CN102067686B - Mixed transmission method, base station and user equipment in single cell MBMS - Google Patents

Mixed transmission method, base station and user equipment in single cell MBMS Download PDF

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CN102067686B
CN102067686B CN200880129933.3A CN200880129933A CN102067686B CN 102067686 B CN102067686 B CN 102067686B CN 200880129933 A CN200880129933 A CN 200880129933A CN 102067686 B CN102067686 B CN 102067686B
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threshold value
base station
transmission method
carry out
initial transmissions
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CN102067686A (en
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张碧军
汪勇刚
胡中骥
杨玉丽
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Abstract

A mixed transmission method, a base station and a user equipment in single cell MBMS are disclosed. The mixed transmission method includes: using the antennas at the most edge of the antenna matrix to perform the initial transmission; setting retransmission thresholds beforehand, and sending the retransmission thresholds to all the interested MBMS user equipments (UE); the UE, of which the SINR of the decoded signal in the UE receiver is between the retransmission thresholds, sends feedback signal; at the e-NB, using all the receiving antennas to estimate the direction of arrival (DoA) of the UEs which already sent back feedback signal; for the retransmission, using all the transmitting antennas to perform the beam forming (BF) operation based on DoA; and if there is no UE between the retransmission thresholds, returning to the step of initial transmission. The invention reduces the uplink feedback cost greatly, effectively reduces the effect which the spacial correlation makes to the transmitting diversity, can be applied to any number of transmitting antenna, and greatly improves the receiving performance of the UE which is in the worst case with no cost of retrogression of other UEs' performances.

Description

The combining transmission method of uni-cell MBMS, base station and subscriber equipment
Technical field
The present invention relates to the multimedia broadcasting and multicast field, more specifically, relate to combining transmission method, base station and the subscriber equipment of uni-cell MBMS.
Background technology
The concept of beam forming BF (beam forming) originates from smart antenna SA, the basic principle of SA is to utilize the correlation of half-wavelength spacing aerial array channel impulse response, by the processing of making a start, form the wave beam of a directive property, improve the signal to noise ratio of receiving terminal, enlarge the coverage of system.Traditional BF is only limited to independent signal stream, after namely signal transmission and a weight factor multiply each other, goes out by many antenna transmissions.General this gain is also referred to as array gain.Afterwards, along with deepening continuously of mimo system research, the concrete meaning of BF has had expansion, and in mimo system, antenna distance is not limited only to half-wavelength, it can be 4 wavelength/10 wavelength etc., the correlation of channel matrix will weaken greatly in this case, and this irrelevance can be brought diversity gain, and common method is Space Time Coding STBC, also can bring spatial multiplexing gain, commonly v-blast.Under this meaning, BF is identical with precoding implication among the MIMO.For example, common multithread BF just can understand so now.The typical implication of characteristic root BF is to utilize the second-order statistics information of channel, and namely the correlation matrix of channel is determined the BF vector by SVD, and in single current BF, choosing with eigenvalue of maximum characteristic of correspondence vector is the BF vector; In multithread BF, choose successively according to size order.For MU-MIMO, BF is equal to SDMA, and here BF matrix or pre-coding matrix need the SINR of maximization unique user, reduce simultaneously the interference between the user as far as possible, and common algorithm is BD.
The MBMS that 3GPP defines in the R6 version (Multimedia Broadcast Multicast Server: multimedia broadcast multi-broadcasting business) refer to that a data source realizes on the basis that does not change network configuration that to point-to-multipoint (p-t-m) business that a plurality of users send data Internet resources are shared in the wireless network.Except mobile core network and access network resource, MBMS can also share more nervous air interface resource, to improve the utilance of Radio Resource.
MBMS typically disposes by two kinds of sights, i.e. the point-to-multipoint p-t-m transmission in single residential quarter (SC) and many residential quarters.Transmit for SC MBMS, can use the advanced physical-layer techniques such as link circuit self-adapting, mixed automatic retransfer request (HARQ), closed-loop MIMO (Multiple Input and Multiple Output) etc., the feedback on the air interface of utilization from the terminal to e-NB is improved the receptivity of user equipment (UE).
Well-known is that beam forming (BF) is a kind of advanced person's closed-loop MIMO technology, is used for improving the throughput of coverage rate and cell edge UE.Two types BF operation has been discussed in the clean culture of 3GPP widely.A kind of down link BF that is based on uplink feedback, another kind are based on the down link BF that up link is estimated.Because consider that according to actual conditions the feedback signaling expense is key factor, be most preferred up to now such as the first scheme that reaches angle DoA (Direction of arrival) scheme based on ripple therefore.
For the single-cell multimedia broadcast multicast service SC MBMS that utilizes beam forming BF, the major defect of existing BF scheme is summarized as follows:
1) transmitting antenna restriction: because the expense of quadrature receiving station RS, existing BF scheme more is applicable to little number of transmit antennas, and for example 2 or 4;
2) uplink feedback signaling overhead constraints: existing whole BF schemes need all UE to the e-NB feedback channel information, for example channel correlation matrix or channel condition information CSI, and the uplink feedback signaling expense is larger;
3) take other UE mis-behaves as cost, improved worst condition UE receptivity: along with e-NB place number of transmit antennas purpose increases, it is narrower that beamwidth becomes.From the viewpoint of coverage rate improvement and neighbor cell interference reduction, because point-to-point p-t-p characteristic, in fact this is useful for unicast transmission.But MBMS is point-to-multipoint, and the shared identical time-frequency resources of a plurality of UE, if narrower beam position worst condition UE, other UE may be subject to very large performance loss.
Summary of the invention
The object of the invention is to overcome the restriction of number of transmit antennas in that a kind of combining transmission method with robustness is provided uplink feedback signaling overhead constraints and overcome the restriction that improves the worst condition receptivity take other UE mis-behaves as cost.
According to embodiments of the invention, a kind of combining transmission method of uni-cell MBMS has been proposed, described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.Said method comprising the steps of: use the antenna at the edge of antenna array to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA; For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation of angle DoA; And if between described threshold value, do not have UE, then get back to the initial transmissions step.
According to embodiments of the invention, a kind of base station of carrying out the mixed transport of uni-cell MBMS has also been proposed, following steps are carried out in described base station: use the antenna at the edge of antenna array of base station to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA at the place, base station; For again emission, use whole transmitting antennas of base station to carry out reaching based on ripple the beam forming BF operation of angle DoA; And if between described threshold value, do not have UE, then get back to the initial transmissions step.
According to embodiments of the invention, a kind of user equipment (UE) that carries out the mixed transport of uni-cell MBMS has also been proposed, described subscriber equipment is carried out following steps: use the antenna at the edge of antenna array to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA at the e-NB place; For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation of angle DoA; And if between described threshold value, do not have UE, then get back to the initial transmissions step.
Preferably, for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions.
Preferably, described retransmission threshold value is effective signal-to-noise ratio SINR threshold value.
Preferably,, set in advance effective signal-to-noise ratio SINR threshold value by eNB, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent it back whole interested MBMS user equipment (UE)s when setting in advance retransmission threshold value described.
Preferably, at UE receiver place, the UE of decoding SINR between described retransmission threshold value beams back feedback signal to e-NB.
Preferably, for again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation of angle DoA based on maximum-minimum principle.
Compared with prior art, beneficial effect of the present invention is: owing to use open loop SFBC and SINR threshold value for initial transmissions, greatly reduce the uplink feedback expense; For initial transmissions, as shown in Figure 7, in the situation of 4 transmitting antennas, use the first and the 4th antenna (as shown in phantom in Figure 7), in the situation of 8 transmitting antennas, use the first and the 8th antenna, because the wider antenna distance in e-NB place has reduced the impact of spatial coherence for transmit diversity effectively; Compare with the prior art that is used for SC MBMS, owing to will only be used for again emission based on the BF algorithm of DoA, according to this hybrid plan easier realization in real system of the embodiment of the invention, and described scheme can be applied to any number of transmit antennas; When making up with HARQ, be applicable to again launch based on the DoA of BF, and target is the UE of worst condition among those UE that beam back signal.As a result, improve widely the receptivity of worst condition UE, but do not had the cost that deteriorates to other UE performances.
This hybrid plan is for the impact of interface signaling: 1) uplink signalling feedback: owing to use open loop space frequency block coding SFBC and SINR threshold value for initial transmissions, only have the UE of decoding threshold value between predetermined threshold to beam back signal to e-NB, reduced widely UL signaling feedback overhead; 2) down link: the SINR threshold value should be signaled in advance to whole interested MBMS UE, and determine described threshold value by the configuration parameter such as radius of society, mcs etc.Can upgrade these parameters if need.
Description of drawings
According to following description by reference to the accompanying drawings, the advantage of the present invention easy to understand that will become, wherein:
Fig. 1 shows the flow chart according to the combining transmission method of the uni-cell MBMS of first embodiment of the invention;
Fig. 2 shows the flow chart according to the combining transmission method of the another kind of uni-cell MBMS of second embodiment of the invention;
Fig. 3 shows the flow chart according to the combining transmission method of the uni-cell MBMS of third embodiment of the invention;
Fig. 4 shows the flow chart according to the combining transmission method of the uni-cell MBMS of fourth embodiment of the invention;
Fig. 5 shows the flow chart according to the combining transmission method of the uni-cell MBMS of fifth embodiment of the invention;
Fig. 6 shows the flow chart according to the combining transmission method of the uni-cell MBMS of sixth embodiment of the invention;
Fig. 7 show according to the embodiment of the invention for initial transmissions under 2,4 and 8 transmit antenna case and the antenna structure of re-emissioning (wherein, the antenna that dots is used for initial transmissions, and whole transmitting antennas are used in emission again);
Fig. 8 shows the cumulative distribution CDF simulation result figure for effective SINR of the 2x2 O-SFBC that does not utilize HARQ;
Fig. 9 shows for the 2x2 O-SFBC that utilize/does not utilize HARQ, utilizes the CDF simulation result figure relatively of effective SINR of the 4x2/8x2 BF of HARQ;
Figure 10 shows for the 2x2 O-SFBC that utilize/does not utilize HARQ, utilizes the CDF simulation result figure relatively of effective SINR of the 4x2/8x2 BF of HARQ;
Figure 11 shows for the 2x2 O-SFBC that utilize/does not utilize HARQ, utilizes the CDF simulation result figure relatively of effective SINR of the 4x2/8x2 BF of HARQ.
Embodiment
Provide detailed reference to embodiments of the invention now.For explaining that the present invention will be described with reference to the drawings following embodiment.
Embodiments of the invention have proposed a kind of combining transmission method with robustness, overcome the restriction of number of transmit antennas, uplink feedback signaling overhead constraints and overcome the restriction that improves the worst condition receptivity take other UE mis-behaves as cost.
Fig. 1 shows the flow chart according to the combining transmission method of the uni-cell MBMS of first embodiment of the invention.Described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.As shown in Figure 1, said method comprising the steps of: use the antenna at the edge of antenna array to carry out initial transmissions (S101); Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s (S102); The UE of decoding SINR between described retransmission threshold value sends feedback signal (S103) in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S104); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S105) of angle DoA; And judge whether there is UE (S106) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S103 and proceed emission according to the embodiment of the invention.
Fig. 2 shows the flow chart according to the combining transmission method of the another kind of uni-cell MBMS of second embodiment of the invention.As shown in Figure 2, said method comprising the steps of: for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions (S201); With set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s (S202); The UE of decoding SINR between described retransmission threshold value sends feedback signal (S203) in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S204); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S205) of angle DoA; And judge whether there is UE (S206) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S203 and proceed emission according to the embodiment of the invention.Wherein, described retransmission threshold value can be effective signal-to-noise ratio SINR threshold value.
Fig. 3 shows the flow chart according to the combining transmission method of the uni-cell MBMS of third embodiment of the invention.Described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.As shown in Figure 3, said method comprising the steps of: use the antenna at the edge of antenna array to carry out initial transmissions (S301); , set in advance effective signal-to-noise ratio SINR threshold value by eNB, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent it back whole interested MBMS user equipment (UE)s (S302) when setting in advance retransmission threshold value described; The UE of decoding SINR between described retransmission threshold value sends feedback signal (S303) in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S304); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S305) of angle DoA; And judge whether there is UE (S306) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S303 and proceed emission according to the embodiment of the invention.
Fig. 4 shows the flow chart according to the combining transmission method of the uni-cell MBMS of fourth embodiment of the invention.Described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.As shown in Figure 4, said method comprising the steps of: use the antenna at the edge of antenna array to carry out initial transmissions (S401); Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s (S402); At UE receiver place, the UE of decoding SINR between described retransmission threshold value beams back feedback signal (S403) to e-NB; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S404); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S405) of angle DoA; And judge whether there is UE (S406) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S403 and proceed emission according to the embodiment of the invention.
Fig. 5 shows the flow chart according to the combining transmission method of the uni-cell MBMS of fifth embodiment of the invention.Described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.As shown in Figure 5, said method comprising the steps of: use the antenna at the edge of antenna array to carry out initial transmissions (S101); Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s (S102); The UE of decoding SINR between described retransmission threshold value sends feedback signal (S103) in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S104); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S105) of angle DoA based on maximum-minimum principle; And judge whether there is UE (S106) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S103 and proceed emission according to the embodiment of the invention.
Fig. 6 shows the flow chart according to the combining transmission method of the uni-cell MBMS of sixth embodiment of the invention.Described combining transmission method can be regarded as Open-Loop Transmit Diversity, based on the combination of the BF of DoA operation and HARQ.As shown in Figure 6, said method comprising the steps of: for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions (S601); , set in advance effective signal-to-noise ratio SINR threshold value by eNB, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent it back whole interested MBMS user equipment (UE)s (S602) when setting in advance retransmission threshold value described; At UE receiver place, the UE of decoding SINR between described retransmission threshold value beams back feedback signal (S603) to e-NB; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA (S604); For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation (S605) of angle DoA based on maximum-minimum principle; And judge whether there is UE (S606) between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S103 and proceed emission according to the embodiment of the invention.
According to a seventh embodiment of the invention, also proposed a kind of base station of carrying out the mixed transport of uni-cell MBMS, following steps are carried out in described base station: use the antenna at the edge of antenna array of base station to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA at the place, base station; For again emission, use whole transmitting antennas of base station to carry out reaching based on ripple the beam forming BF operation of angle DoA; And if between described threshold value, do not have UE, then get back to the initial transmissions step.
According to the eighth embodiment of the present invention, a kind of user equipment (UE) that carries out the mixed transport of uni-cell MBMS has also been proposed, described subscriber equipment is carried out following steps: use the antenna at the edge of antenna array to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA at the e-NB place; For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation of angle DoA; And if between described threshold value, do not have UE, then get back to the initial transmissions step.
In order further to verify the beneficial effect of the inventive method, corresponding system emulation result and analysis thereof have below been provided.
Table 1 has provided related system and link level simulation parameter.
Table 1: system and link level simulation parameter
Figure GPA00001109623400091
Figure GPA00001109623400101
When emulation, suppose whole UE in whole sector at random and equably scattering.Do not consider the interference of neighbor cell.Suppose that a Transmission Time Interval TTI comprises 12 OFDM symbols with larger CP length.Can select various modulation and chnnel coding group.When emulation, use QPSK and 1/2turbo.For HARQ, supposed 5 TTI feedback delays, and carried out the synchronous HARQ operation at the e-NB place.There are 2 reception antennas with 10 wavelength intervals at whole UE places, therefore do not need to consider the reception antenna spatial coherence.Exist many algorithms to be used to estimate DoA, but when emulation, use desirable DoA value.With calculating effective SINR from link level to system-level EESM mapping algorithm.
For not utilizing HARQ (to represent with " wo " among the figure, for utilizing the using in the drawings of HARQ " w " expression) 2 emissions, 2 reception antennas (with " 2 * 2 " expression) SFBC, effectively the cumulative distribution function (CDF) of SINR is at first shown in Figure 8 as the basis.
Fig. 8 clearly show that for 2 * 2 O-SFBC that do not utilize HARQ effectively the interval of SINR is being under 90% the covering working point between [25～15] dB.In order to compare with hybrid plan of the present invention, namely with 4 * 2/8 * 2 BF that utilize HARQ with do not utilize 2 * 2 O-SFBC of HARQ to compare, when emulation, be [23～16] dB with the SINR Threshold, require also can select other wider threshold values for different coverings.Simultaneously, 2 * 2 O-SFBC that utilize HARQ have also been carried out emulation in order to compare.In Fig. 9～Figure 11, provided respectively the accordingly result for each 6,10 and 14 UE in residential quarter.
From Fig. 9～Figure 11, can find out, because broadcast/multi broadcast needs the coverage cell edge, for MBMS emphasis be concentrated on 90% covering working point.The advantage of comparing with other schemes according to the hybrid plan of the embodiment of the invention is two aspects: on the one hand, compare with 2 * 2 O-SFBC that do not utilize HARQ for 4 * 2/8 * 2 BF that utilize HARQ, improved SINR; On the other hand, compare with 2 * 2 O-SFBC that utilize HARQ according to the scheme of the embodiment of the invention, reduced average repeat time.
For the ease of comparing, in table 2, illustrated when utilizing 4 * 2/8 * 2 BF to compare with 2 * 2 SFBC that utilize HARQ and reduced average repeat time, also show 6,10 with the situation of 14 UE under effective SINR gain of comparing with 2 * 2 SFBC schemes of not utilizing HARQ.
Table 2: the performance improvement of new BF scheme
Figure GPA00001109623400111
As can be seen from Table 2, in the situation of 3 kinds of user's numbers, 4x2 BF w HARQ compares average re-transmission number with 2x2 SFBC w HARQ and has reduced about 30%; 8x2 BF w HARQ compares with 2x2 SFBC w HARQ and has reduced 33%～37%.Simultaneously, compare with 2x2 SFBC w HARQ, obtained effective SINR of 4.3～4.5dB.The advantage of new BF scheme is mainly owing to following reason produces: formed narrower wave beam, and the aiming of total transmitting power has the UE of minimum SINR, therefore improved the poorest UE receptivity by re-transmission.Verified this new BF operation is a kind of very effective scheme, and can be used for replacing the re-transmission that utilize transmit diversity.
One of ordinary skill in the art will appreciate that: all or part of step of implementing in above-described embodiment method can come the relevant hardware of instruction to finish by program, described program can be stored in the computer-readable recording medium, carries out following steps when carrying out this program: use the antenna at the edge of antenna array to carry out initial transmissions; Set in advance retransmission threshold value, described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s; The UE of decoding SINR between described retransmission threshold value sends feedback signal in the UE receiver place; At the e-NB place, use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA; For again emission, use whole transmitting antennas to carry out reaching based on ripple the beam forming BF operation of angle DoA; And judge whether there is UE between the described threshold value, if between described threshold value, there is not UE, then get back to the initial transmissions step, if exist then get back to step S103 and proceed emission according to the embodiment of the invention, described storage medium can be the storage mediums such as ROM/RAM, disk, CD.
Major advantage according to the described method of the embodiment of the invention, base station and subscriber equipment is: owing to use open loop SFBC and SINR threshold value for initial transmissions, greatly reduce the uplink feedback expense; For initial transmissions, as shown in Figure 7, in the situation of 4 transmitting antennas, use the first and the 4th antenna, in the situation of 8 transmitting antennas, use the first and the 8th antenna, because the wider antenna distance in e-NB place has reduced the impact of spatial coherence for transmit diversity effectively; Compare with the prior art that is used for SC MBMS, owing to will only be used for again emission based on the BF algorithm of DoA, according to this hybrid plan easier realization in real system of the embodiment of the invention, and described scheme can be applied to any number of transmit antennas; When making up with HARQ, be applicable to again launch based on the DoA of BF, and target is the UE of worst condition among those UE that beam back signal.As a result, improve widely the receptivity of worst condition UE, but do not had the cost that deteriorates to other UE performances.
When HARQ was used for SC MMBS, this hybrid plan had been to be easy to all have very attracting characteristic aspect realization and the performance improvement.Therefore, this scheme according to the present invention can be recommended as the alternative technique scheme of following LTE+ or 4G system.
Although illustrated and described some embodiments of the present invention, but those of ordinary skills are to be understood that, in the situation that does not break away from the principle and scope of the present invention that claims and equivalent thereof limit, can in to above embodiment, make variation.

Claims (15)

1. combining transmission method that is used for single-cell multimedia broadcast multicast service MBMS comprises:
Use the antenna at the edge of antenna array of eNB to carry out initial transmissions;
Set in advance retransmission threshold value at the eNB place, and described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s, in order to send feedback signal at the UE of decoding signal to noise ratio SINR in UE receiver place between described retransmission threshold value;
Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA at the eNB place;
For again emission, use whole transmitting antennas of eNB to carry out reaching based on ripple the beam forming BF operation of angle DoA; And
When not having UE between described threshold value, eNB carries out initial transmissions.
2. combining transmission method according to claim 1, wherein for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions.
3. combining transmission method according to claim 1. wherein said retransmission threshold value is effective signal-to-noise ratio SINR threshold value.
4. combining transmission method according to claim 3, wherein described when setting in advance retransmission threshold value, set in advance effective signal-to-noise ratio SINR threshold value by eNB, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent to whole interested MBMS user equipment (UE)s.
5. combining transmission method according to claim 1 wherein for again emission, uses whole transmitting antennas of eNB to carry out reaching based on ripple the beam forming BF operation of angle DoA based on maximum-minimum principle.
6. base station of carrying out the mixed transport of single-cell multimedia broadcast multicast service MBMS, described base station comprises antenna array, wherein:
Described base station uses the antenna at the edge of described antenna array to carry out initial transmissions;
The place sets in advance retransmission threshold value in described base station, and described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s, in order to send feedback signal at the UE of decoding signal to noise ratio SINR in UE receiver place between described retransmission threshold value;
The place uses whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA in described base station;
For again emission, use whole transmitting antennas of described base station to carry out reaching based on ripple the beam forming BF operation of angle DoA; And
When not having UE between described threshold value, initial transmissions is carried out in described base station.
7. base station according to claim 6, wherein for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions.
8. base station according to claim 6, wherein said retransmission threshold value is effective signal-to-noise ratio SINR threshold value.
9. base station according to claim 8, wherein described when setting in advance retransmission threshold value, set in advance effective signal-to-noise ratio SINR threshold value by described base station, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent to whole interested MBMS user equipment (UE)s.
10. base station according to claim 6 wherein for again emission, uses whole transmitting antennas of described base station to carry out reaching based on ripple the beam forming BF operation of angle DoA based on maximum-minimum principle.
11. a combining transmission method that is used for single-cell multimedia broadcast multicast service MBMS comprises:
Use the antenna at the edge of antenna array of base station to carry out initial transmissions;
Set in advance retransmission threshold value in the base station, and described retransmission threshold value is sent to whole interested MBMS user equipment (UE)s, in order to send feedback signal at the UE of decoding signal to noise ratio SINR in UE receiver place between described retransmission threshold value;
Use whole reception antennas to estimate that those ripples of having beamed back the UE of feedback signal reach angle DoA in the base station;
For again emission, use whole transmitting antennas of base station to carry out reaching based on ripple the beam forming BF operation of angle DoA; And
When not having UE between described threshold value, initial transmissions is carried out in the base station.
12. combining transmission method according to claim 11, wherein for described initial transmissions, the antenna at the edge of described antenna array uses full rate and full-diversity quadrature space-frequency block codes O-SFBC to carry out initial transmissions.
13. combining transmission method according to claim 11, wherein said retransmission threshold value are effective signal-to-noise ratio SINR threshold values.
14. combining transmission method according to claim 13, wherein described when setting in advance retransmission threshold value, the base station sets in advance effective signal-to-noise ratio SINR threshold value, and described pre-configured effective signal-to-noise ratio SINR threshold value is sent to whole interested MBMS user equipment (UE)s.
15. combining transmission method according to claim 11 wherein for again emission, uses whole transmitting antennas of base station to carry out reaching based on ripple the beam forming BF operation of angle DoA based on maximum-minimum principle.
CN200880129933.3A 2008-08-07 2008-08-07 Mixed transmission method, base station and user equipment in single cell MBMS Active CN102067686B (en)

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CN2899297Y (en) * 2006-04-18 2007-05-09 王烈 Radio transmitter based on housing estate broadcasting technology
CN101222256A (en) * 2007-01-09 2008-07-16 中兴通讯股份有限公司 Method for transmitting multimedia broadcast multicast service using multi-antenna system

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CN2899297Y (en) * 2006-04-18 2007-05-09 王烈 Radio transmitter based on housing estate broadcasting technology
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