CN114006687A

CN114006687A - Sending method, uplink control method, terminal and network side equipment

Info

Publication number: CN114006687A
Application number: CN202111636028.0A
Authority: CN
Inventors: 曹丽芳; 江天明; 邓伟; 丁海煜; 黄宇红
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-01-05
Filing date: 2021-12-30
Publication date: 2022-02-01

Abstract

The embodiment of the application provides a sending method, an uplink control method, a terminal and network side equipment, belonging to the technical field of wireless communication, wherein the sending method applied to the terminal comprises the following steps: receiving first information sent by a network side device, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier; and after the target carrier is switched to, sending second information by adopting the target carrier according to the first uplink timing advance, wherein the second information comprises uplink data and/or a channel detection reference signal. According to the embodiment of the application, after the target carrier is switched to, the uplink information is sent by using the uplink timing advance corresponding to the target carrier, so that the problem of performance reduction caused by TA (timing advance) can be avoided, and the uplink performance of the terminal is maximized.

Description

Sending method, uplink control method, terminal and network side equipment

Technical Field

The embodiment of the application relates to the technical field of wireless communication, in particular to a sending method, an uplink control method, a terminal and network side equipment.

Background

In order to meet the increasing demand of wireless throughput, a Carrier Aggregation (CA) technology is introduced to improve the peak rate of a single user and improve user experience, and especially, the occurrence of various live broadcast services and services in the vertical industry such as Augmented Reality (AR)/Virtual Reality (VR), video return and the like puts higher requirements on the uplink rate, but limited terminal radio frequency is limited, the uplink can only be sent twice at the same time, that is, only two Power Amplifiers (PA) can work at the same time. The uplink carrier aggregates F1 carriers and F2 carriers, and there are two data transmission schemes for the maximum two terminals:

in the first scheme, F1 carriers send a stream, and F2 carriers send a stream, so that concurrence is allowed;

scheme two, Time Division Multiplexing (TDM) transmission is performed between two carriers.

For the scheme that the terminal sends out the first flow in the two frequency bands, the user cannot obtain better experience. However, for the scheme two that supports the uplink round robin function, if the coverage difference between two carriers making the CA is large, there are scenarios such as 2.6G and 700M shown in fig. 1, that is, cross-site CA, where there are large probability of a Remote Radio Unit (RRU)/Active Antenna processing Unit (AAU), and distances from a User (i.e., a terminal (UE)) to two base station antennas are different, Timing Advance (TA) is different (as shown in fig. 2), and the influence caused by TA needs to be considered when carrying out round robin, otherwise uplink interference is easily caused.

Disclosure of Invention

In view of this, embodiments of the present application provide a sending method, an uplink control method, a terminal, and a network side device, so as to solve the problem that uplink interference caused by TA is likely to occur when uplink round robin is adopted in uplink carrier aggregation at present.

In order to solve the foregoing technical problem, in a first aspect, an embodiment of the present application provides a transmission method, which is applied to a terminal, and includes:

receiving first information sent by a network side device, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier;

and after the target carrier is switched to, sending second information by adopting the target carrier according to the first uplink timing advance, wherein the second information comprises uplink data and/or a channel detection reference signal.

Optionally, the first uplink timing advance is determined according to a timing advance corresponding to the target carrier, which is determined by the network side device history.

Optionally, after the handover to the target carrier is performed, sending the second information by using the target carrier according to the first uplink timing advance includes:

and if the second uplink timing advance corresponding to the carrier before switching is greater than the first uplink timing advance, waiting for a first time length after switching is completed to send the second information, wherein the first time length is equal to the difference between the second uplink timing advance and the first uplink timing advance.

Optionally, the method further includes:

receiving third information sent by the network side device, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; alternatively, the first and second electrodes may be,

receiving fourth information and fifth information sent by the network side device, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate, to the terminal, that M symbols before the uplink resources scheduled by the fourth information are not used to transmit the second information;

the M is determined according to the maximum value of the difference value between a second uplink timing advance corresponding to the carrier before switching and the first uplink timing advance and the subcarrier interval of the target carrier; wherein M is a natural number.

Optionally, after the switching to the target carrier, before the sending, by using the target carrier, the second information according to the first uplink timing advance, the method further includes:

and determining that a first symbol in a switching time slot of a first carrier starts to be switched according to the carrier switching time delay, the uplink symbol number occupied by a switching target carrier in the switching time delay and the first uplink timing advance, wherein the first carrier is one of a carrier before switching and the target carrier.

Optionally, the first carrier is determined according to at least one of a carrier bandwidth, a service data guarantee requirement, a path loss, and a channel sounding reference signal transmission requirement.

Optionally, receiving the first information sent by the network side device includes:

and receiving a media access control unit sent by the network side equipment, wherein the media access control unit carries the first information.

In a second aspect, an embodiment of the present application further provides an uplink control method, which is applied to a network side device, and includes:

and sending first information to a terminal, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier, and the terminal adopts the target carrier and sends second information according to the first uplink timing advance, and the second information comprises uplink data and/or a channel sounding reference signal.

Optionally, the method further includes:

sending third information to the terminal, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; alternatively, the first and second electrodes may be,

sending fourth information and fifth information to the terminal, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate to the terminal that M symbols before uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the sending the first information to the terminal includes:

and the sending terminal sends a media access control unit, and the media access control unit carries the first information.

In a third aspect, an embodiment of the present application further provides a terminal, including:

a receiving module, configured to receive first information sent by a network side device, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover;

and a first sending module, configured to send, by using the target carrier and according to the first uplink timing advance, second information after switching to the target carrier, where the second information includes uplink data and/or an SRS.

Optionally, the first sending module is configured to wait for a first time period to send the second information after the handover is completed if a second uplink timing advance corresponding to the carrier before the handover is greater than the first uplink timing advance, where the first time period is equal to a difference between the second uplink timing advance and the first uplink timing advance.

Optionally, the first scheduling information receiving module is configured to receive third information sent by the network side device, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; alternatively, the first and second electrodes may be,

a second scheduling information receiving module, configured to receive fourth information and fifth information sent by the network side device, where the fourth information is used to schedule an uplink resource for transmitting the second information on the target carrier after being switched to the target carrier, and the fifth information is used to indicate, to the terminal, that M symbols before the uplink resource scheduled by the fourth information are not used to transmit the second information;

Optionally, the terminal further includes:

and the determining module is used for determining that a first symbol in a switching time slot of a first carrier starts to be switched according to the carrier switching time delay, the number of uplink symbols occupied by a switching target carrier in the switching time delay and the first uplink timing advance, wherein the first carrier is one of a carrier before switching and the target carrier.

Optionally, the receiving module is further configured to receive a media access control unit sent by the network side device, where the media access control unit carries the first information.

In a fourth aspect, an embodiment of the present application further provides a network side device, including:

a second sending module, configured to send first information to a terminal, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover, and the terminal sends second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or a channel sounding reference signal.

Optionally, the network side device further includes:

a first scheduling information sending module, configured to send third information to the terminal, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after being switched to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of uplink resources that can be actually scheduled; alternatively, the first and second electrodes may be,

a second scheduling information sending module, configured to send fourth information and fifth information to the terminal, where the fourth information is used to transmit uplink resources of the second information on the target carrier after being scheduled and switched to the target carrier, and the fifth information is used to indicate, to the terminal, that M symbols before the uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the second sending module is further configured to send a media access control unit to the terminal, where the media access control unit carries the first information.

In a fifth aspect, an embodiment of the present application further provides a terminal, including: a transceiver and a processor;

the transceiver is configured to receive first information sent by a network side device, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier to be switched;

the transceiver is further configured to send, by using the target carrier, second information according to the first uplink timing advance after switching to the target carrier, where the second information includes uplink data and/or a channel sounding reference signal.

Optionally, the transceiver is configured to wait for a first time period to send the second information after the handover is completed if a second uplink timing advance corresponding to the carrier before the handover is greater than the first uplink timing advance, where the first time period is equal to a difference between the second uplink timing advance and the first uplink timing advance.

Optionally, the transceiver is further configured to receive third information sent by the network side device, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; or receiving fourth information and fifth information sent by the network side device, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate, to the terminal, that M symbols before the uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the processor is configured to determine, according to a carrier switching delay, an uplink symbol number occupied by a switching target carrier in the switching delay, and the first uplink timing advance, that a first symbol in a switching time slot of a first carrier starts switching, where the first carrier is one of a carrier before switching and the target carrier.

Optionally, the transceiver is configured to receive a media access control unit sent by a network side device, where the media access control unit carries the first information.

In a sixth aspect, an embodiment of the present application further provides a network side device, including: a transceiver and a processor;

the transceiver is configured to send first information to a terminal, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier to be switched, and the terminal sends second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or a channel sounding reference signal.

Optionally, the transceiver is further configured to send third information to the terminal, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; or sending fourth information and fifth information to the terminal, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate to the terminal that the first M symbols of the uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the transceiver is configured to send a media access control unit to a terminal, where the media access control unit carries the first information.

In a seventh aspect, an embodiment of the present application further provides a terminal, including a memory, a processor, and a program stored in the memory and executable on the processor; the processor implements any of the steps of the above-described transmission method applied to the terminal when executing the program.

In an eighth aspect, an embodiment of the present application further provides a network-side device, including a memory, a processor, and a program stored in the memory and executable on the processor; and when executing the program, the processor realizes any one of the steps of the uplink control method applied to the network side equipment.

In a ninth aspect, an embodiment of the present application further provides a readable storage medium, where a program is stored, and the program, when executed by a processor, implements the steps in any of the above-mentioned methods for transmitting a terminal or implements the steps in any of the above-mentioned methods for uplink control applied to a network-side device.

The beneficial effects of the above technical scheme of the embodiment of the application are as follows:

according to the embodiment of the application, after the target carrier is switched to, the uplink information (namely the second information) is sent by using the uplink timing advance corresponding to the target carrier, so that the problem of performance reduction caused by TA (timing advance) can be avoided, and the uplink performance of the terminal is maximized.

The embodiment of the application can be applied to an uplink carrier aggregation uplink transmission technology, specifically, inter-band uplink carrier aggregation supporting an uplink transmission function, and a cross-station Downlink (DL) carrier aggregation technology introducing a channel sounding reference signal transmission function.

Drawings

Fig. 1 is a schematic diagram of cross-station uplink carrier aggregation;

fig. 2 is a schematic diagram of timing advance when cross-station uplink carrier aggregation is performed;

fig. 3 is a flowchart illustrating a transmission method according to a first embodiment of the present application;

fig. 4 is a flowchart illustrating an uplink control method according to a second embodiment of the present application;

fig. 5 is a schematic diagram of a switching point when carrier aggregation is performed between 2.6G and 700M in the embodiment of the present application;

FIG. 6 is a schematic diagram illustrating a switching position from 700M to 2.6G in an embodiment of the present application;

FIG. 7 is a schematic diagram of switching positions from 2.6G to 700M in the embodiment of the present application;

fig. 8 is a schematic interaction diagram between a terminal and a base station in the embodiment of the present application;

FIG. 9 is a schematic diagram of another 700M to 2.6G switching position in the embodiment of the present application;

FIG. 10 is a schematic diagram of another 2.6G-700M switching position in the embodiment of the present application;

fig. 11 is a schematic diagram of a switching point when carrier aggregation is performed between 2.6G and 4.9G in the embodiment of the present application;

FIG. 12 is a schematic diagram of a switching position from 4.9G to 2.6G in the embodiment of the present application;

FIG. 13 is a schematic diagram of the switching positions from 2.6G to 4.9G in the embodiment of the present application;

fig. 14 is a schematic structural diagram of a terminal in a third embodiment of the present application;

fig. 15 is a schematic structural diagram of a network-side device in the fourth embodiment of the present application;

fig. 16 is a schematic structural diagram of a terminal according to a fifth embodiment of the present application;

fig. 17 is a schematic structural diagram of a network-side device in a sixth embodiment of the present application;

fig. 18 is a schematic structural diagram of a terminal in a seventh embodiment of the present application;

fig. 19 is a schematic structural diagram of a network-side device in an eighth embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description of the embodiments are intended to be within the scope of the present disclosure.

An important feature of uplink transmission is that different UEs have orthogonal multiple access (orthogonal multiple access) in time and frequency, i.e. uplink transmissions from different UEs in the same cell do not interfere with each other. To ensure orthogonality of uplink transmissions and avoid intra-cell (intra-cell) interference, a base station (gNodeB, gNB) requires that signals from different UEs of the same subframe but different frequency domain resources (different RBs) arrive at the gNB substantially aligned in time. Since the gNB can correctly decode the uplink data as long as it receives the uplink data transmitted by the UE within the Cyclic Prefix (Cyclic Prefix), the uplink synchronization requires that the time when signals from different UEs in the same subframe reach the gNB fall within the Cyclic Prefix range. When the TA of each user in the same cell is not updated, and the time for uplink data of different users to reach the base station is different, uplink interference is likely to occur, so when performing cross-station uplink carrier aggregation, if the time for uplink data of a user to reach a certain carrier is outside a Cyclic Prefix (CP) or is different from the time for uplink data of other users to reach the base station, the uplink interference problem occurs, and the current uplink carrier aggregation adopts an uplink round-robin transmission technology without considering the influence brought by the TA, so improvement is needed.

Referring to fig. 3, fig. 3 is a schematic flowchart of a sending method according to an embodiment of the present application, where the method is applied to a terminal and includes the following steps:

step 31: receiving first information sent by a network side device, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier;

it can be understood that the first uplink timing advance may be used to update the transmission time when the terminal transmits the second information.

Step 32: and after the target carrier is switched to, sending second information by adopting the target carrier according to the first uplink timing advance, wherein the second information comprises uplink data and/or a channel Sounding Reference Signal (SRS).

The embodiment of the application can be applied to cross-AAU/RRU uplink carrier aggregation or Supplement Uplink (SUL) as uplink carrier aggregation, specifically, inter-band uplink carrier aggregation supporting an uplink transmission function, or can also be applied to cross-station Downlink (DL) carrier aggregation technology introducing an SRS transmission function.

The above-described transmission method is exemplified below.

Optionally, the first uplink timing advance is determined according to the timing advance corresponding to the target carrier and determined by the network side device history, that is, the network side device (such as the base station) may obtain the latest TA (first uplink timing advance) in different manners to update the terminal uplink data transmission time.

Optionally, the terminal receives a media access control unit sent by the network side device, where the media access control unit carries the first information.

When the terminal is not switched to the target carrier, the network side equipment cannot obtain the uplink timing advance aiming at the target carrier and can only determine according to the historical timing advance. For example, the uplink timing advance is determined according to the last determined uplink timing advance.

Optionally, the method further includes:

In other optional specific embodiments, if the terminal receives the third information sent by the network side device or receives the fourth information and the fifth information sent by the network side device, the terminal may also send the second information according to the uplink timing advance of the source carrier instead of sending the second information according to the first uplink timing advance.

Optionally, after the switching to the target carrier, before sending the second information according to the first uplink timing advance, the method further includes:

The uplink symbol number occupied by the handover target carrier in the handover delay may specifically be an uplink symbol number required to be used for handover of the target carrier in the handover delay, for example, the uplink symbol number required to be used for SRS transmission in the target carrier and the uplink symbol required to be used for uplink data transmission in the target carrier are included.

The embodiment of the application can be suitable for a scene that two carriers have uplink collision or the two carriers have no uplink collision but the time difference value (special time slot needs to be considered) is not larger than the switching time delay.

Optionally, the first carrier is determined according to at least one of a carrier bandwidth, a service data guarantee requirement, a path loss, and an SRS transmission requirement. I.e. which carrier the delay loss is in, according to at least one of bandwidth, service data guarantee requirement, path loss and SRS transmission requirement.

The embodiment of the application determines the carrier wave with switching delay loss according to the principle of minimizing performance loss.

Referring to fig. 4, fig. 4 is a flowchart illustrating an uplink control method according to a second embodiment of the present application, where the method is applied to a network side device, and includes the following steps:

step 41: and sending first information to a terminal, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier, and the terminal adopts the target carrier and sends second information according to the first uplink timing advance, and the second information comprises uplink data and/or SRS.

Optionally, the network side device sends a media access control unit to the terminal, where the media access control unit carries the first information.

The embodiment of the application can be applied to an uplink carrier aggregation uplink transmission technology, specifically, inter-band uplink carrier aggregation supporting the uplink transmission function, and can also be applied to a cross-station Downlink (DL) carrier aggregation technology introducing the SRS transmission function.

Optionally, the method further includes:

The embodiments of the present application provide technical solutions corresponding to the embodiments and having the same inventive concept, and can achieve the same technical effects.

The technical solution provided by the present application is described below by taking uplink carrier aggregation of a 2.6G carrier (F1 carrier, TDD carrier) and a 700M carrier (F2 carrier, FDD carrier) as an example.

Considering the terminal implementation capability, the process of switching off and starting up the PA is required for switching two antennas from one carrier to another carrier, and the time is required for switching on the PA, so that three levels of switching delays, 35 μ s, 140 μ s and 210 μ s respectively, are introduced in the related art, and the symbol number correspondence of carriers with different switching delays and different subcarrier intervals (SCS) is as follows:

number of symbols	35μs	140μs	210μs
				SCS=15KHz	1	2	3
SCS=30KHz	1	4	6
				SCS=60KHz	2	8	12

The switching is divided into two times of switching from the F2 carrier to the F1 carrier and from the F1 carrier to the F2 carrier by the alternate transmission of the F1 carrier and the F2 carrier, and two switching points can be seen according to the frame structure of the two carriers shown in fig. 5:

first switching point: 700M to 2.6G, currently, the industry considers that a special Time Slot of 2.6G transmits SRS, and the switching delay needs 3 symbols of 700M at maximum, so as shown in fig. 6, switching is started at 13-3-2=8 symbols of 700M, that is, SRS is transmitted on 4 Uplink Pilot Time slots (UpPTS) of the special Time Slot of 2.6G after switching is successful.

Second switching point: 2.6G to 700M, the industry currently considers that 700M bandwidth is small, as shown in fig. 7, and the handover occurs at 700M.

Referring to fig. 2, when uplink carrier aggregation is performed on a 2.6G carrier (F1 carrier, TDD carrier) and a 700M carrier (F2 carrier, FDD carrier), TA may exist in a part of the area, so that the problem of TA difference needs to be considered when the station is further crossed.

For example, a Normal cyclic prefix (Normal CP, NCP) of the 700M band is 4.6us @15KHz, a coverage distance deviation range correspondingly tolerated under LOS is about 1.38Km, and a coverage distance is shortened under NLOS; according to the network building of 700MHz and 2.6GHz 1:3, the 2.6G coverage radius is about 300 m-400 m, the 700MHz coverage radius is 600-700 m, and basically within the CP tolerance error of 700 MHz. However, NCP 2.3us @30KHz in the 700MHz band has a coverage deviation range Of about 700m that is correspondingly tolerated under Line Of Sight (LOS), and under No Line Of Sight (NLOS), the coverage is shortened, and the TA difference in a partial region falls outside the CP tolerance range Of 700 MHz. This aspect effect needs to be considered when scheduling. By updating the DCI scheduling position information and combining with TA information of a Media Access Control (MAC) Control unit (CE), the uplink interference problem caused by TA difference can be completely avoided.

If the coverage radius of 700MHz is 700m, if the influence of NLOS is not considered, the time delay brought by TA difference can be estimated to be 2.3 microseconds according to calculation, and the length of one symbol is not exceeded.

Assume SCS = SCS _ F1 for F1 carrier, SCS = SCS _ F2 for F2 carrier, switching delay is T, the number of symbols occupied by the switching target frequency (i.e., target carrier) in the switching slot is M, the latest TA value for F1 carrier is TA _ F1, and the latest TA value for F2 carrier is TA _ F2. Referring to fig. 8, the specific process is as follows:

1. the terminal reports the supported switching time delay capability (uplink Txswitching period 35 mu s/140 mu s/210 mu s) to the base station;

2. the network side equipment indicates a switching position (uplinkTxSwitchperiodically location-r 16) and a target frequency (namely a target carrier) (uplinkTxSwitchCarrier-r 16) to the terminal through an RRC message;

3. the base station updates switching position (uplinktxswitching period location-r 16) information in real time through the MAC CE, including the carrier and/or the symbol position switched by the terminal at which the switching delay symbol loss is located, i.e., uplinktxswitching period location-r16= location (T, M, TA), where location is a function and can be calculated according to the switching delay, the number of symbols occupied by the switching target frequency in the switching slot, and the timing advance TA of the switching target frequency to obtain the switching position.

The updating mode of the inter-carrier switching position (i.e. uplink txswitching periodic location-r 16) can be obtained by adding a field in the MAC CE or directly calculating by the base station according to the Timing Advance Command (TAC) and the switching position (i.e. uplink txswitching periodic location-r 16) sent by the RRC.

Considering that the bandwidth of a 2.6G carrier is 100MHz, the bandwidth of 700M is only 30MHz, the alternate transmission among uplink carriers is mainly used for improving the uplink performance of a good-middle point of the 2.6G, considering the problem of limited coverage and terminal power, and the terminal at the 2.6G difference point position can directly transmit at 700M, so that the optimal uplink performance can be ensured, and the loss caused by the switching time delay among the carriers is considered to be put on the 700M carrier.

First, regarding switching of F2 carrier to F1 carrier (as shown in the first box of fig. 5 and fig. 9), i.e. switching of uplink symbol between UL timeslot of F2 carrier and special timeslot (6 DwPTS: 4 GP: 4 UpPTS) of F1 carrier:

1. assuming that no uplink data is transmitted in the special slot of the F1 carrier, only SRS is transmitted (at least M =2 symbols of the F1 carrier is required, which is equivalent to the number of symbols M' = M/SCS _ F1 × SCS _ F2 of the F2 carrier), that is, SRS of the F1 carrier is preferentially guaranteed, and then traffic of the F2 carrier is transmitted:

a) when the terminal only supports the single transmission of the F2 carrier, the switching delay needs the symbol number of the F2 carrier: n '= ROUNDUP { T/35 × SCS _ F2/30KHz } then the terminal selects the (13-N') th symbol of the timeslot in F2 carrier to switch one antenna to F1 carrier, meanwhile, considering TA _ F1 influence, considering that the coverage of 700M is larger, the user location is farther from 700M, so TA _ F1< TA _ F2, the terminal adjusts the time for transmitting data at 700MHz according to TA _ F2, when switching to 2.6GHz, the time for waiting TA _ F2-TA _ F1 to retransmit data can just fall to the beginning of 2.6GHz timeslot because TA _ F1 is smaller. The other antenna is always on the F1 carrier, so that SRS transmission of the F1 carrier (SRS is single-shot) can be guaranteed.

b) When the terminal supports dual-transmission of F2 carriers, the number of symbols of F2 carriers is required for the switching delay: n ' = ROUNDUP { T/35 × SCS _ F2/30KHz }, in order to guarantee SRS transmission of F1 carrier, one antenna is switched to F1 carrier at the (13-N ' -M ') th symbol of the slot of F2 carrier, and the other antenna is also switched to F1 carrier at the (13-N ') th symbol, so that scheduling opportunities of M ' symbol 1 streams of F2 carrier can be increased to improve rate and capacity. After switching to the carrier F1, the data transmission needs to wait for the time of TA _ F2-TA _ F1.

2. Suppose that uplink data and SRS are transmitted in a special slot of F1 carrier (at least M =2 symbols are needed), i.e. SRS of F1 carrier is guaranteed preferentially, and then traffic transmission of F1 carrier:

a) when the terminal only supports single transmission of F2 carriers, if N 'symbols are needed for switching delay, the terminal selects the (13-N' -4) th symbol of the time slot to switch one antenna to the F1 carrier, the other symbol is always on the F1 carrier to ensure SRS transmission of the F1 carrier, and the terminal needs to wait for TA _ F2-TA _ F1 time to transmit data after switching to the F1 carrier.

b) When the terminal supports the dual-transmission of the F2 carrier, if N ' symbols are needed by the switching delay, two antennas are switched to the F1 carrier in the (13-N ' -M ') th symbol of the time slot of the F2 carrier. After switching to the carrier F1, the data transmission needs to wait for the time of TA _ F2-TA _ F1.

Secondly, regarding switching from the F1 carrier to the F2 carrier (as described in the second block of fig. 5 and fig. 10), i.e., switching from the uplink timeslot of the F1 carrier to the uplink timeslot of the F2 carrier:

1. suppose priority provisioning F1 carrier traffic:

a) considering that the coverage of 700M is larger, and the user location is farther from 700M, therefore TA _ F1< TA _ F2, the terminal adjusts the time for transmitting data at 2.6GHz according to TA _ F1, when switching to 700MHz, since TA _ F2 is larger, but TA _ F2-TA _ F1 does not exceed a symbol length, the terminal needs to add one symbol for non-scheduling except for the switching delay, i.e. updating the scheduling symbol location information of DCI. If the switching delay needs N 'symbols of the F2 carrier, the switching is started after the end of the uplink timeslot of the F1 carrier, that is, data transmission starts at the N' +2 th symbol of the F2 carrier, that is, the first N '+ 1 symbol is empty, and the time for transmitting data in advance of TA _ F2-TA _ F1 can just fall to the beginning of the N' +2 th symbol of 700 MHz.

2. Suppose priority guarantee F2 carrier service

a) When the terminal only supports single transmission of the F2 carrier, the antenna is kept at the F2 carrier all the time, and the other antenna is kept at the F1 carrier all the time, so that the condition that the F1 carrier is switched to the F2 carrier does not exist.

b) When the terminal supports dual transmission of the F2 carrier, if the F2 carrier is preferentially guaranteed, the antenna is kept at the F2 carrier all the time, and the F1 carrier does not need to be switched, so that the situation that the F1 carrier is switched to the F2 carrier does not exist.

When the embodiment of the application is applied to a cross-station Downlink (DL) carrier aggregation scene with an SRS round-robin function, that is, 700M +2.6G DL CA, 700M is a main carrier, SRS is transmitted at 2.6G, and the switching position of the uplink carrier aggregation is multiplexed.

The technical solution provided by the present application is described below by taking uplink carrier aggregation of a 2.6G carrier (F1 carrier, TDD carrier) and a 4.9G carrier (F2 carrier, TDD carrier) as examples.

First, regarding switching of F2 carrier to F1 carrier (as shown in the first box of fig. 11 and fig. 12), i.e. switching of uplink symbol between UL timeslot of F2 carrier and special timeslot (6 DwPTS: 4 GP: 4 UpPTS) of F1 carrier:

considering that the bandwidths of the 2.6G and 4.9G carriers are both 100MHz, in order to preferentially ensure that the SRS of 2.6G is normally transmitted in a special time slot, the loss caused by the inter-carrier switching delay is considered below and is put on the 4.9G carrier.

a) generally, TDD is slightly higher in frequency band, and both uplink and uplink transmissions are supported, so that the single transmission case is not considered for the moment, and the number of symbols of an F2 carrier is required for switching delay: n' = ROUNDUP { T/35 × SCS _ F2/30KHz }, mainly considering that the coverage of 2.6G is larger, and the user location is farther from 2.6G, therefore, TA _ F1> TA _ F2, the terminal adjusts the time for transmitting data at 4.9GHz according to TA _ F2, when switching to 2.6GHz, the terminal needs to add one symbol for non-scheduling except for the switching delay, i.e. updating the scheduling symbol location information of DCI, because TA _ F1 is larger, but TA _ F2-TA _ F1 does not exceed one symbol length. In order to ensure the SRS transmission of the F1 carrier, one antenna is switched to the F1 carrier in the (13-N ' -M ') th symbol of the slot of the F2 carrier, and the transmission data can just fall to the beginning of the 13-N ' +1 th symbol of 2.6GHz by advancing the TA _ F1-TA _ F2 time. Switching another antenna to the F1 carrier in the (13-N ') th symbol, and advancing TA _ F1-TA _ F2 by the time the transmitted data can just fall to the beginning of the 2.6GHz 13-N ' -M ' +1 th symbol. This may increase the scheduling opportunity for the M' symbol 1 streams of F2 carriers to improve rate and capacity.

a) generally, the TDD band is slightly higher, and both uplink dual transmissions are supported, so that the single transmission case is not considered for the moment, and if N ' symbols are needed for the switching delay, two antennas are switched to the F1 carrier at the (13-N ' -M ') th symbol of the time slot of the F2 carrier.

Secondly, regarding the switching of the F1 carrier to the F2 carrier (as shown in the second block of fig. 11 and fig. 13), that is, the uplink timeslot of the F1 carrier is switched to the uplink timeslot of the F2 carrier:

considering that when 2.6G is switched to 4.9G, 4.9G is a downlink slot of 10 symbols, which is larger than the switching delay, so that the loss caused by switching does not need to be considered, only the uplink data transmission time at F2 needs to be considered to be updated according to TA _ F2, that is, the data can be retransmitted before the time of TA _ F2, and then the data can just fall to the beginning of a 4.9GHz symbol.

When the embodiment of the application is applied to a cross-station Downlink (DL) carrier aggregation scene with an SRS round-robin transmission function, namely 2.6G +4.9G DL CA, a main carrier is selected as a downlink time, and an SRS is transmitted on an auxiliary carrier, but uplink SRS transmission is performed on the auxiliary carrier in advance according to a TA amount.

Referring to fig. 14, fig. 14 is a schematic structural diagram of a terminal according to a third embodiment of the present application, where the terminal 140 includes:

a receiving module 141, configured to receive first information sent by a network side device, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover;

a first sending module 142, configured to send, after switching to the target carrier, second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or an SRS.

Optionally, the first sending module 142 is configured to wait for a first time length after the switching is completed to send the second information if a second uplink timing advance corresponding to the carrier before the switching is greater than the first uplink timing advance, where the first time length is equal to a difference between the second uplink timing advance and the first uplink timing advance.

Optionally, the terminal 140 further includes:

Optionally, the first carrier is determined according to at least one of a carrier bandwidth, a service data guarantee requirement, a path loss, and an SRS transmission requirement.

Optionally, the receiving module 141 is further configured to receive a media access control unit sent by a network side device, where the media access control unit carries the first information.

The embodiments of the present application are product embodiments corresponding to the embodiments of the method described above, and therefore, detailed descriptions thereof are omitted here, and please refer to the first embodiment.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a network-side device according to a fourth embodiment of the present application, where the network-side device 150 includes:

a second sending module 151, configured to send first information to a terminal, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover, and the terminal sends second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or an SRS.

Optionally, the network-side device 150 further includes:

and the M is determined according to the maximum value of the difference value between the second uplink timing advance corresponding to the carrier before switching and the first uplink timing advance and the subcarrier interval of the target carrier.

Optionally, the second sending module 151 is further configured to send a media access control unit to the terminal, where the media access control unit carries the first information.

The embodiment of the present application is a product embodiment corresponding to the embodiment of the method described above, and therefore, detailed description is omitted here, and please refer to the second embodiment.

Referring to fig. 16, fig. 16 is a schematic structural diagram of a terminal according to a fifth embodiment of the present application, where the terminal 160 includes: a transceiver 161 and a processor 162;

the transceiver 161 is configured to receive first information sent by a network side device, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover;

the transceiver 161 is further configured to transmit, after switching to the target carrier, second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or an SRS.

Optionally, the transceiver 161 is configured to wait for a first time period to send the second information after the handover is completed if a second uplink timing advance corresponding to the carrier before the handover is greater than the first uplink timing advance, where the first time period is equal to a difference between the second uplink timing advance and the first uplink timing advance.

Optionally, the transceiver 161 is further configured to receive third information sent by the network side device, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; or receiving fourth information and fifth information sent by the network side device, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate, to the terminal, that M symbols before the uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the processor 162 is configured to determine, according to a carrier switching delay, an uplink symbol number occupied by a switching target carrier in the switching delay, and the first uplink timing advance, that a first symbol in a switching time slot of a first carrier starts to be switched, where the first carrier is one of a carrier before switching and the target carrier.

Optionally, the transceiver 161 is configured to receive a media access control unit sent by a network side device, where the media access control unit carries the first information.

Referring to fig. 17, fig. 17 is a schematic structural diagram of a network-side device according to a sixth embodiment of the present application, where the network-side device 170 includes: a transceiver 171 and a processor 172;

the transceiver 171 is configured to send first information to a terminal, where the first information is used to indicate a first uplink timing advance corresponding to a target carrier for handover, and the terminal sends second information according to the first uplink timing advance by using the target carrier, where the second information includes uplink data and/or an SRS.

Optionally, the transceiver 171 is further configured to send third information to the terminal, where the third information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the uplink resources scheduled by the third information do not include the first M symbols of the uplink resources that can be actually scheduled; or sending fourth information and fifth information to the terminal, where the fourth information is used to schedule uplink resources for transmitting the second information on the target carrier after switching to the target carrier, and the fifth information is used to indicate to the terminal that the first M symbols of the uplink resources scheduled by the fourth information are not used to transmit the second information;

Optionally, the transceiver 171 is configured to send a media access control unit to a terminal, where the media access control unit carries the first information.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a terminal according to a seventh embodiment of the present application, where the terminal 180 includes a processor 181, a memory 182, and a program stored in the memory 182 and operable on the processor 81; the processor 81 implements the following steps when executing the program:

and after the target carrier is switched to, sending second information by adopting the target carrier according to the first uplink timing advance, wherein the second information comprises uplink data and/or SRS.

Optionally, the processor 181 may further implement the following steps when executing the program:

after the target carrier is switched to, sending the second information by using the target carrier according to the first uplink timing advance, including:

after the second information is switched to the target carrier, before the second information is sent by using the target carrier according to the first uplink timing advance, the method further includes:

The specific working process of the embodiment of the present application is the same as that of the first embodiment of the method, and therefore, detailed description is not repeated here, and please refer to the description of the method steps in the first embodiment.

Referring to fig. 19, fig. 19 is a schematic structural diagram of a network-side device 190 according to an eighth embodiment of the present application, where the network-side device 190 includes a processor 191, a memory 192, and a program stored in the memory 192 and capable of running on the processor 191; the processor 191, when executing the program, performs the steps of:

and sending first information to a terminal, wherein the first information is used for indicating a first uplink timing advance corresponding to a switched target carrier, and the terminal adopts the target carrier and sends second information according to the first uplink timing advance, and the second information comprises uplink data and/or SRS.

Optionally, the processor 191 may further implement the following steps when executing the program:

The specific working process of the embodiment of the present application is the same as that of the second embodiment of the method, and therefore, detailed description is not repeated here, and please refer to the description of the method steps in the second embodiment.

An embodiment ninth of the present application provides a readable storage medium, where a program is stored, and the program, when executed by a processor, implements the steps in the method for transmitting in the first embodiment or the steps in the method for uplink control in the second embodiment. Please refer to the above description of the method steps in the corresponding embodiments.

The network side device in this embodiment may be a Base Transceiver Station (BTS) in Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (evolved Node B, eNB or eNodeB) in LTE, a relay Station or an Access point, or a Base Station in a future 5G network, and the like, which are not limited herein.

The terminal in the embodiments of the present application may be a wireless terminal or a wired terminal, and the wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a Terminal (User Device or User Equipment), which are not limited herein.

The readable storage medium includes a computer readable storage medium. Computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

The foregoing is a preferred embodiment of the present application and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle described in the present application and should be considered as the scope of protection of the present application.

Claims

1. A sending method applied to a terminal is characterized by comprising the following steps:

2. The method of claim 1, wherein the first uplink timing advance is determined according to a timing advance corresponding to the target carrier and determined by the network side device history.

3. The method of claim 1, wherein the transmitting the second information according to the first uplink timing advance using the target carrier after the switching to the target carrier comprises:

4. The method of claim 1, further comprising:

determining a maximum value of a difference value between a second uplink timing advance corresponding to a carrier before switching and the first uplink timing advance according to the subcarrier interval of the target carrier; wherein M is a natural number.

5. The method of claim 1, wherein after the switching to the target carrier, before transmitting the second information according to the first uplink timing advance using the target carrier, further comprising:

6. The method of claim 5, wherein the first carrier is determined according to at least one of carrier bandwidth, traffic data guarantee requirements, path loss, and channel sounding reference signal transmission requirements.

7. The method of claim 1, wherein receiving the first information sent by the network-side device comprises:

8. An uplink control method is applied to a network side device, and is characterized by comprising the following steps:

9. The method of claim 8, wherein the first uplink timing advance is determined according to a timing advance corresponding to the target carrier and determined by the network side device history.

10. The method of claim 8, further comprising:

11. The method of claim 8, wherein sending the first information to the terminal comprises:

and sending a media access control unit to the terminal, wherein the media access control unit carries the first information.

12. A terminal, comprising:

13. A network-side device, comprising:

14. A terminal, comprising: a transceiver and a processor;

15. A network-side device, comprising: a transceiver and a processor;

16. A terminal comprising a memory, a processor, and a program stored on the memory and executable on the processor; characterized in that the processor implements the steps in the transmission method according to any one of claims 1 to 7 when executing the program.

17. A network side device comprises a memory, a processor and a program which is stored on the memory and can run on the processor; characterized in that the processor implements the steps in the uplink control method according to any one of claims 8 to 10 when executing the program.

18. A readable storage medium, on which a program is stored, which, when being executed by a processor, carries out the steps in the transmission method according to any one of claims 1 to 7 or carries out the steps in the uplink control method according to any one of claims 8 to 10.