CN101478824B - Method and base station for identifying downlink component carrier in random access process - Google Patents

Method and base station for identifying downlink component carrier in random access process Download PDF

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CN101478824B
CN101478824B CN200910009897.3A CN200910009897A CN101478824B CN 101478824 B CN101478824 B CN 101478824B CN 200910009897 A CN200910009897 A CN 200910009897A CN 101478824 B CN101478824 B CN 101478824B
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downlink component
random access
component carrier
carrier wave
base station
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CN101478824A (en
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朱鹏
郝鹏
喻斌
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ZTE Corp
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ZTE Corp
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Abstract

The invention provides a method for marking downward ponderance carrier wave in a random access process, which comprises that: after receiving a random access precursor transmitted by a terminal, a base station transmits a random access response corresponded with the random access precursor, and on all the transmitted downward ponderance carrier wave corresponded with the random access response, different channel resource allocation information is carried in the random access response transmitted on different downward ponderance carrier waves; after receiving a first dispatching uplink Msg. 3, the base station determines the downward ponderance carrier wave synchronous with the terminal based on resource of physical upward shared channel taken up by the Msg. 3. The invention also provides a base station for marking the downward ponderance carrier wave in the random access process. The method for marking downward ponderance carrier wave in a random access process marks the downward ponderance carrier wave by means of channel resource allocating information of the random access response and implicitly transmits the marking by means of resource of the Msg.3, thus enables the base station to determine the downward ponderance carrier wave synchronous with the terminal.

Description

Method and the base station of downlink component carrier is identified in a kind of random access procedure
Technical field
The present invention relates to moving communicating field, particularly a kind of method and base station identifying downlink component carrier in lte-a system random access procedure.
Background technology
Stochastic accessing (Random Access) be terminal start with network service before a kind of access procedure.As shown in Figure 1, LTE (Long Term Evolution, Long Term Evolution) random access procedure of system is first upper to base station transmission random access guiding (random access preamble) at Physical Random Access Channel (Physical Random Access Channel is called for short PRACH) by terminal.After base station receives the random access guiding that terminal sends, utilize the sequence wherein comprised, calculate Timing Advance, and the channel resource being used for next step transmission to this terminal distribution (is called uplink scheduling authorization, UL grant) and interim C-RNTI (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI number).Random access guiding identification number (Random Access Preamble Identifier), Timing Advance, signal channel resource allocation information and interim C-RNTI etc. send to this terminal through Physical Downlink Shared Channel, are called accidental access response (random access response).Terminal is after receiving accidental access response, according to row shared channel (the Physical Uplink Shared Channel physically of the signal channel resource allocation information UL grant in accidental access response, be abbreviated as PUSCH) on send scheduling of upstream transmissions (First scheduled UL transmission first, be abbreviated as scheduled transmission, be also called Message 3, be abbreviated as Msg.3), and according to the interim C-RNTI in accidental access response to Msg.3 scrambling.Msg.3 includes different information according to the event difference triggering this random access procedure, comprises such as RRC connection request (RRC Connection Request), C-RNTI of terminal etc.Base station to receive after Msg.3 by the contention resolved (Contention Resolution) of its content feed Stochastic accessing to terminal, is called Message 4, is abbreviated as Msg.4.
Resourse Distribute in LTE system is with Physical Resource Block (Physical Resource Block, PRB, or referred to as Resource Block, Resource Block) be unit, a PRB accounts for 12 subcarrier (subcarrier on frequency domain, or be called Resource Element, referred to as RE, each subcarrier is 15kHz), time domain accounts for a time slot, namely in time domain, occupy 7 conventional cyclic prefix (Normal cyclicprefix, referred to as Normal CP) or 6 extended cyclic prefix (Extended cyclic prefix, Extended CP) SC-FDMA symbol.If the PRB of up-link bandwidth correspondence on frequency domain adds up to N rB uL, then the index n of PRB pRBbe 0,1 ..., N rB uLthe index k of-1, RE is 0,1 ..., N rB uLn sC rB-1, wherein, N sC rBbe the sub-carrier number of a PRB corresponding on frequency domain.Then
For conventional cyclic prefix, the structure of PRB as shown in Figure 2.
In LTE system, Physical Random Access Channel configuration parameter includes, but is not limited to the configuration index of (1) Physical Random Access Channel; (2) frequency domain initial position of Physical Random Access Channel; (3) the logic index of Article 1 root sequence that uses of Physical Random Access Channel; (4) sequence cyclic shift amount; (5) cyclic shift restriction mark.Introduce the implication of these parameters below respectively.
In LTE system, Physical Random Access Channel uses the cyclically shifted sequences of Zadoff-Chu (being called for short ZC) sequence as leading (preamble), these ZC sequences are also called root sequence, these cyclically shifted sequences are also called zero correlation region (Zero Correlation Zone is called for short ZCZ) sequence.First carry out down-going synchronous after starting up of terminal, start afterwards to detect broadcast channel.Base station is by the logic index of the operable Article 1 ZC sequence of this cellular PRACH of broadcast channel notification terminal channel and the step-length (i.e. cyclic shift amount) of cyclic shift, terminal obtains the physics index of this sequence from Article 1 root sequential logic index according to certain mapping ruler, then generate available ZCZ sequence according to cyclic shift amount and certain " cyclic shift restriction rule ".It is enable that these cyclic shift restriction rules limit mark by cyclic shift.If the quantity of ZCZ sequence is less than threshold T (in LTE system, T=64), then terminal automatic increasing sequence logic index, next ZC sequence is utilized to continue to generate ZCZ sequence, until the sum of ZCZ sequence is more than or equal to above-mentioned threshold value.Finally, terminal Stochastic choice one in the available ZCZ sequence of all generations sends as random access guiding (hereinafter referred to as leading).
In LTE system, the index n of first Physical Resource Block (PRB) of PRACH channel shared by frequency domain pRBoffset rA(i.e. the frequency domain initial position of PRACH), by signaling by base station notification terminal, span is 0 ≤ n PRBoffset RA ≤ N RB UL - 6 .
In LTE system, the configuration index of Physical Random Access Channel has 64 kinds.The configuration of fdd mode is different from the configuration of tdd mode, as shown in Table 1 and Table 2.
The configuration of table 1FDD pattern Physical Random Access Channel
PRACH Configura tion Index Preambl e Format System frame number Subfram e number PRACH Configu ration Index Preambl e Format System frame number Subfram e number
0 0 Even 1 32 2 Even 1
1 0 Even 4 33 2 Even 4
2 0 Even 7 34 2 Even 7
3 0 Any 1 35 2 Any 1
4 0 Any 4 36 2 Any 4
5 0 Any 7 37 2 Any 7
6 0 Any 1，6 38 2 Any 1，6
7 0 Any 2，7 39 2 Any 2，7
8 0 Any 3，8 40 2 Any 3，8
9 0 Any 1，4，7 41 2 Any 1，4，7
10 0 Any 2，5，8 42 2 Any 2，5，8
11 0 Any 3，6，9 43 2 Any 3，6，9
12 0 Any 0，2，4，6， 8 44 2 Any 0，2，4，6， 8
13 0 Any 1，3，5，7， 9 45 2 Any 1，3，5，7， 9
14 0 Any 0，1，2，3， 4，5，6，7， 8，9 46 N/A N/A N/A
15 0 Even 9 47 2 Even 9
16 1 Even 1 48 3 Even 1
17 1 Even 4 49 3 Even 4
18 1 Even 7 50 3 Even 7
19 1 Any 1 51 3 Any 1
20 1 Any 4 52 3 Any 4
21 1 Any 7 53 3 Any 7
22 1 Any 1，6 54 3 Any 1，6
23 1 Any 2，7 55 3 Any 2，7
24 1 Any 3，8 56 3 Any 3，8
25 1 Any 1，4，7 57 3 Any 1，4，7
26 1 Any 2，5，8 58 3 Any 2，5，8
27 1 Any 3，6，9 59 3 Any 3，6，9
28 1 Any 0，2，4，6， 8 60 N/A N/A N/A
29 1 Any 1，3，5，7， 9 61 N/A N/A N/A
30 N/A N/A N/A 62 N/A N/A N/A
31 1 Even 9 63 3 Even 9
The configuration of table 1TDD pattern Physical Random Access Channel
PRACH conf. Index Preamble Format Density Per 10ms (D RA) Version (r RA) PRACH conf. Index Preamble Format Density Per 10ms (D RA) Version (r RA)
0 0 0.5 0 32 2 0.5 2
1 0 0.5 1 33 2 1 0
2 0 0.5 2 34 2 1 1
3 0 1 0 35 2 2 0
4 0 1 1 36 2 3 0
5 0 1 2 37 2 4 0
6 0 2 0 38 2 5 0
7 0 2 1 39 2 6 0
8 0 2 2 40 3 0.5 0
9 0 3 0 41 3 0.5 1
10 0 3 1 42 3 0.5 2
11 0 3 2 43 3 1 0
12 0 4 0 44 3 1 1
13 0 4 1 45 3 2 0
14 0 4 2 46 3 3 0
15 0 5 0 47 3 4 0
16 0 5 1 48 4 0.5 0
17 0 5 2 49 4 0.5 1
18 0 6 0 50 4 0.5 2
19 0 6 1 51 4 1 0
20 1 0.5 0 52 4 1 1
21 1 0.5 1 53 4 2 0
22 1 0.5 2 54 4 3 0
23 1 1 0 55 4 4 0
24 1 1 1 56 4 5 0
25 1 2 0 57 4 6 0
26 1 3 0 58 N/A N/A N/A
27 1 4 0 59 N/A N/A N/A
28 1 5 0 60 N/A N/A N/A
29 1 6 0 61 N/A N/A N/A
30 2 0.5 0 62 N/A N/A N/A
31 2 0.5 1 63 N/A N/A N/A
In LTE random access procedure, terminal physically row shared channel PUSCH sends scheduling of upstream transmissions Msg.3 first.LTE system supports the resource mapping method of centralized (Localized) in the transmission of PUSCH, and namely system assignment is one group of continuous print Physical Resource Block to the uplink transmission resource of a terminal.Support that ascending frequency-hopping is launched simultaneously, comprise in subframe and frequency hopping between subframe.In the accidental access response of LTE system, include the signal channel resource allocation information sending scheduling of upstream transmissions Msg.3 first for terminal on PUSCH, be called uplink scheduling authorization (UL grant, 20bits).Resource block assignments information (Fixed size resource block assignment, 10bits) and the enable mark of ascending frequency-hopping (Hopping flag, 1bit) is included again in UL grant, and other signal channel resource allocation informations.Terminal, after receiving accidental access response, according to the resource block assignments information in certain rule parsing UL grant, obtains resource indicatrix (Resource Indication Value, RIV).Resource indicatrix is corresponding one group of continuous print virtual resource blocks (Virtual Resource Block, VRB), specifically indicates the position RB of wherein initial fictive Resource Block sTARTwith the length L of this group virtual resource blocks cRBs.The size of a virtual resource blocks equals a Physical Resource Block.The index of Physical Resource Block PRB is n pRB, the index of virtual resource blocks VRB is n vRB.
Be designated 0 when 1bit frequency hopping is enable, when namely ascending frequency-hopping is not enable, the one group of virtual resource blocks indicated in UL grant maps directly on one group of continuous physical Resource Block in corresponding subframe first time slot; And in second time slot of this subframe, also distribute one group of continuous physical Resource Block of same position.Namely respectively in two time slots of a subframe, n pRB=n vRB.Two groups of Resource Block are for transmitting Msg.3.
Be designated 1 when 1bit frequency hopping is enable, when namely ascending frequency-hopping is enable, the one group of virtual resource blocks indicated in UL grant is mapped on one group of continuous physical Resource Block in corresponding subframe first time slot according to certain rule; And in second time slot of this subframe, according to certain frequency hopping rule, also distribute one group of continuous physical Resource Block.I.e. n pRB(n s)=f (n vRB, n s), wherein n sit is the time-gap number in a radio frames.Two groups of Resource Block are for transmitting Msg.3.
In a word, the virtual resource blocks of resource block assignments information instruction in UL grant, according to certain resource block mapping rule, is mapped on corresponding Physical Resource Block, to transmit Msg.3 by terminal.
LTE-Advanced system (abbreviation lte-a system) is the evolution system of future generation of LTE system.As shown in Figure 3, lte-a system adopts carrier aggregation (carrier aggregation) technological expansion transmission bandwidth, and the carrier wave of each gathering is called one " component carrier " (component carrier).Component carrier can be continuous print on frequency spectrum, also can be discrete.As shown in Figure 4, the downstream transmission bandwidth of lte-a system is formed by multiple downlink component carrier gathering; Uplink bandwidth only may comprise a upstream components carrier wave, also may be formed by multiple upstream components carrier aggregation.Namely system uplink and downlink bandwidth may comprise the component carrier of different number.Even if the number of system uplink and downlink component carrier is identical, for certain terminal, the component carrier number that its downlink reception bandwidth comprises also may be different with the wide component carrier number comprised of up transmit band.The situation that uplink and downlink component carrier number does not wait is called asymmetric carrier aggregation.
For backward compatibility LTE on single component carrier, lte-a system sends synchronizing signal (Synchronization Signal) and broadcast channel (Broadcast Channel, BCH) on downlink component carrier as much as possible.The information of broadcast channel broadcasts has multiple, wherein can comprise the frequency of (1) upstream components carrier wave and the bandwidth of this upstream components carrier wave; (2) configuration parameter of the Physical Random Access Channel that above-mentioned upstream components carrier wave is corresponding.
In the random access procedure of lte-a system, first terminal utilizes the synchronizing signal on downlink component carrier to complete down-going synchronous.Then, this downlink component carrier receives broadcast channel, obtain having the frequency of the upstream components carrier wave of Physical Random Access Channel, bandwidth and corresponding Physical Random Access Channel configuration parameter corresponding to this downlink component carrier.Then, terminal has on the upstream components carrier wave of Physical Random Access Channel at this and sends physical accidental access lead, carries out uplink synchronous.Base station is detected the random access guiding received, and sends accidental access response afterwards to terminal.Terminal sends scheduling of upstream transmissions Msg.3 first according to the information in accidental access response.Base station is feedback contention-based solution Msg.4 after receiving Msg.3, and whole random access procedure terminates.
In lte-a system, one has the corresponding multiple downlink component carrier of the upstream components carrier wave of Physical Random Access Channel possibility, and what namely the broadcast channel of multiple downlink component carrier notified has the upstream components carrier wave of Physical Random Access Channel identical, as shown in Figure 4.In the random access procedure, when base station detects the random access guiding sent on this upstream components carrier wave, base station cannot determine the terminal synchronizes sending this signal is on which downlink component carrier.So base station needs to repeat to send accidental access response on the downlink component carrier of all correspondences.In like manner, when base station detects the Msg.3 sent on this upstream components carrier wave, base station cannot determine the terminal synchronizes sending this signal is on which downlink component carrier.So base station needs to repeat to send contention resolved Msg.4 on the downlink component carrier of all correspondences.If after random access procedure terminates, the downlink component carrier that this terminal is synchronous still cannot be determined in base station, and follow-up downstream signal and/or downlink signaling may also need to repeat to send on multiple downlink component carrier.This all causes the waste of system resource.
Therefore, in lte-a system, how to determine terminal synchronizes becomes a problem demanding prompt solution on which downlink component carrier.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method and a kind of base station that identify downlink component carrier in a kind of random access procedure, when the corresponding upstream components carrier wave of multiple downlink component carrier, the downlink component carrier that terminal is synchronous is determined by mark, avoid repeating to send contention resolved on multiple downlink component carrier, waste system resource.
In order to solve the problems of the technologies described above, the invention provides a kind of method identifying downlink component carrier in random access procedure, comprising:
After base station receives the random access guiding of terminal transmission, send the accidental access response that this random access guiding is corresponding, on all downlink component carriers sending described accidental access response, in the accidental access response that different downlink component carriers sends, carry different signal channel resource allocation informations;
After described base station receives the Msg.3 of scheduling of upstream transmissions first that terminal physically row shared channel sends, the resource of the described Physical Uplink Shared Channel shared by this Msg.3, determines the downlink component carrier that described terminal is synchronous.
Further, said method also can have following characteristics, and described base station only sends the contention resolved Msg.4 corresponding with described Msg.3 on the downlink component carrier that described terminal is synchronous.
Further, said method also can have following characteristics, and described signal channel resource allocation information refers to that base station assigns is to the positional information of one of terminal group of Resource Block and/or quantity information, and this group Resource Block is continuous print or discrete.
Further, said method also can have following characteristics, described in carry different signal channel resource allocation informations and refer to that the position of the Resource Block distributed for the Physical Uplink Shared Channel for transmitting Msg.3 carried in the accidental access response that different downlink component carrier sends is completely different or only overlap.
Further, said method also can have following characteristics, when N number of downlink component carrier corresponds to 1 upstream components carrier wave, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, if base station receives described random access guiding on described upstream components carrier wave, N number of downlink component carrier that this upstream components carrier wave is corresponding sends accidental access response corresponding to this random access guiding.
Further, said method also can have following characteristics, corresponding 1 the upstream components carrier wave of N number of downlink component carrier, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, and wherein M downlink component carrier is notified of the configuration index of the Physical Random Access Channel on identical described upstream components carrier wave, frequency domain initial position and Article 1 can use the logic index of root sequence, base station receives the described random access guiding that terminal sends on this upstream components carrier wave, this M downlink component carrier sends accidental access response corresponding to this random access guiding.
The present invention also proposes a kind of base station, described base station, for the random access guiding that receiving terminal sends, send the accidental access response that this random access guiding is corresponding, on all downlink component carriers sending described accidental access response, in the accidental access response that different downlink component carriers sends, carry different signal channel resource allocation informations;
The Msg.3 of scheduling of upstream transmissions first that described base station also sends on receiving terminal physically row shared channel, the resource of the described Physical Uplink Shared Channel shared by this Msg.3, determines the downlink component carrier that described terminal is synchronous.
Further, above-mentioned base station also can have following characteristics, and described base station only sends the contention resolved Msg.4 corresponding with described Msg.3 on the downlink component carrier that described terminal is synchronous.
Further, above-mentioned base station also can have following characteristics, and described signal channel resource allocation information refers to that base station assigns is to the positional information of one of terminal group of Resource Block and/or quantity information, and this group Resource Block is continuous print or discrete.
Further, above-mentioned base station also can have following characteristics, described in carry different signal channel resource allocation informations and refer to that the position of the Resource Block distributed for the described Physical Uplink Shared Channel for transmitting Msg.3 carried in the accidental access response that different downlink component carrier sends is completely different or only overlap.
Further, above-mentioned base station also can have following characteristics, when N number of downlink component carrier corresponds to 1 upstream components carrier wave, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, if base station receives described random access guiding on described upstream components carrier wave, N number of downlink component carrier that this upstream components carrier wave is corresponding sends accidental access response corresponding to this random access guiding.
Further, above-mentioned base station also can have following characteristics, corresponding 1 the upstream components carrier wave of N number of downlink component carrier, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, and wherein M downlink component carrier is notified of the configuration index of the Physical Random Access Channel on identical described upstream components carrier wave, frequency domain initial position and Article 1 can use the logic index of root sequence, base station receives the described random access guiding that terminal sends on this upstream components carrier wave, this M downlink component carrier sends accidental access response corresponding to this random access guiding.
The present invention utilizes the signal channel resource allocation information in accidental access response to identify downlink component carrier, and utilize that the resource mapping of scheduling of upstream transmissions Msg.3 is first implicit delivers this mark, system is made to determine this terminal synchronizes on which downlink component carrier, avoid and repeat to send contention resolved Msg.4 on multiple downlink component carrier, avoid follow-up repetition on multiple downlink component carrier and send downstream signal and/or downlink signaling.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is LTE system random access procedure schematic diagram;
Fig. 2 is the Physical Resource Block structural representation (for conventional cyclic prefix) of LTE system
Fig. 3 is lte-a system carrier aggregation schematic diagram;
Fig. 4 is the corresponding upstream components carrier wave schematic diagram of the multiple downlink component carrier of lte-a system;
Fig. 5 is identification method of downlink component carrier wave flow chart of the present invention;
Fig. 6 is identification method of downlink component carrier wave embodiment one (1) schematic diagram of the present invention;
Fig. 7 is identification method of downlink component carrier wave embodiment one (2) schematic diagram of the present invention;
Fig. 8 is identification method of downlink component carrier wave embodiment two (1) schematic diagram of the present invention;
Fig. 9 is identification method of downlink component carrier wave embodiment two (2) schematic diagram of the present invention;
Figure 10 is identification method of downlink component carrier wave embodiment three (1) schematic diagram of the present invention;
Figure 11 is identification method of downlink component carrier wave embodiment three (2) schematic diagram of the present invention;
Figure 12 is identification method of downlink component carrier wave embodiment four (1) schematic diagram of the present invention;
Figure 13 is identification method of downlink component carrier wave embodiment four (2) schematic diagram of the present invention.
Embodiment
The present invention is described in detail below in conjunction with embodiment and accompanying drawing.
The present invention proposes a kind of method identifying downlink component carrier in lte-a system accidental access response, as shown in Figure 5, comprising:
Step 510, base station receives random access guiding, sends accidental access response, and on all downlink component carriers sending described accidental access response, the signal channel resource allocation information carried in the accidental access response that different downlink component carriers sends is different.
Scene one:
Suppose in a lte-a system, have corresponding 1 the upstream components carrier wave of N number of downlink component carrier, namely in this N number of downlink component carrier, the broadcast channel of each downlink component carrier is notified of frequency positional information and the bandwidth thereof of same upstream components carrier wave.The value of N can be 1,2,3,4 or 5.
If N > 1, when there being user equipment downlink synchronously in one of them of this N number of downlink component carrier, terminal sends random access guiding according to the system information on the broadcast channel received.Base station according to the random access guiding received, cannot determine this terminal synchronizes this N number of downlink component carrier which on.Then base station all sends accidental access response on all N number of downlink component carriers.
Scene two:
Suppose in a lte-a system, have corresponding 1 the upstream components carrier wave of N number of downlink component carrier, namely in this N number of downlink component carrier, the broadcast channel of each downlink component carrier is notified of frequency positional information and the bandwidth thereof of same upstream components carrier wave.The value of N can be 1,2,3,4 or 5.
The Physical Random Access Channel configuration parameter that the broadcast channel of downlink component carrier notifies comprises the formulatory indices of Physical Random Access Channel, frequency domain initial position, the Article 1 of Physical Random Access Channel can use the logic index of root sequence, cyclic shift amount and cyclic shift restriction mark.In this N number of downlink component carrier, suppose to have on the broadcast channel of M downlink component carrier and be notified of one group of identical Physical Random Access Channel configuration parameter.This group parameter includes, but is not limited to the formulatory indices of Physical Random Access Channel, and frequency domain initial position, and the Article 1 of Physical Random Access Channel can use the logic index of root sequence.The value of 1≤M < N, M can be 1,2,3,4.
If M > 1, when there being terminal synchronizes in one of them of this M downlink component carrier, terminal sends random access guiding according to the system information on the broadcast channel received.Base station according to the random access guiding received, cannot determine this terminal synchronizes this M downlink component carrier which on.Then base station all sends accidental access response on all M downlink component carrier.
Different signal channel resource allocation informations is carried in the accidental access response that base station sends in this N number of (scene one) or M (scene two) downlink component carrier on the basis of above two kinds of scenes.Signal channel resource allocation information refers to that base station assigns transmits positional information and/or the quantity information of one group of Resource Block of scheduling of upstream transmissions Msg.3 first on next step physically row shared channel to terminal, and this group Resource Block is continuous print or discrete.
Further, different downlink component carriers carries in the accidental access response sent different signal channel resource allocation informations and refers to that the positional information of the Resource Block carried is different, the positional information difference of described Resource Block refers to that the position of the Resource Block for the Physical Uplink Shared Channel distribution for transmitting Msg.3 carried in the accidental access response that different downlink component carriers sends is completely different or only overlap.
Step 520, terminal, according to the signal channel resource allocation information in accidental access response, according to certain resource block mapping rule, the Physical Resource Block of the Physical Uplink Shared Channel of correspondence sends Msg.3.
Step 530, base station receives Msg.3, and the resource of the Physical Uplink Shared Channel shared by the Msg.3 received, determines the downlink component carrier that terminal is synchronous.
Further, base station only sends the contention resolved Msg.4 corresponding with described Msg.3 on this downlink component carrier.
Blind Detecting is carried out in base station in distributed N group (scene one) or M group (scene two) Resource Block, and last solution recalls Msg.3.The resource (i.e. the Physical Resource Block position at place) of the Physical Uplink Shared Channel of base station shared by the Msg.3 received, can judge this terminal synchronizes is on which downlink component carrier, and on this downlink component carrier, only send contention resolved Msg.4 corresponding to described Msg.3.
The present invention is further illustrated below by embody rule example.
Embodiment one
Assuming that a lte-a system, in the fdd mode, downlink component carrier has 2, and the bandwidth of each downlink component carrier is 20MHz, and upstream components carrier wave has 1, and bandwidth is 20MHz, as shown in Figure 6 in work.
Following information (being not limited to following information) is broadcast in the broadcast channel of downlink component carrier 1,2
1) the frequency positional information of upstream components carrier wave 1 and bandwidth.
2) the Physical Random Access Channel configuration parameter on upstream components carrier wave 1.
If a user equipment downlink is synchronized with downlink component carrier 1, then this terminal sends random access guiding on upstream components carrier wave 1.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal uplink, by accidental access response, this Timing Advance is sent to terminal.Owing to cannot determine that the terminal synchronizes sending this signal is on downlink component carrier 1 or 2, base station all sends accidental access response on two downlink component carriers.
But in the accidental access response sent on downlink component carrier 1, signal channel resource allocation information is ULgrant_1, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 be assigned with one group of continuous print virtual resource blocks RIV_1; In the accidental access response that downlink component carrier 2 sends, signal channel resource allocation information is UL grant_2, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 to be assigned with another group continuous print virtual resource blocks RIV_2.The length L of these two groups of continuously and virtually Resource Block of RIV_1 and RIV_2 cRBsidentical (namely virtual resource number of blocks is identical), but original position is different, is respectively RB sTART_1 and RB sTART_2.And two groups of virtual resource blocks positions are orthogonal, non-overlapping copies.Assuming that ascending frequency-hopping is not enable, then virtual resource blocks maps directly on corresponding Physical Resource Block, n pRB=n vRB, as shown in Figure 7.
After terminal receives accidental access response, send Msg.3 according to (on the Physical Resource Block that namely RIV_1 is corresponding) in the resource of the Physical Uplink Shared Channel of correspondence on upstream components carrier wave 1 of the signal channel resource allocation information ULgrant_1 in accidental access response.Blind Detecting is done in base station on the Physical Resource Block that RIV_1 and RIV_2 is corresponding.After correct reception Msg.3, according to its Physical Resource Block location determination terminal synchronizes taken on downlink component carrier 1, and send contention resolved on downlink component carrier 1.
Embodiment two
Assuming that a lte-a system, in the fdd mode, downlink component carrier has 2, and the bandwidth of each downlink component carrier is 20MHz, and upstream components carrier wave has 1, and bandwidth is 20MHz, as shown in Figure 8 in work.
Following information (being not limited to following information) is broadcast in the broadcast channel of downlink component carrier 1,2
1) the frequency positional information of upstream components carrier wave 1 and bandwidth.
2) the Physical Random Access Channel configuration parameter on upstream components carrier wave 1.
If a user equipment downlink is synchronized with downlink component carrier 1, then this terminal sends random access guiding on upstream components carrier wave 1.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal uplink, by accidental access response, this Timing Advance is sent to terminal.Owing to cannot determine that the terminal synchronizes sending this signal is on downlink component carrier 1 or 2, base station all sends accidental access response on two downlink component carriers.
But in the accidental access response sent on downlink component carrier 1, signal channel resource allocation information is ULgrant_1, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 be assigned with one group of continuous print virtual resource blocks RIV_1; In the accidental access response that downlink component carrier 2 sends, signal channel resource allocation information is UL grant_2, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 to be assigned with another group continuous print virtual resource blocks RIV_2.The length L of RIV_1 and RIV_2 two groups of continuously and virtually Resource Block cRBsidentical (namely virtual resource number of blocks is identical), but original position is different, is respectively RB sTART_1 and RB sTART_2.And two groups of virtual resource blocks positions are not exclusively orthogonal, overlap.Assuming that ascending frequency-hopping is not enable, then virtual resource blocks maps directly on corresponding Physical Resource Block, n pRB=n vRB, as shown in Figure 9.
After terminal receives accidental access response, send Msg.3 according to (on the Physical Resource Block that namely RIV_1 is corresponding) in the resource of the Physical Uplink Shared Channel of correspondence on upstream components carrier wave 1 of the signal channel resource allocation information ULgrant_1 in accidental access response.Blind Detecting is done in base station on the Physical Resource Block that RIV_1 and RIV_2 is corresponding.After correct reception Msg.3, according to its Physical Resource Block location determination terminal synchronizes taken on downlink component carrier 1, and send contention resolved on downlink component carrier 1.
Embodiment three
Assuming that a lte-a system, in the fdd mode, downlink component carrier has 5, and the bandwidth of each downlink component carrier is 20MHz, and upstream components carrier wave has 2, and the bandwidth of each upstream components carrier wave is 20MHz, as shown in Figure 10 in work.
Following information (being not limited to following information) is broadcast in the broadcast channel of downlink component carrier 1,2,3
1) the frequency positional information of upstream components carrier wave 1 and bandwidth.
2) the Physical Random Access Channel configuration parameter on upstream components carrier wave 1.
Physical Random Access Channel configuration parameter on the upstream components carrier wave 1 of broadcast on downlink component carrier 1,2 is identical, namely Physical Random Access Channel configuration index is 9 (form of corresponding Physical Random Access Channel is 0, sub-frame of uplink 1 or 4 or 7 sends), frequency domain position is the 20th RB, and Article 1 can be 10 with the logic index of root sequence.
To be Physical Random Access Channel configuration index be Physical Random Access Channel configuration parameter on the upstream components carrier wave 1 of broadcast on downlink component carrier 3 that 9 (form of corresponding Physical Random Access Channel is 0, sub-frame of uplink 1 or 4 or 7 sends), frequency domain position is the 26th RB, and Article 1 can be 10 with the logic index of root sequence.
Following information (being not limited to following information) is broadcast in the broadcast channel of downlink component carrier 4,5
1) the frequency positional information of upstream components carrier wave 2 and bandwidth.
2) the Physical Random Access Channel configuration parameter on upstream components carrier wave 2.
Physical Random Access Channel configuration parameter on the upstream components carrier wave 2 of broadcast on downlink component carrier 4,5 is identical, namely Physical Random Access Channel configuration index is 9 (form of corresponding Physical Random Access Channel is 0, sub-frame of uplink 1 or 4 or 7 sends), frequency domain position is the 20th RB, and Article 1 can be 10 with the logic index of root sequence.
If a user equipment downlink is synchronized with downlink component carrier 1, then this terminal sends random access guiding on upstream components carrier wave 1, this random access guiding can send in subframe 1 or 4 or 7, and frequency domain initial position is the 20th RB, and Article 1 can be 10 with the logic index of root sequence.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal uplink, by accidental access response, this Timing Advance is sent to terminal.According to the root sequence of the subframe position of this random access guiding, frequency domain initial position and use, base station judges that the terminal synchronizes sending this signal is on downlink component carrier 1 or 2, base station all sends accidental access response on two downlink component carriers.
But in the accidental access response sent on downlink component carrier 1, signal channel resource allocation information is ULgrant_1, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 be assigned with one group of continuous print virtual resource blocks RIV_1; In the accidental access response that downlink component carrier 2 sends, signal channel resource allocation information is UL grant_2, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 to be assigned with another group continuous print virtual resource blocks RIV_2.The length L of RIV_1 and RIV_2 two groups of continuously and virtually Resource Block cRBsidentical (namely virtual resource number of blocks is identical), but original position is different, is respectively RB sTART_1 and RB sTART_2.And two groups of virtual resource blocks positions are orthogonal, non-overlapping copies.Assuming that frequency hopping is enable in sub-frame of uplink, then virtual resource blocks is mapped on corresponding Physical Resource Block according to certain rule, as shown in figure 11.
After terminal receives accidental access response, according to the signal channel resource allocation information ULgrant_1 in accidental access response, in the resource of the Physical Uplink Shared Channel of upstream components carrier wave 1 correspondence, (on the Physical Resource Block that namely RIV_1 is corresponding) sends Msg.3.Blind Detecting is done in base station on the Physical Resource Block that upstream components carrier wave 1 RIV_1 and RIV_2 is corresponding.After correct reception Msg.3, according to its Physical Resource Block location determination terminal synchronizes taken on downlink component carrier 1, and send contention resolved on downlink component carrier 1.
If a user equipment downlink is synchronized with downlink component carrier 3, then this terminal sends random access guiding on upstream components carrier wave 1, this random access guiding can send in subframe 1 or 4 or 7, and frequency domain initial position is the 26th RB, and Article 1 can be 10 with the logic index of root sequence.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal, by accidental access response, this Timing Advance is sent to terminal.Base station, according to the subframe position of this random access guiding, frequency domain initial position and the root sequence that uses, judges this user equipment downlink synchronously on downlink component carrier 3.Then accidental access response sends on downlink component carrier 3, and corresponding contention resolved also sends on downlink component carrier 3.
If a user equipment downlink is synchronized with downlink component carrier 5, then this terminal sends random access guiding on upstream components carrier wave 2, this random access guiding can send in subframe 1 or 4 or 7, and frequency domain initial position is the 20th RB, and Article 1 can be 10 with the logic index of root sequence.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal uplink, by accidental access response, this Timing Advance is sent to terminal.Owing to cannot determine that the terminal synchronizes sending this signal is on downlink component carrier 4 or 5, base station all sends accidental access response on two downlink component carriers.
But in the accidental access response sent on downlink component carrier 4, signal channel resource allocation information is ULgrant_4, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 2 of terminal transmits Msg.3 be assigned with one group of continuous print virtual resource blocks RIV_4; In the accidental access response that downlink component carrier 5 sends, signal channel resource allocation information is UL grant_5, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 2 of terminal transmits Msg.3 to be assigned with another group continuous print virtual resource blocks RIV_5.The length L of RIV_4 and RIV_5 two groups of continuously and virtually Resource Block cRBsidentical (namely virtual resource number of blocks is identical), but original position is different, is respectively RB sTART_4 and RB sTART_5.And two groups of virtual resource blocks positions are not exclusively orthogonal, overlap.Assuming that frequency hopping is enable in sub-frame of uplink, then virtual resource blocks is mapped on corresponding Physical Resource Block according to certain rule, as shown in figure 11.
After terminal receives accidental access response, according to the signal channel resource allocation information ULgrant_5 in accidental access response, in the resource of the Physical Uplink Shared Channel of upstream components carrier wave 2 correspondence, (on the Physical Resource Block that namely RIV_5 is corresponding) sends Msg.3.Blind Detecting is done in base station on the Physical Resource Block that upstream components carrier wave 2 RIV_4 and RIV_5 is corresponding.After correct reception Msg.3, according to its Physical Resource Block location determination terminal synchronizes taken on downlink component carrier 5, and send contention resolved on downlink component carrier 5.
Embodiment four
Assuming that a lte-a system, in the fdd mode, downlink component carrier has 2, and the bandwidth of each downlink component carrier is 20MHz, and upstream components carrier wave has 1, and bandwidth is 20MHz, as shown in figure 12 in work.
Following information (being not limited to following information) is broadcast in the broadcast channel of downlink component carrier 1,2
1) the frequency positional information of upstream components carrier wave 1 and bandwidth.
2) the Physical Random Access Channel configuration parameter on upstream components carrier wave 1.
If a user equipment downlink is synchronized with downlink component carrier 2, then this terminal sends random access guiding on upstream components carrier wave 2.Base station, after the random access guiding receiving the transmission of this terminal, detects the Timing Advance of terminal uplink, by accidental access response, this Timing Advance is sent to terminal.Owing to cannot determine that the terminal synchronizes sending this signal is on downlink component carrier 1 or 2, base station all sends accidental access response on two downlink component carriers.
But in the accidental access response sent on downlink component carrier 1, signal channel resource allocation information is ULgrant_1, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 be assigned with one group of discrete Physical Resource Block RBGs_1; In the accidental access response that downlink component carrier 2 sends, signal channel resource allocation information is UL grant_2, and it is next step Physical Uplink Shared Channel on upstream components carrier wave 1 of terminal transmits Msg.3 to be assigned with another and to organize discrete Physical Resource Block RBGs_2.The position of RBGs_1 and RBGs_2 two groups of non-contiguous physical Resource Block is orthogonal, non-overlapping copies, as shown in figure 13.
After terminal receives accidental access response, according to the signal channel resource allocation information ULgrant_2 in accidental access response, in the resource of the Physical Uplink Shared Channel of correspondence, (on the Physical Resource Block that namely RBGs_2 is corresponding) sends Msg.3.Blind Detecting is done in base station on the Physical Resource Block that RBGs_1 and RBGs_2 is corresponding.After correct reception Msg.3, according to its Physical Resource Block location determination terminal synchronizes taken on downlink component carrier 2, and send contention resolved on downlink component carrier 2.
Like this, when there being multiple downlink component carrier correspondence upstream components carrier wave, by sending different accidental access responses on different downlink component carriers, specifically in different accidental access responses, include different signal channel resource allocation informations, different Physical Resource Block is distributed, the different downlink component carrier of system banner to next step transmission of terminal Msg.3.Base station, according to the Physical Resource Block position at the Msg.3 place received, can determine this terminal synchronizes is on which downlink component carrier.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.

Claims (4)

1. identify a method for downlink component carrier in random access procedure, it is characterized in that,
After base station receives the random access guiding of terminal transmission, send the accidental access response that this random access guiding is corresponding, on all downlink component carriers sending described accidental access response, in the accidental access response that different downlink component carriers sends, carry different signal channel resource allocation informations;
After described base station receives the Msg.3 of scheduling of upstream transmissions first that terminal physically row shared channel sends, the resource of the described Physical Uplink Shared Channel shared by this Msg.3, determines the downlink component carrier that described terminal is synchronous;
Described signal channel resource allocation information refers to that base station assigns is to the positional information of one of terminal group of Resource Block and/or quantity information, and this group Resource Block is continuous print or discrete;
Describedly carry different signal channel resource allocation informations and refer to that the position of the Resource Block distributed for the Physical Uplink Shared Channel for transmitting Msg.3 carried in the accidental access response that different downlink component carrier sends is completely different or only overlap.
2. the method for claim 1, is characterized in that, described base station only sends the contention resolved Msg.4 corresponding with described Msg.3 on the downlink component carrier that described terminal is synchronous.
3. method as claimed in claim 1 or 2, it is characterized in that, when N number of downlink component carrier corresponds to 1 upstream components carrier wave, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, if base station receives described random access guiding on described upstream components carrier wave, N number of downlink component carrier that this upstream components carrier wave is corresponding sends accidental access response corresponding to this random access guiding.
4. method as claimed in claim 1 or 2, it is characterized in that, corresponding 1 the upstream components carrier wave of N number of downlink component carrier, namely described N number of downlink component carrier is notified of frequency positional information and the bandwidth of same upstream components carrier wave, and wherein M downlink component carrier is notified of the configuration index of the Physical Random Access Channel on identical described upstream components carrier wave, frequency domain initial position and Article 1 can use the logic index of root sequence, base station receives the described random access guiding that terminal sends on this upstream components carrier wave, this M downlink component carrier sends accidental access response corresponding to this random access guiding.
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