CN102624441B - A kind of transmission method and dispatching station - Google Patents
A kind of transmission method and dispatching station Download PDFInfo
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- CN102624441B CN102624441B CN201110033669.7A CN201110033669A CN102624441B CN 102624441 B CN102624441 B CN 102624441B CN 201110033669 A CN201110033669 A CN 201110033669A CN 102624441 B CN102624441 B CN 102624441B
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Abstract
The present invention provides a kind of transmission method being applied under LTE-LAN environment and dispatching station, and the method is applied to Long Term Evolution-LAN, including: sub-frame configuration is subframe structure based on standard cyclic prefix according to launching antenna port number by dispatching station；Then in the subframe configured, send corresponding pilot tone.The present invention is suitable for, to solve the problem that nomadic/local wireless data accesses, to reduce and optimize the expense of original system, to improve the handling capacity of system further, to meet the demand of the data user of high speed development.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to 3GPP (The3rdGenerationPartnershipProject, third generation partner program) LTE (LongTermEvolution, Long Term Evolution) is indoor, focus cover in transmission method and dispatching station.
Background technology
Universal along with mobile Internet (MobileInternet) and smart mobile phone, mobile data traffic demand is skyrocketed through.Predicting according to authoritative institution, in following 10 years, mobile data services amount also will be doubled every year, within 10 years, will increase by 1,000 times.
In carrier network, data service ratio is gradually increased, and have impact on conventional telecommunications level business, but, owing to data service is according to charge on traffic, its profit growth rate and flow load are not directly proportional.Additionally, the data service quickly increased proposes severe challenge to the transmittability of mobile communications network.Most mobile data services occur mainly in indoor and focus environment, are presented as that nomadic/local wireless accesses scene.Owing to indoor, the demand of focus soverlay technique, LTE focus covers the focus being increasingly becoming discussion, LTE-LAN (LTE-LocalAreaNetworks, LTE-LAN) generally can be used to call this technology.According to statistics, nearly the 70% of current mobile data services amount occurs in indoor, and continuation is also increased by this ratio, it is contemplated that will be more than 80% by 2012.The solution that operator is indoor in the urgent need to two-forty, focus covers.
Indoor and hot spot data service feature is that user is the most fixing or very low speed moves, less demanding to mobility；On the other hand, data service is mainly Internet service, and the requirement to service quality (QualityofServeice is called for short QoS) is more single, and far below the requirement to QoS of the carrier class business.What traditional cell mobile communication systems was mainly directed towards is high-speed mobile, the carrier class service design of seamless switching, and when it carries big flow low speed IP (Internet protocol) data packet traffic, efficiency is on the low side, high cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of transmission method being applied under LTE-LAN environment and dispatching station, to reduce and to optimize the expense of original system, to improve the handling capacity of system further.
In order to solve above-mentioned technical problem, the invention provides a kind of transmission method, be applied to Long Term Evolution-LAN, including:
Sub-frame configuration is subframe structure based on standard cyclic prefix according to launching antenna port number by dispatching station；Then in the subframe configured, send corresponding pilot tone.
Further, said method also has following feature: the step that sub-frame configuration is subframe structure based on standard cyclic prefix is included by described dispatching station according to launching antenna port number:
Described dispatching station judges that the structure of described subframe whether equal to 2, is the most then configured to the unicast sub-frame structure of standard cyclic prefix by described transmitting antenna port number；If it is not, the sub-frame configuration that support downlink physical is then shared channel transmission is single frequency network multicast broadcast subframe structure based on standard cyclic prefix, it is unicast sub-frame structure based on standard cyclic prefix by other sub-frame configuration.
Further, said method also has following feature: the described step sending corresponding pilot tone in the subframe configured includes:
In the described subframe being configured to unicast sub-frame structure, send for channel measurement and the public guide frequency of the coherent demodulation of data；
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port；Or
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement；Or
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement.
Further, said method also has following feature: described subframe includes that special subframe, described method also include: the protection in described special subframe is spaced and is configured to 1 OFDM symbol by described dispatching station.
In order to solve the problems referred to above, present invention also offers a kind of dispatching station, be applied to Long Term Evolution-LAN, including:
Configuration module, for being configured to the subframe structure of standard cyclic prefix according to transmitting antenna port number by the structure of subframe；
Sending module, for sending corresponding pilot tone in the subframe of described configuration module configuration.
Further, above-mentioned dispatching station also has following feature: described configuration module includes:
Judging unit, is used for judging that whether described transmitting antenna port number is equal to 2；
First dispensing unit, in the case of judging that described transmitting antenna port number is equal to 2 at described judging unit, is configured to the unicast sub-frame structure of standard cyclic prefix by the structure of described subframe；
Second dispensing unit, in the case of judging that described transmitting antenna port number is not equal to 2 at described judging unit, to support that downlink physical shares the structure of the subframe that channel sends, it is configured to the single frequency network multicast broadcast subframe structure of standard cyclic prefix, the structure of other subframes is configured to the unicast sub-frame structure of standard cyclic prefix.
Further, above-mentioned dispatching station also has following feature: described sending module includes:
First transmitting element, for being configured to the subframe of unicast sub-frame structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data；
Second transmitting element, for being configured to the subframe of single frequency network multicast broadcast subframe structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port；Or send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement；Or send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement.
Further, above-mentioned dispatching station also has following feature: in tdd systems, and described subframe includes special subframe, described configuration module, is additionally operable to be spaced the protection in described special subframe be configured to 1 OFDM symbol.
Further, above-mentioned dispatching station also has following feature: described dispatching station is base station or WAP.
To sum up, the present invention provides a kind of transmission method being applied under LTE-LAN environment and dispatching station, it is suitable for, to solve the problem that nomadic/local wireless data accesses, reducing and optimize the expense of original system, to improve the handling capacity of system further, to meet the demand of the data user of high speed development.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the dispatching station of the embodiment of the present invention；
Fig. 2 is the flow chart of the transmission method of the present invention；
Fig. 3 be the embodiment of the present invention based on the frame structure schematic diagram of LTE TDD system；
Fig. 4 is unicast sub-frame and the structural representation of MBSFN sub-frame of the embodiment of the present invention；
Fig. 5 a to Fig. 5 d is the pilot frequency design that the transmission of the embodiment of the present invention is sent；
Fig. 6 is the flow chart of the transmission method of the embodiment of the present invention.
Detailed description of the invention
In order to be more fully understood that the present invention, with specific embodiment, the present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram of the dispatching station of the embodiment of the present invention, as it is shown in figure 1, the dispatching station of the present embodiment includes: configuration module and sending module, wherein,
Configuration module, being used for according to launching antenna port number is subframe structure based on standard cyclic prefix by sub-frame configuration；
Sending module, for sending corresponding pilot tone in the subframe of described configuration module configuration.
Wherein, described configuration module may include that
Described judging unit, is used for judging that whether described transmitting antenna port number is equal to 2；
First dispensing unit, in the case of judging that described transmitting antenna port number is equal to 2 at described judging unit, is configured to the unicast sub-frame structure of standard cyclic prefix by the structure of described subframe；
Second dispensing unit, in the case of judging that described transmitting antenna port number is not equal to 2 at described judging unit, to support that downlink physical shares the structure of the subframe that channel sends, it is configured to the single frequency network multicast broadcast subframe structure of standard cyclic prefix, the structure of other subframes is configured to the unicast sub-frame structure of standard cyclic prefix.
Wherein, described sending module may include that
First transmitting element, for being configured to the subframe of unicast sub-frame structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data；
Second transmitting element, for being configured to the subframe of single frequency network multicast broadcast subframe structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port；Or send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement；Or send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement.
Further, in tdd systems, described subframe includes special subframe, described configuration module, it is also possible to be configured to 1 OFDM symbol for the protection in described special subframe being spaced.
Dispatching station in the present embodiment can be various types of base station or WAP.
Covering channel circumstance for indoor, focus, owing to the delay of channel extends the least, the present invention provides a kind of transmission method, is applied to LTE-LAN, as in figure 2 it is shown, the method for the present invention includes step:
Sub-frame configuration is subframe structure based on standard cyclic prefix according to launching antenna port number by S10, dispatching station；
S20, dispatching station send corresponding pilot tone and data in the subframe configured.
The cyclic prefix type of the symbol sent in each subframe (subframe) is configured to standard cyclic prefix (NormalCyclicPrefix is called for short NormalCP) by dispatching station.Described dispatching station can be all kinds base station or WAP (AP).Due to indoor, that focus covers application scenarios coverage is little, the Cyclic Prefix of each symbol in unicast sub-frame and single frequency network multicast broadcast subframe is each configured to standard cyclic prefix and can meet system requirements, relative to extended cyclic prefix, overhead can be reduced further.
Further, when launching antenna port number equal to 2, the structure of each subframe is configured to use common unicast sub-frame structure based on standard cyclic prefix by dispatching station, then dispatching station sends public guide frequency (CommonReferenceSignal on described unicast sub-frame, it is called for short CRS), this CRS is used for channel measurement and the coherent demodulation of data.
Further, when launching antenna port number and being not equal to 2, dispatching station arranges support downlink physical and shares the subframe that channel (PDSCH) sends, use single frequency network multicast based on standard cyclic prefix/broadcast (Multicast/BroadcastoverSingleFrequencyNetwork, it is called for short MBSFN) subframe structure, other subframes use unicast sub-frame structure based on standard cyclic prefix.
For being configured to use MBSFN sub-frame based on standard cyclic prefix, the following mode that sends of the optional employing of dispatching station:
A, dispatching station send for channel measurement and the CRS of the coherent demodulation of data on a sky port；Or
B, dispatching station send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and send the channel condition information pilot tone (Channel-StateInformationReferenceSignal is called for short CSI-RS) for channel measurement；Or
C, dispatching station send for channel measurement and the CRS of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the CSI-RS of channel measurement.
Further; special subframe for TDD (time division duplex) system; protection in special subframe is spaced (GP) and is configured to equal to 1 OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) symbol by dispatching station.
The method of the application of the invention, the application scenarios (i.e. LTE-LAN) covered for indoor, focus, by reasonable disposition subframe, can be reduced overhead, the handling capacity of system can be improved further, to meet the demand of data business volume.
Fig. 3 be the embodiment of the present invention based on the schematic diagram of frame structure of LTE TDD system.The unit frame of frame length 10ms is made up of the generic uplink of 10 a length of 1ms or descending sub frame 101 and special subframe 102.Wherein, special subframe 102 comprises descending time slot 103, protection interval 104 and ascending time slot 105.
Fig. 4 is unicast sub-frame and the structural representation of MBSFN sub-frame of the embodiment of the present invention.Described common unicast sub-frame and MBSFN sub-frame frame length are 1ms, and each subframe is made up of 14 OFDM symbol 201, a length of 4.758us of the standard cyclic prefix 202 comprised in OFDM symbol 201.
Fig. 5 a to Fig. 5 d is the pilot frequency design that the transmission of the embodiment of the present invention is sent.
Fig. 5 a is for two channel measurement launching antenna port and the public guide frequency patterns of data coherent demodulation, the pilot frequency locations such as 302 that antenna port 0 sends, the pilot frequency locations such as 303 that antenna port 1 sends；Antenna port 0,1 does not sends in the position of 301 marks.
Fig. 5 b is to launch antenna port number when being not equal to 2, the public guide frequency pattern sent by single antenna port in MBSFN sub-frame.
Fig. 5 c is the pattern of the special pilot frequency for user being exclusively used in user data coherent demodulation sent on antenna port 5.
Fig. 5 d is the pattern of the channel condition information pilot tone being exclusively used in channel measurement on antenna port 15～22；The pilot frequency design of antenna port 15 penetrates antenna to being applied to single-shot, and the pilot frequency design of antenna port 15,16,17,18 is to being applied to 4 transmitting antennas, and the pilot frequency design of antenna port 15,16,17,18,19,20,21,22 is to being applied to 8 transmitting antennas.
Fig. 6 is the flow chart of the transmission method of the embodiment of the present invention, and idiographic flow is:
Step 101, dispatching station judge to launch whether antenna port number is 2, the most then perform step 102, otherwise, perform step 104；
Step 102, dispatching station judge that launching antenna port number is 2, then dispatching station arranges the structure employing common unicast sub-frame structure based on standard cyclic prefix of subframe；
Step 103, dispatching station send for channel measurement and the CRS of the coherent demodulation of data on the unicast sub-frame configured, and the pattern position of CRS as shown in Figure 5 a, terminates.
Step 104, dispatching station judge that launching antenna port number is not equal to 2, then dispatching station arranges the subframe supporting PDSCH to send and uses MBSFN sub-frame structure based on standard cyclic prefix, and other subframes use unicast sub-frame structure based on standard cyclic prefix；
Step 105, for use MBSFN sub-frame based on standard cyclic prefix, dispatching station sent CRS as shown in Figure 5 b at single day on port, this CRS is used for channel measurement and the coherent demodulation of data, and/or sends the special pilot frequency for user of the coherent demodulation for data as shown in Figure 5 c and send the channel condition information pilot tone for channel measurement as fig 5d；
For using unicast sub-frame based on standard cyclic prefix, dispatching station sends for channel measurement and the CRS of the coherent demodulation of data.
Preferably for time division duplex (TDD) system, the protection in special subframe is also spaced (GP) and is configured to equal to 1 OFDM symbol by dispatching station, can use configuration A shown in table 1 below or configuration B two kinds configuration, and unit is OFDM symbol.
Table 1
| Special subframe | DwPTS (descending time slot) | GP | UpPTS (ascending time slot) |
| A | 12 | 1 | 1 |
| B | 11 | 1 | 2 |
It is an advantage of the invention that the application scenarios covered for indoor, focus, sent by reasonable disposition subframe and signal, reduce the control overhead of system, the handling capacity of system can be improved further.
One of ordinary skill in the art will appreciate that all or part of step in said method can instruct related hardware by program and complete, described program can be stored in computer-readable recording medium, such as read only memory, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can realize to use the form of hardware, it would however also be possible to employ the form of software function module realizes.The present invention is not restricted to the combination of the hardware and software of any particular form.
These are only the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; in the case of without departing substantially from present invention spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and deformation according to the present invention, but these change accordingly and deform the protection domain that all should belong to appended claims of the invention.
Claims (7)
1. a transmission method, is applied to Long Term Evolution-LAN, including:
Sub-frame configuration is subframe structure based on standard cyclic prefix according to launching antenna port number by dispatching station；Then in the subframe configured, send corresponding pilot tone；
The step that sub-frame configuration is subframe structure based on standard cyclic prefix is included by described dispatching station according to launching antenna port number:
Described dispatching station judges that whether described transmitting antenna port number is equal to 2, if not, the sub-frame configuration that support downlink physical is then shared channel transmission is single frequency network multicast broadcast subframe structure based on standard cyclic prefix, is unicast sub-frame structure based on standard cyclic prefix by other sub-frame configuration；
Described subframe includes that special subframe, described method also include:
Protection in described special subframe is spaced and is configured to 1 OFDM symbol by described dispatching station.
2. the method for claim 1, it is characterised in that: the step that sub-frame configuration is subframe structure based on standard cyclic prefix is also included by described dispatching station according to launching antenna port number:
Described dispatching station judges that the structure of described subframe whether equal to 2, is the most then configured to the unicast sub-frame structure of standard cyclic prefix by described transmitting antenna port number.
3. method as claimed in claim 2, it is characterised in that: the described step sending corresponding pilot tone in the subframe configured includes:
In the described subframe being configured to unicast sub-frame structure, send for channel measurement and the public guide frequency of the coherent demodulation of data；
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port；Or
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement；Or
In the described subframe being configured to single frequency network multicast broadcast subframe structure, send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement.
4. a dispatching station, is applied to Long Term Evolution-LAN, including:
Configuration module, for being configured to the subframe structure of standard cyclic prefix according to transmitting antenna port number by the structure of subframe；
Sending module, for sending corresponding pilot tone in the subframe of described configuration module configuration；
Described configuration module includes:
Judging unit, is used for judging that whether described transmitting antenna port number is equal to 2；
Second dispensing unit, in the case of judging that described transmitting antenna port number is not equal to 2 at described judging unit, to support that downlink physical shares the structure of the subframe that channel sends, it is configured to the single frequency network multicast broadcast subframe structure of standard cyclic prefix, the structure of other subframes is configured to the unicast sub-frame structure of standard cyclic prefix；
In tdd systems, described subframe includes special subframe, described configuration module, is additionally operable to be spaced the protection in described special subframe be configured to 1 OFDM symbol.
5. dispatching station as claimed in claim 4, it is characterised in that:
First dispensing unit, in the case of judging that described transmitting antenna port number is equal to 2 at described judging unit, is configured to the unicast sub-frame structure of standard cyclic prefix by the structure of described subframe.
6. dispatching station as claimed in claim 5, it is characterised in that: described sending module includes:
First transmitting element, for being configured to the subframe of unicast sub-frame structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data；
Second transmitting element, for being configured to the subframe of single frequency network multicast broadcast subframe structure in described configuration module, sends for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port；Or send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement；Or send for channel measurement and the public guide frequency of the coherent demodulation of data at an antenna port, and send the special pilot frequency for user of the coherent demodulation for data in corresponding logical antenna ports and be used for the information status information pilot tone of channel measurement.
7. the dispatching station as described in any one of claim 4-6, it is characterised in that: described dispatching station is base station or WAP.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101421958A (en) * | 2006-04-12 | 2009-04-29 | Lg电子株式会社 | Method for allocating reference signals in MIMO system |
| WO2010068029A2 (en) * | 2008-12-09 | 2010-06-17 | Lg Electronics Inc. | Reference signal transmission method for downlink multiple input multiple output system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101421958A (en) * | 2006-04-12 | 2009-04-29 | Lg电子株式会社 | Method for allocating reference signals in MIMO system |
| WO2010068029A2 (en) * | 2008-12-09 | 2010-06-17 | Lg Electronics Inc. | Reference signal transmission method for downlink multiple input multiple output system |
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