CN103458528A - Contention-based random access method and contention-based random access equipment - Google Patents
Contention-based random access method and contention-based random access equipment Download PDFInfo
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- CN103458528A CN103458528A CN2012101704633A CN201210170463A CN103458528A CN 103458528 A CN103458528 A CN 103458528A CN 2012101704633 A CN2012101704633 A CN 2012101704633A CN 201210170463 A CN201210170463 A CN 201210170463A CN 103458528 A CN103458528 A CN 103458528A
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Abstract
The invention relates to the technical field of communication, and discloses a contention-based random access method and contention-based random access equipment. The contention-based random access method includes detecting a leader sequence transmitted by user equipment UE, and determining time-domain and frequency-domain locations of the leader sequence; transmitting random access response on a physical downlink shared channel (PDSCH). The frequency-domain width occupied by the leader sequence is smaller than six resource blocks RB. The random access response indicates the leader sequence used by the user equipment UE and the time-domain and frequency-domain locations of resource blocks RB occupied by the leader sequence. The contention-based random access method and the contention-based random access equipment have the advantages that the coverage of a PRACH (physical random access channel) in an LTE (long-term evolution) system can be improved, and the communication quality of edge users of cells can be guaranteed.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of accidental access method and equipment based on competition.
Background technology
3G (Third Generation) Moblie (3rd Generation, (the Long Term Evolution of Long Term Evolution 3G), LTE) technology enters into commercial stage from conceptual phase at present, in the deployment of LTE network, for cost-saving, make the deployment of network more convenient, operator wishes that the LTE network can be used identical site with existing universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS) network.In order to guarantee the communication quality of Cell Edge User, this just needs LTE network energy and UMTS network to reach identical coverage.The LTE network has been divided different channels in physical layer and has been carried different information, and the coverage of assessment LTE will be assessed respectively the covering of these channels, by relative discern, go out to cover limited channel, and then consider to strengthen the method that this channel covers.
In the prior art, the covering of each channel of assessment LTE can adopt the method for calculating maximum junction loss (Maximum Coupling Loss, MCL).MCL is defined as the link load between subscriber equipment (User Equipment, UE) antenna and base station (eNodeB) antenna, comprises the factors such as antenna gain, path loss, shadow fading.MCL is the limiting value of junction loss when service can be provided, and therefore is defined as the covering of this service.
By emulation and calculating, can draw: Physical Random Access Channel (Physical Random Access Channel, while PRACH) adopting form Format 2, although 839 long targeting sequencings have been carried out repeating sending in the hope of improving and have detected performance, but the MCL calculated is still less, therefore need to consider PRACH is carried out to coverage enhancement, but also PRACH is not carried out the effective scheme of coverage enhancement in prior art.
Summary of the invention
The present invention is directed to the problem that above-mentioned prior art exists, a kind of accidental access method and equipment based on competition is provided, to solve PRACH in the LTE system, cover limited problem.
For this reason, the invention provides following technical scheme:
A kind of accidental access method based on competition comprises:
Detect the targeting sequencing that user equipment (UE) sends, determine time domain and the frequency domain position of described targeting sequencing, wherein, the frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Send accidental access response on Physical Downlink Shared Channel PDSCH, wherein, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described UE to use and described targeting sequencing take.
A kind of accidental access method based on competition comprises:
Select targeting sequencing in random access procedure, the frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Send described targeting sequencing.
A kind of network equipment comprises:
Detecting unit, for detection of the targeting sequencing of user equipment (UE) transmission, determine time domain and the frequency domain position of described targeting sequencing; The frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Transmitting element, on Physical Downlink Shared Channel PDSCH, sending accidental access response, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described subscriber equipment to use and described targeting sequencing take.
A kind of subscriber equipment comprises:
Processing unit, select targeting sequencing for random access procedure, and the frequency domain width that described targeting sequencing takies is less than 6 RB;
Transmitting element, for sending described targeting sequencing.
Accidental access method and equipment based on competition provided by the invention, use Resource Block (Resource Block by reducing each user PRACH sequence, RB) number, the noise increased in full power transmission situation recently strengthens covering, solves LTE system PRACH and covers limited problem.And eNodeB sends to the accidental access response of UE to indicate time domain and these information of frequency domain position of targeting sequencing and the RB that described targeting sequencing takies of use, has guaranteed the random access procedure of UE, and has guaranteed the communication quality of Cell Edge User.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the present invention, for those of ordinary skills, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the Format Series Lines schematic diagram of existing PRACH;
Fig. 2 is the realization flow figure of the accidental access method of the embodiment of the present invention based on competition at network side;
Fig. 3 is the realization flow figure of the accidental access method of the embodiment of the present invention based on competition in user equipment side;
Fig. 4 is a kind of structural representation of the embodiment of the present invention network equipment;
Fig. 5 is a kind of structural representation of embodiment of the present invention subscriber equipment.
Embodiment
In order to make those skilled in the art person understand better the scheme of the embodiment of the present invention, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
Below at first the computational process of MCL in prior art is done to simple declaration.
MCL and carrier frequency are independent, when uplink and downlink transfer, are defined as respectively:
The up maximum transmit power of up MCL=-eNodeB sensitivity;
The descending maximum transmit power of descending MCL=-UE sensitivity.
MCL can assess by the link budget analysis, and computational process is as follows:
MCL=transmitted power-receiver sensitivity;
Receiver sensitivity=noise equivalent power+required signal-to-noise ratio SINR;
Noise equivalent power=thermal noise density+receiver noise index+interference margins+10log (busy channel bandwidth).
Wherein, the value of required signal-to-noise ratio (Signal to Interference plus Noise Ratio, SINR) need to obtain by the link simulation of each channel.After calculating the MCL of each channel, compare, the channel that wherein the MCL value is less is and covers limited channel.
Computational process by above-mentioned MCL can find out, when PRACH adopts full power to send, transmitted power is fixed as 23dBm, and the busy channel bandwidth is larger, and the noise equivalent power calculated is also just larger, causes the MCL calculated just less.
The resource of LTE system is divided into a plurality of symbols on time domain, is divided into subcarrier on frequency domain.A radio frames comprises 10 subframes, and a normal sub-frames comprises two time slots.The size of a RB of definition is 12 subcarriers on frequency domain, on time domain, is the length of a time slot.
The sequence that existing PRACH is used has 5 kinds of forms, and the sequence duration is T
sEQ, Cyclic Prefix (Cyclic Prefix, the CP) duration is T
cP, as shown in Figure 1.T in various forms
sEQand T
cPprovide as follows shown in table 1, stipulated the time length of field of PRACH.
Table 2:
In table 2,5,6,7,8 mean the sequence number of special subframe configuration.
On frequency domain, each PRACH sequence takies 1.08MHz, i.e. 6 RB, the width of 72 subcarriers.In Frequency Division Duplexing (FDD) (Frequency Division Duplex, FDD) situation, transmit at most a PRACH sequence in each subframe, there is no frequency division.In time division duplex (Time Division Duplex, TDD) situation, allow in a subframe to send a plurality of PRACH sequences, send at most 6, a plurality of PRACH sequences are divided at the enterprising line frequency of frequency domain.Parameter p rach-ConfigurationIndex indication PRACH by the high level configuration allows the time location, Time Density and the frequency location that send.
In the prior art, have 64 PRACH sequences in the Yi Ge community and can be used as targeting sequencing.Random access procedure has two kinds of patterns, i.e. random access and the random access based on non-competing based on competition.These 64 PRACH sequences are divided into again two parts, for the random access based on competition with for the random access based on non-competing.Network side is notified the targeting sequencing of UE for the random access based on competition (64 subtract Ncf, and wherein, Ncf is that network side is the sequence number that the random access based on non-competing retains) by broadcast channel.
When initiating the random access procedure of competition, the targeting sequencing that UE adopts is 64 to subtract one that chooses Ncf PRACH sequence from this.
The sequence length of various forms is as shown in table 2.
Table 2:
| Format Series Lines (Format) | Sequence length |
| 0–3 | 839 |
| 4 | 139 |
PRACH is used less subcarrier spacing, and the subcarrier spacing of Format Series Lines 0-3 is 1250Hz, and the subcarrier spacing of format 4 is 7500Hz.
Take the frequency domain width of 6 RB at frequency domain due to PRACH, the noise equivalent power therefore received is more, and this has just caused the MCL that PRACH is corresponding less, has affected the covering of PRACH.
By above-mentioned, existing PRACH is covered to the limited analysis of causes, the embodiment of the present invention has proposed the method and apparatus that a kind of PRACH of enhancing covers, by reducing the frequency domain width of each UE to the PRACH channel occupancy, the noise increased in full power transmission situation recently strengthens the PRACH covering.
As shown in Figure 2, be that the embodiment of the present invention strengthens the realization flow figure of the method for PRACH covering at network side, comprise the following steps:
In embodiments of the present invention, in order to strengthen PRACH, cover, the frequency domain width of targeting sequencing is reduced, such as, being reduced to by the existing frequency domain width that takies 6 RB the frequency domain width that takies 1 RB, certainly, can be also the frequency domain width of n*RB, wherein 1<n<6, do not do restriction to this embodiment of the present invention.For convenience, take frequency domain width that each targeting sequencing takies 1 RB in the description of back describes as example.
Because the design of Format Series Lines Format4 is only applicable to up special domain shorter under tdd mode, be UpPTS(Uplink Pilot Time Slot, uplink pilot time slot) zone, and be applied to the small size community, therefore when considering covering problem, can not apply Format4 and access at random.For this reason, in embodiments of the present invention, can keep subcarrier spacing consistent with the subcarrier spacing of original Format0-3, be 1250Hz.
The subcarrier spacing of considering LTE system under other channel is 15kHz, width at 1 RB of frequency domain is 12 subcarriers, therefore, the subcarrier spacing of the 1250Hz used for PRACH, 1 RB can with the frequency domain width be 144 subcarriers (they being 15000*12/1250=144).If the length of targeting sequencing is made as to 139, take 139 subcarriers (the subcarrier both sides respectively contain 2.5 subcarriers as boundary belt), a targeting sequencing time domain duration is 1/1250=0.8ms.The targeting sequencing that can be 139 by length in time domain in 1 Transmission Time Interval (Transmission Time Interval, TTI), send on 1 RB width of frequency domain in 6 RB.
In embodiments of the present invention, choosing and sending of targeting sequencing can have multiple implementation, will describe in detail in the back.
It should be noted that, in described accidental access response, can also comprise: regularly aligned instruction, subsequent message 3(Message3) the initial uplink resource of permitting transmission, one or more information in interim Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (Cell Radio Network Temporary Identifier, C-RNTI) etc.The implication of these information, with identical in prior art, does not elaborate at this.
It is also same as the prior art, roughly as follows that the user carries out the random process accessed:
In the random access procedure based on competition, UE is desirably in a time window and receives above-mentioned accidental access response after sending targeting sequencing.If UE does not receive accidental access response in the time window of setting, will retransmit targeting sequencing.
After UE receives accidental access response in the time window of setting, capable physically shared channel (the Physical Uplink Shared Channel of meeting, PUSCH) the first uplink of upper scheduling, be Message3, use mixed automatic retransfer request (Hybrid Automatic Repeat Request, HARQ) technology, transmit definite random access procedure message, as Radio Resource is controlled (Radio Resource Control, RRC) linking request, tracking area update or dispatch request etc., comprise above-mentioned interim C-RNTI and C-RNTI in Message 3, perhaps comprise above-mentioned interim C-RNTI and UE ID, the above-mentioned interim C-RNTI scrambling of Message 3 use.
In the random access based on competition, because UE selects targeting sequencing at random, thereby exist a plurality of UE to transmit the possibility of same preamble sequence simultaneously, likely the targeting sequencing conflict can occur.In this case, the UE of conflict can receive identical interim C-RNTI, thereby when sending Message 3, UE also has a conflict, the Message 3 that causes eNodeB not send the UE of conflict successfully decodes, thereby need UE to be retransmitted Message 3, after UE reaches maximum HARQ number of retransmissions, can start new random access procedure.
If eNodeB successfully decodes to the Message 3 of a UE in the UE of conflict, eNodeB sends competition to UE and solves message, in this competition, solves C-RNTI or the UE ID that in message, the transmission decoding obtains.After UE receives that competition solves message, the C-RNTI or the UE ID that detect in described competition solution message are identical with self C-RNTI or UE ID, to the eNodeB transmitting HARQ, feed back, otherwise stop current random access procedure, and start another random access procedure.
In the prior art, can carry random access leader sequence sign (Random Access Preamble Index in the above-mentioned accidental access response that eNodeB sends on PDSCH, RAPID) and random access radio network temporary mark (Random Access Radio Network Temporary Identifier, RA-RNTI), wherein:
RAPID is used to indicate the targeting sequencing that described UE is used, RAPID contains 6bit information, be used to indicate a kind of in 64 available PRACH sequences, that is to say, the RAPID in accidental access response specifically shows which in 64 PRACH sequences targeting sequencing that UE is used be.
RA-RNTI=1+t_id+10*f_id, wherein:
T_id indicates the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10.Because the resource of LTE system is divided into radio frames on time domain, a radio frames comprises 10 subframes, and sequence number is 0-9, therefore, utilizes the subframe sequence number can show the time-domain position of the targeting sequencing that eNode detects.
These 6 RB of 6 RB(that f_id indicates described targeting sequencing to take are continuous, and original position always has 6 kinds) frequency domain position.Particularly, the RB that each subframe can be able to be used is the ascending key by frequency at frequency domain, 0≤f_id<6.
Front is mentioned, and in embodiments of the present invention, each targeting sequencing can only take the frequency domain position of 1 RB, and it is consistent with the subcarrier spacing of original Format0-3 that subcarrier spacing keeps, and is 1250Hz.Time-domain position and the frequency domain position of 1 RB that the targeting sequencing that the accidental access response that eNodeB sends indicates described UE to use and described targeting sequencing take.Therefore, in order to reduce the change to existing system as far as possible, the embodiment of the present invention can be expanded existing RAPID and these two parameters of RA-RNTI, time domain and these information of frequency domain position of the RB that the targeting sequencing that can indicate above-mentioned UE to use and described targeting sequencing take, specifically multiple extended mode can be arranged, relevant to choosing with send mode of targeting sequencing, below this measure example is elaborated.
Below all take the situation that each PRACH sequence takies the frequency domain width of 1 RB and describe as example.
Embodiment mono-:
In this embodiment, adopt the targeting sequencing that length is 139.
UE can choose at random the transmission of the frequency domain width of 1 RB wherein for targeting sequencing in having 6 shared RB frequency domain width of PRACH channel now, and different UE can choose different RB frequency domain positions.In this case, before above-mentioned steps 201, eNodeB can notify the PRACH sequence of UE for the random access based on competition by broadcast channel similarly with prior art, and UE one of random selection from these PRACH sequences sends as targeting sequencing, that is to say, the targeting sequencing that UE sends can be the sequence that UE selects from the PRACH arrangement set of the random access for based on competition.In this case, UE only need send described targeting sequencing in a TTI.Correspondingly, before above-mentioned steps 201, the described targeting sequencing that the length that eNodeB reception UE sends in a TTI is 139.
Further, in order further to increase covering power, can make UE by N(N >=1) individual long be that 139 PRACH sequence sends in a continuous N TTI, this N individual long be that 139 PRACH sequence can be identical or different.In these TTI, the frequency domain position of the shared RB of PRACH sequence is fixed.That is to say, UE can send a sequence when sending the PRACH sequence in a TTI, also can in a plurality of continuous TTI, send different PRACH sequences.
It should be noted that, UE sends continuously the times N of PRACH sequence and can be determined and notify to UE by broadcast message according to covering power required under concrete application scenarios, the factors such as number of resources that take by eNodeB.For the UE of same community, the times N that sends continuously the PRACH sequence is consistent.
In actual applications, can be a kind of sequence template by above-mentioned N the continuous PRACH sequence definition sent, sequence template is comprised of a plurality of PRACH sequences for the random access based on competition.In this case, eNodeB can notify UE to be used for the sequence template of the random access based on competition by broadcast channel.It should be noted that, the N in described sequence template PRACH sequence is can be all identical, part is identical or all not identical.And UE one of random selection from these sequence template set sends as targeting sequencing.In this case, the PRACH sequence of UE in need in a plurality of continuous TTI, sending sequence template successively, the frequency domain position of the RB that a PRACH sequence in each TTI takies is identical.Correspondingly, eNodeB receives the PRACH sequence in the described sequence template that described UE sends in a plurality of continuous TTI, and the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
Based on choosing and send mode of above-mentioned these two kinds of targeting sequencings, after eNodeB successfully detects described targeting sequencing, send accidental access response to UE, time domain and the frequency domain position of the RB set that the targeting sequencing that can utilize the RA-RNTI parameter to indicate described UE to use in this accidental access response can take, the set that RB set expression 6 RB for sending targeting sequencing that UE chooses in the prior art form here; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10, the frequency domain position of the RB set that f_id indicates described targeting sequencing to take, 0≤f_id<6.Simultaneously, the frequency domain position of RB in described RB set that utilizes the RAPID parameter to indicate described targeting sequencing and described targeting sequencing to take.Particularly, suppose that each PRACH sequence takies the time domain width of 1 RB, for the first send mode, only in a TTI, send targeting sequencing, the targeting sequencing that length is 139 sends on 1 RB of 1 TTI, different UEs is chosen the displacement of different sequence and different frequency domain positions, the position of 1 RB in the prior art that the PRACH sequence that the 6bit information in the RAPID parameter indicates UE to choose and described PRACH sequence take in 6 RB; For the second send mode, the sequence frequency domain that length is 139 is in 1 fixing RB position, time domain sends N time continuously, different user is chosen different sequence templates and different frequency domain positions, the position of a RB in 6 RB that the sequence template that the 6bit information indication UE in the RAPID parameter chooses and the PRACH sequence in described sequence template take.
Embodiment bis-:
In this embodiment, adopt the targeting sequencing that length is 839.
Particularly, targeting sequencing can be divided into to 6 parts, on frequency domain, only on 1 RB position in 6 RB width, send, only send 1/6 part of targeting sequencing in TTI, send respectively the different piece of described targeting sequencing in 6 continuous TTI, the frequency domain position of the RB that the targeting sequencing in these TTI takies is identical.On time domain, the duration of 1 targeting sequencing is original 6 times.Can not be divided exactly by 6 due to 839, therefore in actual applications, can be divided into 140*5+139 by 839, the sequence length that front 5 TTI send is 140, is arranged in the centre of 144 available subcarriers of 1 RB at frequency domain, and the boundary belt of 2 subcarriers is respectively stayed on both sides; The sequence length that a rear TTI sends is 139, equally also is arranged in the centre of 144 available subcarriers of 1 RB, and the boundary belt of 2.5 subcarriers is respectively stayed on both sides.Subcarrier spacing is 1250Hz.
Certainly, the embodiment of the present invention is not limited in above-mentioned dividing mode, can also adopt other dividing mode, and targeting sequencing is divided into to 6 parts.
Like this, for the application scenarios of Format0-1, extend the duration T of PRACH
sEQfor 24576*Ts*6(Ts means minimum time quantum, 30720Ts=1ms), be about 6 TTI, 839 long targeting sequencings send 1 time in a manner described; For the application scenarios of Format2-3, extend the duration T of PRACH
sEQfor 2*24576*Ts*6, be about 12 TTI, every 6 TTI send the targeting sequencing of one time 839 length, and 839 long targeting sequencings repeat to send once.
In this embodiment, UE can be in having 6 shared RB frequency domain width of PRACH channel now, the transmission of the targeting sequencing that the frequency domain width of choosing at random 1 RB wherein is 839 for length, and different UE can choose different RB frequency domain positions.Correspondingly, before above-mentioned steps 201, eNodeB receives the described targeting sequencing that length that UE sends in a plurality of continuous TTI is 839, and wherein, the frequency domain position of the RB that the part targeting sequencing received in each TTI takies is identical.
Based on choosing and send mode of above-mentioned this targeting sequencing, after eNodeB successfully detects described targeting sequencing, send accidental access response to UE, time domain and the frequency domain position of the RB set that the targeting sequencing that can utilize the RA-RNTI parameter to indicate described UE to use in this accidental access response can take, the set that RB set expression 6 RB for sending targeting sequencing that UE chooses in the prior art form here; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10, the frequency domain position of the RB set that f_id indicates described targeting sequencing to take, 0≤f_id<6.Simultaneously, the frequency domain position of RB in described RB set that utilizes the RAPID parameter to indicate described targeting sequencing and described targeting sequencing to take.Particularly, suppose that each PRACH sequence takies the time domain width of 1 RB, the sequence that length is 839 sends on 1 RB of 6 TTI, different UEs is chosen the displacement of different sequence and different frequency domain positions, and a RB who chooses in the shift sequence that the UE that the 6bit information in the RAPID parameter is 839 by length chooses and 6 RB determines jointly.
Visible, in above-mentioned two kinds of embodiment, the RAPID parameter of the 6bit in accidental access response had both shown which sequence was the sequence that eNodeB receives be, had also shown that the sequence that eNodeB receives is which RB in 6 RB.Available sequences in the ，Yi Ge community or available sequences template will be less than 64 like this.And, in embodiment 3 below, still remain in the Yi Ge community and have 64 available sequences or 64 available sequence templates, to describing in detail in embodiment tri-below this.
Embodiment tri-:
In this embodiment, PRACH sequence or sequence template available in the Shi Yige community still remain on 64, and UE is similar to choosing with send mode and two of fronts embodiment of targeting sequencing, at this, no longer describes in detail.
From front, embodiment is different, in this embodiment, and the frequency domain position of the RB that the targeting sequencing that can not indicate UE to use by the RAPID parameter of 6bit again and described targeting sequencing take in described RB set, and the targeting sequencing that can only indicate UE to use.
Particularly, the targeting sequencing of UE transmission successfully detected at eNodeB after, send accidental access response to UE, the targeting sequencing that utilizes RAPID parameter indication UE to use, time domain and the frequency domain position of the targeting sequencing that utilizes RA-RNTI parameter indication UE to use in this accidental access response.RA-RNTI=1+t_id+10*f_id, wherein, the implication of t_id is with identical in the embodiment of two of fronts, indicate the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10, and the implication of f_id is different from the f_id in the embodiment of two of fronts, the frequency domain position of the RB set of indicating described targeting sequencing to take and the frequency domain position of the RB that described targeting sequencing takies in described RB set.Particularly, the RB that each subframe can be able to be used is the ascending key by frequency at frequency domain, when the random access leader sequence sent only takies a RB, and 0≤f_id<36.
It should be noted that, in this embodiment, can adopt equally any targeting sequencing in the embodiment of two of fronts.
In addition, it should be noted that, the various embodiments described above are applicable to FDD and TDD.During FDD, only can transmit a targeting sequencing or sequence template at every turn; During TDD, can transmit at most 6 targeting sequencings or sequence template, they are frequency division multiplexings at every turn.
The method visible, that the enhancing PRACH that the embodiment of the present invention provides covers, by reducing the number of each user PRACH sequence use RB, the noise increased in full power transmission situation recently strengthens covering, solves LTE system PRACH and covers limited problem.And time domain and these information of frequency domain position of the RB that the targeting sequencing that eNodeB sends to the accidental access response indication UE of UE to use and described targeting sequencing take, guaranteed the random access procedure of UE, and guaranteed the communication quality of Cell Edge User.
As shown in Figure 3, be the realization flow figure of the accidental access method of the embodiment of the present invention based on competition in user equipment side, comprise the following steps:
Step 301 is selected targeting sequencing in random access procedure, and the frequency domain width that described targeting sequencing takies is less than 6 RB;
Front is mentioned, and in actual applications, described targeting sequencing can be the sequence that UE selects from the Physical Random Access Channel PRACH arrangement set of the random access for based on competition, and the frequency domain width that described targeting sequencing takies is 1 RB; Described targeting sequencing can also be the sequence template that described UE selects from the sequence template set, and described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition.
For this reason, above-mentioned steps 301 can be specifically to select a sequence as described targeting sequencing from the PRACH arrangement set of the random access for based on competition, and the frequency domain width that described targeting sequencing takies is 1 RB.Correspondingly, above-mentioned steps 302 can be specifically that the length at described targeting sequencing is 139 o'clock, sends described targeting sequencing in a TTI; Length at described targeting sequencing is 839 o'clock, sends described targeting sequencing in a plurality of continuous TTI, and the frequency domain position of the RB that the part targeting sequencing sent in each TTI takies is identical.Concrete send mode can, with reference to the description of front, not repeat them here.
Perhaps, above-mentioned steps 301 can be specifically a sequence template of selecting from the sequence template set, and described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition.Correspondingly, above-mentioned steps 302 can be specifically a plurality of PRACH sequences send successively described sequence template in a plurality of continuous TTI in, and the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.Concrete send mode can, with reference to the description of front, not repeat them here.
The method visible, that the enhancing PRACH that the embodiment of the present invention provides covers, by reducing the number of each user PRACH sequence use RB, the noise increased in full power transmission situation recently strengthens covering, has solved LTE system PRACH and has covered limited problem.
Correspondingly, the embodiment of the present invention also provides a kind of network equipment, and this network equipment can be carried out the method for the enhancing PRACH covering of the above embodiment of the present invention.Shown in Fig. 4, it is a kind of structural representation of this equipment.
In this embodiment, described equipment comprises:
Detecting unit 401, the targeting sequencing sent for detection of UE, with time domain and the frequency domain position of determining described targeting sequencing; The frequency domain width that described targeting sequencing takies is less than 6 RB;
Transmitting element 402, for send accidental access response on PDSCH, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described subscriber equipment to use and described targeting sequencing take.
Wherein, described targeting sequencing is the sequence that described UE selects from the PRACH arrangement set of the random access for based on competition, and the frequency domain width that described targeting sequencing takies can be 1 RB.Correspondingly, the described network equipment also further comprises: receiving element (not shown), for receiving the described targeting sequencing that length that described UE sends in a TTI is 139; The described targeting sequencing that perhaps to receive length that described UE sends in a plurality of continuous TTI be 839, wherein, the frequency domain position of the RB that the part targeting sequencing received in each TTI takies is identical.
Described targeting sequencing can also be the sequence template that described UE selects from the sequence template set, and described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition.Correspondingly, the described network equipment also further comprises: receiving element (not shown), for receiving the PRACH sequence of the described sequence template that described UE sends in a plurality of continuous TTI, the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.In concrete application, described targeting sequencing can adopt different length, be a PRACH sequence or the sequence template that formed by a plurality of PRACH sequences, and, for the targeting sequencing of different length and pattern, UE adopts corresponding send mode, specifically can be referring to the description of front.
Correspondingly, the embodiment of the present invention network equipment is for different length, selection and the send mode of described targeting sequencing, time domain and the frequency domain position of the RB that the targeting sequencing that transmitting element 402 can adopt various ways that described accidental access response indication UE is used and described targeting sequencing take, such as: time domain and the frequency domain position of the RB set that the targeting sequencing that can utilize the RA-RNTI parameter indication UE in described accidental access response to use can take; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10; The frequency domain position of the RB set that f_id indicates described targeting sequencing to take, 0≤f_id<6; The frequency domain position of RB in described RB set that utilizes the RAPID parameter in described accidental access response to indicate described targeting sequencing and described targeting sequencing to take; Perhaps, utilize the RAPID parameter in described accidental access response to indicate described targeting sequencing; The frequency domain position of the RB that the time domain of the RB set that the targeting sequencing that utilizes the RA-RNTI parameter in described accidental access response to indicate described subscriber equipment to use can take and frequency domain position and described targeting sequencing take in described RB set; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place, 0≤t_id<10; The frequency domain position of the RB set that f_id indicates described targeting sequencing to take, the RB that each subframe can be able to be used is the ascending key by frequency at frequency domain, when the random access leader sequence sent only takies a RB, 0≤f_id<36.Description in the method that detailed process covers referring to front embodiment of the present invention enhancing PRACH, do not repeat them here.
Visible, the network equipment of the embodiment of the present invention, by reducing the number of each user's targeting sequencing use RB, the noise increased in full power transmission situation recently strengthens covering, solves LTE system PRACH and covers limited problem.And, send to the accidental access response of UE to indicate the targeting sequencing of UE use and time domain and the frequency domain position of the RB that described targeting sequencing takies, guarantee the random access procedure of UE, and guaranteed the communication quality of Cell Edge User.This network equipment can be eNodeB.
Correspondingly, the embodiment of the present invention also provides a kind of subscriber equipment, and this subscriber equipment can be carried out the method for the enhancing PRACH covering of the above embodiment of the present invention.Shown in Fig. 5, it is a kind of structural representation of this subscriber equipment.
In this embodiment, described subscriber equipment comprises:
Transmitting element 502, for sending described targeting sequencing.
Mention in front, the targeting sequencing that UE sends can adopt different length, be a PRACH sequence or the sequence template that formed by a plurality of PRACH sequences, and, for the targeting sequencing of different length and pattern, UE adopts corresponding send mode, specifically can be referring to the description of front.
The frequency domain width that the described targeting sequencing of take takies as 1 RB be example, correspondingly, in a kind of specific embodiment of subscriber equipment of the present invention, described processing unit 501 selects a sequence as described targeting sequencing specifically for the PRACH arrangement set of the random access from for based on competition; Described transmitting element 502 is 139 o'clock specifically for the length at described targeting sequencing, sends described targeting sequencing in a TTI; Length at described targeting sequencing is 839 o'clock, sends described targeting sequencing in a plurality of continuous TTI, and the frequency domain position of the RB that the part targeting sequencing sent in each TTI takies is identical.
In a kind of specific embodiment of subscriber equipment of the present invention, the sequence template of described processing unit 501 specifically for selecting from the sequence template set, described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition; Described transmitting element 502 is specifically for the PRACH sequence send successively described sequence template in a plurality of continuous TTI in, and the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
For the PRACH sequence of different length or the sequence template be comprised of a plurality of PRACH sequences, described transmitting element 502 can, referring to the description in the method for front embodiment of the present invention enhancing PRACH covering, not repeat them here the detailed process of its transmission.
The subscriber equipment that the embodiment of the present invention provides, use and take the targeting sequencing that the frequency domain width is less than 6 RB, and the noise increased in full power transmission situation recently strengthens covering, solves LTE system PRACH and cover limited problem.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and between each embodiment, identical similar part is mutually referring to getting final product, and each embodiment stresses is the difference with other embodiment.Especially, for apparatus embodiments, due to it, substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method.Apparatus embodiments described above is only schematic, the wherein said unit as the separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed on a plurality of network element.Can select according to the actual needs some or all of module wherein to realize the purpose of the present embodiment scheme.Those of ordinary skills in the situation that do not pay creative work, can understand and implement.
Above the embodiment of the present invention is described in detail, has applied embodiment herein the present invention is set forth, the explanation of above embodiment is just for helping to understand method and apparatus of the present invention; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention simultaneously.
Claims (16)
1. the accidental access method based on competition, is characterized in that, comprising:
Detect the targeting sequencing that user equipment (UE) sends, determine time domain and the frequency domain position of described targeting sequencing, wherein, the frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Send accidental access response on Physical Downlink Shared Channel PDSCH, wherein, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described UE to use and described targeting sequencing take.
2. method according to claim 1, it is characterized in that, described targeting sequencing is the sequence that described UE selects from the Physical Random Access Channel PRACH arrangement set of the random access for based on competition, and the frequency domain width that described targeting sequencing takies is 1 RB;
Described method also comprises:
The described targeting sequencing that to receive length that described UE sends in a Transmission Time Interval TTI be 139; Perhaps
The described targeting sequencing that to receive length that described UE sends in a plurality of continuous TTI be 839, wherein, the frequency domain position of the RB that the part targeting sequencing received in each TTI takies is identical.
3. method according to claim 1, is characterized in that, described targeting sequencing is the sequence template that described UE selects from the sequence template set, and described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition;
Described method also comprises:
Receive the PRACH sequence in the described sequence template that described UE sends in a plurality of continuous TTI, the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
4. according to the described method of claims 1 to 3 any one, it is characterized in that, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described UE to use and described targeting sequencing take comprise:
Time domain and the frequency domain position of the RB set that the targeting sequencing that utilizes the random access radio network temporary mark RA-RNTI parameter in described accidental access response to indicate described subscriber equipment to use can take;
The frequency domain position of RB in described RB set that utilizes the random access leader sequence identifier RAPID parameter in described accidental access response to indicate described targeting sequencing and described targeting sequencing to take.
5. according to the described method of claims 1 to 3 any one, it is characterized in that, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described UE to use and described targeting sequencing take comprise:
Utilize the RAPID parameter in described accidental access response to indicate described targeting sequencing;
The time-frequency position of the RB set that the targeting sequencing that utilizes the RA-RNTI parameter in described accidental access response to indicate described subscriber equipment to use can take and the frequency domain position of the RB that described targeting sequencing takies in described RB set; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place; The frequency domain position of the RB set that f_id indicates described targeting sequencing to take and the frequency domain position of the RB that described targeting sequencing takies in described RB set.
6. the accidental access method based on competition, is characterized in that, comprising:
Select targeting sequencing in random access procedure, the frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Send described targeting sequencing.
7. method according to claim 6, is characterized in that,
The described targeting sequencing of selecting in random access procedure comprises:
From the Physical Random Access Channel PRACH arrangement set of the random access for based on competition, select a sequence as described targeting sequencing, the frequency domain width that described targeting sequencing takies is 1 RB;
The described targeting sequencing of described transmission comprises:
Length at described targeting sequencing is 139 o'clock, sends described targeting sequencing in a Transmission Time Interval TTI; Length at described targeting sequencing is 839 o'clock, sends described targeting sequencing in a plurality of continuous TTI, and the frequency domain position of the RB that the part targeting sequencing sent in each TTI takies is identical.
8. method according to claim 6, is characterized in that,
The described targeting sequencing of selecting in random access procedure comprises:
A sequence template of selecting from the sequence template set, described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition;
The described targeting sequencing of described transmission comprises:
A plurality of PRACH sequences send successively described sequence template in a plurality of continuous TTI in, the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
9. a network equipment, is characterized in that, comprising:
Detecting unit, for detection of the targeting sequencing of user equipment (UE) transmission, determine time domain and the frequency domain position of described targeting sequencing; The frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Transmitting element, on Physical Downlink Shared Channel PDSCH, sending accidental access response, time domain and the frequency domain position of the RB that the targeting sequencing that described accidental access response indicates described subscriber equipment to use and described targeting sequencing take.
10. the network equipment according to claim 9, it is characterized in that, described targeting sequencing is the sequence that described UE selects from the Physical Random Access Channel PRACH arrangement set of the random access for based on competition, and the frequency domain width that described targeting sequencing takies is 1 RB; The described network equipment also comprises:
Receiving element, for receiving the described targeting sequencing that length that described UE sends in a Transmission Time Interval TTI is 139; The described targeting sequencing that perhaps to receive length that described UE sends in a plurality of continuous TTI be 839, wherein, the frequency domain position of the RB that the part targeting sequencing received in each TTI takies is identical.
11. the network equipment according to claim 9, is characterized in that, described targeting sequencing is the sequence template that described UE selects from the sequence template set, and described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition; The described network equipment also comprises:
Receiving element, for receiving the PRACH sequence of the described sequence template that described UE sends in a plurality of continuous TTI, the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
12. according to the described network equipment of claim 9 to 11 any one, it is characterized in that,
Time domain and the frequency domain position of the RB set that the targeting sequencing that described transmitting element utilizes the RA-RNTI parameter in described accidental access response to indicate described subscriber equipment to use can take; The frequency domain position of RB in described RB set that utilizes the RAPID parameter in described accidental access response to indicate described targeting sequencing and described targeting sequencing to take.
13. according to the described network equipment of claim 9 to 11 any one, it is characterized in that,
Described transmitting element utilizes the RAPID parameter in described accidental access response to indicate described targeting sequencing; The frequency domain position of the RB that the time domain of the RB set that the targeting sequencing that utilizes the RA-RNTI parameter in described accidental access response to indicate described subscriber equipment to use can take and frequency domain position and described targeting sequencing take in described RB set; RA-RNTI=1+t_id+10*f_id, wherein, t_id indicates the sequence number of first subframe at described targeting sequencing place; The frequency domain position of the RB set that f_id indicates described targeting sequencing to take and the frequency domain position of the RB that described targeting sequencing takies in described RB set.
14. a subscriber equipment, is characterized in that, comprising:
Processing unit, select targeting sequencing for random access procedure, and the frequency domain width that described targeting sequencing takies is less than 6 Resource Block RB;
Transmitting element, for sending described targeting sequencing.
15. subscriber equipment according to claim 14, is characterized in that,
Described processing unit, select a sequence as described targeting sequencing specifically for the Physical Random Access Channel PRACH arrangement set of the random access from for based on competition, and the frequency domain width that described targeting sequencing takies is 1 RB;
Described transmitting element, be 139 o'clock specifically for the length at described targeting sequencing, sends described targeting sequencing in a Transmission Time Interval TTI; Length at described targeting sequencing is 839 o'clock, sends described targeting sequencing in a plurality of continuous TTI, and the frequency domain position of the RB that the part targeting sequencing sent in each TTI takies is identical.
16. subscriber equipment according to claim 14, is characterized in that,
Described processing unit, specifically for a sequence template of selecting from the sequence template set, described sequence template is comprised of a plurality of PRACH sequences for the random access based on competition;
Described transmitting element, specifically for a plurality of PRACH sequences send successively described sequence template in a plurality of continuous TTI in, the frequency domain position of the RB that the PRACH sequence sent in each TTI takies is identical.
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