CN101534176A - Self-adaptive antenna mode control method and device thereof - Google Patents
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Abstract
The invention provides a self-adaptive antenna mode control method and a device thereof. The method is characterized by comprising an external ring control process and an internal ring control process. The external ring control process comprises the steps of: setting an aggregate value threshold and a successive value threshold and judging whether the aggregate statistic value of confirmation or denial information is larger than the aggregate value threshold, if so, directly switching the antenna mode; if not, judging whether the successive statistic value of the confirmation or denial information is larger than the successive value threshold, if so, entering the internal ring control process, and if not, keeping the current antenna mode. The internal ring control process comprises the steps of: carrying out return treatment under a plurality of antennas according to channel quality instructions fed back by different user terminals and an interface table of link layer simulated true values, and determining the antenna mode and a code modulation mode selected by the target user terminal according to the rule of throughput maximization. The invention effectively solves self adaptive selection problem of different antenna modes in an MIMO system and can obtain optimum system performance.
Description
Technical field
The present invention relates to the self-adaptation control method of antenna mode in the multiaerial system, relate in particular to self-adaptive antenna mode control method and device in OFDM, the multi-input multi-output system.
Background technology
MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) combination of technology can significantly improve the link-quality of wireless communication system, improve the transmission rate of wireless data, therefore, this technology also become 4G (the 4th third-generation mobile communication) system the main technology that adopts.
Consider that based on transmission architecture the MIMO technology mainly comprises three kinds of antenna modes: spatial reuse (SM, Spatial Multiple), transmit diversity (TD, Transmission Division) and wave beam forming (BF, Beam Forming).Under the environment intensive at multipath, that channel relevancy is lower, SM is effective patterns, can obtain the highest transmission rate, and adopts the TD pattern, can obtain optimum link-quality, improves the signal to noise ratio of demodulation; Under the complete correlation circumstance of channel, the BF pattern can reduce transmitted power, and expanding transmission distance improves transmission quality.Therefore, above-mentioned three kinds of antenna modes need to carry out balance in actual applications to be considered, a kind of effective method be carry out between the different antennae pattern according to concrete ability and channel circumstance adaptively selected, thereby obtain optimum system performance under the varying environment.
Chinese patent application CN200580019553.0, the patent disclosure of publication number CN1969473A a kind of " apparatus and method of control transmission pattern in the multiple-input and multiple-output mobile communication system ", be included in and add the error checking device in the mimo system, the output error check results, the threshold values that feedback fraction is associated with channel status according to the error check result adaptively changing, and by the threshold values that relatively changed and CQI (the Channel Quality Indicator of measurement, the channel quality indication) determine transmission mode, and to transmitter feedback transmission pattern information.
But this patent fails to propose the interior ring control of model selection and the method that outer shroud control combines, only rely on (Acknowledgement to ACK, acknowledge message) and NACK (Negative Acknowledgement, deny message) statistics control the comparison of threshold values, increased the time delay of mode switch.And do not relate to the rollback problem of CQI value of feedback under multi-antenna mode, can introduce error bigger in the control.
Therefore, the method that prior art need provide different antennae pattern control in a kind of MIMO-OFDM system and select, can be according to BS (Base Station, the base station), UE (User Equipment, subscriber equipment) the adaptively selected multiplexing and diversity mode of ability and actual channel condition distributes antenna mode or means thereby improve existing fixed.
Summary of the invention
The purpose of this invention is to provide a kind of self-adaptive antenna mode control method and device, solving prior art can not be according to the ability of base station and subscriber equipment and the technical problem of coming adaptively selected antenna mode according to actual channel condition.
To achieve these goals, the invention provides a kind of self-adaptive antenna mode control method, wherein, comprise: the outer shroud control procedure: aggregate-value thresholding and successive value thresholding are set, judge that the cumulative statistics value of confirming/deny information whether greater than the aggregate-value thresholding, is the switching of then directly carrying out antenna mode; Otherwise whether judge the continuum evaluation of confirming/deny information greater than the successive value thresholding, the ring control procedure then keeps current antenna mode less than the successive value thresholding in then entering greater than the successive value thresholding; In the ring control procedure: be worth the interface table really according to the channel quality indication (CQI) information of different user terminals feedback and link layer emulation and carry out rollback processing many antennas under, determine target terminal user antenna mode to be selected and modulation coding mode with the throughput maximal criterion.
Above-mentioned method wherein, in the described interior ring control procedure, is determined target terminal user pairing modulation coding mode under the different antennae pattern by described rollback processing; Described throughput maximal criterion comprises: the flow size of more described target terminal user under the different antennae pattern, and for described target terminal user is selected the antenna mode of flow maximum and the modulation coding mode of correspondence.
Above-mentioned method, wherein, in described outer shroud control procedure,
At current antenna mode is under the condition of diversity mode, if the cumulative statistics value of described confirmation greater than described aggregate-value thresholding, then current antenna mode switches to multiplexer mode immediately; If the cumulative statistics value of described confirmation is less than described aggregate-value thresholding, and the continuum evaluation of described confirmation then switches to described interior ring control procedure greater than described successive value thresholding;
At current antenna mode is under the condition of multiplexer mode, if the described cumulative statistics value of denying information greater than described aggregate-value thresholding, then current antenna mode switches to diversity mode immediately; If the described cumulative statistics value of denying information is less than described aggregate-value thresholding, and the described continuum evaluation of denying information then switches to described interior ring control procedure greater than described successive value thresholding.
Above-mentioned method wherein, is under the condition of multiplexer mode at current antenna mode, and described interior ring control procedure comprises:
Step a, the channel quality indication (CQI) information that the base station reports according to different user terminals, determine to distribute to the Resource Block of target terminal user, and determine under multiplexer mode, to distribute to the pairing modulation coding mode of various flows in the Resource Block of described target terminal user;
Step b, the modulation coding mode of throughput maximum of selecting to make stream in the pairing modulation coding mode of described various flows is as the maximum modulation coded system;
Step c is worth the interface table really according to described maximum modulation coded system and link layer emulation, obtains under diversity mode the pairing modulation coding mode of described target terminal user as the diversity modulation coding mode in conjunction with the diversity backoff algorithm;
Steps d, under the condition of distributing same resource block, obtain all various flows of described target terminal user under multiplexer mode flow and value, and described target terminal user adopts the monodrome of the flow under the described diversity modulation coding mode under diversity mode, if described and the value greater than described monodrome, then described target terminal user adopts multiplexer mode and adopt the pairing modulation coding mode of various flows that obtains in step a, if described and value is less than described monodrome, then described target terminal user adopts diversity mode and described diversity modulation coding mode.
Above-mentioned method, wherein, described step c comprises:
Step c1, the link layer emulation of searching the multi-antenna diversity in the base station is worth the interface table really, in the diversity district of this interface table,, search the signal to noise ratio SIR ' of described target terminal user under diversity mode according to the condition of described maximum modulation coded system and block error rate BLER=10%;
Step c2 calculates the signal to noise ratio SIR after diversity compensates, SIR=SIR '+3dB;
Step c3, the signal to noise ratio SIR according to after the compensation of block error rate BLER=10% and diversity searches described interface table again, obtains under diversity mode the pairing modulation coding mode of described target terminal user as the diversity modulation coding mode.
Above-mentioned method wherein, is under the condition of diversity mode at current antenna mode, and described interior ring control procedure comprises:
Step a, the channel quality indication (CQI) information that the base station reports according to different user terminals, determine to distribute to the Resource Block of target terminal user, and determine under multiplexer mode, to distribute to pairing modulation coding mode of various flows in the Resource Block of described target terminal user and the diversity modulation coding mode that Resource Block adopted of under diversity mode, distributing to described target terminal user;
Step b, under the condition of distributing same resource block, obtain all various flows of described target terminal user under multiplexer mode flow and value, and under diversity mode described target terminal user in the monodrome that adopts the flow under the described diversity modulation coding mode, if described and the value greater than described monodrome, the pairing modulation coding mode of various flows that then described target terminal user adopts multiplexer mode and obtains in step a, if described and value is less than described monodrome, then described target terminal user adopts diversity mode and described diversity modulation coding mode.
Above-mentioned method wherein, also comprises: the base station is notified described target terminal user with the selection result of antenna mode by down control channel.
To achieve these goals, the present invention also provides a kind of adaptive antenna mode control device, wherein, comprise: the outer shroud control unit, be used for: aggregate-value thresholding and successive value thresholding are set, judge that the cumulative statistics value of confirming/deny information whether greater than the aggregate-value thresholding, is the switching of then directly carrying out antenna mode; Otherwise whether judge the continuum evaluation of confirming/deny information greater than the successive value thresholding, the control procedure of ring control unit then keeps current antenna mode less than the successive value thresholding in then entering greater than the successive value thresholding; Interior ring control unit, be used for: be worth the interface table really according to the channel quality indication (CQI) information of different user terminals feedback and link layer emulation and carry out rollback processing many antennas under, determine target terminal user antenna mode to be selected and modulation coding mode with the throughput maximal criterion.
Above-mentioned device, wherein, the described backoff algorithm that the ring control unit is carried out in described comprises: determine target terminal user pairing modulation coding mode under the different antennae pattern, determine described target terminal user antenna mode to be selected and modulation coding mode by the flow size of comparison object user terminal under the different antennae pattern.
Above-mentioned device wherein, also comprises: mode switch element is used for switching according to described outer shroud control unit and the described interior selection result of encircling the antenna mode of control unit; Measure and feedback unit, be used to feed back described channel quality indication (CQI) information; Scheduler is used to carry out the distribution of Resource Block.
Technique effect of the present invention is:
1. effectively solve the adaptively selected problem of different antennae pattern in the mimo system, obtained optimum systematic function.
2. the method that adopts outer shroud control and the control of interior ring to combine on the one hand, under the slow situation of channel conversion, can be avoided frequent mode switch, reduces overhead; On the other hand, but real-time tracking channel conversion is again adjusted code modulation mode and the transmitting antenna pattern of BS, thus the variation of adaptive channel rapidly.
3. adopt the backoff algorithm under many antennas, avoided traditional utilize directly that single antenna link simulation result carries out that MCS under many antennas (Modulation and Coding Scheme, modulation coding mode) select to introduce than mistake.
In a word, the present invention carries out the scheme that antenna mode is selected by outer shroud and interior ring control algolithm in a kind of 4G system, can make the 4G system accurately to obtain current channel condition with less resource overhead, and the sending mode that changes BS of adaptive channel carries out choose reasonable rapidly, finally obtains the throughput performance of system optimal.
Description of drawings
Fig. 1 is outer, the interior ring control principle block diagram of multiaerial system provided by the invention;
Fig. 2 is that adaptive multi-antenna mode selecting method provided by the invention is by multiplexing concrete switching flow figure to diversity;
Fig. 3 is an adaptive multi-antenna mode selecting method provided by the invention by diversity to multiplexing concrete switching flow figure.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The present invention mainly comprises: outer shroud control procedure and interior ring control procedure.Outer shroud control is statistics UT (User Terminal, user terminal) the ACK/NACK information that reports continuously, and this information compared with desired value, thereby the MIMO pattern to be switched and selected, outer shroud control is used for the antenna mode under longer a period of time stable channels is carried out direct-cut operation.Interior ring control is to report various flows (under the diversity mode by UT, can think special multithread) feedback information of CQI, after BS does suitable processing to CQI information, search AVI (the Assured ValueInterface of link simulation under single antenna AWGN (additive white Gaussian noise), really be worth interface) table, and in conjunction with the backoff algorithm under the multipath channel environment selective value is carried out certain rollback and handle, determine suitable MIMO antenna mode then, therefore, interior ring control can be carried out the selection of real-time to antenna mode according to the CQI feedback.
The inventive method comprises the steps:
A) at first multi-antenna mode is selected at the base station end by the outer shroud algorithm, the core of outer shroud algorithm is to safeguard an ACK and NACK counter by MAC (medium access control) layer, statistics BS current time to the last mode switch is received ACK and the NACK quantity that UE reports between the finish time, statistics is divided into two classes: aggregate-value and successive value, this quantity have reflected the variation tendency of channel in a period of time.
B) MAC layer counters count value is compared with accumulative total thresholding and continuous thresholding respectively, carry out the outer shroud antenna mode according to comparative result by the base station and select to judge, when statistical value reaches the accumulative total thresholding, just carry out outer shroud at once and switch, otherwise, ring control procedure in entering.
C) ring control at first needs according to the comparative result of ACK/NACK statistical value with continuous thresholding in, judges whether that the MCS that carries out the same antenna mode internal selects control, or the switching controls between execution pattern.
No matter the interior MCS of antenna mode selects still to switch between pattern, all at first needs to obtain the CQI feedback information of UE.In the real system, UE can feed back to BS with appropriate format with the code modulation mode of various flows on the different resource piece, and BS carries out preassignment according to the CQI feedback and in conjunction with the MAC layer scheduling algorithm to the resource of object UE.
D) if switch between the pattern of interior ring control, BS is then according to the throughput maximal criterion, and the backoff algorithm under junction link layer emulation AVI result and the many antennas, determines the MCS that object UE can support and the pattern of transmitting antenna.
E) BS passes through down control channel notification target UE with the antenna mode selection result.
Below in conjunction with accompanying drawing, be described in more detail.
Multiple antenna mode self-adaptive system of selection of the present invention by the uplink feedback information (ACK/NACK, CQI) of UT, divides outer shroud and interior ring to carry out antenna mode by BS and selects, and as shown in Figure 1, concrete execution in step is as follows:
1) BS at first carries out the outer shroud control procedure, ACK and NACK quantity that statistics mode switch last time is received to MAC layer between the current time finish time, wherein ACK and NACK aggregate-value are expressed as respectively: ACCUMack and ACCUMnack, the statistical value of receiving ACK and NACK continuously is respectively CONTIack and CONTInack, and the aggregate-value thresholding that system determines is η
Accum, the successive value thresholding is η
Conti
2) BS carries out analysis and judgement to statistical value, if the aggregate-value of statistics greater than the aggregate-value thresholding, is then switched the pattern of antenna by outer shroud control at once, that is, if current antenna mode of operation is a diversity mode, and ACCUMack η
Accum, then antenna mode is switched to multiplexer mode; If current antenna mode is a multiplexer mode, and ACCUMnack〉η
Accum, then at once antenna mode is switched to diversity mode.Wherein the MCS of different mode determines mode, needs further to be selected by interior ring control.
3) when the aggregate-value of the above-mentioned second step statistics during, also need further to judge the continuum evaluation situation of ACK/NACK less than thresholding.If the continuum evaluation is less than successive value thresholding η
Conti, just keep original antenna mode constant, on the contrary, if continuum evaluation CONTI〉η
Conti, the ring control procedure is carried out selection between antenna mode by interior ring control algolithm in then entering.Concrete interior ring control algolithm below will provide detailed introduction.
4) BS sends to object UE with the antenna mode selection result by down control channel.
In the outer shroud control procedure, if current antenna mode of operation is a multiplexer mode, and CONTInack η
Conti, then carry out the multiplexing handoff procedure of interior ring as shown in Figure 2 to diversity; If current antenna mode of operation is a hierarchical pattern, and CONTIack〉η
Conti, then execution interior ring diversity as shown in Figure 3 is to multiplexing handoff procedure.
As shown in Figure 2, the multiplexing of interior ring comprises to the diversity handoff procedure:
UE feedback information under table 1 multiplexer mode
Step 204 selects to make the MCS of throughput maximum, i.e. MCS=MAX (MCS1, MCS2.....) in the various flows of object UE
Step 205 is searched the AVI table under the many antennas AWGN among the BS, according to BLER=10% and MCS condition, obtains the SIR ' of this UE under diversity mode in the diversity district.
Step 206 adopts the diversity backoff algorithm, calculates the SIR of diversity mode after compensation, i.e. SIR=SIR '+3dB.
Step 207 according to the SIR after BLER=10% and the diversity compensation, is searched the AVI table of multi-antenna diversity again, obtains the MCS under the diversity mode.
Step 208 is judged under identical RB distribution condition, the throughput size of the MCS of this UE employing diversity mode and the MCS ' of multiplexer mode.If the throughput of diversity mode is big, that is, ThMCS〉ThMCS1+ThMCS2+ThMCS3+....., then switch to diversity mode, this moment, the code modulation mode of all streams was identical, and the MCS that adopts step 208 to obtain; Otherwise, keeping multiplexer mode, this moment, various flows corresponding codes modulation system adopted step 204 to obtain the corresponding MCS ' (MCS1, MCS2.....) of each stream.
As shown in Figure 3, interior ring diversity to multiplexing handoff procedure comprises:
UE feedback information under table 2 diversity mode
To sum up.The inventive method can be following step comprehensively with the adaptively selected control method of the different mode of whole multi-input multi-output antenna system: 1. outer shroud control procedure, by statistics, the antenna mode that becomes slowly under the channel in a period of time is controlled accumulative total and continuous ACK/NACK; 2. be lower than the accumulative total thresholding and during greater than thresholding continuously, the ring control procedure is carried out model selection by interior ring control algolithm in entering when the statistical magnitude of ACK/NACK; 3. the ring control procedure is at first obtained the CQI feedback information of UE in; 4. BS is according to the CQI feedback of UE, and the AVI of junction link emulation shows, and carries out certain rollback and handle, and determines next antenna transmission pattern constantly; 5. BS notifies UE with the antenna mode handover information by down control channel.
In addition, corresponding the inventive method, the present invention also provides a kind of adaptive antenna mode control device, as shown in Figure 1, control device comprises: outer shroud control unit 101, be used for: aggregate-value thresholding and successive value thresholding are set, judge that the cumulative statistics value of confirming/deny information whether greater than the aggregate-value thresholding, is the switching of then directly carrying out antenna mode; Otherwise whether judge the continuum evaluation of confirming/deny information greater than the successive value thresholding, the control procedure of ring control unit then keeps current antenna mode less than the successive value thresholding in then entering greater than the successive value thresholding; Interior ring control unit 102, be used for: be worth the interface table really according to the channel quality indication (CQI) information of different user terminals feedback and link layer emulation and carry out rollback processing many antennas under, determine target terminal user antenna mode to be selected and modulation coding mode with the throughput maximal criterion; Mode switch element 103 is used for switching according to described outer shroud control unit and the described interior selection result of encircling the antenna mode of control unit; Measure and feedback unit 104, be used to feed back described channel quality indication (CQI) information; Scheduler 105 is used to carry out the distribution of Resource Block.
The invention solves multi-input multi-output antenna system and be badly in need of the selection control problem of the multiple antenna mode that solves in actual applications, and have following characteristics: 1. adopt the outer shroud control method, avoid becoming slowly the frequent antenna mode selection of carrying out under the channel, reduced overhead; 2. ring control method in adopting makes and the variation of adaptive channel rapidly of model selection algorithm according to the adaptively selected suitable antenna mode of CQI feedback information, has improved the throughput performance of system; 3. to the AVI table of single antenna link simulation, under multi-antenna mode, carry out the rollback processing, reduced the error in the pattern control.
But should be understood that above-mentioned description at preferred embodiment of the present invention is comparatively concrete, can not therefore think restriction scope of patent protection of the present invention.The present invention is applicable to the communication system that all adopt multi-input/output antenna, and scope of patent protection should be as the criterion with claims.Therefore.The above only is a preferred implementation of the present invention, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, and these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a self-adaptive antenna mode control method is characterized in that, comprising:
Outer shroud control procedure: aggregate-value thresholding and successive value thresholding are set, judge that the cumulative statistics value of confirming/deny information whether greater than the aggregate-value thresholding, is the switching of then directly carrying out antenna mode; Otherwise whether judge the continuum evaluation of confirming/deny information greater than the successive value thresholding, the ring control procedure then keeps current antenna mode less than the successive value thresholding in then entering greater than the successive value thresholding;
In the ring control procedure: be worth the interface table really according to the channel quality indication (CQI) information of different user terminals feedback and link layer emulation and carry out rollback processing many antennas under, determine target terminal user antenna mode to be selected and modulation coding mode with the throughput maximal criterion.
2. method according to claim 1 is characterized in that, in the described interior ring control procedure, determines target terminal user pairing modulation coding mode under the different antennae pattern by described rollback processing; Described throughput maximal criterion comprises: the flow size of more described target terminal user under the different antennae pattern, and for described target terminal user is selected the antenna mode of flow maximum and the modulation coding mode of correspondence.
3. method according to claim 1 is characterized in that, in described outer shroud control procedure,
At current antenna mode is under the condition of diversity mode, if the cumulative statistics value of described confirmation greater than described aggregate-value thresholding, then current antenna mode switches to multiplexer mode immediately; If the cumulative statistics value of described confirmation is less than described aggregate-value thresholding, and the continuum evaluation of described confirmation then switches to described interior ring control procedure greater than described successive value thresholding;
At current antenna mode is under the condition of multiplexer mode, if the described cumulative statistics value of denying information greater than described aggregate-value thresholding, then current antenna mode switches to diversity mode immediately; If the described cumulative statistics value of denying information is less than described aggregate-value thresholding, and the described continuum evaluation of denying information then switches to described interior ring control procedure greater than described successive value thresholding.
4. method according to claim 1 is characterized in that, is under the condition of multiplexer mode at current antenna mode, and described interior ring control procedure comprises:
Step a, the channel quality indication (CQI) information that the base station reports according to different user terminals, determine to distribute to the Resource Block of target terminal user, and determine under multiplexer mode, to distribute to the pairing modulation coding mode of various flows in the Resource Block of described target terminal user;
Step b, the modulation coding mode of throughput maximum of selecting to make stream in the pairing modulation coding mode of described various flows is as the maximum modulation coded system;
Step c is worth the interface table really according to described maximum modulation coded system and link layer emulation, obtains under diversity mode the pairing modulation coding mode of described target terminal user as the diversity modulation coding mode in conjunction with the diversity backoff algorithm;
Steps d, under the condition of distributing same resource block, obtain all various flows of described target terminal user under multiplexer mode flow and value, and described target terminal user adopts the monodrome of the flow under the described diversity modulation coding mode under diversity mode, if described and the value greater than described monodrome, then described target terminal user adopts multiplexer mode and adopt the pairing modulation coding mode of various flows that obtains in step a, if described and value is less than described monodrome, then described target terminal user adopts diversity mode and described diversity modulation coding mode.
5. method according to claim 4 is characterized in that, described step c comprises:
Step c1, the link layer emulation of searching the multi-antenna diversity in the base station is worth the interface table really, in the diversity district of this interface table,, search the signal to noise ratio SIR ' of described target terminal user under diversity mode according to the condition of described maximum modulation coded system and block error rate BLER=10%;
Step c2 calculates the signal to noise ratio SIR after diversity compensates, SIR=SIR '+3dB;
Step c3, the signal to noise ratio SIR according to after the compensation of block error rate BLER=10% and diversity searches described interface table again, obtains under diversity mode the pairing modulation coding mode of described target terminal user as the diversity modulation coding mode.
6. method according to claim 1 is characterized in that, is under the condition of diversity mode at current antenna mode, and described interior ring control procedure comprises:
Step a, the channel quality indication (CQI) information that the base station reports according to different user terminals, determine to distribute to the Resource Block of target terminal user, and determine under multiplexer mode, to distribute to pairing modulation coding mode of various flows in the Resource Block of described target terminal user and the diversity modulation coding mode that Resource Block adopted of under diversity mode, distributing to described target terminal user;
Step b, under the condition of distributing same resource block, obtain all various flows of described target terminal user under multiplexer mode flow and value, and under diversity mode described target terminal user in the monodrome that adopts the flow under the described diversity modulation coding mode, if described and the value greater than described monodrome, the pairing modulation coding mode of various flows that then described target terminal user adopts multiplexer mode and obtains in step a, if described and value is less than described monodrome, then described target terminal user adopts diversity mode and described diversity modulation coding mode.
7. according to any described method in the claim 1 to 6, it is characterized in that also comprise: the base station is notified described target terminal user with the selection result of antenna mode by down control channel.
8. an adaptive antenna mode control device is characterized in that, comprising:
The outer shroud control unit is used for: aggregate-value thresholding and successive value thresholding are set, judge that the cumulative statistics value of confirming/deny information whether greater than the aggregate-value thresholding, is the switching of then directly carrying out antenna mode; Otherwise whether judge the continuum evaluation of confirming/deny information greater than the successive value thresholding, the control procedure of ring control unit then keeps current antenna mode less than the successive value thresholding in then entering greater than the successive value thresholding;
Interior ring control unit, be used for: be worth the interface table really according to the channel quality indication (CQI) information of different user terminals feedback and link layer emulation and carry out rollback processing many antennas under, determine target terminal user antenna mode to be selected and modulation coding mode with the throughput maximal criterion.
9. device according to claim 8, it is characterized in that, the described backoff algorithm that the ring control unit is carried out in described comprises: determine target terminal user pairing modulation coding mode under the different antennae pattern, determine described target terminal user antenna mode to be selected and modulation coding mode by the flow size of comparison object user terminal under the different antennae pattern.
10. device according to claim 9 is characterized in that, also comprises:
Mode switch element is used for switching according to described outer shroud control unit and the described interior selection result of encircling the antenna mode of control unit;
Measure and feedback unit, be used to feed back described channel quality indication (CQI) information;
Scheduler is used to carry out the distribution of Resource Block.
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| CN102739342A (en) * | 2011-04-12 | 2012-10-17 | 中兴通讯股份有限公司 | Method of adaptive transmission mode and apparatus thereof |
| CN102811459A (en) * | 2011-06-03 | 2012-12-05 | 中兴通讯股份有限公司 | Resource optimization method and device |
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| CN100502254C (en) * | 2004-04-27 | 2009-06-17 | 北京邮电大学 | Self-adaptive modulation mode selection and power distribution method |
| JP4616338B2 (en) * | 2004-06-14 | 2011-01-19 | サムスン エレクトロニクス カンパニー リミテッド | Apparatus, system and method for controlling transmission mode in a mobile communication system using multiple transmit / receive antennas |
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| CN1976535A (en) * | 2006-12-12 | 2007-06-06 | 华为技术有限公司 | Channel adaptive device and channel adaptive method |
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