CN105376862A - Adjustable contention window-based method and device for transmitting data through permission-free channel - Google Patents

Adjustable contention window-based method and device for transmitting data through permission-free channel Download PDF

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Publication number
CN105376862A
CN105376862A CN201410429228.2A CN201410429228A CN105376862A CN 105376862 A CN105376862 A CN 105376862A CN 201410429228 A CN201410429228 A CN 201410429228A CN 105376862 A CN105376862 A CN 105376862A
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China
Prior art keywords
grant channel
condition
busy
node
indication information
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CN201410429228.2A
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Chinese (zh)
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CN105376862B (en
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韩锋
T·胡
黄晟锋
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上海贝尔股份有限公司
阿尔卡特朗讯
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Priority to CN201410429228.2A priority Critical patent/CN105376862B/en
Publication of CN105376862A publication Critical patent/CN105376862A/en
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Publication of CN105376862B publication Critical patent/CN105376862B/en

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Abstract

The invention provides a method and a device for enabling the communication at the nodes of a communication system. The method comprises the steps of acquiring the size of an adjustable contention window CW when data are to be transmitted among nodes through a permission-free channel; selecting a random value from the range of [0, CW] after waiting for a predetermined period of time T0; after the predetermined period of time T0, progressively decreasing the above random value during each time slot on the condition that the permission-free channel is in an idle state; on the condition that the permission-free channel is in a busy state, stopping the progressively decreasing action till the permission-free channel is in the idle state again, and continuously and progressively decreasing the above random value during each time slot after the predetermined period of time T0; on the condition that the random value is decreased to a specific value, transmitting data through the permission-free channel. For example, the size of the contention window of the peripheral nodes of the permission-free channel or the size of a contention window can be obtained based on the state of the permission-free channel, the type of the service to be transmitted through the permission-free channel, the number of peripheral nodes of the permission-free channel, or any combination thereof.

Description

Based on adjustable contention window at the method and apparatus of exempting from grant channel transmitting data

Technical field

The present invention relates to wireless communication system, particularly relate to based on adjustable contention window at the method and apparatus of exempting from grant channel transmitting data.

Background technology

Along with the growth of business demand, the operator of cellular network needs more frequency band except licensed band.The LTE exempted from licensed band disposes (being hereinafter called for short " LTE-U "), usually more than 5GHz, can realize unloading a large number of services from license carrier wave.

Different from special licensed band, the frequency band of exempting to permit is by multiple RAT (wireless access technology), and such as LTE-U, Wi-Fi and radar system share.Therefore, the coexistence problems between Different L TE-U operator and between multiple RAT needs to be resolved at the beginning of the design of LTE-U.Owing to lacking joint network plan, different operators may regional deployment LTE-U community overlapping geographically or even closely Alignment.For Wi-Fi node and the LTE-U community of highly dense deployment, have very large possibility they can select and share same exempt from permit carrier wave.

Before data is transmitted, first each LTE-U community needs to detect channel (also namely, ListenBeforeTalk).When the channel detected is for time idle, multiple LTE-U community may use this channel in the similar time, thus causes channel confliction.Fig. 1 and Fig. 2 shows an example of channel confliction, and wherein when detecting that channel is the free time, Liang Ge LTE-U operator is at competitive channel.If allow the uplink of exempting from grant channel, conflict will become even more serious, because the multiple subscriber equipmenies (UE) belonging to operator A and operator B also should can use this channel.In addition, coexist for LTE-U, if a LTE-U community is competed in the short period of time and occupies channel, and this channel is very busy and also used by other Wi-Fi nodes or other LTE-U communities, so this channel will occur congested, and the chance that other nodes access this channel is again less.On the contrary, if a LTE-U community more slowly busy channel, and this channel is not busy, and so, resource will be wasted.

For operator A and operator B, a kind of possible solution coordinates it use and transmit.But this possibility is not high yet, and reason is as follows:

(1) this channel exempts from grant channel, and it does not belong to any specific entity.The coordination that certain form is implemented in attempt is unpractical and also impossible success.

(2) exempt from also there is other system in grant channel at this, such as inharmonic individual or house Wi-Fi with LTE system.

Summary of the invention

Described in above, when detect exempt from grant channel idle time, use this multiple LTE-U community of exempting from grant channel or Wi-Fi node to cause channel confliction in the identical or close moment.Given this, be necessary to provide a kind of scheme coexisted for intra-RAT and inter-RAT of LTE-U system.

In order to realize object of the present invention, need the concept defining contention window, it is only applicable to unlicensed band.The size CW of contention window can based on the channel status of exempting from grant channel, by in the type of service exempting from grant channel is transmitted, use and exempt from the periphery intra-RAT of grant channel and the number of inter-RAT node, the contention window size of all mid-side nodes or its combination etc. are dynamically determined.Detailed description about contention window will provide hereinafter.

Based on the contention window of definition, according to an aspect of the present invention, providing a kind of method for communicating in the node of communication system, said method comprising the steps of: when described node has data to need when exempting from grant channel is transmitted, obtaining the size CW of competition window; Wait for predetermined amount of time T 0, and a random value is selected from scope [0, CW]; As described predetermined amount of time T 0after arrival, if described in exempt from grant channel and be in idle condition, then each time slot is successively decreased described random value; If described in exempt from grant channel and be in busy condition, then stop successively decreasing until described in exempt from grant channel and again enter idle condition, and wait for described predetermined amount of time T 0, as described predetermined amount of time T 0after arrival, continue the described random value that successively decreases; When described random value decrements to particular value, grant channel is transmitted described data described exempting from.

In one example in which, the size of contention window is determined by node itself.In this case, described obtaining step comprises: based on the first predetermined condition, determines the size CW of described competition window.

As mentioned above, described first predetermined condition comprises following any one or appoints multinomial combination:

-described in exempt from the channel status of grant channel;

-will in the described type of service exempting from that grant channel is transmitted;

The number of all mid-side nodes of grant channel is exempted from described in-use;

The contention window size of all mid-side nodes of grant channel is exempted from described in-use.

In another example, node self size of uncertain contention window, but from the size of another reception at Node contention window.In this case, described obtaining step comprises: from the size CW of competition window described in another reception at Node.

In one example in which, determine that exempting from grant channel is idle condition or busy condition by node oneself.In this case, described method also comprises: when the second predetermined condition is satisfied, and exempts from grant channel and be in idle condition described in determining.Such as, described second predetermined condition is satisfied and can comprises: channel measurement is less than the first numerical value; Or energy detection results is less than second value.

In another example, determine that exempting from grant channel is idle condition or busy condition by subscriber equipment, then send free/busy indication information to node.In this case, described method also comprises: receive the free/busy indication information from subscriber equipment, exempts from grant channel and be in idle condition or busy condition described in described free/busy indication information is used to indicate; If exempting from grant channel described in the instruction of free/busy indication information is be in idle condition, then exempts from grant channel described in determining and be in idle condition; If exempting from grant channel described in the instruction of free/busy indication information is be in busy condition, then exempts from grant channel described in determining and be in busy condition.

According to another aspect of the present invention, provide a kind of in the subscriber equipment of communication system for sending the method for indication information, said method comprising the steps of: based on the 3rd predetermined condition, send free/busy indication information to node, described free/busy indication information is used to indicate exempts from grant channel and is in idle condition or busy condition.

Described forwarding step can comprise: determine whether described 3rd predetermined condition is satisfied; If described 3rd predetermined condition is satisfied, sends described in being used to indicate and exempt from the free/busy indication information extremely described node that grant channel is in idle condition; If described 3rd predetermined condition is not satisfied, sends described in being used to indicate and exempt from the free/busy indication information extremely described node that grant channel is in busy condition.Such as, described 3rd predetermined condition is satisfied and can comprises: when reference signal time slot is measured, Reference Signal Received Power is greater than third value; Or when non-reference signal time slot is measured, energy detection results is less than the 4th numerical value.

According to a further aspect of the invention, provide a kind of device for communicating in the node of communication system, described device comprises: acquiring unit, for there being data to need when exempting from grant channel is transmitted when described node, obtains the size CW of competition window; Delay cell, for waiting for predetermined amount of time T 0; Selected cell, for selecting a random value from scope [0, CW]; Subtrator, for working as described predetermined amount of time T 0after arrival, if described in exempt from grant channel and be in idle condition, then each time slot is successively decreased described random value; If described in exempt from grant channel and be in busy condition, then stop successively decreasing until described in exempt from grant channel and again enter idle condition, and wait for described predetermined amount of time T 0, as described predetermined amount of time T 0after arrival, continue the described random value that successively decreases; Transmission unit, for when described random value decrements to particular value, grant channel is transmitted described data described exempting from.

According to a further aspect of the invention, provide a kind of in the subscriber equipment of communication system for sending the device of indication information, described device comprises: transmitting element, for based on the 3rd predetermined condition, send free/busy indication information to node, described free/busy indication information is used to indicate exempts from grant channel and is in idle condition or busy condition.

Various aspects of the present invention are more clear by the explanation by specific embodiment hereinafter.

Accompanying drawing explanation

By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:

The schematic diagram that Fig. 1 shows between LTE-U and Wi-Fi and coexists between LTE-U operator;

Fig. 2 shows the schematic diagram conflicted when channel idle being detected;

Fig. 3 shows and is exempting from the method schematic diagram of grant channel transmitting data based on adjustable contention window.

In the drawings, same or similar Reference numeral represents identical or corresponding parts or feature.

Embodiment

Described in above, in the present invention, introduce adjustable contention window.

In one embodiment, the size CW of contention window dynamically can determine based on the channel status of exempting from grant channel.Usually, when the channel status detected is busy, larger contention window can be set.On the contrary, when the channel status detected is for time idle, less contention window can be set.Average channel is busy/sense cycle ratio (averagedchannelbusy/sensingperiodratio) as an instruction of channel status, can be used for determining competition window.Table I shows the size of the competition window based on channel status.

Table I

As can be seen from Table I, when ratio is 20%, the size of competition window is set to 3 time slots, exempts from grant channel for allowing to access rapidly.When ratio is more than 60%, the size of competition window is set to 15 time slots, exempts from grant channel for delaying access.

In another example, the size CW of contention window can based on dynamically will determining in the type of service exempting from grant channel is transmitted.Usually, such as, for the business of high priority, latency sensitive services, less contention window can be set, and for the best service (besteffortservice), larger contention window can be set.Table II shows the size of the competition window based on type of service.

Table II

As can be seen from Table II, for speech business, the size of contention window is 3 time slots, but for the best service, the size of contention window is 15 time slots.This brings scheduling efficiency for different QoS requirements.

In another example, the size CW of contention window dynamically can determine based on using the number of the periphery intra-RAT and inter-RAT node (such as, LTE-U community and Wi-Fi access point) that exempt from grant channel.Based on the cell ID (ID) of the LTE-U community detected and/or the service set (SSID) of Wi-Fi node, when there is a large amount of all mid-side nodes, can the size of contention window be set to larger.Otherwise, can the size of contention window be set to less.

Be understandable that, in actual applications, exempt from the channel status of grant channel, in the type of service exempting from grant channel is transmitted, the periphery intra-RAT of grant channel and the number of inter-RAT node will be exempted from and use any combination of exempting from the contention window size of all mid-side nodes of grant channel can be used for determining the size CW of contention window.

Such as, can simultaneously based on exempting from the channel status of grant channel and dynamically will determining the size CW of competition window in the type of service exempting from grant channel is transmitted, as shown in Table III.

TableIII

It should be noted that, in each embodiment of the application, time slot can comprise one or more Transmission Time Interval (TTI).

Based on the detailed description above about contention window, the method for various embodiments of the present invention will describe in detail hereinafter.

With reference to Fig. 3, in step 301, described node has data to need when exempting from grant channel is transmitted, and obtains the size CW of competition window.This node can be such as LTE-U community.

In one example in which, determined the size CW of competition window based on the first predetermined condition by node oneself.This first predetermined condition can comprise the channel status of exempting from grant channel such as above mentioned, will in the type of service exempting from grant channel is transmitted, exempt from the periphery intra-RAT of grant channel and the number of inter-RAT node, use the contention window size exempting from all mid-side nodes of grant channel, or its any combination.Be understandable that, other suitable predetermined conditions also can be used for determining the size of contention window of the present invention.

In another example, this node oneself size of uncertain contention window, but from the size CW of other reception at Node contention window.In this case, can by interface transmission such as such as S1, X2 for the signaling of the size of interactive competition window between two different operators.

Be understandable that, if determine the size of contention window by node self, so the size CW of determined contention window can be sent to shared this and exempt from other nodes of grant channel by this node.

Then, in step 302, node waits for predetermined amount of time T 0.This time period T 0for meeting zonal adjustment demand (such as, LBT) and turning off-open transition.

Then, in step 303, node selects a random value from scope [0, CW].

Be understandable that, node can at stand-by period section T 0during in select this random value, or also can at predetermined amount of time T 0this random value is selected again after arrival.

As predetermined amount of time T 0after arrival, in step 304, if exempt from grant channel to be in idle condition, then node to successively decrease this random value for each time slot.Otherwise if exempt from grant channel to be in busy condition, then node stops successively decreasing until this exempts from grant channel again enter idle condition, and then waits for predetermined amount of time T 0, as predetermined amount of time T 0after arrival, continue this random value that successively decreases.

In one example in which, can determine that exempting from grant channel is in idle condition or busy condition by node oneself.When the second predetermined condition is satisfied, node determines that exempting from grant channel is in idle condition.Such as, node can carry out channel measurement, and when channel measurement is less than the first numerical value, node determines that this is exempted from grant channel and is in idle condition.Again such as, node can carry out energy measuring, and when energy detection results is less than second value, node determines that this is exempted from grant channel and is in idle condition.

Node also can indicate (CQI) to determine based on the channel quality from subscriber equipment that to exempt from grant channel be idle condition or busy condition.If the CQI of subscriber equipment report is greater than predetermined minimum performance MCS, so node determines that exempting from grant channel is in idle condition.In addition, even if having the interference reported from Wi-Fi or other LTE-U but from the angle transmission cycle of network system performance still in acceptable threshold range, so also can determine that exempting from grant channel is in idle condition.

In another example, also can determine that exempting from grant channel is in idle condition or busy condition by subscriber equipment.Such as, subscriber equipment can send free/busy indication information to node, is used to indicate to exempt from grant channel and be in idle condition or busy condition.Such as, when reference signal time slot is measured, subscriber equipment can measuring reference signals received power (RSRP), if RSRP is greater than third value, then subscriber equipment sends to be used to indicate and exempts from grant channel and be in the free/busy indication information of idle condition to node.Otherwise if RSRP is not less than third value, then subscriber equipment sends to be used to indicate and exempts from grant channel and be in the free/busy indication information of busy condition to node.Again such as, when non-reference signal time slot is measured, subscriber equipment can carry out energy measuring, if energy detection results is less than the 4th numerical value, then subscriber equipment sends to be used to indicate and exempts from grant channel and be in the free/busy indication information of idle condition to node.Otherwise if energy detection results is not more than the 4th numerical value, then subscriber equipment sends to be used to indicate and exempts from grant channel and be in the free/busy indication information of busy condition to node.After receiving the free/busy indication information from subscriber equipment, node can know the channel status of exempting from grant channel.

Then, in step 305, when random value decrements to particular value, such as 0 time, node exempts from grant channel transmitting data at this.

Be understandable that, in various embodiments, the size CW of contention window depends on the RAT of most strong jamming person.This means that Wi-Fi and LTE-U runs on different time-quantum methods, wherein with Microsecond grade measurement, LTE-U time slot is Millisecond to Wi-Fi time slot.Therefore, if intruder is Wi-Fi, then the size CW of contention window can be less, if intruder is LTE-U, then can use larger contention window.

In one or more exemplary design, the function that can realize described in the application by hardware, software, firmware or their combination in any.If realized with software, then can using described function as one or more instruction or code storage on a computer-readable medium, or transmit as the one or more instruction on computer-readable medium or code.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises and contributes to computer program is delivered to another place arbitrary medium from a place.Storage medium can be the addressable any usable medium of universal or special computer.This computer-readable medium can comprise, such as but not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage device or other magnetic storage apparatus, or can be used for other medium any carrying or store the code modules of hope with the form of universal or special computer or the addressable instruction of universal or special processor or data structure.Further, any connection also can be known as computer-readable medium.Such as, if software be use coaxial cable, optical fiber cable, twisted-pair feeder, the wireless technology of Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave and so on is come from website, server or other remote source, so the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, radio and microwave and so on is also included within the definition of medium.

All general processors, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or the combination in any for performing function as herein described can realize or perform in conjunction with various exemplary logical block, module and the circuit described by the disclosure.General processor can be microprocessor, or processor also can be the processor of any routine, controller, microcontroller or state machine.Processor also can be implemented as the combination of computing equipment, such as, and the combination of the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessor and DSP kernel, or other this kind of structure any.

Those of ordinary skill in the art it is also understood that various exemplary logical block, module, circuit and algorithm steps that the embodiment in conjunction with the application describes can be embodied as electronic hardware, computer software or the combination of the two.In order to clearly represent this interchangeability between hardware and software, all around its function, general description is carried out to various exemplary parts, block, module, circuit and step above.Be embodied as hardware as this function or be embodied as software, the design constraint depending on specific application and apply over the whole system.Those skilled in the art for often kind of application-specific, can realize described function in the mode of accommodation, but, thisly realize decision-making and should not be construed as and deviate from protection scope of the present invention.

Above description of the present disclosure is for enabling any those of ordinary skill of this area realize or use the present invention.To those skilled in the art, various amendment of the present disclosure is all apparent, and general principle defined herein also can be applied to other distortion when not departing from spirit of the present invention and protection range.Therefore, the present invention is not limited to example as herein described and design, but consistent with the widest scope of principle disclosed herein and novel features.

Claims (14)

1. the method for communicating in the node of communication system, said method comprising the steps of:
-when described node has data to need when exempting from grant channel is transmitted, obtain the size CW of competition window;
-wait for predetermined amount of time T 0, and a random value is selected from scope [0, CW];
-as described predetermined amount of time T 0after arrival, if described in exempt from grant channel and be in idle condition, then each time slot is successively decreased described random value; If described in exempt from grant channel and be in busy condition, then stop successively decreasing until described in exempt from grant channel and again enter idle condition, and wait for described predetermined amount of time T 0, as described predetermined amount of time T 0after arrival, continue the described random value that successively decreases;
-when described random value decrements to particular value, grant channel is transmitted described data described exempting from.
2. method according to claim 1, is characterized in that, described obtaining step comprises:
-based on the first predetermined condition, determine the size CW of described competition window.
3. method according to claim 2, is characterized in that, described first predetermined condition comprises following any one or appoints multinomial combination:
-described in exempt from the channel status of grant channel;
-will in the described type of service exempting from that grant channel is transmitted;
The number of all mid-side nodes of grant channel is exempted from described in-use;
The contention window size of all mid-side nodes of grant channel is exempted from described in-use.
4. according to the method in claim 2 or 3, it is characterized in that, described method is further comprising the steps of:
-send the size CW of determined described competition window to other nodes.
5. method according to claim 1, is characterized in that, described obtaining step comprises:
-from the size CW of competition window described in another reception at Node.
6. method according to claim 1, is characterized in that, described method also comprises:
-when the second predetermined condition is satisfied, exempt from grant channel described in determining and be in idle condition.
7. method according to claim 6, is characterized in that, described second predetermined condition is satisfied and comprises following any one:
-channel measurement is less than the first numerical value;
-energy detection results is less than second value.
8. method according to claim 1, is characterized in that, described method also comprises:
-receive free/busy indication information from subscriber equipment, exempt from grant channel described in described free/busy indication information is used to indicate and be in idle condition or busy condition;
If exempting from grant channel described in the instruction of-free/busy indication information is be in idle condition, then exempts from grant channel described in determining and be in idle condition;
If exempting from grant channel described in the instruction of-free/busy indication information is be in busy condition, then exempts from grant channel described in determining and be in busy condition.
9. method according to claim 1, is characterized in that, described particular value is 0.
10. in the subscriber equipment of communication system for sending a method for indication information, said method comprising the steps of:
-based on the 3rd predetermined condition, send free/busy indication information to node, described free/busy indication information is used to indicate exempts from grant channel and is in idle condition or busy condition.
11. methods according to claim 10, wherein said forwarding step comprises:
-determine whether described 3rd predetermined condition is satisfied;
If-described 3rd predetermined condition is satisfied, sends described in being used to indicate and exempt from the free/busy indication information extremely described node that grant channel is in idle condition;
If-described 3rd predetermined condition is not satisfied, sends described in being used to indicate and exempt from the free/busy indication information extremely described node that grant channel is in busy condition.
12. methods according to claim 11, wherein said 3rd predetermined condition is satisfied and comprises following any one:
-when reference signal time slot is measured, Reference Signal Received Power is greater than third value;
-when non-reference signal time slot is measured, energy detection results is less than the 4th numerical value.
13. 1 kinds of devices for communicating in the node of communication system, described device comprises:
Acquiring unit, for there being data to need when exempting from grant channel is transmitted when described node, obtains the size CW of competition window;
Delay cell, for waiting for predetermined amount of time T 0;
Selected cell, for selecting a random value from scope [0, CW];
Subtrator, for working as described predetermined amount of time T 0after arrival, if described in exempt from grant channel and be in idle condition, then each time slot is successively decreased described random value; If described in exempt from grant channel and be in busy condition, then stop successively decreasing until described in exempt from grant channel and again enter idle condition, and wait for described predetermined amount of time T 0, as described predetermined amount of time T 0after arrival, continue the described random value that successively decreases;
Transmission unit, for when described random value decrements to particular value, grant channel is transmitted described data described exempting from.
14. 1 kinds in the subscriber equipment of communication system for sending the device of indication information, described device comprises:
Transmitting element, for based on the 3rd predetermined condition, sends free/busy indication information to node, and described free/busy indication information is used to indicate exempts from grant channel and be in idle condition or busy condition.
CN201410429228.2A 2014-08-28 2014-08-28 Based on adjustable contention window in the method and apparatus for exempting from grant channel transmitting data CN105376862B (en)

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CN107949011A (en) * 2017-12-03 2018-04-20 石春 A kind of adaptive perception window regulation method
CN108512633A (en) * 2017-02-28 2018-09-07 华为技术有限公司 A kind of data transmission method and device
WO2019042270A1 (en) * 2017-09-01 2019-03-07 Huawei Technologies Co., Ltd. Grant-free uplink transmission in unlicensed spectrum
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CN1462523A (en) * 2001-05-11 2003-12-17 皇家菲利浦电子有限公司 Dynamic frequency selection scheme for IEEE 802.11. WLANS
US20100009692A1 (en) * 2008-07-10 2010-01-14 Samsung Electronics Co. Ltd. Method and apparatus for frame based resource sharing in cognitive radio communication system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018059188A1 (en) * 2016-09-30 2018-04-05 华为技术有限公司 Uplink transmission method and device
CN107889264A (en) * 2016-09-30 2018-04-06 华为技术有限公司 A kind of ascending transmission method and equipment
CN108512633A (en) * 2017-02-28 2018-09-07 华为技术有限公司 A kind of data transmission method and device
WO2019042270A1 (en) * 2017-09-01 2019-03-07 Huawei Technologies Co., Ltd. Grant-free uplink transmission in unlicensed spectrum
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CN107949011A (en) * 2017-12-03 2018-04-20 石春 A kind of adaptive perception window regulation method
WO2019157952A1 (en) * 2018-02-13 2019-08-22 电信科学技术研究院有限公司 Grant free transmission power control method and apparatus in multi-beam configuration

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