CN106937404A - A kind of method that Stochastic accessing time delay is reduced on unlicensed spectrum - Google Patents
A kind of method that Stochastic accessing time delay is reduced on unlicensed spectrum Download PDFInfo
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- CN106937404A CN106937404A CN201710164349.2A CN201710164349A CN106937404A CN 106937404 A CN106937404 A CN 106937404A CN 201710164349 A CN201710164349 A CN 201710164349A CN 106937404 A CN106937404 A CN 106937404A
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- carrier wave
- lbt
- stochastic accessing
- subframe
- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
Abstract
The invention discloses a kind of method that Stochastic accessing time delay is reduced on unlicensed spectrum, belong to mobile communication technology field.The method that the present invention uses " LBT orders are indicated ", base station uses multi-carrier scheduling to the Stochastic accessing of terminal, by introducing physics indication signal, eNB indicated UE that the order of LBT is performed to each unauthorized carrier wave for Stochastic accessing of configuration before UE carries out PRACH transmission based on this signaling so that UE can as early as possible access channel.Due to base station on free time carrier wave is specified transmitting physical indication signal, therefore serve the effect of channel reservation to a certain extent, so as to further increase the terminal successful chance of idle carrier sense first, reduce the time delay of random access procedure.
Description
Technical field
The invention belongs to mobile communication technology field, it is related to auxiliary to authorize (LAA) system of access, refers to one specifically
Plant the method that Stochastic accessing time delay is reduced on unlicensed spectrum.
Background technology
In Long Term Evolution (LTE) system, user equipment (UE) is only had to be set up by random access procedure and cell and is connected
And after obtaining uplink synchronous, can just carry out uplink.Two kinds of random access procedures defined in LTE standard, are respectively based on
The Stochastic accessing of competition and based on non-competing Stochastic accessing.In the random access procedure based on competition, UE will be from network
Randomly choose a preamble in targeting sequencing (preamble) resource pool of configuration to send, it is thus possible to multiple users occur
Using the situation of same preamble, so as to cause preamble to conflict.And in based on non-competing random access procedure,
Network can distribute a specific preamble to user, because other users will not be using this preamble so as to avoid
Preamble collision problems.Specifically, the process based on non-competing Stochastic accessing is：(1) subframe #n (n is subframe sequence number)
When, base station notifies that UE needs to initiate Stochastic accessing, and the Preamble Index that specified UE should be used by PDCCH order
With PRACH Mask Index；(2) UE is counted from subframe #n+k, sends what is specified in first available PRACH subframe
Preamble, wherein k >=6；(3) after UE have sent preamble, will be monitored in accidental access response (RAR) time window
PDCCH, obtains timing advance (TA) value.
Because traditional LTE is only operated on mandate frequency spectrum, under carrier aggregation (CA) scene, when all cell deployments are
During same timing advance group (TAG), UE only needs to set up Stochastic accessing with main plot (PCell).And newly introduce it is auxiliary
Help mandate access system (LAA systems) to allow unlicensed spectrum and authorize frequency spectrum to combine deployment in the way of CA, carrier wave will be authorized
It is configured to PCell, unauthorized carrier wave and is configured to secondary cell (SCell).Due to the working frequency of PCell be generally in 800MHz or
Person 2GHz, and the working frequency of LAA SCell may be up to 5.8GHz, the frequency distance of two cells is huge, so that it is difficult to
PCell and SCell is allowed to be in same TAG, it is therefore necessary to carry out random access procedure to LAA SCell.In order to solve this
Individual problem, third generation partner program (3GPP) reaches following agreement in RAN1#84 meeting：Supported in LAA SCell
Obey Listen Before Talk (LBT) based on non-competing Stochastic accessing.In other words, the Stochastic accessing of unauthorized carrier wave will be by base
The PDCCH order for sending that stand are triggered.
The scene that another kind needs to carry out Stochastic accessing on unauthorized carrier wave is dual link scene：UE needs to keep simultaneously
With macro base station (MeNB) and the parallel connection at prothetic group station (SeNB).In such a scenario, if the connection whole base of UE and SeNB
If unlicensed spectrum, UE is also necessary to carry out Stochastic accessing to SeNB on unauthorized carrier wave.
When carrying out Stochastic accessing to unlicensed spectrum in LAA systems, UE can send preamble on unauthorized carrier wave.
Due to the non-intellectual of unauthorized carrier channel situation, UE LBT may fail before preamble is transmitted, therefore waiting for transmission
Preamble will wait next available PRACH sub-frame transmissions or directly be dropped, so as to cause whole Stochastic accessing mistake
The delay of journey.
In order to reduce, random access procedure is unexpected to postpone, it is necessary to increase the access chance of PRACH transmission.But according to
Current random access procedure understands that UE terminates the chance that only once PRACH is transmitted before in Stochastic accessing (RA) response window,
In order to solve this problem, some companies propose the configuration multiple PRACH transmission opportunitys in " PRACH transmission times window ".Additionally,
Different in view of the channel conditions on different unauthorized carrier waves, also some companies propose that a PDCCH order dispatches UE pairs
Multiple unauthorized carrier wave in same TAG carries out Stochastic accessing (3GPP R1-162669, R1-162803).For second
Method, UE will be randomly choosed in first available PRACH subframe or a carrier wave being specified using base station is carried out
LBT.If LBT fails, UE will select another carrier wave to carry out LBT in next available PRACH subframes, with such
Push away, until detecting the carrier wave of free time and then sending preamble.
The content of the invention
Present invention mainly solves in LAA systems, the channel access probability of Stochastic accessing is low to cause whole random access procedure
Time delay problem higher.In the prior art, base station (eNB) dispatches UE in same TAG using a PDCCH order
Multiple carrier waves defer to the Stochastic accessing of LBT, and due to the uncertainty of unauthorized carrier availability, each carrier wave to dispatching enters
The order of row LBT can influence the time delay of whole random access procedure and the load of LBT.The present invention proposes one kind in unauthorized frequently
The method that Stochastic accessing time delay is reduced in spectrum, methods described using " LBT order indicate " method, it is a kind of extra by introducing
Signaling (referred to as physics indication signal), eNB was used for based on this signaling instruction UE before UE carries out PRACH transmission to configuration
Each unauthorized carrier wave of Stochastic accessing performs the order of LBT so that UE can as early as possible access channel, when reducing Stochastic accessing with this
Prolong.
The advantage of the invention is that：
(1) LBT is carried out to each carrier wave by base station side in advance, and the channel status of each carrier wave is indicated by physics
Signal tells that UE, UE will take the lead in carrying out LBT on the best carrier wave of channel condition, improves the successful probability of LBT, effectively reduces
Stochastic accessing time delay.
(2) transmitted because physics indication signal will be configured on the best carrier wave of channel status that eNB thinks, therefore
The effect of channel reservation is served to a certain extent, the UE successful probability of LBT first is improve, and is further reduced and is connect at random
Enter the time delay of process.
(3) UE to each carrier wave carries out LBT, it is to avoid random selection according to the instruction of eNB by the order of channel quality quality
Carrier wave frequently fail caused by LBT, reduces the number of times of LBT, so as to save electricity to a certain extent.
(4) to the order that each carrier wave performs LBT it is that eNB notifies that eNB also will be appreciated by UE in certain specific sub-frame due to UE
On will carry out LBT to which carrier wave, receive signal so as to be monitored on corresponding carrier wave, it is to avoid eNB is simultaneously in this N number of load
Monitoring signals on ripple, so as to reduce the decoding number of times of eNB to a certain extent.
Brief description of the drawings
Fig. 1 is the implementation procedure schematic diagram of eNB sides and UE sides in the random access procedure based on unlicensed spectrum.
Fig. 2 is the method flow of the reduction Stochastic accessing time delay at eNB ends in the random access procedure based on unlicensed spectrum
Figure.
Fig. 3 is the method flow of the reduction Stochastic accessing time delay at UE ends in the random access procedure based on unlicensed spectrum
Figure.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of side that Stochastic accessing time delay is reduced on unlicensed spectrum of the invention
Method is described in detail.
The present invention proposes one kind in LAA systems, and the method that Stochastic accessing time delay is reduced on unlicensed spectrum is described
Method in, first, base station is configured with multiple unauthorized carrier wave in same TAG by high-level signaling to be used to connect at random
Enter.In subframe #n, base station sends PDCCH order and notifies that UE carries out multicarrier Stochastic accessing in LAA SCell.In subframe #n
+ k-1, is used to carry the channel shape of N (N >=2) individual carrier wave invention introduces a kind of new signaling (referred to as physics indication signal)
State information, specifically, eNB carries out LBT to described N number of carrier wave, and then the result according to LBT draws the channel of this N number of carrier wave
Status information, and be ranked up；Physics indication signal is then sent on the best carrier wave of channel status, and is referred to by this physics
Show that signal notifies to carry out this N number of carrier wave the order of LBT after UE.Since subframe #n+k (k >=6), UE is indicated according to base station
The order of LBT carry out LBT to each carrier wave, and carry out PRACH transmission on the first idle carrier wave for monitoring.Due to
ENB has previously carried out channel estimating to each carrier wave dispatched, therefore the order indicated according to eNB, and UE can be as soon as possible
Channel is accessed so as to reduce the time delay of random access procedure.
With reference to Fig. 1, Fig. 2 and Fig. 3, the method that Stochastic accessing time delay is reduced on unlicensed spectrum that the present invention is provided, bag
Base station end and UE ends two parts are included, detailed process is as follows：
Base station end：
(1) base station configured by high-level signaling will dispatch under same TAG N number of carrier wave (such as CC1, CC2,
CC3)。
(2) subframe #n (n is subframe sequence number), eNB sends random access request (PDCCH order) to UE, wherein wrapping
The information such as Preamble Index, PRACH Mask Index are included, indicates respectively that UE available preamble and PRACH are transmitted
Running time-frequency resource.
(3) assume that first available subframe is #n+k, in subframe #n+k-1, eNB carries out LBT to each carrier wave dispatched,
Judge the channel idle situation of each carrier wave, and physics indication signal is sent on the idle and best carrier wave of channel status.Than
Such as, eNB has found that CC2 is idle and channel status is best, then physics indication signal is sent on carrier wave CC2 to UE, notifies UE to each
Carrier wave carries out order (such as CC2- of LBT>CC1->CC3 represents that CC2 carries out the highest priority of PRACH transmission).Note herein
ENB transmitting physical indication signals on the CC2 of highest priority can play a part of channel reservation, further improve UE
The successful probabilities of LBT on CC2.
(4) if base station such as subframe #n+m (m >=k) in PRACH transmission time windows receives preamble, eNB will
TA values are estimated, and RAR is sent in RAR time windows to UE.
If base station does not receive preamble at the appointed time, first after the RAR time windows is available
The previous subframe of PRACH subframes carries out LBT to each carrier wave, returns to step (3).
UE ends：
(A) UE knows the N number of PRACH candidate carriers in the same TAG for Stochastic accessing in high-level signaling, and just
Beginningization i=1.
(B) UE receives PDCCH order in subframe #n, obtains configured information (random access request), including Preamble
The information such as Index, PRACH Mask Index, the running time-frequency resource information that UE is transmitted according to these information acquisitions PRACH, then match somebody with somebody
Put the running time-frequency resource that will be sent.
(C) in subframe #n+k-1, the physics indication signal that UE receives base station is believed so as to obtain the priority of PRACH transmission
Breath, LBT is performed on the carrier wave with physics indication signal.According to the example that above-mentioned eNB ends propose, if eNB is in carrier wave CC2
To UE, UE will carry out LBT to upper transmission physics indication signal in the end symbol of subframe #n+k-1 to CC2；
(D) if LBT successes on current carrier (such as CC2), UE will send on the carrier wave CC2 during subframe #n+k
Preamble, otherwise UE carry out LBT in the end symbol of #n+k to i+1 carrier wave CC1, the like, if carried to n-th
LBT still fails during ripple CC3, then need the previous subframe of the next available PRACH subframes after RAR time windows to receive
The physics indication signal that base station sends, returns to step (C).
Claims (3)
1. it is a kind of on unlicensed spectrum reduce Stochastic accessing time delay method, it is characterised in that：First, base station is believed by high-rise
The N number of unauthorized carrier wave that order is configured with same TAG is used for Stochastic accessing；In subframe #n, base station sends PDCCH order
Notify that UE carries out multicarrier Stochastic accessing in LAA SCell；In subframe #n+k-1, eNB carries out LBT to described N number of carrier wave,
Then the result according to LBT draws the channel condition information of this N number of carrier wave, and is ranked up；It is then best in channel status
Physics indication signal is sent on carrier wave, and notifies to carry out the suitable of LBT to this N number of carrier wave after UE by this physics indication signal
Sequence；Since subframe #n+k, the order of the LBT that UE is indicated according to base station carries out LBT to each carrier wave, and in first for monitoring
PRACH transmission is carried out on individual idle carrier wave.
2. it is according to claim 1 it is a kind of on unlicensed spectrum reduce Stochastic accessing time delay method, it is characterised in that：
It is in the method for base station end reduction Stochastic accessing time delay：
(1) base station configures the N number of carrier wave under same TAG that will be dispatched by high-level signaling；
(2) in subframe #n, eNB sends random access request PDCCH order to UE, indicates the available running time-frequency resources of UE；
(3) assume that first available subframe is #n+k, in subframe #n+k-1, eNB carries out LBT to each carrier wave dispatched, and judges
Go out the channel idle situation of each carrier wave, and physics indication signal is sent on the idle and best carrier wave of channel status, notify UE
The order of LBT is carried out to each carrier wave；
(4) if base station receives preamble in PRACH transmission time windows, eNB will estimate TA values, and in RAR
Between RAR is sent in window to UE；
If base station does not receive preamble at the appointed time, first available PRACH after the RAR time windows
The previous subframe of frame carries out LBT to each carrier wave, returns to step (3).
3. it is according to claim 1 it is a kind of on unlicensed spectrum reduce Stochastic accessing time delay method, it is characterised in that：
It is in the method for UE end station reduction Stochastic accessing time delay：
(A) UE knows the N number of PRACH candidate carriers in the same TAG for Stochastic accessing in high-level signaling；
(B) UE receives PDCCH order in subframe #n, obtains configured information, UE according to these information acquisitions PRACH transmit when
Frequency resource information, then configures the running time-frequency resource that will be sent；
(C) in subframe #n+k-1, UE receives the physics indication signal of base station so as to obtain the precedence information that PRACH is transmitted,
LBT is performed on carrier wave with physics indication signal；
(D) if LBT successes on current carrier, UE will send preamble on the carrier wave during subframe #n+k, and otherwise UE is in #
The end symbol of n+k carries out LBT to i+1 carrier wave, the like, if still failed to LBT during n-th carrier wave, need
The previous subframe of next available PRACH subframes that will be after RAR time windows receives the physics indication signal that base station sends,
Return to step (C).
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| CN105992347A (en) * | 2015-01-29 | 2016-10-05 | 北京三星通信技术研究有限公司 | Uplink signal sending method, user equipment and base station |
| CN109156015A (en) * | 2018-07-20 | 2019-01-04 | 北京小米移动软件有限公司 | The processing method and processing device of random access |
| CN109462894A (en) * | 2017-09-06 | 2019-03-12 | 三星电子株式会社 | For controlling the device and method of uplink transmission timing in the internet of things environment |
| CN109803444A (en) * | 2017-11-17 | 2019-05-24 | 中国移动通信有限公司研究院 | A kind of transmission method and terminal of Physical Random Access Channel |
| CN109863812A (en) * | 2019-01-18 | 2019-06-07 | 北京小米移动软件有限公司 | Access feedback method, device, base station, terminal and storage medium |
| CN110291835A (en) * | 2019-05-17 | 2019-09-27 | 北京小米移动软件有限公司 | Random access configuration information obtaining method, system and equipment |
| CN110636614A (en) * | 2018-06-21 | 2019-12-31 | 维沃移动通信有限公司 | Random access method, terminal and network equipment |
| WO2020024753A1 (en) * | 2018-08-01 | 2020-02-06 | Oppo广东移动通信有限公司 | Random access method, terminal device, and network device |
| WO2020029703A1 (en) * | 2018-08-10 | 2020-02-13 | 展讯通信（上海）有限公司 | Method and device for monitoring and indicating unlicensed spectrum pdcch, storage medium, terminal, and base station |
| CN111181663A (en) * | 2018-11-09 | 2020-05-19 | 普天信息技术有限公司 | Fast initial access method and device on unlicensed spectrum |
| CN111263465A (en) * | 2019-02-01 | 2020-06-09 | 维沃移动通信有限公司 | Transmission method and equipment of random access message |
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| CN105992347A (en) * | 2015-01-29 | 2016-10-05 | 北京三星通信技术研究有限公司 | Uplink signal sending method, user equipment and base station |
| CN109462894A (en) * | 2017-09-06 | 2019-03-12 | 三星电子株式会社 | For controlling the device and method of uplink transmission timing in the internet of things environment |
| CN109462894B (en) * | 2017-09-06 | 2022-03-04 | 三星电子株式会社 | Apparatus and method for controlling uplink transmission timing in an internet of things environment |
| CN109803444B (en) * | 2017-11-17 | 2021-01-15 | 中国移动通信有限公司研究院 | Transmission method and terminal for physical random access channel |
| CN109803444A (en) * | 2017-11-17 | 2019-05-24 | 中国移动通信有限公司研究院 | A kind of transmission method and terminal of Physical Random Access Channel |
| CN110636614A (en) * | 2018-06-21 | 2019-12-31 | 维沃移动通信有限公司 | Random access method, terminal and network equipment |
| US11706808B2 (en) | 2018-06-21 | 2023-07-18 | Vivo Mobile Communication Co., Ltd. | Random access method, terminal, and network device |
| WO2020014967A1 (en) * | 2018-07-20 | 2020-01-23 | 北京小米移动软件有限公司 | Random access processing method and apparatus |
| CN109156015B (en) * | 2018-07-20 | 2023-12-22 | 北京小米移动软件有限公司 | Random access processing method and device |
| CN109156015A (en) * | 2018-07-20 | 2019-01-04 | 北京小米移动软件有限公司 | The processing method and processing device of random access |
| WO2020024753A1 (en) * | 2018-08-01 | 2020-02-06 | Oppo广东移动通信有限公司 | Random access method, terminal device, and network device |
| WO2020029703A1 (en) * | 2018-08-10 | 2020-02-13 | 展讯通信（上海）有限公司 | Method and device for monitoring and indicating unlicensed spectrum pdcch, storage medium, terminal, and base station |
| CN111181663A (en) * | 2018-11-09 | 2020-05-19 | 普天信息技术有限公司 | Fast initial access method and device on unlicensed spectrum |
| CN109863812B (en) * | 2019-01-18 | 2022-12-27 | 北京小米移动软件有限公司 | Access feedback method, device, base station, terminal and storage medium |
| CN109863812A (en) * | 2019-01-18 | 2019-06-07 | 北京小米移动软件有限公司 | Access feedback method, device, base station, terminal and storage medium |
| CN111263465B (en) * | 2019-02-01 | 2021-12-07 | 维沃移动通信有限公司 | Transmission method and equipment of random access message |
| CN111263465A (en) * | 2019-02-01 | 2020-06-09 | 维沃移动通信有限公司 | Transmission method and equipment of random access message |
| WO2020220332A1 (en) * | 2019-04-30 | 2020-11-05 | Nokia Shanghai Bell Co., Ltd. | Mechanism for providing multiple transmission opportunities |
| WO2020232577A1 (en) * | 2019-05-17 | 2020-11-26 | 北京小米移动软件有限公司 | Random access configuration information obtaining method, system and device |
| CN110291835B (en) * | 2019-05-17 | 2023-03-10 | 北京小米移动软件有限公司 | Method, system and equipment for acquiring random access configuration information |
| CN110291835A (en) * | 2019-05-17 | 2019-09-27 | 北京小米移动软件有限公司 | Random access configuration information obtaining method, system and equipment |
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