CN104469914A - Channel detection method and system, base station and terminal - Google Patents

Channel detection method and system, base station and terminal Download PDF

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Publication number
CN104469914A
CN104469914A CN201410757846.XA CN201410757846A CN104469914A CN 104469914 A CN104469914 A CN 104469914A CN 201410757846 A CN201410757846 A CN 201410757846A CN 104469914 A CN104469914 A CN 104469914A
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channel
round
period
lte system
terminal
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CN104469914B (en
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李明菊
朱亚军
雷艺学
张云飞
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a channel detection method and system, a base station and a terminal used when an LTE system works at an unauthorized frequency band. The channel detection method includes the following steps that a channel monitoring subframe taking a first period as a channel state monitoring period is arranged in a frame structure of the LTE system; whether the number of times of the situation that channel states continuously detected by the channel monitoring subframe are busy states reaches a preset number of times is judged; when it is determined that the number of times of the situation that the channel states continuously detected by the channel monitoring subframe are the busy states reaches the preset number of times, the detection period of the channel monitoring subframe is adjusted into a second period longer than the first period. According to the technical scheme, under the premise that normal work of the LTE system at the unauthorized frequency band is guaranteed, the LTE system can be prevented from generating larger interference in other systems when working at the unauthorized frequency band, and meanwhile the power consumption of the terminal and/or the base station is reduced when channel detection is executed.

Description

Channel detection method and system, base station and terminal
Technical field
The present invention relates to communication technical field, in particular to the channel detection method of a kind of LTE system when unauthorized band operation, a kind of LTE system at unauthorized band operation time Channel Detection system, a kind of base station and a kind of terminal.
Background technology
Along with the sharply increase of message volume, the mandate frequency spectrum of 3GPP is more and more not enough to provide higher network capacity.In order to improve the utilance of frequency spectrum resource further, 3GPP is just discussing how under the help of authorizing frequency spectrum, to use unlicensed spectrum, as 2.4GHz and 5GHz frequency range.The systems such as these unlicensed spectrums current mainly Wi-Fi, bluetooth, radar, medical treatment are in use.
Under normal circumstances, the access technology designed for authorizing frequency range, as LTE (Long TermEvolution, Long Term Evolution) is not suitable for using in unauthorized frequency range, because the requirement that this kind of access technology of LTE is optimized spectrum efficiency and Consumer's Experience is very high.But carrier aggregation (CarrierAggregation, CA) function allows and LTE is deployed in unauthorized frequency range becomes possibility.3GPP proposes the concept of LAA (the auxiliary access of LTE Assisted Access, LTE), authorizes the help of frequency spectrum to use unlicensed spectrum by LTE.And unlicensed spectrum can have two kinds of working methods, one is supplementary descending (SDL, Supplemental Downlink), namely only has downlink transfer subframe; Another kind is tdd mode, has both comprised descending sub frame, has also comprised sub-frame of uplink.Supplementing descending this situation can only be use by carrier aggregation technology.And tdd mode is except can using by carrier aggregation technology, can also uses by DC (Dual Connectivity, doubly-linked leads to), also can independently use.
Compared to Wi-Fi system, the LTE system being operated in unauthorized frequency range has the ability to provide higher spectrum efficiency and larger coverage effect, allows data traffic authorize seamless switching between frequency range and unauthorized frequency range based on same core net simultaneously.Concerning user, this means better broadband experience, higher speed, better stability and mobile facility.
The existing access technology used in unlicensed spectrum, as Wi-Fi, has more weak antijamming capability.In order to avoid interference, rule is avoided in a lot of interference of Wi-Fi system, as CSMA/CD (Carrier Sense Multiple Access/Collision Detection, csma/collision detection method), the general principle of this method is the AP (AccessPoint of Wi-Fi, access point) or terminal transmission signaling or data before, want whether have other AP or other-end around first Monitor detection in sending/receiving signaling or data, if have, then continue to monitor, do not have until listen to; If no, then generate a random number as back off time, in this back off time, if signaling or transfer of data do not detected, so after back off time terminates, AP or terminal can start to send signaling or data.This process as shown in Figure 1.
But, owing to there being good orthogonality to ensure that interference level in LTE network, so the downstream transmission of base station and user need not consider whether have other base stations or other users transmitting data around.If whether have other equipment around also not considering when LTE uses in unauthorized frequency range in the unauthorized frequency range of use, so great interference will be brought to Wi-Fi equipment.As long as because LTE has business just to transmit, without any monitoring rule, so Wi-Fi equipment just can not be transmitted when LTE has business to transmit, can only wait until that LTE business is transmitted, just can detect that channel clear is to carry out transfer of data.
Visible, LTE network is when using unauthorized frequency range, and one of topmost key point guarantees that LAA can coexist with existing access technology (such as Wi-Fi) on fair friendly basis.In order to better coexist with Wi-Fi, LTE needs a kind of LBT (Listen Before Talk, listem-before-talk) mechanism, and the LBT mechanism similar with Wi-Fi mainly can continue when channel busy being detected to detect, until channel idle detected, such LBT mechanism makes the main body (base station or terminal) performing LBT consume too many energy, is unfavorable for energy-conservation.
Therefore, under how can guaranteeing the prerequisite normally worked in unauthorized frequency range in LTE system, avoid LTE system to produce larger interference when unauthorized band operation to other system, the equipment power dissipation reduced in LTE system becomes technical problem urgently to be resolved hurrily simultaneously.
Summary of the invention
The present invention just based on above-mentioned technical problem one of at least, propose the Channel Detection scheme of a kind of new LTE system when unauthorized band operation, under the prerequisite normally worked in unauthorized frequency range in LTE system can be guaranteed, avoid LTE system to produce larger interference when unauthorized band operation to other system, reduce power consumption when terminal and/or base station execution Channel Detection simultaneously.
In view of this, according to a first aspect of the invention, propose the channel detection method of a kind of LTE system when unauthorized band operation, comprising: arranging in the frame structure of described LTE system with period 1 is the channel-monitoring subframe of channel status sense cycle; Judging that described channel-monitoring subframe is consecutively detected described channel status is whether the number of times of busy state reaches pre-determined number; Judge described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
In this technical scheme, by arranging channel-monitoring subframe, channel status is detected, when making LTE system be operated in unauthorized frequency range, corresponding interference avoidance mechanism can be taked, namely can detect channel status, and transmit data when channel idle being detected, data are not transmitted when channel busy being detected, and then LTE system can be coexisted peacefully with the other system (as Wi-Fi system) being operated in unauthorized frequency range when unauthorized band operation, to guarantee under the prerequisite that LTE system normally can work in unauthorized frequency range, avoid LTE system when unauthorized band operation owing to there is no interference avoidance mechanism and larger interference is produced to the other system with interference avoidance mechanism.
By judge channel-monitoring subframe with the period 1 be consecutively detected channel status reach pre-determined number as the number of times of busy state time, the sense cycle of channel-monitoring subframe is adjusted to the second round being greater than the period 1, make when channel is taken for a long time by other system, the main body (base station and/or terminal) performing Channel Detection can detect channel with the longer cycle, when avoiding channel to be in busy state, Channel Detection main body continues carry out detecting with the less cycle and increase the power consumption of Channel Detection main body.
In technique scheme, preferably, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprise: when described channel-monitoring subframe detects described channel status for idle condition with described second round, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, by when channel-monitoring subframe is channel status to be detected second round for idle condition, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, make when channel is not taken for a long time, can, in time by the cycle that the period modulation of channel-monitoring subframe is less, avoid continuing to detect and the efficiency of influential system channel with the longer cycle.
In technique scheme, preferably, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprise: when defining new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, when there being new data to be transmitted, not only make data waiting for transmission more, and new data to be transmitted may be more responsive to time delay, therefore by when defining new data to be transmitted, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, makes it possible to detect channel with the less cycle, and then guarantee the data to be transmitted that process is new in time.
In technique scheme, preferably, arrange described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.Preferably, if the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
Specifically, when the data volume of data to be transmitted is larger, in order to ensure the efficiency of system, need to detect channel with the less cycle, therefore pre-determined number can be set to higher value; And when the type of data to be transmitted is more responsive to time delay, in order to channel can be used as early as possible to send data to be transmitted, also needs to detect channel with the less cycle, therefore pre-determined number can be set to higher value.
In technique scheme, preferably, described second round is the integral multiple of described period 1.
In technique scheme, preferably, if the executive agent of described channel detection method is base station, then described channel detection method also comprises: described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
In this technical scheme, base station is when detecting channel (up channel and/or down channel) on the one hand, can by realizing energy-conservation to the adjustment of channel detection period, on the other hand base station also can by corresponding parameter notifications to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.Namely base station and terminal can simultaneously by realizing energy-conservation object to the adjustment of channel detection period.
In technique scheme, preferably, if the executive agent of described channel detection method is base station, then described channel detection method also comprises: described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
In this technical scheme, because base station is when channel idle being detected, terminal needs to detect PDCCH (Physical Downlink Control Channel, physical layer descending control channel), and when base station detects channel busy, terminal can be slept, to save power consumption, therefore when in base station execution Channel Detection, terminal does not need to perform Channel Detection, the parameter adjusted channel detection period can be sent to terminal by base station, by terminal to from employing discontinuous reception (i.e. Discontinuous reception, DRX) wake-up time during pattern and the length of one's sleep adjust.Particularly, when base station detects channel busy, terminal enters sleep state, and determines according to the cycle of base station detection channel the time that terminal is waken up, determine base station again to the result of Channel Detection to wake up after sleep, and then determine to enter the dormant time next time.When the cycle that channel is detected in base station changes, the time that terminal is waken up after entering sleep state also suitably adjusts.
In technique scheme, preferably, if the executive agent of described channel detection method is terminal, then, before the step of described channel-monitoring subframe is set in described frame structure, also comprise: receive the described period 1 of base station transmission, described pre-determined number and described second round.
In this technical scheme, terminal is when performing Channel Detection, and base station can by the parameter notifications that adjusts channel detection period to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.
In technique scheme, preferably, the described second round arranged when base station performs described channel detection method is less than or equal to the described second round arranged when terminal performs described channel detection method.In this technical scheme, because the traffic carrying capacity of base station is more compared to terminal, therefore in order to ensure the data transmission efficiency of base station, the long period (i.e. second round) that can arrange base station execution Channel Detection is less than or equal to the long period that terminal performs Channel Detection.
According to a second aspect of the invention, also proposed the Channel Detection system of a kind of LTE system when unauthorized band operation, comprising: the first setting unit, is the channel-monitoring subframe of channel status sense cycle for arranging in the frame structure of described LTE system with period 1; Judging unit is whether the number of times of busy state reaches pre-determined number for judging that described channel-monitoring subframe is consecutively detected described channel status; Processing unit, for judge at described judging unit described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
In this technical scheme, by arranging channel-monitoring subframe, channel status is detected, when making LTE system be operated in unauthorized frequency range, corresponding interference avoidance mechanism can be taked, namely can detect channel status, and transmit data when channel idle being detected, data are not transmitted when channel busy being detected, and then LTE system can be coexisted peacefully with the other system (as Wi-Fi system) being operated in unauthorized frequency range when unauthorized band operation, to guarantee under the prerequisite that LTE system normally can work in unauthorized frequency range, avoid LTE system when unauthorized band operation owing to there is no interference avoidance mechanism and larger interference is produced to the other system with interference avoidance mechanism.
By judge channel-monitoring subframe with the period 1 be consecutively detected channel status reach pre-determined number as the number of times of busy state time, the sense cycle of channel-monitoring subframe is adjusted to the second round being greater than the period 1, make when channel is taken for a long time by other system, the main body (base station and/or terminal) performing Channel Detection can detect channel with the longer cycle, when avoiding channel to be in busy state, Channel Detection main body continues carry out detecting with the less cycle and increase the power consumption of Channel Detection main body.
In technique scheme, preferably, described processing unit also for: after the sense cycle of described channel-monitoring subframe is adjusted to described second round, if the sense cycle of described channel-monitoring subframe to detect that described channel status is for idle condition described second round, is then adjusted to the described period 1 by described second round by described channel-monitoring subframe.
In this technical scheme, by when channel-monitoring subframe is channel status to be detected second round for idle condition, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, make when channel is not taken for a long time, can, in time by the cycle that the period modulation of channel-monitoring subframe is less, avoid continuing to detect and the efficiency of influential system channel with the longer cycle.
In technique scheme, preferably, also comprise: determining unit, after the sense cycle of described channel-monitoring subframe being adjusted to described second round at described processing unit, determine whether new data to be transmitted; Described processing unit also for, when described determining unit defines new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, when there being new data to be transmitted, not only make data waiting for transmission more, and new data to be transmitted may be more responsive to time delay, therefore by when defining new data to be transmitted, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, makes it possible to detect channel with the less cycle, and then guarantee the data to be transmitted that process is new in time.
In technique scheme, preferably, also comprise: the second setting unit, for arranging described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.Preferably, described second setting unit specifically for: if the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
Specifically, when the data volume of data to be transmitted is larger, in order to ensure the efficiency of system, need to detect channel with the less cycle, therefore pre-determined number can be set to higher value; And when the type of data to be transmitted is more responsive to time delay, in order to channel can be used as early as possible to send data to be transmitted, also needs to detect channel with the less cycle, therefore pre-determined number can be set to higher value.
In technique scheme, preferably, described second round is the integral multiple of described period 1.
According to a third aspect of the invention we, also proposed a kind of base station, comprising: the Channel Detection system of the LTE system as described in above-mentioned any one technical scheme when unauthorized band operation.
In technique scheme, preferably, described base station also comprises: the first notification unit, for described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
In this technical scheme, base station is when detecting channel (up channel and/or down channel) on the one hand, can by realizing energy-conservation to the adjustment of channel detection period, on the other hand base station also can by corresponding parameter notifications to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.Namely base station and terminal can simultaneously by realizing energy-conservation object to the adjustment of channel detection period.
In technique scheme, preferably, described base station also comprises: the second notification unit, for described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
In this technical scheme, because base station is when channel idle being detected, terminal needs to detect PDCCH (Physical Downlink Control Channel, physical layer descending control channel), and when base station detects channel busy, terminal can be slept, to save power consumption, therefore when in base station execution Channel Detection, terminal does not need to perform Channel Detection, the parameter adjusted channel detection period can be sent to terminal by base station, by terminal to from adopt discontinuous receiving mode time wake-up time and adjust the length of one's sleep.Particularly, when base station detects channel busy, terminal enters sleep state, and determines according to the cycle of base station detection channel the time that terminal is waken up, determine base station again to the result of Channel Detection to wake up after sleep, and then determine to enter the dormant time next time.When the cycle that channel is detected in base station changes, the time that terminal is waken up after entering sleep state also suitably adjusts.
According to a forth aspect of the invention, also proposed a kind of terminal, comprising: the Channel Detection system of the LTE system as described in above-mentioned any one technical scheme when unauthorized band operation.
In technique scheme, preferably, described terminal also comprises: receiving element, for receiving the described period 1 of base station transmission, described pre-determined number and described second round.
In this technical scheme, terminal is when performing Channel Detection, and base station can by the parameter notifications that adjusts channel detection period to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.
By above technical scheme, under the prerequisite normally worked in unauthorized frequency range in LTE system can be guaranteed, avoid LTE system to produce larger interference when unauthorized band operation to other system, reduce power consumption when terminal and/or base station execution Channel Detection simultaneously.
Accompanying drawing explanation
Regular schematic diagram is avoided in the interference that Fig. 1 shows Wi-Fi system;
Fig. 2 shows the schematic flow diagram of the channel detection method of LTE system when unauthorized band operation according to an embodiment of the invention;
Fig. 3 shows the schematic block diagram of the Channel Detection system of LTE system when unauthorized band operation according to an embodiment of the invention;
Fig. 4 shows the schematic block diagram of base station according to an embodiment of the invention;
Fig. 5 shows the schematic block diagram of terminal according to an embodiment of the invention;
Fig. 6 shows LBT according to an embodiment of the invention and periodically carries out the frame structure schematic diagram of Channel Detection;
Fig. 7 shows according to an embodiment of the invention to the schematic diagram that the sense cycle of LBT adjusts.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 2 shows the schematic flow diagram of the channel detection method of LTE system when unauthorized band operation according to an embodiment of the invention.
As shown in Figure 2, the channel detection method of LTE system when unauthorized band operation, comprising: step 202 according to an embodiment of the invention, and arranging in the frame structure of described LTE system with period 1 is the channel-monitoring subframe of channel status sense cycle; Step 204, judging that described channel-monitoring subframe is consecutively detected described channel status is whether the number of times of busy state reaches pre-determined number; Step 206, judge described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
In this technical scheme, by arranging channel-monitoring subframe, channel status is detected, when making LTE system be operated in unauthorized frequency range, corresponding interference avoidance mechanism can be taked, namely can detect channel status, and transmit data when channel idle being detected, data are not transmitted when channel busy being detected, and then LTE system can be coexisted peacefully with the other system (as Wi-Fi system) being operated in unauthorized frequency range when unauthorized band operation, to guarantee under the prerequisite that LTE system normally can work in unauthorized frequency range, avoid LTE system when unauthorized band operation owing to there is no interference avoidance mechanism and larger interference is produced to the other system with interference avoidance mechanism.
By judge channel-monitoring subframe with the period 1 be consecutively detected channel status reach pre-determined number as the number of times of busy state time, the sense cycle of channel-monitoring subframe is adjusted to the second round being greater than the period 1, make when channel is taken for a long time by other system, the main body (base station and/or terminal) performing Channel Detection can detect channel with the longer cycle, when avoiding channel to be in busy state, Channel Detection main body continues carry out detecting with the less cycle and increase the power consumption of Channel Detection main body.
In technique scheme, preferably, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprise: when described channel-monitoring subframe detects described channel status for idle condition with described second round, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, by when channel-monitoring subframe is channel status to be detected second round for idle condition, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, make when channel is not taken for a long time, can, in time by the cycle that the period modulation of channel-monitoring subframe is less, avoid continuing to detect and the efficiency of influential system channel with the longer cycle.
In technique scheme, preferably, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprise: when defining new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, when there being new data to be transmitted, not only make data waiting for transmission more, and new data to be transmitted may be more responsive to time delay, therefore by when defining new data to be transmitted, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, makes it possible to detect channel with the less cycle, and then guarantee the data to be transmitted that process is new in time.
In technique scheme, preferably, arrange described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.Preferably, if the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
Specifically, when the data volume of data to be transmitted is larger, in order to ensure the efficiency of system, need to detect channel with the less cycle, therefore pre-determined number can be set to higher value; And when the type of data to be transmitted is more responsive to time delay, in order to channel can be used as early as possible to send data to be transmitted, also needs to detect channel with the less cycle, therefore pre-determined number can be set to higher value.
In technique scheme, preferably, described second round is the integral multiple of described period 1.
In technique scheme, preferably, if the executive agent of described channel detection method is base station, then described channel detection method also comprises: described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
In this technical scheme, base station is when detecting channel (up channel and/or down channel) on the one hand, can by realizing energy-conservation to the adjustment of channel detection period, on the other hand base station also can by corresponding parameter notifications to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.Namely base station and terminal can simultaneously by realizing energy-conservation object to the adjustment of channel detection period.
In technique scheme, preferably, if the executive agent of described channel detection method is base station, then described channel detection method also comprises: described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
In this technical scheme, because base station is when channel idle being detected, terminal needs to detect PDCCH (Physical Downlink Control Channel, physical layer descending control channel), and when base station detects channel busy, terminal can be slept, to save power consumption, therefore when in base station execution Channel Detection, terminal does not need to perform Channel Detection, the parameter adjusted channel detection period can be sent to terminal by base station, by terminal to from adopt discontinuous receiving mode time wake-up time and adjust the length of one's sleep.Particularly, when base station detects channel busy, terminal enters sleep state, and determines according to the cycle of base station detection channel the time that terminal is waken up, determine base station again to the result of Channel Detection to wake up after sleep, and then determine to enter the dormant time next time.When the cycle that channel is detected in base station changes, the time that terminal is waken up after entering sleep state also suitably adjusts.
In technique scheme, preferably, if the executive agent of described channel detection method is terminal, then, before the step of described channel-monitoring subframe is set in described frame structure, also comprise: receive the described period 1 of base station transmission, described pre-determined number and described second round.
In this technical scheme, terminal is when performing Channel Detection, and base station can by the parameter notifications that adjusts channel detection period to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.
In technique scheme, preferably, the described second round arranged when base station performs described channel detection method is less than or equal to the described second round arranged when terminal performs described channel detection method.In this technical scheme, because the traffic carrying capacity of base station is more compared to terminal, therefore in order to ensure the data transmission efficiency of base station, the long period (i.e. second round) that can arrange base station execution Channel Detection is less than or equal to the long period that terminal performs Channel Detection.
Fig. 3 shows the schematic block diagram of the Channel Detection system of LTE system when unauthorized band operation according to an embodiment of the invention.
As shown in Figure 3, the Channel Detection system 300 of LTE system when unauthorized band operation according to an embodiment of the invention, comprising: the first setting unit 302, is the channel-monitoring subframe of channel status sense cycle for arranging in the frame structure of described LTE system with period 1; Judging unit 304 is whether the number of times of busy state reaches pre-determined number for judging that described channel-monitoring subframe is consecutively detected described channel status; Processing unit 306, for judge at described judging unit 304 described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
In this technical scheme, by arranging channel-monitoring subframe, channel status is detected, when making LTE system be operated in unauthorized frequency range, corresponding interference avoidance mechanism can be taked, namely can detect channel status, and transmit data when channel idle being detected, data are not transmitted when channel busy being detected, and then LTE system can be coexisted peacefully with the other system (as Wi-Fi system) being operated in unauthorized frequency range when unauthorized band operation, to guarantee under the prerequisite that LTE system normally can work in unauthorized frequency range, avoid LTE system when unauthorized band operation owing to there is no interference avoidance mechanism and larger interference is produced to the other system with interference avoidance mechanism.
By judge channel-monitoring subframe with the period 1 be consecutively detected channel status reach pre-determined number as the number of times of busy state time, the sense cycle of channel-monitoring subframe is adjusted to the second round being greater than the period 1, make when channel is taken for a long time by other system, the main body (base station and/or terminal) performing Channel Detection can detect channel with the longer cycle, when avoiding channel to be in busy state, Channel Detection main body continues carry out detecting with the less cycle and increase the power consumption of Channel Detection main body.
In technique scheme, preferably, described processing unit 306 also for: after the sense cycle of described channel-monitoring subframe is adjusted to described second round, if the sense cycle of described channel-monitoring subframe to detect that described channel status is for idle condition described second round, is then adjusted to the described period 1 by described second round by described channel-monitoring subframe.
In this technical scheme, by when channel-monitoring subframe is channel status to be detected second round for idle condition, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, make when channel is not taken for a long time, can, in time by the cycle that the period modulation of channel-monitoring subframe is less, avoid continuing to detect and the efficiency of influential system channel with the longer cycle.
In technique scheme, preferably, also comprise: determining unit 308, after the sense cycle of described channel-monitoring subframe being adjusted to described second round at described processing unit 306, determine whether new data to be transmitted; Described processing unit 306 also for, when described determining unit 308 defines new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
In this technical scheme, when there being new data to be transmitted, not only make data waiting for transmission more, and new data to be transmitted may be more responsive to time delay, therefore by when defining new data to be transmitted, the sense cycle of channel-monitoring subframe is adjusted to the period 1 by second round, makes it possible to detect channel with the less cycle, and then guarantee the data to be transmitted that process is new in time.
In technique scheme, preferably, also comprise: the second setting unit 310, for arranging described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.Preferably, described second setting unit 310 specifically for: if the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
Specifically, when the data volume of data to be transmitted is larger, in order to ensure the efficiency of system, need to detect channel with the less cycle, therefore pre-determined number can be set to higher value; And when the type of data to be transmitted is more responsive to time delay, in order to channel can be used as early as possible to send data to be transmitted, also needs to detect channel with the less cycle, therefore pre-determined number can be set to higher value.
In technique scheme, preferably, described second round is the integral multiple of described period 1.
Fig. 4 shows the schematic block diagram of base station according to an embodiment of the invention.
As shown in Figure 4, base station 400 according to an embodiment of the invention, comprising: the Channel Detection system 300 of LTE system when unauthorized band operation as shown in Figure 3.
In technique scheme, preferably, described base station 400 also comprises: the first notification unit 402, for described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
In this technical scheme, base station 400 is when detecting channel (up channel and/or down channel) on the one hand, can by realizing energy-conservation to the adjustment of channel detection period, on the other hand base station 400 also can by corresponding parameter notifications to terminal, energy-conservation to guarantee that terminal realizes when carrying out Channel Detection.Namely base station 400 and terminal can simultaneously by realizing energy-conservation object to the adjustment of channel detection period.
In technique scheme, preferably, described base station 400 also comprises: the second notification unit 404, for described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
In this technical scheme, because base station 400 is when channel idle being detected, terminal needs to detect PDCCH, and when base station 400 detects channel busy, terminal can be slept, and to save power consumption, therefore performs Channel Detection and terminal in base station 400 when not needing to perform Channel Detection, the parameter adjusted channel detection period can be sent to terminal by base station 400, by terminal to from adopt discontinuous receiving mode time wake-up time and adjust the length of one's sleep.Particularly, when base station 400 detects channel busy, terminal enters sleep state, and determines according to the cycle that channel is detected in base station 400 time that terminal is waken up, determine base station 400 again to the result of Channel Detection to wake up after sleep, and then determine to enter the dormant time next time.When the cycle that channel is detected in base station 400 changes, the time that terminal is waken up after entering sleep state also suitably adjusts.
Fig. 5 shows the schematic block diagram of terminal according to an embodiment of the invention.
As shown in Figure 5, terminal 500 according to an embodiment of the invention, comprising: the Channel Detection system 300 of LTE system when unauthorized band operation as shown in Figure 3.
In technique scheme, preferably, described terminal 500 also comprises: receiving element 502, for receiving the described period 1 of base station transmission, described pre-determined number and described second round.
In this technical scheme, terminal 500 is when performing Channel Detection, and base station can by the parameter notifications that adjusts channel detection period to terminal 500, energy-conservation to guarantee that terminal 500 realizes when carrying out Channel Detection.
In sum, a kind of energy-conservation LBT testing mechanism of major design of the present invention, mainly contain short period that LBT repeats detection time, long period that LBT repeats detection time and LBT repetition period detection time from the short period becomes macrocyclic criterion and LBT repetition period detection time becomes short-period criterion from long period, specific as follows:
LBT detection time repeats with certain cycle, for ease of illustrating, is short period T by this period definition s, such as 10ms.As shown in Figure 6, LBT executive agent (base station and/or terminal) is with short period T scarry out LBT detection.
In order to avoid LBT executive agent continue channel busy to be detected time, still frequently carry out Channel Detection, therefore can at LBT executive agent in a N continuous short period, when LBT testing result is channel busy, LBT being detected the repetition period is set to long period T l.
It is to be noted that
1, N value can get the natural number being more than or equal to 2, and can decide time delay sensitivity according to concrete traffic carrying capacity or business, and the large or business of such as traffic carrying capacity is to delay sensitive, then N value is larger; Otherwise N value can be less.
2, N value can have multiple candidate value, and which can carry out semi-static configuration in concrete use.
3, T lvalue is greater than T svalue, under preferable case, T lvalue can be T sthe integral multiple of value, such as more than 2 times or 2 times.
Wherein, if LBT detects the repetition period channel idle detected when being long period, then LBT can be detected the repetition period is adjusted to the short period by long period, otherwise LBT detects the repetition period and continues as long period.
Particularly, as shown in Figure 7, LBT executive agent is at 3 continuous short period T sdetect channel busy in LBT detection time in (as 10ms), then next LBT detects short period T sbe adjusted to long period T l(30ms), when at ensuing long period T llBT detect channel idle detection time, then LBT detects long period T lbecome short period T s.
In addition, LBT sense cycle is being adjusted to long period T lafterwards, if receive new business, then LBT sense cycle can be adjusted to short period T s.
Preferably, base station as LBT executive agent be arrange LBT detect long period than terminal as LBT executive agent be arrange LBT detect long period short.
Base station needs to use RRC signaling or other signalings that the times N that LBT detects the short period, the continuous testing result of LBT is channel busy of base station and terminal and LBT are detected long period to inform to terminal, perform Channel Detection or arrange from the wake-up time in time adopting the work of discontinuous receiving mode and the length of one's sleep to make terminal.
More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes the Channel Detection scheme of a kind of new LTE system when unauthorized band operation, under the prerequisite normally worked in unauthorized frequency range in LTE system can be guaranteed, avoid LTE system to produce larger interference when unauthorized band operation to other system, reduce power consumption when terminal and/or base station execution Channel Detection simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (21)

1. the channel detection method of LTE system when unauthorized band operation, is characterized in that, comprising:
Arranging in the frame structure of described LTE system with period 1 is the channel-monitoring subframe of channel status sense cycle;
Judging that described channel-monitoring subframe is consecutively detected described channel status is whether the number of times of busy state reaches pre-determined number;
Judge described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
2. the channel detection method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprises:
When described channel-monitoring subframe detects described channel status for idle condition with described second round, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
3. the channel detection method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, after the sense cycle of described channel-monitoring subframe is adjusted to described second round, also comprises:
When defining new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
4. the channel detection method of LTE system according to claim 1 when unauthorized band operation, it is characterized in that, arrange described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.
5. the channel detection method of LTE system according to claim 4 when unauthorized band operation, is characterized in that:
If the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
6. the channel detection method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, described second round is the integral multiple of described period 1.
7. the channel detection method of LTE system according to any one of claim 1 to 6 when unauthorized band operation, is characterized in that, if the executive agent of described channel detection method is base station, then described channel detection method also comprises:
Described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
8. the channel detection method of LTE system according to any one of claim 1 to 6 when unauthorized band operation, is characterized in that, if the executive agent of described channel detection method is base station, then described channel detection method also comprises:
Described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
9. the channel detection method of LTE system according to any one of claim 1 to 6 when unauthorized band operation, it is characterized in that, if the executive agent of described channel detection method is terminal, then, before the step of described channel-monitoring subframe is set in described frame structure, also comprise:
Receive the described period 1 of base station transmission, described pre-determined number and described second round.
10. the channel detection method of LTE system according to any one of claim 1 to 6 when unauthorized band operation, is characterized in that:
The described second round that base station is arranged when performing described channel detection method is less than or equal to the described second round arranged when terminal performs described channel detection method.
The Channel Detection system of 11. 1 kinds of LTE system when unauthorized band operation, is characterized in that, comprising:
First setting unit is the channel-monitoring subframe of channel status sense cycle for arranging in the frame structure of described LTE system with period 1;
Judging unit is whether the number of times of busy state reaches pre-determined number for judging that described channel-monitoring subframe is consecutively detected described channel status;
Processing unit, for judge at described judging unit described channel-monitoring subframe be consecutively detected described channel status reach described pre-determined number as the number of times of busy state time, the sense cycle of described channel-monitoring subframe is adjusted to the second round being greater than the described period 1.
The Channel Detection system of 12. LTE system according to claim 11 when unauthorized band operation, is characterized in that, described processing unit also for:
After the sense cycle of described channel-monitoring subframe is adjusted to described second round, if the sense cycle of described channel-monitoring subframe to detect that described channel status is for idle condition described second round, is then adjusted to the described period 1 by described second round by described channel-monitoring subframe.
The Channel Detection system of 13. LTE system according to claim 11 when unauthorized band operation, is characterized in that, also comprise:
Determining unit, after the sense cycle of described channel-monitoring subframe being adjusted to described second round at described processing unit, determines whether new data to be transmitted;
Described processing unit also for, when described determining unit defines new data to be transmitted, the sense cycle of described channel-monitoring subframe is adjusted to the described period 1 by described second round.
The Channel Detection system of 14. LTE system according to claim 11 when unauthorized band operation, is characterized in that, also comprise:
Second setting unit, for arranging described pre-determined number according to the data volume size of data to be transmitted and/or the type of data to be transmitted, wherein, described pre-determined number is more than or equal to 2 times.
The Channel Detection system of 15. LTE system according to claim 14 when unauthorized band operation, is characterized in that, described second setting unit specifically for:
If the data volume of described data to be transmitted is larger, and/or the type of described data to be transmitted is more responsive to time delay, then the described pre-determined number arranged is larger.
The Channel Detection system of 16. LTE system according to claim 11 when unauthorized band operation, is characterized in that, described second round is the integral multiple of described period 1.
17. 1 kinds of base stations, is characterized in that, comprising: the Channel Detection system of the LTE system according to any one of claim 11 to 16 when unauthorized band operation.
18. base stations according to claim 17, is characterized in that, also comprise:
First notification unit, for described period 1, described pre-determined number and described second round are informed to terminal, with make described terminal according to the described period 1, described pre-determined number and described second round the state to up channel detect.
19. base stations according to claim 17, is characterized in that, also comprise:
Second notification unit, for described period 1, described pre-determined number and described second round are informed to terminal, to make described terminal according to the wake-up time arranged described period 1, described pre-determined number and described second round when described terminal adopts discontinuous receiving mode and the length of one's sleep.
20. 1 kinds of terminals, is characterized in that, comprising: the Channel Detection system of the LTE system according to any one of claim 11 to 16 when unauthorized band operation.
21. terminals according to claim 20, is characterized in that, also comprise:
Receiving element, for receiving the described period 1 of base station transmission, described pre-determined number and described second round.
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CN109688626B (en) * 2018-12-10 2021-10-22 中国科学院上海微系统与信息技术研究所 Listen before talk parameter configuration method of frame-based equipment
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