CN106788861B - Base station and multiple access method - Google Patents
Base station and multiple access method Download PDFInfo
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- CN106788861B CN106788861B CN201610533633.8A CN201610533633A CN106788861B CN 106788861 B CN106788861 B CN 106788861B CN 201610533633 A CN201610533633 A CN 201610533633A CN 106788861 B CN106788861 B CN 106788861B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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Abstract
Base station and multiple access method, the method includes：The quantity of time resource needed for determining user equipment and frequency resource；Based on the quantity of identified time resource and frequency resource, and the basic spread spectrum code word configured by the user equipment, construct the spread spectrum code book of the user equipment；Using the spread spectrum code book constructed, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum, obtain corresponding time-domain and frequency-domain sequence；Element in obtained time-domain and frequency-domain sequence is respectively mapped in corresponding temporal frequency resource.Above-mentioned scheme can be improved the flexibility of multiple access access, meet the different business transmission demand of user equipment.
Description
Technical field
The present invention relates to wireless communication technique more particularly to a kind of base station and multiple access methods.
Background technique
Multiple access technique distributes to user after signal dimension to be divided into different channels, usually according to time shaft,
The dimension of signal space is divided into orthogonal or non-orthogonal subscriber channel by frequency axis or code word axis.When the load to transmit signal
When the different demarcation of wave frequency rate accesses to establish multiple access, referred to as Frequency Division Multiple Access (Frequency Division Multiple
Address, FDMA)；When there are the different demarcations of time to establish multiple access access to transmit signal, referred to as time division multiple access way
(Time Division Multiple Address, TDMA)；It is connect when with the different demarcation for transmitting signal pattern to establish multiple access
It is fashionable, referred to as CDMA mode (Code Division Multiple Address, CDMA).
The access of mass users equipment and high data transmission rate are the major demands of the 5th Generation Mobile Communication System (5G), including
Traditional orthogonal multi-access mode of TDMA, FDMA, CDMA, OFDMA have been unable to meet the business demand of user equipment.Therefore, industry
Boundary has begun one's study non-orthogonal access mode.It is different according to non-orthogonal mode is introduced, non-orthogonal multiple can be connect
Enter technology to be probably divided into three classes：The first kind is that power domain is nonopiate, and multiple users are distinguished using its power difference；Second class
It is that code domain is nonopiate, multiple users are distinguished using different code words are distributed；Third class is that intertexture is nonopiate, and multiple users pass through
Different deinterleaving methods distinguish.
In the prior art, code domain non-orthogonal multiple scheme is that most schemes is discussed at present, such as Sparse Code multiple access (Sparse
Code Multiple Access, SCMA), the multiple access of pattern definition (Pattern Defined Multiple Access,
PDMA), multiple users share accesses (Multi-user Shared Access, MUSA), resource expansion multiple access (Resource
Spread Multiple Access, RSMA), nonopiate coding multiple access (Non-orthogonal coded Multiple
Access, NCMA) etc. a variety of code domain non-orthogonal schemes.But code domain non-orthogonal multiple cut-in method in the prior art, it can not
The business transmission demand for meeting different user devices has multiple access access difference.
Summary of the invention
Present invention solves the technical problem that being how to improve the flexibility of multiple access access, meet the different business of user equipment
Transmission demand.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of multiple access method, the method includes：It determines
The quantity of time resource needed for user equipment and frequency resource；Based on the quantity of identified time resource and frequency resource,
And the basic spread spectrum code word configured by the user equipment, construct the spread spectrum code book of the user equipment；Using being constructed
Spread spectrum code book, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum, obtain corresponding time-domain and frequency-domain sequence；By gained
To time-domain and frequency-domain sequence in element be respectively mapped in corresponding temporal frequency resource.
Optionally, the quantity of time resource and frequency resource needed for the determining user equipment, including：Based on the use
The message transmission rate of family equipment data to be transmitted and the information of propagation delay time demand, determine the time resource of the user equipment
With the quantity of frequency resource.
Optionally, the quantity based on time resource needed for the user equipment and frequency resource, and be described
The basic spread spectrum code word that user equipment is configured constructs corresponding spread spectrum code book, including：Wherein, WjTable
Show the corresponding spread spectrum code book of user equipment j, bjIndicate the basic spread spectrum code word of user equipment j, ujExpression and bjIn same domain
Column vector, vjExpression and bjColumn vector in not same area.
Optionally, described to use constructed spread spectrum code book, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum,
Corresponding time-domain and frequency-domain sequence is obtained, including：Wherein, SjIndicate the downlink data of user equipment j,
TjIndicate the downlink data S of user equipment jjTime-domain and frequency-domain sequence,Indicate Kronecker product operation.
The embodiment of the invention also provides a kind of base station, the base station includes：Resource determination unit is adapted to determine that user sets
The quantity of standby required time resource and frequency resource；Codebook construction unit is suitable for based on identified time resource and frequency
The quantity of resource, and the basic spread spectrum code word configured by the user equipment, construct the spread spectrum code book of the user equipment；
The data of the user equipment are carried out time-domain and frequency-domain spread spectrum suitable for using constructed spread spectrum code book by spectrum-spreading unit, are obtained pair
The time-domain and frequency-domain sequence answered；Resource mapping unit, suitable for the element in obtained time-domain and frequency-domain sequence to be respectively mapped to pair
In the temporal frequency resource answered.
Optionally, the resource determination unit, suitable for the message transmission rate based on the user equipment data to be transmitted
With the information of propagation delay time demand, the time resource of the user equipment and the quantity of frequency resource are determined.
Optionally, the codebook construction unit, suitable for the spread spectrum code book using user equipment described in following formula construction：Wherein, WjIndicate the corresponding spread spectrum code book of user equipment j, bjIndicate the basic spreading code of user equipment j
Word, ujExpression and bjColumn vector in same domain, vjExpression and bjColumn vector in not same area.
Optionally, the spectrum-spreading unit, suitable for the data of the user equipment are carried out time domain frequency using following formula
Domain spread spectrum：Wherein, SjIndicate the downlink data of user equipment j, TjIndicate the downlink of user equipment j
Data SjTime-domain and frequency-domain sequence,Indicate Kronecker product operation.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that：
Above-mentioned scheme, base station can based on needed for user equipment time and frequency resource and the user equipment
Basic spread spectrum code construction described in the corresponding spread spectrum code book of user equipment, rather than assume all user equipment occupied times
The spread spectrum code book of structuring user's equipment under the premise of frequency resource is identical can satisfy the need of the business transmission of different user devices
It asks, improves the flexibility of multiple access access.
Detailed description of the invention
Fig. 1 is a kind of flow chart of multiple access method of the embodiment of the present invention；
Fig. 2 is the flow chart of another multiple access method of the embodiment of the present invention；
Fig. 3 to Fig. 5 is the example schematic using the multiple access method of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of one of embodiment of the present invention base station.
Specific embodiment
To solve the problem above-mentioned, the embodiment of the present invention by base station can based on needed for user equipment time and frequency
The corresponding spread spectrum code book of user equipment, can satisfy not described in the basic spread spectrum code construction of resource and the user equipment
With the demand that the business of user equipment is transmitted, the flexibility of multiple access access is improved.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
Fig. 1 shows the schematic diagram of one of embodiment of the present invention multiple access method.Referring to Fig. 1, it is being embodied
In, the multiple access method in the embodiment of the present invention may include following step：
Step S101：The quantity of time resource needed for determining user equipment and frequency resource.
In specific implementation, the quantity of the quantity and frequency resource of time resource needed for the user equipment be transferred to
The downlink data of the user equipment is related.
Step S102：Match based on the quantity of identified time resource and frequency resource, and by the user equipment
The basic spread spectrum code word set, constructs the spread spectrum code book of the user equipment.
In specific implementation, the basic spread spectrum code word of the user equipment can be obtained by inquiring preset Basic codebook
It takes.Wherein, the Basic codebook is each user device configuration by base station according to the actual needs.
Step S103：Using the spread spectrum code book constructed, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum, are obtained
To corresponding time-domain and frequency-domain sequence.
In specific implementation, when construction obtains the corresponding spread spectrum code book of each user equipment, the spread spectrum can be used
Code book spreads the downlink data for being sent to the user equipment, to obtain and the one-to-one time domain of multiple user equipmenies
Frequency domain sequence.
Step S104：Element in obtained time-domain and frequency-domain sequence is respectively mapped to corresponding temporal frequency resource
On.
It in specific implementation, can be by the multiple use when obtaining the corresponding time-domain and frequency-domain sequence of multiple user equipmenies
Element in the time-domain and frequency-domain sequence of family equipment is respectively mapped in corresponding temporal frequency resource, and is sent to the multiple use
Family equipment, so as to realize multiple business demand multiple user equipmenies multiple access access demand.
Above-mentioned scheme, base station can based on needed for user equipment time and frequency resource and the user equipment
Basic spread spectrum code construction described in the corresponding spread spectrum code book of user equipment, rather than assume all user equipment occupied times
The spread spectrum code book of structuring user's equipment under the premise of frequency resource is identical can satisfy the need of the business transmission of different user devices
It asks, improves the flexibility of multiple access access.
The multiple access method in the embodiment of the present invention is further described in detail below in conjunction with Fig. 2.
Fig. 2 shows the flow charts of another multiple access method in the embodiment of the present invention.Fig. 2 is participated in, specific real
Shi Zhong, the multiple access method in the embodiment of the present invention may include following step：
Step S201：Message transmission rate and latency requirement based on user equipment, time needed for determining user equipment
The quantity of resource and frequency resource.
In specific implementation, the basic code for distinguishing different user devices can be arranged in base station according to the actual needs
This, i.e.,：
B=[b1b2...bN] (1)
Wherein, bjIt indicates the basic spread spectrum code word of user equipment j (1≤j≤N), and is the column vector of M, M indicates bjIt occupies
Time domain or frequency domain resource quantity, i.e., time domain spread spectrum for, indicate bjOccupy M time-domain resource；For frequency domain spread spectrum,
Indicate bjOccupy M frequency domain resource.
In order to meet the various businesses demand of different user devices, according to the message transmission rate of each user equipment and prolong
When demand information, can using following formula determine each user equipment needed for time resource quantity and frequency resource
Quantity：
Q=M*P1*P2 (2)
Wherein, the quantity of time resource and the quantity of frequency resource needed for Q indicates user equipment, P1Indicate frequency domain expansion
The factor, P2Indicate time domain spreading factor.
Step S202：Match based on the quantity of identified time resource and frequency resource, and by the user equipment
The basic spread spectrum code word set, constructs the spread spectrum code book of the user equipment.
In an embodiment of the present invention, the spread spectrum code book of following formula construction user equipment can be used：
Wherein, WjIndicate the spread spectrum code book of user equipment j, ujIndicate the basic spread spectrum code word b with user equipment jjSame
Column vector in domain, vjIndicate the basic spread spectrum code word b with user equipment jjIn the column vector of not same area.It should be pointed out that with
Column vector of the basic spread spectrum code word of user equipment j in same domain refers to, as the basic spread spectrum code word b of user equipment jjFor when
When domain spreads code word substantially, ujIndicate time domain column vector；As the basic spread spectrum code word b of user equipment jjFor the basic spreading code of frequency domain
When word, ujIndicate frequency domain column vector.
Step S203：Using the spread spectrum code book constructed, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum, are obtained
To corresponding time-domain and frequency-domain sequence.
It in specific implementation, can be using following formula to being transferred to use when obtaining the spread spectrum code book of user equipment
The downlink data of family equipment j carries out time-domain and frequency-domain spread spectrum：
Wherein, SjIndicate the downlink data of user equipment j, TjIndicate the downlink data S of user equipment jjTime-domain and frequency-domain sequence
Column,Indicate Kronecker product operation.
Step S204：Element in obtained time-domain and frequency-domain sequence is respectively mapped to corresponding temporal frequency resource
On.
In specific implementation, it when the corresponding time-domain and frequency-domain sequence of the downlink data for obtaining multiple user equipmenies, can incite somebody to action
Each element in obtained multiple time-domain and frequency-domain sequences is respectively mapped in corresponding temporal frequency resource, and is sent at most
A user equipment.
In order to enable the multiple access method in the embodiment of the present invention is clearer, below in conjunction with specific example to this
Multiple access method in inventive embodiments is introduced.
In Fig. 3 into Fig. 5, a squareIndicate a resource units, such as a resource element (Resource
Element, RE) or resource block (Resource Block, RB) etc., it is determined by base station according to the granularity of resource allocation.Wherein,The downlink data of region expression user equipment 1 occupied temporal frequency resource after spread processing,Region indicates
The downlink data of user equipment 2 occupied temporal frequency resource after spread processing,Region indicates user equipment 1
Downlink data occupied temporal frequency resource after spread processing passes through spread processing with the downlink data of user equipment 2
The overlapping region of occupied part-time frequency resource afterwards.
Referring to Fig. 3, as the basic spread spectrum code word b of user equipment 1 and user equipment 21And b2Size is 4, i.e. M=4 to
When amount, according to the message transmission rate and delay requirement for being transferred to user equipment 1, the time resource that user equipment 1 occupies is determined
It is 3, frequency resource 4, the time resource that user equipment 2 occupies is 1, frequency resource 4.
The basic spread spectrum code word b of user equipment 11The column vector for being 4 for size, and the time resource that user equipment 1 occupies
It is 3, frequency resource 4, therefore, it is necessary to carry out time domain spread spectrum to user equipment 1, without carrying out frequency domain spread spectrum.At this point it is possible to
According to the actual needs, for example, choosing the corresponding u of user equipment 11It is 1, v1For [1,1,1]T, then using formula (3)
To determine the corresponding spread spectrum code word of user equipment 1 for [b1 b1 b1]。
Similarly, the basic spread spectrum code word b of user equipment 22The column vector for being 4 for size, and the time that user equipment 2 occupies
Resource is 1, frequency resource 4, therefore, to user equipment 2 without carrying out time domain spread spectrum and frequency domain spread spectrum.At this point it is possible to according to
Actual needs, by the corresponding u of user equipment 12And v2It is disposed as 1, can determine that user equipment 2 is corresponding further according to formula (3)
Spread spectrum code word, as substantially spread spectrum code word b2。
Referring to fig. 4, when user equipment 1 and user equipment 2 basic spread spectrum code word b1And b2When size is 4, according to biography
It is defeated by the message transmission rate and delay requirement of user equipment 1, determines that the time resource that user equipment 1 occupies is 4, frequency resource
It is 1, the time resource that user equipment 2 occupies is 8, frequency resource 1.
Wherein, the basic spread spectrum code word b of user equipment 11The column vector for being 4 for size, and the time that user equipment 1 occupies
Resource is 4, frequency resource 1, therefore, it is necessary to be not necessarily to carry out time domain and frequency domain spread spectrum to user equipment 1, i.e., by user equipment 1
Corresponding u1And v1It is disposed as 1, the corresponding spread spectrum code word of user equipment 1 as spreads code word b substantially2。
Similarly, the basic spread spectrum code word b of user equipment 22The column vector for being 4 for size, and the time that user equipment 2 occupies
Resource is 8, frequency resource 1, therefore, it is necessary to carry out time domain spread spectrum to user equipment 2, without carrying out frequency domain spread spectrum.At this point,
It can be by the corresponding v of user equipment 12It is set as 1, corresponding u2It is set as the vector of 2*1, such as by u2It is set as [1,1]T, then root
It can determine that the corresponding spread spectrum code word of user equipment 2 is [b according to formula (3)2, b2]T。
Referring to Fig. 5, as the b of the basic spread spectrum code word of user equipment 1 and user equipment 21And b2When size is 4, according to biography
It is defeated by the message transmission rate and delay requirement of user equipment 1, determines the time resource that user equipment 1 and user equipment 2 occupy
It is 2, the frequency resource of occupancy is 8.
Wherein, the basic spread spectrum code word b of user equipment 1 and user equipment 21And b2Size be 4 column vector, and use
The time resource that family equipment 1 and user equipment 2 occupy is 2, and frequency resource is 8.Therefore, it is necessary to user equipment 1 and user
Equipment 2 carries out time domain spread spectrum and frequency domain spread spectrum respectively, i.e., by user equipment 1 and the corresponding u of user equipment 21And u2It is set as 2*1
Vector, by user equipment 1 and the corresponding v of user equipment 21And v2It is disposed as the vector of 2*1.At this point, being needed further according to system
It asks, u is set1、u2、v1And v2, such as by u1And v1It is disposed as [1,1]T, u2And v2It is set as [1, -1]T, then respectively according to formula
(3) the spread spectrum code book that can determine user equipment 1 isThe spread spectrum code book of user equipment 2 is
The above-mentioned multiple access method in the embodiment of the present invention is described in detail, below will be to above-mentioned method
Corresponding device is described further.
Fig. 6 shows the structure of one of embodiment of the present invention base station.Referring to Fig. 6, in specific implementation, the present invention is real
Applying the base station 600 in example may include resource determination unit 601, codebook construction unit 602, spectrum-spreading unit 603 and resource impact
Unit 604, wherein：
The resource determination unit 601, the quantity of time resource needed for being adapted to determine that user equipment and frequency resource.
The codebook construction unit 602 suitable for the quantity based on identified time resource and frequency resource, and is institute
The basic spread spectrum code word that user equipment is configured is stated, the spread spectrum code book of the user equipment is constructed.
The data of the user equipment are carried out time domain suitable for using constructed spread spectrum code book by the spectrum-spreading unit 603
Frequency domain spread spectrum obtains corresponding time-domain and frequency-domain sequence.
The resource mapping unit 604, suitable for the element in obtained time-domain and frequency-domain sequence to be respectively mapped to correspond to
Temporal frequency resource on.
In an embodiment of the present invention, the resource determination unit 601 is suitable for being based on the user equipment data to be transmitted
Message transmission rate and propagation delay time demand information, determine the time resource of the user equipment and the number of frequency resource
Amount.
In an embodiment of the present invention, the codebook construction unit 602, suitable for using user described in following formula construction
The spread spectrum code book of equipment：Wherein, WjIndicate the corresponding spread spectrum code book of user equipment j, bjIndicate that user sets
The basic spread spectrum code word of standby j, ujExpression and bjColumn vector in same domain, vjExpression and bjColumn vector in not same area.
In an embodiment of the present invention, the spectrum-spreading unit 603, suitable for using following formula by the user equipment
Data carry out time-domain and frequency-domain spread spectrum：Wherein, SjIndicate the downlink data of user equipment j, TjIt indicates to use
The downlink data S of family equipment jjTime-domain and frequency-domain sequence,Indicate Kronecker product operation.
Using above-mentioned scheme, base station can based on needed for user equipment time and frequency resource and the user
The corresponding spread spectrum code book of user equipment described in the basic spread spectrum code construction of equipment, rather than assume that all user equipmenies are occupied
The spread spectrum code book of structuring user's equipment under the premise of temporal frequency resource is identical, thus can satisfy the business of different user devices
The demand of transmission improves the flexibility of multiple access access.
Those of ordinary skill in the art will appreciate that all or part of the steps 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.Anyone 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 (6)
1. a kind of multiple access method, which is characterized in that including：
The quantity of time resource needed for determining user equipment and frequency resource；
Based on the quantity of identified time resource and frequency resource, and the basic spreading code configured by the user equipment
Word constructs the spread spectrum code book of the user equipment；
Using the spread spectrum code book constructed, the data of the user equipment are subjected to time-domain and frequency-domain spread spectrum, obtain corresponding time domain
Frequency domain sequence；
Element in obtained time-domain and frequency-domain sequence is respectively mapped in corresponding temporal frequency resource；
The quantity based on time resource needed for the user equipment and frequency resource, and matched by the user equipment
The basic spread spectrum code word set constructs corresponding spread spectrum code book, including：
Wherein, WjIndicate the corresponding spread spectrum code book of user equipment j, bjIndicate the basic expansion of user equipment j
Frequency code word, ujExpression and bjColumn vector in same domain, vjExpression and bjColumn vector in not same area,It indicates in Crow
Gram product operation.
2. multiple access method according to claim 1, which is characterized in that the money of time needed for the determining user equipment
The quantity in source and frequency resource, including：
The information of message transmission rate and propagation delay time demand based on the user equipment data to be transmitted, determines the user
The time resource of equipment and the quantity of frequency resource.
3. multiple access method according to claim 1, which is characterized in that it is described to use constructed spread spectrum code book, it will
The data of the user equipment carry out time-domain and frequency-domain spread spectrum, obtain corresponding time-domain and frequency-domain sequence, including：
Wherein, SjIndicate the downlink data of user equipment j, TjIndicate the downlink data of user equipment j
SjTime-domain and frequency-domain sequence.
4. a kind of base station, which is characterized in that including：
Resource determination unit, the quantity of time resource needed for being adapted to determine that user equipment and frequency resource；
Codebook construction unit suitable for the quantity based on identified time resource and frequency resource, and is the user equipment
The basic spread spectrum code word configured, constructs the spread spectrum code book of the user equipment；
The data of the user equipment are carried out time-domain and frequency-domain spread spectrum, obtained by spectrum-spreading unit suitable for using constructed spread spectrum code book
To corresponding time-domain and frequency-domain sequence；
Resource mapping unit is provided suitable for the element in obtained time-domain and frequency-domain sequence is respectively mapped to corresponding temporal frequency
On source；
The codebook construction unit, suitable for the spread spectrum code book using user equipment described in following formula construction：
Wherein, WjIndicate the corresponding spread spectrum code book of user equipment j, bjIndicate the basic expansion of user equipment j
Frequency code word, ujExpression and bjColumn vector in same domain, vjExpression and bjColumn vector in not same area,It indicates in Crow
Gram product operation.
5. base station according to claim 4, which is characterized in that the resource determination unit, suitable for being set based on the user
The standby message transmission rate of data to be transmitted and the information of propagation delay time demand, determine the time resource and frequency of the user equipment
The quantity of rate resource.
6. base station according to claim 4, which is characterized in that the spectrum-spreading unit, suitable for using following formula by institute
The data for stating user equipment carry out time-domain and frequency-domain spread spectrum：
Wherein, SjIndicate the downlink data of user equipment j, TjIndicate the downlink data of user equipment j
SjTime-domain and frequency-domain sequence.
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| CN109981511B (en) * | 2017-12-27 | 2021-09-03 | 华为技术有限公司 | Data transmission based on non-orthogonal multiple access |
| WO2019144405A1 (en) * | 2018-01-29 | 2019-08-01 | Zte Corporation | Method and apparatus for generating spreading sequence codebooks |
| US10797748B2 (en) * | 2018-02-21 | 2020-10-06 | Qualcomm Incorporated | Pairwise cross correlation sequences for non-orthogonal multiple access wireless communications |
| EP3777384A4 (en) * | 2018-04-06 | 2021-12-01 | Nokia Technologies Oy | Methods and apparatuses for non-orthogonal multiple access resource utilization scalability |
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| CN104137573A (en) * | 2011-12-23 | 2014-11-05 | 黑莓有限公司 | A method implemented in a user equipment ue for use in a wireless system |
| CN104160772A (en) * | 2011-12-23 | 2014-11-19 | 黑莓有限公司 | A method implemented in an eNodeB base station |
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| CN105472752A (en) * | 2016-01-21 | 2016-04-06 | 清华大学 | Uplink random access method |
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| GB2411555A (en) * | 2004-02-27 | 2005-08-31 | Toshiba Res Europ Ltd | CDMA system with 2D spreading where the spreading codes/factors depend upon the number of active users |
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| CN104137573A (en) * | 2011-12-23 | 2014-11-05 | 黑莓有限公司 | A method implemented in a user equipment ue for use in a wireless system |
| CN104160772A (en) * | 2011-12-23 | 2014-11-19 | 黑莓有限公司 | A method implemented in an eNodeB base station |
| CN104869094A (en) * | 2015-04-29 | 2015-08-26 | 清华大学 | Upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access |
| CN105472752A (en) * | 2016-01-21 | 2016-04-06 | 清华大学 | Uplink random access method |
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