CN103023545A - Wireless data transmission method and network-side equipment - Google Patents
Wireless data transmission method and network-side equipment Download PDFInfo
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Abstract
The invention discloses a wireless data transmission method and a corresponding device, wherein network-side equipment comprises N antenna groups, N receiving and processing modules, a signal processing module, an antenna group selecting module and a sending and processing module, wherein N is an integer which is greater than or equal to 2, and each antenna group is only connected with one receiving and processing module; the wireless data transmission method is applied to a multiple-input multiple-output (MIMO) system, antenna array elements at a network side are divided into more than two antenna groups, each antenna group at least comprises one antenna array element, and in each data receiving period, and the network side executes the operations of: receiving data sent by a terminal in the MIMO system by using all local antenna array elements, and independently performing combination, demodulation and decoding processing on the data received by each antenna group; and selecting the antenna group used for sending downlink data, and sending the downlink data to the terminal by using the selected antenna group in a next data sending period.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of radio data transmission method and network equipment.
Background technology
In recent years, mobile subscriber's quantity increases sharply, and causes the wireless data service rapid growth.This has higher requirement to existing or following network coverage and the network capacity.How effectively to reduce the networking cost when promoting network performance, improving QoS of customer, be the problem that present radio communication must solve.
MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) is one of key technology that effectively addresses this problem.It all adopts many bays at network side and terminal, utilizes Spatial Dimension to improve the performance of wireless communication system.On the one hand, when there are many antenna elements in network side or terminal, and the data set that sends of each transmitting antenna is when identical, and receiving terminal merges the signal of a plurality of branches of receiving, thereby obtains space diversity gain, to improve the reliability of link; Certainly, also can be based on the adaptive antenna principle, utilize aerial array respectively each antenna element to be weighted processing by advanced person's signal processing algorithm, make aerial array aim in real time the direction of useful signal, and form zero point to suppress interference signal at interference radiating way, thereby the raising Signal to Interference plus Noise Ratio, the coverage of increase system.On the other hand, when there are many antennas in network side and terminal simultaneously, every transmitting antenna is to a channel is arranged between every reception antenna, these channels can equivalence become a plurality of parallel channels, thereby a plurality of different data flow of parallel transmission gain to obtain spatial reuse simultaneously on identical running time-frequency resource, thereby improve data transfer speed.
In general, the increase of number of antennas is conducive to improve the spatial degrees of freedom of MIMO, thereby improve the performance of wireless communication system, such as obtaining more space diversity gain, disturbing and suppress gain or spatial reuse gain, but also can increase complexity and the expense of system simultaneously, carry out merging or the demultiplexing of data flow such as the larger computation complexity of needs, need more pilot tone estimate channel coefficients.This just need to be optimized mimo system, when satisfying the performances such as large covering, high transfer rate, reduces complexity and expense.
In the data transmission scheme that adopts in existing mimo system, having promoted performance has increased complexity or has reduced complexity but be difficult to reach the needed performance of system, can't reach the balance of the two.
Summary of the invention
The invention provides a kind of radio data transmission method and network equipment, with resolution system performance and complexity the two can not balance problem.
For addressing the above problem, the present invention also provides a kind of radio data transmission method, be applied in multiple-input and multiple-output (MINO) system, the bay of network side is divided into the antenna sets more than 2, at least comprise a bay in each antenna sets, in cycle, described network side is carried out following operation at each data receiver:
Use local all bays to receive the data that the terminal in the described mimo system sends, and the data that respectively each antenna sets received merge separately, demodulation and decoding are processed;
Select to be used for sending the antenna sets of downlink data, and in next data transmitting period, use this antenna sets of selecting to send downlink data to described terminal.
Further,
Described each antenna sets adopts distributed arrangement mode or centralized arrangement mode.
Further,
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
Described network side selects signal to noise ratio, Signal to Interference plus Noise Ratio in the more than one antenna sets that the data that receive are correctly decoded, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data.
Further,
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
When the data that described network side receives in all antenna sets all can not be correctly decoded, in all antenna sets, select signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data, perhaps select the antenna sets of bit error rate, Packet Error Ratio or frame error rate minimum as described antenna sets for sending downlink data.
Further,
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
When downlink data to be sent was broadcast singal, described network side selected all antenna sets as described antenna sets for sending downlink data; Perhaps,
When downlink data to be sent is broadcast singal, described network side in all bays, select by front N root signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets that forms of the bay of received power maximum as described antenna sets for the transmission downlink data; Wherein, N is greater than 1 and less than the constant of the maximum transmitting antenna array element number of descending permission.
Further,
Described network side uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period, specifically comprises:
Described network side uses selected antenna sets to the described downlink data of direction directive sending of described terminal in next data transmitting period.
Correspondingly, the present invention also provides the network equipment in a kind of multiple-input and multiple-output (MINO) system, comprising: N antenna sets, a N receiving processing module, signal processing module, antenna sets are selected module and transmission processing module; Wherein, N is the integer more than or equal to 2, each antenna sets with and only link to each other with a receiving processing module;
At least comprise a bay in each antenna sets, be used for receiving in the cycle at each data receiver the data of the terminal transmission of described mimo system, and the data that each bay in this antenna sets receives are sent to the receiving processing module that links to each other with this antenna sets;
The data that each receiving processing module is used for that coupled antenna sets is sent merge separately, demodulation and decoding are processed, and the data after will processing send to described signal processing module;
Described signal processing module is used for receiving the treated data that described each receiving processing module is sent; Also be used for after the information of receiving the antenna sets of selecting that described antenna sets selection module is sent, notifying described transmission processing module;
Antenna sets selects module to be used for the described treated data that receive according to described signal processing module, selects to be used for sending the antenna sets of downlink data, and notifies described signal processing module with the information of the antenna sets selected;
Described transmission processing module uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period for the information of the described antenna sets of selecting of sending according to described signal processing module.
Further,
Described antenna sets selects module to select to be used for sending the antenna sets of downlink data, specifically comprises:
Described antenna sets selects module in the treated data that described signal processing module receives, select signal to noise ratio, Signal to Interference plus Noise Ratio in the more than one antenna sets of selecting to be correctly decoded, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data; Perhaps,
Described antenna sets selects module in the treated data that described signal processing module receives, in the situation that data all can not be correctly decoded, in all antenna sets, select signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data, perhaps select the antenna sets of bit error rate, Packet Error Ratio or frame error rate minimum as described antenna sets for sending downlink data.
Further,
Described antenna sets selects module to select to be used for sending the antenna sets of downlink data, specifically comprises:
When downlink data to be sent was broadcast singal, described antenna sets selected module to select all antenna sets as described antenna sets for sending downlink data; Perhaps,
When downlink data to be sent is broadcast singal, described antenna sets select module in all bays, selects by front M root signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets that forms of the bay of received power maximum as described antenna sets for the transmission downlink data; Wherein, M is greater than 1 and less than the constant of the maximum transmitting antenna array element number of descending permission.
Further,
Described transmission processing module uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period, specifically comprises:
Described transmission processing module uses selected antenna sets to the described downlink data of direction directive sending of described terminal in next data transmitting period.
The present invention increases with less complexity, has significantly improved the performance of system, has obtained larger diversity gain when effectively reducing complexity, thereby can increase considerably the coverage of system; By selecting the optimal antenna group to terminal directive sending data, can reduce the interference to other direction terminal, thereby reduce the interference level of whole system, promoted the performance of system.
Description of drawings
Fig. 1 is the structural representation of network equipment in the embodiment of the invention;
Fig. 2 is the method flow diagram that network equipment carries out data receiver in the embodiment of the invention;
Fig. 3 is that network equipment carries out the method flow diagram that data send in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing embodiments of the invention are elaborated.Need to prove that in the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
Comprise in the described wireless communication system of present embodiment: network side and terminal, network side include but not limited to comprise: base station, relay station or access point etc., terminal include but not limited to comprise: the equipment such as mobile phone, data card or notebook.
In the present embodiment, a kind of radio data transmission method is applied to comprise in the mimo system:
Step 10: network side is divided into antenna sets more than 2 with all bays on this equipment, comprises at least a bay in each antenna sets, and every bay only belongs to an antenna sets;
Step 20: the data that network side uses all antenna sets receiving terminals to send at each data receiver in the cycle, and the data of respectively each antenna winding being received merge separately, demodulation and decoding are processed;
Step 30: network side selects to be used for sending the antenna sets of downlink data, and uses this antenna sets of selecting to send downlink data in next data transmitting period.
Wherein, the network side antenna sets that select to be used for sends downlink data refers to: select signal to noise ratio, Signal to Interference plus Noise Ratio in the antenna sets that is correctly decoded, carry dried make an uproar than or the antenna sets of received power maximum as the antenna sets that is used for sending downlink data.Perhaps,
When the data that receive in all antenna sets all can not be correctly decoded, in all antenna sets, select signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or received power maximum, perhaps the antenna sets of bit error rate, Packet Error Ratio or frame error rate minimum is as the antenna sets that is used for sending downlink data.Perhaps,
When signal to be sent is broadcast singal, select all antenna sets for being used for sending the antenna sets of downlink data, perhaps, in all antennas, select before N root signal to noise ratio, Signal to Interference plus Noise Ratio, carry the bay of the dried ratio of making an uproar, received power maximum as the antenna sets that is used for the transmission downlink data; Wherein, N is greater than 1 and less than constant of maximum number of transmit antennas purpose of descending permission.
Preferably, select to carry out at the set period of each data receiver in the cycle for the process of the antenna sets that sends downlink data, (be 100 frames such as receiving cycle as only when the data receiver cycle arrives, just carrying out the antenna sets selection, that does not just carry out a day line options at the 1st～99 frame, only in the 100th frame, do the operation of day line options), perhaps add up each antenna sets in the cycle at data receiver and be selected as number of times for the antenna sets that sends downlink data, with number of times maximum be defined as the final antenna sets that is used for sending downlink data.
Preferably, network side sends downlink data to be sent and refers to by selected antenna sets: if data to be sent are not broadcast datas, then network side uses selected antenna sets to it is sent the direction directive sending downlink data of the above-mentioned terminal of upstream data.
Preferably, the information of this transmitting antenna group of selecting of other terminal of need to giving advance notice shared time/frequency source block when sending data, in order to avoid this time/frequency source block of other terminal to apply is (as opening RTS (Request To Send, request sends), CTS (Clear To Send allows to send)).
Wherein, time/frequency source block refers to that wireless communication system distributes to time-domain resource or frequency domain resource or the time frequency two-dimensional resources of this terminal in order to carry data, as at OFDM (Orthogonal Frequency Division Multiplexing, OFDM) or OFDMA (Orthogonal Frequency Division Multiple Access, the OFDM access) in the system, time/frequency source block takies one or more OFDM/OFDMA symbol in time domain, occupies one or multi-subcarrier at frequency domain.
Further, network side can carry out repeatedly data receiver at data receiver in the cycle; Can carry out repeatedly data in data transmitting period sends.
In the present embodiment, also comprise a kind of network equipment be used to carrying out digital received and sent, as shown in Figure 1, comprise at least with lower module:
N antenna sets module: each antenna sets module is used for receiving independently wireless signal and sends wireless signal, wherein, comprises at least one bay in each antenna sets module, N 〉=1;
N receiving processing module: each receiving processing module with and only be connected with an antenna sets module, with the wireless signal that coupled antenna sets module is received merge, demodulation and decoding, and the data that obtain after will decoding send to signal processing module;
The transmission processing module: all antenna sets share a transmission processing module, are used for processing the data that will send, and data are sent from the antenna sets of selecting.
Signal processing module: the decoded data of sending for the treatment of receiving processing module, with the transfer of data that is correctly decoded to the upper strata, i.e. MAC (Medium Access Control, media interviews control) layer; Also be used for control transmission processing module and only send downlink data by the antenna sets that antenna sets selects module to select to above-mentioned terminal;
Antenna sets is selected module: the signal message that receives according to each receiving processing module is identified for sending the antenna sets of downlink data, and the information of the antenna sets selected is notified to signal processing module.
The below uses example with one of the present invention and further specifies.
A wireless telecommunication system, network side have M * N root bay, are divided into M antenna sets, and N root bay is arranged in each antenna sets, and every bay only belongs to an antenna sets.Each antenna sets orientation sends data towards an orientation, but can receive the data from any orientation.The corresponding receiving processing module independently of each antenna sets can carry out the merging of many antennas, demodulation and decoding to the data that each bay in this antenna sets receives; All bays share a transmission processing module.As shown in Figure 2, in the cycle, as follows, the data that the terminal that is scheduled is sent receive network side at data receiver:
(1.1) network side utilizes each antenna sets to receive the data that this terminal sends;
(1.2) each antenna sets sends to the receiving processing module that links to each other with this antenna sets with the data that receive, by this receiving processing module to the data that receive merge, the processing such as demodulation and decoding;
(1.3) data that obtain after will decoding respectively of each receiving processing module send to signal processing module;
(1.4) signal processing module sends to upper layer module with the data that are correctly decoded, such as the MAC layer.And there is antenna sets to select module to select to be used for sending the antenna sets of downlink data.
A step of every execution (1.1)～(1.4) are called a receiving course, comprise at least one receiving course in each receiving cycle.
Network side data receiver in the cycle any one in the following way determine to send data antenna group:
Mode one:
In calculating last receiving course in this receiving cycle, the signal to noise ratio of the data that the antenna sets that is correctly decoded is received, selecting wherein, the antenna sets of signal to noise ratio maximum is the antenna sets for the transmission downlink data;
Mode two:
Calculate and add up in each receiving course in this receiving cycle, each antenna sets satisfies and to be correctly decoded and the number of times of maximum this condition of signal to noise ratio, then selects this number of times is maximum in this receiving cycle antenna sets as the antenna sets that is used for sending downlink data;
Mode three:
Signal to noise ratio or the bit error rate of each antenna sets in during last receiving course in this receiving cycle of calculating select the antenna sets of signal to noise ratio maximum or bit error rate minimum as the antenna sets that is used for sending downlink data;
Mode four:
Calculate and add up in each receiving course in this receiving cycle, each antenna sets satisfies the number of times of maximum this condition of signal to noise ratio, selects the maximum antenna sets of this number of times as the antenna sets that is used for sending downlink data;
Mode five:
Calculate and add up in each receiving course in this receiving cycle, each antenna sets satisfies the number of times of minimum this condition of bit error rate, selects the maximum antenna sets of this number of times for being used for sending the antenna sets of downlink data;
Mode six:
When data to be sent are broadcast, select all antenna sets as the antenna sets that is used for sending downlink data;
Mode seven:
The signal to noise ratio of all bays in calculating last receiving course in receiving cycle, the antenna sets of selecting to be comprised of the bay of top n signal to noise ratio maximum wherein is as the antenna sets that is used for the transmission downlink data.
Wherein, the signal to noise ratio in above-mentioned each mode can with Signal to Interference plus Noise Ratio, carry dried make an uproar than or the relevant parameter of weighing channel quality information such as received power replace; Bit error rate can be weighed with Packet Error Ratio or frame error rate etc. the relevant parameter replacement of receive data correctness.
As shown in Figure 3, network side is in data transmitting period, and as follows, the data of finishing each terminal that is scheduled send.
(3.1) signal processing module antenna sets that transmission processing module and antenna sets being used for of selecting that module selects sent downlink data connects;
(3.2) the transmission processing module is carried out the processing such as mapping that chnnel coding, modulation, data flow to layer and precoding to sent data;
(3.3) data after the transmission processing module will be processed send the antenna sets that is used for sending downlink data that connects with it to;
(3.4) be used for sending the antenna sets of downlink data by the transmission of the complete paired data of bay in the group.Wherein, when sending data, if transmission is broadcast data, then send out towards different orientation respectively with each antenna sets.Otherwise, only with the azimuthal orientation transmission data of selected antenna sets towards described terminal.
A step of every execution (3.1)～(3.4) can be described as a process of transmitting, and each transmission cycle comprises at least one process of transmitting.
In present embodiment, network side is if the access point in 802.11 agreements in order to reduce the impact of concealed terminal, needs to open RTS (Request To Send, request sends) or CTS (Clear To Send allows to send).
When actual networking, the antenna sets number M value of this implementation column can value be 3 preferably, namely is divided into 3 groups, and each the group court roughly interior direction of 120 degree scopes sends data; Perhaps value is 4, respectively to 4 roughly the orientation of the scopes of 90 degree send data.
When actual networking, on the network equipment, antenna sets can adopt the Centralized layout mode, also can adopt the distributed arrangement mode, and is namely distant between each antenna sets, and connects by different remote radios.
One of ordinary skill in the art will appreciate that all or part of step in the said method can come the instruction related hardware to finish by program, described program can be stored in the computer-readable recording medium, such as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is the preferred embodiments of the present invention only, is not for limiting protection scope of the present invention.According to summary of the invention of the present invention; also other various embodiments can be arranged; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. radio data transmission method, be applied in multiple-input and multiple-output (MINO) system, the bay of network side is divided into the antenna sets more than 2, comprises at least a bay in each antenna sets, in cycle, described network side is carried out following operation at each data receiver:
Use local all bays to receive the data that the terminal in the described mimo system sends, and the data that respectively each antenna sets received merge separately, demodulation and decoding are processed;
Select to be used for sending the antenna sets of downlink data, and in next data transmitting period, use this antenna sets of selecting to send downlink data to described terminal.
2. the method for claim 1 is characterized in that:
Described each antenna sets adopts distributed arrangement mode or centralized arrangement mode.
3. the method for claim 1 is characterized in that:
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
Described network side selects signal to noise ratio, Signal to Interference plus Noise Ratio in the more than one antenna sets that the data that receive are correctly decoded, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data.
4. the method for claim 1 is characterized in that:
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
When the data that described network side receives in all antenna sets all can not be correctly decoded, in all antenna sets, select signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data, perhaps select the antenna sets of bit error rate, Packet Error Ratio or frame error rate minimum as described antenna sets for sending downlink data.
5. the method for claim 1 is characterized in that:
Described network side selects to be used for sending the antenna sets of downlink data, specifically comprises:
When downlink data to be sent was broadcast singal, described network side selected all antenna sets as described antenna sets for sending downlink data; Perhaps,
When downlink data to be sent is broadcast singal, described network side in all bays, select by front N root signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets that forms of the bay of received power maximum as described antenna sets for the transmission downlink data; Wherein, N is greater than 1 and less than the constant of the maximum transmitting antenna array element number of descending permission.
6. such as the described method of claim 1～4, it is characterized in that:
Described network side uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period, specifically comprises:
Described network side uses selected antenna sets to the described downlink data of direction directive sending of described terminal in next data transmitting period.
7. the network equipment in a multiple-input and multiple-output (MINO) system comprises: N antenna sets, a N receiving processing module, signal processing module, antenna sets selection module and transmission processing module; Wherein, N is the integer more than or equal to 2, each antenna sets with and only link to each other with a receiving processing module;
At least comprise a bay in each antenna sets, be used for receiving in the cycle at each data receiver the data of the terminal transmission of described mimo system, and the data that each bay in this antenna sets receives are sent to the receiving processing module that links to each other with this antenna sets;
The data that each receiving processing module is used for that coupled antenna sets is sent merge separately, demodulation and decoding are processed, and the data after will processing send to described signal processing module;
Described signal processing module is used for receiving the treated data that described each receiving processing module is sent; Also be used for after the information of receiving the antenna sets of selecting that described antenna sets selection module is sent, notifying described transmission processing module;
Antenna sets selects module to be used for the described treated data that receive according to described signal processing module, selects to be used for sending the antenna sets of downlink data, and notifies described signal processing module with the information of the antenna sets selected;
Described transmission processing module uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period for the information of the described antenna sets of selecting of sending according to described signal processing module.
8. network equipment as claimed in claim 7 is characterized in that:
Described antenna sets selects module to select to be used for sending the antenna sets of downlink data, specifically comprises:
Described antenna sets selects module in the treated data that described signal processing module receives, select signal to noise ratio, Signal to Interference plus Noise Ratio in the more than one antenna sets of selecting to be correctly decoded, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data; Perhaps,
Described antenna sets selects module in the treated data that described signal processing module receives, in the situation that data all can not be correctly decoded, in all antenna sets, select signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets of received power maximum as described antenna sets for sending downlink data, perhaps select the antenna sets of bit error rate, Packet Error Ratio or frame error rate minimum as described antenna sets for sending downlink data.
9. network equipment as claimed in claim 7 is characterized in that:
Described antenna sets selects module to select to be used for sending the antenna sets of downlink data, specifically comprises:
When downlink data to be sent was broadcast singal, described antenna sets selected module to select all antenna sets as described antenna sets for sending downlink data; Perhaps,
When downlink data to be sent is broadcast singal, described antenna sets select module in all bays, selects by front M root signal to noise ratio, Signal to Interference plus Noise Ratio, carry dried make an uproar than or the antenna sets that forms of the bay of received power maximum as described antenna sets for the transmission downlink data; Wherein, M is greater than 1 and less than the constant of the maximum transmitting antenna array element number of descending permission.
10. such as the described network equipment of any one in the claim 7～9, it is characterized in that:
Described transmission processing module uses this antenna sets of selecting to send downlink data to described terminal in next data transmitting period, specifically comprises:
Described transmission processing module uses selected antenna sets to the described downlink data of direction directive sending of described terminal in next data transmitting period.
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