CN101094511B - Method and device for sending access prefix in random access procedure - Google Patents
Method and device for sending access prefix in random access procedure Download PDFInfo
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- CN101094511B CN101094511B CN2006101151432A CN200610115143A CN101094511B CN 101094511 B CN101094511 B CN 101094511B CN 2006101151432 A CN2006101151432 A CN 2006101151432A CN 200610115143 A CN200610115143 A CN 200610115143A CN 101094511 B CN101094511 B CN 101094511B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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Abstract
The method comprises: in a cell, the access prefix type with different time-domain length is set up, and the corresponding relation between the said access prefix type and the distance from terminal to base station, or the random access channel quality value, or terminal moving speed is also set up; when the terminal detects the distance to the home cell base station, or the random access channelquality value, or mobile terminal moving speed, according to the access prefix type corresponding to the detected distance, or random access channel quality, or mobile moving speed, and based on the time-domain length of said access prefix type, the terminal sends the message to the base station.
Description
Technical field
The present invention relates to the access technology of terminal in wireless communication system, particularly a kind of method and device that in random access procedure, sends Access Preamble.
Background technology
Wireless communication system all needs to provide communication service for the terminal of some, and these terminals are dispersed in the different base station coverage of wireless communication system.When terminal will communicate, at first need to initiate random access procedure to affiliated base station, therefore, access technology all occupies an important position in various types of wireless communication systems at random.
In random access procedure, at first need terminal to send Access Preamble to affiliated base station by Random Access Channel, be used to ask to realize and the uplink synchronous of affiliated base station, can comprise the signature sequence of representing random identification (ID) and other information etc.; After the timing information that sends according to affiliated base station of terminal carries out uplink synchronous with affiliated base station then, send the access request message again, this message is used to ask to set up the Traffic Channel link between terminal and the affiliated base station.
Access Preamble is called access probe again.
Being provided with of Access Preamble needs the consideration base station to catch the complexity of this Access Preamble.Except the signature sequence type that Access Preamble comprised, the complexity that the time length of field that Access Preamble takies is caught the base station also has certain influence.This is because in any unit interval, the emission maximum power that terminal is used to send Access Preamble is limited, has only by the accumulation on the time domain, could obtain the bigger detected energy that this Access Preamble is caught in the base station that is easy to.Therefore, take that the Access Preamble of length of field can obtain bigger detected energy when longer, help base station catching Access Preamble; Take the less detected energy of Access Preamble acquisition of length of field more in short-term, under the second-rate situation of Random Access Channel, the base station is difficult to catching of this Access Preamble.
On the other hand, the base station needs the long time when catching the Access Preamble that takies length of field when more, promptly only receive all running time-frequency resources relevant with Access Preamble after, just can finish and catch.For example, in OFDM (OFDM) system, certain Access Preamble has accounted for 3 physical frames, after the base station only receives these 3 physical frames, just calculates and finishes catching of this Access Preamble.Correspondingly, the base station needs the less time when catching the Access Preamble that takies length of field when less.Therefore,, advantage is arranged respectively, be fit to different access situations at random for the Access Preamble that takies different time domain length.
Fig. 1 is the structural representation of prior art Access Preamble, is provided with the Access Preamble of three kinds of different time domain length according to the size of sub-district, terminal place.
When the sub-district at the current place of terminal hour, less than 13 kilometers, use the Access Preamble of first row such as the radius of sub-district, this Access Preamble takies a subframe; When the sub-district at the current place of terminal is big, greater than 13 kilometers during, use the Access Preamble of secondary series such as the radius of sub-district less than 28 kilometers, take two subframes, the information that Access Preamble comprised has repeated once as signature sequence etc.; When the sub-district at the current place of terminal is big, during greater than 28 kilometers, use tertial Access Preamble such as the radius of sub-district, take three subframes, the information that Access Preamble comprised has repeated twice.After Random Access Channel sends Access Preamble, also be provided with guard time, this guard time also is to increase along with the increase of sub-district.
The benefit that adopts this mode that Access Preamble is set is: for little sub-district, short access period is at random arranged, the time length of field that Access Preamble takies is shorter.The sub-district that little sub-district is normally busier, the more terminal that distributed in these sub-districts, short access period at random and take short time length of field helps frequently inserting at random of a plurality of terminals, guarantees the efficient that terminal inserts at random in the sub-district.For big sub-district, the terminal that is positioned at cell edge is far away from the base station, and the Access Preamble that terminal sends has bigger path loss, and Access Preamble takies long time length of field can increase detected energy, help offsetting the influence of path loss, improve the ability that Access Preamble is caught in the base station.Big guard time also can make the base station tolerate bigger synchronous error when uplink synchronous is searched for, and the access at random of terminal that helps cell edge is synchronous.
But adopt this mode also to exist shortcoming: for bigger or big sub-district, Access Preamble takies the access at random from this cell base station terminal far away that long time length of field helps cell edge, but in this sub-district from the nearer terminal of this cell base station, then unnecessary, if adopt the Access Preamble take length of field when long, not only waste the running time-frequency resource in the sub-district, but also prolong the time of inserting at random, reduce the efficient that inserts at random.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that sends Access Preamble in random access procedure, this method can make in the big sub-district from the nearer terminal of this cell base station or the fast terminal of translational speed and not adopt the Access Preamble that takies length of field when long, thus the running time-frequency resource this sub-district that avoids waste in and prolong the time of access at random.
The present invention also provides a kind of emitter that sends Access Preamble in random access procedure, this device can make in the big sub-district from the nearer terminal of this cell base station or the fast terminal of translational speed and not adopt the Access Preamble that takies length of field when long, thus the running time-frequency resource this sub-district that avoids waste in and prolong the time of access at random.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of method that in random access procedure, sends Access Preamble, Access Preamble type with different time domain length is set in the sub-district, and the terminal to base station distance value is set or/and the Random Access Channel mass value or/and the corresponding relation between the Access Preamble type of moving velocity of terminal and different time domain length, this method also comprises:
A, terminal detect current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal;
B, terminal determine detected distance value according to the corresponding relation that is provided with or/and the Random Access Channel mass value sends after or/and the corresponding Access Preamble type of terminal current movement speed, sending to current affiliated subdistrict base station or oppositely insert the Access Preamble of target cell base station according to the time length of field setting of the type.
In orthogonal frequency division multiplex OFDM system, the described process that Access Preamble is sent of step B is:
Access Preamble is carrying transmission on the OFDM symbol continuously.
Described process with Access Preamble carrying transmission on continuous OFDM symbol is:
The signature sequence of Access Preamble is divided into a described continuous OFDM number of symbols subsequence, behind each subsequence process discrete Fourier transform (DFT) DFT, is mapped on the continuous subcarrier of OFDM symbol, after the OFDM modulation, go out by antenna transmission.
Comprise in the ofdm system of 8 OFDM symbols and when Access Preamble is divided into two types at each physical frame, the Access Preamble process that carrying sends on OFDM symbol continuously is:
Its short-and-medium Access Preamble is modulated at carrying transmission on 4 continuous OFDM symbols, and wherein Chang Access Preamble is modulated at carrying transmission on 8 continuous OFDM symbols.
Described signature sequence is Walsh sign indicating number sequence, GCL sequence or DFT sequence.
When described signature sequence is the Walsh sign indicating number, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
Be that Ns Walsh sign indicating number sequence in the Walsh sign indicating number of N1 is as the signature sequence of its short-and-medium Access Preamble with exponent number; With the exponent number on the child node of remaining N1-Ns N1 rank Walsh code tree is the signature sequence of the Walsh sign indicating number sequence of N2=2 * N1 as wherein long Access Preamble.
The exponent number N1 of described Walsh sign indicating number can be 512, and N2 is 1024.
The exponent number N1 of described Walsh sign indicating number is 512, and N2 is 1024 o'clock, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is:
Wherein the Walsh sign indicating number of Chang Access Preamble is:
The exponent number N1 of described Walsh sign indicating number is 512, and N2 is 1024 o'clock, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is:
Wherein the Walsh sign indicating number of Chang Access Preamble is:
The described Access Preamble that it is short-and-medium is modulated on 4 continuous OFDM symbols carrying and sends, and wherein Chang Access Preamble is modulated at the process of carrying transmission on 8 continuous OFDM symbols and is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is divided into 128 row, 4 row, and every row are mapped on 128 continuous subcarriers of OFDM symbol respectively through after 128 the DFT conversion, after the OFDM modulation, go out by antenna transmission; The Walsh sign indicating number of long Access Preamble is divided into 128 row, 8 row, and every row are mapped on 128 continuous subcarriers of OFDM symbol respectively through after 128 the DFT conversion, after the OFDM modulation, go out by antenna transmission.
The transmission of described its short-and-medium Access Preamble can be at random preceding 4 OFDM symbols of a physical frame of selection or back 4 OFDM symbols in send.
Before steps A, this method also comprises:
Terminal is according to current place cell base station or oppositely insert target cell base station and determine sub-district, current place or oppositely insert the Access Preamble type whether Target cell is provided with different time domain length by the Access Preamble type information that whether is provided with different time domain length that the downlink broadcast channel sends, if, execution in step A; Otherwise, send to the current area base station or oppositely insert target cell base station after the Access Preamble type that directly adopts sub-district, current place or oppositely insert the Target cell setting is provided with Access Preamble.
Described terminal current place cell base station or the process that oppositely inserts the Access Preamble type information that whether is provided with different time domain length that target cell base station sends by the downlink broadcast channel are:
Terminal current place cell base station or oppositely insert target cell base station determines whether to be provided with different time domain length in the sub-district according to the radius size of institute's coverage cell when setting up Access Preamble type, if then send the Access Preamble type information that is provided with different time domain length by the downlink broadcast channel; Otherwise, then the Access Preamble type information of different time domain length is not set or does not send information by the transmission of downlink broadcast channel.
Described Random Access Channel mass value is descending pilot frequency performance number or a snr value in the terminal current area.
The described terminal of steps A detect current to the affiliated subdistrict base station or the distance value that oppositely inserts target cell base station be detected by the GPS locate mode;
The described Random Access Channel mass value of steps A is by the sense terminals current area or oppositely insert in the Target cell descending pilot frequency power or signal to noise ratio is determined;
The described terminal current movement speed of steps A is to determine by variation speed that detects the descending pilot frequency quality or GPS.
Step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of code division multiplexing CDM mode, and process is:
The signature sequence with different time domain length that Access Preamble is comprised divides into groups in advance, terminal according to step B the time length of field of definite Access Preamble type select signature sequence in one of them group to be included in the Access Preamble to send;
After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and adopt the time-domain window of different length to catch this Access Preamble.
Step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of frequency division multiplexing FDM mode, and process sends take the Access Preamble of different frequency bands according to the time length of field setting of the definite Access Preamble type of step B by: terminal after; After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and catch this Access Preamble by the time-domain window on the different frequency bands.
Step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of time division multiplexing tdm mode, and process sends take the Access Preamble of different time-gap of same frequency band according to the time length of field setting of the definite Access Preamble type of step B by: terminal after; After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and adopt time-domain window to catch Access Preamble by different time-gap.
A kind of emitter that in random access procedure, sends Access Preamble, this device comprises: n Access Preamble generator, prefix types selector, Random Access Channel, modulating in OFDM module and antenna, wherein, n Access Preamble generator sends to the prefix types selector behind the different Access Preamble of length of field when generating respectively; The prefix types selector, according to terminal to current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal, after from the different Access Preamble of the time length of field of n Access Preamble generator transmission, selecting a corresponding Access Preamble, send to Random Access Channel; Random Access Channel will send to the OFDM modulation module from the Access Preamble that prefix type selecting device receives; The OFDM modulation module will carry out OFDM modulation back from the Access Preamble that Random Access Channel receives and go out by described antenna transmission.
A kind of emitter that in random access procedure, sends Access Preamble, this device comprises: different length signature sequence selector, DFT conversion module, subcarrier mapping block, OFDM modulation module and antenna, wherein, different length signature sequence selector, according to terminal to current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal, select the signature sequence of a respective length, send to the DFT conversion module; The DFT conversion module carries out the DFT conversion to the signature sequence of the respective length that receives from different length signature sequence selectors, sends to the subcarrier mapping block again; The subcarrier mapping block is used for the signature sequence that carries out the respective length after the DFT conversion is shone upon, and will be mapped to through the signature sequence after the DFT conversion on the subcarrier of OFDM symbol, sends to the OFDM modulation module again; The OFDM modulation module, on the subcarrier that is mapped to the OFDM symbol after the signature sequence after the DFT conversion carries out OFDM modulation, go out by described antenna transmission as Access Preamble.
Also comprise sending time slots selection module between OFDM modulation module and antenna, the signature sequence that is used for passing through the OFDM modulation is gone out by antenna transmission as Access Preamble through after the selection of sending time slots again.
From such scheme as can be seen, the present invention is the Access Preamble that a sub-district is provided with a plurality of different time domain length, terminal in the sub-district according to from the distance of affiliated base station or/and current accidental channel quality quality or/and the current translational speed speed of terminal adopts the Access Preamble that takies different time domain length to initiate random access procedure.Therefore, the present invention makes in the big sub-district from the nearer terminal of this cell base station or the fast terminal of translational speed and does not adopt the Access Preamble that takies length of field when long, thus the running time-frequency resource this sub-district that avoids waste in and prolong the time of access at random.
Description of drawings
Fig. 1 is the structural representation of prior art Access Preamble;
Fig. 2 sends the method flow diagram of Access Preamble in random access procedure for the present invention;
The structural representation of the Access Preamble that Fig. 3 provides for the embodiment of the invention one;
Fig. 4 is the emitter schematic diagram that sends Access Preamble in random access procedure;
Multiplexing structure 1 schematic diagram of Access Preamble that Fig. 5 provides for the embodiment of the invention four at FDM;
Fig. 6 a and Fig. 6 b are multiplexing structure 2 schematic diagrames at FDM of the embodiment of the invention five Access Preambles;
The multiplexing structural representation of Access Preamble that Fig. 7 provides for the embodiment of the invention six at TDM;
The dissimilar sub-district schematic diagram that Fig. 8 provides for the embodiment of the invention seven;
The Access Preamble structural representation that Fig. 9 provides for the embodiment of the invention eight;
The emitter schematic diagram that in random access procedure, sends Access Preamble that Figure 10 provides for the embodiment of the invention eight.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
The present invention according to terminal from the distance of affiliated base station or/and current accidental channel quality quality adopts the Access Preamble that takies different time domain length, like this, guarantee that promptly the base station captures the Access Preamble success rate that this terminal sends, save the running time-frequency resource of sub-district and the turn-on time at random of this terminal of shortening again, improved the access efficiency at random of this terminal.
In the present invention, when terminal when near or/and current accidental channel quality is good from affiliated base station, for terminal distribution takies the Access Preamble of length of field more in short-term; When terminal from affiliated base station far away or/and current accidental channel quality bad time, take the Access Preamble of length of field when longer for terminal distribution.Thereby can satisfy certain performance number when Access Preamble that terminal sends is received in affiliated base station, as certain average detected signal to noise ratio, this performance number provides when random access system is provided with by rule of thumb carrying out.
In the present invention, for the terminal in the less sub-district of radius ratio, can adopt the Access Preamble of first row shown in Figure 1.For the terminal in the bigger sub-district of radius ratio, according to terminal from the distance of affiliated base station or/and current accidental channel quality quality adopts the Access Preamble that takies different running time-frequency resources, promptly can adopt first row shown in Figure 1, secondary series or tertial Access Preamble.
The present invention can also adopt the Access Preamble of different time domain length according to the current translational speed of terminal, like this, can guarantee promptly that also the base station captures the Access Preamble success rate that this terminal sends, save the running time-frequency resource of sub-district and the turn-on time at random of this terminal of shortening again, improved the access efficiency at random of this terminal.
Fig. 2 is the present invention sends Access Preamble in random access procedure a method flow diagram, and its concrete steps are:
Step 200, the terminal to base station distance value is set or/and the Random Access Channel mass value or/and the corresponding relation between the Access Preamble type of the moving velocity of terminal and the different time domain length that adopts.
This corresponding relation can be arranged in the terminal, also can be provided with in the affiliated base station of terminal, by the downlink broadcast channel this correspondence relationship information is broadcast to terminal by base station under the terminal.
Step 201, terminal determine current to the base station distance value or/and the Random Access Channel mass value or/and the terminal current movement speed.
Terminal determines that current distance value can be definite by GPS location or other locate modes, determine that current Random Access Channel mass value can be recently definite by descending pilot frequency power in the detected cells or noise, determine that the size of current translational speed can be undertaken by variation speed, global positioning system (GPS) or other speed-measuring methods that detects the descending pilot frequency quality.
The Random Access Channel mass value can be descending pilot frequency performance number or snr value in the sub-district.
Step 202, terminal are determined current distance value according to the corresponding relation that is provided with or/and the Random Access Channel mass value sends after or/and after the Access Preamble type of terminal current movement speed correspondence, adopting the type setting to send to the Access Preamble of current affiliated subdistrict base station.
In step 201, whether the sub-district that terminal can also be prejudged current place is the sub-district with a plurality of Access Preamble types, and the foundation of judgement is to determine according to the information that place cell downlink broadcast channel sends, if then execution in step 201; Otherwise, adopt the Access Preamble of this sub-district regulation to initiate random access procedure according to process of the prior art.Correspondingly, when the sub-district has a plurality of Access Preamble type, can send the information that this sub-district of sign has a plurality of Access Preamble types of carrying by the downlink broadcast channel by the base station of this sub-district of administration.
In the present invention, if when terminal is switched or under other correlation circumstances, terminal not only can be determined to the distance value of current place cell base station or/and the Random Access Channel mass value, or/and terminal current movement speed, the distance value that can also be determined to reverse access target cell base station is or/and the Random Access Channel mass value, or/and terminal current movement speed, thereby select corresponding Access Preamble to send to reverse access Target cell, oppositely insert target cell base station and select corresponding Access Preamble to send to the definite method of reverse access Target cell as shown in Figure 2.
In the present invention, the Access Preamble that takies different time domain length can adopt the mode of code division multiplexing (CDM), frequency division multiplexing (FDM) or Time Division Multiplexing to carry out sending to affiliated base station after multiplexing.For example, adopt the CDM mode, signature sequence in the Access Preamble can be divided into groups, the time length of field of the prefix of signature sequence correspondence on the same group is not different, or/and the signature sequence of Random Access Channel mass value in selecting not on the same group is included in the Access Preamble sends, the base station uses the time-domain window of different length to catch Access Preamble to terminal under the terminal according to current distance value; Adopt the FDM mode, be that the Access Preamble of different time domain length takies different frequency bands and sends in Random Access Channel, or/and the Random Access Channel mass value selects frequency band corresponding to send Access Preamble, the base station adopts the time-domain window on the different frequency bands to catch Access Preamble to terminal under the terminal according to current distance value; The TDM mode, be that the different time-gap that the Access Preamble of different time domain length takies identical frequency band sends in Random Access Channel, or/and the Random Access Channel mass value is selected corresponding time slot transmission Access Preamble on the frequency band, the base station adopts time-domain window to catch Access Preamble by different time-gap to terminal under the terminal according to current distance value.
Below lift several specific embodiment explanation the present invention.
Embodiment one
The assumed wireless communication system is orthogonal frequency division multiplexing multiple access (OFDMA) system, and this system supports the Access Preamble of 3 kinds of different time domain length, as shown in Figure 3.Wherein, Access Preamble 1 is the shortest Access Preamble, is made up of a signature sequence, and this signature sequence adds that less than a physical frame guard time is a physical frame; Access Preamble 2 is second long Access Preambles, is made up of the signature sequence of two repetitions, adds that two guard times have constituted two physical frames; Access Preamble 3 is the longest Access Preambles, is made up of the signature sequence of three repetitions, adds that three guard times have constituted three physical frames.
Plant two threshold value A 1 of setting and A2 in this system, when terminal detected the descending pilot frequency signal to noise ratio more than or equal to A1, terminal adopted Access Preamble 1; When terminal detects the descending pilot frequency signal to noise ratio less than A1 during more than or equal to A2, terminal adopts Access Preamble 2; When terminal detected the descending pilot frequency signal to noise ratio less than A2, terminal adopted Access Preamble 3.A1 and A2 are when being provided with in this system, are drawn by experience.
Like this, just can be divided three classes, adopt different Access Preambles to carry out random access procedure respectively in the terminal of this system.
Fig. 4 is the emitter schematic diagram that sends Access Preamble in random access procedure, this emitter generally is used to the system that adopts OFDM multiplexing, wherein, this system comprises n Access Preamble generator, send to the prefix types selector behind the different Access Preamble of length of field when generating respectively, after the prefix types selector is selected one of them Access Preamble according to current Random Access Channel mass value, after sending to Random Access Channel, carry out OFDM modulation back by the OFDM modulation module and go out by antenna transmission.
The present invention receives the receiving system of Access Preamble in random access procedure same as the prior art, just when catching Access Preamble, and the different Access Preamble of length of field when catching respectively.
Embodiment two
The assumed wireless communication system is an ofdm system, this system supports the Access Preamble of 3 kinds of different time domain length: Access Preamble 1 is the shortest Access Preamble, be made up of a signature sequence, this signature sequence adds that less than a physical frame guard time is a physical frame; Access Preamble 2 is second long Access Preambles, is made up of the signature sequence of two repetitions, adds that two guard times have constituted two physical frames; Access Preamble 3 is the longest Access Preambles, is made up of the signature sequence of three repetitions, adds that three guard times have constituted three physical frames.
Two threshold value B1 and B2 are set in system, and when terminal detected current translational speed and is not less than B1, Access Preamble adopted Access Preamble 1; When terminal detects current translational speed less than B1 during greater than B2, Access Preamble adopts Access Preamble 2; When terminal detected current translational speed and is not more than B2, Access Preamble adopted Access Preamble 3.Threshold value B1 and B2 are provided by experience when being provided with.
Like this, the terminal of this system is divided into 3 classes, adopts dissimilar Access Preambles respectively, the short Access Preamble of employing length that present speed is high, the long Access Preamble of employing length that present speed is low.This system also can adopt system shown in Figure 4, after only at this moment the prefix types selector is selected one of them Access Preamble according to current moving velocity of terminal, sends to Random Access Channel.
Embodiment three
The assumed wireless communication system is an ofdm system, and this system supports the Access Preamble of 2 kinds of different time domain length: Access Preamble 1 is short Access Preamble, is made up of a signature sequence, accounts for N continuous OFDM symbol; Access Preamble 2 is long Access Preambles, is made up of the signature sequence of two repetitions, accounts for 2N continuous OFDM symbol.
The threshold value A of two pilot frequency intensities and the threshold value B of moving velocity of terminal are set in system, are not less than B, adopt Access Preamble 1 when terminal detects current translational speed; When detecting current translational speed, terminal during less than A, adopts Access Preamble 2 less than B and pilot frequency intensity; When terminal detects current translational speed and is not less than A less than B and pilot frequency intensity, adopt Access Preamble 1.Threshold value A and threshold value B are provided by experience when being provided with.
Like this, the terminal of this system is divided into 2 classes, adopts dissimilar Access Preambles respectively, the short Access Preamble of employing length that present speed is high, the Access Preamble that the employing length that present speed is low and pilot frequency intensity is little is long.This system also can adopt system shown in Figure 4, only at this moment behind the Access Preamble of prefix types selector according to current moving velocity of terminal and two prefix sequence generators generations of Random Access Channel mass value selection, sends to Random Access Channel.
Embodiment four
The Access Preamble of different time domain length is carrying out can adopting the CDM mode when multiplexing, and promptly the Access Preamble of different time domain length takies identical running time-frequency resource, distinguishes by different sequence codes.The signature sequence of supposing Access Preamble is concentrated M signature sequence, it is divided into 3 groups, wherein in the structure that first group is used in Access Preamble shown in Figure 31, in the structure that second group is used in Access Preamble shown in Figure 32, the 3rd group is used in the structure of Access Preamble shown in Figure 33.
As shown in Figure 5, the Access Preamble of different structure is overlapping on time-frequency domain, distinguishes by different signature sequences.Because generally, the cross correlation between the different signature sequences is less, such as adopting Walsh sequence, GCL sequence and PN sequence etc. as signature sequence, so the interference between the different Access Preambles is less, can not influence catching of base station Access Preamble.
Embodiment five
The Access Preamble of different length of fields is constantly carrying out can adopting the FDM mode when multiplexing, the Access Preamble that is different time domain length takies different frequency bands, behind the Access Preamble of determining to be adopted when terminal, send Access Preamble on frequency band corresponding, the base station adopts the time-domain window of different length to detect Access Preamble on different frequency bands.
Shown in Fig. 6 a and Fig. 6 b, different Access Preambles is not overlapping on frequency domain, and it adopts different frequency bands, so does not disturb mutually.Be made up of the Access Preamble on these 3 frequency bands in Random Access Channel, the CDM mode takies more relatively running time-frequency resource relatively.Wherein, among Fig. 6 b, Access Preamble 1 has 3 access slots in 3 frames, access slot than other Access Preambles is many, the benefit of this set is in big sub-district, and the common terminal near from the base station is many, inserts when more time slot can satisfy than the multiple terminals.
Embodiment six
The Access Preamble of different time domain length is carrying out can adopting the TDM mode when multiplexing, and promptly the Access Preamble of different time domain length takies identical frequency band, but takies different time slots.Behind the Access Preamble of determining to be adopted when terminal, send the Access Preamble that is adopted on corresponding time slot, the base station then adopts time-domain window to catch Access Preamble on different time slots.
As shown in Figure 7, the Access Preamble of different time domain length is not overlapping at time-frequency domain, and it is multiplexing on different time slots, does not therefore disturb each other.Random Access Channel is made up of the time-frequency piece on this frequency band, and CDM takies more relatively running time-frequency resource relatively.
Embodiment seven
At cell mobile communication systems, the difference in size of the radius of society of zones of different is bigger.Radius of society such as suburb and remote districts is more much bigger than the radius of society of city busy section of town.
Size according to radius of society is divided into Small with the sub-district, Medium, three kinds of Large.For the sub-district of Small, the radius of its sub-district is less, comprises one type terminal, promptly uses short circuit to go into the terminal of prefix.For the sub-district of Medium, its sub-district comprises two types terminal, promptly uses short circuit to go into the terminal of prefix and uses second short circuit to go into the terminal of prefix.For the sub-district of Large, its sub-district comprises 3 types terminal, promptly uses short circuit to go into the terminal of prefix, uses second short circuit to go into the terminal of prefix, uses the terminal of long Access Preamble.
Terminal is for the identification of dissimilar sub-districts, is to obtain by the reception that enters behind this sub-district the information of downlink broadcast channel.After the base station was set up, according to the coverage of this base station, the sub-district that is covered was set to corresponding type, and this information is entered the terminal of this sub-district by the downlink broadcast channel notification.
As shown in Figure 8: the sub-district of Small is because radius is less, and one type Access Preamble just can meet the demands, and the sub-district of Medium needs two types Access Preamble, and the sub-district of Large needs three types Access Preamble.Wherein, the drawn zone of oblique line is the zone that Access Preamble 1 is covered, and the drawn zone of rice word is the zone that Access Preamble 2 is covered; The drawn zone of vertical line is the zone that Access Preamble 3 is covered.
Embodiment eight
The Access Preamble of different time domain length also can be realized in a physical frame.Such as, establishing the sub-carrier number that ofdm system comprises is that 512, one physical frames comprise 8 OFDM symbols.The sub-carrier number of wherein distributing to Random Access Channel is continuous 128 subcarriers.As shown in Figure 9, Access Preamble is divided into two classes, a kind ofly accounts for continuous 4 OFDM symbols, another kind accounts for continuous 8 OFDM symbols.Such as, adopt the Walsh sign indicating number to be used as Access Preamble, first kind is adopted length is 512 Walsh sign indicating number, second kind is adopted length is 1024 Walsh sign indicating number.First kind of Access Preamble lined up the array of 128 row, 4 row, and every row are mapped on 128 subcarriers of OFDM symbol respectively through behind 128 the Fourier transform (DFT), goes out by antenna transmission through OFDM modulation back.4 row send by 4 continuous OFDM symbols, can select preceding 4 OFDM symbols or back 4 OFDM symbols of a frame to send at random, second kind of Access Preamble lined up the array of 128 row, 8 row, every row are respectively through after 128 the DFT conversion, be mapped on 128 subcarriers of OFDM symbol, go out by antenna transmission through OFDM modulation back.Two kinds of Access Preambles are by the mode of code division multiplexing.Such as, be that call number is that the Walsh sign indicating number of even number is distributed to first kind of Access Preamble at random, i.e. Walsh as Access Preamble in 512 the Walsh sign indicating number with length
0 512, Walsh
2 512..., Walsh
510 512Deng 256.Be that call number is that the Walsh sign indicating number of odd number is distributed to second kind of Access Preamble at random, i.e. Walsh as Access Preamble in 1024 the Walsh sign indicating number with length
1 1024, Walsh
3 1024..., Walsh
1023 1024Deng 512.Two kinds of Access Preambles are multiplexing on Random Access Channel, and are mutually orthogonal on the sign indicating number territory, can not form the phase mutual interference.
Perhaps, the division methods of Walsh sign indicating number also can be as follows: be preceding Ns of 512 Walsh sign indicating number is used as signature sequence and distributes to first kind of Access Preamble with length, that is, and Walsh
0 512, Walsh
1 512, Walsh
2 512..., Walsh
Ns-1 512With remaining length is the subcode that 512 Walsh sign indicating number expands to length 1024, that is, and and (Walsh
Ns 1024, Walsh
512+Ns 1024), (Walsh
Ns+1 1024, Walsh
512+Ns+1 1024), (Walsh
Ns+2 1024, Walsh
512+Ns+2 1024) ..., (Walsh
511 1024, Walsh
512+511 1024), after distribute to second kind of Access Preamble, adopt this method, can choose the number of signature sequences purpose ratio of two kinds of Access Preambles arbitrarily, determine by Ns.
Realize that emitter that above-mentioned Access Preamble sends as shown in figure 10: terminal is according to current affiliated subdistrict base station or oppositely insert the distance of target cell base station, or/and Random Access Channel mass value, or/and moving velocity of terminal, in different length signature sequence selector, select the signature sequence of appropriate length, signature sequence is through the DFT conversion of DFT conversion module, subcarrier mapping through the subcarrier mapping block, to be mapped to through the signature sequence after the DFT conversion on the subcarrier of OFDM symbol, after the OFDM modulation through the OFDM modulation module, select module to select suitable time slot to send by sending time slots.For the Walsh sign indicating number on 512 rank, can select preceding 4 OFDM symbols or back 4 OFDM symbols of a physical frame; Walsh sign indicating number for 1024 rank sends in the beginning of a physical frame.
The present invention is provided with the Access Preamble of several different time domain length in same sub-district, to satisfy in the sub-district apart from the far and near difference in base station or/and the needs of the different terminal of channel quality: the long Access Preamble of length of field when terminal far away adopts from the base station, to improve the signal to noise ratio of Access Preamble, increase the acquisition probability of base station to Access Preamble; The short Access Preamble of length of field when near terminal adopts from the base station to reduce the running time-frequency resource of the shared sub-district of single Access Preamble, improves the sub-district utilization rate of time-frequency resources, and improves the speed of random access procedure.
In the present invention, also proposed the multiplexing method of the Access Preamble of several different time domain length, can be provided with flexibly according to the needs of current random access system.
In the present invention, the sub-district of different radii is distinguished, the Access Preamble of length of field when a kind of is adopted in little sub-district, and the Access Preamble of length of field when multiple is adopted in big sub-district, thereby has improved the overall performance of random access system.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (21)
1. method that in random access procedure, sends Access Preamble, it is characterized in that, Access Preamble type with different time domain length is set in the sub-district, and the terminal to base station distance value is set or/and the Random Access Channel mass value or/and the corresponding relation between the Access Preamble type of moving velocity of terminal and different time domain length, this method also comprises:
A, terminal detect current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal;
B, terminal determine detected distance value according to the corresponding relation that is provided with or/and the Random Access Channel mass value sends after or/and the corresponding Access Preamble type of terminal current movement speed, sending to current affiliated subdistrict base station or oppositely insert the Access Preamble of target cell base station according to the time length of field setting of the type.
2. the method for claim 1 is characterized in that, in orthogonal frequency division multiplex OFDM system, the described process that Access Preamble is sent of step B is:
Access Preamble is carrying transmission on the OFDM symbol continuously.
3. method as claimed in claim 2 is characterized in that, described process with Access Preamble carrying transmission on continuous OFDM symbol is:
The signature sequence of Access Preamble is divided into a described continuous OFDM number of symbols subsequence, behind each subsequence process discrete Fourier transform (DFT) DFT, is mapped on the continuous subcarrier of OFDM symbol, after the OFDM modulation, go out by antenna transmission.
4. method as claimed in claim 2 is characterized in that, comprises in the ofdm system of 8 OFDM symbols and when Access Preamble is divided into two types at each physical frame, and the Access Preamble process that carrying sends on OFDM symbol continuously is:
Its short-and-medium Access Preamble is modulated at carrying transmission on 4 continuous OFDM symbols, and wherein Chang Access Preamble is modulated at carrying transmission on 8 continuous OFDM symbols.
5. method as claimed in claim 3 is characterized in that, described signature sequence is Walsh sign indicating number sequence, GCL sequence or DFT sequence.
6. method as claimed in claim 5 is characterized in that, when described signature sequence is the Walsh sign indicating number, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
Be that Ns Walsh sign indicating number sequence in the Walsh sign indicating number of N1 is as the signature sequence of its short-and-medium Access Preamble with exponent number; With the exponent number on the child node of remaining N1-Ns N1 rank Walsh code tree is the signature sequence of the Walsh sign indicating number sequence of N2=2 * N1 as wherein long Access Preamble.
7. method as claimed in claim 6 is characterized in that, the exponent number N1 of described Walsh sign indicating number can be 512, and N2 is 1024.
8. method as claimed in claim 6 is characterized in that, the exponent number N1 of described Walsh sign indicating number is 512, and N2 is 1024 o'clock, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is:
Wherein the Walsh sign indicating number of Chang Access Preamble is:
9. method as claimed in claim 6 is characterized in that, the exponent number N1 of described Walsh sign indicating number is 512, and N2 is 1024 o'clock, and Access Preamble is when being divided into two types, and the selection course of described signature sequence is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is:
Wherein the Walsh sign indicating number of Chang Access Preamble is:
10. method as claimed in claim 4 is characterized in that, the described Access Preamble that it is short-and-medium is modulated on 4 continuous OFDM symbols carrying and sends, and wherein Chang Access Preamble is modulated at the process of carrying transmission on 8 continuous OFDM symbols and is:
The Walsh sign indicating number of the Access Preamble that it is short-and-medium is divided into 128 row, 4 row, and every row are mapped on 128 continuous subcarriers of OFDM symbol respectively through after 128 the DFT conversion, after the OFDM modulation, go out by antenna transmission; The Walsh sign indicating number of long Access Preamble is divided into 128 row, 8 row, and every row are mapped on 128 continuous subcarriers of OFDM symbol respectively through after 128 the DFT conversion, after the OFDM modulation, go out by antenna transmission.
11. method as claimed in claim 4 is characterized in that, sends in preceding 4 OFDM symbols of the physical frame of selection that the transmission of described its short-and-medium Access Preamble can be at random or back 4 the OFDM symbols.
12. the method for claim 1 is characterized in that, before steps A, this method also comprises:
Terminal is according to current place cell base station or oppositely insert target cell base station and determine sub-district, current place or oppositely insert the Access Preamble type whether Target cell is provided with different time domain length by the Access Preamble type information that whether is provided with different time domain length that the downlink broadcast channel sends, if, execution in step A; Otherwise, send to the current area base station or oppositely insert target cell base station after the Access Preamble type that directly adopts sub-district, current place or oppositely insert the Target cell setting is provided with Access Preamble.
13. method as claimed in claim 12 is characterized in that, described terminal current place cell base station or the process that oppositely inserts the Access Preamble type information that whether is provided with different time domain length that target cell base station sends by the downlink broadcast channel are:
Terminal current place cell base station or oppositely insert target cell base station determines whether to be provided with different time domain length in the sub-district according to the radius size of institute's coverage cell when setting up Access Preamble type, if then send the Access Preamble type information that is provided with different time domain length by the downlink broadcast channel; Otherwise, then the Access Preamble type information of different time domain length is not set or does not send information by the transmission of downlink broadcast channel.
14. the method for claim 1 is characterized in that, described Random Access Channel mass value is descending pilot frequency performance number or a snr value in the terminal current area.
15. the method for claim 1 is characterized in that, the described terminal of steps A detect current to the affiliated subdistrict base station or the distance value that oppositely inserts target cell base station be detected by the GPS locate mode;
The described Random Access Channel mass value of steps A is by the sense terminals current area or oppositely insert in the Target cell descending pilot frequency power or signal to noise ratio is determined;
The described terminal current movement speed of steps A is to determine by variation speed that detects the descending pilot frequency quality or GPS.
16. the method for claim 1 is characterized in that, step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of code division multiplexing CDM mode, and process is:
The signature sequence with different time domain length that Access Preamble is comprised divides into groups in advance, terminal according to step B the time length of field of definite Access Preamble type select signature sequence in one of them group to be included in the Access Preamble to send;
After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and adopt the time-domain window of different length to catch this Access Preamble.
17. the method for claim 1 is characterized in that, step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of frequency division multiplexing FDM mode, and process is:
Terminal according to step B the time length of field setting of definite Access Preamble type send after taking the Access Preamble of different frequency bands;
After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and catch this Access Preamble by the time-domain window on the different frequency bands.
18. the method for claim 1 is characterized in that, step B is described to send to current affiliated subdistrict base station with Access Preamble or oppositely inserts target cell base station by the multiplexing transmission of time division multiplexing tdm mode, and process is:
Terminal according to step B the time length of field setting of definite Access Preamble type send after taking the Access Preamble of different time-gap of same frequency band;
After step B, this method also comprises: terminal current affiliated subdistrict base station or oppositely insert target cell base station and adopt time-domain window to catch Access Preamble by different time-gap.
19. an emitter that sends Access Preamble in random access procedure is characterized in that this device comprises: n Access Preamble generator, prefix types selector, Random Access Channel, modulating in OFDM module and antenna, wherein,
N Access Preamble generator sends to the prefix types selector behind the different Access Preamble of length of field when generating respectively;
The prefix types selector, according to terminal to current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal, after from the different Access Preamble of the time length of field of n Access Preamble generator transmission, selecting a corresponding Access Preamble, send to Random Access Channel;
Random Access Channel will send to the OFDM modulation module from the Access Preamble that prefix type selecting device receives;
The OFDM modulation module will carry out OFDM modulation back from the Access Preamble that Random Access Channel receives and go out by described antenna transmission.
20. an emitter that sends Access Preamble in random access procedure is characterized in that this device comprises: different length signature sequence selector, DFT conversion module, subcarrier mapping block, OFDM modulation module and antenna, wherein,
Different length signature sequence selector, according to terminal to current affiliated subdistrict base station or oppositely insert target cell base station distance value or/and the Random Access Channel mass value or/and moving velocity of terminal, select the signature sequence of a respective length, send to the DFT conversion module;
The DFT conversion module carries out the DFT conversion to the signature sequence of the respective length that receives from different length signature sequence selectors, sends to the subcarrier mapping block again;
The subcarrier mapping block is used for the signature sequence that carries out the respective length after the DFT conversion is shone upon, and will be mapped to through the signature sequence after the DFT conversion on the subcarrier of OFDM symbol, sends to the OFDM modulation module again;
The OFDM modulation module, on the subcarrier that is mapped to the OFDM symbol after the signature sequence after the DFT conversion carries out OFDM modulation, go out by described antenna transmission as Access Preamble.
21. device as claimed in claim 20, it is characterized in that, also comprise sending time slots selection module between OFDM modulation module and antenna, the signature sequence that is used for passing through the OFDM modulation is gone out by antenna transmission as Access Preamble through after the selection of sending time slots again.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2006101151432A CN101094511B (en) | 2006-06-23 | 2006-08-25 | Method and device for sending access prefix in random access procedure |
| PCT/CN2007/070161 WO2008000189A1 (en) | 2006-06-23 | 2007-06-22 | A method and devices for sending the access preamble in the course of random access |
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| CN200610082998 | 2006-06-23 | ||
| CN200610082998.X | 2006-06-23 | ||
| CN2006101151432A CN101094511B (en) | 2006-06-23 | 2006-08-25 | Method and device for sending access prefix in random access procedure |
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| CN101166362B (en) * | 2006-10-20 | 2011-03-16 | 华为技术有限公司 | Method and equipment for originating and detecting reverse access |
| CN102215598B (en) * | 2010-04-02 | 2016-03-30 | 中兴通讯股份有限公司 | A kind of accidental access method and device |
| US9794959B2 (en) * | 2013-01-17 | 2017-10-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic random access resource size configuration and selection |
| CN105050078A (en) * | 2015-07-13 | 2015-11-11 | 广州番禺职业技术学院 | Enhanced physical layer safety communication system and method |
| US10178699B2 (en) * | 2016-09-07 | 2019-01-08 | Qualcomm Incorporated | Random access enhancement based on scalable signature design |
| WO2020227950A1 (en) * | 2019-05-15 | 2020-11-19 | Qualcomm Incorporated | Two-step random access channel configuration |
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| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
| CN1511138A (en) * | 2000-12-22 | 2004-07-07 | ��ʽ�����װ | Access parameter adaptation and packet data resource management using detailed mobile status information |
| JP2004297338A (en) * | 2003-03-26 | 2004-10-21 | Sanyo Electric Co Ltd | Base station apparatus, communication method of base station apparatus, communication program, and wireless communication system |
| US6882841B1 (en) * | 1998-08-04 | 2005-04-19 | Lg Information And Communications, Ltd. | Method for performing an enhanced random access using information of forward common channels in a mobile communication system |
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| KR100526508B1 (en) * | 1999-08-17 | 2005-11-08 | 삼성전자주식회사 | apparatus and method for access communicating in cdma communication system |
| US6711150B1 (en) * | 2000-04-07 | 2004-03-23 | Telefonktiebolaget L.M. Ericsson | System and method for data burst communications in a CDMA network |
| CN1384626A (en) * | 2001-04-29 | 2002-12-11 | 华为技术有限公司 | Random access transmission method of common block channel |
| CN1531231A (en) * | 2003-03-12 | 2004-09-22 | 北京三星通信技术研究有限公司 | Method and device for connecting guide in subchannel of orthogonal FDM communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6882841B1 (en) * | 1998-08-04 | 2005-04-19 | Lg Information And Communications, Ltd. | Method for performing an enhanced random access using information of forward common channels in a mobile communication system |
| CN1511138A (en) * | 2000-12-22 | 2004-07-07 | ��ʽ�����װ | Access parameter adaptation and packet data resource management using detailed mobile status information |
| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
| JP2004297338A (en) * | 2003-03-26 | 2004-10-21 | Sanyo Electric Co Ltd | Base station apparatus, communication method of base station apparatus, communication program, and wireless communication system |
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