CN101610578A - Avoid receiving and sending the method and system of interference - Google Patents
Avoid receiving and sending the method and system of interference Download PDFInfo
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- CN101610578A CN101610578A CNA2008100392799A CN200810039279A CN101610578A CN 101610578 A CN101610578 A CN 101610578A CN A2008100392799 A CNA2008100392799 A CN A2008100392799A CN 200810039279 A CN200810039279 A CN 200810039279A CN 101610578 A CN101610578 A CN 101610578A
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Abstract
The present invention discloses a kind of method and system of avoiding signal to send and receive interference.The method may further comprise the steps: structure comprises an information unit, and this information unit contains sub-district up-downgoing switching point information; Send the signaling that comprises described information unit to terminal by broadcast channel; Whether the transmission time slot that is assigned with according to terminal is the last time slot by the up-downgoing switching point of described sub-district up-downgoing switching point information indication, determine whether terminal uses the special time slot form to carry out up emission, wherein said special time slot form make terminal last at least one transmission symbol of subframe of up emission be not sent out.Avoided the uplink and downlink signals collision problem of base station thus.
Description
Technical field
The present invention relates in the TDD radio communication system, avoid receiving and sending the method and system of interference by special time slot emission and setting.
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 improves 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; Improve 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).
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.
Summary of the invention
For this reason, the present invention proposes a kind of method and system of avoiding signal to send and receive interference.
A kind of method of avoiding signal to send and receive interference proposed by the invention, may further comprise the steps: make up an information unit, this information unit contains sub-district up-downgoing switching point information; Send the signaling that comprises described information unit to terminal by broadcast channel; Whether the transmission time slot that is assigned with according to terminal is the last time slot by the up-downgoing switching point of described sub-district up-downgoing switching point information indication, determine whether terminal uses the special time slot form to carry out up emission, wherein said special time slot form make terminal last at least one transmission symbol of subframe of up emission be not sent out.
In above-mentioned method, when the transmission time slot that is assigned with when terminal is the last time slot of up-downgoing switching point, determine that terminal is to use the special time slot form to carry out up emission.
In above-mentioned method, information unit also can comprise sub-district special time slot format information, and the step that makes up information unit comprises, if the sub-district does not allow to adopt the special time slot form to launch, sub-district special time slot format information then is set for closing, if the sub-district allows to adopt the special time slot form to launch, sub-district special time slot format information then is set for starting.
In above-mentioned method, also comprise according to sub-district special time slot format information and determine whether terminal adopts the special time slot form, when sub-district special time slot format information is the last time slot of up-downgoing switching point for the transmission time slot that starts and terminal is assigned with, determine that terminal is to use the special time slot form to carry out up emission.
In above-mentioned method, formation one protection is as the criterion the quantity of last at least one transmission symbol that does not send at interval between the forward and backward time slot of a up-downgoing switching point to satisfy.
In above-mentioned method, the step that sends signaling by broadcast channel comprises that whole terminals send signaling in the sub-district.
In addition, the present invention proposes a kind of system that avoids signal to send and receive interference, comprising: the base station makes up one and contains the information unit of sub-district up-downgoing switching point information, and comprises the signaling of described information unit by broadcast channel to the terminal transmission; At least one terminal, receive described signaling from described broadcast channel, whether according to the transmission time slot that is assigned with is last time slot by the up-downgoing switching point of described sub-district up-downgoing switching point information indication, determine whether to use the special time slot form to carry out up emission, wherein said special time slot form make described terminal last at least one transmission symbol of subframe of up emission be not sent out.
The invention solves the information that the sub-district notifies terminal related network up-downgoing switching point and sub-district whether to adopt the special time slot form to launch in broadcast channel, make the structure of time slot that terminal in the sub-district can controlled emission meets the demands, promptly avoided the waste of frequency resource to avoid the problem of uplink and downlink signals conflict again.
Description of drawings
Fig. 1 a～1c is prior art remedies RTT with timing advance a time slot format schematic diagram.
Fig. 2 a～2d is a time slot format schematic diagram of avoiding base station side to receive and send interference according to of the present invention.
Fig. 3 shows the base station side handling process of avoiding receiving and send the method for interference according to of the present invention.
Fig. 4 A shows end side handling process according to an embodiment of the invention.
Fig. 4 B shows end side handling process according to another embodiment of the present invention.
Fig. 5 shows according to base station and the terminal communication flow process of avoiding receiving and sending interference method of the present invention.
Fig. 6 shows according to the system that avoids receiving and sending interference of the present invention.
Embodiment
According to method proposed by the invention, the base station is when assigning uplink transmission resource, according to protection interval (T
G) requirement, decide up-downgoing transfer point place, sub-frame of uplink last or a plurality of transmission symbol do not send, referred to herein as " punching ".At N
*T
CP+OS〉=T
GUnder the situation, can guarantee the negligible degree that interferes with between the base station transceiver signal, wherein N is the symbol numbers of punching, T
CP+OSIt is the time of each transmission symbol.
At first please refer to shown in Fig. 2 a～2d, still 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.At 3 time slots and 4 time slot intersections is up-downgoing transfer point (switching point), yet when 3 time slots and 4 time slots adopted other configuration mode, the up-downgoing transfer point also can appear at 2 time slots and 3 time slot intersections, does not limit at this.In addition, 1 time slot is divided into descender (DwPTS, Downlink pilot time slot), and protection is (GP, Guard Period) at interval, three parts of ascender (UpPTS, Uplink pilot time slot).
In practical communication, wireless signal is sent to terminal from the base station have a propagation delay Tp, shown in Fig. 2 c, at this moment since the ascender of 1 time slot still with lead Ta, 1, remedy a time delay Tp.Further; up-downgoing transfer point place in 3 time slots and 4 time slots boundary; with last at least one transmission symbol of the last time slot 3 of transfer point (shown in the figure one) punching; promptly do not send; between ascending time slot 3 and descending time slot 4, reserving satisfactory protection at interval, thereby avoid the reception of base station side and send interference between signals.
The configuration of information can be carried out at the part or all of terminal in the sub-district in the base station, these information comprise " sub-district up-downgoing switching point " information, perhaps also comprise " whether the sub-district adopts the special time slot form to launch " information (referred to herein as sub-district special time slot format information), terminal can determine voluntarily whether sub-frame of uplink adopts the special time slot form according to these information.Specify as follows:
At first, with reference to shown in Figure 3, the treatment step of base station side is as follows:
Step 301: make up an information unit, in one embodiment, this information unit contains " sub-district up-downgoing switching point " information, and in another embodiment, this information unit further contains " whether the sub-district adopts the special time slot form to launch " information.Following illustration is according to 2 kinds of information unit structure of present embodiment.
{
Sub-district up-downgoing switching point information (2bits)
}；
{
Sub-district special time slot format information (1bit)
Sub-district up-downgoing switching point information (2bits)
}。
Wherein " sub-district special time slot format information " information=1 expression sub-district allows to adopt the special time slot form to launch; " sub-district special time slot format information " information=0 expression sub-district does not allow to adopt the special time slot form to launch.
For frame structure shown in Fig. 2 a～2d:
Expression last sub-frame of uplink in " sub-district up-downgoing switching point "=0 is the 2nd subframe (is subframe 3,4 is descending);
" sub-district up-downgoing switching point "=1 last sub-frame of uplink of expression is the 3rd subframe (being that subframe 4 is for descending);
" sub-district up-downgoing switching point "=other value representations are meaningless.
What deserves to be mentioned is that for other frame structures, " sub-district up-downgoing switching point " information can have more bits, and has most values to indicate the switching point position.
Above-mentioned information unit can constitute a signaling separately, also can be included in other the signaling.
Afterwards, in step 302, in broadcast channel, transmit the signaling comprise above-mentioned information unit part or all of terminal to the sub-district.
The configuration of above-mentioned information unit can be according to cell conditions when the sub-district be set up and/or according to cell configuration situation (particularly up-downgoing ratio) variation moment flexible configuration.
Correspondingly, shown in Fig. 4 A, only comprise at signaling structure among the embodiment of " sub-district up-downgoing switching point " information, the end side handling process is:
Step 401: receive broadcast signaling information.
Step 402: the relation between the indicated up-downgoing switching point of transmission time slot that is assigned with according to terminal and the sub-district up-downgoing switching point information in the signaling, determine whether terminal uses the special time slot form to carry out up emission.
Accept above-mentioned, if the transmission time slot that terminal is assigned with is the last time slot (for example time slot 3 among Fig. 2 c) of up-downgoing switching point, then terminal is determined to adopt special time slot form (step 403), otherwise terminal determines to adopt general time slot format to launch (step 404).
Comprise in message structure among another embodiment of " sub-district up-downgoing switching point " information and sub-district special time slot format information, end side is handled slightly different, and shown in Fig. 4 B, wherein identical label is represented identical step, and flow process is as follows:
Step 401: receive broadcast signaling information.
Step 412: judge earlier according to sub-district special time slot format information,, then enter step 402,, then directly enter step 404 if the sub-district does not allow to adopt the special time slot form if the sub-district allows to adopt the special time slot form.
In step 402～404, terminal still can be judged according to sub-district up-downgoing switching point information, and whether decision adopts the special time slot form to carry out up emission.
Please refer to Fig. 5, it shows according to base station and the terminal communication flow process of avoiding receiving and sending interference method of the present invention.In step 501, it is synchronous that terminal (UE) is at first finished the sub-district, then in step 502, initiates access procedure according to ICQ or local high-level signaling, afterwards, and the Timing Advance T that base station (EnodeB) needs in step 503 estimation
A, 1(shown in Fig. 2 c).Then, enter step 504, interval T can be estimated to protect in the base station
G, then in step 505 according to T
GDetermine the punching symbol numbers, and tell terminal punching symbol numbers (step 506) by signaling.Afterwards, terminal continues and base station proper communication (step 507), up to sign off (step 508).
In the communication process of step 507, terminal can adopt corresponding emission form according to aforementioned established decision.When definite terminal is when adopting the special time slot form to launch; shown in Fig. 2 a～2d; the time slot that terminal is launched is the previous time slot 3 of switching point; the transmission symbol of its some can not be sent out; have between the descending time slot 4 of ascending time slot 3 that therefore base station received and transmission at interval, to avoid the interference between the two by the formed protection of the transmission symbol that is perforated.Otherwise, if the transmission time slot that terminal is assigned with is not the last time slot of up-downgoing switching point, for example be the time slot 2 among Fig. 2 c, then only need to adopt general time slot format to launch.
On the other hand, with reference to shown in Figure 6, the present invention proposes to have at least the TDD radio communication system 10 of base station 100 and terminal 200, disturbs with transmission and the reception of avoiding base station side.Wherein base station 100 issue by broadcast channel comprise sub-district up-downgoing switching point information (perhaps also have sub-district special time slot format information) signaling to one or more terminals 200, terminal is carried out time slot format in view of the above and is handled, and uploads data to the base station 100 with base station communication the time.Other details of native system are disclosed among aforesaid other embodiment in detail, thereby do not repeat them here.
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 (12)
1, a kind of method of avoiding signal to send and receive interference comprises:
Make up an information unit, this information unit contains sub-district up-downgoing switching point information;
Send the signaling that comprises described information unit to terminal by broadcast channel;
Whether the transmission time slot that is assigned with according to terminal is the last time slot by the up-downgoing switching point of described sub-district up-downgoing switching point information indication, determine whether terminal uses the special time slot form to carry out up emission, wherein said special time slot form make terminal last at least one transmission symbol of subframe of up emission be not sent out.
2, the method for claim 1 is characterized in that, when the transmission time slot that is assigned with when terminal is the last time slot of up-downgoing switching point, determines that described terminal carries out up emission for using the special time slot form.
3, the method for claim 1, it is characterized in that, described information unit also comprises sub-district special time slot format information, the step that makes up described information unit comprises, if the sub-district does not allow to adopt the special time slot form to launch, described sub-district special time slot format information then is set for closing,, described sub-district special time slot format information then is set for starting if the sub-district allows to adopt the special time slot form to launch.
4, method as claimed in claim 3, it is characterized in that, also comprise according to described sub-district special time slot format information and determine whether terminal adopts the special time slot form, when described sub-district special time slot format information is the last time slot of up-downgoing switching point for the transmission time slot that starts and described terminal is assigned with, determine that described terminal is to use the special time slot form to carry out up emission.
5, the method for claim 1 is characterized in that, formation one protection is as the criterion the quantity of described last at least one transmission symbol that does not send at interval between the forward and backward time slot of a up-downgoing switching point to satisfy.
6, the method for claim 1 is characterized in that, the step that sends described signaling by broadcast channel comprises that whole terminals send described signaling in the sub-district.
7, a kind of system that avoids signal to send and receive interference comprises:
The base station makes up one and contains the information unit of sub-district up-downgoing switching point information, and comprises the signaling of described information unit to the terminal transmission by broadcast channel;
At least one terminal, receive described signaling from described broadcast channel, whether according to the transmission time slot that is assigned with is last time slot by the up-downgoing switching point of described sub-district up-downgoing switching point information indication, determine whether to use the special time slot form to carry out up emission, wherein said special time slot form make described terminal last at least one transmission symbol of subframe of up emission be not sent out.
8, system as claimed in claim 7 is characterized in that, when the transmission time slot that is assigned with when terminal was the last time slot of up-downgoing switching point, described terminal determined to use the special time slot form to carry out up emission.
9, system as claimed in claim 7, it is characterized in that, described information unit also comprises sub-district special time slot format information, if wherein the sub-district does not allow to adopt the special time slot form to launch, then described base station is provided with described sub-district special time slot format information for closing, if the sub-district allows to adopt the special time slot form to launch, then described base station is provided with described sub-district special time slot format information for starting.
10, system as claimed in claim 9, it is characterized in that, described terminal also determines whether to adopt the special time slot form according to described sub-district special time slot format information, when described sub-district special time slot format information was the last time slot of up-downgoing switching point for the transmission time slot that starts and described terminal is assigned with, described terminal determined to use the special time slot form to carry out up emission.
11, system as claimed in claim 7 is characterized in that, formation one protection is as the criterion the quantity of described last at least one transmission symbol that does not send at interval between the forward and backward time slot of a up-downgoing switching point to satisfy.
12, system as claimed in claim 7 is characterized in that, described base station sends described signaling by broadcast channel whole terminals in the sub-district.
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