CN101340725A - Resource distribution method of physical random access channel - Google Patents

Resource distribution method of physical random access channel Download PDF

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CN101340725A
CN101340725A CNA2008101354440A CN200810135444A CN101340725A CN 101340725 A CN101340725 A CN 101340725A CN A2008101354440 A CNA2008101354440 A CN A2008101354440A CN 200810135444 A CN200810135444 A CN 200810135444A CN 101340725 A CN101340725 A CN 101340725A
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prach
frequency domain
initial position
resource
resource block
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CN101340725B (en
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郝鹏
喻斌
戴博
梁春丽
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ZTE Corp
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Abstract

The invention discloses a resource distribution method of a physical random access passage, comprising the steps as follows: when resource is distributed to PRACH, the frequency domain resource of each PRACH is alternatively mapped to two sides of the initial position and the frequency domain resource of each PRACH is ensured to be continuous by taking a certain initial position on the frequency domain as the center for one or more PRACH with the same time domain positions. The method of the invention can ensure that the PRACH and PUCCH are not mutually interfered and that the resource of the PUSCH is not cut as multi-section; furthermore, the maximum bandwidth of PUCCH is not necessary to be taken into account.

Description

A kind of resource allocation methods of Physical Random Access Channel
Technical field
The present invention relates to the communications field, be specifically related to a kind of resource allocation methods of Physical Random Access Channel.
Background technology
The frame structure (being called the second class frame structure again, i.e. frame structure type 2) of LTE (Long Term Evolution) system TDD (Time Division Duplex, time division duplex) pattern as shown in Figure 1.In this frame structure, (307200Ts, radio frames 1ms=30720Ts) is divided into two fields to a 10ms, the long 5ms of each field (153600Ts).The subframe that it is 1ms that each field comprises 5 length.The effect of each subframe is as shown in table 1, and wherein the D representative is used for the descending sub frame of transmission of downlink signal.The U representative is used to transmit the sub-frame of uplink of upward signal.In addition, upstream or downstream subframe is divided into the time slot of 2 0.5ms again.S represents special subframe, comprises three special time slots, i.e. DwPTS (Downlink PilotTime Slot, descending pilot frequency time slot), GP (Guard Period, protection at interval) and UpPTS (UplinkPilot Time Slot, uplink pilot time slot).In real system, the uplink and downlink configuration index can be notified to mobile phone by broadcast.
Table 1 uplink and downlink sub-frame configuration
Figure A20081013544400051
The frame structure (being called first kind frame structure again, i.e. frame structure type 1) of the FDD of LTE system (Frequency Division Duplex, Frequency Division Duplexing (FDD)) pattern as shown in Figure 2.The radio frames of a 10ms is divided into the time slot of 20 0.5ms, and adjacent 2 time slots are formed the subframe that length is 1ms, and promptly subframe i is made up of time slot 2i and 2i+1, i=0 wherein, and 1 ..., 9.Under fdd mode, 10 subframes all are used for the transmission of upstream or downstream signal, distinguish by different frequency bands between the uplink and downlink.
The structure of LTE system physical accidental access channel (PRACH, Physical Random Access Channel, or be called and insert chance at random, i.e. random access opportunity) as shown in Figure 3.Preamble (leading) is made up of cyclic prefix CP and sequence Sequence two parts, and different preambleformat (leading form) means different CP and/or Sequence length.The preamble format kind of LTE system TDD mode support at present is as shown in table 2.
The leading form of table 2
Preamble format The CP length T CP The Sequence length T SEQ
0 3168Ts 24576Ts
1 21024Ts 24576Ts
2 6240Ts 2×24576Ts
3 21024Ts 2×24576Ts
4 (only for the second class frame structures) 448Ts 4096Ts
In the above-mentioned leading form, preamble format 0～3 transmits in common sub-frame of uplink, and preambleformat 4 transmits in UpPTS.
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 (original position sends on the 5158Ts position in advance at the place, end of UpPTS) in UpPTS
Resource allocation in the LTE system is with RB (Resource Block, Resource Block) is unit, a RB accounts for 12 RE (Resource Element on frequency domain, resource element, on time domain, account for an OFDM symbol), on time domain, account for a time slot, i.e. 7 (common CP, Normal cyclic prefix) or 6 (expansion CP, Extended cyclic prefix) SC-OFDM symbols.If the RB of definition up-link bandwidth correspondence adds up to N RB UL, then the index of RB is 0,1 ..., N RB UL-1, as shown in Figure 4.
At frequency domain, a PRACH channel accounts for 6 pairing bandwidth of RB, i.e. 72 RE, and the bandwidth of each RE is 15kHz.The PRACH channel that time-domain position is identical is distinguished by frequency domain.
On frequency domain, common sub-frame of uplink can transmit PRACH channel, Physical Shared Channel (PUSCH, Physical uplink shared channel), Physical Uplink Control Channel (PUCCH, Physical uplinkcontrol channel), detection reference signal physical channel/signals such as (SRS, Sounding reference signal).Can the transmitting SRS signal in the UpPTS and leading form be 4 PRACH channel.
The PUCCH channel format can be divided into two big classes, and totally 6 kinds: the first kind comprises 3 kinds of forms, i.e. format1,1a, 1b, and second class comprises 3 kinds of forms, i.e. format 2,2a, 2b.First kind PUCCH is used to transmit SR (dispatch request, scheduling request) and ACK (Acknowledgement)/NACK (Negative Acknowledgement) signaling, wherein, format 1 is used to transmit the ACK/NACK that ACK/NACK, format 1b that SR, format 1a be used to transmit single codeword stream are used to transmit two streams of code words.The second class PUCCH is mainly used in transmission CQI (Channel Quality Indicator), wherein 2 of format transmit CQI, format 2a is used for transmitting simultaneously the ACK/NACK of CQI and single codeword stream, and format 2b is used for transmitting simultaneously the ACK/NACK of CQI and two streams of code words.First kind PUCCH quantity (CCE, Control Channel Element) of shared RB number and down control channel unit in a time slot is relevant, is dynamic change; The second class PUCCH shared RB number in a time slot is notified to all UE in the sub-district by broadcast channel, is semi-static preparation.In addition, for fear of the waste of sign indicating number resource, the LTE system has also defined mixing RB, the multiplexing first kind and the second class PUCCH channel.Whether exist mixing RB to prepare in the system, and in a time slot, have one to mix RB at most.In common sub-frame of uplink, the channel architecture of PUCCH as shown in Figure 5, on frequency domain, the shared RB of PUCCH is distributed in the two ends of the whole frequency domain of system, just lays respectively at the upper sideband (being several RB of index maximum) and the lower sideband (being several RB of index minimum) of frequency domain.
At present, in common sub-frame of uplink, the frequency domain mapping method of PRACH channel is for to shine upon from both sides to the centre, and mapping method as shown in Equation (1).
Figure A20081013544400071
Wherein, n PRBoffset RAFrequency domain initial position for the PRACH channel; N RB ULBe the corresponding RB number altogether of up-link bandwidth preparation; f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A20081013544400072
Expression rounds downwards.n PRBoffset RAValue is related to the position of PRACH channel on frequency domain, if design the improper interference that can produce between PRACH and the PUCCH, or makes the PUSCH resource be divided into multistage, increases the complexity of scheduling.
Because the frequency domain position of PUCCH is at the two ends of whole frequency band, this requires the PRACH and then maximum bandwidth of PUCCH transmission on frequency domain, as shown in Figure 6.Therefore, in order to guarantee the performance of this PRACH channel of formula (1) frequency domain mapping method, requirement can be predicted the maximum transmission bandwidth of PUCCH more accurately.And since the quantity random time of first kind PUCCH channel change, cause the needed RB number of PUCCH also random time change, make the maximum bandwidth of the predicting PUCCH accurately comparison difficulty that becomes.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of resource allocation methods of Physical Random Access Channel, can guarantee not produce between PRACH and the PUCCH and interfere with each other, the resource that can guarantee PUSCH again is not divided into multistage, and wherein can consider the maximum bandwidth of PUCCH.
In order to solve the problems of the technologies described above, the invention provides a kind of resource allocation methods of Physical Random Access Channel, comprise,
During for Physical Random Access Channel PRACH Resources allocation, for the identical one or more PRACH of time-domain position, on frequency domain, be the center, the frequency domain resource of each PRACH alternately is mapped to the both sides of this initial position and guarantees that the frequency domain resource of each PRACH is continuous with a certain initial position.
Further, above-mentioned resource allocation methods also can comprise, when the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, is earlier upwards, alternately shines upon to described initial position both sides downwards again.
Further, above-mentioned resource allocation methods also can comprise, the Resource Block index of each PRACH frequency domain initial position calculates according to following formula:
Figure A20081013544400081
Wherein, n PRB RABe the Resource Block index of PRACH frequency domain initial position, f RABe the frequency domain index of the identical PRACH of time-domain position, n PRBoffset RABe the Resource Block index of described initial position,
Figure A20081013544400082
Expression rounds up.
Further, above-mentioned resource allocation methods also can comprise, when the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, is earlier downwards, upwards alternately shines upon to described initial position both sides again.
Further, above-mentioned resource allocation methods also can comprise, the Resource Block index of each PRACH frequency domain initial position calculates according to following formula,
Figure A20081013544400091
Wherein, n PRB RABe the Resource Block index of PRACH frequency domain initial position, f RABe the frequency domain index of the identical PRACH of time-domain position, n PRBoffset RABe the Resource Block index of described initial position,
Figure A20081013544400092
Expression rounds up.
Further, above-mentioned resource allocation methods can comprise that also the Resource Block index of described initial position is
Figure A20081013544400093
Figure A20081013544400094
Figure A20081013544400095
Figure A20081013544400096
Figure A20081013544400097
Or
Figure A20081013544400098
Wherein, n PRBoffset RABe the Resource Block index of described frequency domain initial position, N RB ULBe the pairing number of resource blocks of up-link bandwidth,
Figure A20081013544400099
Expression rounds up,
Figure A200810135444000910
Expression rounds downwards.
Further, above-mentioned resource allocation methods can comprise that also the frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
The present invention also provides a kind of resource allocation methods of Physical Random Access Channel, comprises,
During for Physical Random Access Channel PRACH Resources allocation,, determine an initial position at frequency domain earlier, be calculated as follows the Resource Block index of each PRACH frequency domain initial position then for the identical one or more PRACH of time-domain position:
Figure A200810135444000911
Or
Figure A20081013544400101
Wherein, n PRB RABe the Resource Block index of each PRACH frequency domain initial position, n PRBoffset RABe the Resource Block index of described initial position, f RABe the frequency domain index of the identical PRACH of each time-domain position,
Figure A20081013544400102
Expression rounds up.
Further, above-mentioned resource allocation methods can comprise that also the Resource Block index of described initial position is
Figure A20081013544400104
Figure A20081013544400105
Figure A20081013544400106
Figure A20081013544400107
Or
Wherein, n PRBoffset RABe the Resource Block index of described frequency domain initial position, N RB ULBe the pairing number of resource blocks of up-link bandwidth,
Figure A20081013544400109
Expression rounds up, Expression rounds downwards.
Further, above-mentioned resource allocation methods can comprise that also the frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
Compared with prior art, use the present invention, can guarantee not produce between PRACH and the PUCCH and interfere with each other, can guarantee that again the resource of PUSCH is not divided into multistage, and wherein can consider the maximum bandwidth of PUCCH.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the frame structure schematic diagram of LTE system TDD mode;
Fig. 2 is the frame structure schematic diagram of LTE system fdd mode;
Fig. 3 is a PRACH channel architecture schematic diagram;
Fig. 4 is the RB schematic diagram in the LTE system;
Fig. 5 is a PUCCH channel architecture schematic diagram;
Fig. 6 is the mapping method schematic diagram of present PRACH channel;
Fig. 7 is for using the position view of PRACH in the example one;
Fig. 8 is for using the position view of PRACH in the example two;
Fig. 9 is for using the position view of PRACH in the example three;
Figure 10 is for using the position view of PRACH in the example four.
Embodiment
Main design of the present invention is: during for Physical Random Access Channel PRACH Resources allocation, for the identical one or more PRACH of time-domain position, on frequency domain, be the center, the frequency domain resource of each PRACH alternately is mapped to the both sides of this initial position and guarantees that the frequency domain resource of each PRACH is continuous with a certain initial position.
The invention will be further described below in conjunction with the drawings and specific embodiments.
First execution mode:
When the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, be earlier downwards, upwards alternately shine upon again to described initial position both sides.Its mapping formulate is
Figure A20081013544400111
Wherein, n PRB RAResource Block index for the PRACH frequency domain initial position; n PRBoffset RAResource Block index for described initial position; f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A20081013544400112
Expression rounds up;
Figure A20081013544400113
Expression rounds downwards.
The frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
Second embodiment:
When the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, be earlier upwards, alternately shine upon downwards again to described initial position both sides.Its mapping formulate is
Figure A20081013544400114
Wherein, n PRB RAResource Block index for the PRACH frequency domain initial position; n PRBoffset RAResource Block index for described initial position; f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A20081013544400121
Expression rounds up;
Figure A20081013544400122
Expression rounds downwards.
The frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
In above-mentioned embodiment, frequency domain initial position can also be in the middle of the frequency band, promptly
Figure A20081013544400123
Or
Figure A20081013544400124
Or
Figure A20081013544400125
Or
Figure A20081013544400126
Or
Figure A20081013544400127
Or
Wherein, N RB ULBe the pairing RB number of up-link bandwidth.
In conjunction with the several application example the inventive method is described again below.
Use example one
Condition:
Suppose N RB UL = 50 ; The PRACH channel that time-domain position is identical has 4, i.e. f RA=0,1,2,3
On frequency domain, from the center, earlier downwards, what upwards replace shines upon to both sides again.The mapping formulate is
Figure A200810135444001210
N wherein PRBoffset RABe the frequency domain initial position of PRACH channel, and f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A200810135444001212
Expression rounds up;
Figure A200810135444001213
Expression rounds downwards.
F then RA=0,1,2, the index of first RB of the PRACH channel of 3 correspondences is respectively 25,19,31,13.Mapping result as shown in Figure 7.
Use example two
Condition:
Suppose N RB UL = 50 ; The PRACH channel that time-domain position is identical has 4, i.e. f RA=0,1,2,3
On frequency domain, from the center, upwards, what replace downwards shines upon to both sides again earlier.The mapping formulate is
Figure A200810135444001215
N wherein PRBoffset RABe the frequency domain initial position of PRACH channel, and
Figure A20081013544400131
f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A20081013544400132
Expression rounds up;
Figure A20081013544400133
Expression rounds downwards.
F then RA=0,1,2, the index of first RB of the PRACH channel of 3 correspondences is respectively 25,31,19,37.Mapping result as shown in Figure 8.
Use example three
Condition:
Suppose N RB UL = 6 ; The PRACH channel that time-domain position is identical has 1, i.e. f RA=0
On frequency domain, from the center, upwards, what replace downwards shines upon to both sides again earlier.The mapping formulate is
Figure A20081013544400135
N wherein PRBoffset RABe the frequency domain initial position of PRACH channel, and
Figure A20081013544400136
f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A20081013544400137
Expression rounds up;
Figure A20081013544400138
Expression rounds downwards.
F then RAThe index of first RB of the PRACH channel of=0 correspondence is 0.Mapping result as shown in Figure 9.
Use example four
Condition:
Suppose N RB UL = 15 ; The PRACH channel that time-domain position is identical has 2, i.e. f RA=0,1
On frequency domain, from the center, upwards, what replace downwards shines upon to both sides again earlier.The mapping formulate is
N wherein PRBoffset RABe the frequency domain initial position of PRACH channel, and f RAFrequency domain index for the identical PRACH channel of time-domain position;
Figure A200810135444001312
Expression rounds up;
Figure A200810135444001313
Expression rounds downwards.
F then RAThe index of first RB of the PRACH channel of=0,1 correspondence is 1,7.Mapping result as shown in figure 10.
Base station and terminal are distributed frequency domain resource by the result after calculating.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in technical scope disclosed in this invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (10)

1, a kind of resource allocation methods of Physical Random Access Channel comprises,
During for Physical Random Access Channel PRACH Resources allocation, for the identical one or more PRACH of time-domain position, on frequency domain, be the center, the frequency domain resource of each PRACH alternately is mapped to the both sides of this initial position and guarantees that the frequency domain resource of each PRACH is continuous with a certain initial position.
2, resource allocation methods as claimed in claim 1 is characterized in that,
When the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, be earlier upwards, alternately shine upon downwards again to described initial position both sides.
3, resource allocation methods as claimed in claim 2 is characterized in that,
The Resource Block index of each PRACH frequency domain initial position, calculate according to following formula:
Figure A2008101354440002C1
Wherein, n PRB RABe the Resource Block index of PRACH frequency domain initial position, f RABe the frequency domain index of the identical PRACH of time-domain position, n PRB offset RABe the Resource Block index of described initial position, Expression rounds up.
4, resource allocation methods as claimed in claim 1 is characterized in that,
When the frequency domain resource of each PRACH alternately is mapped to the both sides of described initial position, be earlier downwards, upwards alternately shine upon again to described initial position both sides.
5, resource allocation methods as claimed in claim 4 is characterized in that,
The Resource Block index of each PRACH frequency domain initial position calculates according to following formula,
Figure A2008101354440002C3
Wherein, n PRB RABe the Resource Block index of PRACH frequency domain initial position, f RABe the frequency domain index of the identical PRACH of time-domain position, n PRB offset RABe the Resource Block index of described initial position,
Figure A2008101354440002C4
Expression rounds up.
As the arbitrary described resource allocation methods of claim 1 to 5, it is characterized in that 6, the Resource Block index of described initial position is
Figure A2008101354440003C1
Figure A2008101354440003C2
Figure A2008101354440003C4
Or
Figure A2008101354440003C6
Wherein, n PRB offset RABe the Resource Block index of described frequency domain initial position, N RB ULBe the pairing number of resource blocks of up-link bandwidth,
Figure A2008101354440003C7
Expression rounds up,
Figure A2008101354440003C8
Expression rounds downwards.
7, as the arbitrary described resource allocation methods of claim 1 to 5, it is characterized in that,
The frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
8, a kind of resource allocation methods of Physical Random Access Channel comprises,
During for Physical Random Access Channel PRACH Resources allocation,, determine an initial position at frequency domain earlier, be calculated as follows the Resource Block index of each PRACH frequency domain initial position then for the identical one or more PRACH of time-domain position:
Figure A2008101354440003C9
Figure A2008101354440003C10
Wherein, n PRB RABe the Resource Block index of each PRACH frequency domain initial position, n PRB offset RABe the Resource Block index of described initial position, f RABe the frequency domain index of the identical PRACH of each time-domain position, Expression rounds up.
9, resource allocation methods as claimed in claim 8 is characterized in that,
The Resource Block index of described initial position is
Figure A2008101354440003C12
Figure A2008101354440003C13
Figure A2008101354440004C1
Figure A2008101354440004C2
Figure A2008101354440004C3
Or
Figure A2008101354440004C4
Wherein, n PRB offset RABe the Resource Block index of described frequency domain initial position, N RB ULBe the pairing number of resource blocks of up-link bandwidth,
Figure A2008101354440004C5
Expression rounds up,
Figure A2008101354440004C6
Expression rounds downwards.
10, resource allocation methods as claimed in claim 8 is characterized in that,
The frequency domain resource of each PRACH is that index is n PRB RA～n PRB RA6 Resource Block of+5.
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Cited By (7)

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CN102035780A (en) * 2009-09-25 2011-04-27 中兴通讯股份有限公司 Method and device for multiplexing physical uplink control channel
CN102598832A (en) * 2009-11-13 2012-07-18 株式会社Ntt都科摩 Wireless base station and mobile communication method
WO2012167524A1 (en) * 2011-06-09 2012-12-13 中兴通讯股份有限公司 Method and system for pusch resource scheduling
CN103634918A (en) * 2013-12-19 2014-03-12 武汉邮电科学研究院 Resource distribution method of transmission time interval (TTI) Bundling in long term evolution (LTE) system
WO2014114001A1 (en) * 2013-01-28 2014-07-31 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for uplink resource allocation
WO2020211050A1 (en) * 2019-04-18 2020-10-22 Zte Corporation Method and apparatus for random access procedure
CN112969242A (en) * 2018-07-27 2021-06-15 Oppo广东移动通信有限公司 Random access method, terminal equipment and storage medium

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CN101005308B (en) * 2006-01-17 2012-08-29 上海原动力通信科技有限公司 Physical layer random access method for broad band time division duplex mobile communication system
CN101179364B (en) * 2007-12-06 2011-11-30 中兴通讯股份有限公司 Transmitting method for accidental access channel in TDD system

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Publication number Priority date Publication date Assignee Title
CN102035780A (en) * 2009-09-25 2011-04-27 中兴通讯股份有限公司 Method and device for multiplexing physical uplink control channel
CN102035780B (en) * 2009-09-25 2014-11-05 中兴通讯股份有限公司 Method and device for multiplexing physical uplink control channel
CN102598832A (en) * 2009-11-13 2012-07-18 株式会社Ntt都科摩 Wireless base station and mobile communication method
WO2012167524A1 (en) * 2011-06-09 2012-12-13 中兴通讯股份有限公司 Method and system for pusch resource scheduling
WO2014114001A1 (en) * 2013-01-28 2014-07-31 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for uplink resource allocation
US9763234B2 (en) 2013-01-28 2017-09-12 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for uplink resource allocation
CN103634918A (en) * 2013-12-19 2014-03-12 武汉邮电科学研究院 Resource distribution method of transmission time interval (TTI) Bundling in long term evolution (LTE) system
CN103634918B (en) * 2013-12-19 2016-09-28 武汉邮电科学研究院 The resource allocation methods of TTI bundling in LTE system
CN112969242A (en) * 2018-07-27 2021-06-15 Oppo广东移动通信有限公司 Random access method, terminal equipment and storage medium
US11963226B2 (en) 2018-07-27 2024-04-16 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Random access method, terminal device, and network device
WO2020211050A1 (en) * 2019-04-18 2020-10-22 Zte Corporation Method and apparatus for random access procedure

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