CN101431716A - Cell search method of multimedia broadcast/multicast service special carrier frequency - Google Patents
Cell search method of multimedia broadcast/multicast service special carrier frequency Download PDFInfo
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- CN101431716A CN101431716A CNA2007101655551A CN200710165555A CN101431716A CN 101431716 A CN101431716 A CN 101431716A CN A2007101655551 A CNA2007101655551 A CN A2007101655551A CN 200710165555 A CN200710165555 A CN 200710165555A CN 101431716 A CN101431716 A CN 101431716A
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Abstract
The invention discloses a cell searching method of multimedia broadcast/multi-spot transport service designated carrier frequency, directing to avoid co-channel interference or intra-channel interference resulted from the usage of the same scrambling codes by adjacent cells MS time slot, the method comprises the steps of: configuring, at user terminals and network sides, contracted fundamental lead code pair designated for multimedia broadcast/multi-spot transport service special time slot, and associated relationship thereof with the scrambling codes, wherein the fundamental lead code pair designated for the special time slot is different than the fundamental lead code pair designated for other service time slots; matching the fundamental lead codes of the special time slot by the user terminal in the process of cell searching, and determining the scrambling codes corresponding to the matched fundamental lead codes after matching the fundamental lead codes, descrambling data portions of the special time slot according to the scrambling codes. The invention, without co-channel or intra-channel interference, realizes downlink synchronization of the user terminal and cell searching at the MBMS designated carrier frequency cell of a TD-SCDMA system.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to the small region search method of a kind of MBMS (Multimedia Broadcast/Multicast Service, multimedia broadcasting/multicast services) special carrier frequency.
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 Intemet, 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.
After 3GPP introduces MBMS, variation has taken place in the protocol stack of user's face, RNC (radio network controller) is when the MBMS service carrier is set up, can tabulate according to core net SA (service area), be made into the cell set mode with affiliated cell set and set up shared PDCP (the Packet DataConvergence Protocol in a plurality of sub-districts, PDCP) and RLC (Radio Link Control, Radio Link control) entity, MAC-m (Medium Access ControlforMBMS is separately used in each sub-district, the medium access control of MBMS) and FP separately (Frame Protocol, Frame Protocol).
Fig. 1 shows TD-SCDMA system non-MBMS special carrier frequency wireless sub-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 Switching Point (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 sub-frame structure 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 TD-SCDMA sub-district all are used to send descending MBMS business, has cancelled original ascending time slot (being numbered 1,2 and 3 time slot).Simultaneously; original 3 special time slot (uplink pilot time slots in the TD-SCDMA system wireless subframe; 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 (MBMS Special) time slot (MBMS is special).This MS 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 (time slot of numbering 0～7) is called MT (MBMS Transmit, MBMS transmission) time slot.Also have, midamble (intermediate code) in the former TD-SCDMA system time gap structure changes preamble (lead code) (96 chips) into, just midamble code is placed on the foremost of a time slot, be positioned at DataSymbol (data symbol) (768 chips) before, rather than present centre position, the structure of time slot of MBMS special carrier frequency as shown in Figure 3.
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, the corresponding relation of descending synchronous code, basic midamble sign indicating number and scrambler is as follows:
A descending synchronous code is used in (1) sub-district;
Corresponding 4 groups of basic midamble of (2) descending synchronous codes 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.
With reference to Fig. 4, UE (user terminal) realizes Cell searching and down-going synchronous by following step:
And in the new MBMS special carrier frequency system that proposes, owing to there has not been above-mentioned downlink pilot frequency channel, therefore a kind of method of new Cell searching has been proposed, this method comprises step as shown in Figure 5:
Above-mentioned method as shown in Figure 5, the problem below existing:
Use PP0 and the basic preamble sign indicating number of PP1 because the MS time slot of each sub-district is all fixed, and the mapping relations of preamble and scrambler are for one to one, like this, the MS time slot of each sub-district all will use identical scrambler.And neighbor cell MS time slot all uses identical scrambler can bring interference between serious co-channel interference or frequency, and which sub-district UE has no idea to distinguish wireless signal from, causes the failure of down-going synchronous and Cell searching.Described MBMS special carrier frequency neighbor cell comprises following two kinds of situations:
(1) geographical position is the sub-district of neighbouring relations.
(2) geographical position is identical or overlapping, and its frequency is the sub-district of neighbouring relations.
Summary of the invention
Technical problem to be solved by this invention is the small region search method that is to provide a kind of multimedia broadcasting/multicast service special carrier frequency, avoids neighbor cell MS time slot to use between identical co-channel interference that scrambler brought or frequency and disturbs.
In order to solve the problems of the technologies described above, the invention provides a kind of small region search method of multimedia broadcasting/multicast service special carrier frequency:
The basic lead codes that is exclusively used in multimedia broadcasting/multicast services special time slot of user terminal and network side configuration agreement to and with the incidence relation of scrambler, the basic lead codes that wherein is exclusively used in special time slot is right to being different from the basic lead codes that is used for other business time-slots;
Described user terminal is in cell search process, basic lead codes to described special time slot is mated, after matching basic lead codes, determine and the corresponding scrambler of basic lead codes that matches, the data division of described special time slot is carried out descrambling according to described scrambler.
In the small region search method of above-mentioned multimedia broadcasting/multicast service special carrier frequency, described user terminal and network side can arrange some to the basic lead codes that is exclusively used in special time slot to and corresponding scrambler, every pair of basic lead codes is different to pairing scrambler;
For basic lead codes that is adjacent cell configuration of multimedia broadcasting/multicast service special carrier frequency cell configuration is right to different basic lead codes, on the special time slot of the wireless sub-frame of this sub-district, send the basic lead codes of the basic lead codes centering of being disposed then.
Further, the basic lead codes of described configuration is to can corresponding scrambler, described network side is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt described basic lead codes of on special time slot, arranging that pairing scrambler is carried out scrambling, on special time slot, send then.
And, each basic lead codes of basic lead codes centering of described configuration can corresponding scrambler, described network side is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of described basic lead codes of on special time slot, arranging to carry out scrambling, on special time slot, send then.
And described neighbor cell can be the adjacent sub-district of frequency, comprises the sub-district that the geographical position is adjacent and the geographical position is overlapping, its frequency is the sub-district of neighbouring relations.
In the small region search method of above-mentioned multimedia broadcasting/multicast service special carrier frequency, described network side can send a basic lead codes P0 of the sign indicating number centering of being disposed on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes P1 of the sign indicating number centering of being disposed on the special time slot of other wireless sub-frame.
Further, the basic lead codes of the detected special time slot of described user terminal is described P0, then can continue to detect the basic lead codes of next wireless sub-frame special time slot, P1 as described in as the basic lead codes of detected special time slot being, can determine that then next wireless sub-frame is the beginning of the physics master control channel of special time slot carrying, finishes Cell searching.
Compared with prior art, the present invention has realized the down-going synchronous and the Cell searching of user terminal intrusively between the MBMS of TD-SCDMA system special carrier frequency cell does not have with frequency or frequency.
Description of drawings
Fig. 1 is a TD-SCDMA system non-MBMS special carrier frequency wireless sub-frame structure.
Fig. 2 is the MBMS of a TD-SCDMA system special carrier frequency wireless sub-frame structure.
Fig. 3 is the MBMS of a TD-SCDMA system special carrier frequency structure of time slot.
Fig. 4 is the flow process that realizes Cell searching and down-going synchronous in the TD-SCDMA system.
Fig. 5 is the flow process that does not have the TD-SCDMA system realization Cell searching of downlink pilot frequency channel.
Fig. 6 is the step schematic diagram of the inventive method embodiment.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.
A kind of improved method can solve the problem that above-mentioned method is brought, and its improvement is as follows:
(1) system arranges the adoptable basic preamble of all MBMS special carrier frequency cell MS time slots to (basic preamble pair), and to define basic preamble sign indicating number (can be that a sign indicating number is to corresponding with a scrambler to the corresponding relation with scrambler, each basic preamble sign indicating number that also can be a sign indicating number centering is corresponding with a scrambler respectively), the network equipment of MBMS special carrier frequency cell selects for use a pair of basic preamble sign indicating number right as the basic preamble sign indicating number of its MS time slot, and the basic preamble sign indicating number that agreement MS time slot uses is not used in the MT time slot.
(2) the basic preamble sign indicating number of MBMS special carrier frequency cell MS time slot employing is right, and the sign indicating number that adjacent MBMS special carrier frequency cell MS time slot with it adopts is to different in twos.
(3) network equipment is at the previous wireless sub-frame of the subframe of PCCPCH channel head, its MS time slot uses the sign indicating number that is adopted to the basic preamble sign indicating number of second sign indicating number (or first sign indicating number) as the MS time slot, at other wireless sub-frame, use its yard first right sign indicating number that adopts (if the MS time slot adopts first sign indicating number, then adopt second sign indicating number herein) as the basic preamble sign indicating number of MS time slot, and use the corresponding scrambler of basic preamble sign indicating number that the back is handled in the data division scrambling of MS time slot to send.
According to above-mentioned improvement, formed the small region search method of MBMS special carrier frequency of the present invention, its basic thought is, MS time slot to the MBMS special carrier frequency cell adopts special basic preamble sign indicating number right, UE searches for and mates at the signal that receives, if match certain basic preamble sign indicating number of these private code centerings, just can according to the corresponding scrambler of basic preamble sign indicating number that matches, finish Cell searching, can determine that also this position that matches is the position of MBMS special carrier frequency cell MS time slot, and then finish down-going synchronous.
At first, the some basic preamble sign indicating numbers that may use MBMS special carrier frequency cell MS time slot of UE and network side agreement are right, and these basic preamble sign indicating numbers that may use are to only being used for the MS time slot of MBMS special carrier frequency cell.Wherein every pair of basic preamble sign indicating number is to all comprising two basic preamble sign indicating numbers.And, UE and network side also arranged these basic preamble sign indicating numbers that may use to the corresponding relation of scrambler, every pair of basic lead codes is all different to pairing scrambler.
Then, network side is adjacent cell configuration for one of each MBMS special carrier frequency cell configuration basic lead codes is right to different sign indicating numbers, sends the basic lead codes of the basic lead codes centering of being disposed then on the MS time slot of the wireless sub-frame of this sub-district.
UE searches on radio carrier frequency and mates basic preamble sign indicating number, if certain basic preamble sign indicating number of the Signal Matching that receives, then write down the position of this coupling, this position is the position of MBMS special carrier frequency cell MS time slot, thereby UE can know the original position of each wireless sub-frame, and then can finish down-going synchronous.And the pairing basic preamble in the position that is matched is right to the basic preamble sign indicating number that is this sub-district and adopts, according to this basic preamble sign indicating number to the corresponding relation of scrambler, can realize Cell searching.
Below describe the technology of the present invention feature in detail by an embodiment based on above-mentioned thought.See also Fig. 6, present embodiment comprises step:
It is right that step 601, UE and network equipment are arranged the basic preamble sign indicating number of cell-specific of one group of MBMS special carrier frequency, and determine that therefrom a basic preamble sign indicating number uses for the MBMS special carrier frequency cell to configuration.This basic preamble sign indicating number is respectively PP00 and PP01 to containing two basic preamble sign indicating numbers.Previous subframe at PCCPCH channel head, adopt second right sign indicating number PP01 of this basic preamble sign indicating number, as the basic preamble sign indicating number of this subframe MS time slot, in other subframe, adopt right first yard PP00 of this basic preamble sign indicating number, as the basic preamble sign indicating number of MS time slot.
In the middle of other embodiment, also can be chosen in the previous subframe of PCCPCH channel head, adopt the basic preamble sign indicating number of right first yard PP00 of this basic preamble sign indicating number as this subframe MS time slot, in other subframe, adopt the basic preamble sign indicating number of second right sign indicating number PP01 of this basic preamble sign indicating number as the MS time slot, the present invention does not make qualification to this.
Step 602, UE is when carrying out down-going synchronous, and the basic preamble sign indicating number using on its MS time slot with the MBMS special carrier frequency cell on the radio carrier frequency removes to mate the signal that receives, to determine the position of MS time slot.If arrive PP00 or PP01 in certain location matches, so just can determine that this position that matches is the position of MS time slot, but also can determine that the basic preamble sign indicating number under PP00 or the PP01 is right, it is right to be the employed basic preamble sign indicating number of MBMS special carrier frequency cell.
Step 603 has determined that the basic preamble sign indicating number that the MS time slot adopts is right, according to basic preamble sign indicating number to the corresponding relation of scrambler, just obtained at the employed scrambler of MS time slot, with determined scrambler the data division of MS time slot is carried out descrambling.
In addition, owing to determine the position of MS time slot,, can obtain the starting position of each wireless sub-frame so according to the position of MS time slot in the wireless sub-frame structure.
If the basic preamble sign indicating number of the detected MS time slot of UE is first sign indicating number of sign indicating number centering, PP00 just continues to detect the preamble sign indicating number of MS time slot so at next wireless sub-frame.If the basic preamble sign indicating number of detected MS time slot is second sign indicating number of certain yard centering, PP01 just, UE thinks from next wireless sub-frame so, be the beginning of the PCCPCH channel of MS time slot carrying, and according to its needs, begin to receive the PCCPCH channel from next wireless sub-frame, finish Cell searching.
The inventive method provides in the TD-SCDMA system, the MBMS special carrier frequency cell adopts non-single fixing basic preamble at its MS time slot, realize that UE finishes down-going synchronous and Cell searching function, can avoid the problems such as co-channel interference that adopt single fixing basic premable sign indicating number to bring at the MS of MBMS special carrier frequency cell time slot.
Though the disclosed execution mode of the present invention as above, described content is not in order to limit.Technical staff in any the technical field of the invention under the prerequisite that does not break away from the disclosed spirit and scope of the present invention, can do a little change and retouching what implement in form and on the details.Scope of patent protection of the present invention, still must with appending claims the person of being defined be as the criterion.
Claims (7)
1, a kind of small region search method of multimedia broadcasting/multicast service special carrier frequency is characterized in that:
The basic lead codes that is exclusively used in multimedia broadcasting/multicast services special time slot of user terminal and network side configuration agreement to and with the incidence relation of scrambler, the basic lead codes that wherein is exclusively used in special time slot is right to being different from the basic lead codes that is used for other business time-slots;
Described user terminal is in cell search process, basic lead codes to described special time slot is mated, after matching basic lead codes, determine and the corresponding scrambler of basic lead codes that matches, the data division of described special time slot is carried out descrambling according to described scrambler.
2, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 1 is characterized in that:
Described user terminal and network side agreement some to the basic lead codes that is exclusively used in special time slot to and corresponding scrambler, every pair of basic lead codes is different to pairing scrambler;
For basic lead codes that is adjacent cell configuration of multimedia broadcasting/multicast service special carrier frequency cell configuration is right to different basic lead codes, on the special time slot of the wireless sub-frame of this sub-district, send the basic lead codes of the basic lead codes centering of being disposed then.
3, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 2 is characterized in that:
The basic lead codes of described configuration is to corresponding scrambler, described network side is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt described basic lead codes of on special time slot, arranging that pairing scrambler is carried out scrambling, on special time slot, send then.
4, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 2 is characterized in that:
The corresponding scrambler of each basic lead codes of the basic lead codes centering of described configuration, described network side is to the data division of multimedia broadcasting/multicast service special carrier frequency cell special time slot, adopt the pairing scrambler of described basic lead codes of on special time slot, arranging to carry out scrambling, on special time slot, send then.
5, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 2 is characterized in that:
Described neighbor cell is the adjacent sub-district of frequency, comprises the sub-district that the geographical position is adjacent and the geographical position is overlapping, its frequency is the sub-district of neighbouring relations.
6, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 1 is characterized in that:
Described network side sends a basic lead codes P0 of the sign indicating number centering of being disposed on the special time slot of the previous wireless sub-frame of physics master control channel head place subframe, send another basic lead codes P1 of the sign indicating number centering of being disposed on the special time slot of other wireless sub-frame.
7, the small region search method of multimedia broadcasting/multicast service special carrier frequency as claimed in claim 6 is characterized in that:
The basic lead codes of the detected special time slot of described user terminal is described P0, then continue to detect the basic lead codes of next wireless sub-frame special time slot, P1 as described in as the basic lead codes of detected special time slot being, determine that then next wireless sub-frame is the beginning of the physics master control channel of special time slot carrying, finishes Cell searching.
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| CN101964944B (en) * | 2009-07-21 | 2013-03-27 | 中兴通讯股份有限公司 | Method and system for isolating interference of multimedia broadcast and multicast service cell |
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| CN100479414C (en) * | 2005-02-04 | 2009-04-15 | 华为技术有限公司 | Transmission method for controlling access-in information on channel in multi-media broadcasting/organization broadcasting business |
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| CN101964944B (en) * | 2009-07-21 | 2013-03-27 | 中兴通讯股份有限公司 | Method and system for isolating interference of multimedia broadcast and multicast service cell |
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