CN1988425A - Down sending method and its device for broadcast multicast service data - Google Patents
Down sending method and its device for broadcast multicast service data Download PDFInfo
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- CN1988425A CN1988425A CNA2005101350094A CN200510135009A CN1988425A CN 1988425 A CN1988425 A CN 1988425A CN A2005101350094 A CNA2005101350094 A CN A2005101350094A CN 200510135009 A CN200510135009 A CN 200510135009A CN 1988425 A CN1988425 A CN 1988425A
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Abstract
This invention discloses a send-down method for broadcast and multicast service data including: the system can select at least two different transmission bandwidths in the sphere supported by a managed user terminal and sends same broadcast and multicast service data based on the selected transmission bandwidth, besides, this invention also discloses a send-down device of broadcast and multicast service data.
Description
Technical field
The present invention relates to the wireless communication technology field that user terminal carries out data interaction based on different transmission bandwidths and system, especially relate to a kind of delivery method and device thereof of broadcast and multicast service data.
Background technology
The next generation mobile communication Technology Need is supported speech, data, audio frequency, video and image etc. are type of service widely, in order to realize supporting the multiple business type, just require the higher data rate of next generation mobile communication system support, higher spectrum efficiency, and perfect service quality (QOS, Quality Of Service) security mechanism, to provide better mobility support and network seamless to cover, provide communication service target anywhere or anytime thereby be embodied as the user.
Wherein second generation mobile communication inserts (CDMA mainly uses) main access technology as system with time division multiple access access (TDMA mainly uses) and Narrowband CDMA in the IS-95 system in gsm system; 3G (Third Generation) Moblie is with the main access technology of wideband CDMA (mainly using in UMTS, WCDMA system) as system.In the middle of CDMA technology, a user data symbol will take all carrier frequency bandwidth, and different users or user data symbol are distinguished by different spreading codes.But because multipath channel has been destroyed the orthogonality between the spreading code, therefore institute uses CDMA technology as the power system capacity of main access technology and the requirement that spectrum efficiency all can't satisfy broadband wireless communications so that CDMA technology becomes a self-interference system.
Since the nineties in 20th century, multi-transceiver technology becomes the hot spot technology of broadband wireless communications, and its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers that mark off.In the middle of the system applies of majority, the width of subcarrier is less than the coherence bandwidth of channel, make like this on frequency-selective channel, decline on each subcarrier is flat fading, therefore just reduced crosstalking between the user data symbol, and do not need complicated channel equalization, be suitable for the transmission of high data rate.Existing multi-transceiver technology has various ways, insert (OFDMA as OFDM, Orthogonal Frequency Division Multiplex Access), CDMA multiple carrier (MC-CDMA, Multiplex Carrier CDMA), multicarrier CDMA direct spread (MC-DS-CDMA, MultiplexCarrier-Direct Spread-CDMA) and technology such as time-frequency domain two-dimensional expansion, be included in the multiple expansion technique on these technical foundation in addition.
Wherein, OFDM (OFDM, Orthogonal Frequency Division Multiplex) technology is more representational a kind of technology in the middle of the multi-transceiver technology, it is divided into some orthogonal sub-channels with given channel in frequency domain, and allow subcarrier spectrum to overlap, as long as, just can isolate different data-signals from overlapping subcarrier because satisfy between the different sub carrier mutually orthogonally.
Please refer to Fig. 1, this figure is the modulation and demodulation system processing procedure schematic diagram that has basic ofdm system now, as shown in Figure 1, in ofdm system, user data at first passes through chnnel coding and interleaving treatment, adopt the data after certain modulation system (as adopting modulation systems such as BPSK, QPSK and QAM) is handled code interleaving to modulate then to form user data symbol, user data symbol is again through being modulated on the radio frequency after the OFDM operation, wherein reverse rectification processing procedure and this process contrary are no longer too much given unnecessary details here.
Wherein above-mentioned in the middle of the OFDM operation, at first user data symbol to be carried out serial/parallel conversion, to form the sub data flow of a plurality of low rates, wherein each sub data flow takies a subcarrier, and the processing that each sub data flow is mapped on the corresponding subcarrier can be by reverse discrete Fourier transform (DFT) (IDFT, InverseDiscrete Fourier Transformation) or reverse fast fourier transform (IFFT, Inverse FastFourier Transformation) handle and to realize.Then by adding Cyclic Prefix (CP; Cyclic Prefix) time-domain signal that is treated to after IDFT or IFFT handle increases Cyclic Prefix (CP); with at interval as protection; can significantly reduce like this in addition blanking code between interference problem; and guaranteed the orthogonality of each interchannel, thereby significantly reduced the interference of interchannel.
At present, realize multimedia broadcast-multicast service (MBMS based on the OFDM multi-transceiver technology, Multimedia Broadcast/Multicast Service) is one of business important in the long-time evolution items tissue (LTE, Long-Time Evolution).Wherein the MBMS business mainly is meant the business that network side is broadcasted identical multi-medium data simultaneously or multicast is given a plurality of recipients in the network, and present multi-medium data mainly comprises some stream business and background (Background) business etc.
As mentioned above, in order to reduce the caused intersymbol interference of multidiameter delay, usually to adopt the method that increases CP in the time-domain signal after IDFT or IFFT processing to avoid, wherein the CP of Jia Ruing is long more, the caused intersymbol interference ability of anti-multipath time delay is strong more, but long CP has also caused the problem that efficiency of transmission further reduces, so in the ofdm system of reality, the length that adds CP will be provided with different numerical value according to different application scenarioss.
Be divided into two kinds of short CP and long CP in the LTE project, the time span of its short-and-medium CP is TCP ≈ 4.7 μ s, and it is mainly used under the situation of non-broadcasting service (Unicast); The time span of long CP is TCP ≈ 16.7 μ s, and it is mainly used under the bigger situation of multimedia broadcast-multicast service (MBMS) and cell diameter.For the smaller sub-district of diameter, or when system send be the Unicast business datum time, adopt short CP usually; And when system send be the MBMS business datum time, or the diameter of sub-district just adopts long CP when bigger.
Wherein for all user terminal (UE, User Equipment) all adopt identical transmission bandwidth and system to carry out the wireless communication system of data interaction, here can be defined as the single-frequency wireless communication system, all belong to the single-frequency wireless communication system as existing WCDMA system etc.In the single-frequency wireless communication system, defined the system that how to realize issues mode from the MBMS business datum to UE, as in the WCDMAR6 version, put multiple spot control channel (MCCH by definition by multimedia broadcasting and multicast, MBMSpoint-to-multipoint Control Channel), multimedia broadcasting and multicast is put multiple spot scheduling channel (MSCH, MBMS point-to-multipoint Scheduling Channel) and multimedia broadcasting and multicast point-to-multipoint service channel (MTCH, issuing of MBMS business datum finished in cooperatively interacting MBMS point-to-multipoint Traffic Channel), and wherein concrete implementation method sees also the associated description in the 3GPP TS25.346 baseline documents.Wherein system can adopt point-to-point (P-T-P, Point-to-Point) or put multiple spot (P-T-M, Point-to-Multipoint) dual mode is finished issuing of MBMS business datum, its concise and to the point implementation procedure is as follows:
System is before issuing the MBMS business datum, at first the UE number that can receive this MBMS business datum in the sub-district being added up (counting) handles, promptly calculate the UE number that can receive this MBMS business datum in the sub-district, when the UE number that calculates during greater than a specified thresholds, then system utilizes broadcast channel to issue the MBMS business datum in this sub-district, and this mode of issuing is referred to as the P-T-M mode; When the UE number that calculates during smaller or equal to this specified thresholds, then system issues the MBMS business datum to each UE respectively, and this mode of issuing is referred to as the P-T-P mode.
In the RAN28 meeting that LTE organizes, determined the frequency bandwidth in 1.25MHz～20MHz is applied in the wireless communication system based on the OFDM multi-transceiver technology, promptly in same OFDM wireless communication system, different UE can adopt different transmission bandwidth (can adopt transmission bandwidths such as 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz as UE) and system to carry out data interaction.Here the wireless communication system that can adopt different transmission bandwidths and system to carry out data interaction different UEs is defined as the multi-frequency radio communication system.
But at present in the research document of LTE tissue, how not provide in the multi-frequency radio communication system, the realization system issues the mode that broadcasting multicast service is given different UEs.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of delivery method and device thereof of broadcast and multicast service data, to carry out in the wireless communication system of data interaction based on different transmission bandwidths and system, realize issuing broadcast and multicast service data to UE in different UEs.
For addressing the above problem, the technical scheme that the present invention proposes is as follows:
A kind of delivery method of broadcast and multicast service data comprises step:
System is selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that the administration user terminal can be supported; And
Issue identical broadcast and multicast service data respectively based on each selected transmission bandwidth.
Preferably, the described step that before issuing broadcast and multicast service data, also comprises based on selected transmission bandwidth:
System will receive the transmission bandwidth ability that the user terminal of the broadcast and multicast service data that issues based on this selected transmission bandwidth need have and be carried in the broadcast multicase control information, and described transmission bandwidth ability is more than or equal to this selected transmission bandwidth; And
Described broadcast multicase control information is issued.
Preferably, system issues broadcast multicase control information separately in each sub-district.
Preferably, system issues identical broadcast and multicast service data simultaneously based on each selected transmission bandwidth between neighbor cell.
Preferably, system issues identical broadcast and multicast service data separately based on each selected transmission bandwidth in each sub-district.
Preferably, described method also comprises the size order of system by selected transmission bandwidth, selected transmission bandwidth is divided into the step of high-transmission portions of bandwidth and low transmission portions of bandwidth.
Preferably, system issues identical broadcast and multicast service data simultaneously based on each transmission bandwidth in the high-transmission portions of bandwidth between neighbor cell; And, in each sub-district, issue identical broadcast and multicast service data separately based on each transmission bandwidth in the low transmission portions of bandwidth.
Preferably, system adopts long loop prefix that the broadcast and multicast service data that issues simultaneously between neighbor cell is carried out the OFDM processing.
Preferably, system adopts short Cyclic Prefix that the broadcast and multicast service data that issues separately in each sub-district is carried out the OFDM processing.
Preferably, also comprise step before system issues broadcast and multicast service data separately in each sub-district:
The user terminal number that receives this broadcast and multicast service data in each sub-district is added up;
Statistics is determined to take a little to issue broadcast and multicast service data to multipoint system more than or equal to the sub-district of regulation number; And
Determine to take point to point system to issue broadcast and multicast service data to statistics less than the sub-district of regulation number.
Preferably, system is identical based on the broadcast and multicast service data content that each selected transmission bandwidth issues, the precision difference.
Preferably, system selectes two transmission bandwidths, comprises another interior transmission bandwidth of transmission bandwidth scope that minimum transfer bandwidth that self user terminal of administering can be supported and self user terminal of administering can be supported.
Preferably, described broadcast and multicast service data is a multimedia broadcast and multicast service data.
A kind of following transmitting apparatus of broadcast and multicast service data comprises:
Transmission bandwidth is selected the unit, is used for system's selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that the administration user terminal can be supported;
The business datum transmitting element is used for issuing identical broadcast and multicast service data respectively based on each selected transmission bandwidth of the selected unit of described transmission bandwidth.
Preferably, described transmitting apparatus down also comprises:
The control information processing unit, be used for the transmission bandwidth ability that user terminal that system will receive the broadcast and multicast service data that issues based on selected transmission bandwidth need have and be carried on broadcast multicase control information, described transmission bandwidth ability is more than or equal to the selected corresponding transmission bandwidth in the selected unit of described transmission bandwidth;
Control information issues the unit, is used for the broadcast multicase control information after the described control information processing unit processes is issued.
The beneficial effect that the present invention can reach is as follows:
Technical solution of the present invention is selected at least two mutually different transmission bandwidths by system in the transmission bandwidth scope that administration UE can support, and issues identical broadcast and multicast service data respectively based on each selected transmission bandwidth.Realized thus in the multi-frequency radio communication system, carry out the characteristic of data interaction based on different transmission bandwidths and network side according to each UE, proposition will unify to issue broadcast and multicast service data in the single-frequency wireless communication system mode changes to and same broadcast and multicast service data is divided at least twice sends, send based on different transmission bandwidths at every turn, make each UE successively receive the purpose of identical broadcast and multicast service data with different transmission bandwidth abilities thereby reached.
Simultaneously, technical solution of the present invention has not only solved and has not realized in the multi-frequency radio communication system in the prior art that broadcast and multicast service data issues the problem of mode, and this scheme can also improve the efficient that issues of broadcast and multicast service data, and avoids too much taking the transmission bandwidth resource.
Description of drawings
Fig. 1 is for having the modulation and demodulation system processing procedure schematic diagram of basic ofdm system now;
Fig. 2 is the main realization principle flow chart of the delivery method of broadcast and multicast service data of the present invention;
Fig. 3 is for using the first embodiment schematic diagram that the inventive method principle is implemented;
Fig. 4 is for using the second embodiment schematic diagram that the inventive method principle is implemented;
Fig. 5 is the main composition structured flowchart of the following transmitting apparatus of broadcast and multicast service data of the present invention;
Fig. 6 is for increasing the concrete composition structured flowchart after the informing user terminal respective transmissions bandwidth ability function in the transmitting apparatus under the present invention.
Embodiment
Technical solution of the present invention mainly is in the multi-frequency radio communication system (as the OFDM wireless communication system), the network characteristic that different UEs can be carried out data interaction based on different transmission bandwidths and system, and propose to come the realization system to issue the processing mode that broadcast and multicast service data is given each UE based on this network characteristic, can only in the single-frequency wireless communication system, (as the WCDMA wireless communication system) realize issuing broadcast and multicast service data to solve in the above-mentioned prior art, and can't in the multi-frequency radio communication system, realize issuing the problem of broadcast and multicast service data to each UE to each UE.
Below in conjunction with each accompanying drawing main realization principle of the present invention, specific implementation process and corresponding beneficial effect thereof are explained in detail.
Please refer to Fig. 2, this figure is the main realization principle flow chart of the delivery method of broadcast and multicast service data of the present invention, and its main implementation procedure is as follows:
Step S10, system be selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that administration UE can support; More preferably, system can only select two mutually different transmission bandwidths, and its these selected two transmission bandwidths comprise another interior transmission bandwidth of transmission bandwidth scope that minimum transfer bandwidth that UE that system administers can support and UE that system administers can support.
Wherein said here system is the multi-frequency radio communication system of above-mentioned definition, as can but be not limited to the OFDM wireless communication system; Be example for example with the OFDM wireless communication system, the transmission bandwidth scope that each UE under its system administers can support is 1.25MHz～20MHz (transmission bandwidth that the UE in the common OFDM wireless communication system can support comprises six transmission bandwidths such as 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz), system just can select at least two mutually different transmission bandwidths in the frequency bandwidth of 1.25MHz～20MHz like this, as selecting two transmission bandwidths of 1.25MHz and 10MHz.
Step S20, system is based on above-mentioned each selected transmission bandwidth, issue identical broadcast and multicast service data respectively, be that system need all issue broadcast and multicast service data one time on each selected transmission bandwidth, and the broadcast and multicast service data that issues on each selected transmission bandwidth should be identical, and wherein system is issued broadcast and multicast service data on each selected transmission bandwidth time order and function does not have specific (special) requirements in proper order; In addition, the broadcast and multicast service data of mentioning here can but be not limited to the MBMS business datum.
When wherein system prepares to issue broadcast and multicast service data on a selected transmission bandwidth, the transmission bandwidth ability that can be at first the UE that is received in the broadcast and multicast service data that this selected transmission bandwidth issues need be had is carried in the broadcast multicase control information, and the broadcast multicase control information after will handling issues, wherein the transmission bandwidth ability that need carry in broadcast multicase control information is greater than and equals this selected transmission bandwidth, more preferably, system can be controlled at and issue broadcast multicase control information in each sub-district separately.
First kind of situation: in above-mentioned steps S20, system is based on each selected transmission bandwidth, and the NodeB that can control between the neighbor cell issues identical broadcast and multicast service data simultaneously; In addition, system is identical based on the broadcast and multicast service data content that selected different transmission bandwidths issue, but precision might be different, as use selected transmission bandwidth 1.25MHz and 10MHz to transmit same cartoon picture respectively, this cartoon picture that might issue on the 1.25MHz transmission bandwidth is a black and white, and this cartoon picture that issues on the 10MHz transmission bandwidth is colored.The technology implementation principle of this situation such as following is that example describes to issue the MBMS business datum here:
System side issues same MBMS business datum at twice, the process that at every turn issues is finished on different transmission bandwidths respectively: in the system, an at first default transmission bandwidth M (M is in the transmission bandwidth scope that UE can support), and it (is that neighbor cell is on default transmission bandwidth M that the form that sends the MBMS business datum between the employing neighbor cell simultaneously issues the MBMS business datum, with identical code modulation mode and take identical temporal frequency resource and issue same MBMS business datum simultaneously), this process of issuing can be defined as the process that issues for the first time, issuing in the process for the first time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of M.The process of issuing is similar to the process that issues for the first time for the second time, also adopt the form that sends the MBMS business datum between the neighbor cell simultaneously to issue the MBMS business datum, only be to use different transmission bandwidths to issue the above-mentioned MBMS business datum that had issued in the process that issuing in the first time, issuing in the process specifically, (N is in the transmission bandwidth scope that UE can support for transmission bandwidth N of systemic presupposition, inequality with above-mentioned M value), this transmission bandwidth N is that UE receives the needed minimum transfer bandwidth of this MBMS business datum, issuing in the process for the second time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of N.The content that wherein issues for the first time the MBMS business datum that the process and the second time issues process and issued is identical, but issue the MBMS business datum that issues in the process for twice can be that different precision is (owing to issue the transmission bandwidth of process issues process greater than the second time transmission bandwidth for the first time, so the precision of the MBMS business datum that issues for the first time will be higher than the precision of the MBMS business datum that issues for the second time), this specifically needs the support of application layer.In addition, issuing process twice can also can at first carry out as issuing process for the second time in time in no particular order in proper order.
According to the technology implementation principle of above-mentioned situation, will enumerate a specific embodiment below and come realization principle of the present invention is described in detail.
Please refer to Fig. 3, this figure uses the first embodiment schematic diagram that the inventive method principle is implemented, suppose in a communication environment, the transmission bandwidth that NodeB can support is 20MHz, the transmission bandwidth ability that UE in each sub-district has comprises: 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz.It is the 10MHz at carrier frequency centre frequency place that system issues the selected transmission bandwidth of process for the first time, and requires to send simultaneously between the neighbor cell MBMS business datum; For the second time issuing the selected transmission bandwidth of process is the 1.25MHz at carrier frequency centre frequency place, also requires to send simultaneously between the neighbor cell MBMS business datum; The content that issues the MBMS business datum that issues in the process for twice is the same, but may concrete data precision not be the same.Concrete implementation process is as follows:
1) system uses the 10MHz transmission bandwidth to issue the MBMS business datum by RNC notice NodeB for the first time, and the UE that requires to be received in the MBMS business datum that issues on the 10MHz transmission bandwidth this moment has the receiving ability more than or equal to the 10MHz transmission bandwidth; For the second time use the 1.25MHz transmission bandwidth to issue the MBMS business datum, the UE that requires to be received in the MBMS business datum that issues on the 1.25MHz transmission bandwidth this moment has the receiving ability more than or equal to the 1.25MHz transmission bandwidth, UE with 10MHz transmission bandwidth receiving ability can select to receive once more, also can select not receive; Simultaneity factor also will notify each NodeB to adopt the mode that sends simultaneously to issue the MBMS business datum by RNC, and concrete MBMS service data information is notified to each NodeB;
2) NodeB is before issuing the MBMS business datum for the first time, each NodeB is sending corresponding M BMS control information by the MCCH channel separately in the sub-district separately, and by MSCH channel transmission corresponding M BMS schedule information, wherein comprise the ability parameter that UE receives the MBMS business datum that this time issues in the control information of Fa Songing, this ability parameter requires transmission bandwidth more than or equal to 10MHz, also includes the MBMS id information;
3) each NodeB in the neighbor cell is according to the relevant parameter in the schedule information, issue the moment of MBMS business datum in arrival, on the transmission bandwidth of 10MHz, send the MBMS business datum simultaneously, hypothesis UE1 and UE2 have the transmission bandwidth ability more than or equal to 10MHz among Fig. 3, UE3～UE9 has more than or equal to 1.25MHz and less than the transmission bandwidth ability of 10MHz, so this issues in the process, have only UE1 and UE2 can receive the MBMS business datum that the NodeB of system issues, and UE3～UE9 can not receive the MBMS business datum that the NodeB of system issues;
4) NodeB is before issuing the MBMS business datum for the second time, each NodeB is sending corresponding M BMS control information by the MCCH channel separately in the sub-district separately, and by MSCH channel transmission corresponding M BMS schedule information, wherein comprise the ability parameter that UE receives the MBMS business datum that this time issues in the control information of Fa Songing, this ability parameter requires transmission bandwidth more than or equal to 1.25MHz, also includes the MBMS id information;
5) each NodeB in the neighbor cell is according to the relevant parameter in the second time schedule information, issue the moment of MBMS business datum in arrival, on the transmission bandwidth of 1.25MHz, send the MBMS business datum that sent last time simultaneously, as above-mentioned, because UE3～UE9 has more than or equal to 1.25MHz among Fig. 3, and transmission bandwidth ability less than 10MHz, so issue in the process at this, UE3～UE9 can receive the MBMS business datum that the NodeB of system issues, and, can whether also to receive the MBMS business datum that this issues by the autonomous decision of UE for UE1 and UE2.
Certainly in last example, system also can select the branch process that issues for three times to issue identical MBMS business datum respectively, issuing for the first time the selected transmission bandwidth of process is the 15MHz at carrier frequency centre frequency place, issuing for the second time the selected transmission bandwidth of process is the 5MHz at carrier frequency centre frequency place, issuing the selected transmission bandwidth of process for the third time is the 1.25MHz at carrier frequency centre frequency place, suppose that UE1 supports the transmission bandwidth of 1.25MHz, UE2 supports the transmission bandwidth of 2.5MHz, UE3～UE6 supports the transmission bandwidth of 10MHz, and UE7～UE9 supports the transmission bandwidth of 15MHz.Each NodeB in the system between the neighbor cell issues the MBMS business datum simultaneously on the transmission bandwidth of 15MHz, then UE7～UE9 can receive this MBMS business datum that issues, and other UE do not receive; Secondly, each NodeB between the neighbor cell issues the MBMS business datum that issued last time simultaneously on the transmission bandwidth of 5MHz, then UE3～UE6 also can and then receive the MBMS business datum, for the UE7～UE9 that received the MBMS business datum, whether this is ready to receive can be decided by UE self; At last, each NodeB between the neighbor cell issues the MBMS business datum that issued last time simultaneously on the transmission bandwidth of 1.25MHz, then UE1 and UE2 also can and then receive the MBMS business datum, for the UE3～UE9 that received the MBMS business datum, whether this is ready to receive can be decided by UE self.
NodeB in the system in each sub-district issues the MBMS business datum that sent last time respectively separately on the transmission bandwidth of 5MHz, for the first time in all adjacent sub-districts
Second kind of situation, in above-mentioned steps S20, system is based on each selected transmission bandwidth, and the NodeB that can also control between the neighbor cell issues identical broadcast and multicast service data separately; System controls each NodeB and issues separately before the broadcast and multicast service data based on arbitrary selected transmission bandwidth wherein, need in advance the UE number that receives this broadcast and multicast service data in each sub-district to be added up, determine to take the P-T-M mode on this selected transmission bandwidth, to issue broadcast and multicast service data to statistics more than or equal to the sub-district of regulation number then, determine to take the P-T-P mode to issue broadcast and multicast service data to statistics on this selected transmission bandwidth less than the sub-district of regulation number simultaneously, follow-up each NodeB adopts P-T-M mode or P-T-P mode to issue broadcast and multicast service data on this selected transmission bandwidth according to the above-mentioned fixed mode of issuing.The same, system is identical based on the broadcast and multicast service data content that selected different transmission bandwidths issue, but precision might be different.The technology implementation principle of this situation such as following is that example describes to issue the MBMS business datum here:
System side issues same MBMS business datum at twice, the process that at every turn issues is finished on different transmission bandwidths respectively: in the system, an at first default transmission bandwidth M (M is in the transmission bandwidth scope that UE can support), and system controls each NodeB and is issuing the MBMS business datum in the sub-district separately separately based on transmission bandwidth M, be that each NodeB does not consider whether other neighbor cells will send the MBMS business datum, just dispatch the MBMS business datum alone, on default transmission bandwidth M, issue, and determine code modulation mode that self is taked the MBMS business datum of desiring to issue and the temporal frequency resource that will take separately by NodeB, issuing in the process for the first time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of M.
For the second time the process that issues mainly is to have the transmission bandwidth ability in each sub-district and also can receive identical MBMS business datum less than the UE of M for guaranteeing to make, in system, (N is in the transmission bandwidth scope that UE can support at first default another transmission bandwidth N, inequality with above-mentioned M value), this transmission bandwidth N is that UE receives the needed minimum transfer bandwidth of this MBMS business datum, and system controls each NodeB and is issuing the MBMS business datum that had issued for the first time in the sub-district separately separately based on transmission bandwidth N, be that the control range of each NodeB only only limits to dispatch the UE in this sub-district, whether simultaneity factor will surpass the regulation number according to the UE number that can receive the MBMS business datum that this time issue in each sub-district, and deciding in each sub-district is to adopt the P-T-P mode or adopt the P-T-M mode to issue the MBMS business datum on transmission bandwidth N.Issuing in the process for the second time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of N.In addition, issuing process twice can also can at first carry out as issuing process for the second time in time in no particular order in proper order.
The third situation, in above-mentioned steps S20, system and then can also be with selected transmission bandwidth according to the amount of bandwidth order, each selected transmission bandwidth is divided into high-transmission portions of bandwidth and two parts of low transmission portions of bandwidth, then based on each transmission bandwidth in the high-transmission portions of bandwidth that marks off, take to issue simultaneously between the neighbor cell mode of identical broadcast and multicast service data, and based on each transmission bandwidth in the low transmission portions of bandwidth that marks off, in each sub-district, issue identical broadcast and multicast service data separately, system controls each NodeB and issues separately before the broadcast and multicast service data based on arbitrary selected transmission bandwidth wherein, need in advance the UE number that receives this broadcast and multicast service data in each sub-district to be added up, determine to take the P-T-M mode on this selected transmission bandwidth, to issue broadcast and multicast service data to statistics more than or equal to the sub-district of regulation number then, determine to take the P-T-P mode to issue broadcast and multicast service data to statistics on this selected transmission bandwidth less than the sub-district of regulation number simultaneously, follow-up each NodeB adopts P-T-M mode or P-T-P mode to issue broadcast and multicast service data on this selected transmission bandwidth according to the above-mentioned fixed mode of issuing.Wherein system uses long CP to carry out the OFDM processing to the broadcast and multicast service data of desiring to issue on each transmission bandwidth in the high-transmission portions of bandwidth, and uses short CP to carry out OFDM to the broadcast and multicast service data of desiring to issue on each transmission bandwidth in the low transmission portions of bandwidth and handle.The same, system is identical based on the broadcast and multicast service data content that selected different transmission bandwidths issue, but precision might be different.The technology implementation principle of this situation such as following is that example describes to issue the MBMS business datum here:
System side issues same MBMS business datum at twice, the process that at every turn issues is finished on different transmission bandwidths respectively: in the system, an at first default transmission bandwidth M (M is in the transmission bandwidth scope that UE can support), and it (is that neighbor cell is on default transmission bandwidth M that the form that sends the MBMS business datum between the employing neighbor cell simultaneously issues the MBMS business datum, with identical code modulation mode and take identical temporal frequency resource and issue same MBMS business datum simultaneously), this process of issuing can be defined as the process that issues for the first time, issuing in the process for the first time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of M.
For the second time the process that issues mainly is to have the transmission bandwidth ability in each sub-district and also can receive identical MBMS business datum less than the UE of M for guaranteeing to make, in system, (N is in the transmission bandwidth scope that UE can support at first default another transmission bandwidth N, inequality with above-mentioned M value), this transmission bandwidth N is that UE receives the needed minimum transfer bandwidth of this MBMS business datum, and system controls each NodeB and is issuing the MBMS business datum that had issued for the first time in the sub-district separately separately based on transmission bandwidth N, be that the control range of each NodeB only only limits to dispatch the UE in this sub-district, whether simultaneity factor will surpass the regulation number according to the UE number that can receive the MBMS business datum that this time issue in each sub-district, and deciding in each sub-district is to adopt the P-T-P mode or adopt the P-T-M mode to issue the MBMS business datum on transmission bandwidth N.Issuing in the process for the second time, every have the transmission bandwidth ability and can receive the MBMS business datum that this time issues more than or equal to the UE of N.
Above-mentioned issuing in the process for the first time, system can adopt long CP that the MBMS business datum of desiring to issue on transmission bandwidth M is carried out the OFDM operational processes, issuing in the process for the second time, system can adopt short CP that the MBMS business datum of desiring to issue on transmission bandwidth N is carried out the OFDM operational processes.In addition, issuing process twice can also can at first carry out as issuing process for the second time in time in no particular order in proper order.
According to the technology implementation principle of above-mentioned the third situation, will enumerate a specific embodiment below and come realization principle of the present invention is described in detail.
Please refer to Fig. 4, this figure uses the second embodiment schematic diagram that the inventive method principle is implemented, suppose in a communication environment, the transmission bandwidth that NodeB can support is 20MHz, the transmission bandwidth ability that UE in each sub-district has comprises: 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz.It is the 10MHz at carrier frequency centre frequency place that system issues the selected transmission bandwidth of process for the first time, and requires to send simultaneously between the neighbor cell MBMS business datum; For the second time issuing the selected transmission bandwidth of process is the 1.25MHz at carrier frequency centre frequency place, requires each sub-district scheduling and transmission MBMS business datum separately; The content that issues the MBMS business datum that issues in the process for twice is the same, but may concrete data precision not be the same.Concrete implementation process is as follows:
1) system uses the 10MHz transmission bandwidth to issue the MBMS business datum by RNC notice NodeB for the first time, and the UE that requires to be received in the MBMS business datum that issues on the 10MHz transmission bandwidth this moment has the receiving ability more than or equal to the 10MHz transmission bandwidth; For the second time use the 1.25MHz transmission bandwidth to issue the MBMS business datum, the UE that requires to be received in the MBMS business datum that issues on the 1.25MHz transmission bandwidth this moment has the receiving ability more than or equal to the 1.25MHz transmission bandwidth, UE with 10MHz transmission bandwidth receiving ability can select to receive once more, also can select not receive; Simultaneity factor also will be notified each NodeB to issue the mode that adopts neighbor cell to send simultaneously in the process in the first time by RNC and issue the MBMS business datum, issue the MBMS business datum in the mode that issues for the second time the independent transmission in each sub-district of employing in the process; And concrete MBMS service data information is notified to each NodeB;
2) NodeB is before issuing the MBMS business datum for the first time, each NodeB is sending corresponding M BMS control information by the MCCH channel separately in the sub-district separately, and by MSCH channel transmission corresponding M BMS schedule information, wherein comprise the ability parameter that UE receives the MBMS business datum that this time issues in the control information of Fa Songing, this ability parameter requires transmission bandwidth more than or equal to 10MHz, also includes the MBMS id information;
3) each NodeB in the neighbor cell is according to the relevant parameter in the schedule information, issues moment of MBMS business datum in arrival, sends the MBMS business datum simultaneously on the transmission bandwidth of 10MHz; Hypothesis UE1 and UE2 have the transmission bandwidth ability more than or equal to 10MHz among Fig. 4, UE3～UE9 has more than or equal to 1.25MHz and less than the transmission bandwidth ability of 10MHz, so this issues in the process, have only UE1 and UE2 can receive the MBMS business datum that the NodeB of system issues, and UE3～UE9 can not receive the MBMS business datum that the NodeB of system issues;
4) NodeB is before issuing the MBMS business datum for the second time, each NodeB is sending corresponding M BMS control information by the MCCH channel separately in the sub-district separately, and by MSCH channel transmission corresponding M BMS schedule information, wherein comprise the ability parameter that UE receives the MBMS business datum that this time issues in the control information of Fa Songing, this ability parameter requires transmission bandwidth more than or equal to 1.25MHz, also includes the MBMS id information;
Each NodeB can also and then initiate statistics (counting) processing procedure on the MCCH channel simultaneously, is used for adding up the UE number of self controlling this MBMS business datum that issues for the second time of reception in the sub-district.
5) whether the UE number that comes out according to self of each NodeB predesignates number more than or equal to one, decide and adopt P-T-P or P-T-M mode separately in self sub-district, send the MBMS business datum that sent last time based on the transmission bandwidth of 1.25MHz;
For example suppose in Fig. 4 after counting handles, to obtain comprising in the sub-district 12 UE that can receive this MBMS business datum that issues, be UE3 and UE4; Comprise 5 UE that can receive this MBMS business datum that issues, i.e. UE5～UE9 in the sub-district 2; If system's regulation had only the UE number that receives business datum in the sub-district more than or equal to 3 o'clock, just adopt the P-T-M mode to issue the MBMS business datum, otherwise adopt the P-T-P mode to issue the MBMS business datum, so issue in the process at this, NodeB in the sub-district 1 will adopt the P-T-P mode to send the MBMS business datum that sent last time on the transmission bandwidth of 1.25MHz, and the NodeB in the sub-district 2 will adopt the P-T-M mode to send the MBMS business datum that sent last time on the transmission bandwidth of 1.25MHz.
Certainly in last example, system also can select the branch process that issues for three times to issue identical MBMS business datum respectively, issuing for the first time the selected transmission bandwidth of process is the 15MHz at carrier frequency centre frequency place, issuing for the second time the selected transmission bandwidth of process is the 5MHz at carrier frequency centre frequency place, issuing the selected transmission bandwidth of process for the third time is the 1.25MHz at carrier frequency centre frequency place, suppose that UE1 supports the transmission bandwidth of 1.25MHz, UE2 supports the transmission bandwidth of 2.5MHz, UE3～UE7 supports the transmission bandwidth of 10MHz, and UE8～UE9 supports the transmission bandwidth of 15MHz.NodeB in the system between the neighbor cell issues the MBMS business datum simultaneously on the transmission bandwidth of 15MHz, then UE8～UE9 can receive this MBMS business datum that issues, and other UE do not receive; Secondly, NodeB in each sub-district adopts the P-T-M mode to issue the MBMS business datum that issued last time separately separately on the transmission bandwidth of 5MHz, then UE3～UE7 also can and then receive the MBMS business datum, for the UE8～UE9 that received the MBMS business datum, whether this is ready to receive can be decided by UE self; At last, NodeB in each sub-district adopts the P-T-P mode to issue the MBMS business datum that issued last time separately separately on the transmission bandwidth of 1.25MHz, then UE1 and UE2 also can and then receive the MBMS business datum, for the UE3～UE9 that received the MBMS business datum, whether this is ready to receive can be decided by UE self.
In sum, the present invention program is by in the multi-frequency radio communication system, carry out the characteristic of data interaction based on different transmission bandwidths and network side according to each UE, proposition will unify to issue the MBMS business datum in the single-frequency wireless communication system mode changes to and same MBMS business datum is divided at least twice sends, send based on different transmission bandwidths at every turn, can make respectively that like this each UE with different transmission bandwidth abilities successively receives identical MBMS business datum, the present invention program has not only solved and has not realized in the multi-frequency radio communication system in the prior art that the MBMS business datum issues the problem of mode, and this scheme can also improve the efficient that issues of MBMS business datum, and avoids too much taking the transmission bandwidth resource.
Corresponding to the delivery method of the broadcast and multicast service data of the above-mentioned proposition of the present invention, the present invention has also proposed a kind of following transmitting apparatus of broadcast and multicast service data here.Please refer to Fig. 5, this figure is the main composition structured flowchart of the following transmitting apparatus of broadcast and multicast service data of the present invention, and it mainly comprises selected unit 10 of transmission bandwidth and business datum transmitting element 20, and the concrete effect of each component units is as follows:
Transmission bandwidth is selected unit 10, and the system that is mainly used in is selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that administration UE can support;
Business datum transmitting element 20 is mainly used in based on each selected transmission bandwidth of the selected unit of above-mentioned transmission bandwidth 10, issues identical broadcast and multicast service data respectively.
Please refer to Fig. 6, this figure is the concrete composition structured flowchart that increases in the transmitting apparatus under the present invention after the informing user terminal respective transmissions bandwidth ability function, it is on the basis of above-mentioned main composition structure, also and then include control information processing unit 30 and control information issues unit 40, the main effect of these two newly-increased unit is as follows:
Control information processing unit 30, the system of being mainly used in will receive the transmission bandwidth ability that the UE of the broadcast and multicast service data that issues based on the selected unit of transmission bandwidth 10 selected transmission bandwidths need have and be carried in the broadcast multicase control information, and wherein Cheng Zai transmission bandwidth ability is selected the selected corresponding transmission bandwidth in unit 10 more than or equal to transmission bandwidth;
Control information issues unit 40, is mainly used in the broadcast multicase control information after above-mentioned control information processing unit 30 processing is issued processing.
In addition, other concrete technology implementation details of transmitting apparatus and the correlation technique in the above-mentioned delivery method of the present invention realize that details is same or similar under the present invention, please specifically realize the specific descriptions of details, no longer give here too much to give unnecessary details with reference to the correlation technique in the delivery method of the present invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, a kind of delivery method of broadcast and multicast service data is characterized in that, comprises step:
System is selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that the administration user terminal can be supported; And
Issue identical broadcast and multicast service data respectively based on each selected transmission bandwidth.
2, the method for claim 1 is characterized in that, the described step that also comprised before issuing broadcast and multicast service data based on selected transmission bandwidth:
System will receive the transmission bandwidth ability that the user terminal of the broadcast and multicast service data that issues based on this selected transmission bandwidth need have and be carried in the broadcast multicase control information, and described transmission bandwidth ability is more than or equal to this selected transmission bandwidth; And
Described broadcast multicase control information is issued.
3, method as claimed in claim 2 is characterized in that, system issues broadcast multicase control information separately in each sub-district.
4, the method for claim 1 is characterized in that, system issues identical broadcast and multicast service data simultaneously based on each selected transmission bandwidth between neighbor cell.
5, the method for claim 1 is characterized in that, system issues identical broadcast and multicast service data separately based on each selected transmission bandwidth in each sub-district.
6, the method for claim 1 is characterized in that, also comprises the size order of system by selected transmission bandwidth, selected transmission bandwidth is divided into the step of high-transmission portions of bandwidth and low transmission portions of bandwidth.
7, method as claimed in claim 6 is characterized in that, system issues identical broadcast and multicast service data simultaneously based on each transmission bandwidth in the high-transmission portions of bandwidth between neighbor cell; And
Based on each transmission bandwidth in the low transmission portions of bandwidth, in each sub-district, issue identical broadcast and multicast service data separately.
8, method as claimed in claim 7 is characterized in that, system adopts long loop prefix that the broadcast and multicast service data that issues simultaneously between neighbor cell is carried out OFDM and handles.
9, method as claimed in claim 7 is characterized in that, system adopts short Cyclic Prefix that the broadcast and multicast service data that issues separately in each sub-district is carried out OFDM and handles.
10, as claim 5 or 7 described methods, it is characterized in that, also comprised step system issues broadcast and multicast service data separately in each sub-district before:
The user terminal number that receives this broadcast and multicast service data in each sub-district is added up;
Statistics is determined to take a little to issue broadcast and multicast service data to multipoint system more than or equal to the sub-district of regulation number; And
Determine to take point to point system to issue broadcast and multicast service data to statistics less than the sub-district of regulation number.
11, the method for claim 1 is being characterised in that, system is identical based on the broadcast and multicast service data content that each selected transmission bandwidth issues, the precision difference.
12, the method for claim 1 is characterized in that, system selectes two transmission bandwidths, comprising:
The minimum transfer bandwidth that self user terminal of administering can be supported; With
Another transmission bandwidth in the transmission bandwidth scope that self user terminal of administering can be supported.
13, the method for claim 1 is characterized in that, described broadcast and multicast service data is a multimedia broadcast and multicast service data.
14, a kind of following transmitting apparatus of broadcast and multicast service data is characterized in that, comprising:
Transmission bandwidth is selected the unit, is used for system's selected at least two mutually different transmission bandwidths in the transmission bandwidth scope that the administration user terminal can be supported;
The business datum transmitting element is used for issuing identical broadcast and multicast service data respectively based on each selected transmission bandwidth of the selected unit of described transmission bandwidth.
15, device as claimed in claim 14 is characterized in that, also comprises:
The control information processing unit, be used for the transmission bandwidth ability that user terminal that system will receive the broadcast and multicast service data that issues based on selected transmission bandwidth need have and be carried on broadcast multicase control information, described transmission bandwidth ability is more than or equal to the selected corresponding transmission bandwidth in the selected unit of described transmission bandwidth;
Control information issues the unit, is used for the broadcast multicase control information after the described control information processing unit processes is issued.
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| CNA2005101350094A CN1988425A (en) | 2005-12-23 | 2005-12-23 | Down sending method and its device for broadcast multicast service data |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101742476B (en) * | 2008-11-21 | 2012-08-15 | 中国移动通信集团公司 | Subscription service issuing system and issuing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742476B (en) * | 2008-11-21 | 2012-08-15 | 中国移动通信集团公司 | Subscription service issuing system and issuing method |
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