CN106060943B - A kind of accidental access method of multi-aerial radio communication system - Google Patents
A kind of accidental access method of multi-aerial radio communication system Download PDFInfo
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- CN106060943B CN106060943B CN201610537284.7A CN201610537284A CN106060943B CN 106060943 B CN106060943 B CN 106060943B CN 201610537284 A CN201610537284 A CN 201610537284A CN 106060943 B CN106060943 B CN 106060943B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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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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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of accidental access method of multi-aerial radio communication system, multi-antenna base station distributes one section of virtual carrier sub-slots to the random access terminal for having demand in each down channel time slot；In virtual carrier sub-slots, to each of next up channel time slot, distribution terminal forms transmission wave beam for base station, and sends virtual carrier signal using wave beam is sent；There is the random access terminal of demand to judge whether have an opportunity to be linked into next up channel time slot by listening to and detecting virtual carrier signal；This method, so that there is the random access terminal of demand to share up channel time slot, can improve power system capacity in the case where not interfering distributing user；Compared to traditional terminal random access method, so that each ascending time slot is all can serve as random access time slot using method proposed by the present invention, considerably increase random access time slot resource quantity, resource utilization is high, and the time delay of arbitrary terminal access is short；It can satisfy the extensive access demand of magnanimity wireless terminal in the following 5G.
Description
Technical field
The invention belongs to wireless communication technology fields, more particularly, to a kind of the random of multi-aerial radio communication system
Cut-in method.
Background technique
5th third-generation mobile communication (5G) has become the research and development focus in the whole world.As the main application scenarios of 5G, machine type is logical
Believe that (MTC) has huge development prospect.MTC can realize the company of hundreds of millions Intelligent Terminals in the case where being not necessarily to manpower intervention
It connects.This extensive intelligentized terminal connection method will create unprecedented application scenarios and economic model.It expects
The year two thousand thirty, global MTC terminal connection number will be close to 100,000,000,000, wherein China is more than 20,000,000,000.In the connection of such mass termination
In scene, the extensive communication requirement of MTC terminal how is met in the case where not interfering traditional mobile Internet terminal to communicate
It is the key challenge in 5G system.Therefore, the Random Access of design MTC terminal in a wireless communication system is most important,
Random Access is that the terminal of unassigned radio resource is distributed wirelessly using dedicated time slot and frequency spectrum resource request base station
Resource is communicated or is directly transmitted the process of data.
Random Access in the prior art is LTE communication system Random Access, including is based on non-competing and base
In the Random Access of competition；Under based on non-competing Random Access, specified access-in resource is distributed in base station
The access terminal of particular demands (time limit requires high), this access way endless conflict, but it is few to can access terminal quantity；?
Under Random Access competition-based, the limited time and frequency spectrum resource that terminal to be accessed is reserved by base station send access
Request, the radio resource that can be used for communicating with other terminal challenges；Because multiple terminals may the identical pilot tone sequence of simultaneous selection
Column request access, so there are potential access interferences for terminal room.
Since the radio resource that Random Access can be used for accessing in LTE system is limited, and MTC usually possesses magnanimity and connects
Enter demand and, in LTE system Random Access under following MTC scene easy initiation large-scale terminal high to delay requirement
Conflict can not provide timely reliable access service；On the other hand, since the data packet of MTC terminal transmission is usually shorter, terminal
By interacting the Random Access for obtaining radio resource again efficiency from the utilization of resources and Saving in time costs with base station
It is lower.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of multi-aerial radio communication systems
Accidental access method, its object is to realize magnanimity in the case where guaranteeing that traditional mobile Internet terminal access is unaffected
The access of terminal.
Purpose to realize the present invention provides a kind of multi-aerial radio communication system according to one aspect of the present invention
Accidental access method includes the following steps:
(1) base station marks off virtual carrier sub-slots in down channel time slot；
(2) base station is that distribution terminal forms transmission to each of next up channel time slot by virtual carrier sub-slots
Wave beam, and send wave beam using these and generate virtual carrier signal；
(3) random access terminal for having data to send demand listens to virtual carrier signal；When being listened in listening periods
The intensity of all virtual carrier signals be below thresholding, then the random access terminal is obtained sends out in next up channel time slot
Play the permission of access request or data transmission；Otherwise, into wait state；
Above-mentioned thresholding is determined according to system largest random access terminal number allowed；
(4) base station forms distribution terminal and receives wave beam, receives distribution terminal data, and in distribution terminal wave beam
The data of random access terminal are detected, received in the orthogonal subspaces of subspace.
The intensity of all virtual carrier signals listened in listening periods is below thresholding, shows there be the random of demand
The channel quadrature of all distribution terminals of the channel of access terminal and next up channel time slot, the random access terminal pair
Distribution terminal does not interfere with；
Processing is shaped by uplink beam and forms reception wave beam, and specifically, base station is when receiving terminal signaling, to each
Signal on receiving antenna receives weight multiplied by different plural numbers and is then added, the reception signal that multiple receiving antennas are received into
Row linear combination to enhance the signal from the terminal, while inhibiting the interference from other terminals；
It is formed by Inferior obliqued overaction processing and sends wave beam, specifically, base station will emit when sending signal to terminal
Signal is sent multiplied by different complex transmission weights, then from multiple transmitting antennas in advance；Receive weight and Transmit weight by
Base station is calculated according to the channel information of terminal.
The above method proposed by the present invention has apparent advantage compared to traditional accidental access method；Traditional connects at random
Enter method and divides the random access terminal competition that specific radio resource is provided with demand, since radio resource is limited, this concentration
The cut-in method of formula is unable to satisfy the demand of magnanimity terminal access, will lead to serious terminal conflict and propagation delay time；And this hair
This distributed method of bright offer, by distributing a bit of virtual carrier sub-slots, each descending time slot in descending time slot
It all can serve as random access time slot, be not necessarily to specific random access resource, considerably increase random access time slot resource quantity,
And resource utilization is high, the delay of arbitrary terminal access is short；The extensive access need of magnanimity wireless terminal in the following 5G can be met
It asks.
Preferably, the accidental access method of above-mentioned multi-aerial radio communication system, step (1) divide the virtual carrier period of the day from 11 p.m. to 1 a.m
The method of gap specifically:
In down channel time slot, a bit of time slot is chosen in advance as virtual carrier sub-slots；Virtual carrier sub-slots
It is made of L symbol, number of the L not less than the distribution terminal of next up channel time slot；
Wherein, distribution terminal refers to by base station distribution up channel time interval resource, and in the up channel of distribution
Gap sends the terminal of data to base station.
Preferably, the accidental access method of above-mentioned multi-aerial radio communication system, in step (2), to each having distributed
Terminal assigns a virtual carrier signal；Virtual carrier signal between terminal is mutually orthogonal；The virtual carrier signal of transmission includes
The virtual carrier signal of all distribution terminals；Virtual carrier signal is generated according to following methods:
(2.1) each distribution terminal is formed and sends wave beam bi；Wherein biIt is the row vector that dimension is antenna number；I refers to
I-th of distribution terminal, 1≤i≤Na；NaIndicate distribution terminal total number；
(2.2) virtual carrier using a line of orthogonal matrix S as each distribution terminal, wherein i-th of terminal pair
Answer the i-th row of S；
The transmission wave beam and orthogonal matrix S formed according to each distribution terminal generates virtual carrier signal:
Wherein, V is the matrix that line number is antenna number, columns is L；siRefer to the i-th row of orthogonal matrix S；()TIt indicates to turn
It sets；Hadamard matrix or Discrete Fourier transform can be used in orthogonal matrix S.
Preferably, the accidental access method of above-mentioned multi-aerial radio communication system generates virtual carrier according to following methods
Signal:
(2.1) each distribution terminal is formed and sends wave beam bi；
Wherein, biIt is the row vector that dimension is antenna number, i refers to i-th of distribution terminal, 1≤i≤Na；NaExpression has divided
With terminal total number；
(2.2) the virtual carrier signal using single time domain or frequency domain symbol as each distribution terminal；In order to protect
The virtual carrier signal for demonstrate,proving each terminal is mutually orthogonal, and the corresponding character position (time-frequency location) of each terminal is different.
The accidental access method of above-mentioned multi-aerial radio communication system, can flexible Application to multiple channel wireless communication system
In:
Random access terminal carries out above-mentioned random access processing to multiple channels in system, in the virtual load of each channel
Marble time slot is listened to；When all virtual carrier signal strengths that the terminal listens to multiple channels are below thresholding, then should
Random access terminal can randomly choose a channel access or selection from this multiple channel, and wherein virtual carrier signal is overall
The minimum channel access of intensity.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) accidental access method of multi-aerial radio communication system provided by the invention, it is empty by being distributed in descending time slot
Quasi- carrier wave sub-slots, using each descending time slot as random access time slot to be selected, there is no need to distribute specific random access money
Source considerably increases random access time slot resource quantity, improves resource utilization, and reduces access delay；
(2) accidental access method of multi-aerial radio communication system provided by the invention, due to there is the random access of demand
The channel quadrature of all distribution terminals of terminal institute's selected channel and next up channel time slot, therefore the random access is whole
End does not interfere with distribution terminal；
(3) accidental access method of multi-aerial radio communication system provided by the invention, random access terminal are not interfering
Under the premise of distribution terminal, up channel time slot can be shared, there is the beneficial effect for improving power system capacity.
Detailed description of the invention
Fig. 1 is the flow diagram of the accidental access method of multi-aerial radio communication system provided in an embodiment of the present invention；
Fig. 2 is the Slot format and virtual carrier sub-slots schematic diagram in the case of the time division duplex in the embodiment of the present invention；
Fig. 3 is the Slot format and virtual carrier sub-slots schematic diagram in the case of the frequency division duplex in the embodiment of the present invention；
Fig. 4 is multichannel Slot format and virtual carrier sub-slots schematic diagram in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
In embodiment, to multi-aerial radio communication system provided by the invention by taking the single channel under TDD mode as an example
Accidental access method be illustrated.In embodiment, system base-station configures more and sends and receives antenna；Base station is by channel time slot
Multiple uplink and downlink time slots are divided into, these time slots are defined as time interval resource；Base station is by each ascending time slot resource allocation
To several terminals；The terminal definitions of data are sent as distribution terminal to base station in the ascending time slot of distribution；In the present embodiment,
Terminal A, terminal B and terminal C are present channel distribution terminal；Terminal D and terminal E are currently to have data to send demand in system
Random access terminal.
For terminal A, B, C, their channel vector is expressed as hA、hBAnd hC；Grasp the letter of these three terminals in base station
Road information simultaneously carries out uplink and downlink beam forming processing to it；For terminal D and terminal E, base station does not grasp its channel information.
The accidental access method for the multi-aerial radio communication system that embodiment provides, detailed process is as shown in Figure 1, include
Following steps:
(1) base station divides virtual carrier sub-slots:
In current down channel time slot, base station is that terminal D and terminal E mark off one section of virtual carrier sub-slots；This
In embodiment, system time gap and virtual carrier sub-slots relationship are as shown in Figure 2；
Virtual carrier sub-slots position is preset by system, and virtual carrier sub-slots are made of L symbol, symbol lengths
Number of the L not less than distribution terminal；In embodiment, L is more than or equal to 3；
Why it is referred to as virtual carrier be because in the present invention, random access terminal not actually listen to terminal A, B,
The transmission situation of C, but the acquisition of information channel occupancy situation sent by base station；Terminal D and terminal E utilize virtual carrier
The reception signal of time slot judges whether oneself can initiate access request in next ascending time slot or carry out data transmission；
(2) base station sends virtual carrier signal:
In virtual carrier sub-slots, base station is that terminal A, B, C are respectively formed transmission wave beam；By taking high specific transmits as an example, eventually
The transmission wave beam of end A, B, C are expressed as bi=hi *I ∈ { A, B, C }, wherein ()*Indicate conjugation；And wave beam point is sent using these
Not Fa Song terminal A, terminal B and terminal C correspondence virtual carrier signal；The virtual carrier signal of each terminal is mutually orthogonal；Base station
The virtual carrier signal of transmission includes the virtual carrier signal of above-mentioned all 3 terminals；The virtual carrier signal of distribution terminal
Can there are many form generate, as long as ensuring that the virtual carrier signal of each terminal is mutually orthogonal；
A kind of method is to pass through L rank orthogonal matrix (Hadamard matrix or discrete Fourier transform square using distribution terminal
Battle array) row/column modulate generate；Virtual carrier signal in order to guarantee terminal is mutually orthogonal, the corresponding orthogonal matrix of each terminal
Row/column is different；By taking L=8 as an example, terminal A can choose in Hadamard matrix [1,1,1,1,1,1,1,1] this line；Terminal B is optional
[1,1,1,1, -1, -1, -1, -1] this line is taken in Hadamard matrix；Terminal C can choose in Hadamard matrix [1, -1,1, -1,
1, -1,1, -1] this line；
Another method is to occupy single symbol by distribution terminal to generate；Virtual carrier signal in order to guarantee terminal is mutual
Mutually orthogonal, the corresponding character position (time-frequency location) of each terminal is different；
(3) random access terminal listens to virtual carrier signal and accesses channel:
Terminal D and terminal E listen to virtual carrier signal in virtual carrier sub-slots；When terminal D and terminal E listen to terminal
A, the virtual carrier signal strength of B, C are below a pre-determined threshold, then terminal D and terminal E are obtained in next ascending time slot
The permission that access channel is initiated access request or carried out data transmission；Otherwise, into wait state；
(4) base station received signal:
Base station is respectively formed reception wave beam to terminal A, B, C first when carrying out ascending time slot data receiver, carries out data
It receives；By taking high specific reception technique as an example, the reception beam signal of terminal A, B, C can be indicated are as follows: ri=biR i∈{A,B,
C }, wherein R is base station received signal；
Since virtual carrier sensing in wireless network communication process ensure that the channel and the channel quadrature of distribution terminal of random access terminal, institute
The signal from random access terminal can significantly be inhibited to receive wave beam, avoid the interference of random access terminal；
Base station is in distribution terminal wave beam subspace W1=span (hA,hB,hC) orthogonal subspaces W1 ⊥Interior search connects at random
Enter terminal, after carrying out channel estimation to random access terminal, is formed and receive the data that wave beam receives random access terminal；It has distributed
Terminal subspace is formed by the corresponding channel vector of distribution terminals all on the time slot, wherein each vector dimension is equal to base station
Antenna number；The orthogonal subspaces of distribution terminal refers to that the son of any vector and distribution terminal Orthogonal Subspaces in space is empty
Between.
The accidental access method of this multi-aerial radio communication system provided by the invention can flexible Application in frequency division duplex
In system, the Slot format and virtual carrier sub-slots in frequency division duplex are as shown in Figure 3；End in frequency division duplex system
Hold random access step identical as the step in above-mentioned tdd systems.
The present invention provide multi-aerial radio communication system accidental access method can flexible Application in multi-channel communication system
In；Multichannel Slot format and virtual carrier sub-slots are as shown in Figure 4；For TDD mode, random access terminal
Above-mentioned random access processing: virtual carrier sub-slots of the random access terminal to each channel is carried out to N number of channel in system
It is listened to；When all virtual carrier signal strengths that the terminal listens to plurality of channel are below thresholding, then this is random
Access terminal can randomly choose one of channel from this multiple channel and be accessed or selected wherein virtual carrier signal
The minimum channel of bulk strength is accessed.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of accidental access method of multi-aerial radio communication system, which comprises the steps of:
(1) base station marks off virtual carrier sub-slots in down channel time slot；The method tool for dividing virtual carrier sub-slots
Body are as follows: in down channel time slot, one section of time slot of pre-selection is as virtual carrier sub-slots, and the virtual carrier sub-slots are by L
A symbol is constituted；Number of the L not less than the distribution terminal of next up channel time slot；
(2) base station is that distribution terminal forms send wave to each of next up channel time slot by virtual carrier sub-slots
Beam, and virtual carrier signal is generated using wave beam is sent, base station is that the virtual carrier signal that distribution terminal generates is mutually orthogonal；
(3) random access terminal for having data to send demand listens to virtual carrier signal；When the institute listened in listening periods
There is the intensity of virtual carrier signal to be below thresholding, then the random access terminal is obtained connects in the initiation of next up channel time slot
Enter request or transmit the permission of data, the thresholding is determined according to system largest random access terminal number allowed；
(4) base station forms distribution terminal and receives wave beam, receives distribution terminal data；And it is empty in of distribution terminal wave beam
Between orthogonal subspaces in detection, receive random access terminal data, distribution terminal subspace by current time slots own
The corresponding channel vector of distribution terminal is formed, wherein each vector dimension is equal to antenna for base station number；Distribution terminal is orthogonal
Subspace refers to the subspace of any vector and distribution terminal Orthogonal Subspaces in space.
2. accidental access method as described in claim 1, which is characterized in that generate the virtual carrier according to following methods and believe
Number:
(2.1) each distribution terminal is formed and sends wave beam bi；
Wherein, biIt is the row vector that dimension is antenna number, i refers to i-th of distribution terminal, 1≤i≤Na；NaExpression has distributed end
Hold total number；
(2.2) virtual carrier using a line of orthogonal matrix S as each distribution terminal, according to each distribution terminal
It sends wave beam and orthogonal matrix S generates virtual carrier signal:
Wherein, V is the matrix that line number is antenna number, columns is L；siRefer to the i-th row of orthogonal matrix S；()TIndicate transposition.
3. accidental access method as described in claim 1, which is characterized in that generate the virtual carrier according to following methods and believe
Number:
(2.1) each distribution terminal is formed and sends wave beam bi；
Wherein, biIt is the row vector that dimension is antenna number, i refers to i-th of distribution terminal, 1≤i≤Na, NaExpression has distributed end
Hold total number；
(2.2) the virtual carrier signal using single time domain or frequency domain symbol as each distribution terminal；Each terminal is corresponding
Character position is different, so that the virtual carrier signal of each terminal is mutually orthogonal.
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| CN108496402B (en) * | 2016-09-29 | 2021-05-07 | 华为技术有限公司 | Initial access method and device |
| CN109413756B (en) * | 2017-08-18 | 2020-11-03 | 维沃移动通信有限公司 | Method and device for random access |
| CN108668379B (en) * | 2018-08-06 | 2021-04-13 | 电子科技大学 | A method for preamble reservation in low-latency and high-reliability scenarios of 5G system |
| CN111918394B (en) * | 2019-05-09 | 2024-05-07 | 深圳长城开发科技股份有限公司 | Method for uplink data of LoRa terminal, loRa network and storage medium |
| CN110621072B (en) * | 2019-09-29 | 2023-05-16 | 京信网络系统股份有限公司 | Resource scheduling method, device, base station equipment and storage medium |
| CN118985157A (en) * | 2022-08-01 | 2024-11-19 | 中兴通讯股份有限公司 | Systems, methods, and non-transitory computer-readable media for virtual carrier-based wireless communications |
| CN118743291A (en) * | 2022-08-12 | 2024-10-01 | 北京小米移动软件有限公司 | Random access method and device, storage medium |
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