CN101621866B - Method for expanding coverage radius of cell - Google Patents
Method for expanding coverage radius of cell Download PDFInfo
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- CN101621866B CN101621866B CN2008100398333A CN200810039833A CN101621866B CN 101621866 B CN101621866 B CN 101621866B CN 2008100398333 A CN2008100398333 A CN 2008100398333A CN 200810039833 A CN200810039833 A CN 200810039833A CN 101621866 B CN101621866 B CN 101621866B
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Abstract
The invention discloses a method for expanding the coverage radius of a cell, which comprises the following steps: enabling a terminal to carry out communication in a connection state, measuring the loopback time TT of the terminal on a network side, and dispatching the allocation of an uplink pilot-frequency time slot and a downlink pilot-frequency time slot of the terminal according to mutual relationship of the loopback time TT and protective interval delaying continuation time TGP of the cell. The emittance from the terminal and the emittance to the terminal are restricted by the uplink pilot-frequency time slot and the downlink pilot-frequency time slot. The method can effectively expand the coverage radius of the cell. The problem that the coverage radius of the cell is reduced when the emittance time of the terminal is previously controlled in the prior art can be solved according to the method.
Description
Technical field
The present invention relates in the TDD radio communication system, dispatch the method that enlarges coverage radius of cell by up-downgoing.
Background technology
Follow mobile network's extensive popularizing in the past twenty years such as GSM, global voice communication service has obtained great success.At present, Quan Qiu mobile voice user has surpassed 1,800,000,000.Simultaneously, people's communication custom also evolves to the person to person from the past point-to-point (Place to Place).The fast development of personal communication has impelled greatly that the personal communication devices's is microminiaturized and diversified, in conjunction with the ability of data services such as Multimedia Message, game on line, video request program, music download and mobile TV, satisfied the demand of personal communication and amusement greatly.
In addition, utilize network to provide as far as possible and calculate and storage capacity, be sent to terminal, will help the microminiaturization of personal communication amusement equipment and popularize by broadband wireless cheaply.The GSM network evolves to GPRS/EDGE and WCDMA/HSDPA network so that more diversified communications and entertainment business to be provided, and reduces the operation cost of radio data network, has become the only way which must be passed of GSM mobile operator.But this also only is a beginning toward the evolution of broadband wireless technology.WCDMA/HSDPA compares with GPRS/EDGE, and wireless performance enlarges greatly.
At present, mobile radio system develops to broadband, portable direction, and communication terminal has been proposed high data bandwidth, low complex degree, low battery power consumption, and the requirement of spectral efficient.The use of OFDM/OFDMA technology has reduced the implementation complexity of wide-band communication system.
Orthogonal frequency division multiplexi, promptly the OFDM technology has been acknowledged as the first-selected transmission technology that surpasses three generations and four-tape WiMAX mobile communication.(Frequency division multiplex access FDMA), has just constituted the orthogonal frequency division multiplexing multiple access technology, i.e. the OFDMA technology at the multiplexing multiple access in the basic enterprising line frequency territory of OFDM.In common OFDMA technology, whole communication bandwidth is divided into many subcarriers, and it is right that each subcarrier can be distributed to certain sender-receiver separately, can be used for point-to-multipoint (point to multipoint, PMP) or point-to-point (point to point, P2P) communication system.Common cellular communication system is a point-to-multipoint communication system, single sender (such as the base station) can be simultaneously to one or more receivers (such as mobile phone) transmission information, one or more senders (such as mobile phone) also can be simultaneously to single receiver (such as the base station) transmission information, wherein a plurality of receivers or a plurality of sender take different subcarrier allocation orthogonal on the frequency domain respectively, become the OFDM/OFDMA system.The Long Term Evolution of typical application such as 3GPP (Long term evolution, LTE) down link of system.
The main performance target of 3GPP LTE project comprises: the peak rate that descending 100Mbps, up 50Mbps can be provided in the 20MHz spectral bandwidth; Improve the performance of Cell Edge User; Enlarge cell capacity; Reduce system delay, the inner unidirectional transmission time delay of user plane is lower than 5ms, and control plane is lower than 50ms from sleep state to the state of activation transit time, and the transit time from the resident state to the state of activation is less than 100ms; Support the sub-district of 100Km radius to cover; Can provide for 350Km/h high-speed mobile user＞access service of 100kbps; Support paired or non-paired frequency spectrum, but and flexible configuration 1.25MHz to the 20MHz various bandwidth.
In order to realize the above-mentioned target capabilities of 3G LTE system, need to improve and the air interface technologies and the network configuration that strengthen existing 3G system.In December, 2005, approval employing OFDM and MIMO scheme are as the sole criterion of its wireless network evolution (LTE) through heated discussion in 3GPP standardization body.LTE system core net adopts two-layer flat network architectures simultaneously, by four main network elements of NodeB, RNC, SGSN, GGSN in WCDMA/HSDPA stage, is evolved to eNodeB (eNB) and two main network elements of IAD (aGW).Core net adopts the all-IP distributed frame simultaneously, supports various advanced technologies.
The OFDM technology is the technical foundation and the main feature of LTE system, the ofdm system parameter setting can produce decisive influence to the performance of whole system, wherein the carrier spacing is again the basic parameter of ofdm system, more finally is defined as 15kHz through theory analysis and emulation.The least resource piece of up-downgoing is 375kHz, 25 subcarrier widths just, and data can adopt concentrated (localized) mode or discrete (distributed) mode to the mapping mode of Resource Block.The length of Cyclic Prefix Cyclic Prefix (CP) has determined the ability of anti-multipath and the covering power of ofdm system.Long CP is beneficial to and overcomes multipath and disturb, and support to cover on a large scale, but overhead also can correspondingly increase, and causes data transmission capabilities to descend.In order to reach the covering requirement of radius of society 100Km, the LTE system adopts long and short two cover cyclic prefix scheme, selects according to concrete scene: short CP scheme is a most basic option, and long CP scheme is used to support LTE to cover and many cell broadcaste services the sub-district on a large scale.
It is the subject matter that the LTE down link need solve that peak value transmits defeated rate.In order to realize the target of system descending 100Mbps peak rate, on the original QPSK of 3G, 16QAM basis, the LTE system has increased the 64QAM high order modulation.The matter of utmost importance that the LTE up direction is paid close attention to is the control peak-to-average force ratio, reduces terminal cost and power consumption, mainly considers to adopt displacement BPSK and two kinds of schemes of frequency domain filtering further to reduce the peak-to-average force ratio of up SC-FDMA at present.LTE is also considering to use advanced low density parity check code except continuing to adopt the ripe Turbo chnnel coding.
3GPP LTE Access Network also needs to satisfy low time delay, low complex degree, requirement cheaply when can effectively supporting new physical layer transmission technology.Original network configuration obviously can't meet the demands, need adjust and evolution.In the meeting in March, 2006,3GPP has determined the structure of E-UTRAN, Access Network mainly is made of evolved eNodeB (eNB) and IAD (aGW), and this similar adopts this structure to produce far-reaching influence to the architectural framework of 3GPP system in typical IP broadband network structure.ENodeB is on NodeB original function basis, has increased the functions such as physical layer, MAC layer, RRC, scheduling, access control, carrying control, mobile management and inter-cell RRM of RNC.AGW can be regarded as a boundary node, as the part of core net.
The TE system has defined 5 kinds of down channels at present: Physical Downlink Shared Channel PDSCH, Physical Broadcast Channel PBCH, Physical Multicast Channel PMCH, Physical Control Format Indicator Channel PC-FICH, physical downlink control channel PDCCH.
System has also defined 3 kinds of uplink physical channels: Physical Random Access Channel PRACH, Physical Uplink Shared Channel PUSCH, Physical Uplink Control Channel PUCCH.
In present time division duplex (TDD, time division duplex) wireless communication system, timing advance (TA) is used to remedy the turnaround time (RTT) that wireless signal transmits between base station and terminal.Its principle is shown in Fig. 1 a～1c.
Fig. 1 a is the radio frames form.The short frame format of LTE in the TDD mode is an example, and the radio frames of time domain 5ms is divided into the time slot of 5 1ms, is numbered 0,1,2,3,4 respectively.Wherein 0 time slot is a descending time slot, and 2 time slots are ascending time slots, and what the configuration of 3 time slots and 4 time slots can be for " go up on ", " up and down ", " following " three kinds of configuration modes is a kind of.That selects for use among Fig. 1 a is configured to " up and down ", at 3 time slots and 4 time slot intersections individual up-downgoing transfer point is arranged.In addition, 1 time slot is divided into descender (DwPTS, Downlink pilot time slot), and the protection interval (GP, GuardPeriod), three parts of ascender (UpPTS, Uplink pilot time slot).
What deserves to be mentioned is that in the TDD system special time slot, DwPTS accounts for maximum 5 OFDM symbols, be used for transmitting downstream control and data; UpPTS accounts for 1-2 OFDM symbol, is used for transmitting downstream control and data; These symbols are that terminal is shared.Wherein, a free-revving engine of 2 the OFDM symbols in back is exactly to be used for launching up reference signal the scheduling that is used for network measure terminal uplink signal-channel quality and carries out upward signal among the UpPTS.Scheduling for up reference signal is a unit according to the OFDM symbol, and promptly network can be dispatched particular terminal and in the end launches on any one in 2 OFDM symbols or two symbols.
In practical communication, (NodeB) is sent to terminal (UE) a propagation delay Tp arranged wireless signal from the base station, and shown in Fig. 1 c, at this moment the ascender since 1 time slot needs Timing Advance Ta, and 1, remedy a time delay Tp.
(robust) is relatively poor for the robustness of this technology.Reason has two: at first, Timing Advance Ta, the 1st, to come out according to the upward signal location estimation that receives by the base station, precision is limited; In order to simplify the control signaling complexity of Timing Advance, often adopt 1 bit control signal simultaneously, pass on stepping, step to move back information.Like this, timing position have one partially before or partially after fluctuation range, it is overlapping on time domain with the transmission downstream signal to cause base station side to receive up transmission signal under the situation that fluctuate in the back partially therein, shown in Fig. 1 b bend dash area, influences the reception of base station to upward signal afterbody part.Secondly, adopt reception in the base station, send under the situation of time division duplex, the base station need be converted to transmit status from accepting state between 3 time slots and 4 time slots in Fig. 1 b, need reception-transmission interval change-over time (RTG, otherwise can influence the base station to the reception of upward signal afterbody part or influence the base station Receive/transmit Transition Gap), to the transmission partly of downstream signal head.
A kind of solution that has proposed is, NodeB sends Timing Advance Ta, and 2 give U E, Ta wherein, 2=Ta, 1+Tg.Ta; 2 are made up of two parts; Ta wherein, 1=2*Tp is wireless signal propagation time back and forth aloft; Tg wherein is the guard time interval; control Ta by NodeB according to NodeB, the reception of NodeB under the variance of 1 precision and the TDD duplex mode-transmission is selected change-over time, makes the receiving and transmitting signal of NodeB side shown in Fig. 1 c; wherein reserve the segment protect time (Guard part) in the middle of 3 time slots and 4 time slots, to reduce the negligible degree that interferes with between the receiving and transmitting signal.
Because GP's is big or small limited in the frame structure, and the terminal of cell edge needs the more propagation time, so the length of GP has determined the maximum border of sub-district.For the method for revising emission time initial lead, terminal signaling need launched according to the sub-district needs, though can reach the purpose of avoiding uplink and downlink signals to disturb.But, because Tg has taken the time of GP, make actual GP reduce, must reduce the covering radius of sub-district.
Summary of the invention
For this reason, the present invention proposes a kind of method that enlarges coverage radius of cell.
A kind of method that enlarges coverage radius of cell proposed by the invention may further comprise the steps:
Terminal is communicated in coupled situation;
Measure the Loop Round Trip Time TT of this terminal at network side;
According to the protection of this Loop Round Trip Time TT and sub-district at interval perdurabgility TGP a correlation determine the distribution of the uplink pilot time slot and the descending pilot frequency time slot of this terminal, wherein:
If TT * 3≤TGP, then network distributes the uplink pilot time slot and the descending pilot frequency time slot of this terminal according to an established methodology; Otherwise network distributes the uplink pilot time slot and the descending pilot frequency time slot of this terminal according to a constrained procedure.
In one embodiment, network distributes the uplink pilot time slot of this terminal and the step of descending pilot frequency time slot to comprise according to a constrained procedure:
Dispatching this terminal does not launch at uplink pilot time slot.
In one embodiment, send 2 OFDM symbols, then retrain this terminal and do not send uplink reference symbol at uplink pilot time slot if TGP+TS≤TT * 3≤TGP+2TS and cell configuration are uplink pilot time slot; Wherein TS is an OFDM symbol lengths of forming uplink pilot time slot and descending pilot frequency time slot.
In one embodiment, send 1 OFDM symbol, then retrain this terminal and do not send uplink reference symbol at uplink pilot time slot if TT * 3≤TGP+TS and cell configuration are uplink pilot time slot; Wherein TS is an OFDM symbol lengths of forming uplink pilot time slot and descending pilot frequency time slot.
In one embodiment, network distributes the uplink pilot time slot of this terminal and the step of descending pilot frequency time slot to comprise according to a constrained procedure:
Dispatching this terminal only launches at last OFDM symbol of uplink pilot time slot.
In one embodiment, send 2 OFDM symbols, then retrain this terminal OFDM symbol transmission uplink reference symbol in the end if TT * 3≤TGP+TS and cell configuration are uplink pilot time slot; Wherein TS is an OFDM symbol lengths of forming uplink pilot time slot and descending pilot frequency time slot.
In one embodiment, network distributes the uplink pilot time slot of this terminal and the step of descending pilot frequency time slot to comprise according to a constrained procedure:
Do not launch data to this terminal at descending pilot frequency time slot.
Therefore, by retraining self terminal at uplink pilot time slot and descending pilot frequency time slot and to the emission of terminal, the present invention can effectively enlarge coverage radius of cell.In addition, the method according to this invention can solve in the prior art control terminal in advance can cause the covering radius of sub-district to reduce in the time of launch time problem.
Description of drawings
Fig. 1 a～1c is prior art remedies RTT with timing advance a time slot format schematic diagram.
Fig. 2 is the method flow diagram that enlarges coverage radius of cell according to an embodiment of the invention.
Fig. 3 is the distribution method flow chart that retrains according to an embodiment of the invention.
Embodiment
Main method of the present invention is for launching at the uplink pilot time slot (UpPTS) of protection interval GP (time slot 1) and/or ODFM (OFDM) symbol of descending pilot frequency time slot (DwPTS) by the network scheduling particular terminal; increase actual GP, thereby enlarge the covering radius of sub-district.
In the present invention, related system comprises time division duplex (TDD) wireless communication system.Terminal wireless inserts the sub-district, and communicates with the cordless communication network with base station.
In the special time slot of the TDD system that embodiment below is related, DwPTS accounts for maximum 5 OFDM symbols, is used for transmitting downstream control and data; UpPTS accounts for 1-2 OFDM symbol, is used for transmitting downstream control and data; These symbols are that terminal is shared.Wherein, a free-revving engine of 2 the OFDM symbols in back is exactly to be used for launching up reference signal the scheduling that is used for network measure terminal uplink signal-channel quality and carries out upward signal among the UpPTS.Scheduling for up reference signal is a unit according to the OFDM symbol, and promptly network can be dispatched particular terminal and in the end launches on any one in 2 OFDM symbols or two symbols.If the protection of Serving cell at interval GP perdurabgility be TGP, the Loop Round Trip Time of terminal is TT.
With reference to shown in Figure 2, method comprises the steps: according to an embodiment of the invention
In step 201, terminal is carried out normal communication in coupled situation;
In step 202, measure the Loop Round Trip Time TT of this terminal at network side;
In step 203, relatively TT and protection at interval GP perdurabgility TGP relativeness, specific to saying, relatively TT * 3 and TGP;
In step 204, if TT * 3≤TGP, network can distribute the DwPTS and the UpPTS of counterpart terminal according to established methodology.That is to say that network can be dispatched according to original needs of system.
In step 205, if TT * 3 〉=TGP, network can adopt the distribution method of constraint to dispatch uplink and downlink timeslot.
In one embodiment, the concrete grammar of step 205 can further comprise:
(1) for UpPTs, the scheduling counterpart terminal is not launched at UpPTs; Perhaps for the UpPTs of 2 symbols, the scheduling counterpart terminal only in the end a symbol launch;
(2), can not launch data to counterpart terminal at the DwPTS data field for DwPTS.
Above step (1), (2) can adopt simultaneously, perhaps select one of them employing.
Fig. 3 is the distribution method realization flow figure that retrains according to an embodiment of the invention.In the step below, TS is the time span of an OFDM symbol.
With reference to shown in Figure 3, in step 203, if TT * 3≤TGP, then execution in step 204, otherwise enter step 301.
In step 204, network can distribute the DwPTS and the UpPTS of counterpart terminal according to established methodology, enters step 310 then, finishes.
In step 301, can further judge TT * 3 and the relation of TGP+TS and the configuring condition of UpPTS.If TT * 3≤TGP+TS, and cell configuration is that UpPTS sends 2 OFDM symbols, then step 302 constraint counterpart terminal in the end an OFDM symbol send uplink reference signals, enter step 310 then.
In step 303, can further judge TT * 3 and the relation of TGP+2 * TS and the configuring condition of UpPTS.If TGP+TS≤TT * 3≤TGP+2 * TS, and cell configuration is that UpPTS sends 2 OFDM symbols, then do not send uplink reference signals at step 304 constraint counterpart terminal at UpPTS, enters step 310 then.
Then, can further judge TT * 3 and the relation of TGP+TS and the configuring condition of UpPTS in step 305.If TT * 3≤TGP+TS, and cell configuration is that UpPTS sends 1 OFDM symbol, then do not send uplink reference signals at step 306 constraint counterpart terminal at UpPTS, enters step 310 then.Otherwise, constraint network not in DwPTS data field launch data to counterpart terminal, enter step 310 then.
Therefore, the above embodiment of the present invention sends in the transmission of the OFDM of uplink pilot time slot symbol and/or the data to terminal in descending pilot frequency time slot by about beamsplitter terminal, can avoid causing launch time the covering radius of sub-district to reduce owing to shifting to an earlier date control terminal.And can utilize method of the present invention to enlarge coverage radius of cell.
It is above that what disclose is preferred embodiment of the present invention, but these embodiment are not in order to limit the present invention, any those skilled in the art, various equivalent modifications and the variation done without departing from the spirit and scope of the present invention all should be included in and work as with in the claim that claims were defined.
Claims (1)
1. method that enlarges coverage radius of cell comprises:
Terminal is communicated in coupled situation;
Measure the Loop Round Trip Time TT of this terminal at network side;
According to the protection of this Loop Round Trip Time TT and sub-district at interval perdurabgility TGP the correlation distribution of dispatching the uplink pilot time slot and the descending pilot frequency time slot of this terminal, wherein,
If TT * 3≤TGP, then network distributes the uplink pilot time slot and the descending pilot frequency time slot of this terminal according to an established methodology;
Otherwise network distributes the uplink pilot time slot and the descending pilot frequency time slot of this terminal according to a constrained procedure, and it comprises:
If being uplink pilot time slot, TGP+TS≤TT * 3≤TGP+2TS and cell configuration send 2 OFDM symbols, if perhaps TT * 3≤TGP+TS and cell configuration are that uplink pilot time slot sends 1 OFDM symbol, then retrain this terminal and do not send uplink reference symbol at uplink pilot time slot; Perhaps
Send 2 OFDM symbols if TT * 3≤TGP+TS and cell configuration are uplink pilot time slot, then retrain this terminal OFDM symbol transmission uplink reference symbol in the end; Perhaps
Do not launch data to this terminal at descending pilot frequency time slot;
Wherein TS is an OFDM symbol lengths of forming uplink pilot time slot and descending pilot frequency time slot.
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| CN2008100398333A CN101621866B (en) | 2008-06-30 | 2008-06-30 | Method for expanding coverage radius of cell |
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| CN2008100398333A CN101621866B (en) | 2008-06-30 | 2008-06-30 | Method for expanding coverage radius of cell |
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| CN101621866B true CN101621866B (en) | 2011-08-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913418A (en) * | 2005-08-08 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for supporting changable cover by time division duplex system |
| CN101005305A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Transmitting method for time division duplex mobile communication system |
| CN101197803A (en) * | 2006-12-04 | 2008-06-11 | 华为技术有限公司 | Method, device and system for data transmission in TDD system |
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- 2008-06-30 CN CN2008100398333A patent/CN101621866B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913418A (en) * | 2005-08-08 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for supporting changable cover by time division duplex system |
| CN101005305A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Transmitting method for time division duplex mobile communication system |
| CN101197803A (en) * | 2006-12-04 | 2008-06-11 | 华为技术有限公司 | Method, device and system for data transmission in TDD system |
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