CN101431718A - Multimedia broadcast/multicast service special carrier frequency cell networking method and system - Google Patents
Multimedia broadcast/multicast service special carrier frequency cell networking method and system Download PDFInfo
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- CN101431718A CN101431718A CNA2007101696284A CN200710169628A CN101431718A CN 101431718 A CN101431718 A CN 101431718A CN A2007101696284 A CNA2007101696284 A CN A2007101696284A CN 200710169628 A CN200710169628 A CN 200710169628A CN 101431718 A CN101431718 A CN 101431718A
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Abstract
The invention discloses a method and a system for network deployment in multimedia broadcast/multi-spot transport service designated carrier frequency cells, and relates to a wireless communication technique. The inventive method comprises the steps of: first defining a plurality of fundamental lead code pairs and corresponding scrambling codes, each fundamental lead code pair and the corresponding scrambling codes are different than each other; then configuring a code pair different than the fundamental lead codes configured in adjacent cells for each multimedia broadcast/multi-spot transport service designated carrier frequency cell, afterwards, sending the fundamental lead codes in the fundamental lead code pairs and data subjected to scrambling according to the scrambling codes over a special time slot of wireless sub-frames of the cell. The invention also discloses a multimedia broadcast/multi-spot transport service system comprising a plurality of multimedia broadcast/multi-spot transport service designated carrier frequency cells, and avoids interference between adjacent cells resulted from usage of fixed MS time slot fundamental preamble pair, which provides the user terminal with functions of downlink synchronization and cell searching.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to multimedia broadcasting/multicast services MBMS (Multimedia Broadcast/Multicast Service) special carrier frequency cell networking method and system.
Background technology
People no longer are satisfied with phone and messaging service to the demand of mobile communication now, and along with the fast development of Internet net, a large amount of multimedia services emerge.The some of them applied business, a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.The MBMS technology utilizes mobile network resource to propose for realizing most effectively, refers to that a data source sends the point-to-multipoint service of data to a plurality of users, realizes that Internet resources share, and comprises that mobile core network and access network resource share, especially interface-free resources.The MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can realize the multimedia service multicast and the broadcasting of two-forty, and this has complied with the trend of following mobile data development undoubtedly.
Variation has taken place in the protocol stack of user's face behind the 3GPP introducing MBMS, RNC can tabulate according to core net service area SA when the MBMS service carrier is set up, be made into the cell set mode with affiliated cell set and set up shared PDCP PDCP (Packet Data ConvergenceProtocol) in a plurality of sub-districts and Radio Link control RLC (Radio Link Control) entity, media access control MAC-m (Medium Access Control for MBMS) and the Frame Protocol FP separately (Frame Protocol) of MBMS separately used in each sub-district.
Fig. 1 shows the TDS-CDMA mobile communication TD-SCDMA MBMS of system special carrier frequency wireless frame structure.When carrier wave was 1.28M, a subframe was 5ms (millisecond), contains 6400 chip (chip).A subframe has seven business time-slots (being numbered 0～6) and two SwitchingPoint (exchange point); being numbered 0 time slot is descending time slot; thereafter following the UpPTS (uplink pilot time slot) of the DwPTS (descending pilot frequency time slot) of 96 chips, 106 chips, is GP (main protection time slot) between descending pilot frequency time slot and uplink pilot time slot.Descending pilot frequency time slot, uplink pilot time slot and main protection time slot constitute first exchange point jointly.Being numbered 1～3 time slot is ascending time slot, and being numbered 4～6 time slot is descending time slot.Being numbered 3 and be numbered between two time slots of 4, be another exchange point.
As a kind of network-building method of MBMS business, industry has proposed the MBMS special carrier frequency, and its wireless frame structure and structure of time slot are as shown in Figure 2.Contrast Fig. 1 and Fig. 2, the MBMS special carrier frequency cell of so-called TD-SCDMA is meant that all business time-slots in existing TD-SCDMA sub-district all are used to send descending MBMS business, have cancelled original ascending time slot as can be seen.Simultaneously; original 3 special time slot (uplink pilot time slots in the TD-SCDMA system wireless frame; descending pilot frequency time slot, and the protection time slot in the middle of these two) merge into a special MBMS signalling time slot, this time slot is called MS time slot (MBMS Special time slot).This time slot is used to carry the system message of TD-SCDMA sub-district, MBMS control messages (MSCH message just), and business time-slot in addition is called MT time slot (MBMS Transmit time slot).In addition, the intermediate code midamble in the former TD-SCDMA system time gap structure changes lead code preamble into, and just midamble code is placed on the foremost of a time slot, rather than present centre position.
Simultaneously, in order to satisfy the demand of the independent networking of MBMS special carrier frequency, the MBMS special carrier frequency cell need provide the function of Cell searching and down-going synchronous.
In original TD-SCDMA system, descending synchronous code, the corresponding relation of basic midamble sign indicating number and scrambler is as follows: 1, a descending synchronous code is used in a sub-district.2, corresponding 4 groups of basic midamble of descending synchronous code and scrambler are right.3, basic midamble sign indicating number and scrambler are corresponding one by one, and one group of basic midamble and scrambler are used in a sub-district
User terminal UE realizes Cell searching and down-going synchronous by following step: 1, UE searching downlink pilot frequency slot, detect downlink frequency pilot code, and by this step, UE can obtain the sequence number of down-going synchronous time and downlink frequency pilot code.2, UE detects the midamble sign indicating number of time slot 0, obtains basic midamble sequence by coupling, by the definition of TD-SCDMA agreement, and the corresponding scrambler of basic midamble, UE hence one can see that scrambler that the sub-district uses.3, UE detects the phase difference through the midamble sign indicating number of the relative time slot 0 of down-bound pilot frequency signal of QPSK modulation, detect the change sequence of specific phase difference after, obtain the position that physics master control channel PCCPCH begins.
And in the new MBMS special carrier frequency system that proposes, there has not been above-mentioned downlink pilot frequency channel, but a kind of method of new Cell searching has been proposed, this method is summarized as follows: 1, the MS time slot preamble sign indicating number of all sub-districts adopts two fixing basic preamble sign indicating number sequences, is called PP0 and PP1.2, UE obtains the down-going synchronous temporal information by detecting PP0 or the PP1 sequence in the radio frames, realizes down-going synchronous.3, UE is detecting the PP0 sequence, then continue to detect the MS time slot preamble sign indicating number of next wireless sub-frame, if when detecting the PP1 sequence, next wireless sub-frame is the starting position of PCCPCH, otherwise continuation detects the MS time slot preamble sign indicating number of next wireless sub-frame.4, the corresponding relation of basic preamble sign indicating number and scrambler provides definition in agreement, and is to concern one to one, the scrambler of sub-district use that hence one can see that.
The problem that said method exists is, because the MS time slot of each sub-district is all fixed use PP0 and the basic preamble sign indicating number of PP1, and the mapping relations of preamble and scrambler are mapping one by one, and like this, the MS time slot of each sub-district all will use identical scrambler.And the MS time slot all uses identical scrambler can bring serious co-channel interference on the identical frequency of neighbor cell, and which sub-district UE has no idea to distinguish wireless signal from, causes the failure of down-going synchronous and Cell searching.If neighbor cell adopts the MS time slot transmitting system message of different frequencies, can not get rid of the interference that the MS time slot signal that adopts identical frequency transmitting system message and MSCH message on the non-adjacent sub-district brings for this sub-district.
And the problems referred to above mainly are present in following two kinds of neighbor cell situations: 1, the neighbor cell geographical position is adjacent; 2, the neighbor cell geographical position is overlapping, and frequency is neighbouring relations.
Summary of the invention
Technical problem to be solved by this invention is MBMS special carrier frequency cell networking method and system to be provided, thereby to have avoided owing to adopt the fixedly problem of the basic preamble of MS time slot to interfering with each other between the neighbor cell that is brought.
In order to solve the problems of the technologies described above, the invention discloses a kind of multimedia broadcasting/multicast service special carrier frequency cell networking method, at first define some to basic lead codes to and corresponding scrambler, every pair of basic lead codes is different to pairing scrambler; To be adjacent the basic lead codes of cell configuration right to different sign indicating numbers for 1 of the network equipment of each multimedia broadcasting/multicast service special carrier frequency cell configuration then, sends the basic lead codes of described basic lead codes centering afterwards on the special time slot of the wireless sub-frame of this sub-district and press the data of scrambler scrambling processing.
Above-mentioned network equipment sends a basic lead codes of institute's configuration code centering on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes of the sign indicating number centering of described configuration on the special time slot of other wireless sub-frame.
Further, in the said method, the leading substantially lead code of described definition is to being used for the business time-slot on special time slot and the multimedia broadcasting/multicast service special carrier frequency simultaneously.
Further, in the said method, the basic lead codes of described configuration is to corresponding scrambler, described network equipment is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the described sign indicating number that on special time slot, disposes that pairing scrambler is carried out scrambling, on special time slot, send then; Perhaps
The corresponding scrambler of each basic lead codes of the basic lead codes centering of described configuration, described network equipment is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of the described basic lead codes that on the MS time slot, disposes to carry out scrambling, on special time slot, send then.
Further, in the said method, described neighbor cell is the adjacent sub-district of frequency, and this sub-district comprises sub-district and the geographical position adjacent sub-district of overlapping frequency that the geographical position is adjacent.
Further, said method is used for TD-SCDMA multimedia broadcasting/multicast service special carrier frequency cell networking process.
The invention also discloses a kind of multimedia broadcasting/multicast services system that comprises a plurality of multimedia broadcasting/multicast service special carrier frequency cells, wherein the network equipment of each multimedia broadcasting/multicast service special carrier frequency cell comprises:
Configuration module, it is right to different sign indicating numbers to be used to dispose 1 basic lead codes that is adjacent cell configuration, and wherein every pair of basic lead codes is different to pairing scrambler;
Sending module is used for sending the basic lead codes of the basic lead codes centering of being disposed and the data of handling by the scrambler scrambling on the special time slot MS time slot of the wireless sub-frame of this sub-district.
Further, in the said system, described sending module sends a basic lead codes of institute's configuration code centering on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes of the sign indicating number centering of described configuration on the special time slot of other wireless sub-frame.
Further, in the said system, the business time-slot of described sending module on special time slot and multimedia broadcasting/multicast service special carrier frequency can use the leading substantially lead code of described definition right simultaneously.
Further, in the said system, the basic lead codes of described configuration module configuration is to corresponding scrambler, described sending module is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the described sign indicating number that on special time slot, disposes that pairing scrambler is carried out scrambling, on special time slot, send then; Perhaps
During scrambler of each basic lead codes correspondence of the basic lead codes centering of described configuration module configuration, described sending module is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of the described basic lead codes that on special time slot, disposes to carry out scrambling, on special time slot, send then.
Further, in the said system, described neighbor cell is the adjacent sub-district of frequency, and this sub-district comprises sub-district and the geographical position adjacent sub-district of overlapping frequency that the geographical position is adjacent.
Further, said system is applied to TDS-CDMA mobile communication system multimedia broadcasting/multicast service special carrier frequency cell networking process.
The present invention has following beneficial effect:
Behind the MBMS special carrier frequency cell networking, avoided providing the function of down-going synchronous and Cell searching for user terminal UE owing to adopt the fixedly problem of the basic preamble of MS time slot to interfering with each other between the neighbor cell that is brought.
Description of drawings
Fig. 1 is a TD-SCDMA system wireless frame structure schematic diagram;
Fig. 2 is the MBMS of a TD-SCDMA system special carrier frequency structure of time slot schematic diagram;
The schematic diagram of Fig. 3 for adopting technical solution of the present invention to carry out the networking of MBMS special carrier frequency;
Fig. 4 realizes the frame structure schematic diagram that down-going synchronous adopted for adopting technical solution of the present invention.
Embodiment
Main design of the present invention is, in TD-SCDMA MBMS special carrier frequency cell networking process, according to existing basic preamble sign indicating number to (basic preamble pair), it is some right to basic preamble sign indicating number to define, and comprises first yard P0 and second sign indicating number P1 in every pair of basic preamble sign indicating number.Like this in neighbor cell, just can consider on the MS time slot, to select for use different basic preamble sign indicating numbers right, avoid interfering with each other of neighbor cell thus, simultaneously, in order to realize down-going synchronous at user terminal, can on the MS time slot of the previous wireless sub-frame of PCCPCH place subframe, send a basic preamble sign indicating number of the sign indicating number centering that has been configured, and on the MS of other wireless sub-frame time slot, send another basic preamble sign indicating number of the sign indicating number centering of described configuration.
Wherein, the basic preamble sign indicating number of above-mentioned definition also can be used for other business time-slot on the MBMS special carrier frequency to both being used for MS time slot on the described MBMS special carrier frequency.
Below in conjunction with the drawings and specific embodiments, the technical solution adopted in the present invention is described in further detail.
A kind of MBMS system is applied to TD-SCDMA MBMS special carrier frequency cell networking process, and this system comprises a plurality of MBMS special carrier frequency cells and a plurality of network equipment.
The network equipment of each MBMS special carrier frequency cell comprises:
Configuration module, it is right to different sign indicating numbers to be used to dispose 1 basic preamble sign indicating number that is adjacent cell configuration, wherein every pair of basic preamble sign indicating number is to corresponding scrambler, perhaps every pair of each basic preamble sign indicating number of sign indicating number centering is distinguished corresponding scrambler, and every pair of basic preamble sign indicating number is different to pairing scrambler; When the basic preamble sign indicating number of above-mentioned configuration module configuration to corresponding scrambler, sending module is to the data division of MBMS special carrier frequency cell MS time slot, adopt the described sign indicating number that on the MS time slot, disposes that pairing scrambler is carried out scrambling, on the MS time slot, send then; When the corresponding scrambler of each basic preamble sign indicating number of basic preamble sign indicating number centering of configuration module configuration, sending module is to the data division of MBMS special carrier frequency cell MS time slot, adopt the described pairing scrambler of basic preamble sign indicating number that on the MS time slot, disposes to carry out scrambling, on the MS time slot, send then.Wherein basic preamble sign indicating number perhaps is used for other business time-slot on MS time slot and the MBMS special carrier frequency to being used for the MS time slot, and described neighbor cell is the adjacent sub-district of frequency, comprises sub-district and the geographical position adjacent sub-district of overlapping frequency that the geographical position is adjacent;
Sending module, be used on the special time slot MS time slot of the wireless sub-frame of this sub-district, sending the basic preamble sign indicating number of the basic preamble sign indicating number centering of being disposed and the data of handling by the scrambler scrambling, wherein sending module sends a basic preamble sign indicating number of institute's configuration code centering on the MS time slot of the previous wireless sub-frame of PCCPCH place subframe of physics master control channel, send another basic preamble sign indicating number of the sign indicating number centering of described configuration on the MS of other wireless sub-frame time slot, wherein the business time-slot of sending module on MS time slot and MBMS special carrier frequency can use basic preamble sign indicating number right simultaneously.
Said system may further comprise the steps at the method for MBMS special carrier frequency cell networking:
In this step, the basic preamble sign indicating number of definition also can be used for other business time-slot on the MBMS special carrier frequency to both being used for MS time slot on the described MBMS special carrier frequency.When being used for other business time-slot on the MBMS special carrier frequency simultaneously, can judge the position (MS time slot duration is different with other business time-slot) of MS time slot according to the basic preamble code interval that detects.The used basic preamble sign indicating number of other business time-slot to the MS time slot not simultaneously, just can be directly according to detected basic preamble sign indicating number to determining the position of MS time slot.
In this step, described neighbor cell comprises that the neighbor cell in geographical position and geographical position are overlapping, the neighbor cell that its frequency is adjacent.
When two right preamble sign indicating numbers of basic preamble sign indicating number are distinguished scrambler of correspondence, in the above-mentioned steps 4, MBMS special carrier frequency cell network equipment adopts a scrambler data division of MS time slot to be carried out sending after the scrambling the basic preamble sign indicating number that this scrambler is adopted corresponding to this MS time slot at the MS time slot.That is to say that a MBMS special carrier frequency cell adopts different scrambler data portion to carry out scrambling and handles in the difference of MS time slot according to its employed basic preamble sign indicating number.
Concrete an application in the example, the method for employing may further comprise the steps:
Steps A, the definition 16 pairs of basic preamble sign indicating numbers right, its concrete corresponding relation is as shown in table 1, every pair of basic preamble sign indicating number is to corresponding scrambler, as basic preamble sign indicating number sequence number 1 is comprised two basic preamble sign indicating numbers, PP00 and PP01, be respectively this first yard P0 and second sign indicating number P1 right to sign indicating number, this yard is 1 scrambler to a corresponding sequence number also.The basic preamble sign indicating number of all yards centering is all inequality.
Table 1: basic preamble sign indicating number-scrambler
| Basic Preamble sign indicating number is to sequence number | P0 | P1 | The |
| 1 | PP00 | PP01 | 1 |
| 2 | PP02 | PP03 | 2 |
| 3 | PP04 | PP05 | 3 |
| 4 | PP06 | PP07 | 4 |
| 5 | PP08 | PP09 | 5 |
| 6 | PP10 | PP11 | 6 |
| 7 | PP12 | PP13 | 7 |
| 8 | PP14 | PP15 | 8 |
| 9 | PP16 | PP17 | 9 |
| 10 | PP18 | PP19 | 10 |
| 11 | PP20 | PP21 | 11 |
| 12 | PP22 | PP23 | 12 |
| 13 | PP24 | PP25 | 13 |
| 14 | PP26 | PP27 | 14 |
| 15 | PP28 | PP29 | 15 |
| 16 | PP30 | PP31 | 16 |
Step B, by shown in Figure 3 TD-SCDMA MBMS special carrier frequency cell is carried out networking, wherein the sequence number of P is represented the right sequence number of basic preamble sign indicating number that it is selected for use, and the MS time slot of its main carrier frequency of neighbor cell adopts different basic preamble sign indicating numbers right.
Step C, in this example, with sub-district Cell 1 is example, its basic preamble sign indicating number that uses is right to the sign indicating number as sequence number 1, previous subframe at PCCPCH channel head, the employing sequence number is second right sign indicating number PP01 of basic preamble sign indicating number of 1, as the basic preamble sign indicating number of this subframe MS time slot, in other subframe, adopting sequence number is the basic preamble sign indicating number of right first yard PP00 of 1 basic preamble sign indicating number as the MS time slot, as shown in Figure 4.
Step D, sub-district Cell 1 be at its MS time slot, and adopting sequence number is that 1 scrambler data portion is carried out scrambling and handled the back and send.
From the foregoing description as can be seen, adopt technical solution of the present invention, adopt different scramblers to send between the neighbor cell at the MBMS special carrier frequency cell networking.Thereby avoided providing the function of down-going synchronous and Cell searching for user terminal UE owing to adopt the fixedly problem of the basic preamble of MS time slot to interfering with each other between the neighbor cell that is brought.
Above-mentioned embodiment only is for the convenient preferred embodiment that provides of the present invention being provided, can not being interpreted as qualification the present invention, therefore by all technical schemes that claim of the present invention covered all at the row of prescription of the present invention.
Claims (12)
1, a kind of multimedia broadcasting/multicast service special carrier frequency cell networking method is characterized in that, this method at first define some to basic lead codes to and corresponding scrambler, every pair of basic lead codes is different to pairing scrambler; To be adjacent the basic lead codes of cell configuration right to different sign indicating numbers for 1 of the network equipment of each multimedia broadcasting/multicast service special carrier frequency cell configuration then, sends the basic lead codes of described basic lead codes centering afterwards on the special time slot of the wireless sub-frame of this sub-district and press the data of scrambler scrambling processing.
2, the method for claim 1 is characterized in that:
Described network equipment sends a basic lead codes of institute's configuration code centering on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes of the sign indicating number centering of described configuration on the special time slot of other wireless sub-frame.
3, method as claimed in claim 1 or 2 is characterized in that:
Substantially the leading lead code of described definition is to being used for the business time-slot on special time slot and the multimedia broadcasting/multicast service special carrier frequency simultaneously.
4, method as claimed in claim 1 or 2 is characterized in that:
The basic lead codes of described configuration is to corresponding scrambler, described network equipment is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the described sign indicating number that on special time slot, disposes that pairing scrambler is carried out scrambling, on special time slot, send then; Perhaps
The corresponding scrambler of each basic lead codes of the basic lead codes centering of described configuration, described network equipment is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of the described basic lead codes that on the MS time slot, disposes to carry out scrambling, on special time slot, send then.
5, the method for claim 1 is characterized in that, described neighbor cell is the adjacent sub-district of frequency, and this sub-district comprises sub-district and the geographical position adjacent sub-district of overlapping frequency that the geographical position is adjacent.
6, the method for claim 1 is characterized in that, this method is used for TD-SCDMA multimedia broadcasting/multicast service special carrier frequency cell networking process.
7, a kind of multimedia broadcasting/multicast services system that comprises a plurality of multimedia broadcasting/multicast service special carrier frequency cells, it is characterized in that: the network equipment of each multimedia broadcasting/multicast service special carrier frequency cell comprises:
Configuration module, it is right to different sign indicating numbers to be used to dispose 1 basic lead codes that is adjacent cell configuration, and wherein every pair of basic lead codes is different to pairing scrambler;
Sending module is used for sending the basic lead codes of the basic lead codes centering of being disposed and the data of handling by the scrambler scrambling on the special time slot MS time slot of the wireless sub-frame of this sub-district.
8, system as claimed in claim 7 is characterized in that:
Described sending module sends a basic lead codes of institute's configuration code centering on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes of the sign indicating number centering of described configuration on the special time slot of other wireless sub-frame.
9, system as claimed in claim 7 is characterized in that:
The business time-slot of described sending module on special time slot and multimedia broadcasting/multicast service special carrier frequency can use the leading substantially lead code of described definition right simultaneously.
10, as claim 7 or 8 described systems, it is characterized in that:
The basic lead codes of described configuration module configuration is to corresponding scrambler, described sending module is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the described sign indicating number that on special time slot, disposes that pairing scrambler is carried out scrambling, on special time slot, send then; Perhaps
During scrambler of each basic lead codes correspondence of the basic lead codes centering of described configuration module configuration, described sending module is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of the described basic lead codes that on special time slot, disposes to carry out scrambling, on special time slot, send then.
11, system as claimed in claim 7 is characterized in that, described neighbor cell is the adjacent sub-district of frequency, and this sub-district comprises sub-district and the geographical position adjacent sub-district of overlapping frequency that the geographical position is adjacent.
12, system as claimed in claim 7 is characterized in that, this system applies is in TDS-CDMA mobile communication system multimedia broadcasting/multicast service special carrier frequency cell networking process.
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