CN101742682B - Random access method between terminal and base station in LTE system - Google Patents
Random access method between terminal and base station in LTE system Download PDFInfo
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Abstract
The invention relates to a random access method between a terminal and a base station in an LTE system, belonging to the technical field of mobile communication. In the random access method in the LTE system, a terminal sends a random access precursor on a physical random access channel and then receives a random access response message in a specified receiving time window. The random access method is characterized in that the terminal monitors a physical downlink control channel related to the random access response message; the physical downlink control channel comprises a radio network temporary mark; and the radio network temporary mark is equal to the sum of a resource index of the physical random access channel sending the random access precursor and an off-set value. The random access method decreases the resources of a reserved RA-RNTI, reduces the complexity of interoperate between an MAC layer and a physical layer and simplifies the process that the MAC layer processes the RA-RNTI.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular in the LTE system accidental access method between the terminal and base station.
Background technology
The process that accesses at random in LTE Long Term Evolution (Long Term Evolution is referred to as LTE) as shown in Figure 1, mainly comprises two steps:
Step 1: terminal sends random access guiding at Physical Random Access Channel (PRACH)
Step 2: then terminal is waited in the time of reception window of regulation and is received the accidental access response message that the base station sends
For the ease of understanding the step of two above-mentioned random access procedures, below at first at random access configuration and frequency domain multiplexing and the mapping etc. of the frame structure in the LTE system, leading form, LTE system are briefly introduced.
The frame structure that two types are arranged in the LTE system, i.e. Type 1 and Type 2, wherein, Type 1 frame structure can be applied to fdd mode, and Type 2 frame structures can be applicable to tdd mode.Wherein, the frame structure of Type 1 and Type 2 is respectively such as Fig. 2 A Fig. 2 B, and shown in Fig. 2 A or Fig. 2 B, in the LTE frame structure, the radio frames of a 10ms is divided into the field of two 5ms, and each field is comprised of the subframe of 5 1ms.Except the special subframe of Type 2 frame structures, other subframe all is comprised of the time slot of two 0.5ms.Special subframe among the Type2 is by descending pilot frequency time slot (Downlink Pilot Time Slot; referred to as DwPTS), the protection interval (Guard Period; referred to as GP) and 3 special time slots compositions of uplink pilot time slot (Uplink Pilot Time Slot is referred to as UpPTS).In the LTE frame structure, the duration of a up/down row symbol is 66.7us, can attach a Cyclic Prefix (Cyclic Prefix, CP) before each up/down row symbol.Two kinds of Cyclic Prefix in LTE, have been defined: regular circulation prefix (Normal CP) and extended cyclic prefix (Extended CP), be the regular circulation prefix of 5.21us and 4.69us for length, a time slot comprises 7 up/down row symbols, wherein first symbol cyclic prefix length is 5.21us, and the circulating prefix-length of all the other 6 symbols is 4.69us; Be the extended cyclic prefix of 16.67us for length, a time slot comprises 6 up/down row symbols.
In Type 2 frame structures, subframe 0,5 and DwPTS be used for all the time downlink transfer, subframe 2 and UpPTS are used for uplink all the time.When 2 downstream-to-upstream transfer points were arranged in the 10ms, subframe 7 also was used for uplink.It is for uplink that other subframe is decided by the uplink and downlink configuration, or is used for downlink transfer.Present uplink and downlink proportional arrangement set is as shown in table 1, has 7 kinds of uplink and downlink configurations, and wherein D represents that subframe, U for downlink transfer represent that subframe, S for uplink represent special subframe, have comprised DwPTS, GP and UpPTS.And different frequency resources is adopted in Type 1 frame structure up-downgoing, so the number of sub frames of up-downgoing is always identical.
The set of table 1 LTE TDD up-downgoing proportional arrangement
Switch-point Subframee number (subframe numbers)
Configuration
periodicity
(config. number) 0123456789
(transfer point cycle)
0 5ms D S U U U D S U U U
1 5ms D S U U D D S U U D
2 5ms D S U D D D S U D D
3 10ms D S U U U D D D D D
4 10ms D S U U D D D D D D
5 10ms D S U D D D D D D D
6 5ms D S U U U D S U U D
The structure of PRACH channel as shown in Figure 3 in the LTE system.One leading (preamble) is comprised of CP and sequence (Sequence) two parts, and the CP of different leading form (preamble format) and/or Sequence length are different.The preambleformat kind that present LTE system TDD mode and fdd mode are all supported is as shown in table 2.
The leading form of table 2
Preamble format (leading form) T
CPT
SEQ
0 3168·T
s 24576·T
s
1 21024·T
s 24576·T
s
2 6240·T
s 2·24576·T
s
3 21024·T
s 2·24576·T
s
4
448·T
s 4096·T
s
(this form only is applied to tdd mode)
In the above-mentioned leading form, preamble format 0-3 transmits in the common sub-frame of uplink of TDD or FDD system, and preamble format 4 transmits in the UpPTS of TDD system, and, wherein,
Preamble format 0 transmits in a common sub-frame of uplink;
Preamble format 1,2 transmits in two common sub-frame of uplink;
Preamble format 3 transmits in three common sub-frame of uplink;
Preamble format 4 transmits in UpPTS;
At frequency domain, above-mentioned various PRACH account for 6 Resource Block (Resource Block is referred to as RB), and each RB comprises 12 subcarriers, and the bandwidth of each subcarrier is 15kHz.The at random access configuration of LTE FDD and TDD system is respectively such as table 3, shown in 4:
Table 3.LTE FDD accesses configuration at random
Table 4.LTE TDD system accesses configuration at random
Each configuration index that accesses at random (PRACH Configuration Index) corresponding the combination of a cover configuration parameter, concerning TDD, indicate the leading form of following content: PRACH, PRACH density (disposing how many bar PRACH channels in each radio frames), version number's (in the tdd mode, what this index provided is the version number of several different mappings modes of time domain) of time domain configuration and the initial subframe of each PRACH are in position and the frequency domain sequence number of time domain.For format4, the initial subframe of PRACH refers to UpPTS place subframe.Concerning FDD, indicate the leading form of following content: PRACH, the subframe numbers of radio frames interval (per 2 or each radio frames) and the initial subframe of PRACH.Configuration index is notified to terminal by broadcast.For LTE FDD system, only have at most a PRACH channel on the frequency domain, a radio frames can comprise at most 10 PRACH channels, all in time domain separately, concrete time-domain position is provided by table 3, and PRACH channels all on the frequency domain position are identical, by the unified configuration in base station.For LTE TDD system, each radio frames can comprise at most 6 PRACH channels, the PRACH channel mapping is the manner of formulation of frequency domain after the first time domain, can't not carry in time domain not the PRACH density of configuration under the prerequisite of overlapping PRACH by time-domain multiplexed when the time domain resource, can be on frequency domain multiplexing many PRACH channels, so can comprise at most 6 PRACH channels on the frequency domain.
In the LTE TDD system, corresponding to the PRACH configuration of table 4, under the different uplink-downlink configuration shown in the table 1, the position of the time domain of required each comfortable ascending resource of PRACH channel mapping is as shown in table 5, and the presentation format of the four-tuple in the table is (f
RA, t
RA 0, t
RA 1, t
RA 2), indicating a certain physical resource that accesses at random, namely indicate a certain PRACH channel, wherein f
RABe illustrated in by (t
RA 0, t
RA 1, t
RA 2) certain PRACH channel namely represents which bar PRACH channel of frequency domain on this time-domain position, f at the index of frequency domain on the time-domain position of appointment
RA∈ { 0,1,2,3,4,5}.
Indicate respectively certain PRACH be each radio frames or only the radio frames of even number or only in the radio frames at odd number by (t
RA 1, t
RA 2) resend again on the position in the frame of indication.
Indicating respectively certain PRACH is first field or second field that is positioned at a radio frames.For the PRACH channel of configuration use preamble format 0-3, t
RA 2The numbering of the sub-frame of uplink at the time domain mapping starting point place of expression PRACH channel in first field or second field, this numbering is sequentially compiled since 0, and No. 0 correspondence the first sub-frame of uplink except UpPTS in each field; Use the PRACH channel of Preamble format 4 always to be configured among the UpPTS, at this moment t in the form
RA 2Just be expressed as (*).
The Random Access Channel of table 5 LTE TDD is in the mapping of time domain and frequency domain
PRACH UL/DL configuration(See Table 4.2-2)
conf. 0 1 2 3 4 5 6
Index
(See
Table
5.7.1-3
)
0 (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0，
2) 1) 0) 2) 1) 0) 2)
1 (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0，
2) 1) 0) 2) 1) 0) 2)
2 (0，1，1， (0，1，1， (0，1，1， (0，1，0， (0，1，0， N/A (0，1，1，
2) 1) 0) 1) 0) 1)
3 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
2) 1) 0) 2) 1) 0) 2)
4 (0，0，1， (0，0，1， (0，0，1， (0，0，0， (0，0，0， N/A (0，0，1，
2) 1) 0) 1) 0) 1)
5 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A (0，0，0，
1) 0) 0) 1)
6 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
2) 1) 0) 1) 0) 0) 2)
(0，0，1， (0，0，1， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
7 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A (0，0，0，
1) 0) 0) 1)
(0，0，1， (0，0，1， (0，0，0， (0，0，1，
1) 0) 2) 0)
8 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，1， (0，0，0， (0，0，1，
0) 1) 1)
9 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 0) 0) 0) 0) 1)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
2) 1) 0) 1) 1) 0) 2)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
10 (0，0，0， (0，0，0， (0，0，0， N/A (0，0，0， N/A (0，0，0，
0) 1) 0) 0) 0)
(0，0，1， (0，0，1， (0，0，0， (0，0，0，
0) (0，0，1， 0) 1) 2)
(0，0，1， 0) (1，0，1， (1，0，0， (0，0，1，
1) (0，0，1， 0) 0) 0)
1)
11 N/A (0，0，0， N/A N/A N/A N/A (0，0，0，
0) 1)
(0，0，0， (0，0，1，
1) 0)
(0，0，1， (0，0，1，
0) 1)
12 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 0) 0) 0) 0) 1)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
2) 1) 0) 1) 1) 0) 2)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，1，
1) 0) 0) 2) 0) 0) 0)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
13 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
2) 1) 1)
(0，0，1， (0，0，0， (0，0，0，
0) 2) 2)
(0，0，1， (1，0，0， (0，0，1，
2) 1) 1)
14 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
1) 1) 2)
(0，0，1， (0，0，0， (0，0，1，
0) 2) 0)
(0，0，1， (1，0，0， (0，0，1，
1) 0) 1)
15 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
0) 0) 0) 0) 0) 0) 0)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
1) 1) 0) 1) 1) 0) 1)
(0，0，0， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，0，
2) 0) 0) 2) 0) 0) 2)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
1) 1) 0) 1) 1) 0) 0)
(0，0，1， (1，0，0， (2，0，0， (1，0，0， (2，0，0， (4，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
16 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， N/A N/A
1) 0) 0) 0) 0)
(0，1，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0，
2) 1) 0) 1) 1)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0，
0) 0) 0) 2) 0)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0，
1) 1) 0) 0) 1)
(0，0，1， (1，0，1， (2，0，1， (1，0，0， (2，0，0，
2) 1) 0) 2) 0)
17 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A N/A
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
1) 1) 1)
(0，0，0， (0，0，1， (0，0，0，
2) 0) 2)
(0，0，1， (0，0，1，
0) 1) (1，0，0，
(0，0，1， (1，0，0， 0)
2) 0) (1，0，0，
1)
18 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
0) 0) 0) 0) 0) 0) 0)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
1) 1) 0) 1) 1) 0) 1)
(0，0，0， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，0，
2) 0) 0) 2) 0) 0) 2)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
0) 1) 0) 0) 1) 0) 0)
(0，0，1， (1，0，0， (2，0，0， (1，0，0， (2，0，0， (4，0，0， (0，0，1，
1) 1) 0) 1) 0) 0) 1)
(0，0，1， (1，0，1， (2，0，1， (1，0，0， (2，0，0， (5，0，0， (1，0，0，
2) 1) 0) 2) 1) 0) 2)
19 N/A (0，0，0， N/A N/A N/A N/A (0，0，0，
0) 0)
(0，0，0， (0，0，0，
1) 1)
(0，0，1， (0，0，0，
0) 2)
(0，0，1， (0，0，1，
1) 0)
(1，0，0， (0，0，1，
0) 1)
(1，0，1， (1，0，1，
0) 1)
20/30 (0，1，0， (0，1，0， N/A (0，1，0， (0，1，0， N/A (0，1，0，
1) 0) 1) 0) 1)
21/31 (0，2，0， (0，2，0， N/A (0，2，0， (0，2，0， N/A (0，2，0，
1) 0) 1) 0) 1)
22/32 (0，1，1， (0，1，1， N/A N/A N/A N/A (0，1，1，
1) 0) 0)
23/33 (0，0，0， (0，0，0， N/A (0，0，0， (0，0，0， N/A (0，0，0，
1) 0) 1) 0) 1)
24/34 (0，0，1， (0，0，1， N/A N/A N/A N/A (0，0，1，
1) 0) 0)
25/35 (0，0，0， (0，0，0， N/A (0，0，0， (0，0，0， N/A (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
26/36 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) N/A 1) 0) N/A 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
27/37 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) N/A 1) 0) N/A 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
28/38 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， N/A (1，0，0， (1，0，0， N/A (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
(2，0，0， (2，0，0， (4，0，0， (4，0，0， (2，0，0，
1) 0) 1) 0) 1)
29/39 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， N/A (1，0，0， (1，0，0， N/A (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
(2，0，0， (2，0，0， (4，0，0， (4，0，0， (2，0，0，
1) 0) 1) 0) 1)
(2，0，1， (2，0，1， (5，0，0， (5，0，0， (2，0，1，
1) 0) 1) 0) 0)
40 (0，1，0， N/A N/A (0，1，0， N/A N/A (0，1，0，
0) 0) 0)
41 (0，2，0， N/A N/A (0，2，0， N/A N/A (0，2，0，
0) 0) 0)
42 (0，1，1， N/A N/A N/A N/A N/A N/A
0)
43 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
44 (0，0，1， N/A N/A N/A N/A N/A N/A
0)
45 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
46 (0，0，0， (0，0，0， (0，0，0，
0) N/A N/A 0) N/A N/A 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
(1，0，0， (2，0，0， (2，0，0，
0) 0) 0)
47 (0，0，0， (0，0，0， (0，0，0，
0) N/A N/A 0) N/A N/A 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
(1，0，0， (2，0，0， (2，0，0，
0) 0) 0)
(1，0，1， (3，0，0， (3，0，0，
0) 0) 0)
48 (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0，
*) *) *) *) *) *) *)
49 (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0，
*) *) *) *) *) *) *)
50 (0，1，1， (0，1，1， (0，1，1， N/A N/A N/A (0，1，1，
*) *) *) *)
51 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
52 (0，0，1， (0，0，1， (0，0，1， N/A N/A N/A (0，0，1，
*) *) *) *)
53 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
54 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
55 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
56 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
(2，0，0， (2，0，0， (2，0，0， (4，0，0， (4，0，0， (4，0，0， (2，0，0，
*) *) *) *) *) *) *)
57 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
(2，0，0， (2，0，0， (2，0，0， (4，0，0， (4，0，0， (4，0，0， (2，0，0，
*) *) *) *) *) *) *)
(2，0，1， (2，0，1， (2，0，1， (5，0，0， (5，0，0， (5，0，0， (2，0，1，
*)*) *) *) *) *) *)
As can be seen from Table 5, when time domain inadequate resource during with the PRACH number of channel that time division multiplexing was disposed, the time-domain position of many PRACH channels is identical, and will adopt frequency division multiplexing to shine upon these PRACH channels this moment on this time-domain position.In common sub-frame of uplink, the frequency domain mapping method of the PRACH channel of frequency domain multiplexing is for to shine upon from the frequency band both sides to the centre, so that PRACH has certain interval at frequency domain, has diversity gain, and mapping method is shown in formula (1); For the Random Access Channel on the UpPTS, the PRACH of frequency domain multiplexing is the alternately mapping of upper lower sideband at frequency band between two UpPTS, and on each UpPTS, a plurality of frequency domain PRACH be Continuous Mappings at lower sideband or the upper sideband of frequency band, mapping method is shown in formula (2).
Wherein, n
PRB offset RAFrequency domain initial position for the PRACH channel; N
RB ULBe RB number altogether corresponding to up-link bandwidth preparation; f
RAFrequency domain index for the identical PRACH channel of time-domain position;
Expression rounds downwards.n
fBe System Frame Number, N
SPIt is the transfer point number of downstream-to-upstream in the radio frames.
Can specifically indicate certain Random Access Channel in the radio frames with a random access channel resource index (PRACH resource index is called for short PRI).For FDD, PRI corresponds to the relative sequence number of the initial wireless sub-frame of PRACH in a radio frames.Take PRACH configuration index 13 as example, 5 PRACH subframes are arranged in a radio frames, subframe numbers is respectively 1,3,5,7,9, their PRI is respectively 0,1,2,3,4.Concerning TDD, PRI corresponds to the order that occurs in PRACH channel set corresponding to PRACH configuration index and uplink/downlink configuration combination in the form 5.Take PRACH configuration index 15 as example, if uplink/downlink is configured to 0,5 initial subframes of PRACH in a radio frames can represent with 5 four-tuple in the position of time domain and frequency domain so, are respectively (0,0 according to sequencing, 0,0), (0,0,0,1), (0,0,0,2), (0,0,1,1), (0,0,1,2), the PRI of their correspondences is respectively 0,1,2,3,4.
In the random access procedure of Fig. 1, the terminal at identical PRACH transmission random access guiding in the step 1 can be more than one or one.
In step 2, the time of reception window of regulation can represent that wherein window size is less than or equal to 10ms with a time migration and window size.Be 3ms such as time migration, and window size is 5ms, this just represent terminal from the 3ms that sends random access guiding later on, receiving random access response message in the time range of 5ms.
The base station is distinguished in the position of time domain and frequency domain according to the random access guiding of terminal transmission and the PRACH of transmission random access guiding, and in accidental access response message, relevant information is fed back to terminal, be used for representing that the accidental access response message in the step 2 sends to that terminal.Wherein the information relevant in the position of time domain and frequency domain with PRACH represents with a random access radio network temporary mark (RA-RNTI), this sign is included on the Physical Downlink Control Channel that sends accidental access response message (PDCCH), specifically covers on the CRC of PDCCH information bit.And the relevant information of random access guiding is included on the PDCCH Physical Downlink Shared Channel pointed (PDSCH), and the index of the random access guiding that specifically sends with terminal represents.
RA-RNTI and the corresponding relation of PRACH channel between the position of time domain and frequency domain are to represent with following formula among the present LTE:
RA-RNTI＝t_id+10*f_id
Wherein t_id represents the subframe numbers of the initial subframe of PRACH channel; F_id represents the sequence number that the PRACH channel is arranged according to ascending order in this subframe in frequency domain.For FDD, f_id always equals 0.For TDD, f_id is more than or equal to 0, less than 6.If two terminals send the PRACH of random access guiding in time at a distance of surpassing 10ms, so because the window size of LTE always is not more than 10ms, and time migration is the same, so the time of reception window of receiving random access response message can be not overlapping for these two terminals, so always can not obscure.If the PRACH of two terminal transmission random access guidings is no more than 10ms in time apart, need so to distinguish accidental access response message by the unique RA-RNTI of size.And above-mentioned corresponding relation has guaranteed that any two not identical corresponding RA-RNTI of PRACH channel that are no more than in time 10ms apart are different.
This corresponding method needs to reserve 10 Radio Network Temporary Identifiers (RNTI) for FDD.For TDD, need to reserve 60 RNTI.And reality density of PRACH maximum for TDD is 6, namely in the time range of a radio frames, 6 PRACH channels occur at most.From the angle of RNTI resource present corresponding relation to little waste the resource of 90% RNTI.
The important impact of another one is the complexity of system.Terminal was obtained the configuration parameter of Random Access Channel from system message or dedicated signaling before the transmission random access guiding, comprise PRACH configuration index and uplink/downlink configuration parameter.Terminal determines that according to these two parameters (as long as concerning FDD PRACH configuration index) the PRACH channel is in position that time domain and frequency domain may occur.The MAC of terminal (media access control) layer protocol need to be mapped to RA-RNTI to the time domain at selected PRACH channel place and the position of frequency domain selecting (perhaps to have been specified by network) after certain PRACH channel sends random access guiding.Then mac-layer protocol is notified this RA-RNTI to physical layer when requiring physical layer to send random access guiding.Physical layer sends the PRACH channel of random access guiding reality in the position of time domain and frequency domain according to RA-RNTI reflection ejaculation.This process is fairly simple for FDD, because the subframe numbers of RA-RNTI and the initial subframe of PRACH channel on time domain is the same.More complicated then for TDD, and comprised that mapping and reflection penetrate two processes.
If network specifies in the radio frames certain PRACH channel to terminal, wherein method is to adopt PRI to specify certain PRACH channel in one.Mac-layer protocol need to be mapped to RA-RNTI to this PRI, then notifies physical layer.Physical layer penetrates the PRACH channel of transmission random access guiding reality in the position of time domain and frequency domain from the RA-RNTI reflection again.
Summary of the invention
For the defective that exists in the prior art and deficiency, the technical problem to be solved in the present invention is to propose accidental access method in a kind of LTE system with solving the above-mentioned RNTI wasting of resources, and the problem of the complexity that causes to interoperability between the wireless protocols MAC layer of terminal and the physical layer of described RA-RNTI.
For solving the problems of the technologies described above, technical scheme of the present invention is: the accidental access method in a kind of LTE system, terminal is after Physical Random Access Channel sends random access guiding, receiving random access response message in the time of reception window of regulation is characterized in that: the Physical Downlink Control Channel that described terminal monitoring is relevant with described accidental access response message; Described Physical Downlink Control Channel comprises a Radio Network Temporary Identifier; Described Radio Network Temporary Identifier equal to send the resource index of described Physical Random Access Channel of described random access guiding and a deviant and.
Further, the resource index of described Physical Random Access Channel is the Unified number of described Physical Random Access Channel in radio frames, the described Physical Random Access Channel of the initial subframe Unified number of described Physical Random Access Channel in radio frames refers to to(for) FDD in radio frames according to the relative sequence number that increases order and arrange; The described Physical Random Access Channel of the initial subframe Unified number of described Physical Random Access Channel in radio frames refers to to(for) TDD is the tactic relative sequence number of frequency domain after the position of time domain and frequency domain is according to first time domain.
Further, the size of described time of reception window is no more than 10 milliseconds, and described time of reception window is broadcasted by system message, perhaps sends to described terminal by dedicated signaling, and described terminal is initiating to obtain described time of reception window parameter before the access at random.Described deviant can be 0 or greater than 0 constant, its length is fixed, and the length of described Radio Network Temporary Identifier and described deviant is 16 bits.
Further, described Physical Downlink Control Channel comprises the downlink radio resource configuration information, be used to refer to the time-frequency domain Radio Resource of Physical Downlink Shared Channel of the described accidental access response message of carrying, described Physical Random Access Channel be described terminal oneself freely select or by network by the dedicated signaling appointment or in the scope of network appointment, freely select.
Adopt accidental access method of the present invention, reduced the resource of the RA-RNTI that reserves, reduced the complexity of the interoperability between MAC layer and the physical layer, also simplified the process of MAC layer processing RA-RNTI simultaneously.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart that accesses at random;
Fig. 2 A is the frame structure schematic diagram of Type 1 in the embodiment of the invention;
Fig. 2 B is the frame structure schematic diagram of Type 2 in the embodiment of the invention;
Fig. 3 is the structural representation of PRACH channel in the embodiment of the invention.
Embodiment
The following stated embodiment is applied to the random access procedure based on conflict, also can be applied to the random access procedure based on non-conflict.For the random access procedure based on conflict, terminal oneself selects a PRACH channel to send random access guiding.For the random access procedure based on non-conflict, network can be given the random access guiding of a special use of terminal distribution, and the Random Access Channel mask index relevant with this special-purpose random access guiding.This Random Access Channel mask index has represented PRI or certain combination of PRACH channel of interior certain a PRACH channel of radio frames, such as PRACH channels all in the radio frames, perhaps such as the PRACH channel on the PRACH time slot of odd number or even number position.The PRACH time slot refers to comprise the position of wireless sub-frame on time domain of PRACH channel.
Random access procedure based on conflict can be used for Radio Resource control (RRC) establishment of connection, process of reconstruction, and upstream data arrives the random access procedure that triggers.
Can be used for downlink data based on the random access procedure of non-conflict reaches or switches the random access procedure that causes.Always begin this process by network by the dedicated signaling notification terminal.
Terminal after having determined to send the PRACH channel of random access guiding, the PRI that RA-RNTI is set to and this PRACH channel is corresponding, i.e. RA-RNTI=PRI+RNTI-OFFSET, wherein RNTI-OFFSET is one and is greater than or equal to 0 constant.PRI corresponding to PRACH channel is unique in a radio frames, so can guarantee that also any two different corresponding RA-RNTI of PRACH channel that are no more than in time 10ms apart can be not the same.Among the following embodiment, RNTI-OFFSET=0.
Embodiment 1 is based on the random access procedure of conflict, fdd mode
Suppose that the PRACH configuration index is 12 in certain LTE residential quarter, the size of receive window is 6ms.The subframe numbers of the initial subframe of PRACH that this configuration index is corresponding is respectively 0,2,4,6,8.The PRI of their correspondences is respectively 0,1,2,3,4.Suppose that terminal connects initiating random access procedure in order to set up RRC, and to have selected initial subframe number be that 2 PRACH channel sends at random access, this random access procedure is so so:
Step 11, it is 2 that terminal is chosen in subframe numbers at mac-layer protocol, namely PRI is that to send an index on 1 the PRACH channel be 37 random access guiding, and the RA-RNTI of correspondence is set to 1.Then the random access guiding of selecting, the parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding at selected PRACH channel;
Step 12, the physical layer of terminal be according to RA-RNTI, is after 2 PRACH channel has sent random access guiding, to receive an accidental access response message in receive window at subframe numbers.Wherein the RA-RNTI on the corresponding PDCCH channel equals 1.So the transmission block that the PDSCH that physical layer obtains decoding upward carries is to the mac-layer protocol processing entities;
Step 13 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message corresponding to random access guiding of own transmission.
Embodiment 2 is based on the random access procedure of conflict, tdd mode
Suppose that the PRACH configuration index is 18 in certain LTE residential quarter, the size of receive window is 10ms, and uplink/downlink is configured to 1.The four-tuple of the initial subframe of PRACH that this configuration index is corresponding is respectively (0,0,0,0), (0,0,0,1), (0,0,1,0), (0,0,1,1), (1,0,0,1), (1,0,1,1).The PRI of their correspondences is respectively 0,1,2,3,4,5.Suppose that terminal connects initiating random access procedure in order to set up RRC, and to have selected PRI be that 5 PRACH channel sends at random access, this random access procedure is so so:
Step 21, terminal mac-layer protocol select PRI be 5 PRACH channel to send an index be 37 random access guiding, and the RA-RNTI of correspondence is set to 5.Then the random access guiding of selecting, the parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding at selected PRACH channel;
Step 22, the physical layer of terminal are 1 at PRACH at the index of frequency domain according to RA-RNTI, and subframe numbers is to have sent after the random access guiding on 8 the PRACH channel, receives an accidental access response message in receive window.Wherein the RA-RNTI on the corresponding PDCCH channel equals 5.So the transmission block that the PDSCH that physical layer obtains decoding upward carries is to the mac-layer protocol processing entities;
Step 23 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message corresponding to random access guiding of own transmission.
Embodiment 3 is based on the random access procedure of non-conflict, fdd mode
Suppose that the PRACH configuration index is 12 in certain LTE residential quarter, the size of receive window is 6ms.The subframe numbers of the initial subframe of PRACH that this configuration index is corresponding is respectively 0,2,4,6,8.The PRI of their correspondences is respectively 0,1,2,3,4.Suppose that terminal is in the RRC connection status, but lost uplink synchronous.Network descending have data to arrive buffering in, by PDCCH channel notification terminal initiating random access procedure, this random access procedure is so so:
Step 30, the base station is that to send index be 37 random access guiding for 3 PRACH channel by PDCCH channel notification terminal at PRI;
Step 31, terminal is after receiving this PDCCH signaling, the RA-RNTI that the MAC layer is corresponding is set to 3, then the random access guiding of network requirement, the parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding at selected PRACH channel;
Step 32, the physical layer of terminal be according to RA-RNTI, is after 6 PRACH channel has sent random access guiding, to receive an accidental access response message in receive window at subframe numbers.Wherein the RA-RNTI on the corresponding PDCCH channel equals 3.So the transmission block that the PDSCH that physical layer obtains decoding upward carries is to the mac-layer protocol processing entities;
Step 33 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message corresponding to random access guiding of own transmission.
Embodiment 4 is based on the random access procedure of non-conflict, tdd mode
Suppose that the PRACH configuration index is 18 in certain LTE residential quarter, the size of receive window is 10ms, and uplink/downlink is configured to 1.The four-tuple of the initial subframe of PRACH that this configuration index is corresponding is respectively (0,0,0,0), (0,0,0,1), (0,0,1,0), (0,0,1,1), (1,0,0,1), (1,0,1,1).The PRI of their correspondences is respectively 0,1,2,3,4,5.Suppose that terminal is in the RRC connection status, and network is want this terminal is switched to Target cell.Target cell sends a RRC by the cell-of-origin and connects reallocation message, and notification terminal switches.This random access procedure is so so:
Step 40, it is that to send index be 37 random access guiding for 2 PRACH channel at PRI that Target cell connects designated terminal in the reallocation message at RRC
Step 41, terminal are after receiving this message, and the RA-RNTI that mac-layer protocol is corresponding is set to 2.Then the random access guiding of network requirement, the parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding at selected PRACH channel;
Step 22, the physical layer of terminal are 0 at PRACH at the index of frequency domain according to RA-RNTI, and subframe numbers is to have sent after the random access guiding on 7 the PRACH channel, receives an accidental access response message in receive window.Wherein the RA-RNTI on the corresponding PDCCH channel equals 2.So the transmission block that the PDSCH that physical layer obtains decoding upward carries is to the mac-layer protocol processing entities;
Step 23 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message corresponding to random access guiding of own transmission.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and 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 modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the accidental access method in the LTE system, terminal is after Physical Random Access Channel sends random access guiding, receiving random access response message in the time of reception window of regulation is characterized in that: the Physical Downlink Control Channel that described terminal monitoring is relevant with described accidental access response message; Described Physical Downlink Control Channel comprises a Radio Network Temporary Identifier; Described Radio Network Temporary Identifier equal to send the resource index of described Physical Random Access Channel of described random access guiding and a deviant and.
2. method according to claim 1 is characterized in that, the resource index of described Physical Random Access Channel is the Unified number of described Physical Random Access Channel in radio frames.
3. method according to claim 2 is characterized in that, the described Physical Random Access Channel of the initial subframe Unified number of described Physical Random Access Channel in radio frames refers to to(for) FDD in radio frames according to the relative sequence number that increases order and arrange.
4. method according to claim 2, it is characterized in that the described Physical Random Access Channel of the initial subframe Unified number of described Physical Random Access Channel in radio frames refers to to(for) TDD is the tactic relative sequence number of frequency domain after the position of time domain and frequency domain is according to first time domain.
5. method according to claim 1 is characterized in that, the size of described time of reception window is no more than 10 milliseconds.
6. according to claim 1 or 5 described methods, it is characterized in that described time of reception window is broadcasted by system message, perhaps sends to described terminal by dedicated signaling, described terminal is initiating to obtain described time of reception window parameter before the access at random.
7. method according to claim 1 is characterized in that, described deviant is 0 or greater than 0 constant, its length is fixed.
8. method according to claim 1 is characterized in that, the length of described Radio Network Temporary Identifier and described deviant is 16 bits.
9. method according to claim 1 is characterized in that, described Physical Downlink Control Channel comprises the downlink radio resource configuration information, is used to refer to the time-frequency domain Radio Resource of the Physical Downlink Shared Channel of the described accidental access response message of carrying.
10. method according to claim 1 is characterized in that, described Physical Random Access Channel be described terminal oneself freely select or by network by the dedicated signaling appointment or in the scope of network appointment, freely select.
11. method according to claim 1 is characterized in that, described random access guiding to be terminal oneself select according to certain principle or by network by the dedicated signaling appointment.
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| CN101742682A (en) | 2010-06-16 |
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