CN101369840B - TDD accidental access method, system and its composition modules - Google Patents
TDD accidental access method, system and its composition modules Download PDFInfo
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Abstract
The invention relates to a random access channel assignment method of a medium coverage system and a large coverage system in a TD-SCDMA evolution system based on the OFDM. The random access preamble sequence is able to be assigned at the back end of the up time slot as possible under the condition that bigger interference exists by adding a guard gap in the random access preamble sequence, thereby the technical problem that a TS0 time slot and a DwPTS time slot of the distal cell generate interference to self-cell random access preamble sequence in the medium coverage system and the large coverage system. The assignment of the random access channel is more flexible by using the invention, and the detection success probability of the preamble sequence from the base station is improved.
Description
Technical field
The present invention relates to based on OFDM (Orthogonal Frequency Division Multiplexing; OFDM) Time Division-Synchronous Code Division Multiple Access (Time Division-Synchronous Code DivisionMultiple Access; TD-SCDMA) access technology at random in the evolution system, TDD accidental access method, system and the composition module thereof of particularly a kind of medium covering and big covering system.
Background technology
TD-SCDMA is unique employing time division duplex (TDD) mode in the 3-G (Generation Three mobile communication system) three big international standards, supports the international standard of up-downgoing non-symmetrical service transmission, on spectrum utilization, has bigger flexibility.This system synthesis has adopted the advanced technology in the radio communications such as smart antenna, uplink synchronous, joint-detection and software radio, makes system have the higher performance and the availability of frequency spectrum.Along with the development and the development of technology of society, people improve constantly the requirement of mobile communication, hope that system can provide the data transport service of big capacity, two-forty, low time delay.In order to satisfy this growing demand, the TD-SCDMA system needs continuous evolution equally and improves performance.
In the evolution scheme of TD-SCDMA, in order to obtain the jumbo service of two-forty, need take wideer bandwidth, therefore it is referred to as broad band time division duplex honey comb system.In broad band time division duplex honey comb system, the common size of cell covered radius as required is divided into Three Estate with it, and 0km～10Km coverage is commonly referred to little covering, and 10km～70km is middle covering, and 70km is above to be big the covering.
The non-synchronized random of broad band time division duplex honey comb system inserts the detection that preamble (preamble) sequence is used for up clock synchronization and UE identifier; In the broad band time division duplex honey comb system of medium covering and big covering design; Preamble sequence next-door neighbour up-downgoing transfer point; And the up-downgoing just up-downgoing protection of respective cell radius change-over time of this moment, so the signal of base station of neighbor cell possibly interfere with the preamble of the access at random sequence of this sub-district.In fact, the data slot of this sub-district after up-downgoing protection at interval also can be interfered, and still, for data channel, is to avoid through what scheduling was disturbed, and adopts other interference to avoid or cancellation.Even data block demodulation mistake also can guarantee correct reception through retransmitting.But for RACH, big interference is very large to the influence of user terminal (UE), can reduce the access success rate of UE, prolongs the time that UE inserts at random, and is also very big to the concrete influence of using of user.
Fig. 1 (a) is the frame structure of original TD-SCDMA evolution system in the broad band time division duplex honey comb system; Fig. 1 (b) is the frame structure under the big coverage condition in the broad band time division duplex honey comb system; TS0 is fixed as descending time slot among the figure; DwPTS is a descending pilot frequency time slot, and GP is up-downgoing protection interval, and UpPTS is a uplink pilot time slot.Among the figure, indicate ↑ expression be ascending time slot, indicate ↓ expression be descending time slot, the dotted line between TS4 and TS6 or the TSx is represented to omit, the time slot in the middle of not drawing.TSx representes x time slot in big covering system, owing to its be up or descending time slot uncertain, therefore, do not mark its up-downgoing attribute in the drawings.Because in big covering system, what RACH took is the resource of frequency domain, can not resemble and represent with the mode of UpPTS time slot the little covering system, therefore in the big covering system of Fig. 1 (b), identify with preamble sequence.
Among Fig. 1 (b), insert preamble sequence next-door neighbour GP at random and distribute, wherein, the twice of the length respective cell radius of GP, promptly 2 times of radius of societies are apart from the time that the light velocity experienced of correspondence.Under medium covering and big coverage condition, in order to satisfy the requirement of base station received signal to noise ratio, the situation of the relatively little covering of preamble sequence need prolong accordingly.Under medium covering and big coverage condition; When this sub-district UE sends when inserting the preamble sequence at random to this cell base station; These insert the preamble sequence at random will arrive this cell base station together with the TS0 time slot or the DwPTS time slot signal of far end cell, that is to say that this sub-district is inserted the preamble sequence at random and received far end cell; The ground floor sub-district outside this sub-district for example, TS0 time slot and the interference of DwPTS time slot signal.In fact, the upstream data time slot of this sub-district UE is like TS2, TS3 etc.; Also received the interference of far end cell TS0 time slot and DwPTS time slot; But owing to what wherein transmit is data, and concrete transfer of data can perhaps adopt interference coordination through dispatching between the base station; Perhaps adopt the method for avoiding of disturbing, reduce the influence of far end cell this cell uplink data slot.Even data block wherein faults occurred under situation about disturbing, so also can guarantee correct transmission through the mode that retransmits.But far end cell TS0 time slot and DwPTS time slot signal disturb for the preamble sequence, and its influence is very big.These disturb and can reduce the quality of reception of this cell base station to the preamble sequence, make access at random be detected as power and reduce.After the preamble sequence of sending UE inserts at random, in it waits for the feedback time of base station, corresponding channel is received detection, see if there is the access of returning from base station feedback and successfully indicate.Because the existence of disturbing, the decreased performance of preamble sequence is detected in the base station, causes correctly detecting the preamble sequence, and the base station can not correctly detected under the situation of preamble sequence, is not send to feed back to UE's.If UE less than feedback signal, will wait for always that in the corresponding feedback Channel Detection overtime up to the predefined stand-by period, UE just can initiate once to insert at random in addition again.Because last access at random detects; A lot of UE do not receive correct feedback information; In the ensuing moment, just have more UE and send the preamble sequence, thereby the performance that causes the base station to detect a plurality of preamble sequences further descends to this cell base station.
In sum, the interference of far end cell TS0 time slot and DwPTS time slot is very big to the influence of random access procedure, and then has had influence on the normal operation of whole communication system.
Summary of the invention
In view of this, one of the object of the invention provides a kind of distribution method of RACH, can solve far end cell TS0 time slot and the DwPTS time slot technical problem to the interference of random access preamble.
For achieving the above object, technical scheme of the present invention is achieved in that
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of TDD accidental access method; Mobile subscriber terminal is when inserting at random; Send preamble sequence through RACH to cell base station, comprise a white space, as the protection interval of said preamble sequence in said RACH inside.
Based on technique scheme, said protection is positioned at after the said preamble sequence at interval, is close to said preamble sequence.
Based on technique scheme, the span of said protection length blanking time is smaller or equal to the time that the light velocity experienced of 2 times of radius of societies apart from correspondence greater than zero.
Based on technique scheme, said preamble sequence and protection are allocated in away from the middle of the up-downgoing protection ascending time slot at interval at interval.
Based on technique scheme, said random access preamble sequence and protection thereof can be crossed over plural time slot at interval, and its total duration obtains according to following mode:
Length (preamble sequence+protection at interval)=N * Length (TS)
Wherein, Length representes to ask for the function of time span, and N is more than or equal to 1, and smaller or equal to the positive integer of all ascending time slot number summations, TS representes single time slot.
Based on technique scheme, said random access preamble sequence is the long synchronization code sequence that directly produces, or is undertaken forming after the repetition by short synchronization code sequence.
Based on technique scheme, said synchronization code sequence is Zadoff-Chu sequence, GCL sequence, Golay sequence or Barker sequence.
Based on technique scheme, the Zadoff-Chu sequence of using at 521, repeats the back with this Zadoff-Chu sequence of 521 and constitutes long said preamble sequence under big coverage condition as the benchmark synchronization code sequence.
Based on technique scheme, said 521 the Zadoff-Chu sequence number that constitutes said preamble sequence is the gained integer value that rounds up after radius of society removes 21.25 kilometers.
Another object of the present invention provides the AM access module at random of a kind of time division duplex terminal, comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
RACH forms module, is used for forming RACH according to said broadcast message and selected preamble sequence;
Sending module is used for through RACH preamble sequence being sent to cell base station;
The base station in response detection module is used for the base station in response channel detected and judges whether to insert successfully;
Said RACH includes a white space, as the protection interval of said preamble sequence.
Based on technique scheme, said preamble sequence and protection are positioned at away from the middle of the up-downgoing protection ascending time slot at interval at interval.
Based on technique scheme, said random access preamble sequence and protection thereof can be crossed over plural time slot at interval, and its total duration obtains according to following mode:
Length (preamble sequence+protection at interval)=N * Length (TS)
Wherein, Length representes to ask for the function of time span, and N is more than or equal to 1, and smaller or equal to the positive integer of all ascending time slot number summations, TS representes single time slot.
Another object of the present invention provides the AM access module at random of a kind of time division duplex base station, comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of RACH is broadcasted through broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the RACH;
The accidental access response module is used for through responsive channels detected preamble sequence being responded;
It is characterized in that said RACH includes a white space, as the protection interval of said preamble sequence.
Based on technique scheme, said base station AM access module at random comprises that also an ascending time slot is provided with module, is used for according to coverage and said preamble sequence and the shared at interval time slot width collocating uplink time slot of protection.
Based on technique scheme, also comprise a preamble sequence grouping module, be used for dividing into groups according to pairing minute set condition of each preamble sequence.
Another object of the present invention provides a kind of time division duplex random access system, comprises terminal AM access module and base station AM access module at random at random, and terminal AM access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
RACH forms module, is used for forming RACH according to said broadcast message and selected preamble sequence;
Sending module is used for through RACH preamble sequence being sent to cell base station;
The base station in response detection module is used for the base station in response channel detected and judges whether to insert successfully;
Base station AM access module at random comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of RACH is broadcasted through broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the RACH;
The accidental access response module is used for through responsive channels detected preamble sequence being responded;
Said RACH includes a white space, as the protection interval of said preamble sequence.
Based on technique scheme, said preamble sequence and protection are positioned at away from the middle of the up-downgoing protection ascending time slot at interval at interval.
The present invention is directed to broad band time division duplex honey comb system; Under medium covering and big coverage condition; The RACH design that self contains the protection interval that proposes does not require that the preamble sequence is close to the up-downgoing protection at interval, makes the distribution of RACH more flexible; The present invention will have protection preamble sequence at interval and place away from up-downgoing protection ascending time slot position at interval as far as possible; Allocation criteria according to this RACH; Can avoid the interference of telepoint base station as much as possible; Guarantee that this cell base station correctly detects RACH, thereby realize terminal access at random accurately and rapidly, inserting at random for ofdm system realization terminal provides effective solution.
Description of drawings
Fig. 1 (a) reaches the design drawing that inserts UpPTS at random for original TD-SCDMA evolution system frame structure;
Fig. 1 (b) is the frame structure of TD-SCDMA evolution system under big coverage condition;
The Preamble sequential structure of following the protection interval that Fig. 2 proposes for the present invention;
Fig. 3 (a) is RACH location assignment figure under the 5km coverage condition;
Fig. 3 (b) is RACH location assignment figure under the 30km coverage condition;
Fig. 3 (c) is RACH location assignment figure under the 100km coverage condition;
Fig. 4 (a) is RACH location assignment figure under the descending time slot 5km coverage condition for TS4;
Fig. 4 (b) is RACH location assignment figure under the descending time slot 30km coverage condition for TS4;
Fig. 4 (c) is RACH location assignment figure under the descending time slot 100km coverage condition for TS4;
Fig. 5 (a) is under the 20km coverage condition, uses random access channel structure figure under one 521 the Zadoff-Chu sequence situation;
Fig. 5 (b) is under the 40km coverage condition, uses random access channel structure figure under two 521 the Zadoff-Chu sequence situation;
Fig. 5 (c) is under the 60km coverage condition, uses random access channel structure figure under three 521 the Zadoff-Chu sequence situation;
Fig. 6 is the sequential step figure of random access procedure between UE and the base station;
Fig. 7 is the module composition diagram that inserts part at random of terminal and base station.
Embodiment
Core concept of the present invention is; Random access channel structure is designed again; Under the situation that can carry out the up channel distribution; Making this design RACH again can dispose in up channel flexibly; The TS0 time slot and the interference of DwPTS time slot to this sub-district preamble sequence of telepoint base station reduced as much as possible away from the moment that the TS0 time slot and the DwPTS time slot of telepoint base station arrives this sub-district in the transmission position of this sub-district being inserted at random the preamble sequence, thus the access speed that is detected as power and UE of raising RACH.
The present invention is for including a white space that does not send any data in RACH; The interior protection interval (GT) of this white space as the preamble sequence; Be used for eliminating the interference that the time uncertainty owing to the preamble sequence causes to the front and back data slot, as shown in Figure 2.Use this improved RACH distribution structure; RACH just needn't be limited to next-door neighbour GP and distribute; Because the preamble sequence in this RACH distribution structure has the protection interval of oneself; In the time of can avoiding the preamble sequence to move forward or backward, the data slot before and after interfering with.The span of GT is greater than zero in theory, smaller or equal to the distance twice required time of light velocity experience radius of society.The value of GT is configurable, under the situation that satisfies the base station received signal to noise ratio, mainly by its value size of base station antenna height decision.Generally, UE can estimate a Timing Advance and makes the preamble sequence of its transmission to arrive the base station constantly in its target when sending the preamble sequence.With Fig. 3 (b) is example; The target of preamble sequence constantly should be in TS3 time slot original position; If certain UE is at cell edge; This UE need shift to an earlier date the time of GT/2 when sending the preamble sequence, it sends the preamble sequence will arrive this cell base station in TS3 time slot original position, and the preamble sequence is owing to there has been the data slot of protecting before and after just can not having influence at interval like this.
Fig. 1 (b) can be found out with Fig. 3 (b) and Fig. 3 (c) contrast; In the distribution structure of the existing medium covering and the RACH of big covering system; The preamble sequence can only be distributed in the position that is close to GP; And under the situation that can carry out the up channel distribution, use band protection Preamble sequential structure at interval shown in Figure 2, the particular location that it sends in RACH; No longer one be positioned in first time slot of GP back, but can configuration flexibly in up channel.In the big covering system shown in Fig. 3 (c), under the bigger situation of interference ratio,, can place TS3 and TS4 time slot position with inserting the preamble sequence at random when TS3 and TS4 also are ascending time slots.The preamble sequence is placed TS3 and TS4 time slot position; Make the transmission position insert the preamble sequence at random away from the moment of telepoint base station TS0 time slot, thereby avoid the interference of telepoint base station TS0 time slot and DwPTS time slot this sub-district preamble sequence with this sub-district of DwPTS time slot arrival.
Fig. 4 (a) and Fig. 4 (c) have provided respectively under little coverage condition and the big coverage condition; TS4 is a descending time slot; Insert preamble sequence location allocative decision map at random, Fig. 4 (b) has provided middle coverage condition, inserts preamble sequence location allocative decision when TS3 is descending time slot at random.Under middle coverage condition,, insert the preamble sequence at random and can only be distributed in TS1 and TS2 time slot position because TS3 is descending.Under big coverage condition,, insert the preamble sequence at random and can only be distributed in TS2 and TS3 time slot position because TS4 is descending.Compare with the scheme that does not contain GT, in this RACH allocative decision, the preamble sequence can not take the time of GP, thereby the interference meeting of telepoint base station TS0 and DwPTS is little.In the reality, it is not in the very big sub-district that this structure is mainly used in that TS0 and DwPTS disturb.
Use the preamble of the access at random sequential structure that has the protection interval that the present invention designed; Allocation criteria in the RACH of medium covering and big covering system is: when enough up channels are arranged; Insert the distribution of preamble sequence location at random according to situation about disturbing; When interference ratio is bigger, be distributed in away from up-downgoing protection ascending time slot position at interval inserting preamble sequence and protection position at interval thereof at random as far as possible.Like this, under the situation that abundant ascending time slot is arranged, just can avoid the interference of telepoint base station.
The TS0 of concrete certain sub-district measures in the time of can carrying out initial setting up in the sub-district with the interference of DwPTS, and the distribution of carrying out RACH according to measured value get final product, needn't measure dynamically, and measure also more complicated dynamically and relatively be difficult to survey certainly.
The protection of the band that provides among Fig. 3 and Fig. 4 at interval insert the length that the preamble sequence length all is corresponding two time slots at random, in the reality, in order to guarantee detection probability, inserting preamble sequence and GT at random maybe be longer, just the length of N time slot.Promptly
Length (the preamble sequence+GT)=N * Length (TS)
Length representes to ask for the function of time span, and for medium covering, N is the integer more than or equal to 1, that is to say, the time span of preamble and GT can be placed in the time slot; For big covering, N can only get the integer greater than 1, because only the transmission that is used for carrying out preamble of time slot is not enough for big covering.The implication of above-mentioned formula is that preamble sequence and GT protection shared duration sum at interval equal the integral multiple of a time slot among the TD-SCDMA.
Disturbing under the more intense situation, band protection of the present invention at interval insert the preamble of the access at random sequence that the allocation criteria of preamble sequence in RACH is applicable to random length at random.
Adopt following method to produce the long preamble sequence of long radius sub-district in the specific embodiment of the invention:
The preamble sequence of A, directly generation length.The benefit of this method is that operable sequence number is many, but the complexity that produces long preamble sequence realizes comparatively difficulty than higher;
B, preamble sequence that will shorter length are carried out repetition, constitute long preamble sequence.The benefit of this method is that the abundant sequence number purpose while is being provided, and can avoid directly producing the high complexity of long sequence, can also improve the detection performance to a certain extent.
The selection of concrete preamble sequence can select to have the Zadoff-Chu sequence of good auto-correlation and their cross correlation, the GCL sequence, and the Golay sequence, or the Barker sequence etc.
In the present invention's one specific embodiment, use short Zadoff-Chu sequence, under middle covering and big coverage condition, should lack the Zadoff-Chu sequence and repeat, constitute long preamble sequence as synchronization code sequence.Among Fig. 5 (a), use one 521 Zadoff-Chu sequence, its time length is 533.33us, and protection length blanking time is 141.67us, and the respective cell radius is 21.25km.In Fig. 5 (b), use two 521 Zadoff-Chu sequence, promptly use 521 Zadoff-Chu sequence to repeat once, its time length is 1066.66us, and protection length blanking time is 283.34us, and the respective cell radius is 42.5km.In Fig. 5 (c), use three 521 Zadoff-Chu sequence, promptly use 521 Zadoff-Chu sequence to carry out repetition twice, its time length is 1599.99us, and protection length blanking time is 425.01us, and the respective cell radius is 63.75km.For bigger radius of society, the computing formula that constitutes 521 Zadoff-Chu sequence number of said preamble sequence is:
TRUNC (the radius of society milimeter number/21.25km)
TRUNC is the function that rounds up, and when being 84km like radius of society, 84km/21.25 is about 3.953, and rounding up is 4, promptly when the 84km kilometer covers, uses 4 521 Zadoff-Chu sequence to constitute said preamble sequence.When being 85km like radius of society, 85km/21.25 is 4, then uses 4 521 Zadoff-Chu sequence.When being 86km like radius of society, 86km/21.25 is about 4.05, then uses 5 521 Zadoff-Chu sequence, by that analogy.
Fig. 6 is the sequential step figure of random access procedure between UE and the base station, and according to the time sequencing that signal sends, whole random access procedure can be divided into 4 steps, below is described in detail:
Step 1: broadcast the spendable whole preamble sequence identifier of positional information and this sub-district of RACH the base station through broadcast channel.
Because the restriction of RACH length, the ascending time slot number of base station assigns also can receive certain restriction.Different with prior art is, adopts disclosed technical scheme, and the ascending time slot number of this moment must satisfy the requirement of sending RACH length.For medium covering, the base station will be distributed an ascending time slot at least, if RACH has taken the length of two ascending time slots, the base station will be distributed two ascending time slots at least so; For big covering, the base station will be distributed two ascending time slots at least, otherwise RACH can't distribute.In length, and the requirement of system uplink data volume according to RACH, distribute the ascending time slot number after, the base station is again according in the current area, the number that the initiation of estimation inserts the user at random distributes the number of RACH.Then, broadcast the positional information of RACH and the preamble sequence of this sub-district use the base station through broadcast channel.
In TD-SCDMA, the number of a spendable preamble sequence in sub-district has been planned when plot planning, is 16 like the planning number, and the preamble sequence broadcast that then cell base station can be available with all when broadcasting is downwards gone down, and is selected at random by UE oneself.
The present invention's one specific embodiment is for to the pairing channel transmission quality of terminal iidentification preamble sequence; The preamble sequence that all are available is divided into groups; Be divided into two groups like 16 sequences; Promptly divide into groups 1 with divide into groups 2, the sequence in 1 of selecting so to divide into groups, just implicit its down channel quality is relatively good; Divide into groups 2 if the sequence of selecting is arranged in, just implicit its down channel quality is poor.The condition of dividing into groups also can be selected some other parameter except that above-mentioned down channel quality.
Step 2: preamble sequence of picked at random from whole preamble sequences sends to the base station on RACH.
UE is according to the broadcast message of base station; Utilize the implicit information of preamble sequence transmission according to current needs, from optional preamble sequence set, select a preamble sequence at random, then; All selecting a channel arbitrarily in the RACH, send this preamble sequence again.
The transmission Timing Advance of this preamble is confirmed according to the Timing Advance algorithm.Because GT has been placed on the back of preamble, so need deduct a constant above the Timing Advance at this, i.e. GT/2 like this can be so that the data slot of preamble before and after in the RACH scope, being unlikely to interfere with.
Step 3: the detection of preamble sequence is carried out in the RACH position of distributing in the base station.This detects and is coherent detection, and the base station responds detected preamble sequence, and responsive channels is a fixed channel.The response message of base station comprises the preamble sequence, Timing Advance information of response etc., also can comprise the resource allocation information that this preamble sequence is corresponding, and certainly, described resource allocation information also can be given tacit consent to, and promptly need not send.
Step 4:UE detects the base station in response channel in a regular time length, if detected the preamble sequence of own transmission, UE just thinks own and detected by the base station so.Then, UE sends data on the corresponding ascending resource of this preamble.
Fig. 7 inserts module composition diagram partly at random for terminal and the base station that can realize preceding method of the present invention, and the composition that part is inserted at the terminal at random comprises: sequence selection module, RACH form module, sending module, base station in response detection module.Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information.RACH forms module; Be used for forming RACH according to cell broadcast information and selected preamble sequence; Preamble sequence carries the protection interval of self in the formed RACH, and preamble sequence and protection thereof are arranged in the position of the ascending time slot of TD-SCDMA frame at interval.Sending module is used for through RACH preamble sequence being sent to cell base station.The base station in response detection module is used for the base station in response channel detected and judges whether to insert successfully.
The composition that the base station is inserted part at random comprises: broadcast module, random access sequence detection module, accidental access response module, ascending time slot are provided with module, preamble sequence grouping module.Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of RACH is broadcasted through broadcast channel.The random access sequence detection module is used to detect the preamble sequence in the RACH, and said preamble sequence carries the protection interval of self.The accidental access response module is used for through responsive channels detected preamble sequence being responded.Ascending time slot is provided with module; Be used for according to coverage and said preamble sequence and the shared at interval time slot width collocating uplink time slot of protection; The purpose of this module is to make the ascending time slot number must satisfy the requirement of sending RACH length, and said setting can be set when system initialization.The preamble sequence grouping module is used for according to pairing minute set condition of each preamble sequence, like descending channel quality etc., said preamble sequence is divided into groups.Grouping itself just to client identification relevant minute set condition for information about, the implicit information that client can comprise according to dividing into groups is carried out corresponding operation.
The present invention improves the structure of RACH; Be used in combination the allocation criteria of disclosed RACH; Can avoid the influence of the interference of far end cell TS0 time slot and DwPTS time slot as much as possible to random access procedure; Thereby realize inserting at random accurately and rapidly of UE, improved the operational paradigm of whole communication system.
The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (13)
1. TDD accidental access method, mobile subscriber terminal sends preamble sequence through RACH to the sub-district when inserting at random; It is characterized in that; Comprise a white space in said RACH inside, as the protection interval of said preamble sequence, wherein; Said preamble sequence and protection are allocated in away from the middle of the up-downgoing protection ascending time slot at interval at interval; And said protection is positioned at after the said preamble sequence at interval, is close to said preamble sequence.
2. TDD accidental access method according to claim 1 is characterized in that, the span of said protection length blanking time is smaller or equal to the time that the light velocity experienced of 2 times of radius of societies apart from correspondence greater than zero.
3. according to arbitrary described TDD accidental access method in the claim 1 to 2, it is characterized in that said random access preamble sequence and protection thereof can be crossed over plural time slot at interval, its total duration obtains according to following mode:
Length (preamble sequence+protection at interval)=N*Length (TS)
Wherein, Length representes to ask for the function of time span, and N is more than or equal to 1, and smaller or equal to the positive integer of said ascending time slot number summation, TS representes single time slot.
4. TDD accidental access method according to claim 3 is characterized in that, said random access preamble sequence is the long synchronization code sequence that directly produces, or is undertaken forming after the repetition by short synchronization code sequence.
5. TDD accidental access method according to claim 4 is characterized in that, said synchronization code sequence is Zadoff-Chu sequence, GCL sequence, Colay sequence or Barker sequence.
6. TDD accidental access method according to claim 5; It is characterized in that; The Zadoff-Chu sequence of using at 521, repeats the back with this Zadoff-Chu sequence of 521 and constitutes long said preamble sequence under big coverage condition as the benchmark synchronization code sequence.
7. TDD accidental access method according to claim 6 is characterized in that, said 521 the Zadoff-Chu sequence number that constitutes said preamble sequence is the gained integer value that rounds up after radius of society removes 21.25 kilometers.
8. time division duplex terminal AM access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
RACH forms module, is used for forming RACH according to said broadcast message and selected preamble sequence;
Sending module is used for through RACH preamble sequence being sent to cell base station;
The base station in response detection module is used for the base station in response channel detected and judges whether to insert successfully;
It is characterized in that; Said RACH inside comprises a white space; Protection interval as said preamble sequence; The protection of said preamble sequence is positioned at after the said preamble sequence at interval, is close to said preamble sequence, and said preamble sequence and protection are allocated in away from the middle of the up-downgoing protection ascending time slot at interval at interval.
9. the AM access module at random of time division duplex according to claim 8 terminal is characterized in that, said random access preamble sequence and protection thereof can be crossed over plural time slot at interval, and its total duration obtains according to following mode:
Length (preamble sequence+protection at interval)=N*Length (TS)
Wherein, Length representes to ask for the function of time span, and N is more than or equal to 1, and smaller or equal to the positive integer of said ascending time slot number summation, TS representes single time slot.
10. time division duplex base station AM access module at random comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of RACH is broadcasted through broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the RACH;
The accidental access response module is used for through responsive channels detected preamble sequence being responded;
It is characterized in that; Said RACH inside comprises a white space; As the protection interval of said preamble sequence, and the protection of said preamble sequence is positioned at after the said preamble sequence at interval; Be close to said preamble sequence, said preamble sequence and protection are allocated in away from the middle of the up-downgoing protection ascending time slot at interval at interval.
11. time division duplex according to claim 10 base station AM access module at random; It is characterized in that; Said base station AM access module at random comprises that also an ascending time slot is provided with module, is used for according to coverage and said preamble sequence and the shared at interval time slot width collocating uplink time slot of protection.
12. the AM access module at random of time division duplex according to claim 11 base station is characterized in that, also comprises a preamble sequence grouping module, is used for dividing into groups according to pairing minute set condition of each preamble sequence.
13. a time division duplex random access system comprises terminal AM access module and base station AM access module at random at random, terminal AM access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
RACH forms module, is used for forming RACH according to said broadcast message and selected preamble sequence;
Sending module is used for through RACH preamble sequence being sent to cell base station;
The base station in response detection module is used for the base station in response channel detected and judges whether to insert successfully;
Base station AM access module at random comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of RACH is broadcasted through broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the RACH;
The accidental access response module is used for through responsive channels detected preamble sequence being responded;
It is characterized in that; Said RACH inside comprises a white space; Protection interval as said preamble sequence; The protection of said preamble sequence is positioned at after the said preamble sequence at interval, is close to said preamble sequence, and said preamble sequence and protection are allocated in away from the middle of the up-downgoing protection ascending time slot at interval at interval.
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| CN2007101202316A CN101369840B (en) | 2007-08-13 | 2007-08-13 | TDD accidental access method, system and its composition modules |
| PCT/CN2008/001461 WO2009021405A1 (en) | 2007-08-13 | 2008-08-13 | Method, system and apparatus for tdd random access |
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| CN101159526B (en) * | 2007-10-29 | 2014-03-19 | 中兴通讯股份有限公司 | Data transmission method |
| US8406780B2 (en) * | 2011-01-14 | 2013-03-26 | Intel Mobile Communications GmbH | LTE operation in white spaces |
| CN102938931B (en) * | 2011-08-15 | 2016-05-18 | 重庆航讯时代科技有限责任公司 | Asynchronous up-link access method and device on a large scale |
| CN102427441B (en) * | 2011-12-09 | 2014-05-14 | 浙江宏睿通信技术有限公司 | Anti-interference method applied to time-division OFDM (Orthogonal Frequency Division Multiplexing) system |
| CN105532068A (en) | 2014-07-01 | 2016-04-27 | 华为技术有限公司 | Random access method and apparatus |
| CN107872817B (en) * | 2016-09-27 | 2021-02-09 | 华为技术有限公司 | Resource allocation method, network equipment and terminal equipment |
| WO2020087497A1 (en) * | 2018-11-02 | 2020-05-07 | Qualcomm Incorporated | Implicit base station identification for remote interference management |
| CN111918405B (en) * | 2019-05-10 | 2022-12-16 | 中国移动通信有限公司研究院 | Random access method, terminal and network side equipment |
| CN114584920B (en) * | 2022-03-04 | 2023-06-27 | 北京邮电大学 | Target object access method, device, system and computer equipment |
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| WO2007012264A1 (en) * | 2005-07-25 | 2007-02-01 | Shanghai Ultimate Power Communications Technology Co., Ltd. | Transmission method for a time division duplex mobile communication system |
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| CN100566232C (en) * | 2005-08-08 | 2009-12-02 | 大唐移动通信设备有限公司 | The method of supporting changable cover by time division duplex system |
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| CN1592147A (en) * | 2003-08-27 | 2005-03-09 | 西门子公司 | Method for transmitting signal in wireless communication system |
| WO2007012264A1 (en) * | 2005-07-25 | 2007-02-01 | Shanghai Ultimate Power Communications Technology Co., Ltd. | Transmission method for a time division duplex mobile communication system |
| CN101005308A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Physical layer random access method for broad band time division duplex mobile communication system |
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