CN101001233A - Method and equipment for transmitting downlink synchronous channel - Google Patents
Method and equipment for transmitting downlink synchronous channel Download PDFInfo
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Abstract
A method for transmitting downlink synchronous channels in a long CP sub-frame includes: a base station transmits a primary synchronous channel P-SCH and a sub-synchronous channel S-SCH in the long CP sub-frame, a user device receives them used in searching in local areas and channel estimation, in this way, synchronous channels can be used in public pilot apart from search in local areas, and sending P-SCH and S-SCH in long sub-frames can increase performance of synchronization.
Description
Technical field
The present invention relates to mobile radio communications system, particularly relate to a kind of equipment and method that in comprising long CP subframe, sends descending synchronous signal channel among the 3GPP LTE.
Background technology
At present, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE).In the middle of numerous physical layer transmission technology, OFDM (OFDM) technology is with its higher availability of frequency spectrum, and lower processing complexity becomes in all descending schemes more promising a kind of.
Be a kind of multi-carrier modulation communication technology on the OFDM technological essence, its basic principle is the data flow of a two-forty to be decomposed into several rate data streams transmit simultaneously on one group of mutually orthogonal subcarrier.The OFDM technology is because its multicarrier character has performance advantage aspect a lot.(1) significant advantage of OFDM technology is because data parallel transmission on a plurality of subcarriers respectively, and the length of the symbol on each subcarrier increases accordingly, and is insensitive to channel delay; Add protection on each symbol at interval by further giving, promptly introduce Cyclic Prefix (CP, Cyclic Prefix), under the situation of channel delay, can eliminate intersymbol interference (ISI) fully less than circulating prefix-length.Like this, each subcarrier has all experienced flat fading channel.(2) availability of frequency spectrum height of OFDM technology, ofdm signal are actual on frequency domain an overlapping, and this overlapping on improved the availability of frequency spectrum to a great extent.(3) ability of the anti-narrow band interference of OFDM technology and frequency selective fading is stronger.Can make OFDM have frequency diversity and time diversity effect by chnnel coding with interweaving, thereby resist narrow band interference and frequency selective fading effectively.(4) modulation of OFDM technology can realize by baseband I FFT conversion, and IFFT/FFT has ripe quick calculation method, can realize in dsp chip and hardware configuration easily.
Broadcast/multi broadcast is a kind of technology that transmits data message from a data source to a plurality of targets.In traditional mobile network, cell broadcaste service allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, belongs to information series business.Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, fast development along with Internet, a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration, delay sensitive.In order to support new demand, effectively utilize mobile network resource, existing 3GPP normative standard broadcast/multi broadcast business, in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.
According to existing discussion result about LTE, as shown in Figure 1, the Radio Resource in the LTE system is structure (101-103) with the frame, and frame length is identical with WCDMA, is 10ms; Each radio frames is subdivided into a plurality of subframes (104-107) (present result is that every frame comprises 20 subframes, and frame length is 0.5ms); Each subframe comprises a plurality of OFDM symbols according to the difference of loaded service etc., and short CP subframe comprises 7 symbols (108), and long CP subframe comprises 6 symbols (109).Long CP subframe is used for many Cell Broadcast CB/multicasts and the very large situation of radius of society.In the LTE system, the length of Cyclic Prefix (Cyclic prefix is called for short CP) has disposed two kinds, and is a kind of longer, a kind of shorter.According to the length difference of these two kinds of CP, we are long CP subframe with the subframe definition at above-mentioned long Cyclic Prefix place, and the subframe definition at relatively shorter Cyclic Prefix place is short CP subframe.The Cyclic Prefix that design is long its objective is in order to transmit many cell broadcaste services and to be used for the bigger sub-district of radius.The short-and-medium CP length of LTE system is approximately 4.8 μ s, the about 16.7 μ s of long CP length.According to the variation of the traffic carrying capacity of unicast service in the system and many Cell Broadcast CB/multicast services, network can be real-time or half dynamic number and the position distribution of adjusting short-and-medium CP subframe of a frame and long CP subframe.As shown in Figure 2, in the frame, the transfer point of long CP subframe and short CP subframe can have one, also can have a plurality of.If be designed to have only a transfer point, to do channel estimating fairly simple for interpolation between pilot tone.
In existing LTE standard was discussed, basic down public guide frequency structure as shown in Figure 3.First pilot tone is positioned at first or second OFDM symbol of a subframe.Additional pilots is also referred to as second pilot tone, can be positioned at the another one OFDM symbol of this subframe.First pilot tone and second pilot tone can change in each subframe of the position of frequency domain.Each subframe of first pilot tone all will be transmitted, and second pilot tone to be each subframe all transmit, still optionally transmission is undetermined at present.The effect of pilot tone provides enough Given informations and is used for receiving terminal and carries out channel estimating.Receiving terminal utilizes the algorithm of various channel estimating according to the frequency pilot sign that receives and the frequency pilot sign of transmission, can draw the channel coefficients of whole time-frequency lattice, thereby demodulate the bit information of transmission.The method of channel estimating has multiple, and for example: interpolation method comprises time domain interpolation and frequency domain interpolation; Two dimensional channel is estimated, is estimated as 2-D Weiner.In pilot configuration as shown in Figure 3, if first pilot tone and second pilot tone all send, can utilize the frequency pilot sign in the subframe to carry out channel estimating, also can utilize the pilot tone between different subframes to carry out channel estimating.If only send first pilot tone, be necessary to utilize the pilot tone between different subframes to carry out channel estimating, because at this moment have only a frequency pilot sign in a subframe, if do not utilize the frequency pilot sign of adjacent sub-frame, the channel coefficients of time-frequency lattice at frequency pilot sign place that can only utilize this subframe so is as the channel coefficients of whole time-frequency lattice, and this will cause the decline of channel estimating performance.
Identical with the WCDMA system, the base station sends synchronizing channel (SCH) in the LTE system, is used for subscriber equipment and carries out Cell searching.Synchronous channel SCH comprises primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH.Network side, the master sync signal that each sub-district sends all is identical, and the auxiliary synchronous signals that each sub-district sends is different.User equipment searches is behind P-SCH, can determine symbol timing and frame regularly, and then search S-SCH, just can determine the descending scrambler group that use the sub-district, thereby find the initial timing of BCH, according to using main scrambler and BCH channel in the known main scrambler group to make the main scrambler that correlation ratio result identifies use, pass through scramble process at last then, can demodulate the broadcast message among the BCH.
In the discussion of existing LTE, the base station is to send P-SCH and S-SCH in the subframe of short CP.As shown in Figure 4: S-SCH sends in short CP subframe.The major function of S-SCH is to be used for subscriber equipment to identify the scrambler group that use the sub-district in cell search process, but consider the characteristic of S-SCH, also can be used as the public guide frequency of the short CP subframe in place, the advantage of doing like this is to need not the extra pilots expense just can realize channel coefficients interpolation in the subframe, thereby improves performance for estimating channel.And P-SCH sends in short subframe, and can only be used for subscriber equipment carries out Cell searching, can not can not be used as the public guide frequency of next long CP subframe as the public guide frequency of this subframe.
In the prior art, the base station is to send P-SCH and S-SCH in short CP subframe.Each sub-district sends identical P-SCH, sends different S-SCH.And the characteristics of many Cell Broadcast CB/multicast services are the identical data messages of each sub-district transmission, and the characteristics of unicast service are that each user of each sub-district sends different information.So, characteristics according to P-SCH and S-SCH, and the characteristics of many Cell Broadcast CB/multicast services and unicast service, P-SCH and S-SCH carry out the Cell searching except being mainly used in subscriber equipment, can also be used to do public guide frequency, wherein, P-SCH is suitable as the pilot tone of the long CP subframe in place, because the P-SCH that each sub-district sends is identical, and the many Cell Broadcast CB/multicast services that send in the long CP subframe are also identical in each sub-district, so the channel situation of the experience of the data in P-SCH and the long CP subframe is identical, can be with the pilot tone of P-SCH as long CP subframe.And S-SCH is suitable as the pilot tone of short CP subframe, because each sub-district sends specific S-SCH, and the unicast service that sends in the short CP subframe is also different in each sub-district, so S-SCH is identical with the channel situation of data experience in short CP subframe, and can be with the pilot tone of S-SCH as weak point CP subframe.And it is opposite, P-SCH is not suitable for use in the pilot tone of short CP subframe, and S-SCH also is not suitable for use in the pilot tone of the subframe of long CP, because the data of unicast service are different with the disturbed condition that P-SCH is subjected to, and the data of many Cell Broadcast CB/multicast services are also different with the disturbed condition that S-SCH is subjected to.
Therefore, prior art does not make full use of the characteristics of P-SCH and S-SCH, and the characteristics of many Cell Broadcast CB/multicast services and unicast service design.The present invention proposes improvement scheme at prior art, P-SCH is sent in long CP subframe, thereby can utilize the pilot tone of P-SCH as long CP subframe, in addition, bring in from the user, the P-SCH from different districts that the user receives has certain deviation in time, CP length is long more, transmission P-SCH can restrain oneself the time delay expansion of this temporal skew and signal more, so can improve net synchronization capability, the Cell searching when helping initial synchronisation in long CP subframe.
Summary of the invention
The transmission method and the equipment that the purpose of this invention is to provide synchronizing channel in a kind of ofdm system, thus net synchronization capability improved, optimize the design of physical layer.
According to an aspect of of the present present invention, a kind of method of transmitting downlink synchronous channel comprises step:
A) base station sends primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH in long CP subframe;
B) subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
According to another aspect of the present invention, a kind of method of transmitting downlink synchronous channel comprises step:
A) base station sends primary synchronization channel P-SCH in long CP subframe, sends auxiliary synchronization channel S-SCH in short CP subframe;
B) subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
According to another aspect of the present invention, a kind of base station transmitting apparatus of transmitting downlink synchronous channel comprises:
Be mapped to the primary synchronization channel P-SCH of long CP subframe, be used for primary synchronization channel P-SCH is mapped to long CP subframe;
Be mapped to the auxiliary synchronization channel S-SCH of long CP subframe, be used for auxiliary synchronization channel S-SCH is mapped to long CP subframe;
The physical channel multiplexer, the primary synchronization channel P-SCH that is used for being mapped to long CP subframe carries out multiplexing with the auxiliary synchronization channel S-SCH that is mapped to long CP subframe;
Emitter is used for the physical channel after multiplexing is sent.
According to another aspect of the present invention, a kind of user receiving equipment that receives descending synchronous signal channel comprises:
Receiving system is used for the radiofrequency signal that the base station sends is received;
The physical channel demodulation multiplexer is used for the primary synchronization channel P-SCH and the auxiliary synchronization channel S-SCH of long CP subframe are carried out demultiplexing, exports the auxiliary synchronization channel S-SCH in primary synchronization channel P-SCH in the long CP subframe and the long CP subframe.
According to another aspect of the present invention, a kind of base station transmitting apparatus of transmitting downlink synchronous channel comprises:
Be mapped to the primary synchronization channel P-SCH of long CP subframe, be used for primary synchronization channel P-SCH is mapped to long CP subframe;
Be mapped to the auxiliary synchronization channel S-SCH of short CP subframe, be used for auxiliary synchronization channel S-SCH is mapped to short CP subframe;
The physical channel multiplexer, the primary synchronization channel P-SCH that is used for being mapped to long CP subframe carries out multiplexing with the auxiliary synchronization channel S-SCH that is mapped to short CP subframe;
Emitter is used for the physical channel after multiplexing is sent.
According to another aspect of the present invention, a kind of user receiving equipment that receives descending synchronous signal channel comprises:
Receiving system is used for the radiofrequency signal that the base station sends is received;
The physical channel demodulation multiplexer is used for the primary synchronization channel P-SCH of long CP subframe and the auxiliary synchronization channel S-SCH that lacks in the CP subframe are carried out demultiplexing, exports primary synchronization channel P-SCH and the auxiliary synchronization channel S-SCH that lacks in the CP subframe in the long CP subframe.
The invention enables synchronizing channel (P-SCH and S-SCH) except being used for Cell searching, also can be used for public guide frequency, the shortcoming that the characteristics of the characteristics that do not make full use of P-SCH and S-SCH in the prior art and many Cell Broadcast CB/multicast services and unicast service of having overcome design.Thereby save the expense of pilot resources, improve the utilance of pilot resources.Transmission P-SCH and S-SCH can improve synchronization performance in long CP subframe, because bring in from the user, the P-SCH from different districts that the user receives has certain deviation in time, CP length is long more, can restrain oneself the time delay expansion of this temporal skew and signal more, thus the Cell searching when helping initial synchronisation.
Description of drawings
Fig. 1 is the frame structure of LTE system;
Fig. 2 is the multiplexing of many Cell Broadcast CB/multicast services and unicast service;
Fig. 3 is basic downward pilot frequency structure figure (comprising 7 OFDM symbols in subframe of supposition among the figure);
Fig. 4 is the delivery plan of synchronizing channel in the prior art;
Fig. 5 is the inventive method one schematic diagram;
Fig. 6 is the inventive method two schematic diagrames;
Fig. 7 is the synchronizing channel delivery plan among the embodiment one;
Fig. 8 is the synchronizing channel delivery plan among the embodiment two;
Fig. 9 is the synchronizing channel delivery plan among the embodiment three;
Figure 10 is the synchronizing channel delivery plan among the embodiment four;
Figure 11 is the base station transmitting apparatus one of transmitting downlink synchronous channel;
Figure 12 is the user receiving equipment one that receives descending synchronous signal channel;
Figure 13 is the base station transmitting apparatus two of transmitting downlink synchronous channel;
Figure 14 is the user receiving equipment two that receives descending synchronous signal channel;
Embodiment
In the LTE system, base station transmission synchronizing channel P-SCH and S-SCH are used for subscriber equipment and do Cell searching.According to the characteristics of P-SCH and S-SCH, and the characteristics of many Cell Broadcast CB/multicast services and unicast service, P-SCH is configured in the long CP subframe transmits, at this moment P-SCH also can be as the public guide frequency of the long CP subframe in place except being used for Cell searching.And S-SCH both can transmit in long CP subframe, also can transmit in short CP subframe.So the transmission of synchronizing channel has two kinds of methods.
Method one: as shown in Figure 5, comprise step:
A) 501: the base station sends primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH in long CP subframe;
B) 502: subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
In long CP subframe, P-SCH and S-SCH can time division multiplexing, code division multiplexing and frequency division multiplexings.Subscriber equipment can utilize P-SCH that the base station the sends pilot tone as this subframe in long CP subframe, thereby this subframe down channel coefficient is estimated; And subscriber equipment can utilize S-SCH that the base station the sends pilot tone as previous short CP subframe in the subframe of long CP, thereby previous short CP subframe down channel coefficient is estimated.
Method two: as shown in Figure 6, comprise step:
A) 601: the base station sends primary synchronization channel P-SCH in long CP subframe, sends auxiliary synchronization channel S-SCH in short CP subframe;
B) 602: subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
In method two, P-SCH and S-SCH adopt time division multiplexing.Subscriber equipment can utilize P-SCH that the base station the sends pilot tone as this subframe in long CP subframe, thereby this subframe down channel coefficient is estimated; And the S-SCH that subscriber equipment can utilize the base station to send in the subframe of lacking CP lacks the pilot tone of CP subframe as the place, thereby place short CP subframe down channel coefficient is estimated.
Among the present invention, the switching point in the frame between eldest son's frame and short subframe can have only one, also can have a plurality of.If but switching point is set to one, the channel coefficients of each OFDM data symbol can obtain by channel estimating between pilot tone in the unicast service so, because S-SCH can be as the pilot tone of last short subframe.
Among the present invention, the position of P-SCH in long CP subframe can be first symbol, can be last symbol, also can be other symbols.
This in long CP subframe the advantage of transfer synchronous channel be to save the pilot resources expense, improve the pilot resources utilance, improve the synchronizing channel performance, optimize physical layer design.
Synchronization channel transmissions method among the present invention is applicable to the various method for synchronous in the ofdm system.
Synchronization channel transmissions method among the present invention is applicable to the various channel estimation methods that adopt in the ofdm system, and purpose is to provide abundant pilot frequency information for channel estimation method.
The present invention is not limited in long CP subframe and sends synchronizing channel, and the BCH broadcast channel that uses in the cell search process also can transmit in long CP subframe, and subscriber equipment receives BCH broadcast channel read-out system information.In long CP subframe, transmit the BCH channel, can improve the performance of BCH channel,, can stand the time delay expansion more because CP length is long more.Notice that the BCH broadcast channel can not be used as pilot tone, because they are not known arrays.
The present invention proposes the base station transmitting apparatus of two kinds of transmitting downlink synchronous channels.
Base station transmitting apparatus one: as shown in figure 11.Comprise:
1101 are mapped to the primary synchronization channel P-SCH of long CP subframe, are used for primary synchronization channel P-SCH is mapped to long CP subframe;
1102 are mapped to the auxiliary synchronization channel S-SCH of long CP subframe, are used for auxiliary synchronization channel S-SCH is mapped to long CP subframe;
1103 physical channel multiplexers, the auxiliary synchronization channel S-SCH that is used for the 1101 primary synchronization channel P-SCH and 1102 that are mapped to long CP subframe are mapped to long CP subframe carries out multiplexing;
1104 emitters are used for the physical channel after multiplexing is sent.
Wherein, 1101 are mapped to the primary synchronization channel of long CP subframe, are primary synchronization channel to be mapped in the long CP subframe transmit; 1102 are mapped to the auxiliary synchronization channel of long CP subframe, are auxiliary synchronization channel to be mapped in the long CP subframe transmit; 1103 physical channel multiplexers are the auxiliary synchronization channel that 1101 primary synchronization channels and 1102 that are mapped to long CP subframe are mapped to long CP subframe to be carried out multiplexing, and multiplex mode can comprise time division multiplexing, frequency division multiplexing, or code division multiplexing; 1104 emitters are that the physical channel after multiplexing is sent, and can comprise digital-to-analogue conversion and radio frequency part.
Base station transmitting apparatus two: as shown in figure 13.Comprise:
1301 are mapped to the primary synchronization channel P-SCH of long CP subframe, are used for primary synchronization channel P-SCH is mapped to long CP subframe;
1302 are mapped to the auxiliary synchronization channel S-SCH of short CP subframe, are used for auxiliary synchronization channel S-SCH is mapped to short CP subframe;
1303 physical channel multiplexers, the auxiliary synchronization channel S-SCH that is used for the 1301 primary synchronization channel P-SCH and 1302 that are mapped to long CP subframe are mapped to short CP subframe carries out multiplexing;
1304 emitters are used for the physical channel after multiplexing is sent.
Wherein, 1301 are mapped to the primary synchronization channel of long CP subframe, are primary synchronization channel to be mapped in the long CP subframe transmit; 1302 are mapped to the auxiliary synchronization channel of short CP subframe, are auxiliary synchronization channel to be mapped in the short CP subframe transmit; 1303 physical channel multiplexers are to carry out the auxiliary synchronization channel that 1301 primary synchronization channels and 1302 that are mapped to long CP subframe are mapped to short CP subframe multiplexing; 1304 emitters are that the physical channel after multiplexing is sent, and can comprise digital-to-analogue conversion and radio frequency part.
Corresponding to the base station transmitting apparatus of transmitting downlink synchronous channel of the present invention, the present invention proposes two kinds of user receiving equipments that receive descending synchronous signal channel.
User receiving equipment one: corresponding to base station transmitting apparatus one.As shown in figure 12.Comprise:
1201 receiving systems are used for the radiofrequency signal that the base station sends is received;
1202 physical channel demodulation multiplexers are used for the primary synchronization channel P-SCH and the auxiliary synchronization channel S-SCH of long CP subframe are carried out demultiplexing, primary synchronization channel P-SCH in the output 1203 long CP subframes and the auxiliary synchronization channel S-SCH in the 1204 long CP subframes.
Wherein, 1201 receiving systems are that the radiofrequency signal that the base station sends is received, and can comprise that radio frequency receives and analog-to-digital conversion; 1202 physical channel demodulation multiplexers are that primary synchronization channel in the long CP subframe and auxiliary synchronization channel are carried out demultiplexing, primary synchronization channel in the output 1203 long CP subframes and the auxiliary synchronization channel in the 1204 long CP subframes.
User receiving equipment two: corresponding to base station transmitting apparatus two.As shown in figure 14.Comprise:
1401 receiving systems are used for the radiofrequency signal that the base station sends is received;
1402 physical channel demodulation multiplexers, be used for the primary synchronization channel P-SCH of long CP subframe and the auxiliary synchronization channel S-SCH in the short CP subframe are carried out demultiplexing the auxiliary synchronization channel S-SCH in primary synchronization channel P-SCH in the output 1403 long CP subframes and the 1404 short CP subframes.
Wherein, 1401 receiving systems are that the radiofrequency signal that the base station sends is received, and can comprise that radio frequency receives and analog-to-digital conversion; 1402 physical channel demodulation multiplexers are that the auxiliary synchronization channel in primary synchronization channel in the long CP subframe and the short CP subframe is carried out demultiplexing, the auxiliary synchronization channel in primary synchronization channel in the output 1403 long CP subframes and the 1404 short CP subframes.
Embodiment
Too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
Embodiment one:
In embodiment one, suppose that the transfer point of the short-and-medium CP subframe of a frame and long CP subframe has only one, short CP subframe is preceding, long CP subframe after, first symbol transmission in subframe of first pilot tone or not second pilot tone, P-SCH and S-SCH time division multiplexing.As shown in Figure 7.
The base station sends P-SCH at first OFDM symbol of first long CP subframe, can not send first pilot tone in this subframe, and replace first pilot tone with P-SCH.This is because P-SCH possesses the condition of doing long CP subframe pilot tone: 1) send identical P-SCH, 2 in each sub-district) P-SCH is known array.Base station in the end last OFDM symbol of a short CP subframe sends S-SCH.
Subscriber equipment receives P-SCH, is used for Cell searching and channel estimating.
Channel estimating for first long CP subframe, subscriber equipment can utilize first pilot tone of P-SCH and next long CP subframe to estimate the channel coefficients of their place time-frequency lattice, obtain the channel coefficients of the whole time-frequency lattice of first long CP subframe then with interpolation method, and then carry out the demodulation of data.For other long CP subframes, subscriber equipment can utilize first pilot tone of different long CP subframes to carry out the channel coefficients that interpolation between subframe obtains whole time-frequency lattice.
Subscriber equipment receives S-SCH, is used for Cell searching and channel estimating.
For last short CP subframe, subscriber equipment can utilize its first pilot tone and S-SCH to estimate the channel coefficients of their place time-frequency lattice, obtains the channel coefficients of the whole time-frequency lattice of this weak point CP subframe then with interpolation method.For other short CP subframes, the channel coefficients of whole time-frequency lattice can utilize first pilot tone of different short CP subframes to carry out that interpolation obtains between subframe.
Our the above-mentioned part in embodiment one has been described the estimation of channel coefficients in the frame, boundary subframe for adjacent two frames, last subframe of former frame is long CP subframe, first subframe of back one frame is short CP subframe, in order to obtain the channel coefficients of the whole time-frequency lattice of this long CP subframe by pilot tone value of interleaving in the long CP subframe, last symbol is also wanted pilot symbol transmitted in this long CP subframe.
Embodiment two:
In embodiment two, suppose that the transfer point of short-and-medium CP subframe of a frame and long CP subframe has only one, short CP subframe is preceding, long CP subframe after, first pilot tone first symbol in subframe sends, and does not send second pilot tone, P-SCH and S-SCH frequency division multiplexing or code division multiplexing.As shown in Figure 8.
The base station sends P-SCH and S-SCH at first OFDM symbol of first long CP subframe, can not send first pilot tone in this subframe, and replace first pilot tone with P-SCH.This is because P-SCH possesses the condition of doing long CP subframe pilot tone: 1) send identical P-SCH, 2 in each sub-district) P-SCH is known array.
Subscriber equipment receives P-SCH, is used for Cell searching and channel estimating.
Channel estimating for first long CP subframe, subscriber equipment can utilize first pilot tone of P-SCH and next long CP subframe to estimate the channel coefficients of their place time-frequency lattice, obtain the channel coefficients of the whole time-frequency lattice of first long CP subframe then with interpolation method, and then carry out the demodulation of data.For other long CP subframes, subscriber equipment can utilize first pilot tone of different long CP subframes to carry out the channel coefficients that interpolation between subframe obtains whole time-frequency lattice.
Subscriber equipment receives S-SCH, is used for Cell searching and channel estimating.
For last short CP subframe, subscriber equipment can utilize the channel coefficients of the S-SCH estimation place time-frequency lattice in its first pilot tone and the next long CP subframe, obtains the channel coefficients of the whole time-frequency lattice of last short CP subframe then with interpolation method.For other short CP subframes, the channel coefficients of whole time-frequency lattice can utilize first pilot tone of different short CP subframes to carry out that interpolation obtains between subframe.
Our the above-mentioned part in embodiment two has been described the estimation of channel coefficients in the frame, boundary subframe for adjacent two frames, last subframe of former frame is long CP subframe, first subframe of back one frame is short CP subframe, in order to obtain the channel coefficients of the whole time-frequency lattice of this long CP subframe by pilot tone value of interleaving in the long CP subframe, last symbol is also wanted pilot symbol transmitted in this long CP subframe.
Embodiment three:
In embodiment three, to suppose and have only a long CP subframe in the frame, the transfer point of short CP subframe and long CP subframe has two, and first pilot tone first symbol in subframe sends, and does not send second pilot tone, P-SCH and S-SCH time division multiplexing.As shown in Figure 9.
The base station sends S-SCH at first OFDM symbol of long CP subframe, send P-SCH at second OFDM symbol, in order to obtain the channel coefficients of the whole time-frequency lattice of this long CP subframe, last symbol pilot symbol transmitted in this subframe by pilot tone value of interleaving in the long CP subframe.
Subscriber equipment receives P-SCH, is used for Cell searching and channel estimating.
Channel estimating for long CP subframe, the channel coefficients that subscriber equipment can utilize P-SCH in the long CP subframe and frequency pilot sign to estimate their place time-frequency lattice, obtain the channel coefficients of the whole time-frequency lattice of long CP subframe then with interpolation method, and then carry out the demodulation of data.
Subscriber equipment receives S-SCH, is used for Cell searching and channel estimating.
For the short CP subframe of long CP subframe front, subscriber equipment can utilize the S-SCH in its first pilot tone and the next long CP subframe to estimate the channel coefficients of their place time-frequency lattice, obtains the channel coefficients of the whole time-frequency lattice of this weak point CP subframe then with interpolation method.For other short CP subframes, the channel coefficients of whole time-frequency lattice can utilize first pilot tone of different short CP subframes to carry out that interpolation obtains between subframe.
Embodiment four:
In embodiment four, suppose that the transfer point of short-and-medium CP subframe of a frame and long CP subframe has only one, short CP subframe is preceding, long CP subframe after, first pilot tone first symbol in subframe sends, and does not send second pilot tone, P-SCH and S-SCH frequency division multiplexing or code division multiplexing.As shown in figure 10.
The base station sends P-SCH and S-SCH at second OFDM symbol of first long CP subframe, can not send first pilot tone in this subframe, and replace first pilot tone with P-SCH.This is because P-SCH possesses the condition of doing long CP subframe pilot tone: 1) send identical P-SCH, 2 in each sub-district) P-SCH is known array.
Subscriber equipment receives P-SCH, is used for Cell searching and channel estimating.
Channel estimating for first long CP subframe, subscriber equipment can utilize first pilot tone of P-SCH and next long CP subframe to estimate the channel coefficients of their place time-frequency lattice, obtain the channel coefficients of the whole time-frequency lattice of first long CP subframe then with interpolation method, adopt extrapolation for first symbol, other symbols adopt interpolation method, carry out the demodulation of data then.For other long CP subframes, subscriber equipment can utilize first pilot tone of different long CP subframes to carry out the channel coefficients that interpolation between subframe obtains whole time-frequency lattice.
Subscriber equipment receives S-SCH, is used for Cell searching and channel estimating.
For last short CP subframe, subscriber equipment can utilize the channel coefficients of the S-SCH estimation place time-frequency lattice in its first pilot tone and the next long CP subframe, obtains the channel coefficients of the whole time-frequency lattice of last short CP subframe then with interpolation method.For other short CP subframes, the channel coefficients of whole time-frequency lattice can utilize first pilot tone of different short CP subframes to carry out that interpolation obtains between subframe.
Our the above-mentioned part in embodiment four has been described the estimation of channel coefficients in the frame, boundary subframe for adjacent two frames, last subframe of former frame is long CP subframe, first subframe of back one frame is short CP subframe, in order to obtain the channel coefficients of the whole time-frequency lattice of this long CP subframe by pilot tone value of interleaving in the long CP subframe, last symbol is also wanted pilot symbol transmitted in this long CP subframe.
Among four embodiment, the algorithm of channel estimating is example with the interpolation method in the above, and certainly with advanced channel estimation method, for example two dimensional channel estimates that 2-D Weiner algorithm also can realize.
Claims (22)
1. the method for a transmitting downlink synchronous channel in long CP subframe comprises step:
A) base station sends primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH in long CP subframe;
B) subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
2. method according to claim 1 is characterized in that the P-SCH that described subscriber equipment utilizes the base station to send does Cell searching in long CP subframe.
3. method according to claim 1 is characterized in that described subscriber equipment utilizes P-SCH that the base station the sends pilot tone as this subframe in long CP subframe, thereby the down channel coefficient is estimated.
4. method according to claim 1 is characterized in that described subscriber equipment utilizes S-SCH that the base station the sends pilot tone as previous short CP subframe in long CP subframe, thereby the down channel coefficient is estimated.
5. method according to claim 1 is characterized in that described P-SCH and S-SCH can be frequency division multiplexings.
6. method according to claim 1 is characterized in that described P-SCH and S-SCH can be code division multiplexings.
7. method according to claim 1 is characterized in that described P-SCH and S-SCH can be time division multiplexinges.
8. method according to claim 1 is characterized in that if the subframe of a plurality of long CP is arranged, and the base station comprises at first and sends primary synchronization channel P-SCH in the subframe of long CP.
9. method according to claim 1 is characterized in that the switching point between described eldest son's frame and the short subframe is at least one.
10. the method for a transmitting downlink synchronous channel in long CP subframe comprises step:
A) base station sends primary synchronization channel P-SCH in long CP subframe, sends auxiliary synchronization channel S-SCH in short CP subframe;
B) subscriber equipment receives primary synchronization channel P-SCH and auxiliary synchronization channel S-SCH, is used for Cell searching and channel estimating.
11. method according to claim 10 is characterized in that the P-SCH that described subscriber equipment utilizes the base station to send does Cell searching in long CP subframe.
12. method according to claim 10 is characterized in that described subscriber equipment utilizes P-SCH that the base station the sends pilot tone as this subframe in the subframe of long CP, thereby the down channel characteristic is estimated.
13. method according to claim 10 is characterized in that described subscriber equipment utilizes S-SCH that the base station the sends pilot tone as this subframe in the subframe of short CP, thereby the down channel coefficient is estimated.
14. method according to claim 10 is characterized in that if the subframe of a plurality of long CP is arranged, the base station comprises at first and sends primary synchronization channel P-SCH in the subframe of long CP.
15. method according to claim 10 is characterized in that the switching point between described eldest son's frame and the short subframe is at least one.
16. the base station transmitting apparatus of a transmitting downlink synchronous channel comprises: be mapped to the primary synchronization channel P-SCH of long CP subframe, be used for primary synchronization channel P-SCH is mapped to long CP subframe;
Be mapped to the auxiliary synchronization channel S-SCH of long CP subframe, be used for auxiliary synchronization channel S-SCH is mapped to long CP subframe;
The physical channel multiplexer, the primary synchronization channel P-SCH that is used for being mapped to long CP subframe carries out multiplexing with the auxiliary synchronization channel S-SCH that is mapped to long CP subframe;
Emitter is used for the physical channel after multiplexing is sent.
17. base station according to claim 16 transmitting apparatus, it is characterized in that described physical channel multiplexing can be time division multiplexing.
18. base station according to claim 16 transmitting apparatus, it is characterized in that described physical channel multiplexing can be frequency division multiplexing.
19. base station according to claim 16 transmitting apparatus, it is characterized in that described physical channel multiplexing can be code division multiplexing.
20. a subscriber equipment receiving equipment that receives descending synchronous signal channel comprises:
Receiving system is used for the radiofrequency signal that the base station sends is received;
The physical channel demodulation multiplexer is used for the primary synchronization channel P-SCH and the auxiliary synchronization channel S-SCH of long CP subframe are carried out demultiplexing, exports the auxiliary synchronization channel S-SCH in primary synchronization channel P-SCH in the long CP subframe and the long CP subframe.
21. the base station transmitting apparatus of a transmitting downlink synchronous channel comprises:
Be mapped to the primary synchronization channel P-SCH of long CP subframe, be used for primary synchronization channel P-SCH is mapped to long CP subframe;
Be mapped to the auxiliary synchronization channel S-SCH of short CP subframe, be used for auxiliary synchronization channel S-SCH is mapped to short CP subframe;
The physical channel multiplexer, the primary synchronization channel P-SCH that is used for being mapped to long CP subframe carries out multiplexing with the auxiliary synchronization channel S-SCH that is mapped to short CP subframe;
Emitter is used for the physical channel after multiplexing is sent.
22. a subscriber equipment receiving equipment that receives descending synchronous signal channel comprises: receiving system is used for the radiofrequency signal that the base station sends is received;
The physical channel demodulation multiplexer is used for the primary synchronization channel P-SCH of long CP subframe and the auxiliary synchronization channel S-SCH that lacks in the CP subframe are carried out demultiplexing, exports primary synchronization channel P-SCH and the auxiliary synchronization channel S-SCH that lacks in the CP subframe in the long CP subframe.
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| CN 200610006540 CN101001233A (en) | 2006-01-12 | 2006-01-12 | Method and equipment for transmitting downlink synchronous channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610006540 CN101001233A (en) | 2006-01-12 | 2006-01-12 | Method and equipment for transmitting downlink synchronous channel |
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