CN102905270B - Communication method and device for frequency division duplexing (FDD) system and base station - Google Patents
Communication method and device for frequency division duplexing (FDD) system and base station Download PDFInfo
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Abstract
The invention provides a communication method and device for a frequency division duplexing (FDD) system and a base station. The communication method comprises the following steps of: forming at least two symmetrical frequency band groups by respectively using a first frequency band and at least two second frequency bands, and allocating the at least two symmetrical frequency band groups to at least two cells, wherein the transmission directions of the first frequency band and the second frequency bands are opposite, and the bandwidth of the first frequency band and the bandwidth of the second frequency bands are equal; and in each cell, transmitting data by adopting resource blocks in the first frequency band according to a set scheduling strategy. According to the method, the device and the base station, a plurality of symmetrical frequency band groups are formed by using one frequency band and multiple reverse-transmission frequency bands and allocated to a plurality of independent cells, so that the problem that the FDD system is used when asymmetrical frequency bands exist in the system can be effectively solved. Meanwhile, according to the technical scheme, a TDD (Time Division Duplexing) technology and a CA (Carrier Aggregation) technology are not required for being configured, so that the network investment cost is small, and no additional functional requirements for a mobile terminal are required.
Description
Technical field
The present invention relates to wireless network communication technique, particularly relate to a kind of communication means of frequency division duplex system, device and base station.
Background technology
Long Term Evolution (the Long Term Evolution of 3G system, be called for short LTE) define Frequency Division Duplexing (FDD) (Frequency Division Duplexing in system simultaneously, be called for short FDD) and time division duplex (TimeDivision Duplexing, be called for short TDD) these two kinds of duplex modes, when adopting different duplex mode, be called FDD LTE system and TDD LTE system.
As shown in Figure 1, in FDD LTE system, need configure the paired frequency range of same band, one of them frequency range is used for transmitting uplink data, and another frequency range is used for downlink data transmission.In LTEFDD system, multiple frequency range can be supported in a base station, and such as, in Fig. 1, FDD frequency range A and FDD frequency range B can be supported in a base station simultaneously.Form an individual cell by the uplink and downlink frequency range of FDD frequency range A, form an individual cell by the uplink and downlink frequency range of FDD frequency range B.Liang Ge community is separate, serves respective mobile terminal respectively.And in TDD LTE system, one section of asymmetric frequency range of continuous print need be configured, in whole frequency range, part-time is used for transmitting uplink data, and remaining time is used for downlink data transmission.
In existing LTE system, FDD mode requires that frequency range must be symmetrical, cannot utilize asymmetrical frequency range.If operator is LTE FDD system a symmetrical frequency range deploy, and also has an asymmetric frequency range in network, then existing solution has two kinds: this operator is in asymmetric frequency range deploy TD-LTE system; Or asymmetric frequency range is used for independent descending by this operator, form two descending and up carrier aggregation systems with the frequency range of symmetry.Carrier aggregation (the Carrier Aggregation of evolution (LTE-Advanced) system of LTE, being called for short CA) technology multiple carrier aggregation relative to arrowband becomes a wider frequency spectrum, for same mobile terminal is served, thus provide higher peak rate and throughput for the user of this mobile terminal.As shown in Figure 1, carrier aggregation technology can, using the uplink and downlink of frequency range A as a pair member carrier, can, using the uplink and downlink of frequency range B as a pair member carrier, be a mobile terminal service jointly.Also can using the uplink and downlink of frequency range A as a pair member carrier, descending as member carrier using frequency range B is a mobile terminal service jointly.If apply carrier aggregation technology, need mobile terminal to support carrier aggregation technology, namely need the terminal supporting carrier aggregation capacity.As shown in Figure 2, two band downlinks comprise a main member carrier (PCC) and an auxiliary member carrier (SCC).
But this two schemes all has certain defect.That is, scheme one operator needs the network simultaneously disposing LTE FDD system and TD-LTE system, pays double investment.Scheme two, needs the LTE mobile terminal supporting carrier aggregation function, so propose restriction requirement to terminal.
Therefore, present technology propose at lower cost with the demand requiring the asymmetric resource of frequency range made full use of in network.
Summary of the invention
The invention provides a kind of communication means of frequency division duplex system, device and base station, when network investment and the software and hardware requirement of lower cost, make full use of the asymmetric resource of frequency range in network.
First aspect present invention provides a kind of communication means of frequency division duplex system, comprising:
First frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges respectively, and distributes at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal;
In each cell, the Resource Block transmission data in described first frequency range are adopted according to configuration scheduling strategy.
Second aspect present invention provides a kind of communicator of frequency division duplex system, comprising:
Microzonation sub-module, for the first frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges respectively, and distribute at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal;
Scheduled transmission module, in each cell, adopts the Resource Block transmission data in described first frequency range according to configuration scheduling strategy.
Third aspect present invention provides a kind of base station, comprises the communicator of frequency division duplex system provided by the present invention.
The communication means of the frequency division duplex system that the embodiment of the present invention provides, device and base station, the frequency range of a certain frequency range and multiple reverse transmission is formed multiple symmetrical frequency band group, distribute to multiple independently community, the symmetrical frequency band group of each community shares a frequency range, and this shared frequency range is different from another frequency range Duplex Spacing in each symmetrical frequency band group, when effectively can there is asymmetric frequency range in resolution system, utilize the problem of FDD technology.Meanwhile, this technical scheme without the need to configuring TDD technology and CA technology, thus network investment cost little, also extra functional requirement is not proposed to mobile terminal.
Accompanying drawing explanation
Fig. 1 is the frequency range distribution schematic diagram one adopting carrier aggregation technology in prior art;
Fig. 2 is the frequency range distribution schematic diagram two adopting carrier aggregation technology in prior art;
The flow chart of the communication means of the frequency division duplex system that Fig. 3 provides for the embodiment of the present invention one;
The frequency range distribution schematic diagram that Fig. 4 is suitable for by the embodiment of the present invention;
The flow chart of the communication means of the frequency division duplex system that Fig. 5 provides for the embodiment of the present invention two;
The structural representation of the communicator of the frequency division duplex system that Fig. 6 provides for the embodiment of the present invention three.
Embodiment
Embodiment one
The flow chart of the communication means of the frequency division duplex system that Fig. 3 provides for the embodiment of the present invention one, the communication means of the present embodiment is applied to LTE FDD system, and is applicable to the situation that there is asymmetric frequency range in system.Frequency range in LTE FDD system can be divided into one or more symmetrical frequency band group according to demand, carries out transfer of data based on FDD mode.When also remaining a frequency range in system and cannot forming symmetrical frequency band group with other frequency ranges, namely become asymmetric frequency range.As shown in Figure 4, FDD uplink band A and FDD band downlink B forms symmetrical frequency band group, and FDD band downlink C is asymmetric frequency range.The present embodiment is for this situation presents solution, and specifically complete this communication means by the base station of network side, concrete steps are as follows:
First frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges by step 310, base station respectively, and distribute at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal;
With reference to the example that Fig. 4 provides, be described for two the second frequency ranges.FDD uplink band A is the first frequency range, and FDD band downlink B and FDD band downlink C is the second frequency range.Certainly, the first frequency range is band downlink, and the second frequency range is that uplink band also can realize, and will be described follow-up.The operation carrying out frequency range division can be completed in advance by system, remains with this frequency range splitting scheme and the corresponding relation with community in base station.
Step 320, in each cell, base station adopts the Resource Block transmission data in described first frequency range according to configuration scheduling strategy.
Because the first frequency range gives multiple community respectively, so need the first frequency range to be divided in units of Resource Block according to configuration scheduling strategy, and distribute to different communities.Configuration scheduling strategy can for the static policies preset, and such as, the resource block location that each community is got is constant.Or also can be the scheduling strategy according to loading demand change, such as, according to the current loading condition in community determine for this cell allocation Resource Block number.After base station assigns Resource Block, the position of record Resource Block, and the attribution data that the location recognition passing through record is transmitted on this Resource Block is in which community.
When the first frequency range is band downlink, when the second frequency range is uplink band, the corresponding relation of Resource Block and community directly can be known in base station, in operation and accessible.And when the first frequency range is uplink band, when second frequency range is band downlink, the corresponding relation of Resource Block and community need be informed to mobile terminal by base station, then on the basis of above-described embodiment, in each cell, the transmission of the Resource Block in described first frequency range data are adopted specifically to comprise according to configuration scheduling strategy:
Resource block assignments in described uplink band is given described at least Liang Ge community according to configuration scheduling strategy by step 321, base station;
The positional information of the Resource Block distributing to this community in uplink band, by the band downlink of each community, is sent to mobile terminal by step 322, base station;
Step 323, when base station receive from uplink band mobile terminal transmission data time, according to the positional information of data place Resource Block, according to described in the identification of described configuration scheduling strategy Resource Block ownership community.
The technical scheme that the embodiment of the present invention provides, by the form shared, forms multiple symmetrical frequency band group by the frequency range of a certain frequency range and multiple reverse transmission, distributes to multiple independently community, the work independently of each community.Multiple symmetrical frequency band group shares a frequency range, and Duplex Spacing between this shared frequency range from another frequency range in each symmetrical frequency band group is different.Technique scheme utilizes the problem of FDD technology when effectively can there is asymmetric frequency range in resolution system.Meanwhile, this technical scheme without the need to configuring TDD technology and CA technology, thus network investment cost little, also extra functional requirement is not proposed to mobile terminal.
On the basis of previous embodiment, preferred resources block is Physical Resource Block.Physical Resource Block is the least unit of transmission data, and the present embodiment distributes the transfer resource in same frequency range to different districts in units of Physical Resource Block.
On the basis of such scheme, by the band downlink of each community, the positional information of the Resource Block distributing to this community in uplink band sent to mobile terminal specifically can comprise following several situation:
In the broadcast message of the band downlink of each community, the positional information of the Resource Block distributing to the uplink random access channel of this community in uplink band is sent to mobile terminal;
In the Physical Downlink Control Channel of the band downlink of each community, the positional information of the Resource Block distributing to the ascending control channel of this community in uplink band is sent to mobile terminal;
In the descending control signaling of the band downlink of each community, the positional information of the Resource Block distributing to the uplink data channels of this community in uplink band is sent to mobile terminal.
When shared uplink band, relate to the resource distributing to mobile terminal and be generally uplink random access channel (Random Access Channel, be called for short RACH), Physical Uplink Control Channel (PhysicalUplink Control Channel, be called for short PUCCH) and Physical Uplink Shared Channel (Physical UplinkShared Channel, be called for short PUSCH), in different phase, all mobile terminal can be notified by the channel of band downlink.As, broadcast message is by Physical Broadcast Channel (Physical BroadcastChannel, be called for short PBCH) issue, descending control signaling notifies mobile terminal by Physical Downlink Control Channel (PhysicalDownlink Control Channel is called for short PDCCH).Technique scheme, in the different phase of connection of mobile terminal into network, notifies the positional information of the ascending resource block distributed to mobile terminal with different message.This has continued to use mobile terminal in prior art and has known the mode of its ascending resource, so the operator scheme of mobile terminal side is without the need to changing.Base station utilizes the mechanism of other frequency carrier channel synchronization, can by notifying that the mode of resource block location is coordinated each cell mobile terminal and shared uplink band resource.The resource block location of different districts is distributed to because base station is pre-recorded, so distinguish its community belonged to by the resource block location in uplink band, thus avoid up collision phenomenon to occur, reach the object utilizing asymmetric frequency range in LTE FDD system.
Embodiment two
The flow chart of the communication means of the frequency division duplex system that Fig. 5 provides for the embodiment of the present invention two, the method is a specific embodiment, with reference to shown in Fig. 4, gives two communities worked alone by three frequency allocations, and be the Physical Resource Block of each cell allocation uplink band, the method comprises the steps:
Step 501, base station carry the Physical Resource Block position of uplink random access channel by the broadcast message of PBCH, broadcast to each mobile terminal;
Step 502, base station access the access request of channel mobile terminal receive at uplink random;
Mobile terminal is by normal access process, search the synchronizing information of band downlink, synchronous and receive the broadcast message of broadcast channels carry common, from broadcast message, know the Physical Resource Block position of uplink random access channel, corresponding Physical Resource Block position sends random access request.The access request of base station receiving mobile the community belonged to by resource block location identification, carry out record.
Step 503, base station inform the Physical Resource Block position of PUCCH by PDCCH;
Base station divides the Physical Resource Block position of Liang Ge community PUCCH by collision avoidance mechanism, avoids occurring conflict.Which community identification of base stations mobile terminal belongs to, and is notified the PUCCH Physical Resource Block position of its affiliated subdistrict of mobile terminal by PDCCH after mobile terminal access.
Step 504, base station inform the Physical Resource Block position of PUSCH by the descending control signaling of PDCCH.
Base station divides the Physical Resource Block position of Liang Ge community PUSCH, avoids occurring conflict.Which community identification of base stations mobile terminal belongs to, and by the Physical Resource Block position of its PUSCH of descending control signaling notice mobile terminal after mobile terminal access.
In the present embodiment, by the shared uplink band of cell identification and collision avoidance mechanism coordination Liang Ge community of base station, avoid conflict.The method makes the community of two shared uplink bands to distinguish proper communication, makes to reach the object utilizing asymmetric frequency range by this method.
The technical scheme that the embodiment of the present invention provides, not only takes full advantage of the resource of frequency range, and is more adapted to the data traffic feature of existing network business, effectively can improve network capacity under FDD system configuration.LTE network is mainly used in high-speed data service, different from speech business, and the downlink traffic of data service is much larger than uplink traffic, and up-downgoing data traffic is asymmetric is a large feature of data service.The technical scheme of the embodiment of the present invention can adapt to the asymmetric characteristic of this data service up-downgoing, can improve the utilance of uplink band when shared uplink band.Meanwhile, the distribution for ascending resource also has higher flexibility.When Liang Ge community shares a uplink band, in instantaneous scheduling, can distribute ascending resource according to cell load, there will not be the situation of some communities free time, another local resource deficiency.Thus also improve dispatching flexibility, add the utilization ratio of frequency spectrum.
Embodiment three
The structural representation of the communicator of the frequency division duplex system that Fig. 6 provides for the embodiment of the present invention three, this communicator can be realized by the mode of software and/or hardware, is integrated in base station or similar network element.This communicator comprises: microzonation sub-module 610 and scheduled transmission module 620.Wherein, microzonation sub-module 610 for the first frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges respectively, and distributes at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal; Scheduled transmission module 620, in each cell, adopts the Resource Block transmission data in described first frequency range according to configuration scheduling strategy.
In above-mentioned communicator, when described first frequency range is uplink band, when described second frequency range is band downlink, then scheduled transmission module 620 specifically comprises: resource allocation unit 621, position transmitting element 622 and cell identification unit 623.Wherein, resource allocation unit 621, for giving described at least Liang Ge community according to configuration scheduling strategy by the resource block assignments in described uplink band; Position transmitting element 622, for the band downlink by each community, sends to mobile terminal by the positional information of the Resource Block distributing to this community in uplink band; Cell identification unit 623 for when receive from uplink band mobile terminal transmission data time, according to the positional information of data place Resource Block, according to described in the identification of described configuration scheduling strategy Resource Block ownership community.
Particularly, position transmitting element 622 for by the location information notification of Resource Block to mobile terminal, it can specifically comprise: access channel notification subelement 622a, control channel notice subelement 622b and transmission channel notice subelement 622c.Wherein, access channel notification subelement 622a, in the broadcast message of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the uplink random access channel of this community in uplink band; Control channel notice subelement 622b, in the Physical Downlink Control Channel of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the ascending control channel of this community in uplink band; Transmission channel notice subelement 622c, in the descending control signaling of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the uplink data channels of this community in uplink band.
In such scheme, the resource of frequency range block distributing to different districts is preferably Physical Resource Block.Mobile terminal can be continued to use prior art and knows Physical Resource Block position and use uplink band, without the need to carrying out the improvement of mobile terminal.
The embodiment of the present invention also can provide a kind of base station, comprises the communicator of the frequency division duplex system that any embodiment of the present invention provides.
The communicator of the frequency division duplex system that the embodiment of the present invention provides can be used for the communication means performing the frequency division duplex system that the embodiment of the present invention provides, and possesses corresponding functional module.Adopt the technical scheme of the embodiment of the present invention, when operator obtains symmetrical frequency band and asymmetric frequency range simultaneously, two cover LTE system can be disposed, the mobile terminal supporting carrier aggregation can not be adopted.Carrier aggregation technology requires that mobile terminal supports multiple frequency range simultaneously, also brings stricter requirement and challenge to the radio-frequency (RF) index of mobile terminal.Relative to carrier aggregation mode, the program does not need to use carrier aggregation mobile terminal.The mobile terminal used in the present invention and prior art are consistent, and do not need what's new of upgrading, and technology maturation.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a communication means for frequency division duplex system, is characterized in that, comprising:
First frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges respectively, and distributes at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal;
In each cell, the Resource Block transmission data in described first frequency range are adopted according to configuration scheduling strategy;
Described first frequency range is uplink band, and described second frequency range is band downlink, then in each cell, adopt the transmission of the Resource Block in described first frequency range data to comprise according to configuration scheduling strategy:
Described at least Liang Ge community is given by the resource block assignments in described uplink band according to configuration scheduling strategy;
By the band downlink of each community, the positional information of the Resource Block distributing to this community in uplink band is sent to mobile terminal;
When receiving the data of mobile terminal transmission from uplink band, according to the positional information of data place Resource Block, according to the community of Resource Block ownership described in the identification of described configuration scheduling strategy.
2. the communication means of frequency division duplex system according to claim 1, is characterized in that, by the band downlink of each community, sends to mobile terminal to comprise the positional information of the Resource Block distributing to this community in uplink band:
In the broadcast message of the band downlink of each community, the positional information of the Resource Block distributing to the uplink random access channel of this community in uplink band is sent to mobile terminal;
In the Physical Downlink Control Channel of the band downlink of each community, the positional information of the Resource Block distributing to the Physical Uplink Control Channel of this community in uplink band is sent to mobile terminal;
In the descending control signaling of the band downlink of each community, the positional information of the Resource Block distributing to the Physical Uplink Shared Channel of this community in uplink band is sent to mobile terminal.
3. the communication means of frequency division duplex system according to claim 1 and 2, is characterized in that: described Resource Block is Physical Resource Block.
4. a communicator for frequency division duplex system, is characterized in that, comprising:
Microzonation sub-module, for the first frequency range is formed at least two symmetrical frequency band groups with at least two the second frequency ranges respectively, and distribute at least Liang Ge community, wherein, the transmission direction of described first frequency range and the second frequency range is contrary, and the bandwidth of described first frequency range and the second frequency range is equal;
Scheduled transmission module, in each cell, adopts the Resource Block transmission data in described first frequency range according to configuration scheduling strategy;
Described first frequency range is uplink band, and described second frequency range is band downlink, then scheduled transmission module comprises:
Resource allocation unit, for giving described at least Liang Ge community according to configuration scheduling strategy by the resource block assignments in described uplink band;
Position transmitting element, for the band downlink by each community, sends to mobile terminal by the positional information of the Resource Block distributing to this community in uplink band;
Cell identification unit, for when receiving the data of mobile terminal transmission from uplink band, according to the positional information of data place Resource Block, according to the community of Resource Block ownership described in the identification of described configuration scheduling strategy.
5. the communicator of frequency division duplex system according to claim 4, is characterized in that, described position transmitting element comprises:
Access channel notification subelement, in the broadcast message of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the uplink random access channel of this community in uplink band;
Control channel notice subelement, in the Physical Downlink Control Channel of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the Physical Uplink Control Channel of this community in uplink band;
Transmission channel notice subelement, in the descending control signaling of the band downlink of each community, sends to mobile terminal by the positional information of the Resource Block distributing to the Physical Uplink Shared Channel of this community in uplink band.
6. the communicator of the frequency division duplex system according to claim 4 or 5, is characterized in that: described Resource Block is Physical Resource Block.
7. a base station, is characterized in that, comprises the communicator of the arbitrary described frequency division duplex system of claim 4-6.
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| CN103997789B (en) * | 2013-02-20 | 2019-02-05 | 工业和信息化部电信传输研究所 | A kind of physical uplink control channel resource allocation methods and base station |
| CN104284432A (en) * | 2014-09-29 | 2015-01-14 | 中国联合网络通信集团有限公司 | Method and device for utilizing asymmetrical frequency band resource |
| KR20190016940A (en) | 2016-06-12 | 2019-02-19 | 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 | Data transmission method, terminal and base station |
| CN109561501B (en) * | 2017-09-25 | 2022-08-30 | 中国电信股份有限公司 | Duplex data transmission method, base station and terminal |
| CN109963283B (en) * | 2017-12-22 | 2022-06-07 | 成都鼎桥通信技术有限公司 | LTE cell implementation method |
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| EP2219399A1 (en) * | 2009-02-12 | 2010-08-18 | Alcatel Lucent | Allocating frequency channels of a femto cell |
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| CN101379723A (en) * | 2006-02-07 | 2009-03-04 | Lg电子株式会社 | Method for transmitting response information in mobile communications system |
| EP2219399A1 (en) * | 2009-02-12 | 2010-08-18 | Alcatel Lucent | Allocating frequency channels of a femto cell |
| CN102118756A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Carrier aggregation method and dynamic spectrum allocation method |
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