CN101369840A - 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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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
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- H—ELECTRICITY
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- 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
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, has bigger flexibility on spectrum utilization.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, wish 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 size of the radius of society that covers as required is divided into Three Estate with it usually, 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 may 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 can be by avoiding that scheduling is disturbed, and adopts other interference to avoid or cancellation.Even data block demodulation mistake also can guarantee correct reception by retransmitting.But for Random Access Channel, 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; 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 represents 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 Random Access Channel took is the resource of frequency domain, can not resemble and represent in 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, this sub-district is inserted the preamble sequence at random and has been subjected to far end cell, the ground floor sub-district outside this sub-district for example, the TS0 time slot and the interference of DwPTS time slot signal.In fact, the upstream data time slot of this sub-district UE, as TS2, TS3 etc., also be subjected to 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 by 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 the detection mistake occurred under situation about disturbing, so also can guarantee correct transmission by 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 UE sends the preamble sequence and 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 detects less than feedback signal at corresponding feedback channel, will wait for always that 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 purpose of the present invention provides a kind of distribution method of Random Access Channel, 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 by Random Access Channel to cell base station, comprise a white space, as the protection interval of described preamble sequence in described Random Access Channel inside.
Based on technique scheme, described protection is located at interval at after the described preamble sequence, is close to described preamble sequence.
Based on technique scheme, the span of described 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, described preamble sequence and protection are allocated at interval away from the middle of the up-downgoing protection ascending time slot at interval.
Based on technique scheme, described 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 represents 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 represents single time slot.
Based on technique scheme, described 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, described 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 described preamble sequence under big coverage condition as the benchmark synchronization code sequence.
Based on technique scheme, described 521 the Zadoff-Chu sequence number that constitutes described 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 a kind of time division duplex terminal access module at random, comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
Random Access Channel forms module, is used for forming Random Access Channel according to described broadcast message and selected preamble sequence;
Sending module is used for by Random Access Channel 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;
Described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
Based on technique scheme, described preamble sequence and protection are located at interval at away from the middle of the up-downgoing protection ascending time slot at interval.
Based on technique scheme, described 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 represents 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 represents single time slot.
Another object of the present invention provides a kind of time division duplex base station access module at random, comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of Random Access Channel is broadcasted by broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the Random Access Channel;
The accidental access response module is used for by responsive channels detected preamble sequence being responded;
It is characterized in that described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
Based on technique scheme, described base station access module at random comprises that also an ascending time slot is provided with module, is used for according to coverage and described 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 access module and base station access module at random at random, and terminal access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
Random Access Channel forms module, is used for forming Random Access Channel according to described broadcast message and selected preamble sequence;
Sending module is used for by Random Access Channel 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 access module at random comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of Random Access Channel is broadcasted by broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the Random Access Channel;
The accidental access response module is used for by responsive channels detected preamble sequence being responded;
Described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
Based on technique scheme, described preamble sequence and protection are located at interval at away from the middle of the up-downgoing protection ascending time slot at interval.
The present invention is directed to broad band time division duplex honey comb system, under medium covering and big coverage condition, the Random Access Channel 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 Random Access Channel 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 Random Access Channel; can avoid the interference of telepoint base station as much as possible; guarantee that this cell base station correctly detects Random Access Channel; thereby realize that terminal inserts accurately and rapidly at random, provide effective solution for ofdm system realization terminal inserts at random.
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 a Random Access Channel position distribution diagram under the 5km coverage condition;
Fig. 3 (b) is a Random Access Channel position distribution diagram under the 30km coverage condition;
Fig. 3 (c) is a Random Access Channel position distribution diagram under the 100km coverage condition;
Fig. 4 (a) is a Random Access Channel position distribution diagram under the descending time slot 5km coverage condition for TS4;
Fig. 4 (b) is a Random Access Channel position distribution diagram under the descending time slot 30km coverage condition for TS4;
Fig. 4 (c) is a Random Access Channel position distribution diagram 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 situations;
Fig. 5 (b) is under the 40km coverage condition, uses random access channel structure figure under two 521 the Zadoff-Chu sequence situations;
Fig. 5 (c) is under the 60km coverage condition, uses random access channel structure figure under three 521 the Zadoff-Chu sequence situations;
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 redesigned, under the situation that can carry out the up channel distribution, make this redesign Random Access Channel in up channel, to dispose flexibly, the moment that the transmission position of this sub-district being inserted at random the preamble sequence arrives this sub-district away from the TS0 time slot and the DwPTS time slot of telepoint base station, reduce the interference of the TS0 time slot of telepoint base station and DwPTS time slot as much as possible, thereby improve the access speed that is detected as power and UE of Random Access Channel this sub-district preamble sequence.
The present invention is for including a white space that does not send any data in Random Access Channel; 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, as shown in Figure 2 to the front and back data slot.Use this improved Random Access Channel distribution structure; Random Access Channel just needn't be limited to next-door neighbour GP and distribute; because the preamble sequence in this Random Access Channel distribution structure has the protection interval of oneself; can avoid the preamble sequence forward or when mobile 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 determines its value size by base station antenna height.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 had protection at interval with regard to the data slot before and after can not having influence on like this.
Fig. 1 (b) and Fig. 3 (b) and Fig. 3 (c) are contrasted as can be seen; in the distribution structure of the existing medium covering and the Random Access Channel 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 Random Access Channel; 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 telepoint base station TS0 time slot and DwPTS time slot arrive the moment of this sub-district, thereby avoid the interference of telepoint base station TS0 time slot and DwPTS time slot to this sub-district preamble sequence.
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 contrast figure 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 Random Access Channel 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 designed preamble of the access at random sequential structure that has the protection interval of the present invention; allocation criteria in the Random Access Channel 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.
Measure when the TS0 of concrete certain sub-district and the interference of DwPTS can be carried out initial setting up in the sub-district, the distribution of carrying out Random Access Channel according to measured value get final product, needn't measure dynamically, and measure also more complicated dynamically and relatively be difficult to survey standard.
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 may be longer, just the length of N time slot.Promptly
Length (the preamble sequence+GT)=N * Length (TS)
Length represents 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 Random Access Channel 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 described preamble sequence is:
TRUNC (the radius of society milimeter number/21.25km)
TRUNC is the function that rounds up, and when being 84km as radius of society, 84km/21.25 is about 3.953, and rounding up is 4, promptly uses 4 521 Zadoff-Chu sequence to constitute described preamble sequence when the 84km kilometer covers.When being 85km as radius of society, 85km/21.25 is 4, then uses 4 521 Zadoff-Chu sequence.When being 86km as 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 Random Access Channel the base station by broadcast channel.
Because the restriction of Random Access Channel length, the ascending time slot number of base station assigns also can be subjected to certain restriction.Unlike the prior art be, adopt disclosed technical scheme, the ascending time slot number of this moment must satisfy the requirement that sends Random Access Channel length.For medium covering, the base station will be distributed an ascending time slot at least, if Random Access Channel 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 Random Access Channel can't be distributed.In length, and the requirement of system uplink data volume according to Random Access Channel, 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 Random Access Channel.Then, broadcast the positional information of Random Access Channel and the preamble sequence of this sub-district use the base station by broadcast channel.
In TD-SCDMA, the number of a spendable preamble sequence in sub-district has been planned when plot planning, is 16 as the planning number, and then the preamble sequence broadcast that 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 as 16 sequences, promptly divide into groups 1 and the grouping 2, select the sequence in the grouping 1 so, just implicit its down channel quality is relatively good; If the sequence of selecting is arranged in grouping 2, 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 Random Access Channel.
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 Random Access Channel, send this preamble sequence again.
The transmission Timing Advance of this preamble is determined 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 Random Access Channel scope, being unlikely to interfere with.
Step 3: the detection of preamble sequence is carried out in the Random Access Channel 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 of this preamble sequence correspondence, 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 ascending resource of this preamble correspondence.
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 terminal inserts part at random comprises: sequence selection module, Random Access Channel 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.Random Access Channel forms module; be used for forming Random Access Channel according to cell broadcast information and selected preamble sequence; preamble sequence carries the protection interval of self in the formed Random Access Channel, and preamble sequence and protection thereof are located at interval at the position of the ascending time slot in the TD-SCDMA frame.Sending module is used for by Random Access Channel 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 Random Access Channel is broadcasted by broadcast channel.The random access sequence detection module is used to detect the preamble sequence in the Random Access Channel, and described preamble sequence carries the protection interval of self.The accidental access response module is used for by responsive channels detected preamble sequence being responded.Ascending time slot is provided with module; be used for according to coverage and described 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 that sends Random Access Channel length, and described 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, as descending channel quality etc., described 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 grouping is carried out corresponding operation.
The present invention improves the structure of Random Access Channel, be used in combination the allocation criteria of disclosed Random Access Channel, 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 (17)
1. TDD accidental access method; mobile subscriber terminal sends preamble sequence by Random Access Channel to cell base station when inserting at random, it is characterized in that; comprise a white space in described Random Access Channel inside, as the protection interval of described preamble sequence.
2. TDD accidental access method according to claim 1 is characterized in that described protection is located at interval at after the described preamble sequence, is close to described preamble sequence.
3. TDD accidental access method according to claim 2 is characterized in that, the span of described 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.
4. TDD accidental access method according to claim 3 is characterized in that, described preamble sequence and protection are allocated at interval away from the middle of the up-downgoing protection ascending time slot at interval.
5. according to the described TDD accidental access method of arbitrary claim in the claim 1 to 4, it is characterized in that described 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 represents 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 represents single time slot.
6. TDD accidental access method according to claim 5 is characterized in that, described 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.
7. TDD accidental access method according to claim 6 is characterized in that, described synchronization code sequence is Zadoff-Chu sequence, GCL sequence, Golay sequence or Barker sequence.
8. 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 described preamble sequence under big coverage condition as the benchmark synchronization code sequence.
9. TDD accidental access method according to claim 8 is characterized in that, described 521 the Zadoff-Chu sequence number that constitutes described preamble sequence is the gained integer value that rounds up after radius of society removes 21.25 kilometers.
10. time division duplex terminal access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
Random Access Channel forms module, is used for forming Random Access Channel according to described broadcast message and selected preamble sequence;
Sending module is used for by Random Access Channel 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 described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
11. time division duplex terminal according to claim 10 is access module at random, it is characterized in that, described preamble sequence and protection are located at interval at away from the middle of the up-downgoing protection ascending time slot at interval.
12. time division duplex terminal according to claim 11 is access module at random, it is characterized in that, described 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 represents 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 represents single time slot.
13. a time division duplex base station is access module at random, comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of Random Access Channel is broadcasted by broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the Random Access Channel;
The accidental access response module is used for by responsive channels detected preamble sequence being responded;
It is characterized in that described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
14. time division duplex as claimed in claim 13 base station is access module at random; it is characterized in that; described base station access module at random comprises that also an ascending time slot is provided with module, is used for according to coverage and described preamble sequence and the shared at interval time slot width collocating uplink time slot of protection.
15. time division duplex as claimed in claim 14 base station is access module at random, it 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.
16. a time division duplex random access system comprises terminal access module and base station access module at random at random, terminal access module at random comprises at least:
Sequence selection module is used for selecting to obtain the preamble sequence of base station broadcast information;
Random Access Channel forms module, is used for forming Random Access Channel according to described broadcast message and selected preamble sequence;
Sending module is used for by Random Access Channel 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 access module at random comprises at least:
Broadcast module is used for the spendable preamble sequence of positional information and this sub-district of Random Access Channel is broadcasted by broadcast channel;
The random access sequence detection module is used to detect the preamble sequence in the Random Access Channel;
The accidental access response module is used for by responsive channels detected preamble sequence being responded;
It is characterized in that described Random Access Channel includes a white space, as the protection interval of described preamble sequence.
17. a kind of time division duplex random access system as claimed in claim 16 is characterized in that, described preamble sequence and protection are located at interval at away from the middle of the up-downgoing protection ascending time slot at interval.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101202316A CN101369840B (en) | 2007-08-13 | 2007-08-13 | TDD accidental access method, system and its composition modules |
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| CN101369840A true CN101369840A (en) | 2009-02-18 |
| CN101369840B CN101369840B (en) | 2012-07-04 |
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| CN102427441A (en) * | 2011-12-09 | 2012-04-25 | 杭州宏睿通信技术有限公司 | Anti-interference method applied to time-division OFDM (Orthogonal Frequency Division Multiplexing) system |
| CN102938931A (en) * | 2011-08-15 | 2013-02-20 | 北京为邦远航无线技术有限公司 | Wide-range nonsynchronous uplink accessing method and device |
| CN101159526B (en) * | 2007-10-29 | 2014-03-19 | 中兴通讯股份有限公司 | Data transmission method |
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| WO2016000198A1 (en) * | 2014-07-01 | 2016-01-07 | 华为技术有限公司 | Random access method and apparatus |
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Family Cites Families (6)
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| EP1511190A1 (en) * | 2003-08-27 | 2005-03-02 | Siemens Aktiengesellschaft | Method for transmission in a TDD system with variable length guard period |
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| DK1976170T3 (en) * | 2006-01-18 | 2011-10-10 | Zte Corp | Method of Direct Access to User Equipment in a Multi-User Access Communication System with Time Multiplex Sync Code Multiplex |
-
2007
- 2007-08-13 CN CN2007101202316A patent/CN101369840B/en active Active
-
2008
- 2008-08-13 WO PCT/CN2008/001461 patent/WO2009021405A1/en active Application Filing
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| CN102938931A (en) * | 2011-08-15 | 2013-02-20 | 北京为邦远航无线技术有限公司 | Wide-range nonsynchronous uplink accessing method and device |
| 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 |
| CN102427441A (en) * | 2011-12-09 | 2012-04-25 | 杭州宏睿通信技术有限公司 | Anti-interference method applied to time-division OFDM (Orthogonal Frequency Division Multiplexing) system |
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| CN114584920A (en) * | 2022-03-04 | 2022-06-03 | 北京邮电大学 | Target object access method, device and system and computer equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101369840B (en) | 2012-07-04 |
| WO2009021405A1 (en) | 2009-02-19 |
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