CN104363657A - Device with base station function and method and system for data transmission - Google Patents
Device with base station function and method and system for data transmission Download PDFInfo
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- CN104363657A CN104363657A CN201410625760.1A CN201410625760A CN104363657A CN 104363657 A CN104363657 A CN 104363657A CN 201410625760 A CN201410625760 A CN 201410625760A CN 104363657 A CN104363657 A CN 104363657A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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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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Abstract
The invention provides a device with a base station function and a method and a system for data transmission when an LTE (long-term evolution) system works in an unauthorized frequency band. The data transmission method includes: setting a channel monitoring subframe for periodically detecting the state of a downlink channel in a frame structure of the LTE system; within any period, if the channel monitoring subframe detects that the downlink channel is in the idle state, continuing detecting the state of the downlink state within set back-off time; if the downlink channel is detected to be in the idle state still within the back-off time, sending downlink data through a downlink subframe within any period. Under the premise that the LTE system works normally in the unauthorized frequency band, large interference on other systems with interference avoidance mechanisms when the LTE system works in the unauthorized frequency band is avoided, and the problem that the devices with the base station function belonging to different operators send data simultaneously resulting in collision due to the fact that channel measurement is performed at the same time is avoided as well.
Description
Technical field
The present invention relates to communication technical field, in particular to the data transmission method of a kind of LTE system when unauthorized band operation, a kind of LTE system at unauthorized band operation time data transmission system to unify a kind of equipment with base station functions.
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 (Carrier Aggregation, 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.For this problem, propose when LTE system is operated in unauthorized frequency range in correlation technique, to the scheme that channel status detects, namely send data again when channel idle being detected, otherwise do not send.But, as shown in Figure 2, if the time that Channel Detection is done in the base station of different operators is identical, so when the base station of different operators all detects channel idle, data can be sent simultaneously, cause and produce collision each other.
Therefore, under how can guaranteeing the prerequisite that LTE system normally works in unauthorized frequency range, avoid LTE system to produce larger interference when unauthorized band operation to other system, avoid simultaneously the base station of different operators due to time of doing channel measurement identical and occur sending data simultaneously and cause producing collision and become technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention just based on above-mentioned technical problem one of at least, propose a kind of data transmission scheme of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation newly, under the prerequisite that LTE system normally can work in unauthorized frequency range can be guaranteed, 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, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
In view of this, according to a first aspect of the invention, propose a kind of data transmission method of LTE system when unauthorized band operation being applicable to have the equipment of base station functions, comprising: the channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system; Within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then in the back off time arranged, continue the state detecting described down channel; If still detect in described back off time, described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and when channel-monitoring subframe detects that down channel is in idle condition, continue to detect the state of down channel in the back off time arranged, make the equipment with base station functions belonging to different operators do time of Channel Detection identical and channel idle detected simultaneously time, also can cause by continuing to detect channel avoid sending data in back off time simultaneously and produce collision each other.Namely in this technical scheme, for the LTE system being operated in unauthorized frequency range, be provided with dual interference avoidance mechanism, namely the interference between LTE system and the other system (as Wi-Fi system) being operated in unauthorized frequency range, and the interference between the LTE system of different operators, under guaranteeing 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, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, also comprise: within described arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in busy state, and/or in described back off time, detect that described down channel is in busy state, then within described arbitrary cycle, do not send downlink data.
In this technical scheme, by within arbitrary cycle, if channel-monitoring subframe detects that down channel does not send downlink data when being in busy state, the other system to being operated in unauthorized frequency range can be avoided to cause interference; And by detecting that in back off time down channel does not send downlink data yet when being in busy state, the time owing to doing channel measurement between the equipment with base station functions can avoiding belonging to different operators is identical and occur sending the problem that data produce collision simultaneously.
In technique scheme, preferably, also comprise: described back off time is set at random; Or obtain the described back off time with the equipment setting of base station functions belonging to other operators, the described back off time of self is set according to the described back off time with the equipment setting of base station functions belonging to other operators described.
In this technical scheme, due to back off time to arrange scope larger, namely can be more than or equal to 0 millisecond and be less than 1 millisecond, therefore, if the equipment with base station functions belonging to different operators arranges back off time at random, can ensure that the back off time selected is different to a certain extent, and then can ensure belong to an operator there is the equipment sending data of base station functions time, the equipment with base station functions belonging to another operator does not send data, avoid belong to different operators the equipment with base station functions between send data and the collision problem produced simultaneously.Certainly, the back off time arranged in order to avoid the equipment with base station functions belonging to different operators is identical, and the back off time of back off time to self that also can be arranged according to the equipment with base station functions belonging to other operators by each equipment with base station functions is arranged.
In technique scheme, preferably, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond; The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
In technique scheme, preferably, after the descending sub frame be in by described frame structure in described arbitrary cycle sends the step of downlink data, also comprise: judge whether the data volume of the described downlink data sent reaches predetermined value, if so, then stop sending described downlink data within described arbitrary cycle.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
According to a further aspect in the invention, also proposed the data transmission method of LTE system when unauthorized band operation that another kind is applicable to have the equipment of base station functions, comprise: the channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described, within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and the detection initial time of channel-monitoring subframe within each cycle of different operators configuration is identical, but detection time, length was different, even if make the equipment with base station functions belonging to different operators do Channel Detection simultaneously, also different channel detection result can be drawn because length detection time is different, and then it is also identical and send data and cause the problem producing collision each other that the equipment with base station functions belonging to different operators can be avoided within each cycle to do the initial time of Channel Detection length identical and detection time simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
In this technical scheme, belong to the average detected time span of the channel-monitoring subframe with the Equipments Setting of base station functions within multiple cycle of different operators identical time, the fairness of equipment to Channel Detection with base station functions belonging to different operators can be ensured, the device A time that configurating channel monitoring subframe takies in one-period even with base station functions is T1, the equipment B time that configurating channel monitoring subframe takies in one-period with base station functions is T2, then in second period, the time that the configurable channel-monitoring subframe of device A with base station functions takies is T2, the time that the configurable channel-monitoring subframe of equipment B with base station functions takies is T1.
In technique scheme, preferably, after the descending sub frame be in by described frame structure in described arbitrary cycle sends the step of downlink data, also comprise: judge whether the data volume of the described downlink data sent reaches predetermined value, if so, then stop sending described downlink data within described arbitrary cycle.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
According to a third aspect of the invention we, also proposed a kind of data transmission system of LTE system when unauthorized band operation being applicable to have the equipment of base station functions, comprise: the first setting unit, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system; Detecting unit, for detecting the state of described down channel by described channel-monitoring period of sub-frame, and within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then in the back off time arranged, continue the state detecting described down channel; Processing unit, for when described detecting unit still detects that described down channel is in idle condition in described back off time, sends downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and when channel-monitoring subframe detects that down channel is in idle condition, continue to detect the state of down channel in the back off time arranged, make the equipment with base station functions belonging to different operators do time of Channel Detection identical and channel idle detected simultaneously time, also can cause by continuing to detect channel avoid sending data in back off time simultaneously and produce collision each other.Namely in this technical scheme, for the LTE system being operated in unauthorized frequency range, be provided with dual interference avoidance mechanism, namely the interference between LTE system and the other system (as Wi-Fi system) being operated in unauthorized frequency range, and the interference between the LTE system of different operators, under guaranteeing 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, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, described processing unit also for: within described arbitrary cycle, if by described channel-monitoring subframe, described detecting unit detects that described down channel is in busy state, and/or described detecting unit detects that in described back off time described down channel is in busy state, then do not send downlink data within described arbitrary cycle.
In this technical scheme, by within arbitrary cycle, if channel-monitoring subframe detects that down channel does not send downlink data when being in busy state, the other system to being operated in unauthorized frequency range can be avoided to cause interference; And by detecting that in back off time down channel does not send downlink data yet when being in busy state, the time owing to doing channel measurement between the equipment with base station functions can avoiding belonging to different operators is identical and occur sending the problem that data produce collision simultaneously.
In technique scheme, preferably, also comprise: the second setting unit, for arranging described back off time at random; Or acquiring unit, for obtaining the described back off time with the equipment setting of base station functions belonging to other operators; 3rd setting unit, the described back off time that the equipment with base station functions belonging to other operators described for getting according to described acquiring unit is arranged arranges self described back off time.
In this technical scheme, due to back off time to arrange scope larger, namely can be more than or equal to 0 millisecond and be less than 1 millisecond, therefore, if the equipment with base station functions belonging to different operators arranges back off time at random, can ensure that the back off time selected is different to a certain extent, and then can ensure belong to an operator there is the equipment sending data of base station functions time, the equipment with base station functions belonging to another operator does not send data, avoid belong to different operators the equipment with base station functions between send data and the collision problem produced simultaneously.Certainly, the back off time arranged in order to avoid the equipment with base station functions belonging to different operators is identical, and the back off time of back off time to self that also can be arranged according to the equipment with base station functions belonging to other operators by each equipment with base station functions is arranged.
In technique scheme, preferably, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond; The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
In technique scheme, preferably, also comprise: judging unit, for judging whether the data volume of the described downlink data sent reaches predetermined value; Described processing unit also for, when described judging unit judges that the data volume of the described downlink data sent reaches described predetermined value, within described arbitrary cycle stop send described downlink data.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
According to a forth aspect of the invention, also proposed the data transmission system of LTE system when unauthorized band operation that another kind is applicable to have the equipment of base station functions, comprise: setting unit, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described, processing unit, for within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and the detection initial time of channel-monitoring subframe within each cycle of different operators configuration is identical, but detection time, length was different, even if make the equipment with base station functions belonging to different operators do Channel Detection simultaneously, also different channel detection result can be drawn because length detection time is different, and then it is also identical and send data and cause the problem producing collision each other that the equipment with base station functions belonging to different operators can be avoided within each cycle to do the initial time of Channel Detection length identical and detection time simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
In this technical scheme, belong to the average detected time span of the channel-monitoring subframe with the Equipments Setting of base station functions within multiple cycle of different operators identical time, the fairness of equipment to Channel Detection with base station functions belonging to different operators can be ensured, the device A time that configurating channel monitoring subframe takies in one-period even with base station functions is T1, the equipment B time that configurating channel monitoring subframe takies in one-period with base station functions is T2, then in second period, the time that the configurable channel-monitoring subframe of device A with base station functions takies is T2, the time that the configurable channel-monitoring subframe of equipment B with base station functions takies is T1.
In technique scheme, preferably, also comprise: judging unit, for judging whether the data volume of the described downlink data sent reaches predetermined value; Described processing unit also for, when described judging unit judges that the data volume of the described downlink data sent reaches described predetermined value, within described arbitrary cycle stop send described downlink data.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
According to a fifth aspect of the invention, also proposed a kind of equipment with base station functions, comprising: the data transmission system of LTE system when unauthorized band operation described in above-mentioned any one technical scheme.
By above technical scheme, under the prerequisite that LTE system normally can work in unauthorized frequency range can be guaranteed, avoid LTE system when unauthorized band operation owing to there is no interference avoidance mechanism and larger interference produced to the other system with interference avoidance mechanism, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
Accompanying drawing explanation
Regular schematic diagram is avoided in the interference that Fig. 1 shows Wi-Fi system;
Fig. 2 shows the schematic diagram collided between the base station of different operators in existing scheme;
Fig. 3 shows the schematic flow diagram being applicable to have the data transmission method of LTE system when unauthorized band operation of the equipment of base station functions according to an embodiment of the invention;
Fig. 4 shows the schematic block diagram being applicable to have the data transmission system of LTE system when unauthorized band operation of the equipment of base station functions according to an embodiment of the invention;
Fig. 5 shows the schematic flow diagram of the data transmission method of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation according to another embodiment of the invention;
Fig. 6 shows the schematic block diagram of the data transmission system of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation according to another embodiment of the invention;
Fig. 7 shows the frame structure schematic diagram of LTE system according to an embodiment of the invention;
Schematic diagram is avoided in interference between the equipment with base station functions that Fig. 8 shows different operators according to an embodiment of the invention;
Schematic diagram is avoided in interference between the equipment with base station functions that Fig. 9 shows different operators according to another embodiment of the invention.
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. 3 shows the schematic flow diagram being applicable to have the data transmission method of LTE system when unauthorized band operation of the equipment of base station functions according to an embodiment of the invention.
As shown in Figure 3, the data transmission method of LTE system when unauthorized band operation being applicable to the equipment with base station functions according to an embodiment of the invention, comprise: step 302, the channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system; Step 304, within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then continues the state detecting described down channel in the back off time arranged; Step 306, if still detect in described back off time, described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and when channel-monitoring subframe detects that down channel is in idle condition, continue to detect the state of down channel in the back off time arranged, make the equipment with base station functions belonging to different operators do time of Channel Detection identical and channel idle detected simultaneously time, also can cause by continuing to detect channel avoid sending data in back off time simultaneously and produce collision each other.Namely in this technical scheme, for the LTE system being operated in unauthorized frequency range, be provided with dual interference avoidance mechanism, namely the interference between LTE system and the other system (as Wi-Fi system) being operated in unauthorized frequency range, and the interference between the LTE system of different operators, under guaranteeing 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, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, also comprise: within described arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in busy state, and/or in described back off time, detect that described down channel is in busy state, then within described arbitrary cycle, do not send downlink data.
In this technical scheme, by within arbitrary cycle, if channel-monitoring subframe detects that down channel does not send downlink data when being in busy state, the other system to being operated in unauthorized frequency range can be avoided to cause interference; And by detecting that in back off time down channel does not send downlink data yet when being in busy state, the time owing to doing channel measurement between the equipment with base station functions can avoiding belonging to different operators is identical and occur sending the problem that data produce collision simultaneously.
In technique scheme, preferably, also comprise: described back off time is set at random; Or obtain the described back off time with the equipment setting of base station functions belonging to other operators, the described back off time of self is set according to the described back off time with the equipment setting of base station functions belonging to other operators described.
In this technical scheme, due to back off time to arrange scope larger, namely can be more than or equal to 0 millisecond and be less than 1 millisecond, therefore, if the equipment with base station functions belonging to different operators arranges back off time at random, can ensure that the back off time selected is different to a certain extent, and then can ensure belong to an operator there is the equipment sending data of base station functions time, the equipment with base station functions belonging to another operator does not send data, avoid belong to different operators the equipment with base station functions between send data and the collision problem produced simultaneously.Certainly, the back off time arranged in order to avoid the equipment with base station functions belonging to different operators is identical, and the back off time of back off time to self that also can be arranged according to the equipment with base station functions belonging to other operators by each equipment with base station functions is arranged.
In technique scheme, preferably, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond; The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
In technique scheme, preferably, after the descending sub frame be in by described frame structure in described arbitrary cycle sends the step of downlink data, also comprise: judge whether the data volume of the described downlink data sent reaches predetermined value, if so, then stop sending described downlink data within described arbitrary cycle.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
Fig. 4 shows the schematic block diagram being applicable to have the data transmission system of LTE system when unauthorized band operation of the equipment of base station functions according to an embodiment of the invention.
As shown in Figure 4, the data transmission system 400 of LTE system when unauthorized band operation being applicable to the equipment with base station functions according to an embodiment of the invention, comprise: the first setting unit 402, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system; Detecting unit 404, for detecting the state of described down channel by described channel-monitoring period of sub-frame, and within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then in the back off time arranged, continue the state detecting described down channel; Processing unit 406, for when described detecting unit 404 still detects that described down channel is in idle condition in described back off time, sends downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and when channel-monitoring subframe detects that down channel is in idle condition, continue to detect the state of down channel in the back off time arranged, make the equipment with base station functions belonging to different operators do time of Channel Detection identical and channel idle detected simultaneously time, also can cause by continuing to detect channel avoid sending data in back off time simultaneously and produce collision each other.Namely in this technical scheme, for the LTE system being operated in unauthorized frequency range, be provided with dual interference avoidance mechanism, namely the interference between LTE system and the other system (as Wi-Fi system) being operated in unauthorized frequency range, and the interference between the LTE system of different operators, under guaranteeing 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, it also avoid simultaneously belong to different operators the equipment with base station functions between due to time of doing channel measurement identical and occur sending the problem that data produce collision simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, described processing unit 406 also for: within described arbitrary cycle, if by described channel-monitoring subframe, described detecting unit 404 detects that described down channel is in busy state, and/or described detecting unit 404 detects that in described back off time described down channel is in busy state, then do not send downlink data within described arbitrary cycle.
In this technical scheme, by within arbitrary cycle, if channel-monitoring subframe detects that down channel does not send downlink data when being in busy state, the other system to being operated in unauthorized frequency range can be avoided to cause interference; And by detecting that in back off time down channel does not send downlink data yet when being in busy state, the time owing to doing channel measurement between the equipment with base station functions can avoiding belonging to different operators is identical and occur sending the problem that data produce collision simultaneously.
In technique scheme, preferably, also comprise: the second setting unit 408, for arranging described back off time at random; Or acquiring unit 410, for obtaining the described back off time with the equipment setting of base station functions belonging to other operators; 3rd setting unit 412, the described back off time that the equipment with base station functions belonging to other operators described for getting according to described acquiring unit 410 is arranged arranges self described back off time.
In this technical scheme, due to back off time to arrange scope larger, namely can be more than or equal to 0 millisecond and be less than 1 millisecond, therefore, if the equipment with base station functions belonging to different operators arranges back off time at random, can ensure that the back off time selected is different to a certain extent, and then can ensure belong to an operator there is the equipment sending data of base station functions time, the equipment with base station functions belonging to another operator does not send data, avoid belong to different operators the equipment with base station functions between send data and the collision problem produced simultaneously.Certainly, the back off time arranged in order to avoid the equipment with base station functions belonging to different operators is identical, and the back off time of back off time to self that also can be arranged according to the equipment with base station functions belonging to other operators by each equipment with base station functions is arranged.
In technique scheme, preferably, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond; The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
In technique scheme, preferably, also comprise: judging unit 414, for judging whether the data volume of the described downlink data sent reaches predetermined value; Described processing unit 406 also for, when described judging unit judges that the data volume of the described downlink data sent reaches described predetermined value, within described arbitrary cycle stop send described downlink data.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
Fig. 5 shows the schematic flow diagram of the data transmission method of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation according to another embodiment of the invention.
As shown in Figure 5, the data transmission method of the LTE system being applicable to the equipment with base station functions when unauthorized band operation according to another embodiment of the invention, comprise: step 502, the channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described, step 504, within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and the detection initial time of channel-monitoring subframe within each cycle of different operators configuration is identical, but detection time, length was different, even if make the equipment with base station functions belonging to different operators do Channel Detection simultaneously, also different channel detection result can be drawn because length detection time is different, and then it is also identical and send data and cause the problem producing collision each other that the equipment with base station functions belonging to different operators can be avoided within each cycle to do the initial time of Channel Detection length identical and detection time simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised macro base station and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
In this technical scheme, belong to the average detected time span of the channel-monitoring subframe with the Equipments Setting of base station functions within multiple cycle of different operators identical time, the fairness of equipment to Channel Detection with base station functions belonging to different operators can be ensured, the device A time that configurating channel monitoring subframe takies in one-period even with base station functions is T1, the equipment B time that configurating channel monitoring subframe takies in one-period with base station functions is T2, then in second period, the time that the configurable channel-monitoring subframe of device A with base station functions takies is T2, the time that the configurable channel-monitoring subframe of equipment B with base station functions takies is T1.
In technique scheme, preferably, after the descending sub frame be in by described frame structure in described arbitrary cycle sends the step of downlink data, also comprise: judge whether the data volume of the described downlink data sent reaches predetermined value, if so, then stop sending described downlink data within described arbitrary cycle.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can when the equipment with base station functions of different system or different operators is all larger to the demand of channel, can suitable scheduling be carried out, avoid the long-time busy channel of the equipment with base station functions of a system or an operator and affect the operating efficiency that other system or other operators have the equipment of base station functions.
Fig. 6 shows the schematic block diagram of the data transmission system of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation according to another embodiment of the invention.
As shown in Figure 6, the data transmission system 600 of the LTE system being applicable to the equipment with base station functions according to another embodiment of the invention when unauthorized band operation, comprise: setting unit 602, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described, processing unit 604, for within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
In this technical scheme, detect by arranging the state of channel-monitoring subframe to down channel in the frame structure of LTE system, and the detection initial time of channel-monitoring subframe within each cycle of different operators configuration is identical, but detection time, length was different, even if make the equipment with base station functions belonging to different operators do Channel Detection simultaneously, also different channel detection result can be drawn because length detection time is different, and then it is also identical and send data and cause the problem producing collision each other that the equipment with base station functions belonging to different operators can be avoided within each cycle to do the initial time of Channel Detection length identical and detection time simultaneously.
Wherein, above-mentioned downlink data had both comprised common interaction data, also comprised control signal etc.Those skilled in the art is also appreciated that the microcell base station etc. that the equipment with base station functions described in the present invention is comprised all macro base stations and realized by communication equipment (as smart mobile phone etc.).
In technique scheme, preferably, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
In this technical scheme, belong to the average detected time span of the channel-monitoring subframe with the Equipments Setting of base station functions within multiple cycle of different operators identical time, the fairness of equipment to Channel Detection with base station functions belonging to different operators can be ensured, the device A time that configurating channel monitoring subframe takies in one-period even with base station functions is T1, the equipment B time that configurating channel monitoring subframe takies in one-period with base station functions is T2, then in second period, the time that the configurable channel-monitoring subframe of device A with base station functions takies is T2, the time that the configurable channel-monitoring subframe of equipment B with base station functions takies is T1.
In technique scheme, preferably, also comprise: judging unit 606, for judging whether the data volume of the described downlink data sent reaches predetermined value; Described processing unit 604 also for, when described judging unit 606 judges that the data volume of the described downlink data sent reaches described predetermined value, within described arbitrary cycle stop send described downlink data.
In this technical scheme, by judging the downlink data amount sent, the data volume made it possible to the equipment with base station functions sends in one-period controls, and then can different system or belong to the equipment with base station functions of different operators all larger to the demand of channel time, can suitable scheduling be carried out, avoid a system or belong to the long-time busy channel of the equipment with base station functions of an operator and affect other system or belong to the operating efficiency that other operators have the equipment of base station functions.
The invention allows for a kind of equipment (not shown) with base station functions, comprise: the data transmission system 400 of LTE system as shown in Figure 4 when unauthorized band operation, or the data transmission system 600 of LTE system as shown in Figure 6 when unauthorized band operation.
Particularly, the present invention mainly for the collision between LAA system and LAA to the collision problem of Wi-Fi, propose backoff (keeping out of the way) mechanism and dynamic LBT (Listen BeforeTalk) time span mechanism, make on the basis of LBT, to reduce different operators base station further (for ease of describing, all set forth for base station below, those skilled in the art it will be appreciated that base station can be all equipment with base station functions) between collision probability.
Concrete scheme of the present invention is as follows:
Method one: based on the random backoff time
In LAA system, LBT detection channel status does not send data after being the free time immediately, but the backoff time of Stochastic choice, in the backoff time, if LBT detects channel status or free time, then after the backoff time terminates, send data.
Particularly, as shown in Figure 7, in a LBT cycle t3, within the t1 time, do channel measurement, namely LBT subframe holding time is t1, and arranging the backoff time is t2, if both channel idle detected within the t1 time, within the t2 time, channel idle detected again, then can send downlink data.
Wherein, the time span t2 that backoff takies is between 0 millisecond to 1 millisecond.By arranging backoff mechanism, even if make the base station of A operator the same with length with the LBT time of the base station of B operator, so after the base station of A and B operator all detects channel idle, if both Stochastic choice backoff time, the probability so selecting the backoff time different is very large.As shown in Figure 8, the backoff time (t2) of the base station of such as A operator choosing is shorter, and backoff time of the base station choosing of B operator (t2 ') longer.If the base station of A operator is within the backoff time, find that LBT detects channel or free time, so the base station of A operator is after the backoff time terminates, and sends data.And the base station of B operator during backoff because the base station of A operator sends data, the LBT testing result of the base station of B operator is made to become channel busy, so the base station of B operator can not send data within this cycle, doing so avoids collision.
Certainly, the backoff time arranged between the base station of different operators may not be Stochastic choice, but directly carry out arranging, namely directly for the base station of different operators arranges the different backoff time.
Method two: dynamic LBT time span mechanism
LBT starting point detection time arranging the base station of different operators is the same, but LBT length detection time is different, and LBT length detection time in same operator different LBT cycle occurs in turn.
Particularly, as shown in Figure 9, such as three operators, so arrange three LBT length detection time, are designated as 1,2,3.First LBT detection time, LBT length detection time of A, B, C operator is respectively 1,2,3; In second sense cycle, LBT length detection time is respectively 2,3,1; In 3rd sense cycle, LBT length detection time is respectively 3,1,2.And carry out repetition by said process.
In this case, different operators needs to select different LBT length detection time, when there being data to send, and the maximum probability of the busy channel that LBT detection time is the shortest.But because LBT length detection time is in change, that is each operator is large at the probability of one-period busy channel, and the probability of another cycle busy channel is just little, so be also fair.
In addition, for above-mentioned two kinds of methods, the data volume that base station sends in one-period can also be controlled, and then can the base station of different operators all larger to the demand of channel time, can suitable scheduling be carried out, avoid the long-time busy channel in the base station of an operator and affect the operating efficiency of other operator base stations.
More than be described with reference to the accompanying drawings technical scheme of the present invention, propose a kind of data transmission scheme of the LTE system being applicable to have the equipment of base station functions when unauthorized band operation newly, under the prerequisite that LTE system normally can work in unauthorized frequency range can be guaranteed, 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, time owing to doing channel measurement simultaneously between the equipment with base station functions that it also avoid different operators is identical and occur sending the problem that data produce collision 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 (15)
1. the data transmission method of LTE system when unauthorized band operation, is applicable to the equipment with base station functions, it is characterized in that, comprising:
The channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system;
Within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then in the back off time arranged, continue the state detecting described down channel;
If still detect in described back off time, described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
2. the data transmission method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, also comprise:
Within described arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in busy state, and/or in described back off time, detect that described down channel is in busy state, then within described arbitrary cycle, do not send downlink data.
3. the data transmission method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, also comprise:
Described back off time is set at random; Or
Obtain the described back off time with the equipment setting of base station functions belonging to other operators, the described back off time of self is set according to the described back off time with the equipment setting of base station functions belonging to other operators described.
4. the data transmission method of LTE system according to any one of claim 1 to 3 when unauthorized band operation, is characterized in that, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond;
The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
5. the data transmission method of LTE system when unauthorized band operation, is applicable to the equipment with base station functions, it is characterized in that, comprising:
The channel-monitoring subframe being used for periodically detecting downlink channel condition is set in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described;
Within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
6. the data transmission method of LTE system according to claim 5 when unauthorized band operation, it is characterized in that, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
7. the data transmission method of LTE system when unauthorized band operation according to claim 1 or 5, is characterized in that, after the descending sub frame be in described arbitrary cycle sends the step of downlink data in by described frame structure, also comprises:
Judge whether the data volume of the described downlink data sent reaches predetermined value, if so, then stop sending described downlink data within described arbitrary cycle.
8. the data transmission system of LTE system when unauthorized band operation, is applicable to the equipment with base station functions, it is characterized in that, comprising:
First setting unit, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system;
Detecting unit, for detecting the state of described down channel by described channel-monitoring period of sub-frame, and within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then in the back off time arranged, continue the state detecting described down channel;
Processing unit, for when described detecting unit still detects that described down channel is in idle condition in described back off time, sends downlink data by the descending sub frame be in described frame structure in described arbitrary cycle.
9. the data transmission system of LTE system according to claim 8 when unauthorized band operation, is characterized in that, described processing unit also for:
Within described arbitrary cycle, if by described channel-monitoring subframe, described detecting unit detects that described down channel is in busy state, and/or described detecting unit detects that in described back off time described down channel is in busy state, then do not send downlink data within described arbitrary cycle.
10. the data transmission system of LTE system according to claim 8 when unauthorized band operation, is characterized in that, also comprise:
Second setting unit, for arranging described back off time at random; Or
Acquiring unit, for obtaining the described back off time with the equipment setting of base station functions belonging to other operators; 3rd setting unit, the described back off time that the equipment with base station functions belonging to other operators described for getting according to described acquiring unit is arranged arranges self described back off time.
The data transmission system of LTE system according to any one of 11. according to Claim 8 to 10 when unauthorized band operation, is characterized in that, the time that described back off time takies in described frame structure is more than or equal to 0 millisecond and is less than 1 millisecond;
The time that described channel-monitoring subframe takies in described frame structure is greater than 0 millisecond and is less than 1 millisecond.
The data transmission system of 12. 1 kinds of LTE system when unauthorized band operation, is applicable to the equipment with base station functions, it is characterized in that, comprising:
Setting unit, for arranging the channel-monitoring subframe being used for periodically detecting downlink channel condition in the frame structure of described LTE system, the detection initial time of described channel-monitoring subframe within each cycle is identical with the detection initial time of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators, and the detection time length of described channel-monitoring subframe within described each cycle is different from the detection time length of described channel-monitoring subframe within each cycle with the Equipments Setting of base station functions belonging to other operators described,
Processing unit, for within arbitrary cycle, if described channel-monitoring subframe detects that described down channel is in idle condition, then send downlink data by the descending sub frame be in described frame structure in described arbitrary cycle, otherwise, within described arbitrary cycle, do not send downlink data.
The data transmission system of 13. LTE system according to claim 12 when unauthorized band operation, it is characterized in that, the average detected time span of described channel-monitoring subframe within multiple cycle is identical with the average detected time span of described channel-monitoring subframe within described multiple cycle with the Equipments Setting of base station functions belonging to other operators described.
The data transmission system of LTE system described in 14. according to Claim 8 or 12 when unauthorized band operation, is characterized in that, also comprise:
Judging unit, for judging whether the data volume of the described downlink data sent reaches predetermined value;
Described processing unit also for, when described judging unit judges that the data volume of the described downlink data sent reaches described predetermined value, within described arbitrary cycle stop send described downlink data.
15. 1 kinds of equipment with base station functions, is characterized in that, comprising: the data transmission system of the LTE system according to any one of claim 8 to 14 when unauthorized band operation.
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