CN110476464B - Uplink synchronization method and device - Google Patents
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- CN110476464B CN110476464B CN201780089199.1A CN201780089199A CN110476464B CN 110476464 B CN110476464 B CN 110476464B CN 201780089199 A CN201780089199 A CN 201780089199A CN 110476464 B CN110476464 B CN 110476464B
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Abstract
The application provides an uplink synchronization method and device. The method is applied to a communication system under an LBT mechanism on an unlicensed frequency band, and comprises the following steps: the method comprises the steps that a network device determines a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of the starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device for transmitting data to the network device; the network device sends the time adjustment to the one or more terminal devices. By the scheme provided by the invention, the mutual interference of uplink transmission of the terminal equipment working under an LBT mechanism on an unlicensed frequency band can be avoided.
Description
Technical Field
The present application relates to the field of wireless communications, and in particular, to an uplink synchronization method and apparatus.
Background
The spectrum is a basis of wireless communication, and according to the newly released international spectrum white paper of the Federal Communications Commission (FCC), resources of an unlicensed frequency band (also referred to as an unlicensed spectrum) are greater than resources of a Licensed frequency band (also referred to as a Licensed spectrum), so that a Long Term Evolution (LTE) terminal device is applied to the unlicensed frequency band, for example, a Licensed-Assisted Access Using Long Term Evolution (LAA-LTE) system, which can not only effectively utilize the unlicensed frequency band, but also provide more effective wireless Access to meet the increasing demand of mobile broadband services.
Listen Before Talk (Listen Before Talk, LBT) is an intersystem coexistence policy. LBT is characterized by: before each terminal device sends a signal on a certain Channel, it needs to go through a Clear Channel Assessment (CCA) process to detect whether the current Channel is idle, if so, the terminal device may send the signal, and if not, the terminal device cannot send the signal currently, so that, based on the LBT rule, data transmission of the terminal device in the unlicensed frequency band is opportunistic.
In the coverage area of the cell configured by the network device, there is transmission delay in communication between the terminal device and the network device at different distances from the network device, and the LTE system adjusts the Timing Advance (TA) for the terminal device to meet the requirement that the uplink data transmission of the terminal device at different distances can be aligned when reaching the network device side, that is, the network device controls the time when the uplink data of the terminal device at different distances from the network device reaches the network device by controlling the TA of each terminal device, so as to align the uplink subframe receiving Timing at the network device side, as shown in fig. 1.
However, under the LBT mechanism, uplink transmission requires the terminal device to perform uplink LBT first, and the terminal device is allowed to perform uplink data transmission only when the channel occupancy condition is satisfied. Based on the current TA mode, if different near and far terminal devices all want to transmit in the same uplink subframe, the far terminal device starts CCA in advance, and then starts transmission, and when the near terminal device starts uplink CCA detection, the near terminal device considers that the channel is not idle and cannot perform uplink transmission due to the use of the channel by the far terminal device, as shown in fig. 2.
Therefore, intensive research needs to be carried out on carriers in an unlicensed frequency band, and due to different distances between terminal devices and network devices, when different near-far terminal devices which need to transmit data on the same uplink subframe perform CCA detection, mutual interference between the terminal devices causes uplink unavailability of some terminal devices.
Disclosure of Invention
The application describes an uplink synchronization method and device, which can avoid mutual interference of uplink transmission of terminal equipment working under an LBT mechanism on an unlicensed frequency band.
In a first aspect, an embodiment of the present application provides an uplink synchronization method, where the method is applied in a communication system operating under an LBT mechanism on an unlicensed frequency band, and includes: the method comprises the steps that a network device determines a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of the starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device for transmitting data to the network device; the network device sends the time adjustment to the one or more terminal devices.
In a possible implementation manner of the first aspect, the determining, by the network device, a time adjustment amount includes: the network device determines the time adjustment amount so that the starting time of the uplink subframe is the time when the network device starts the normal reception of the uplink subframe.
In a possible implementation manner of the first aspect, the determining, by the network device, a time adjustment amount includes: the network device determines the time adjustment amount so that the starting time of the uplink subframe is earlier than the time of starting the conventional reception of the uplink subframe by a first time, wherein the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
In a possible implementation manner of the first aspect, the determining, by the network device, a time adjustment amount includes: the network device determines the time adjustment amount so that the starting time of the uplink subframe is a first time, the first time is a time between a second time and the time when the network device starts the regular reception of the uplink subframe, the second time is earlier than the time when the network device starts the regular reception of the uplink subframe by a first time, and the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
In a second aspect, an embodiment of the present application provides a network device, which executes the method in the first aspect or any one of the possible implementation manners of the first aspect. In particular, the network device comprises means for performing the first aspect or the method in any one of its possible implementations.
In a third aspect, an embodiment of the present application provides a network device, where the network device includes: a receiver, a transmitter, a processor, and a memory. The receiver, the transmitter, the processor and the memory may be connected by a bus system. The memory is configured to store a program, an instruction, or a code, and the processor is configured to execute the program, the instruction, or the code in the memory to perform the method in the first aspect or any possible implementation manner of the first aspect.
In a fourth aspect, an embodiment of the present application provides a communication system, where the communication system includes a terminal device and the network device in the second aspect or the third aspect.
In a fifth aspect, the present application provides a computer-readable storage medium for storing a computer program, where the computer program is configured to execute the instructions of the method in the first aspect and any possible implementation manner of the first aspect.
Drawings
Fig. 1 is a diagram of uplink transmission of a terminal device in the prior art;
fig. 2 is a diagram illustrating uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed frequency band in the prior art;
FIG. 3 is a diagram of a network architecture to which embodiments of the present application are applied;
fig. 4 is a flowchart of an embodiment of an uplink synchronization method provided in the present application;
fig. 5 is a schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed frequency band in an embodiment of the present application;
fig. 6 is another schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed frequency band in an embodiment of the present application;
fig. 7 is a further schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed frequency band in the embodiment of the present application;
FIG. 8 is a block diagram of one embodiment of a network device provided herein;
fig. 9 is a block diagram of another embodiment of a network device provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 shows a communication system 100 to which an embodiment of the present application is applied. Communication system 100 may include at least one network device 110 and a plurality of terminal devices 120 located within the coverage area of network device 110. Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.
Optionally, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto.
The communication System applied in the embodiment of the present application may be a Global System for Mobile communication (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a 5G New Radio (NR) System, and other wireless communication systems applying Orthogonal Frequency Division Multiplexing (OFDM) technology.
The network device related in the embodiment of the application can be used for providing a wireless communication function for the terminal device. The network devices may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. The network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB or e-NodeB) in LTE, and a corresponding device gNB in a 5G network. For convenience of description, in all embodiments of the present application, the above-mentioned apparatus for providing a wireless communication function for a terminal device is collectively referred to as a network device.
The Terminal device related in the embodiment of the present application may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, where the Terminal device may communicate with one or more core networks through a Radio Access Network (RAN), for example, the Terminal device may be a Mobile phone (or a "cellular" phone), a computer with a Mobile Terminal, and the like, and for example, the Terminal device may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile device, and they exchange languages and/or data with the RAN. The embodiments of the present application are not particularly limited.
The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
The embodiments of the present invention will be described in further detail below based on the common aspects of the present invention described above.
Fig. 4 is a flowchart illustrating an uplink synchronization method according to an embodiment of the present invention.
S210: the network equipment determines a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of the starting time of an uplink subframe occupied by one or more terminal equipment in a cell corresponding to the network equipment for transmitting data to the network equipment.
As an example, the time adjustment amount may be a time value, that is, the time adjustment amount may be an adjustment value itself of the starting time of the uplink subframe. As another example, the time adjustment value may be an index number, in which case, the network device and the one or more terminal devices store the same time adjustment amount index table in which adjustment values at the start time of the uplink subframe are in one-to-one correspondence with the index number.
Here, the adjustment value of the starting time of the uplink subframe refers to a difference between the adjusted starting time of the uplink subframe and the original starting time of the uplink subframe.
Here, the one or more terminal devices may be all terminal devices in a cell corresponding to the network device, or may be some of the terminal devices, which is not limited in this application. As an example, the one or more terminal devices may be terminal devices operating under an LBT mechanism on an unlicensed frequency band within a cell corresponding to the network device. As another example, the one or more terminal devices may be terminal devices operating under an LBT mechanism on the same unlicensed frequency band within a cell corresponding to the network device.
S220: the network device sends the time adjustment to the one or more terminal devices.
Here, the network device may send the time adjustment amount to the one or more terminal devices in a manner of sending a TA in the prior art, or may use other manners, which is not limited in this application.
S230: and the one or more terminal devices determine the starting moment of the uplink subframe according to the time adjustment amount.
As an example, in the case that the time adjustment value is an index number, the one or more terminal devices may perform a lookup in the time adjustment amount index table stored therein according to the index number to determine an adjustment value of the starting time of the uplink subframe.
For example, assume that the original starting times of n uplink subframes occupied by terminal device 1 for sending data to the network device are t1、t2、t3、......、tnIf the adjusted value of the starting time of the uplink sub-frame is Δ t, the adjusted starting time of the n uplink sub-frames is divided intoIs otherwise (t)1+Δt)、(t2+Δt)、(t3+Δt)、......、(tn+Δt)。
S240: and after the CCA succeeds, the one or more terminal devices send data to the network device according to the starting time of the uplink subframe.
Here, there may be an interval between the CCA procedure and the uplink data transmission procedure, or may not be an interval, which is not limited in this application.
In this embodiment, since the network device determines a time adjustment amount and transmits the time adjustment amount to the one or more terminal devices, therefore, the terminal devices adjust the starting time of the uplink sub-frame occupied by the terminal devices for transmitting data to the network device according to the same time adjustment amount, so that the starting time of the uplink sub-frame is the same with each other, and because the CCA detection is completed before the data is sent, the starting moments of the uplink subframes occupied by the terminal devices for sending the data to the network device are ensured to be the same, so that each terminal device in the terminal devices can not mistakenly assume that the channel is not idle because other terminal devices needing to send the data on the same uplink subframe start sending in advance when the CCA detection is carried out, the success probability of the uplink CCA of the terminal devices is effectively improved, and the uplink multi-user capacity is increased.
Optionally, at S210, the network device determines the time adjustment amount so that the starting time of the uplink subframe is the time when the network device starts normal reception of the uplink subframe.
That is, the network device determines the time adjustment amount so that the starting time of the uplink subframe is aligned with the time when the network device starts the regular reception of the uplink subframe, as shown in fig. 5, although distances between the near-end terminal device 1 and the far-end terminal device 2 and the network device are different from each other, the starting times of the uplink subframes occupied by the network device to transmit data to the network device are the same as each other.
In this case, as shown in fig. 5, due to transmission delay, for both the near-end terminal device 1 and the far-end terminal device 2, the time when the uplink subframe occupied by sending data to the network device actually reaches the network device is later than the time when the network device starts the conventional reception of the uplink subframe, so to ensure the integrity of data reception, as an example, the terminal device leaves a symbol at the tail part of the uplink subframe as a blank and does not carry data, for example, the terminal device may leave the last symbol of the uplink subframe as a blank.
Optionally, at S210, the network device determines the time adjustment amount such that the starting time of the uplink subframe is earlier than the time when the network device starts the regular reception of the uplink subframe by a first time, where the first time is determined according to a distance between the farthest coverage point of the cell corresponding to the network device and the network device.
As an example, the first time is a transmission delay between a terminal device located at a farthest coverage point of a cell corresponding to the network device and the network device. In this case, as shown in fig. 6, assuming that the far-end terminal device 2 is located at the farthest coverage point of the cell corresponding to the network device, the time when the uplink subframe occupied by sending data to the network device reaches the network device is aligned with the time when the network device starts the regular reception of the uplink subframe, and for a terminal device (for example, the near-end terminal device 1) that is not located at the farthest coverage point of the cell corresponding to the network device, the time when the uplink subframe occupied by sending data to the network device reaches the network device is earlier than the time when the network device starts the regular reception of the uplink subframe, so as to exemplify, the terminal device does not need to leave the tail part symbol of the uplink subframe as blank.
Optionally, at S210, the network device determines the time adjustment amount such that a starting time of the uplink subframe is a first time, the first time is a time between a second time and a time when the network device starts normal reception of the uplink subframe, the second time is earlier than the time when the network device starts normal reception of the uplink subframe by a first time, and the first time is determined according to a distance between a farthest coverage point of a cell corresponding to the network device and the network device.
As an example, the first time is a transmission delay between a terminal device located at a farthest coverage point of a cell corresponding to the network device and the network device. In this case, as shown in fig. 7, assuming that the transmission delay between the near-end terminal device 1 and the network device is less than the first time, and the transmission delay between the far-end terminal device 2 and the network device is greater than the first time, the time when the uplink subframe occupied by the transmission of data from the near-end terminal device 1 to the network device reaches the network device is earlier than the time when the network device starts the conventional reception of the uplink subframe, and the time when the uplink subframe occupied by the transmission of data from the far-end terminal device 2 to the network device reaches the network device is later than the time when the network device starts the conventional reception of the uplink subframe, that is, in the one or more terminal devices, there may be a terminal device which arrives at the network device later than the time when the uplink subframe occupied by the transmission of data to the network device reaches the network device (once this terminal device and air interface device have been used, this terminal device and air interface device are used as a The transmission delay between the network devices is greater than the first time), so to ensure the integrity of data reception, for example, the terminal device leaves a tail part symbol of the uplink subframe as a blank and does not carry data, for example, the terminal device may leave a last symbol of the uplink subframe as a blank.
As an example, the network device may determine the first time according to a distance distribution of the one or more terminal devices. For example, in the case where a majority of the one or more terminal devices are closer to the network device, the network device may determine a smaller first time; in the case where a majority of the one or more terminal devices are located further from the network device, the network device may determine a larger first time.
Referring to fig. 8, an embodiment of a network device provided in the present application includes a sending unit 310 and a processing unit 320.
The processing unit 320 is configured to: determining a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of a starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device for transmitting data to the network device.
The sending unit 310 is configured to: transmitting the time adjustment to the one or more terminal devices.
Optionally, the processing unit 320 is further configured to: determining the time adjustment amount to enable the starting time of the uplink subframe to be the time when the network equipment starts the normal reception of the uplink subframe.
Optionally, the processing unit 320 is further configured to: determining the time adjustment amount to make the starting time of the uplink subframe earlier than the time of starting the conventional reception of the uplink subframe by a first time, wherein the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network equipment and the network equipment.
Optionally, the processing unit 320 is further configured to: determining the time adjustment amount so that the starting time of the uplink subframe is a first time, the first time is a time between a second time and the time when the network device starts the regular reception of the uplink subframe, the second time is earlier than the time when the network device starts the regular reception of the uplink subframe by a first time, and the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
For a detailed description of technical details and advantageous effects in the present embodiment, reference should be made to the above-described method embodiments.
Referring to fig. 9, another embodiment of a network device provided herein includes a transmitter 410 and a processor 420.
The processor 420 is configured to: determining a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of a starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device for transmitting data to the network device.
The transmitter 410 is configured to: transmitting the time adjustment to the one or more terminal devices.
Optionally, the processor 420 is further configured to: determining the time adjustment amount to enable the starting time of the uplink subframe to be the time when the network equipment starts the normal reception of the uplink subframe.
Optionally, the processor 420 is further configured to: determining the time adjustment amount to make the starting time of the uplink subframe earlier than the time of starting the conventional reception of the uplink subframe by a first time, wherein the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network equipment and the network equipment.
Optionally, the processor 420 is further configured to: determining the time adjustment amount so that the starting time of the uplink subframe is a first time, the first time is a time between a second time and the time when the network device starts the regular reception of the uplink subframe, the second time is earlier than the time when the network device starts the regular reception of the uplink subframe by a first time, and the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
For a detailed description of technical details and advantageous effects in the present embodiment, reference should be made to the above-described method embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An uplink synchronization method, applied to a communication system under an LBT mechanism on an unlicensed frequency band, includes:
the method comprises the steps that a network device determines a time adjustment quantity, wherein the time adjustment quantity indicates an adjustment value of the starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device for sending data to the network device, the time adjustment quantity is an index number, the network device and the one or more terminal devices store the same time adjustment quantity index table, in the time adjustment quantity index table, the adjustment value of the starting time of the uplink subframe corresponds to the index number one by one, and the adjustment value of the starting time of the uplink subframe refers to a difference value between the adjusted starting time of the uplink subframe and the original starting time of the uplink subframe;
and the network equipment sends the time adjustment quantity to the one or more terminal equipments, so that the one or more terminal equipments look up an adjustment value of the starting time of the uplink subframe in the time adjustment quantity index table according to the time adjustment quantity to determine the starting time of the uplink subframe, and send data to the network equipment according to the starting time of the uplink subframe after the CCA is successfully evaluated on the idle channel.
2. The method of claim 1, wherein the network device determining a time adjustment comprises:
the network device determines the time adjustment amount so that the starting time of the uplink subframe is the time when the network device starts the normal reception of the uplink subframe.
3. The method of claim 1, wherein the network device determining a time adjustment comprises:
the network device determines the time adjustment amount so that the starting time of the uplink subframe is earlier than the time when the network device starts the conventional reception of the uplink subframe by a first time, wherein the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
4. The method of claim 1, wherein the network device determining a time adjustment comprises:
the network device determines the time adjustment amount so that the starting time of the uplink subframe is a first time, the first time is a time between a second time and the time when the network device starts the regular reception of the uplink subframe, the second time is earlier than the time when the network device starts the regular reception of the uplink subframe by a first time, and the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
5. A network device operating under an LBT mechanism on an unlicensed frequency band, the network device comprising:
a determining unit, configured to determine a time adjustment amount, where the time adjustment amount indicates an adjustment value of a starting time of an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device to send data to the network device, the time adjustment amount is an index number, the network device and the one or more terminal devices store a same time adjustment amount index table, and in the time adjustment amount index table, the adjustment value of the starting time of the uplink subframe corresponds to the index number one to one, and the adjustment value of the starting time of the uplink subframe refers to a difference between the adjusted starting time of the uplink subframe and an original starting time of the uplink subframe;
a sending unit, configured to send the time adjustment amount to the one or more terminal devices, so that the one or more terminal devices search, according to the time adjustment amount, an adjustment value of a starting time of the uplink subframe in the time adjustment amount index table to determine the starting time of the uplink subframe, and send data to the network device according to the starting time of the uplink subframe after a clear channel assessment CCA is successful.
6. The network device of claim 5, wherein the determination unit is further to:
determining the time adjustment amount to enable the starting time of the uplink subframe to be the time when the network equipment starts the normal reception of the uplink subframe.
7. The network device of claim 5, wherein the determination unit is further to:
determining the time adjustment amount to enable the starting time of the uplink subframe to be earlier than the time of starting the conventional reception of the uplink subframe by a first time, wherein the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network equipment and the network equipment.
8. The network device of claim 5, wherein the determination unit is further to:
and determining the time adjustment amount so that the starting time of the uplink subframe is a first time, the first time is a time between a second time and the time when the network equipment starts the conventional reception of the uplink subframe, the second time is earlier than the time when the network equipment starts the conventional reception of the uplink subframe by a first time, and the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network equipment and the network equipment.
9. A communication system, characterized in that the communication system comprises a terminal device and a network device according to any of claims 5 to 8.
10. A computer-readable storage medium for storing a computer program, characterized in that the computer program is adapted to execute the instructions of the method according to any of claims 1 to 4.
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| PCT/CN2017/079326 WO2018176479A1 (en) | 2017-04-01 | 2017-04-01 | Uplink synchronization method and apparatus |
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| CN105992222A (en) * | 2015-01-29 | 2016-10-05 | 北京三星通信技术研究有限公司 | Channel resource competition method and device |
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| CN110476464A (en) | 2019-11-19 |
| WO2018176479A1 (en) | 2018-10-04 |
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