CN110011773A - The data sending and receiving method of the random access procedure of network for wireless communication system - Google Patents
The data sending and receiving method of the random access procedure of network for wireless communication system Download PDFInfo
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- CN110011773A CN110011773A CN201811482857.6A CN201811482857A CN110011773A CN 110011773 A CN110011773 A CN 110011773A CN 201811482857 A CN201811482857 A CN 201811482857A CN 110011773 A CN110011773 A CN 110011773A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The embodiment of the invention discloses a kind of data receiver methods of the random access procedure of network for wireless communication system, comprising: the lead code and data of random access procedure are received from a message of the user equipment of wireless communication system；The lead code obtains timing-advance information based on the received；With the demodulated reference signal and timing advance compensation progress channel estimation for being demodulated to the reception data according to distribution, wherein timing advance compensation is to carry out linear phase rotation process in a frequency domain based on the timing-advance information.The data transmission and reception of 2 step RACH processes can be realized in the new radio of 5G (NR) by implementing the embodiment of the present invention.
Description
[technical field]
The present invention relates to wireless communication technology fields, more particularly, to the random access mistake of the network of wireless communication system
The data sending and receiving method of journey.
[background technique]
The random access channel (Random Access Channel, RACH) of long term evolution (LTE) system is used for original net
Network access and uplink temporal synchronization.It is different from 4 traditional step RACH processes, in the 3GPP standards meetings of 5G by discussion
2 step RACH processes.Note that compared with 4 step RACH processes in LTE, the 2 step RACH processes simplified reduce signaling overheads and
Transmission latency.
Referring to FIG. 1, it is the schematic diagram of 2 step RACH processes.In the first step, user equipment (UE) is by lead code
(preamble) network (that is, using message Msg 1) is sent collectively to together with RACH data.In the second step, UE is from network
Receiving includes the preamble index detected, UE mark, and the RACH response of timing advance (Timing Advance, TA) is (that is, utilize
Message Msg 2).In other words, 2 step RACH processes allow UE to send lead code and data on RACH, and 4 step RACH processes permit
Perhaps UE only sends lead code on RACH.As a result, 2 step RACH processes are conducive to small packet uplink transmission.
However, not for the physical channel design specification of 2 step RACH processes.In detail, do not consider to use in LTE specification
The demodulated reference signal (Demodulation Reference Signal, DMRS) of RACH data transmission in message Msg 1
Distribution and fate (numerology)/format (format).Therefore, network cannot during 2 step RACH extraction/decoding from UE
Received RACH data.
[summary of the invention]
The present invention is provided to the data sending and receiving methods of the random access procedure of the network of wireless communication system, can
The data transmission and reception of 2 step RACH processes are realized in the new radio of 5G (NR).
The present invention provides a kind of data receiver method of the random access procedure of network for wireless communication system, packet
It includes: receiving the lead code and data of random access procedure from a message of the user equipment of wireless communication system；According to connecing
The lead code received obtains timing-advance information；Believe with according to the demodulation reference for being demodulated to the reception data of distribution
Number and timing advance compensation carry out channel estimation, wherein the timing advance compensation be based on the timing-advance information in a frequency domain
Carry out linear phase rotation process.
The present invention provides a kind of data transmission method of the random access procedure of user equipment for wireless communication system,
It include: at least in frequency resource and time resource in a manner of code division multiplexing and the demodulated reference signal sequence of configuration, random
Lead code and data are sent to the network of wireless communication system in one message of access procedure；Wherein, the demodulation ginseng of the configuration
Examine the propagation delay that signal sequence does not consider rach data transmission.
From the foregoing, it will be observed that technical solution of the present invention can realize the data of 2 step RACH processes in the new radio of 5G (NR)
It sends and receives.
[Detailed description of the invention]
Fig. 1 is the schematic diagram of 2 step RACH processes.
Fig. 2 shows the schematic diagrames of exemplary communication device 20.
Fig. 3-Fig. 4 shows the fate and format of the RACH data according to the disclosure.
Fig. 5 is the flow chart according to the exemplary process 50 of the disclosure.
Fig. 6 is shown to be reduced according to the DMRS density using TA compensating operation of the disclosure.
Fig. 7 is shown for channel estimation process of the invention.
Fig. 8-Fig. 9 shows the configuration principle of DRMS sequence according to the disclosure.
Figure 10 has marked the fate and format of the RACH data according to the disclosure.
[specific embodiment]
Some vocabulary is used in the specification and claims to censure specific component.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims not with
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Logical
The "comprising" and " comprising " of specification and claim mentioned in are an open term, thus should be construed to " include
But it is not limited to "." generally " refer within an acceptable error range, those skilled in the art can be in certain error range
Interior solution the technical problem, basically reaches the technical effect.In addition, " coupling " word includes any directly and indirect herein
Means of electrical connection.Therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can
It is directly electrically connected at the second device, or is electrically connected to second dress indirectly by other devices or connection means
It sets.The preferred mode of the invention for implementation as described below, it is therefore intended that illustrate spirit of the invention rather than to limit the present invention
Protection scope, protection scope of the present invention when view appended claims institute defender subject to.
It connects and following is described as optimum embodiment expected from the present invention.These descriptions are for illustrating substantially principle of the invention
And it is not applied to the limitation present invention.Protection scope of the present invention should be recognized on the basis of reference claim of the invention
It is fixed.
Fig. 2 shows the schematic diagrames of exemplary communication device 20.Communication equipment 20 can be network (for example, base station) or use
Family equipment (UE), such as wearable device, IoT equipment, mobile phone, utensil, machine type equipment etc., with the new nothing of LTE or 5G
Line electricity (NR) specification compatibility.Communication equipment 20 may include processing unit 200, such as processor, specific integrated circuit (ASIC)
Deng storage unit 210 and communications interface unit 220.Storage unit 210 can be any data storage device that can store.
Program code 214 corresponds to processing, and unit 200 for processing accesses.Processing unit 200 may be coupled to storage unit 210, uses
In processing routine code 214 to execute processing.The example of storage unit 210 includes but is not limited to read-only memory (ROM), is dodged
It deposits, random access memory (RAM), CD-ROM, tape, hard disk and optical data storage.Communications interface unit 220 can be with
It is radio transceiver, and wireless signal can be exchanged according to the processing result of processing unit 200.
Referring back to Fig. 1, in Fig. 1, UE not only sends RACH lead code by the message Msg 1 of 2 step RACH processes
And send RACH data.RACH data are transmitted, UE use cyclic prefix (Cyclic identical with RACH lead code
Prefix, CP) and guard time (Guard Time, GT).In short, UE with Physical Random Access Channel (Physical
Random Access Channel, PRACH) in the identical fate of RACH lead code and format send RACH data.In addition,
The subcarrier spacing (Subcarrier Spacing, SCS) of RACH data is identical or different with RACH lead code.
Fig. 3-Fig. 4 shows the fate and format of the RACH data according to the disclosure.In one embodiment, UE1 and UE2
RACH lead code and RACH data are sent to base station BS respectively.UE1 is in center of housing estate and UE2 is in cell edge, therefore
Base station BS than from UE2 RACH lead code and RACH data receive RACH lead code and RACH data from UE1 earlier.Such as figure
Shown in 3, RACH data have SCS, CP and GT identical with RACH lead code, to support the RACH data under asynchronous scene to pass
It is defeated.That is, i.e. UE not yet receives RACH response, UE and network difference from network because 2 step RACH processes are not yet completed
Step.On the other hand, in Fig. 4, RACH has the SCS different from RACH lead code, but having the same with RACH lead code
CP and GT.
Referring to FIG. 5, it is the flow chart according to the exemplary process 50 of the disclosure.Process 50 can be used in the net of Fig. 2
RACH data receiver is used in network.Process 50 can be compiled into program code 214, be stored in storage unit 210, single for processing
Member 200 is handled, comprising the following steps:
Step 500: starting.
Step 510: (for example, passing through one single message of detection) receives the RACH of 2 step random access procedures from UE simultaneously
Lead code and RACH data.
Step 520: timing-advance information is obtained according to the RACH lead code received.
Step 530: being compensated according to the DMRS and timing advance being assigned as being demodulated to the RACH data received
Carry out channel estimation, wherein timing advance compensation is the linear phase rotation process in the frequency domain generated by timing advance.
Step 540: terminating.
According to process 50, network not merely with DMRS Sequence Estimation channel, also using timing advance (TA) compensating operation come
Estimate channel.In detail, due to 2 step RACH processes, UE sends RACH data in asynchronous scene.Therefore, RACH data are transmitted
Total channel delay include propagation delay (that is, timing advance) and multipath delay spread.Accurate channel estimation is used in order to cover
Total channel delay, network needs more DMRS to distribute in frequency resource, i.e., high DMRS density.However, in frequency resource
High DMRS density leads to expense.It is compensated using TA of the invention, timing advance can be restored, therefore total channel delay only includes more
Diameter delay extension.Therefore, network needs less DMRS to distribute for channel estimation in frequency resource, close to reduce DMRS
Degree and uplink DMRS expense.
Referring to Fig. 6, it illustrates the DMRS density reductions using TA compensating operation according to the disclosure.As shown in fig. 6, different
CP length in the case of step is 0.1ms, i.e. multipath delay spread tolerance is up to 0.1ms.As described above, total in asynchronous scene
Channel latency includes that timing advance adds multipath delay spread, is the maximum value of 4.7us (that is, in traditional data transmission synchronization
CP length is 4.7us in scene).Due to longer time delay, i.e. CP=100us, network (i.e. base station) needs in frequency resource
Higher DMRS density carries out channel estimation, it means that frequency resource is occupied by DMRS, it is impossible to be used in the transmission of RACH data, because
This reduces system performance.
On the other hand, the present invention proposes TA compensating operation to restore a part of propagation delay, i.e. timing advance part.Cause
This, channel latency only retains multipath delay spread part, i.e. CP=4.7us.Therefore, network needs lower in frequency resource
DMRS density is to be used for channel estimation.In addition, DRMS expense can be reduced to 0.5875% from 12.5%.In detail, TA is compensated
It is completed by adjoint RACH lead code.Network knows timing advance by RACH lead code, then uses the timing-advance information
Compensation phase is generated for the linear phase rotator in frequency domain, is expressed as following formula:
Theta (k)=ta_phase*k, k are carrier index；
Ta_phase is estimated from RACH lead code.
In addition, referring to FIG. 7, showing for channel estimation process of the invention.UE is in the time-frequency money distributed by network
RACH lead code and RACH data are sent in source.After receiving RACH lead code, network obtains the inspection for each corresponding to UE
The TA value of the RACH lead code measured.Meanwhile network is the one of Physical Resource Block (Physical Resource Block, PRB)
The RACH data with DMRS are received in a little carrier wave, execute least mean-square error (MMSE) channel estimation then to be had
The channel (that is, to tilt the channel of wire tag) of the DMRS of distribution.After obtaining channel and TA value, RRB of the network to acquisition
Subcarrier channel execute TA compensating operation " theta (k) ".Therefore, the channel of no timing advance delay is obtained, then net
Network carries out channel estimation in frequency domain based on the channel that no timing advance postpones, to obtain accurate channel estimation results.
In addition, designing for DMRS, the present invention provides one kind to pass through code division multiplexing (Code-Division
Multiplexing, CDM), frequency division multiplexing (Frequency-Division Multiplexing, FDM), time division multiplexing
(Time-Division Multiplexing, TDM) or these three any modes combine to extend the method for DMRS capacity.?
In traditional LTE system, 12 DMRS sequences based on CDM in a PRB are up to 12 RE (Resource
Element) (that is, DMRS is multiplexed in a manner of CDM by ZC class sequence).Network can be by the structure and the DMRS based on 12 CDM
Sequence reuses (reuse) together, creates 12 additional DMRS sequences in a manner of FDM to use.As shown in figure 8, can be used 24
A DMRS sequence, therefore network can distribute DMRS13-DMRS 24 in next PRB in frequency resource.Similarly, such as
Shown in Fig. 9, which can be used together by network with 12 DMRS sequences based on CDM, by use create in a manner of TDM it is additional
12 DMRS sequences.For example, network can distribute DMRS13-DMRS24 in next OFDM symbol in time resource.
Note that as shown in Figure 10, if UE knows timing-advance information when executing 2 step RACH process, UE by with
Identical fate and format in physical uplink shared channel (Physical Uplink Shared Channel, PUSCH)
Uplink data is sent, because UE is synchronous with network.That is, data transmission should use it is identical with PUSCH
CP (such as CP=4.7us), SCS and GT, rather than PRACH.In addition, the data transmission that UE is optimization removes targeting signal.
Process/operation above-mentioned steps including proposed steps can be by hardware, and the mode of software or firmware is realized,
The firmware as in hardware device, computerinstruction and hardware device or electronic system as the soft of read-only resident data
The combination of part.The example of hardware may include referred to as microcircuit, the simulation of microchip or silicon chip, fate and hybrid circuit.Electricity
The example of subsystem may include system on chip (SOC), system in package (SiP), and the calculator (COM) and communication in module are set
Standby 20.
In short, the present invention is designed for the DMRS of 2 step RACH processes, dropped especially for DMRS configuration extension and DMRS density
It is low.In addition, the present invention provides the fates and format of the transmission of RACH data.Therefore, 2 can be realized in the new radio of 5G (NR)
Walk the data transmission and reception of RACH process.
In some embodiments, term " about " and " substantially " can be used to indicate that ± the 10% of target value at " about "
Within.Term " about ", " about " and " substantially " may include target value.Should be appreciated that term " about ", " about " and
" substantially " it can be used for referring to ± 10% range for being less than target value, such as: ± the 5% of target value, ± 2.5% target value
± 1%, ± the 1% of target value.
Such as " first " is used in the claims, " second ", the ordinal term of " third " etc., which carrys out modification right, to be wanted
Element is not meant to a claim elements prior to any priority of another or time, priority or suitable in itself
Sequence.The sequence of the behavior of execution method, but label is used only as so that will there is specific names claim element and have
Another element (but for using ordinal term) of same names is distinguished, to distinguish claim element.
Though the present invention is disclosed above in the preferred embodiment, the range that however, it is not to limit the invention, any this field
Technical staff, without departing from the spirit and scope of the present invention, when can do a little change and retouching, therefore protection of the invention
Range is subject to view as defined in claim.
Claims (8)
1. a kind of data receiver method of the random access procedure of the network for wireless communication system characterized by comprising
The lead code and data of random access procedure are received from a message of the user equipment of wireless communication system；
The lead code obtains timing-advance information based on the received；With
Channel is carried out according to the demodulated reference signal for being used to demodulate the reception data and the timing advance compensation of distribution to estimate
Meter, wherein timing advance compensation is to carry out linear phase rotation process in a frequency domain based on the timing-advance information.
2. the method according to claim 1, wherein according to distribution for being demodulated to the reception data
Demodulated reference signal and timing advance compensation carry out channel estimation and include:
The channel of estimation is obtained by the demodulated reference signal；With
Pass through the channel of the channel of the estimation and timing advance compensating operation estimation carrying data.
3. the method as described in claim 1, which is characterized in that further include:
The demodulated reference signal sequence being allocated in resource is at least configured in a manner of code division multiplexing in time resource and frequency resource
Column.
4. the method according to claim 1, wherein from a message of the user equipment of wireless communication system
The lead code and data for receiving the random access procedure include:
Receive have identical with Physical Random Access Channel fate and format data, wherein the cyclic prefix of the data with should
The cyclic prefix of lead code is identical, and the subcarrier spacing of the data and the subcarrier spacing of the lead code are identical or different.
5. the method as described in claim 1, which is characterized in that further include:
When the user equipment and the Network Synchronization, only receiving has fate identical with physical uplink shared channel and lattice
The data of formula.
6. a kind of data transmission method of the random access procedure of the user equipment for wireless communication system, which is characterized in that
Include:
At least in frequency resource and time resource in a manner of code division multiplexing and the demodulated reference signal sequence of configuration, connecing at random
Enter in a message of process and sends lead code and data to the network of wireless communication system；
Wherein, the demodulated reference signal sequence of the configuration does not consider the propagation delay of rach data transmission.
7. method as claimed in claim 6, which is characterized in that the data with fate identical with Physical Random Access Channel and
Format send, the cyclic prefix of the data and the cyclic prefix of the lead code are identical, and the subcarrier spacing of the data and this
The subcarrier spacing of lead code is identical or different.
8. method as claimed in claim 6, which is characterized in that further include:
When the user equipment and the Network Synchronization, only sending has fate identical with physical uplink shared channel and lattice
The data of formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111265548.5A CN114039712A (en) | 2018-01-04 | 2018-12-05 | Data transmission and reception method for random access procedure of network of wireless communication system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/861,687 US10313158B2 (en) | 2017-01-09 | 2018-01-04 | Method for data transmission and reception of random access procedure |
| US15/861,687 | 2018-01-04 |
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| CN202111265548.5A Division CN114039712A (en) | 2018-01-04 | 2018-12-05 | Data transmission and reception method for random access procedure of network of wireless communication system |
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| CN110011773A true CN110011773A (en) | 2019-07-12 |
| CN110011773B CN110011773B (en) | 2021-11-26 |
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| CN201811482857.6A Active CN110011773B (en) | 2018-01-04 | 2018-12-05 | Data transmission and reception method for random access procedure of network of wireless communication system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112584496A (en) * | 2019-09-27 | 2021-03-30 | 维沃移动通信有限公司 | Resource using method and communication equipment |
| WO2021063323A1 (en) * | 2019-09-30 | 2021-04-08 | 中兴通讯股份有限公司 | Random access method and device, and first communication node and second communication node |
| WO2021168702A1 (en) * | 2020-02-26 | 2021-09-02 | Oppo广东移动通信有限公司 | Random access method, network device, and terminal device |
| CN115152309A (en) * | 2020-02-24 | 2022-10-04 | 高通股份有限公司 | Random access channel transmission procedure in higher frequency bands |
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| SAMSUNG: "Basic channel structure for grant-free based multiple access，R1-1612572", 《3GPP TSG RAN WG1 MEETING #87》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112584496A (en) * | 2019-09-27 | 2021-03-30 | 维沃移动通信有限公司 | Resource using method and communication equipment |
| WO2021057902A1 (en) * | 2019-09-27 | 2021-04-01 | 维沃移动通信有限公司 | Method for using resource and communication device |
| CN112584496B (en) * | 2019-09-27 | 2023-06-30 | 维沃移动通信有限公司 | Resource using method and communication equipment |
| WO2021063323A1 (en) * | 2019-09-30 | 2021-04-08 | 中兴通讯股份有限公司 | Random access method and device, and first communication node and second communication node |
| CN115152309A (en) * | 2020-02-24 | 2022-10-04 | 高通股份有限公司 | Random access channel transmission procedure in higher frequency bands |
| WO2021168702A1 (en) * | 2020-02-26 | 2021-09-02 | Oppo广东移动通信有限公司 | Random access method, network device, and terminal device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI676402B (en) | 2019-11-01 |
| CN110011773B (en) | 2021-11-26 |
| TW201931929A (en) | 2019-08-01 |
| CN114039712A (en) | 2022-02-11 |
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