at first in step 10, the default Dedicated Traffic Channel that will distribute to each subscriber equipment in the group is mapped to the mapping relations of same down physical channel group.During specific implementation, can adopt following mapping relations:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
Like this, in same sub-district,, will be mapped to finally by transmission channel that (one group of physical channel can comprise one or more physical channel on one group of identical physical channel though its service logical channels of a plurality of listeners of same PTT business is different.
Then, in step 11, when specifically transmitting the multicast service downlink data, the multi-cast business data that can broadcasting be sent to each subscriber equipment according to described default mapping relations is by described same down physical channel group carrying, and a multi-cast business data sends broadcasting to each subscriber equipment.
Be understood that, subscriber equipment for a plurality of reception business datums, owing to only need transmission one piece of data copy on down channel, and whether subscriber equipment does not need to distinguish its down physical channel yet and shares with many people, and all data that directly receive on this physical channel are just passable.Therefore, can improve the sharing degree of resource, satisfy the demand of multicast service by above scheme.
For the down channel of multicast service, the physical channel of final mapping can have multiple implementation method to select.Different implementation methods causes having on the ins and outs certain difference.Simpler with a kind of realization below, do not need the specific implementation of the participation of NodeB to describe yet.
With reference to figure 4, this figure is a kind of down channel mapping schematic diagram of multicast service downlink data transmission method of the present invention.
As shown in Figure 4, in channel Mapping, different listeners' service logical channels is mapped to earlier on the identical transmission channel, is mapped to one group of physical channel again.In other words, configuration of the transmission channel of different user devices and physical channel configuration are identical.And in the processing of data flow, because all users' downlink service data is identical, so that the transmission channel entity only need be handled a downstream data flow is just passable.
With reference to figure 5, this figure is a kind of down channel mapping schematic diagram of multicast service downlink data transmission method of the present invention.
As shown in Figure 5, in channel Mapping, different listeners' service logical channels is mapped to earlier on the corresponding separately transmission channel, and each transmission channel is mapped to same group of physical channel again.Adopt such channel Mapping, the physical channel configuration of different user devices is identical, owing to by same physical channel carrying, therefore, can save interface-free resources equally.
In addition, from prior art as can be known, the physical channel under the tdd mode is a burst, the particular time-slot emission in the radio frames that is assigned to.The distribution of radio frames can be continuous, and promptly the corresponding time slot of each frame can be distributed to certain physics channel, also can be discontinuous distribution, promptly only has the corresponding time slot in the part radio frames to distribute to this physical channel.For the specific implementation of physical channel, the down physical channel of a multicast service can take one or more complete descending time slots among the present invention.Divide owing on a time slot, no longer carry out sign indicating number,, also just can carry out full power transmissions, do not need descending power to control at the down channel of this time slot so descending do not have an inter-user interference.The up like this Dedicated Control Channel that also just do not need sends measurement report, can adopt RACH to carry, and all mobile phones send upstream control signaling by the mode that inserts at random.
Fig. 6 is that the physical layer that a kind of concrete channel Mapping disposes realizes schematic diagram.
As shown, adopt the down channel of a complete descending time slot TS4 as multicast, up channel can adopt ascending time slot TS1 to transmit, for the TS4 time slot, do not distinguish user's (promptly the downlink data of this time slot transmission is not distinguished and received the user) owing to need not carry out code word, therefore, realize, can carry out full power transmissions based on this physical layer.
The following describes another aspect of the present invention.
With reference to figure 7, this figure is that down transmission device of the present invention is formed schematic diagram.
As shown in Figure 7, down transmission device comprises among the present invention: mapping inking device 20 and conveyer 21.
As above-mentioned, during specific implementation, can adopt following mapping relations:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
Also can adopt another kind of mapping relations:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to corresponding each dedicated transmission channel;
Each dedicated transmission channel is mapped to same down physical channel group.
Need to prove that above-mentioned mapping relations are not unique, can carry out corresponding mapping configuration, repeat no more here according to the demand of actual treatment business.
In the specific implementation, preferred, described down physical channel group comprises one or more physical channel, and is configured on a time slot or a plurality of time slot.
To sum up, the core of multicast service downlink data transmission method of the present invention and device is to participate at same sub-district all recipients of same multicast service, by improving the down channel mapping mode, make all recipients of multicast service fully carry out resource-sharing, reach the purpose of saving eat dishes without rice or wine frequency resource and raising downlink capacity.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1, a kind of multicast service downlink data transmission method is applied to it is characterized in that in the tdd CDMA system, comprising:
The default Dedicated Traffic Channel that will distribute to each subscriber equipment in the group is mapped to the mapping relations of same down physical channel group;
The multi-cast business data that will be broadcast to subscriber equipment in the group according to described default mapping relations is by described same down physical channel group carrying, and a multi-cast business data is broadcast to corresponding each subscriber equipment.
2, multicast service downlink data transmission method according to claim 1 is characterized in that, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
3, multicast service downlink data transmission method according to claim 1 is characterized in that, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to corresponding each dedicated transmission channel;
Each dedicated transmission channel is mapped to same down physical channel group.
4, according to claim 1,2 or 3 each described multicast service downlink data transmission methods, it is characterized in that described down physical channel group comprises one or more physical channel, and be configured on a time slot or a plurality of complete time slot.
5, a kind of down transmission device is applied to it is characterized in that in the tdd CDMA system, comprising:
The mapping inking device, the mapping relations that are used for being mapped to according to the default Dedicated Traffic Channel that will distribute to each subscriber equipment in the group same down physical channel group are carried out corresponding mapping configuration;
Conveyer is used for the multi-cast business data that mapping relations according to described configuration will be broadcast to subscriber equipment in the group and carries by described same down physical channel group, and a multi-cast business data is broadcast to corresponding each subscriber equipment.
6, down transmission device according to claim 5 is characterized in that, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to same dedicated transmission channel;
Described dedicated transmission channel is mapped to same down physical channel group.
7, down transmission device according to claim 5 is characterized in that, described mapping relations comprise:
The Dedicated Traffic Channel of distributing to each subscriber equipment is mapped to corresponding each dedicated transmission channel;
Each dedicated transmission channel is mapped to same down physical channel group.
8, according to claim 5,6 or 7 each described down transmission device, it is characterized in that described down physical channel group comprises one or more physical channel, and be configured on a time slot or a plurality of complete time slot.
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| CNB2004100584305A CN100353772C (en) | 2004-08-11 | 2004-08-11 | Multicast service subline data transmission method and device |
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| CNB2004100584305A CN100353772C (en) | 2004-08-11 | 2004-08-11 | Multicast service subline data transmission method and device |
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| CN100353772C true CN100353772C (en) | 2007-12-05 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8014331B2 (en) | 2006-07-28 | 2011-09-06 | Qualcomm Incorporated | Method and apparatus for using a MAC protocol for broadcast |
| CN100583775C (en) * | 2006-12-21 | 2010-01-20 | 中兴通讯股份有限公司 | Method of configuring broadcast multicast system channel and broadcasting program stream |
| CN101034964B (en) * | 2007-04-16 | 2011-04-06 | 华为技术有限公司 | Downlink data transmission method, system and base station |
| CN101426239B (en) * | 2007-10-31 | 2011-04-06 | 华为技术有限公司 | Service transmission method, apparatus and system in carrier switching process |
| CN101998654B (en) * | 2009-08-17 | 2013-04-03 | 电信科学技术研究院 | Static service and dynamic service space division multiplexing method, system and device |
| CN111836205B (en) * | 2019-04-15 | 2022-05-17 | 海能达通信股份有限公司 | Multicast service implementation method based on cluster communication and related equipment |
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| CN1362845A (en) * | 2000-12-29 | 2002-08-07 | Lg电子株式会社 | Wireless interface agreement set-up method for registering subscriber apparatus in ground wireless cut-in network |
| US20020150072A1 (en) * | 2000-11-10 | 2002-10-17 | Harri Honksasalo | Mapping of internet protocol based data |
| US20040013096A1 (en) * | 2002-07-19 | 2004-01-22 | Interdigital Technology Corporation | Dynamic forward error correction in utra systems |
| CN1503583A (en) * | 2002-11-22 | 2004-06-09 | Lg������ʽ���� | Data transmission in mobile communication |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020150072A1 (en) * | 2000-11-10 | 2002-10-17 | Harri Honksasalo | Mapping of internet protocol based data |
| CN1362845A (en) * | 2000-12-29 | 2002-08-07 | Lg电子株式会社 | Wireless interface agreement set-up method for registering subscriber apparatus in ground wireless cut-in network |
| US20040013096A1 (en) * | 2002-07-19 | 2004-01-22 | Interdigital Technology Corporation | Dynamic forward error correction in utra systems |
| CN1503583A (en) * | 2002-11-22 | 2004-06-09 | Lg������ʽ���� | Data transmission in mobile communication |
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