CN101415228B - Interlayer transmission diversity system and interlayer transmission diversity method - Google Patents
Interlayer transmission diversity system and interlayer transmission diversity method Download PDFInfo
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- CN101415228B CN101415228B CN 200710165021 CN200710165021A CN101415228B CN 101415228 B CN101415228 B CN 101415228B CN 200710165021 CN200710165021 CN 200710165021 CN 200710165021 A CN200710165021 A CN 200710165021A CN 101415228 B CN101415228 B CN 101415228B
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Abstract
The invention discloses an interlayer transmission diversity system and an interlayer transmission diversity method. The method comprises the following steps: step S202: an interlayer transmission diversity control unit acquires a measured result of a wireless terminal for a second type wireless connection point; step S204: the interlayer transmission diversity control unit updates an interlayer transmission diversity active set according to the measured result reported by the wireless terminal; and step S206: the interlayer transmission diversity control unit determines a diversity mode of transmission data between a first type wireless connection point and the second type wireless connection point in the active set, and the first type wireless connection point and the second type wireless connection point in the active set send the information in a diversity manner. By the method, the system has higher spectral efficiency when providing services to the wireless terminal in a high speed moving state, which overcomes the disadvantage that the traditional wireless access networks have difficulty in improving the transmission rate of the terminal located in a fringe area of a cell.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to interlayer transmit diversity systems and method under a kind of point-to-point service.
Background technology
In cellular mobile communication, transmitting often of base station just arrives the receiving terminal of travelling carriage through Multi reflection, scattering and refraction.Be easy to so just cause the multipath fading of signal.In fading environment, the multi-antenna diversity technology can be improved the performance of wireless communication system effectively.In the 3G system, the transmit diversity of many antennas is very important key technologies.Signal is gone out by separating antenna transmission enough far away on a plurality of spaces, the implementation space diversity.Interval between antenna is enough far away, can guarantee that the signal that each antenna transmission is gone out is incoherent through the decline that suffers after channel.WCDMA (wideband codedivision multiple access, Wideband Code Division Multiple Access (WCDMA) access) system has used the Open loop and closed loop transmit diversity techniques.
Having used two kinds of Open-Loop Transmit Diversity schemes in the WCDMA system, is respectively to send diversity (STTD) and time-switching transmit diversity (TSTD) in empty minute.
Sending diversity (STTD) in empty minute is that the data flow of will carry out chnnel coding, rate-matched and interweave under non-diversity mode is used the STTD coding in 4 continuous channel bit pieces.Time-switching transmit diversity (TSTD) is strange, the idol according to timeslot number, alternately sends synchronization codes and auxiliary synchronous code on two antennas.For example send with the 1st antenna during strange time slot, even time slot is with the 2nd antenna transmission.Adopt TSTD, can obtain very simply to merge suitable effect with maximum ratio in travelling carriage, greatly improved the probability of user side accurate synchronization, and shortened synchronous search time.Time-switching transmit diversity (TSTD) is exclusively used in synchronous channel SCH.
Two kinds of closed loop mode transmit diversities have been adopted in the WCDMA system.Closed loop mode transmit diversity key is the calculating of weighted factor, be divided into two kinds of patterns by weighted factor computational methods difference: pattern one adopts phase adjustment, the dedicated pilot symbol of two antenna transmission DPCCH (DedicatedPhysical Control Channel, Dedicated Physical Control Channel) different (quadrature); Pattern two adopts the phase/amplitude adjustment amount, and the dedicated pilot symbol of two antenna transmission DPCCH is identical.
The advantage of Open-Loop Transmit Diversity is not need signaling consumption, the travelling carriage complexity can be remained on a lower degree simultaneously, but this mode has obvious shortcoming, is exactly not utilize channel information.Closed loop transmit diversity modes the speed of a motor vehicle lower than the environment of 50km/h in the high 0.5dB of Eb/No ratio of gains open loop diversity, the closed loop transmit diversity modes performance is better than approximately 1dB of closed loop mode in the speed of a motor vehicle in lower than the environment of 30km/h substantially.
All for the design of individual layer planar network architecture, basic characteristics are the above-mentioned diversity mode of WCDMA: the antenna that transmit diversity uses is all that colocation site is installed.A large amount of patent applications that is used for the individual layer planar network architecture has appearred at present, as: 200380107408.9, use wave beam to form and Closed-Loop Transmit Diversity in multibeam antenna system; 200380100561.9, be used for the space-time emission diversity (STTD) of many antennas in radio communication; 03814993.1, realize system and the method thereof of Closed-Loop Transmit Diversity; 03819718.9, the diversity transmission mode of MIMO OFDM (multi-inmulti-out orthogonal frequency division multiplexing, multi-I/O OFDM) communication system.
In recent years, release along with distributed base station and shared common wireless interface standard CPRI (Common Public Radio Interface) Specification V3.0 (2006-10-20), and the startup of indoor base station standard operation, the cellular mobile communication Access Network that traditional individual layer covers is progressively developing into the form that bilayer or multilayer cover, under this background, some new transmit diversity techniques also propose, and develop with this framework that adapts to the cellular mobile communication Access Network.
A kind of transmit diversity techniques that proposes based on layering wireless access planar network architecture is to ask " a kind of collaborative structure and the method with taking place frequently and penetrating of interlayer " in patent, and application number is PCT/CN2006/001085, and the applying date is 2006-5-2.This application has proposed collaborative structure and the method for work with taking place frequently and penetrating of a kind of interlayer, described interlayer is collaborative is double-deck synergetic structure with a kind of version of penetrating that takes place frequently, this structure comprises: main emission layer, auxiliary emission layer, main emission layer is made of the larger master transmitter of coverage, and auxiliary emission layer is made of the relatively little booster transmitter of coverage; Two kinds of double-deck synergetic structure are superimposed according to the up and down mode, consist of coordinated emission structure between a kind of double layers, between double layers, the upper strata of synergetic structure is the main emission layer of a double-deck synergetic structure, lower floor is the auxiliary emission layer of another double-deck synergetic structure, and between double layers, the intermediate layer of synergetic structure is made of with the main emission layer that is positioned at that double-deck synergetic structure of bottom the auxiliary emission layer of superposed that double-deck synergetic structure.Described method comprises: double-deck collaborative interlayer coordinated emission method, method for synchronizing time and the power determining method of penetrating structure with taking place frequently and; The attainable coordinated emission method of coordinated emission structure between double layers.The present invention can comprehensively improve the spectrum efficiency, covering quality of digit broadcasting system and to ambulant tenability, can keep the highly compatible with the existing digital broadcast system.
The another kind of transmit diversity techniques that proposes based on layering wireless access planar network architecture is patent application " collocation method of floored community and diversity mode ", application number is 200610126031.7, the applying date is 2006.08.28, this Patent Application Publication the collocation method of a kind of floored community and diversity mode, make the floored community of different stage all can obtain more performance gain by transmit diversity.In the present invention, the residential quarter of the corresponding different big or small area coverages of different hierarchical levels of floored community, the floored community that hierarchical levels belongs to the first level group uses open loop transmit diversity modes, and the floored community that hierarchical levels belongs to the second level group uses closed loop transmit diversity modes.Wherein, in the first level group, the corresponding average area coverage of each hierarchical levels is all greater than the corresponding average area coverage of each hierarchical levels in the second level group, and each hierarchical levels belongs to and only belongs in a rank group.During direct-cut operation, the diversity mode that uses according to Target cell carries out the configuration of diversity mode attribute to UE (subscriber equipment) to UE between the alien frequencies floored community.
Patent US5,546, " wireless access system of a hierarchy and method of work " disclosed for No. 443, this system comprises macrocell and Microcell, all Microcells and macrocell shared control channel in macrocell, control channel are used for transmission access request information, paging information, travelling carriage and base station position information etc.Further, Microcell also has a shared Common Control Channel that is independent of hierarchy.The method of work of this system is: the business to macrocell request access is except being linked into this macrocell, also be linked into a Microcell that belongs to this macrocell, use the realization of macrocell and Microcell to the grand diversity of the control channel of this link and the grand diversity of Traffic Channel.
Patent application 02814129.6, " hierarchical cellular radio communication system ", this system comprises a umbrella macrocell and a plurality of picocells that covered by this macrocell, each macrocell and residential quarter comprise a controlling center.A secondary (terminal) has a communication channel of system communication therewith, and it is divided into for the control subchannel of control information transmission and is used for the subchannel data of transmitting user data.Control subchannel and secondary (terminal) is connected to the main website of service macrocell, and subchannel data is connected to secondary (terminal) main website of service picocell.The control section of described channel is mainly served by the umbrella macrocell, thereby reduces mobile management expense frequently, and data division is mainly served by the picocell that can support high data rate and large packing density.
In the formulation process of 3GPP LTE standard, clean culture (unicast) business is not adopted descending grand diversity, but to many Cell Broadcast CBs (broadcast) business, can make descending grand diversity practical by adopting larger CP.Although the layering transmit diversity techniques do not have in the 3GPPLTE standard to embodying,, these diversity techniques and further development will lay the first stone for the design of the follow-up evolution system of 3GPP LTE.
4, the shortcoming of prior art
(application number is PCT/CN2006/001085 in patent application " a kind of collaborative structure and the method with taking place frequently and penetrating of interlayer ", the applying date is 2006-5-2) shortcoming be: only provide a bit the interlayer transmission diversity method in the multicast business, be not given in the interlayer transmission diversity method under point-to-point service.
(application number is 200610126031.7 in patent application " collocation method of floored community and diversity mode ", the applying date is 2006.08.28) shortcoming be: provided in point-to-point communication the method that adopts different emission diversity methods in different layers, the implementation method of interlayer transmission diversity when not providing point-to-point communication.And, diversity to high speed mobile terminal in " floored community of first level group uses open loop transmit diversity modes, and the floored community that hierarchical levels belongs to the second level group uses closed loop transmit diversity modes " of its proposition by the shortcoming that " first level group " realizes is all: it is high that the antenna that the spectrum efficiency when terminal receives and realizes diversity from the signal of the transmitting antenna of two wide aparts receives an apart from each other not as terminal adds the spectrum efficiency at a distance of the diversity between nearer antenna.
Patent US5,546, the shortcoming of No. 443 disclosed " wireless access system of a hierarchy and method of works " is: 1) only considered the diversity between a macrocell and Microcell, do not considered the diversity between a macrocell and a plurality of Microcell; 2) do not consider diversity between a plurality of Microcells; 3) control channel and Traffic Channel are all carried out the mode that diversity is processed, when between Microcell antenna and macrocell antenna during apart from each other, such as, when terminal is in the edge of macrocell, is difficult to the diversity that reaches good and easily adjacent macrocell and the Microcell that closes on is produced larger interference.In a word, this is a kind of control channel and Traffic Channel all to be carried out the method for interlayer diversity.
only set up between the terminal of No. 02814129.6 " hierarchical cellular radio communication system " proposition of patent application and macrocell main website (base station) and control subchannel, and and only set up the method for subchannel data between Microcell main website (base station), namely the invention thought of different subchannels is set up in the different residential quarter that utilizes of this patent proposition, although can reach the minimizing control overhead theoretically, reduce the effect of disturbing, but, in real system, when terminal is in the edge of macrocell, will there be following shortcoming: in order to guarantee to control the reliability of subchannel, terminal need to send stronger control signal, this easily produces larger interference to adjacent macrocell and the Microcell that closes on.This is a kind of in layer architecture, control channel is not made diversity process, and only data channel is done the method for layer interior diversity;
Therefore, need a kind of solution of interlayer transmission diversity, can solve the problem in above-mentioned correlation technique.
Summary of the invention
The present invention is intended to realize in the application of point-to-point communication at the layering wireless access network, reach both can have macrocell to high-speed mobile support easy, can obtain good emission diversity gain again, and adopt interlayer transmission diversity to realize more organically collaborative work of interlayer.
according to an aspect of the present invention, interlayer transmission diversity system is provided, this system comprises: comprise the wireless contact of the first kind, the wireless contact of Equations of The Second Kind and wireless terminal, it is characterized in that, also comprise: the interlayer transmission diversity control unit, be used for obtaining the measurement result that wireless terminal is measured the wireless contact of Equations of The Second Kind, and upgrade the interlayer transmission diversity active set according to this measurement result that wireless terminal reports, and the interlayer transmission diversity pattern of the wireless contact of definite first kind and the wireless contact of one or more Equations of The Second Kinds, and control the wireless contact of the described first kind and the wireless contact of this one or more Equations of The Second Kinds never co-located with the interlayer transmission diversity pattern determined the wireless terminal transmission information that is linked into the wireless contact of this first kind in their coverages, wherein, the wireless contact of the first kind is macro cell base station, the wireless contact of Equations of The Second Kind is microcell base station, the wireless contact of Equations of The Second Kind passes through broadcast channel, the coding of pilot channel, or send identifying information in the mode of stacking pseudorandom sequence.
The interlayer transmission diversity control unit also is used for interlayer transmission diversity detection collection, interlayer transmission diversity Candidate Set and the interlayer transmission diversity active set that definite wireless terminal need to be surveyed.
A wireless contact of the first kind and the wireless contact of one or more Equations of The Second Kind comprise one of control information and business datum with the interlayer transmission diversity pattern of determining at least to the information that the wireless terminal that is linked into the wireless contact of the first kind in its coverage sends.
The first kind is wireless, and the contact covering wireless contact of Equations of The Second Kind or the wireless contact of the first kind and the wireless contact of Equations of The Second Kind exist overlapping.
The transmitting power of the wireless contact of the first kind is greater than the transmitting power of the wireless contact of Equations of The Second Kind, and the antenna height of the wireless contact of the first kind is greater than the antenna height of the wireless contact of Equations of The Second Kind.
Link between the wireless contact of the first kind and the wireless contact of Equations of The Second Kind is a kind of in fiber channel, metal channel and wireless channel.
The wireless contact of the first kind and the wireless contact of Equations of The Second Kind be synchronous working in time.
The interlayer transmission diversity control unit utilizes the geographical coordinate of the wireless contact of Equations of The Second Kind and determines dynamically that corresponding to the corresponding relation of the wireless point identifiers of geographical coordinate the interlayer transmission diversity that need to be surveyed by wireless terminal surveys collection.
Wireless terminal also is used for surveying the identifying information that the wireless contact of Equations of The Second Kind sends, and the power level that is used for the signal of its identification of measurement.
According to another aspect of the present invention, provide a kind of interlayer transmission diversity method, comprised the following steps: step S202, interlayer transmission diversity control unit obtain the measurement result that wireless terminal is measured the wireless contact of Equations of The Second Kind; Step S204, the measurement result that the interlayer transmission diversity control unit reports according to wireless terminal is upgraded the interlayer transmission diversity active set; And step S206, the interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set, and the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set comes transmission information with diversity mode, wherein, the wireless contact of the first kind is macro cell base station, the wireless contact of Equations of The Second Kind is microcell base station, the wireless contact of Equations of The Second Kind by broadcast channel, pilot channel coding or send identifying information in the mode of stacking pseudorandom sequence.
Step S202 comprises the following steps: the interlayer transmission diversity control unit issues detecting parameter to wireless terminal; And whether wireless terminal detect according to detecting parameter the contact that the wireless contact of Equations of The Second Kind surveys in collection and exist, and measure the signal strength signal intensity of the wireless contact of detected Equations of The Second Kind.
Wireless terminal is measured the signal strength signal intensity of the wireless contact of detected Equations of The Second Kind with cycle triggering mode or time triggering mode.
Step S202 comprises the following steps: the interlayer transmission diversity control unit upgrades the interlayer transmission diversity active set according to the information of the wireless contact of Equations of The Second Kind that is reported by wireless terminal according to signal interference ratio supreme principle or path loss minimum principle; The interlayer transmission diversity control unit upgrades the transmit diversity Candidate Set according to signal interference ratio supreme principle or path loss minimum principle; And the interlayer transmission diversity control unit upgrades interlayer transmission diversity detection collection.
The interlayer transmission diversity control unit comprises the following steps according to the step that signal interference ratio supreme principle or path loss minimum principle upgrade the transmit diversity Candidate Set: the interlayer transmission diversity control unit will be lower than interlayer transmission diversity active set thresholding but higher than the wireless contact of Equations of The Second Kind of interlayer transmission diversity Candidate Set thresholding as the wireless contact in the interlayer transmission diversity Candidate Set.
The interlayer transmission diversity control unit upgrades interlayer transmission diversity and surveys the step of collection and comprise the following steps: the interlayer transmission diversity control unit calculates the place-centric point of the wireless contact of Equations of The Second Kind in the interlayer transmission diversity active set, will be positioned at that the wireless contact of a plurality of Equations of The Second Kinds of predetermined radii scope collects as new interlayer transmission diversity detection around place-centric point.
Step S206 comprises the following steps: the interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set; The interlayer transmission diversity control unit sends needs with the data of the form transmission of interlayer transmission diversity according to the identifier of the wireless contact of Equations of The Second Kind in the interlayer transmission diversity active set after upgrading to the wireless contact of Equations of The Second Kind; And the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set sends the wireless signal of carrying data to wireless terminal with diversity mode.
The first kind that the present invention will cover greatly is wireless, and the contact switching times lacks the advantages high with the wireless contact spectrum efficiency of Equations of The Second Kind of little covering, and have following features: system has high spectrum efficiency when providing business to the wireless terminal that is in high-speed moving state; Overcome the shortcoming of transmission rate that the conventional wireless Access Network is difficult to be in to raising the terminal of cell edge region; Can be with multiple diversity mode work, particularly can be to realize easily the transmit diversity of single frequency network (bit synchronous, time synchronized, Frequency Synchronization) pattern, this diversity mode has good compatibility to existing terminal.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that illustrates according to interlayer transmission diversity system of the present invention;
Fig. 2 is the flow chart that illustrates according to interlayer transmission diversity method of the present invention;
Fig. 3 is the flow chart that illustrates according to the interlayer transmission diversity method of the embodiment of the present invention; And
Fig. 4 illustrates the schematic diagram of interlayer transmission diversity system according to another embodiment of the present invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram that illustrates according to interlayer transmission diversity system of the present invention.with reference to Fig. 1, interlayer transmission diversity system 100 according to the present invention comprises the wireless contact 102 of the first kind, Equations of The Second Kind is wireless contact 104, with wireless terminal 106, it is characterized in that, also comprise: interlayer transmission diversity control unit 108, be used for determining the interlayer transmission diversity pattern of a wireless contact of the first kind and the wireless contact of one or more Equations of The Second Kinds, and control the wireless contact of this first kind and the wireless contact of this one or more Equations of The Second Kinds never co-located in the interlayer transmission diversity mode determined the wireless terminal transmission information that is linked into the wireless contact of this first kind in their coverages.
Interlayer transmission diversity control unit 108 also is used for interlayer transmission diversity detection collection, interlayer transmission diversity Candidate Set and the interlayer transmission diversity active set that definite wireless terminal need to be surveyed.
The wireless contact 102 of the first kind at least comprises control information and business datum one of with the interlayer transmission diversity pattern of determining to the information that the wireless terminal that is linked into the wireless contact 102 of the first kind 106 in its coverage sends with the wireless contact 104 of one or more Equations of The Second Kinds.
The first kind is wireless, and the contact 102 covering wireless contacts 104 of Equations of The Second Kind or the wireless contact 102 of the first kind exist overlapping with the wireless contact 104 of Equations of The Second Kind.
The first kind is wireless, and the wireless contact 104 of contact 102 and Equations of The Second Kind is base stations or has antenna and the physical entity of radio frequency unit, and the antenna of the wireless contact of the first kind and the wireless contact of Equations of The Second Kind is omnidirectional antenna, has a kind of in the antenna of fixed-direction figure and array antenna.
Equations of The Second Kind is wireless contact 104 by broadcast channel, pilot channel coding or send identifying information in the mode of stacking pseudorandom sequence.
The transmitting power of the first kind is wireless contact 102 is greater than the transmitting power of the wireless contact 104 of Equations of The Second Kind, and the antenna height of the wireless contact 102 of the first kind is greater than the antenna height of the wireless contact 104 of Equations of The Second Kind.
The link that the first kind is wireless between the wireless contact 104 of contact 102 and Equations of The Second Kind is a kind of in fiber channel, metal channel and wireless channel.
The first kind the is wireless wireless contact 104 of contact 102 and Equations of The Second Kind is synchronous working in time.
The interlayer transmission diversity control unit utilizes the geographical coordinate of the wireless contact 104 of Equations of The Second Kind and determines dynamically that corresponding to the corresponding relation of the wireless point identifiers of geographical coordinate the interlayer transmission diversity of being surveyed by wireless terminal surveys collection.
Wireless terminal 106 also is used for surveying the identifying information that the wireless contact of Equations of The Second Kind sends, and the power level that is used for the signal of its identification of measurement.
The first kind is wireless, and contact 102 is the wireless contact of macrocell, and Equations of The Second Kind is wireless, and contact 104 is the wireless contact of Microcell.
Fig. 2 is the flow chart that illustrates according to interlayer transmission diversity method of the present invention.With reference to Fig. 2, interlayer transmission diversity method according to the present invention comprises the following steps: step S202, interlayer transmission diversity control unit obtain the measurement result that wireless terminal is measured the wireless contact of Equations of The Second Kind; Step S204, the measurement result that the interlayer transmission diversity control unit reports according to wireless terminal is upgraded the interlayer transmission diversity active set; And step S206, the interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set, and the interior wireless contact of Equations of The Second Kind of the wireless contact of the first kind and active set comes transmission information with diversity mode.
Step S202 comprises the following steps: interlayer transmission diversity is controlled and is issued detecting parameter to wireless terminal; And wireless terminal detects according to detecting parameter the signal strength signal intensity whether contact in the wireless contact detection of Equations of The Second Kind collection exists and measure the wireless contact of detected Equations of The Second Kind.
Wireless terminal is measured the signal strength signal intensity of the wireless contact of detected Equations of The Second Kind with cycle triggering mode or time triggering mode.
Step S202 comprises the following steps: the interlayer transmission diversity control unit is according to the information of the wireless contact of Equations of The Second Kind that is reported by wireless terminal and upgrade the interlayer transmission diversity active set according to signal interference ratio supreme principle or path loss minimum principle; The interlayer transmission diversity control unit upgrades the transmit diversity Candidate Set according to signal interference ratio supreme principle or path loss minimum principle; And the interlayer transmission diversity control unit upgrades interlayer transmission diversity detection collection.
The interlayer transmission diversity control unit comprises the following steps according to the step that signal interference ratio supreme principle or path loss minimum principle upgrade the transmit diversity Candidate Set: the interlayer transmission diversity control unit will be lower than interlayer transmission diversity active set thresholding but higher than the wireless contact of Equations of The Second Kind of interlayer transmission diversity Candidate Set thresholding as the wireless contact in the interlayer transmission diversity Candidate Set.
The interlayer transmission diversity control unit upgrades interlayer transmission diversity and surveys the step of collection and comprise the following steps: the interlayer transmission diversity control unit calculates the place-centric point of the wireless contact of Equations of The Second Kind in the interlayer transmission diversity active set, will be positioned at that the wireless contact of a plurality of Equations of The Second Kinds of predetermined radii scope collects as new interlayer transmission diversity detection around place-centric point.
Step S206 comprises the following steps: the interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set; The interlayer transmission diversity control unit sends needs with the data of the form transmission of interlayer transmission diversity according to the identifier of the wireless contact of Equations of The Second Kind in the interlayer transmission diversity active set after upgrading to the wireless contact of Equations of The Second Kind; And the wireless contact of Equations of The Second Kind in the wireless contact of the first kind and active set sends the wireless signal of carrying data to wireless terminal with diversity mode.
The below will describe one embodiment of the present of invention referring again to Fig. 1 and Fig. 3.With reference to Fig. 1, interlayer transmission diversity system 100 comprises in this embodiment: at least one first kind is wireless contact 102, at least one Equations of The Second Kind is wireless contact 104, the wireless terminal 106 that at least one can survey the first kind and the wireless contact of Equations of The Second Kind comprises an interlayer transmission diversity control unit 108 at least.The fundamental mode of interlayer transmission diversity system is: a wireless contact of the first kind and the wireless contact of one or more Equations of The Second Kind send following two kind information or two kind information one of in certain transmit diversity mode to the wireless terminal that is linked into first kind radio node in its coverage from different positions: control information under the control of interlayer transmission diversity control unit 108; Business datum.
Described Equations of The Second Kind radio node 104 is covered by the wireless contact of the first kind 102 or the overlay area 110 of the overlay area 112 of the wireless contact of Equations of The Second Kind and the wireless contact of the first kind exists overlapping;
Described first kind radio node 102 can be a complete base station, can be also a physical entity that only has antenna and radio frequency unit.
The antenna of the described first kind is wireless contact 102 can be a kind of of following antenna structure: omnidirectional antenna; Antenna (as fan antenna) with fixed-direction figure; Array antenna;
Described Equations of The Second Kind radio node 104 can be a complete base station, can be also a physical entity that only has antenna and radio frequency unit.
The antenna of described Equations of The Second Kind radio node 104 can be a kind of of following antenna structure: omnidirectional antenna; Antenna (as fan antenna) with fixed-direction figure; Array antenna;
Described Equations of The Second Kind radio node 104 sends its identifying informations, and these information can be to send on broadcast channel, can be also to send at the coding by pilot channel, can be also that the pseudo-mode with sequence that superposes sends;
The laying mode of the antenna of described Equations of The Second Kind radio node 104 can adopt following a kind of: outdoor laying; Indoor laying;
Described first kind radio node 102 with the space covering relation of the wireless contact of described Equations of The Second Kind is: the first kind is wireless, and contact 102 covers some Equations of The Second Kind WAP (wireless access point) 104, the Equations of The Second Kind WAP (wireless access point) 104 that perhaps exists some its overlay areas 112 and first kind coverage range of wireless access point 110 to overlap mutually.
Described first kind radio node 102 with the difference of the wireless contact 104 of described Equations of The Second Kind is: 1) usually, the first kind is wireless, and contact 102 has larger transmitting power with respect to the wireless contact 104 of Equations of The Second Kind, and Equations of The Second Kind is wireless, and contact 104 has the transmitting power of less; 2) usually, the antenna height of the wireless contact 102 of the first kind is greater than the antenna height of the wireless contact 104 of Equations of The Second Kind;
Link between described first kind radio node and the wireless contact of described Equations of The Second Kind can be following a kind of: fiber channel; The metal channel; Wireless channel;
Synchronous working in time between described first kind radio node and the wireless contact of described Equations of The Second Kind, in order to realize the needed synchronized relation of transmit diversity, as, realize single frequency network diversity mode or the empty minute required synchronized relation of emission diversity (STTD) between first kind radio node and the wireless contact of described Equations of The Second Kind.
The method that keeps in time synchronizeing between described first kind radio node and the wireless contact of described Equations of The Second Kind can adopt a kind of of following technology: it is all system with baseband processing unit that GPS simultaneous techniques, this technology are fit to first kind radio node and the wireless contact of described Equations of The Second Kind; The technology that CPRI (Common Public Radio Interface) Specification V3.0 (2006-10-20) provides, this technology are fit to the system that the wireless contact of the wireless contact of Equations of The Second Kind or first kind radio node and described Equations of The Second Kind adopts distributed radio-frequency antenna structure.
Interlayer transmission diversity control unit 108 is achieved as follows function: 1) the interlayer transmission diversity pattern determines, the interlayer transmission diversity control unit needs the following working method of first kind radio node and the wireless contact of described Equations of The Second Kind is determined at least: be to adopt Open-Loop Transmit Diversity, still adopt Closed-Loop Transmit Diversity; To adopt single frequency network SFN pattern or adopt empty minute emission diversity (STTD) pattern.Thisly determining it can is dynamically to carry out in real time, can be also disposable static a kind of hidden patterns of setting, as, only adopt the SFN pattern; 2) determine the set (interlayer transmission diversity is surveyed collection) of the wireless contact of Equations of The Second Kind that wireless terminal need to be surveyed, may be used for the Equations of The Second Kind node set (interlayer transmission diversity Candidate Set) of interlayer transmission diversity, be about to the Equations of The Second Kind node set (interlayer transmission diversity active set) for interlayer transmission diversity;
System is the geographical coordinate building database of the wireless contact of Equations of The Second Kind, keep strict corresponding relation between these geographical coordinates and the wireless point identifiers on it, interlayer transmission diversity control unit 108 utilizes the geographical coordinate of the wireless contact of Equations of The Second Kind and the detection collection that the corresponding relation between wireless point identifiers is dynamically determined wireless terminal;
Interlayer transmission diversity control unit 108 can be present in the different contacts of network neatly as a physical entity, as: realize intracardiac realization in Base-Band Processing in the base station; Both can be used as newly-increased functional unit and be connected on other network entities with physical equipment independently, also can improve realization on the transmit diversity administrative unit of existing system.
Wireless terminal 106 has the ability of access first kind radio node or the wireless contact of access Equations of The Second Kind, has the contact identification signal of surveying the wireless contact of Equations of The Second Kind in first kind radio node and the common frequency range of using of the wireless contact of Equations of The Second Kind, the ability of measuring its identification signal power level;
The changing method of wireless terminal 106 between the wireless contact 102 of the first kind is identical with traditional cell switching method;
When working in certain transmit diversity mode between first kind radio node and the wireless contact of described Equations of The Second Kind, require to be in access state between the wireless contact of wireless terminal and the first kind;
The wireless contact of the first kind has than large coverage, therefore the mobile terminal that accesses this contact can be avoided switching frequently, but due to signal propagation losses and decline, the wireless contact of the first kind is difficult to the spectrum efficiency that keeps high during to the wireless terminal the transmission of data of far-end; Equations of The Second Kind is wireless, and the contact coverage is little, need frequent the switching when providing service for mobile terminal, this frequent switching is easy to cause disconnecting (commercialization of PHS facts have proved this problem), but, the Equations of The Second Kind node is owing to arranging that density is large, always can keep nearer distance with mobile terminal, this just can obtain high spectrum efficiency and transmission rate.Basic ideas of the present invention are: use Equations of The Second Kind radio node and the wireless contact of the first kind in the mode of certain transmit diversity to the mobile terminal the transmission of data that accesses first kind contact.This mode has overcome the shortcoming when using a single class contact to provide business to terminal, takes full advantage of the advantage of the different nodes of two classes.
Fig. 3 shows the flow chart of the interlayer transmission diversity method of this embodiment.The method of this embodiment comprises the following steps:
Step S302, the interlayer transmission diversity control unit obtains the wireless terminal measurement result;
Wherein, at first interlayer transmission diversity control unit 108 issues to wireless terminal 106 and surveys the collection parameter, and detection collection parameter comprises a kind of of following parameter at least: survey the identification code of the wireless contact of Equations of The Second Kind in collection or the coded system of identification code, the frequency corresponding with identification code, time window and the metering system that carries out the active set detection;
The above-mentioned detection collection parameter that wireless terminal 106 contact wireless according to the first kind issues, following information is surveyed: whether the contact that 1) detects in the wireless contact detection of Equations of The Second Kind collection exists; 2) the wireless contact of the Equations of The Second Kind that detects is carried out signal strength measurement;
Wireless terminal is to the measurement to the wireless contact of Equations of The Second Kind in interlayer emission detection collection, and the mode that can trigger in the employing cycle also can adopt the mode of Event triggered.
Step S304, interlayer transmission diversity control unit upgrade the active set of the wireless contact of interlayer emission;
Wherein, the Equations of The Second Kind wireless interface dot information that interlayer transmission diversity control unit 108 reports according to wireless terminal 106, as: the identifier of the wireless contact of Equations of The Second Kind that detects; The pilot signal strength of the wireless contact of Equations of The Second Kind that detects, carry out the renewal of active set according to one of following principle: 1) signal interference ratio supreme principle, namely from the wireless contact of some Equations of The Second Kinds that wireless terminal detects, size according to signal interference ratio sorts, therefrom select the wireless contact of Equations of The Second Kind that several signal interference ratios surpass predetermined threshold as active set, use contact and the wireless contact of the first kind in active set jointly to realize transmit diversity; 2) path loss minimum principle, namely from the wireless contact of some Equations of The Second Kinds that wireless terminal detects, size according to path loss sorts, therefrom select several path losses less than the wireless contact of the Equations of The Second Kind of predetermined threshold as active set, use contact and the wireless contact of the first kind in active set jointly to realize transmit diversity.
Interlayer transmission diversity control unit 108 is on the basis of upgrading the transmit diversity active set, further according to certain principle, as signal interference ratio supreme principle or path loss minimum principle, carry out the renewal of transmit diversity Candidate Set, update method is: lower than transmit diversity active set thresholding but higher than the wireless contact of Equations of The Second Kind of transmit diversity Candidate Set thresholding as the wireless contact in Candidate Set;
Interlayer transmission diversity control unit 108 is on the basis of upgrading the transmit diversity active set, surveying collection upgrades, update method is: the place-centric point of the wireless contact 104 of Equations of The Second Kind in the computational activity collection, several Equations of The Second Kind WAP (wireless access point) of certain radius collect as new transmit diversity detection around this place-centric being positioned at.
The wireless contact of Equations of The Second Kind in step S306, the wireless contact of the first kind and active set is with certain diversity mode transmitting data;
Wherein, interlayer transmission diversity control unit 108 is according to the identifier of the wireless contact of Equations of The Second Kind in the transmit diversity active set after upgrading, send the data that need to send with the form of transmit diversity to these Equations of The Second Kind WAP (wireless access point), thereupon, the diversity mode that the wireless contact of the first kind and the wireless contact of Equations of The Second Kind are determined with interlayer transmission diversity control unit 108 sends the wireless signal that carries data to wireless terminal.
Fig. 4 illustrates the schematic diagram of interlayer transmission diversity system according to another embodiment of the present invention.In this embodiment, a double-deck mobile communication system with TDD mode work, 400 comprise: several first kind are wireless contact 402, and the first kind here is wireless, and contact 402 has adopted array antenna, and this array antenna can be worked in the mode of wave beam forming; Several Equations of The Second Kinds are wireless contact 404, the Equations of The Second Kind here is wireless, and contact adopts is omnidirectional antenna; Several wireless terminals 406, this terminal both can be surveyed measuring of the concentrated wireless contact of the first kind to switching, and also can utilize this terminal to realize the measurement of the wireless contact of Equations of The Second Kind that detection is concentrated to transmit diversity to switching the measurement capability of surveying the wireless contact of the first kind of concentrating; Corresponding baseband processor 414 of contact that each first kind is wireless, in baseband processor 414, except realizing the wireless contact of the first kind, the needed Base-Band Processing function of the wireless contact of Equations of The Second Kind, also realize being used for node communication and the control unit 416 of the communication and control between the wireless contact of Equations of The Second Kind and baseband processor 414, realized interlayer transmission diversity control unit 408.
Node communication and control unit 416 be according to shared common wireless interface standard CPRI (Common Public Radio Interface) Specification design, can realize easily synchronizeing between baseband processing unit (be in the CPRI standard wireless device control (REC) node) and the wireless contact of Equations of The Second Kind (be in the CPRI standard wireless device control (RE) node), transfer of data, mode of operation control.Here, the link of the first kind is wireless contact 402 and baseband processing unit can adopt the legacy link mode between array antenna and Base-Band Processing, but the link of the first kind is wireless contact 402 and baseband processing unit also can adopt and share common wireless interface standard CPRI and realize.
In this routine described two-layer system, some first kind are wireless, and contact 402 consists of the ground floor covering, in the zone that each first kind node 402 covers, have the wireless contact 404 of Equations of The Second Kind of some continuous coverings, the second layer of the double-deck mobile communication system of contact formation that these Equations of The Second Kinds are wireless covers.
A high speed mobile terminal that is linked into the wireless contact of the first kind is under the control of interlayer transmission diversity control unit 408, near the wireless contact 404 that may be used for interlayer transmission diversity it is surveyed, at A place, position, wireless terminal reports transmit diversity control unit 408 to result of detection by the up link between wireless terminal and the wireless contact of the first kind, and the result that transmit diversity control unit 408 reports according to wireless terminal 406 determines that the transmit diversity active set of this wireless terminal when the A of position comprises: Equations of The Second Kind contactless 404h, 404i, 404j.So transmit diversity control unit 408 uses 404h, 404i, these three contacts of 404j to match with the wireless contact of the first kind, realizes interlayer transmission diversity with the diversity mode of single frequency network.When wireless terminal 406 moved to B place, position, the measurement result that transmit diversity control unit 408 reports according to wireless terminal 406 determined that the transmit diversity active set of this wireless terminal when the B of position comprises: Equations of The Second Kind contactless 404k, 404l.So transmit diversity control unit 408 uses these two wireless contacts of 404k, 404l to match with the wireless contact of the first kind, realizes interlayer transmission diversity with the diversity mode of single frequency network.
In the present embodiment, the wireless contact of described Equations of The Second Kind utilizes the site resource of Personal Handyphone System (PHS:PersonalHandy-phone System) to install, and the site resource of utilization comprises following one or more: site, base station, supplied for electronic system, wire link, optical fiber contact.
The present embodiment provides as an example of the time division duplex two-layer system example, and the Frequency Division Duplexing (FDD) two-layer system also can realize interlayer transmission diversity according to same networking mode and active set metering system.
The present embodiment is to implement the transmit diversity of single frequency network mode with interlayer, according to same networking mode and active set metering system, also can implement the transmit diversity of other modes, divides the emission diversity as sky.
The present embodiment is to implement Open-Loop Transmit Diversity as example take interlayer, according to same networking mode and active set metering system, also can implement Closed-Loop Transmit Diversity.
The first kind that the present embodiment will cover greatly is wireless, and the contact switching times lacks the advantages high with the wireless contact spectrum efficiency of Equations of The Second Kind of little covering, and have following features: system has high spectrum efficiency when providing business to the wireless terminal that is in high-speed moving state; Overcome the shortcoming of transmission rate that the conventional wireless Access Network is difficult to be in to raising the terminal of cell edge region; Can be with multiple diversity mode work, particularly can be to realize easily the transmit diversity of single frequency network (bit synchronous, time synchronized, Frequency Synchronization) pattern, this diversity mode has good compatibility to existing terminal.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (15)
1. an interlayer transmission diversity system, comprise the wireless contact of the first kind, the wireless contact of Equations of The Second Kind and wireless terminal, it is characterized in that, comprising:
the interlayer transmission diversity control unit is used for obtaining the measurement result that described wireless terminal is measured the wireless contact of described Equations of The Second Kind, and upgrades the interlayer transmission diversity active set according to the described measurement result that described wireless terminal reports, and the interlayer transmission diversity pattern of determining the wireless contact of the described first kind and the wireless contact of one or more described Equations of The Second Kind, and control the wireless contact of the described first kind and the wireless contact of described one or more Equations of The Second Kind never co-located send information with the described interlayer transmission diversity pattern of determining to the described wireless terminal that is linked into the wireless contact of the described first kind in their coverages, wherein, the wireless contact of the described first kind is macro cell base station, the wireless contact of described Equations of The Second Kind is microcell base station, the wireless contact of described Equations of The Second Kind passes through broadcast channel, the coding of pilot channel, or send identifying information in the mode of stacking pseudorandom sequence.
2. system according to claim 1, is characterized in that, described interlayer transmission diversity control unit also is used for interlayer transmission diversity detection collection, interlayer transmission diversity Candidate Set and the interlayer transmission diversity active set that definite described wireless terminal need to be surveyed.
3. system according to claim 2, it is characterized in that, a described wireless contact of the described first kind and the wireless contact of one or more described Equations of The Second Kinds comprise one of control information and business datum with the described interlayer transmission diversity pattern of determining at least to the information that the described wireless terminal that is linked into the wireless contact of the described first kind in its coverage sends.
4. system according to claim 3, is characterized in that, the described first kind is wireless, and the contact covering wireless contact of described Equations of The Second Kind or the wireless contact of the described first kind and the wireless contact of described Equations of The Second Kind exist overlapping.
5. system according to claim 1, it is characterized in that, the transmitting power of the wireless contact of the described first kind is greater than the transmitting power of the wireless contact of described Equations of The Second Kind, and the antenna height of the wireless contact of the described first kind is greater than the antenna height of the wireless contact of described Equations of The Second Kind.
6. system according to claim 5, is characterized in that, the link between the wireless contact of the described first kind and the wireless contact of described Equations of The Second Kind is a kind of in fiber channel, metal channel and wireless channel.
7. system according to claim 6, is characterized in that, the wireless contact of the described first kind and the wireless contact of described Equations of The Second Kind be synchronous working in time.
8. system according to claim 2, it is characterized in that, described interlayer transmission diversity control unit utilizes the geographical coordinate of the wireless contact of described Equations of The Second Kind and dynamically determines to survey collection by the described interlayer transmission diversity that described wireless terminal need to be surveyed corresponding to the corresponding relation of the wireless point identifiers of described geographical coordinate.
9. an interlayer transmission diversity method, is characterized in that, comprises the following steps:
Step S202, interlayer transmission diversity control unit obtain the measurement result that wireless terminal is measured the wireless contact of Equations of The Second Kind;
Step S204, described interlayer transmission diversity control unit upgrades the interlayer transmission diversity active set according to the described measurement result that described wireless terminal reports; And
step S206, described interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of described Equations of The Second Kind in the wireless contact of the first kind and described active set, and the wireless contact of described Equations of The Second Kind in the wireless contact of the described first kind and described active set comes transmission information with described diversity mode, wherein, the wireless contact of the described first kind is macro cell base station, the wireless contact of described Equations of The Second Kind is microcell base station, the wireless contact of described Equations of The Second Kind passes through broadcast channel, the coding of pilot channel, or send identifying information in the mode of stacking pseudorandom sequence.
10. method according to claim 9, is characterized in that, described step S202 comprises the following steps:
Described interlayer transmission diversity control unit issues detecting parameter to described wireless terminal; And
Whether described wireless terminal exists according to the contact that described detecting parameter detects in the wireless contact detection of described Equations of The Second Kind collection, and measures the signal strength signal intensity of the wireless contact of detected described Equations of The Second Kind.
11. method according to claim 10 is characterized in that, described wireless terminal is measured the signal strength signal intensity of the wireless contact of detected described Equations of The Second Kind with cycle triggering mode or time triggering mode.
12. method according to claim 9, described step S202 comprises the following steps:
Described interlayer transmission diversity control unit upgrades described interlayer transmission diversity active set according to the information of the wireless contact of described Equations of The Second Kind that is reported by described wireless terminal according to signal interference ratio supreme principle or path loss minimum principle;
Described interlayer transmission diversity control unit upgrades the transmit diversity Candidate Set according to signal interference ratio supreme principle or path loss minimum principle; And
Described interlayer transmission diversity control unit upgrades interlayer transmission diversity and surveys collection.
13. method according to claim 12 is characterized in that, described interlayer transmission diversity control unit comprises the following steps according to the step of signal interference ratio supreme principle or path loss minimum principle renewal transmit diversity Candidate Set:
But described interlayer transmission diversity control unit will be lower than described interlayer transmission diversity active set thresholding higher than the wireless contact of Equations of The Second Kind of described interlayer transmission diversity Candidate Set thresholding as the wireless contact in described interlayer transmission diversity Candidate Set.
14. method according to claim 12 is characterized in that, the step that described interlayer transmission diversity control unit upgrades interlayer transmission diversity detection collection comprises the following steps:
Described interlayer transmission diversity control unit calculates the place-centric point of the wireless contact of described Equations of The Second Kind in described interlayer transmission diversity active set, will be positioned at that the wireless contact of a plurality of described Equations of The Second Kind of predetermined radii scope collects as new described interlayer transmission diversity detection around described place-centric point.
15. method according to claim 14 is characterized in that, described step S206 comprises the following steps:
Described interlayer transmission diversity control unit is determined the diversity mode of the transmitting data between the wireless contact of described Equations of The Second Kind in the wireless contact of the described first kind and described active set;
Described interlayer transmission diversity control unit sends needs with the data of the form transmission of interlayer transmission diversity according to the identifier of the wireless contact of described Equations of The Second Kind in the described interlayer transmission diversity active set after upgrading to the wireless contact of described Equations of The Second Kind; And
The wireless contact of described Equations of The Second Kind in the wireless contact of the described first kind and described active set sends the wireless signal of the described data of carrying to described wireless terminal with described diversity mode.
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| CN1284249A (en) * | 1997-11-26 | 2001-02-14 | 艾利森电话股份有限公司 | Multistage diversity handling for mobile telecommunications |
| CN1902868A (en) * | 2003-12-30 | 2007-01-24 | 艾利森电话股份有限公司 | Method and system for wireless communication networks using cooperative relaying |
| CN1901400A (en) * | 2005-07-04 | 2007-01-24 | 三星电子株式会社 | Cooperative relay transmission technique for wireless communication system |
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| US5546443A (en) * | 1992-10-26 | 1996-08-13 | Ericsson Ge Mobile Communications, Inc. | Communication management technique for a radiotelephone system including microcells |
| CN1284249A (en) * | 1997-11-26 | 2001-02-14 | 艾利森电话股份有限公司 | Multistage diversity handling for mobile telecommunications |
| CN1902868A (en) * | 2003-12-30 | 2007-01-24 | 艾利森电话股份有限公司 | Method and system for wireless communication networks using cooperative relaying |
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