CN110062463B - Mobile communication system and uplink control channel sending method - Google Patents
Mobile communication system and uplink control channel sending method Download PDFInfo
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- CN110062463B CN110062463B CN201810447988.4A CN201810447988A CN110062463B CN 110062463 B CN110062463 B CN 110062463B CN 201810447988 A CN201810447988 A CN 201810447988A CN 110062463 B CN110062463 B CN 110062463B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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Abstract
The application discloses a mobile communication system and a method for sending an uplink control channel, wherein the method comprises the following steps: the information of the downlink control channel indicates that s symbols last from the kth symbol in at least one sending time slot and is used for sending the information of the uplink control channel; in a sending time slot, monitoring the idle resource as the beginning of the nth symbol; l is the number of symbols of the sending time slot, when n is more than or equal to k, if L +1-n is more than or equal to s, s symbols are continuously sent from the nth symbol for sending the uplink control channel information, otherwise, the uplink control channel information is not sent; when n < k, s symbols are continuously sent from the kth symbol for sending the uplink control channel information; when the number of the transmission time slots is multiple, the uplink control channel information in each transmission time slot is the same. The present application further provides a mobile communication system including a network device and at least one terminal device. The invention effectively improves the system performance of the 5G NR system when the system is used in an unauthorized frequency band.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method for controlling an uplink control channel and a system using the same.
Background
One important application in 5G mobile communication technology is the use of unlicensed frequency bands. Unlike licensed bands, unlicensed bands are intended to satisfy the need for coexistence of various wireless systems. Typical unlicensed band applications are Wifi, LTE-based LAA technologies, and the like. In order to enable the harmonious coexistence of multiple technologies, regulatory bodies of various countries use a forced Listen Before Talk (LBT) technique for the use of unlicensed frequency bands, i.e., data transmission is enabled only when it is sensed that the current channel is not occupied. A problem with this mechanism is that some data cannot be guaranteed to be sent at a certain location.
The new air interface design (NR) of 5G is directly applied to the unlicensed band, which makes it difficult to guarantee performance. In the unlicensed frequency band, since uplink control channel (PUCCH) information fed back to the network device by the mobile terminal cannot be guaranteed to be transmitted in time at a certain time, when the service of the unlicensed frequency band is busy, the performance of the system based on NR is greatly reduced.
Disclosure of Invention
The invention provides a mobile communication system and an uplink control channel sending method, which solve the problem of performance reduction of mobile communication in an unauthorized frequency band.
The embodiment of the application provides a method for sending an uplink control channel, which comprises the following steps:
the information of the downlink control channel indicates that s symbols last from the kth symbol in at least one sending time slot and is used for sending the information of the uplink control channel;
in the sending time slot, monitoring the idle resource as the beginning of the nth symbol;
when n is more than or equal to k: if L +1-n is more than or equal to s, continuously sending s symbols from the nth symbol for sending the uplink control channel information, otherwise, not sending;
when n < k: continuously sending s symbols from the kth symbol for sending uplink control channel information;
where n, k, s are natural numbers in the range of [1, L ], and L is the number of symbols per transmission slot.
The embodiment of the present application further provides a method for sending an uplink control channel, which includes the above steps, and the downlink control channel includes an identifier of a sending time slot number. Preferably, the identification consists of M bits, corresponding to 2MAnd a state indicating a combination scheme of the transmission slots (M is an integer of 1 or more).
Preferably, in the method of the present invention, the number of the transmission time slots is multiple, and the uplink control channel information transmitted in each transmission time slot is the same.
Preferably, in the method of the present invention, the transmission time slot is a plurality of consecutive transmission time slots.
Preferably, in the method of the present invention, the number of the transmission time slots is multiple; at least one slot interval is included between at least one pair of adjacent transmission slots.
In the uplink control channel transmitting method according to any embodiment of the present invention, further, the uplink control channel information includes a plurality of ACKs/NACKs.
Preferably, the plurality of ACK/NACKs are arranged in sequence according to a time sequence of corresponding downlink data transmission.
When the uplink control channel information includes a plurality of ACKs/NACKs, a further optimized embodiment of the method of the present application further includes the following steps:
determining the value of k according to the starting symbol position for transmitting the uplink control channel information in the previous successfully configured transmission time slot;
and determining the value of s according to the number of the continuous symbols for transmitting the uplink control channel information in the transmission time slot successfully configured in the previous time slot.
The method according to any one of the embodiments of the present application, further providing a mobile communication system, including a network device and at least one terminal device: the network equipment comprises a network data unit and a network control unit; the network data unit is used for sending downlink data; the network control unit is used for sending information of a downlink control channel and receiving information of an uplink control channel; the terminal equipment comprises a terminal data unit and a terminal control unit; the terminal data unit is used for receiving the downlink data; and the terminal control unit is used for receiving the information of the downlink control channel and sending the information of the uplink control channel.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the design core of the invention is to support the feedback of dispatching a plurality of positions by PUCCH at one time. By utilizing the method and the system, the uplink PUCCH sending efficiency of the 5G NR in the unlicensed frequency band can be improved, so that the system performance of the 5G NR system in the use of the unlicensed frequency band is effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an embodiment of an uplink control channel transmission method according to the present invention;
fig. 2 is a flowchart illustrating an embodiment of an uplink control channel transmission method using multiple transmission slots according to the present invention;
FIG. 3 is a schematic diagram of a plurality of consecutive transmit timeslots;
FIG. 4 is a diagram of discontinuous transmission timeslots;
FIG. 5 is a flowchart of an embodiment of the present invention in which the uplink control channel includes multiple ACK/NACK messages;
fig. 6 is a diagram of a mobile communication system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Currently, according to the 5G NR specification, when downlink data transmission scheduling is performed, detailed PUCCH (uplink control channel) information when ACK/NACK feedback is performed is reported to a UE. The information includes the format, starting symbol, frequency domain position, frequency hopping mode, etc. of the PUCCH transmission. For the unlicensed frequency band, the influence of LBT is that whether a specific location can perform uplink transmission cannot be confirmed during downlink scheduling. If the NR design is adopted in the licensed band, a large number of invalid indications will be brought. When the indication information is no longer valid, the corresponding downlink data ACK/NACK information can not be fed back, thereby greatly reducing the operating efficiency of the system.
When the network instructs the terminal to perform feedback in the designated time slot, the terminal cannot feed back information at the designated time point of the network because the channel is occupied by other systems. At this time, since the predetermined feedback is not obtained, the network will have to retransmit the data regardless of whether the terminal correctly receives the data, thereby causing a waste of system resources.
The system and the method can improve the reliability of PUCCH transmission by configuring a plurality of possible PUCCH transmission resources for one downlink data, thereby better matching the transmission characteristics of the unlicensed frequency band. On the base station side, in order to support this characteristic, a function of supporting reception of a plurality of possible PUCCHs needs to be supported.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an embodiment of an uplink control channel transmission method according to the present invention. The method specifically comprises the following steps:
it should be noted that, in this document, the "transmission timeslot" belongs to an uplink timeslot, and specifically refers to an uplink timeslot indicated in the information of the downlink control channel, which is used for transmitting the information of the uplink control channel.
for each slot in which PUCCH can be transmitted, a transmittable symbol is first calculated according to LBT, and it is assumed that LBT obtains a transmittable symbol from the nth symbol, n is an integer equal to or greater than 1 and less than or equal to L, and for the number of symbols of each transmission slot, L >0 is an integer, for example, L ═ 14.
It should be noted that the embodiments of the present application are applicable to different technical standards, and the transmission time slots may be, for example, subframes, transmission time intervals, time slots, short intervals and the like which conform to the standards, and different types of transmission time slots include different numbers of symbols, which is not specifically limited herein.
103, sending uplink control channel information in the sending time slot;
whether the PUCCH is transmitted in the current slot is carried out according to the following procedures:
when n is more than or equal to k: if L +1-n is more than or equal to s, continuously sending s symbols from the nth symbol for sending the uplink control channel information, otherwise, not sending;
when n < k: continuously sending s symbols from the kth symbol for sending uplink control channel information;
wherein n, k, s are natural numbers in the range of [1, L ].
It should be noted that when n ≧ k, since the initial symbol position k indicated by the downlink control information is changed to n, L +1-n ≧ s, the PUCCH transmission function can be implemented in the transmission slot, and thus the transmission slot configuration is successful. Otherwise, there is not enough resource in the transmission time slot for using the continuous s symbols, and the transmission time slot configuration is unsuccessful.
It should be further noted that when n < k, s symbols can be continuously transmitted from the kth symbol, because k and s in the downlink control information can satisfy k + s ≦ L +1, and therefore, there is enough resource for consecutive s symbols from the kth symbol to the lth symbol, and the transmission slot configuration can be successful.
Preferably, in the method of this embodiment, the number of the transmission slots is multiple, and the uplink control channel information transmitted in each transmission slot is the same. The method described in steps 102-103 can be used for each transmit slot.
Fig. 2 is a flowchart of an embodiment of an uplink control channel transmission method using multiple transmission slots according to the present invention. The embodiment of the present application further provides a method for sending an uplink control channel, which includes the above steps, and the downlink control channel includes an identifier of a sending time slot number. Specifically, the method comprises the following steps:
step 201, the information indication of the downlink control channel lasts for s symbols from the kth symbol in a plurality of sending time slots, and is used for sending the information of the uplink control channel; the downlink control channel comprises an identifier of the number of sending time slots;
preferably, the identification consists of M bits, corresponding to 2MEach state represents a combination scheme (M is an integer of 1 or more) of the transmission slots, that is, each state represents one combination scheme.
Preferably, in the method of the present invention, the transmission time slot is a plurality of consecutive transmission time slots.
Preferably, in the method of the present invention, the number of the transmission time slots is multiple; at least one slot interval is included between at least one pair of adjacent transmission slots.
In addition, the combination system has 2MOne of the combinations, for example, may be any one of the following: 2 consecutive time slots, 3 consecutive time slots, … … consecutive N time slots; or 2 time slots, 3 time slots, … … and N time slots with set intervals; any other custom transmission slot permutation and combination mode can be adopted.
when n is more than or equal to k: if L +1-n is more than or equal to s, continuously sending s symbols from the nth symbol for sending the uplink control channel information, otherwise, not sending;
when n < k: continuously sending s symbols from the kth symbol for sending uplink control channel information;
wherein n, k, s are natural numbers in the range of [1, L ].
Since the number of the transmission time slots is plural, the uplink control channel information transmitted in each transmission time slot is the same. And repeating the steps 202-203 in each transmission time slot.
The PUCCH transmission persistent window information is added into the PUCCH control information transmitted by the network equipment to the terminal equipment. The information consists of M bits, M being a positive integer greater than or equal to 1. Indicating that the PUCCH can be transmitted in the transmission slot indicated by M bits. M bits characterisation 2MOne possible PUCCH may transmit slot combination. The selectable transmission slot combination mode may be a plurality of continuous slots or a plurality of discontinuous slots. The present invention is not limited to a certain combination of transmission slots, and only the case of one continuous multiple transmission slots and one discontinuous multiple transmission slots will be described below as an example.
Fig. 3 is a schematic diagram of a plurality of consecutive transmission slots. The allocated consecutive slots, that is, the mobile terminal may transmit the PUCCH in consecutive K slots, where K is a positive integer greater than or equal to 1. The terminal repeatedly transmits the PUCCH in K consecutive slots. K may be a plurality of values, and each value of K may correspond to a PUCCH transmission slot combination. For example, in fig. 3, K is 3, and uplink slots N to N +2 may be used for feedback to downlink slot 1, where uplink slot N, uplink slot N +1, and uplink slot N +2 constitute a continuous transmission slot combination scheme.
Fig. 4 is a diagram of discontinuous multiple transmission timeslots. The assigned non-contiguous slots, that is, the slot spacing between the S possible transmit slots and the S slots, S being a positive integer greater than or equal to 1. Each S value and the interval between S transmission slots correspond to a PUCCH transmission slot combination. As a typical example of S positions equally spaced, as shown in fig. 4, uplink timeslots N, N +2 and N +4 may be used for feedback of downlink timeslot 1, where uplink timeslot N, uplink timeslot N +2 and uplink timeslot N +4 constitute a discontinuous transmission timeslot combination scheme with equal spacing, and is characterized in that S is 3 and the spacing is 1.
FIG. 5 is a flowchart illustrating an embodiment of the present invention in which an uplink control channel includes multiple ACK/NACK messages. In the uplink control channel transmitting method according to any embodiment of the present invention, further, the uplink control channel information includes a plurality of ACKs/NACKs. Specifically, the method comprises the following steps:
preferably, the downlink control channel includes an identifier of the number of transmission time slots;
in step 301, the format of the PUCCH to be transmitted in the current transmission slot is determined. For example, the PUCCH format of the one transmission slot closest to the current transmission slot may be selected as the PUCCH format required for the current slot. Determining the value of k according to the starting symbol position for transmitting the uplink control channel information in the transmission time slot successfully configured in the previous time slot; determining the value of s according to the number of the continuous symbols for transmitting the uplink control channel information in the previous successfully configured transmission time slot; the successfully configured sending time slot is an uplink time slot which is indicated by the information of the downlink control channel and is specially used for sending the information of the uplink control channel, and the information of the uplink control channel is actually transmitted, namely n is more than or equal to k and L +1-n is more than or equal to s in steps 103 and 203; or n < k.
step 303 is to transmit uplink control channel information in each of the transmission slots (same as steps 103 and 203).
Preferably, when the uplink control channel information is transmitted, the plurality of ACKs/NACKs in the s symbols are sequentially arranged according to a time sequence of corresponding downlink data transmission.
That is, when one slot configures multiple possible feedbacks of the same terminal, the content of PUCCH feedback is transmitted in a bundled manner. And serially connecting the ACK/NACK feedback information required to be sent in the current time slot according to the time sequence of the downlink data sending information corresponding to the ACK/NACK, namely, the earlier the sent downlink data is, the earlier the corresponding ACK/NACK information is. The concatenated data is the content that needs to be sent by the current slot PUCCH.
When there are a plurality of transmission slots, the uplink control channel information transmitted in each transmission slot is the same. The steps 302 to 303 are repeated for each transmission time slot.
Fig. 6 is a diagram of a mobile communication system according to the present invention. The method according to any one of the embodiments of the present application, further providing a mobile communication system, including a network device and at least one terminal device: the network equipment comprises a network data unit and a network control unit; the network data unit is used for sending downlink data; the network control unit is used for sending information of a downlink control channel and receiving information of an uplink control channel; the terminal equipment comprises a terminal data unit and a terminal control unit; the terminal data unit is used for receiving the downlink data; and the terminal control unit is used for receiving the information of the downlink control channel and sending the information of the uplink control channel.
And after the data of the terminal data unit is received, the terminal control unit feeds back whether the data correctly receives the ACK/NACK information to the network equipment according to the control information sent by the network control unit and the data receiving condition of the terminal data unit. The specific ACK/NACK information is carried by the PUCCH.
The invention can realize PUCCH transmission in the unlicensed frequency band, and supports the support of a plurality of PUCCH transmission time points while reducing the downlink control channel overhead as much as possible, thereby enhancing the system robustness of NR when the NR is independently deployed in the unlicensed frequency band.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. An uplink control channel transmission method is characterized by comprising the following steps:
the information of the downlink control channel indicates that s symbols last from the kth symbol in a plurality of sending time slots, and the information is used for sending the information of the uplink control channel;
in each sending time slot, monitoring the idle resource as the beginning of the nth symbol;
when n is more than or equal to k: if L +1-n is more than or equal to s, continuously sending s symbols from the nth symbol for sending the uplink control channel information, otherwise, not sending;
when n < k: continuously sending s symbols from the kth symbol for sending uplink control channel information;
wherein n, k, s are natural numbers in the range of [1, L ], and L is the number of symbols of each transmission time slot;
the uplink control channel information transmitted in each transmission slot is the same.
2. The uplink control channel fransmission method of claim 1, wherein the fransmission slot is a plurality of consecutive slots.
3. The uplink control channel fransmission method of claim 1, wherein at least one slot interval is included between at least one pair of adjacent fransmission slots.
4. The method for transmitting uplink control channel according to any one of claims 1 to 3, wherein the downlink control channel includes an identifier of the number of transmission time slots.
5. The uplink control channel fransmission method of claim 4, wherein the flag is comprised of M bits corresponding to 2MA state for indicating a combination of the transmission slots; wherein M is an integer of 1 or more.
6. The method as claimed in any of claims 1 to 3, wherein the uplink control channel information includes a plurality of ACK/NACKs.
7. The uplink control channel fransmission method of claim 6, wherein; the plurality of ACK/NACK are arranged in sequence according to the time sequence of the corresponding downlink data transmission.
8. The uplink control channel transmitting method of claim 6, further comprising the steps of:
determining the value of k according to the starting symbol position for transmitting the uplink control channel information in the previous successfully configured transmission time slot;
and determining the value of s according to the number of the continuous symbols for transmitting the uplink control channel information in the transmission time slot successfully configured in the previous time slot.
9. A mobile communication system for implementing the method of any one of claims 1 to 8, comprising a network device and at least one terminal device,
the network equipment comprises a network data unit and a network control unit;
the network data unit is used for sending downlink data;
the network control unit is used for sending information of a downlink control channel and receiving information of an uplink control channel;
the terminal equipment comprises a terminal data unit and a terminal control unit;
the terminal data unit is used for receiving the downlink data;
and the terminal control unit is used for receiving the information of the downlink control channel and sending the information of the uplink control channel.
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| CN201810447988.4A CN110062463B (en) | 2018-05-11 | 2018-05-11 | Mobile communication system and uplink control channel sending method |
| PCT/CN2019/071425 WO2019214282A1 (en) | 2018-05-11 | 2019-01-11 | Mobile communication system and uplink control channel sending method |
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| CN201810447988.4A CN110062463B (en) | 2018-05-11 | 2018-05-11 | Mobile communication system and uplink control channel sending method |
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