CN106793146B - The method of user terminal and its random access - Google Patents
The method of user terminal and its random access Download PDFInfo
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- CN106793146B CN106793146B CN201610957691.3A CN201610957691A CN106793146B CN 106793146 B CN106793146 B CN 106793146B CN 201610957691 A CN201610957691 A CN 201610957691A CN 106793146 B CN106793146 B CN 106793146B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
A kind of method of user terminal and its random access.The method includes：The information of the time/frequency source block for random access is obtained from preset physical layer resources information, wherein the preset physical layer resources information includes：Identification information of the two or more for the time/frequency source block of random access and the data transmission parameters in each time/frequency source block, described two above time/frequency source blocks for random access are not overlapped in time domain or frequency domain；Using the information of the time/frequency source block for random access got, corresponding leading symbol sequence and the data information for random access are sent to base station, random access detection is carried out according to the preset physical layer resources information by the base station.Using said program, the signaling overheads in random access procedure can be saved.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of method of user terminal and its random access.
Background technology
In long term evolution (Long Term Evolution, LTE) system, base station can be user terminal (UE) distribution with
Machine accesses channel (Random Access Channel, RACH) physical layer resources, and UE utilizes the RACH physical layers that base station is distributed
Resource, used leading symbol (Preamble) sequence is sent to base station when will be used for contention access, and base station is based on
Preamble sequences send corresponding response message to UE.Then, UE sends RRC connection request to base station, by base station according to RRC
Connection request establishes RRC connections.
However, the signaling overheads in above-mentioned random access procedure is larger.
Invention content
The problem to be solved in the present invention is the signaling overheads how saved in random access procedure.
To solve the above problems, an embodiment of the present invention provides a kind of method of user terminal random access, the method
Including：The information of the time/frequency source block for random access is obtained from preset physical layer resources information, wherein described default
Physical layer resources information include：The identification information of time/frequency source block for random access and each time/frequency source block
On data transmission parameters, the time/frequency source block for random access is more than two and do not weighed in time domain or frequency domain
It is folded；Using the information of the time/frequency source block for random access got, by corresponding leading symbol sequence and for random
The data information of access is sent to base station, and random access inspection is carried out according to the preset physical layer resources information by the base station
It surveys, the data information for random access includes the identification information of the user terminal.
Optionally, the preset physical layer resources information is obtained from the system message that base station is sent.
Optionally, the preset physical layer resources information is stored in advance in the user terminal.
Optionally, the information for obtaining the time/frequency source block for random access, including：It is used for according to what base station was sent
The instruction information of the physical layer resources of random access obtains and the instruction information from the preset physical layer resources information
The information of corresponding multiple time/frequency source blocks；Institute is obtained from the information of multiple time/frequency source blocks corresponding with the instruction information
State the information of the time/frequency source block for random access.
Optionally, the physical layer resources information obtained for random access, including：According to current channel conditions and institute
The data volume for stating the data information for random access obtains described for random from the preset physical layer resources information
The information of the time/frequency source block of access.
Optionally, the data transmission parameters in each time/frequency source block, including following at least one：It can carry
The length of data information；The coding mode for carrying data information；The modulation system for carrying data information；It is described
The diversity mode of data information can be carried.
The embodiment of the present invention additionally provides a kind of user terminal, and the user terminal includes：Acquiring unit is suitable for from default
Physical layer resources information in obtain the information of time/frequency source block for random access, wherein the preset physical layer money
Source information includes：Data on the identification information of time/frequency source block for random access and each time/frequency source block pass
Defeated parameter, the time/frequency source block for random access are more than two and are not overlapped in time domain or frequency domain；Access unit,
Suitable for utilizing the information of the time/frequency source block for random access got, by corresponding leading symbol sequence and for random
The data information of access is sent to base station, and random access inspection is carried out according to the preset physical layer resources information by the base station
It surveys, the data information for random access includes the identification information of the user terminal.
Optionally, the preset physical layer resources information is obtained from the system message that base station is sent.
Optionally, the preset physical layer resources information is stored in advance in the user terminal.
Optionally, the acquiring unit includes：First obtains subelement, is suitable for being used for random access according to what base station was sent
Physical layer resources instruction information, from the preset physical layer resources information obtain it is corresponding more with the instruction information
The information of a time/frequency source block；Second obtains subelement, is suitable for from multiple time/frequency source blocks corresponding with the instruction information
The information of the time/frequency source block for random access is obtained in information.
Optionally, the acquiring unit is suitable for according to current channel conditions and the data information for random access
Data volume obtains the information of the time/frequency source block for random access from the preset physical layer resources information.
Optionally, the data transmission parameters in each time/frequency source block, including following at least one：It can carry
The length of data information；The coding mode for carrying data information；The modulation system for carrying data information；It is described
The diversity mode of data information can be carried.
Compared with prior art, the technical solution of the embodiment of the present invention has the following advantages：
Using the above scheme, since the preset physical layer resources information includes the time/frequency source block for random access
Identification information and each time/frequency source block on data transmission parameters, and the running time-frequency resource for random access
Block is two or more, therefore user terminal can be obtained for random in random access from predetermined physical layer resource information
The information of the time/frequency source block of access, therefore the Adaptive Modulation of user data may be implemented.Also, user terminal is sent out to base station
Send leading symbol sequence and for random access data information while, can implicitly to base station transmit random access channel
The configured transmission of middle data, so as to reduce the complexity of base station blind examination.
Description of the drawings
Fig. 1 is a kind of method flow diagram of user terminal random access in the embodiment of the present invention；
Fig. 2 is a kind of running time-frequency resource of each time/frequency source block in preset physical layer resources information in the embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of structural schematic diagram of user terminal in the embodiment of the present invention.
Specific implementation mode
Cannot include data information in LTE system, in the signaling due to sending Preamble sequences, UE is carried out
When random access, Preamble sequences, then the response based on base station first usually are sent to base station, sending RRC connections to base station asks
It asks, to carry out random access.Wherein, it is generally comprised in RRC connection request for establishing the data information needed for random access.
That is in above-mentioned random access procedure, UE need respectively by individual signaling to base station send Preamble sequences with
And for the data information needed for random access.
The signaling of transmission Preamble sequences is being studied in 5th third generation mobile communication network (5G) can carry user's end
Hold ID, while base station for should user terminal ID responded, it is possible thereby to simplify random access procedure Signalling exchange.
But in practical applications, the data information needed for random access is changeable, and differences in channel conditions is also very big,
If continuing to use fixed and single RACH physical layer resources in 5G, the Adaptive Modulation of user data can not be directly realized by.
In order to realize the Adaptive Modulation of user data or need to be indicated by additional signaling, thus may
The set of the optional Preamble sequences of user terminal can be reduced, and increases the overhead of user data；Do not use volume
Outer signaling is indicated, but can increase the complexity of base station blind examination.
In view of the above-mentioned problems, the embodiment provides a kind of methods of user terminal random access, by advance
Physical layer resource information is set, since the preset physical layer resources information includes the time/frequency source block for random access
Data transmission parameters on identification information and each time/frequency source block, and the time/frequency source block for random access
For two or more, therefore user terminal can be obtained for connecing at random in random access from predetermined physical layer resource information
The information of the time/frequency source block entered, therefore the Adaptive Modulation of user data may be implemented.Also, user terminal is sent to base station
Leading symbol sequence and for random access data information while, can implicitly to base station transmit random access channel in
The configured transmission of data, so as to reduce the complexity of base station blind examination.
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment explain in detail.
Referring to Fig.1, an embodiment of the present invention provides a kind of method of user terminal random access, the method may include
Following steps：
Step 11, the information of the time/frequency source block for random access is obtained from preset physical layer resources information.
Wherein, the preset physical layer resources information may include：The mark of time/frequency source block for random access
Data transmission parameters in information and each time/frequency source block, the time/frequency source block for random access are two
It is not overlapped above and in time domain or frequency domain.
In specific implementation, it according to the identification information of the time/frequency source block for random access, can obtain unique
The time/frequency source block for random access.Wherein, the concrete form of the identification information is unrestricted, for example, can pass through
The identification information of OFDM symbol identifies the time-domain resource that the time/frequency source block occupies in subframe numbers and subframe, is accorded with by OFDM
The identification information of subcarrier identifies the frequency domain resource that the time/frequency source block occupies in number.Under normal conditions, the time-frequency money
The time-domain resource that source block occupies is continuous several OFDM symbols in a certain subframe, and the frequency domain resource of occupancy is described continuous several
Several continuous subcarriers in OFDM symbol.
In specific implementation, the data transmission parameters in the time/frequency source block may include a variety of, for example, the time-frequency
Data transmission parameters on resource block can be the length that can carry data information, the coding staff for carrying data information
Formula, the modulation system for carrying data information or the diversity mode for carrying data information, can also be more than
Two or more arbitrary combination in data transmission parameters according to the regulation of communication protocol and described can specifically be held
The attribute for carrying data information is selected.For example, when the length that communication protocol acquiescence can carry data information is 40bytes,
Then it need not include the length that can carry data information in the data transmission parameters in the time/frequency source block.Believe when data can be carried
Breath need not be when being sent by way of diversity, then need not be comprising can carry number in the data transmission parameters in the time/frequency source block
It is believed that the diversity mode of breath.
For example, the preset physical layer resources information may include tri- time-frequency moneys of PRACH1, PRACH2 and PRACH3
Source block, the data transmission parameters in each time/frequency source block are as shown in table 1.
Specifically, the length that data information can be carried in PRACH1 is 40bytes, and coding mode is low-density checksum
Code (Low Density Parity Check Code, LDPC) coding, modulation system are quadrature phase shift keying (Quadrature
Phase Shift Keyin, QPSK), diversity mode is frequency diversity.The length that data information can be carried in PRACH2 is
20bytes, coding mode encode for double-byte encodings character (two byte code character, TBCC), and modulation system is
Quadrature amplitude modulation (16Quadrature AMP1620084litude Modulation, 16QAM).Number can be carried in PRACH3
It is believed that the length of breath is 20bytes, coding mode encodes for TBCC, modulation system QPSK.
Reference Fig. 2,Indicate the occupied running time-frequency resources of PRACH1,It indicates occupied by PRACH2
Running time-frequency resource,Indicate the occupied running time-frequency resources of PRACH3.Tri- time-frequencies of PRACH1, PRACH2 and PRACH3
Resource block respectively occupies different running time-frequency resources.Figure it is seen that occupied by two time/frequency source blocks of PRACH2 and PRACH3
Time-domain resource it is identical, but frequency domain resource is different.PRACH1 and PRACH2 and PRACH1 and PRACH3, occupied frequency domain
Resource part is overlapped, but time-domain resource is different.
In specific implementation, the source of the preset physical layer resources information may exist various ways, not make specifically
Limitation, as long as base station and UE can obtain the preset physical layer resources information.
In one embodiment of this invention, base station can configure the preset physical layer resources information, and lead to
It crosses system message and is sent to UE.UE can be obtained described default after receiving system message from the system message received
Physical layer resources information.Wherein, it is not restricted for sending the preset physical layer resources information, for example can be physics
Layer synchronizing signal PSS/SSS, or physical layer broadcast channel PBCH can also be system information SI.
In another embodiment of the invention, the preset physical layer resources information can be stored in advance in the UE.
That is, under default situations, UE stores the preset physical layer resources information.At this point, when UE initiates random access, only
The information of the time/frequency source block for random access need to be obtained from the preset physical layer resources information stored,
And the preset physical layer resources information need not be obtained by modes such as system messages, to save corresponding signaling overheads.
In specific implementation, the source regardless of the preset physical layer resources information, may be used a variety of sides
Formula obtains the information of the time/frequency source block for random access.
For example, the preset physical layer resources information can include multiple physical layer resources information tables, every physical layer
Resource information table includes the identification information of multiple time/frequency source blocks for random access and corresponding data transmission parameters.This
When, the base station can send the instruction information of the physical layer resources for random access to UE in advance, be believed by the instruction
Breath specifies a wherein physical layer resources information table.When the finger for the physical layer resources for random access for receiving base station transmission
When showing information, UE can determine the physical layer resources information table for being currently used in random access, also determined that and be currently used at random
The information of multiple time/frequency source blocks of access, and then from the letter of the identified multiple time/frequency source blocks for being currently used in random access
In breath, the information of the time/frequency source block for random access is obtained.
Certainly, the preset physical layer resources information can also only include a physical layer resources information table, at this time without
The information for the multiple time/frequency source blocks for being currently used in random access must be determined by the instruction information of base station, directly from described default
Physical layer resources acquisition of information described in for random access time/frequency source block information.
In specific implementation, when the preset physical layer resources information only includes a physical layer resources information table,
UE can be according to the data volume of current channel conditions and the data information for random access, from the preset physical layer
The information of the time/frequency source block for random access is obtained in resource information.When the preset physical layer resources packet
Containing multiple physical layer resources information tables, the multiple time-frequencies for being currently used in random access are determined in the instruction information sent according to base station
After the information of resource block, UE can according to the data volume of current channel conditions and the data information for random access, from
In the information of the identified multiple time/frequency source blocks for being currently used in random access, obtains the time-frequency for random access and provide
The information of source block.
For example, when including PRACH1, PRACH2 and PRACH3 tri- shown in table 1 in the preset physical layer resources information
When a time/frequency source block, when UE is detected by downlink determines that current channel conditions are general, if the UE is used for the number of random access
It is believed that breath data volume it is larger, then can select PRACH1 be used as random access time/frequency source block, if the UE for
The data volume of the data information of machine access is smaller, then PRACH3 can be selected as the time/frequency source block for random access.UE
When determining that current channel conditions are preferable by downlink detection, then PRACH2 can be selected as the running time-frequency resource for random access
Block.
| PRACH1 | PRACH2 | PRACH3 | |
| Data length | 40bytes | 40bytes | 20bytes |
| Coding mode | LDPC | TBCC | TBCC |
| Modulation system | QPSK | 16QAM | QPSK |
| Diversity mode | Frequency diversity | Nothing | Nothing |
Table 1
It should be noted that in specific implementation, one can be obtained only from preset physical layer resources information and be used for
The information of the time/frequency source block of random access can also obtain the information of multiple time/frequency source blocks for random access, specifically
It is not restricted.
Step 12, using the information of the time/frequency source block for random access got, by corresponding leading symbol sequence
Row and the data information for random access be sent to base station, by the base station according to the preset physical layer resources information into
Row random access detects.
In specific implementation, after the information of the time/frequency source block for random access got, according to for connecing at random
The data transmission parameters in time/frequency source block entered lead to corresponding leading symbol sequence and the data information for random access
It crosses the time/frequency source block for random access and is sent to base station.Wherein, the data information for random access is at least
Include the identification information of the UE, it is, of course, also possible to comprising other data informations, for example, certain scheduling request informations etc. of UE.
It base station, can be according to described for random access when receiving the time/frequency source block for being used for random access
Data transmission parameters in time/frequency source block carry out Multiuser Detection, to obtain the time/frequency source block institute for being used for random access
The leading symbol sequence of carrying and the data information for random access.Since base station can obtain the preset physical layer money
Source information, therefore signaling that need not be additional indicates, and the blind examination complexity of base station can be reduced.
By the above content it is found that using user terminal accidental access method described in the embodiment of the present invention, by setting
Physical layer resource information is set, and the preset physical layer resources information includes that more than two time-frequencies for random access provide
Data transmission parameters on the identification information of source block and each time/frequency source block, therefore UE is in random access, can be with
The information of the time/frequency source block for random access is obtained from predetermined physical layer resource information, therefore user data may be implemented
Adaptive Modulation.Also, user terminal is same the data information to base station transmission leading symbol sequence and for random access
When, the data transmission parameters that can be used for implicitly to base station transmission in the time/frequency source block of random access, and need not be additional
Signaling designation date configured transmission, to which while saving signaling overheads, the complexity of base station blind examination can be reduced.
In order to make those skilled in the art more fully understand and realize the present invention, below by way of specific embodiment to above-mentioned use
The method of family terminal random access is described in detail.
With reference to Fig. 3, the embodiment of the present invention additionally provides a kind of UE 30, and the UE 30 may include：Acquiring unit 31 with
And access unit 32.Wherein：
The acquiring unit 31 is suitable for obtaining the running time-frequency resource for random access from preset physical layer resources information
The information of block, wherein the preset physical layer resources information includes：Two or more is used for the time/frequency source block of random access
The configured transmission of identification information and each time/frequency source block, described two above time/frequency source blocks for being used for random access
It is not overlapped in time domain or frequency domain；
The access is 32 yuan single, will be corresponding suitable for utilizing the information of the time/frequency source block for random access got
Leading symbol sequence and data information for random access be sent to base station, by the base station according to the preset physics
Layer resource information carries out random access detection, and the data information for random access includes that the mark of the user terminal is believed
Breath.
In one embodiment of this invention, the preset physical layer resources information is from the system message that base station is sent
It obtains.
In another embodiment of the present invention, the preset physical layer resources information is to be stored in advance in user's end
End.
In one embodiment of this invention, the acquiring unit 31 may include：It first acquisition subelement 311 and second obtains
Subelement 312 is taken, wherein：
Described first obtains subelement 311, the finger for the physical layer resources for random access for being suitable for being sent according to base station
Show information, the letter of multiple time/frequency source blocks corresponding with the instruction information is obtained from the preset physical layer resources information
Breath；
Described second obtains subelement 312, is suitable for the information from multiple time/frequency source blocks corresponding with the instruction information
Information described in middle acquisition for the time/frequency source block of random access.
In specific implementation, the acquiring unit 31 is suitable for according to current channel conditions and the number for random access
It is believed that the data volume of breath, obtains the time/frequency source block for random access from the preset physical layer resources information
Information.
In specific implementation, the data transmission parameters in the time/frequency source block can only include that can carry data information
Length, the coding mode for carrying data information or described carry the modulation system for carrying data information
The diversity mode of data information can also include the combination of above two or two or more data transmission parameters, specific unrestricted
System.
As shown in the above, the UE 30 in the embodiment of the present invention, by being obtained from preset physical layer resources information
The information of time/frequency source block for random access may be implemented the Adaptive Modulation of user data, and can not increase
In the case of additional signaling overhead, the blind examination complexity of base station is reduced.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (10)
1. a kind of method of user terminal random access, which is characterized in that including：
User terminal obtains the information of the time/frequency source block for random access from preset physical layer resources information, wherein
The preset physical layer resources information includes：The identification information of time/frequency source block for random access and it is each described when
Data transmission parameters on frequency resource block, the time/frequency source block for random access are more than two and in time domain or frequency domains
On be not overlapped；
The user terminal utilizes the information of the time/frequency source block for random access got, by corresponding leading symbol sequence
Row and the data information for random access be sent to base station, by the base station according to the preset physical layer resources information into
Row random access detects, and the data information for random access includes the identification information of the user terminal；
Wherein, the data transmission parameters in each time/frequency source block, including following at least one：Data letter can be carried
The length of breath；The length of data information can be carried；The modulation system for carrying data information；It is described to carry data information
Diversity mode.
2. the method for user terminal random access as described in claim 1, which is characterized in that the system message sent from base station
In obtain the preset physical layer resources information.
3. the method for user terminal random access as described in claim 1, which is characterized in that the preset physical layer resources
Information is stored in advance in the user terminal.
4. the method for user terminal random access as described in claim 1, which is characterized in that described obtain is used for random access
Time/frequency source block information, including：
According to the instruction information for the physical layer resources for random access that base station is sent, believe from the preset physical layer resources
The information of multiple time/frequency source blocks corresponding with the instruction information is obtained in breath；
The time-frequency for random access is obtained from the information of multiple time/frequency source blocks corresponding with the instruction information to provide
The information of source block.
5. the method for user terminal random access as described in claim 1, which is characterized in that described obtain is used for random access
Physical layer resources information, including：
According to the data volume of current channel conditions and the data information for random access, provided from the preset physical layer
The information of the time/frequency source block for random access is obtained in source information.
6. a kind of user terminal, which is characterized in that including：
Acquiring unit is suitable for obtaining the information of the time/frequency source block for random access from preset physical layer resources information,
Wherein, the preset physical layer resources information includes：The identification information of time/frequency source block for random access and each
Data transmission parameters in the time/frequency source block, the time/frequency source block for random access are more than two and in time domains
Or it is not overlapped on frequency domain；
Access unit, suitable for utilizing the information of the time/frequency source block for random access got, by corresponding leading symbol
Sequence and data information for random access are sent to base station, by the base station according to the preset physical layer resources information
Random access detection is carried out, the data information for random access includes the identification information of the user terminal；
Wherein, the data transmission parameters in each time/frequency source block, including following at least one：Data letter can be carried
The length of breath；The length of data information can be carried；The modulation system for carrying data information；It is described to carry data information
Diversity mode.
7. user terminal as claimed in claim 6, which is characterized in that obtained from the system message that base station is sent described default
Physical layer resources information.
8. user terminal as claimed in claim 6, which is characterized in that the preset physical layer resources information is stored in advance in
The user terminal.
9. user terminal as claimed in claim 6, which is characterized in that the acquiring unit includes：
First obtains subelement, the instruction information for the physical layer resources for random access for being suitable for being sent according to base station, from institute
State the information that multiple time/frequency source blocks corresponding with the instruction information are obtained in preset physical layer resources information；
Second obtains subelement, suitable for obtaining the use from the information of multiple time/frequency source blocks corresponding with the instruction information
In the information of the time/frequency source block of random access.
10. user terminal as claimed in claim 6, which is characterized in that the acquiring unit is suitable for according to current channel conditions
And the data volume of the data information for random access, it is used for described in acquisition from the preset physical layer resources information
The information of the time/frequency source block of random access.
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| WO2018228522A1 (en) * | 2017-06-16 | 2018-12-20 | 华为技术有限公司 | Reference signal sending method, reference signal receiving method, and communication apparatus |
| CN109152082B (en) * | 2017-06-16 | 2021-10-26 | 华为技术有限公司 | Method for sending control information, base station and user equipment |
| CN109150387B (en) * | 2017-06-16 | 2023-04-28 | 华为技术有限公司 | Method for transmitting reference signal, method for receiving reference signal and communication device |
| CN109413756B (en) * | 2017-08-18 | 2020-11-03 | 维沃移动通信有限公司 | Random access method and device |
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| CN103179670A (en) * | 2013-04-03 | 2013-06-26 | 华为技术有限公司 | Method and device of transmission channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101119277A (en) * | 2006-08-03 | 2008-02-06 | 北京三星通信技术研究有限公司 | Device and method for transmitting control signalling |
| CN101483915A (en) * | 2008-01-07 | 2009-07-15 | 三星电子株式会社 | Device and method for transmitting random access preamble signal |
| WO2014038218A1 (en) * | 2012-09-10 | 2014-03-13 | Nec Corporation | Wireless communications system and method implemented in a wireless communications system |
| CN103179670A (en) * | 2013-04-03 | 2013-06-26 | 华为技术有限公司 | Method and device of transmission channel |
| CN104640212A (en) * | 2013-11-11 | 2015-05-20 | 中国移动通信集团公司 | Resource allocation method and device |
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