CN101841771A - Method and device for realizing single-cell multimedia broadcast multicast service (MBMS) transmission - Google Patents
Method and device for realizing single-cell multimedia broadcast multicast service (MBMS) transmission Download PDFInfo
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Abstract
The invention discloses a method and a device for realizing single-cell multimedia broadcast multicast service (MBMS) transmission, which aims to realize single-cell MBMS transmission. The method comprises the following steps: when single-cell MBMS data is transmitted on a physical downlink shared channel (PDSCH), a base station transmits special downlink control instruction (DCI) format organization according to the preset MBMS and sends a control instruction on a physical downlink control channel (PDCCH). Thus, all users in cells can detect the control information, thereby demodulating the corresponding MBMS data to realize single-cell MBMS transmission.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method and device of realizing the single-cell multimedia broadcast multicast service transmission.
Background technology
(Multimedia Broadcast Multicast Service MBMS) is used to that the user provides multimedia broadcasting and multicast services in the wireless area to multimedia broadcast-multicast service.Long Term Evolution (Long TermEvolution, LTE) in the system, the frequency layer of MBMS special use and with the professional frequency layer of sharing of non-MBMS on MBMS can both be provided.Support that the LTE sub-district of MBMS can be that the MBMS dedicated cell also can be a MBMS/ clean culture mixed cell.The MBMS business can be carried out single cell transmission, also can carry out many cell transmission.
MBMS dedicated frequency layer is meant the frequency layer that is specifically designed to the MBMS transmission.When a sub-district is configured to MBMS dedicated frequency layer, claim that this sub-district is the MBMS dedicated cell; Being configured to when a sub-district is not when being specifically designed to the frequency layer of MBMS transmission, to claim that this sub-district is a MBMS/ clean culture mixed cell.Clean culture and MBMS business in the MBMS/ clean culture mixed cell are worked in coordination with transmission, and some is used for the professional transmission of MBMS constantly, and other is used for the unicast service transmission constantly.Single cell transmission of MBMS is meant that MBMS only transmits in the coverage of a designated cell, do not support the combination from the MBMS transmission of many sub-districts; Many cell transmission of MBMS need be supported multicast/multicast single-frequency network (MBSFN) transmission means.Mainly contain with the professional relevant logic channel of MBMS in the current LTE system: Broadcast Control Channel (Broadcast Control CHannel, BCCH), multiple spot control channel (MCCH) and multiple spot time channel (MTCH), transmission channel mainly contains: Multicast Channel (MCH) and DSCH Downlink Shared Channel (DL-SCH).Wherein, BCCH is used for the broadcast system control information; MCCH is used for being sent to UE by evolution base station (eNB) the MBMS control information of one or more MTCH; MTCH is used for sending the MBMS business datum by eNB to UE; MCH and DL-SCH all can be used for the MBMS transmission, but MCH supports MBSFN to merge.
The mapping relations of logic channel and transmission channel are as follows: in single cell transmission of MBMS, MTCH and MCCH are mapped on the DL-SCH, and the corresponding physical channel is PDSCH; In many cell transmission of MBMS, MTCH and MCCH are mapped on the MCH, and the corresponding physical channel is PMCH.
The MBMS of single cell transmission (SC-MBMS, single-cell) professional sends in the overlay area of a specific cell, and its logic channel MTCH and MCCH transmit in the mode of point-to-multipoint (p-t-m).From user's angle, can not distinguish the difference of MBMS business and generic downlink clean culture shared service.
At present in the LTE system, for Physical Downlink Shared Channel (PDSCH), always dispatch, control, and PDCCH to carry out scrambling through different RNTI (Radio Network Temporary Identifier) by the Physical Downlink Control Channel in the same subframe (PDCCH).RNTI is divided into two kinds, and a kind of is that the sub-district is exclusive, and as paging RNTI (P-RNTI), system information RNTI (SI-RNTI), the pairing control signaling of shared information that all users need to read in the sub-district will use such RNTI to carry out scrambling; Another kind is a user-specific, and (cell RNTI, C-RNTI), the proprietary pairing control signaling of data message of user will use such RNTI to carry out scrambling as the MAC layer of each UE numbering.
UE will detect at first whether one's own PDCCH is arranged in the subframe when carrying out the PDSCH reception, the PDCCH that the RNTI whether promptly detect has the use exclusive RNTI in sub-district or this user-specific carries out scrambling.If have, then will be according to the descending control signaling that carries among the PDCCH (DCI), the corresponding PDSCH of demodulation, and this PDSCH and PDCCH are in same subframe.
Because the content about uni-cell MBMS in the standard of LTE system is imperfect as yet, current standard does not point out how to use common PDSCH to realize the professional transmission of uni-cell MBMS.
Summary of the invention
The invention provides a kind of method and device of realizing the single-cell multimedia broadcast multicast service transmission, in order to realize the transmission of uni-cell MBMS business.
A kind of method of single-cell multimedia broadcast multicast service transmission that realizes that the embodiment of the invention provides comprises:
On PDSCH during transmission single-cell multimedia broadcast multi-cast business data, the base station is on down control channel PDCCH, with the MBMS transmission private downlink control information DCI format organization that sets in advance and send control signaling.
A kind of device of single-cell multimedia broadcast multicast service transmission of realizing that the embodiment of the invention provides comprises:
The unit is set, is used to be provided with MBMS transmission private downlink control information DCI form;
Transmission unit is used for transmission single-cell multimedia broadcast multi-cast business data on this PDSCH, and utilizes the concurrent order of delivering letters of MBMS transmission private downlink control information DCI format organization that is provided with.
When the embodiment of the invention was transmitted the single-cell multimedia broadcast multi-cast business data on PDSCH, the base station was on down control channel PDCCH, by the concurrent order of delivering letters of MBMS transmission private downlink control information DCI format organization that sets in advance.Therefore, all users in the sub-district can detect this control information, and then corresponding M BMS data are carried out demodulation, realize the transmission of uni-cell MBMS business.
Description of drawings
Fig. 1 is the structural representation of the device of the embodiment of the invention.
Embodiment
In order on PDSCH, to carry out the SC-MBMS transmission, when on PDSCH, transmitting the single-cell multimedia broadcast multi-cast business data, utilize the exclusive MB-RNTI in sub-district that is provided with that the control signaling among the PDCCH of described PDSCH correspondence is carried out scrambling; User terminal is when carrying out the PDSCH reception, if detecting, the exclusive MB-RNTI in sub-district that utilize to preserve has the PDCCH that uses the exclusive MB-RNTI in described sub-district to carry out scrambling in the subframe, then according to the PDSCH of the descending control signaling demodulation correspondence of carrying among this PDCCH.
The embodiment of the invention is to carry out on PDSCH SC-MBMS when transmission, and the base station is on down control channel PDCCH, with the MBMS transmission private downlink control information DCI format organization that sets in advance and send control signaling.
For the simplified system complexity, the length of MB-RNTI that can the sub-district is exclusive is identical with other RNTI length, and such as in LTE, the length of the MB-RNTI that the sub-district is exclusive is identical with RNTI length, that is: all be 16 bits.
Mainly comprise in the pairing control signaling of MBMS business datum: Resource Block indication and modulating-coding grade.Wherein, Resource Block indication is used to the physical resource position of indicating PDSCH shared.When the usage space multiplex technique carries out many codeword transmission, also need to comprise in the control signaling: precoding information.
Be the simplified system complexity, avoid introducing new DCI form, cause the increase of UE blind Detecting number of times, the normal operation of existing each function of assurance system simultaneously, therefore the MBMS transmission private downlink control signaling DCI in the embodiment of the invention can reset, also can reuse existing DCI form, wherein information bit is redefined.
Such as: when carrying out the single codeword transmission, described control signaling can adopt DCI format 1A form.Concrete signaling, size and operating position that table 1 is adopted for the transmission of embodiment of the invention single codeword.
Ginseng is shown in Table 1, if MBMS business support HARQ, can be with the indication of the uplink power control among DCI format 1A deletion, that is: the uplink power control indication is set to reserve in the table 1, form the special-purpose DCI form of described MBMS transmission, also comprise in the then described control signaling: form is differentiated sign, resource block assignments sign, resource block location indication, modulating-coding grade, HARQ process number, new data indication, redundancy versions and downlink data packet number.Certainly, transmit in the special-purpose DCI format procedure in that MBMS is set, this method can further include: the redundancy versions among the DCI format 1A is deleted.
If the MBMS business is not supported HARQ, can be with the HARQ process number among the DCI format 1A, new data indication, redundancy versions, uplink power control indication and the deletion of downlink data packet number, form the special-purpose DCI form of described MBMS transmission, also comprise in the then described control signaling: form is differentiated sign, resource block assignments sign, resource block assignments sign, resource block location indication, modulating-coding grade.Wherein, form is differentiated and is designated format0/format 1A resolution sign.
When adopting DCI format 1A form, format1A differentiates sign can take 1 bit, and the resource block assignments sign can take 1 bit, and the resource block location indication can take
Bit.Wherein,
Represent the downlink bandwidth of system with the form of physical resource number of blocks, the bandwidth that Resource Block takies is 180kHz.The modulating-coding grade takies 5 bits, if the FDD system, HARQ process number takies 3 bits, if the TDD system takies 4 bits.The new data indication can take 1 bit, and redundancy versions can take 2 bits, and the downlink data packet number can take 2 bits.
Table 1
When carrying out the single codeword transmission, if the MBMS business is not supported HARQ, be the saving signaling expense, described control signaling can also adopt DCI format 1C form, therefore, can change transmission block size indication among the DCI format1C into the modulating-coding grade, form the special-purpose DCI form of described MBMS transmission.Concrete signaling, size and operating position are as shown in table 2.
Table 2
As can be seen from Table 2, can comprise in the control signaling of MBMS data correspondence: stepped-frequency interval, resource block location indication and resource block size.Wherein, stepped-frequency interval can be supported 1 bit, and resource block location is designated as
Bit, transmission block size are 5 bits.Wherein, N
GapBe stepped-frequency interval,
For transmission block size and
Be the resource block assignments granularity.
When carrying out many codeword transmission, the control of MBMS data correspondence letter the present can be adopted DCI format2C form, and wherein concrete letter the present, size and operating position are as shown in table 3.
As can be seen from Table 3, under the situation of MBMS business support HARQ, can be with the indication of the uplink power control among DCIformat 2A deletion, promptly the uplink power control indication is set to reserve in the table 3, form the special-purpose DCI form of described MBMS transmission, can comprise in the control signaling of MBMS data correspondence at this moment: modulating-coding grade, new data indication and the redundancy versions of resource distribution mode, resource block location indication, downlink data packet number, HARQ process number, transmission block exchange mapped identification, precoding information and each transmission block correspondence.Do not support in the MBMS business under the situation of HARQ, uplink power control among the DCIformat 2A is indicated, the downlink data packet number, HARQ process number, corresponding new data indication of each code word and redundancy versions deletion, that is: the uplink power control among the DCI format 2A is indicated, the downlink data packet number, HARQ process number, corresponding new data indication of each code word and redundancy versions are set to reserve, form the special-purpose DCI form of described MBMS transmission, can comprise in the control signaling of MBMS data correspondence at this moment: resource distribution mode, the resource block location indication, transmission block exchange mapped identification, the modulating-coding grade of precoding information and each transmission block correspondence.Certainly, transmit in the special-purpose DCI format procedure in that MBMS is set, this method can further include: the redundancy versions among the DCI format 2A is deleted.
When the embodiment of the invention adopted DCI format 2C form, resource distribution mode can take 1 bit, and the resource block location indication takies
Bit, the control of ascending control channel power can take 2 bits, and the downlink data packet number can take 3 bits (FDD system) or 4 bits (TDD system).Wherein,
Represent the downlink bandwidth of system with the form of physical resource number of blocks, the bandwidth that Resource Block takies is 180kHz; P is Resource Block group (RBG) size of default, promptly the total Resource Block in the system is divided into groups every group of number of resource blocks that is comprised; TX is a transmitting antenna.
Table 3
Referring to shown in Figure 1, the device of the embodiment of the invention comprises: unit 21 and transmission unit 22 are set.
Wherein, unit 11 is set, is used to be provided with MBMS transmission private downlink control information DCI form;
The device of the embodiment of the invention can be a physical unit independently, also can be used as logic entity and is arranged in the base station.
In addition, can be according to different transmission modes, the described execution mode that the unit is set can comprise that also multiple mode is provided with MBMS transmission private downlink control information DCI form.Below illustrate:
When carrying out the single codeword transmission, if MBMS business support HARQ, the described unit that is provided with can form the special-purpose DCI form of described MBMS transmission with the indication of the uplink power control among DCI format 1A deletion.The described unit that is provided with also is used for transmitting special-purpose DCI format procedure in that MBMS is set, and the redundancy versions among the DCI format 1A is deleted.
When carrying out the single codeword transmission, if the MBMS business is not supported HARQ, the described unit that is provided with can form the special-purpose DCI form of described MBMS transmission with the HARQ process number among the DCI format 1A, new data indication, redundancy versions, uplink power control indication and the deletion of downlink data packet number.
Therefore, in the device of the embodiment of the invention, when carrying out the single codeword transmission, when adopting DCIformat 1A form, if MBMS business support HARQ then comprises in the control signaling of MBMS data correspondence: form is differentiated sign, resource block assignments sign, resource block location indication, modulating-coding grade, HARQ process number, new data indication, redundancy versions and downlink data packet number; If the MBMS business is not supported HARQ, then comprise in the control signaling of MBMS data correspondence: form is differentiated sign, resource block assignments sign, resource block assignments sign, resource block location indication, modulating-coding grade.
When carrying out the single codeword transmission, if the MBMS business is not supported HARQ, the described unit that is provided with can be used for changing the indication of DCI format 1C transmission block size into the modulating-coding grade, forms the special-purpose DCI form of described MBMS transmission.Therefore, when carrying out the single codeword transmission,, can comprise in the control signaling of MBMS data correspondence: stepped-frequency interval, resource block location indication and resource block size if the MBMS business is not supported HARQ.
And, when carrying out many codeword transmission, the control signaling of MBMS data correspondence can be DCI format 2C form in the device of the embodiment of the invention, in this case, the described unit that is provided with is used for when carrying out many codeword transmission, if MBMS business support HARQ, with the indication of the uplink power control among DCI format 2A deletion, form the special-purpose DCI form of described MBMS transmission.Therefore, the control signaling of MBMS data correspondence can comprise: modulating-coding grade, new data indication and the redundancy versions of resource distribution mode, resource block location indication, downlink data packet number, HARQ process number, transmission block exchange mapped identification, precoding information and each transmission block correspondence.The described unit that is provided with also is used for transmitting special-purpose DCI format procedure in that MBMS is set, and the redundancy versions among the DCI format 2A is deleted.
If the MBMS business is not supported HARQ, the described unit that is provided with can form the special-purpose DCI form of described MBMS transmission with the indication of the uplink power control among the DCI format 2A, downlink data packet number, HARQ process number, the corresponding new data indication of each code word and redundancy versions deletion.At this moment, the control signaling of MBMS data correspondence comprises: the modulating-coding grade of resource distribution mode, resource block location indication, transmission block exchange mapped identification, precoding information and each transmission block correspondence.
When the embodiment of the invention was transmitted the single-cell multimedia broadcast multi-cast business data on PDSCH, the base station was on down control channel PDCCH, by the concurrent order of delivering letters of MBMS transmission private downlink control information DCI format organization that sets in advance.Therefore, all users in the sub-district can detect this control information, and then corresponding M BMS data are carried out demodulation, realize the transmission of uni-cell MBMS business.And, can reuse existing descending control signaling form according to different transmission modes in the embodiment of the invention, wherein information bit is redefined, thereby support the uni-cell MBMS transmission.Method of the present invention is simple, avoids introducing new DCI form, causes the increase of UE blind Detecting number of times, the normal operation of existing each function of assurance system simultaneously.
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 (14)
1. realize the professional method of transmitting of single-cell multimedia broadcast multicast MBMS for one kind, it is characterized in that this method comprises:
On Physical Downlink Shared Channel PDSCH during transmission single-cell multimedia broadcast multi-cast business data, the base station is on physical downlink control channel PDCCH, with the MBMS transmission private downlink control signaling DCI format organization that sets in advance and send control signaling.
2. method according to claim 1 is characterized in that, when carrying out the single codeword transmission, described MBMS transmits special-purpose DCI form and is provided with in the following way:
If the MBMS business support mixes automatic repeat requests HARQ,, form the special-purpose DCI form of described MBMS transmission with the indication of the uplink power control among DCI format 1A deletion;
If the MBMS business is not supported HARQ,, form the special-purpose DCI form of described MBMS transmission with the HARQ process number among the DCI format 1A, new data indication, redundancy versions, uplink power control indication and the deletion of downlink data packet number.
3. method according to claim 2 is characterized in that, if MBMS business support HARQ transmits in the special-purpose DCI format procedure in that MBMS is set, this method further comprises:
Redundancy versions among the DCI format 1A is deleted.
4. method according to claim 1 is characterized in that, when carrying out the single codeword transmission, described MBMS transmits special-purpose DCI form and is provided with in the following way:
If the MBMS business is not supported HARQ, change transmission block size indication among the DCI format 1C into the modulating-coding grade, form the special-purpose DCI form of described MBMS transmission.
5. method according to claim 1 is characterized in that, when carrying out many codeword transmission, described MBMS transmits special-purpose DCI form and is provided with in the following way:
If MBMS business support HARQ with the indication of the uplink power control among DCI format 2A deletion, forms the special-purpose DCI form of described MBMS transmission;
If the MBMS business is not supported HARQ,, form the special-purpose DCI form of described MBMS transmission with the indication of the uplink power control among the DCI format 2A, downlink data packet number, HARQ process number, the corresponding new data indication of each code word and redundancy versions deletion.
6. method according to claim 5 is characterized in that, if MBMS business support HARQ transmits in the special-purpose DCI format procedure in that MBMS is set, this method further comprises:
Redundancy versions among the DCI format 2A is deleted.
7. realize the professional device that transmits of single-cell multimedia broadcast multicast MBMS for one kind, it is characterized in that this device comprises:
The unit is set, is used to be provided with MBMS transmission private downlink control information DCI form;
Transmission unit is used for transmission single-cell multimedia broadcast multi-cast business data on this Physical Downlink Shared Channel PDSCH, and utilizes the concurrent order of delivering letters of MBMS transmission private downlink control signaling DCI format organization that is provided with.
8. device according to claim 7, it is characterized in that, the described unit that is provided with, be used for when carrying out the single codeword transmission, if the MBMS business support mixes automatic repeat requests HARQ, with the indication of the uplink power control among DCIformat 1A deletion, form the special-purpose DCI form of described MBMS transmission.
9. device according to claim 8 is characterized in that, the described unit that is provided with also is used for transmitting special-purpose DCI format procedure in that MBMS is set, and the redundancy versions among the DCI format 1A is deleted.
10. device according to claim 7, it is characterized in that, the described unit that is provided with, be used for when carrying out the single codeword transmission, if the MBMS business is not supported HARQ, with the HARQ process number among the DCI format 1A, new data indication, redundancy versions, uplink power control indication and the deletion of downlink data packet number, form the special-purpose DCI form of described MBMS transmission.
11. device according to claim 7 is characterized in that, the described unit that is provided with, be used for when carrying out the single codeword transmission, if the MBMS business is not supported HARQ, change transmission block size indication among the DCI format 1C into the modulating-coding grade, form the special-purpose DCI form of described MBMS transmission.
12. device according to claim 7 is characterized in that, the described unit that is provided with, be used for when carrying out many codeword transmission, if MBMS business support HARQ with the indication of the uplink power control among DCI format 2A deletion, forms the special-purpose DCI form of described MBMS transmission.
13. device according to claim 12 is characterized in that, the described unit that is provided with also is used for transmitting special-purpose DCI format procedure in that MBMS is set, and the redundancy versions among the DCI format 2A is deleted.
14. device according to claim 7, it is characterized in that, the described unit that is provided with, be used for when carrying out many codeword transmission, if the MBMS business is not supported HARQ, with the indication of the uplink power control among the DCI format 2A, downlink data packet number, HARQ process number, the corresponding new data indication of each code word and redundancy versions deletion, form the special-purpose DCI form of described MBMS transmission.
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