CN113812202B

CN113812202B - Communication method and device

Info

Publication number: CN113812202B
Application number: CN202080001565.5A
Authority: CN
Inventors: 罗青全; 花梦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2023-11-17
Anticipated expiration: 2040-04-16
Also published as: CN113812202A; WO2021208042A1

Abstract

The application provides a communication method and a device, and relates to the technical field of communication. In the method, a terminal establishes RRC connection with first access network equipment in a first frequency band, when time domain resources occupied by data to be sent to the first access network equipment and time domain resources occupied by a preamble to be sent to second access network equipment overlap, the terminal determines a first TA adopted when the preamble is sent to the second access network equipment, and sends the preamble to the second access network equipment by adopting the first TA in the second frequency band, wherein the first TA is larger than 0, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data are prevented from overlapping too much, interference is avoided, and the network access success rate is improved. The network systems of the first access network device and the second access network device are different, and the first frequency band and the second frequency band are overlapped.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

Since Uplink (UL) coverage may be smaller than Downlink (DL) coverage in the New Radio (NR) band network, the network may configure an supplemental uplink (supplementary uplink, SUL) carrier for the NR in order to promote uplink coverage for the NR. In a dual connectivity scenario, a terminal may access a long term evolution (long term evolution, LTE) base station and an NR base station, the SUL of which may be the same as the carrier employed by the LTE base station, in which case some terminals need to share the carrier in a time division multiplexed manner. If the terminal accesses the LTE base station first, the terminal needs to transmit data to the LTE base station by using a Timing Advance (TA) when the terminal transmits data to the LTE base station on the carrier, and if the terminal needs to access the NR base station at this time, the terminal needs to transmit a preamble (preamble) to the NR base station, and the TA used by default when transmitting the preamble is 0, which may cause overlapping between time domain resources occupied by the terminal transmitting the preamble to the NR base station and time domain resources occupied by the terminal transmitting the data to the LTE base station, so that the preamble and the data interfere with each other.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which are used for avoiding the problem that a preamble and data interfere with each other under a double-connection scene.

In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:

in a first aspect, a communication method is provided, including: the terminal establishes RRC connection with first access network equipment in a first frequency band; when time domain resources occupied by data to be sent to first access network equipment and time domain resources occupied by a lead code to be sent to second access network equipment overlap, a terminal determines a first TA adopted when the lead code is sent to the second access network equipment, the first TA is larger than 0, and network modes of the first access network equipment and the second access network equipment are different; and the terminal adopts the first TA to send the preamble to the second access network equipment in the second frequency band, and the first frequency band and the second frequency band are overlapped. In the method provided in the first aspect, under the condition that the frequency band (i.e., the first frequency band) where the terminal communicates with the first access network device and the frequency band (i.e., the second frequency band) where the terminal communicates with the second access network device are overlapped, if the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, the terminal can send the preamble to the second access network device by adopting the first TA with the value greater than 0, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data are prevented from overlapping too much, interference is avoided, and the success rate of network access is improved.

In one possible implementation, the first TA is related to the length of the preamble, the longer the preamble, the larger the first TA. In this possible implementation manner, under the condition that other parameters are fixed, as the preamble is longer, the time domain resources occupied by the preamble overlap more with the time domain resources occupied by the data, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the first TA is related to the index of the start symbol of the preamble, the larger the first TA. In this possible implementation manner, under the condition that other parameters are fixed, because the larger the index of the initial symbol of the preamble is, the more the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the length of the preamble is determined according to the preamble format. In this possible implementation manner, a method for determining a length of a preamble is provided.

In one possible implementation, the information indicating the preamble format is carried in the MIB or SIB. In this possible implementation manner, two methods for carrying information in preamble format are provided.

In one possible implementation, the first TA is related to the second TA, and the larger the second TA is, the larger the first TA is, and the second TA is the TA used when the terminal sends data. In this possible implementation manner, under the condition that other parameters are fixed, as the larger the second TA is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, at this time, if the larger the first TA is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap can be better avoided.

In one possible implementation, the method further includes: the terminal receives a message from the first access network device, where the message includes information for determining the second TA.

In one possible implementation, the information for determining the second TA is the value of the second TA, and the second TA is carried in message 2; alternatively, the information for determining the second TA is an offset value for updating the second TA.

In one possible implementation, the first TA is related to an uplink timing offset between the first access network device and the second access network device, and the larger the uplink timing offset, the larger the first TA. In this possible implementation manner, under the condition that other parameters are fixed, as the uplink transmission timing deviation is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap more, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the first TA satisfies the following condition: MAX (0, TA) _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte The method comprises the steps of carrying out a first treatment on the surface of the Wherein TA _{nr_Preamble} For the first TA, MAX is the maximum function, TA _Lte Second TA, T used for transmitting data for terminal _{t_max} For uplink transmission timing offset between a first access network device and a second access network device, DIS _Preamble And transmitting the end time of the preamble to a period from the end time of the time slot to the end of the time slot for the terminal, wherein the time slot is the time slot to which the end time belongs. In this possible implementation manner, the value of the first TA may avoid that the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap too much.

In one possible implementation, the method further includes: the terminal receives a third TA from the second access network device, wherein the third TA is TA calculated by the second access network device for the terminal according to the preamble; and the terminal updates the first TA to a fourth TA, and sends a message 3 to the second access network equipment by adopting the fourth TA, wherein the fourth TA is the sum of the first TA and the third TA. In this possible implementation manner, after the terminal sends the preamble to the second access network device, the second access network device may issue a third TA to the terminal, and since the third TA is measured based on the preamble and the preamble is sent based on the first TA, the actual TA between the terminal and the second access network device should be the sum of the first TA and the third TA (i.e. the fourth TA), so that by updating the first TA, the terminal may send the message 3 to the second access network device with the correct TA (i.e. the fourth TA).

In one possible implementation, the information used to determine the time domain resources of the data is carried in a MIB or SIB.

In one possible implementation, the first access network device is an access network device in an LTE system, and the second access network device is an access network device in an NR system.

In a second aspect, a communication method is provided, including: the terminal establishes RRC connection with first access network equipment in a first frequency band; the terminal sends a preamble to second access network equipment by adopting a first TA in a second frequency band, the network systems of the first access network equipment and the second access network equipment are different, the first frequency band and the second frequency band are overlapped, and the value of the first TA is 0; and when the time domain resources occupied by the data to be sent to the first access network equipment and the time domain resources occupied by the lead code overlap, the terminal delays sending the data to the first access network equipment. In the method provided in the second aspect, in the case that there is an overlap between the frequency band (i.e., the first frequency band) in which the terminal communicates with the first access network device and the frequency band (i.e., the second frequency band) in which the terminal communicates with the second access network device, if the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, the terminal delays sending the data to the first access network device, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data are prevented from overlapping too much, interference is avoided, and the success rate of network access is improved.

In one possible implementation, the terminal delays sending the data to the first access network device, including: the terminal delays sending the data to the first access network device for a first period of time, wherein the first period of time is greater than 0. In this possible implementation manner, the first time period is greater than 0, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data can be prevented from overlapping too much.

In one possible implementation, the first period of time is related to a length of the preamble, and the longer the preamble, the longer the first period of time. In this possible implementation manner, under the condition that other parameters are fixed, as the preamble is longer, the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data more, and at this time, if the first time period is longer, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the first period of time is related to an index of a start symbol of the preamble, and the larger the index of the start symbol of the preamble is, the longer the first period of time is. In this possible implementation manner, under the condition that other parameters are fixed, because the larger the index of the initial symbol of the preamble is, the more the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, if the first time period is longer, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the length of the preamble is determined according to a preamble format. In this possible implementation manner, a method for determining a length of a preamble is provided.

In one possible implementation, the information indicating the preamble format is carried in MIB or SIB. In this possible implementation manner, two methods for carrying information in preamble format are provided.

In one possible implementation, the first period of time is related to a second TA, and the larger the second TA is, the longer the first period of time is, and the second TA is the TA used when the terminal sends the data. In this possible implementation manner, under the condition that other parameters are fixed, as the larger the second TA is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, at this time, if the first time period is longer, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the second TA is determined according to information for determining the second TA; wherein, the information used for determining the second TA is the value of the second TA, and the value of the second TA is carried in the message 2; or, the information for determining the second TA is an offset value for updating the second TA.

In one possible implementation, the first period of time relates to an uplink transmission timing offset between the first access network device and the second access network device, and the larger the uplink transmission timing offset, the longer the first period of time. In the possible implementation manner, under the condition of fixed other parameters, as the uplink transmission timing deviation is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap more, and at this time, if the first time period is longer, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

In one possible implementation, the first period of time is greater than or equal to a second period of time, where the second period of time is: LEN (LEN) _{sul_Preamble} -[(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ]The unit of the second period of time is microseconds. In this possible implementation manner, the value of the first time period may enable the time domain resource occupied by the preamble and the time domain resource occupied by the data to be completely non-overlapping.

In one possible implementation manner, the first access network device is an access network device in an LTE system, and the second access network device is an access network device in an NR system.

In a third aspect, a communication method is provided, including: the terminal establishes RRC connection with first access network equipment in a first frequency band; the terminal sends a preamble to second access network equipment by adopting a first TA in a second frequency band, the network systems of the first access network equipment and the second access network equipment are different, the first frequency band and the second frequency band are overlapped, and the value of the first TA is 0; when the time domain resources occupied by the data to be sent to the first access network equipment and the time domain resources occupied by the preamble overlap, the terminal determines not to send the data to the first access network equipment. In the method provided in the third aspect, in the case that there is an overlap between the frequency band (i.e., the first frequency band) in which the terminal communicates with the first access network device and the frequency band (i.e., the second frequency band) in which the terminal communicates with the second access network device, if the time domain resource occupied by the preamble overlaps with the time domain resource occupied by the data, the terminal does not send the data to the first access network device, thereby avoiding overlapping of the time domain resource occupied by the preamble and the time domain resource occupied by the data, further avoiding interference, and improving the success rate of network access.

In a fourth aspect, a communication method is provided, including: the terminal determines whether time domain resources occupied by data to be sent to the first access network device and time domain resources occupied by a lead code to be sent to the second access network device overlap; the method comprises the steps that TA adopted when the terminal sends the preamble is a first TA with a value of 0, the frequency band of communication between the terminal and the first access network equipment and the frequency band of communication between the terminal and the second access network equipment are overlapped, the terminal establishes RRC connection with the first access network equipment but does not establish RRC connection with the second access network equipment, and the network systems of the first access network equipment and the second access network equipment are different; if so, the terminal delays sending the data to the first access network device so that the overlapping part between the time domain resources occupied by the data and the time domain resources occupied by the preamble is reduced, or the terminal determines not to send the data to the first access network device. In the method provided in the fourth aspect, in the case that there is an overlap between the frequency band (i.e., the first frequency band) in which the terminal communicates with the first access network device and the frequency band (i.e., the second frequency band) in which the terminal communicates with the second access network device, if the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, the terminal delays sending the data to the first access network device, so as to avoid too much overlapping of the time domain resources occupied by the preamble with the time domain resources occupied by the data, or the terminal does not send the data to the first access network device, so as to avoid overlapping of the time domain resources occupied by the preamble with the time domain resources occupied by the data, thereby avoiding interference and improving the success rate of network access.

In one possible implementation, the method further includes: the terminal receives a message from the first access network device, wherein the message comprises information for determining a second TA; the terminal determining whether time domain resources occupied by data to be transmitted to the first access network device and time domain resources occupied by a preamble to be transmitted to the second access network device overlap, including: and the terminal determines whether time domain resources occupied by data to be sent to the first access network equipment and time domain resources occupied by a preamble to be sent to the second access network equipment overlap or not according to the preamble information and the second TA, wherein the preamble information comprises starting symbol information of the preamble sent by the terminal and length information of the preamble. The possible implementation manner provides a method for determining whether the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap.

In a possible implementation manner, the determining, by the terminal, whether the time domain resource occupied by the data to be sent to the first access network device and the time domain resource occupied by the preamble to be sent to the second access network device overlap according to the preamble information and the second TA includes: and the terminal determines whether time domain resources occupied by data to be sent to the first access network equipment and time domain resources occupied by a preamble to be sent to the second access network equipment overlap or not according to the preamble information, the second TA and uplink transmission timing deviation between the first access network equipment and the second access network equipment. In this possible implementation manner, a further method for determining whether the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap is provided.

In one possible implementation, the information for determining the second TA is a value of the second TA, where the value of the second TA is carried in message 2; or, the information for determining the second TA is an offset value for updating the second TA.

In a possible implementation manner, when the preamble information and the second TA meet a first condition and a second condition, time domain resources occupied by the preamble overlap with time domain resources occupied by the data; wherein the first condition is: the time slot of the time domain resource occupied by the lead code and the time slot of the time domain resource occupied by the data are adjacent time slots; the second condition is: LEN (LEN) _{sul_Preamble} ＞(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ，LEN _{sul_Preamble} Mu corresponds to a subcarrier interval adopted when the terminal communicates with the second access network equipment for the length of the preamble, N _{s_sul} Transmitting an index, TA, of a start symbol of the preamble to the terminal _Lte For the second TA, T _{t_max} And timing deviation is transmitted for uplink between the first access network equipment and the second access network equipment. The possible implementation manner provides a method for determining the overlapping of the time domain resources occupied by the preamble and the time domain resources occupied by the data.

In one possible implementation, the terminal delays sending the data to the first access network device, including: the terminal delays a first time period to send the data to the first access network device, wherein the first time period is greater than or equal to a second time period, and the second time period is: LEN (LEN) _{sul_Preamble} -[(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ]The unit of the second period of time is microseconds. In this possible implementation manner, the value of the first time period may enable the time domain resource occupied by the preamble and the time domain resource occupied by the data to be completely non-overlapping.

In a fifth aspect, a communication method is provided, including: the terminal determines whether time domain resources occupied by data to be sent to the first access network device and time domain resources occupied by a lead code to be sent to the second access network device overlap; the method comprises the steps that a frequency band of communication between the terminal and first access network equipment and a frequency band of communication between the terminal and second access network equipment are overlapped, the terminal establishes RRC connection with the first access network equipment but does not establish RRC connection with the second access network equipment, and network systems of the first access network equipment and the second access network equipment are different; if yes, the terminal determines a first TA adopted when the preamble is sent to the second access network equipment, wherein the first TA enables overlapping parts between time domain resources occupied by data to be sent to the first access network equipment and time domain resources occupied by the preamble to be sent to the second access network equipment to be reduced; and the terminal sends the preamble to the second access network equipment according to the first TA. In the method provided in the fifth aspect, in the case that there is an overlap between the frequency band (i.e., the first frequency band) in which the terminal communicates with the first access network device and the frequency band (i.e., the second frequency band) in which the terminal communicates with the second access network device, if the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, the terminal may send the preamble to the second access network device by using the first TA with a value greater than 0, so as to avoid too much overlapping of the time domain resources occupied by the preamble and the time domain resources occupied by the data, thereby avoiding interference and improving the success rate of network access.

In one possible implementation, the method further includes: the terminal receives a message from the first access network device, wherein the message comprises information for determining a second TA; the terminal determining a first TA adopted when transmitting a preamble to a second access network device, including: and the terminal determines a first TA adopted when sending the preamble to the second access network equipment according to the preamble information and the second TA. In one possible implementation, a method for determining a first TA is provided.

In a possible implementation manner, the determining, by the terminal, a first TA used when sending a preamble to the second access network device according to the preamble information and the second TA includes: the terminal determines the first TA according to the preamble information, the second TA and uplink transmission timing deviation between the first access network device and the second access network device. In this possible implementation manner, another method for determining the first TA is provided.

In one possible implementation, the method further includes: the terminal receives a third TA from the second access network device, wherein the third TA is TA calculated by the second access network device for the terminal according to the preamble; and the terminal adopts a fourth TA to send a message 3 to the second access network equipment, wherein the fourth TA is the sum of the first TA and the third TA. In this possible implementation manner, after the terminal sends the preamble to the second access network device, the second access network device may issue a third TA to the terminal, and since the third TA is measured based on the preamble and the preamble is sent based on the first TA, the actual TA between the terminal and the second access network device should be the sum of the first TA and the third TA (i.e. the fourth TA), so that by updating the first TA, the terminal may send the message 3 to the second access network device with the correct TA (i.e. the fourth TA).

In one possible implementation, the first TA is greater than 0. In this possible implementation, the first TA is greater than 0, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data can be prevented from overlapping too much.

In one possible implementation, the first TA satisfies the following condition: MAX (0, TA) _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte The method comprises the steps of carrying out a first treatment on the surface of the Wherein TA _{nr_Preamble} For the first TA, MAX is a maximum function, TA _Lte For the second TA, T _{t_max} For the uplink transmission timing offset between the first access network device and the second access network device, DIS _Preamble And transmitting the end time of the preamble to a period from the end time of the time slot to the end of the time slot for the terminal, wherein the time slot is the time slot to which the end time belongs. In this possible implementation manner, the value of the first TA may avoid the time domain resource occupied by the preambleAnd the time domain resources occupied by the data are overlapped too much.

In a sixth aspect, there is provided a communication apparatus comprising: a processing unit and a communication unit; the processing unit is used for establishing RRC connection with the first access network equipment in the first frequency band through the communication unit; when the time domain resource occupied by the data to be sent to the first access network device and the time domain resource occupied by the preamble to be sent to the second access network device overlap, the processing unit is further configured to determine a first TA adopted when the preamble is sent to the second access network device, the first TA is greater than 0, and network systems of the first access network device and the second access network device are different; and the processing unit is also used for transmitting the lead code to the second access network equipment through the communication unit by adopting the first TA in the second frequency band, and the first frequency band and the second frequency band are overlapped.

In one possible implementation, the first TA is related to the length of the preamble, the longer the preamble, the larger the first TA.

In one possible implementation, the first TA is related to the index of the start symbol of the preamble, the larger the first TA.

In one possible implementation, the length of the preamble is determined according to the preamble format.

In one possible implementation, the information indicating the preamble format is carried in the MIB or SIB.

In one possible implementation, the first TA is related to the second TA, and the larger the second TA, the larger the first TA, and the second TA is the TA used when the communication device transmits data.

In a possible implementation manner, the processing unit is further configured to receive, through the communication unit, a message from the first access network device, where the message includes information for determining the second TA.

In one possible implementation, the information for determining the second TA is a value of the second TA, the value of the second TA being carried in message 2; alternatively, the information for determining the second TA is an offset value for updating the second TA.

In one possible implementation, the first TA is related to an uplink timing offset between the first access network device and the second access network device, and the larger the uplink timing offset, the larger the first TA.

In one possible implementation, the first TA satisfies the following condition: MAX (0, TA) _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte The method comprises the steps of carrying out a first treatment on the surface of the Wherein TA _{nr_Preamble} For the first TA, MAX is the maximum function, TA _Lte Second TA, T used in transmitting data for communication device _{t_max} For uplink transmission timing offset between a first access network device and a second access network device, DIS _Preamble The method comprises the steps of transmitting a period from the end time of a preamble to the end of a time slot for a communication device, wherein the time slot is the time slot to which the end time belongs.

In a possible implementation manner, the processing unit is further configured to receive, through the communication unit, a third TA from the second access network device, where the third TA is a TA calculated by the second access network device for the communication device according to the preamble; and the processing unit is further used for updating the first TA to a fourth TA, and sending a message 3 to the second access network device through the communication unit by adopting the fourth TA, wherein the fourth TA is the sum of the first TA and the third TA.

In a seventh aspect, there is provided a communication apparatus comprising: a processing unit and a communication unit; the processing unit is configured to establish an RRC connection with a first access network device in a first frequency band through the communication unit; the processing unit is further configured to send, in a second frequency band, a preamble to a second access network device through the communication unit by using a first TA, where network systems of the first access network device and the second access network device are different, there is an overlap between the first frequency band and the second frequency band, and a value of the first TA is 0; and when the time domain resources occupied by the data to be sent to the first access network equipment and the time domain resources occupied by the preamble overlap, the processing unit is further configured to delay sending the data to the first access network equipment.

In a possible implementation manner, the processing unit is specifically configured to: and delaying the transmission of the data to the first access network device for a first time period, wherein the first time period is greater than 0.

In one possible implementation, the first period of time is related to a length of the preamble, and the longer the preamble, the longer the first period of time.

In one possible implementation, the first period of time is related to an index of a start symbol of the preamble, and the larger the index of the start symbol of the preamble is, the longer the first period of time is.

In one possible implementation, the length of the preamble is determined according to a preamble format.

In one possible implementation, the information indicating the preamble format is carried in MIB or SIB.

In one possible implementation, the first period of time is related to a second TA, and the larger the second TA, the longer the first period of time, and the second TA is the TA employed when the communication device transmits the data.

In one possible implementation, the first period of time relates to an uplink transmission timing offset between the first access network device and the second access network device, and the larger the uplink transmission timing offset, the longer the first period of time.

In one possible implementation, the first period of time is greater than or equal to a second period of time, where the second period of time is: LEN (LEN) _{sul_Preamble} -[(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ]The unit of the second period of time is microseconds.

An eighth aspect provides a communication apparatus comprising: a processing unit and a communication unit; the processing unit is configured to establish an RRC connection with a first access network device in a first frequency band through the communication unit; the processing unit is further configured to send, in a second frequency band, a preamble to a second access network device through the communication unit by using a first TA, where network systems of the first access network device and the second access network device are different, there is an overlap between the first frequency band and the second frequency band, and a value of the first TA is 0; when the time domain resource occupied by the data to be sent to the first access network device and the time domain resource occupied by the preamble overlap, the processing unit is further configured to determine not to send the data to the first access network device.

In a ninth aspect, there is provided a communication device having a function of implementing any one of the methods provided in the fourth aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The communication device may exist in the form of a chip product.

In a tenth aspect, there is provided a communication device having a function of implementing any one of the methods provided in the fifth aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The communication device may exist in the form of a chip product.

In an eleventh aspect, there is provided a communication apparatus comprising: a processor. The processor is connected to the memory, and the memory is configured to store computer-executable instructions, and the processor executes the computer-executable instructions stored in the memory, thereby implementing any one of the methods provided in any one of the first to fifth aspects. The memory and processor may be integrated, or may be separate devices, for example. In the latter case, the memory may be located within the communication device or may be located external to the communication device.

In one possible implementation, the processor includes logic circuitry, and further includes at least one of an input interface and an output interface. The output interface is for performing the actions of the sending in the respective method, and the input interface is for performing the actions of the receiving in the respective method.

In one possible implementation, the communication device further includes a communication interface and a communication bus, the processor, the memory, and the communication interface being connected by the communication bus. The communication interface is used for executing the actions of the transceiving in the corresponding method. The communication interface may also be referred to as a transceiver. Optionally, the communication interface comprises at least one of a transmitter for performing the act of transmitting in the respective method and a receiver for performing the act of receiving in the respective method.

In one possible implementation, the communication device is present in the form of a chip product.

In a twelfth aspect, there is provided a chip comprising: a processor and an interface through which the processor is coupled to the memory, which when executed by the processor causes the method of any one of the first to fifth aspects to be performed.

In a thirteenth aspect, there is provided a communication system comprising: an access network device and a communication apparatus provided in any one of the sixth to tenth aspects above.

In a fourteenth aspect, there is provided a computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform any one of the methods provided in any one of the first to fifth aspects.

In a fifteenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform any one of the methods provided in any one of the first to fifth aspects.

Technical effects brought about by any implementation manner of the sixth aspect to the fifteenth aspect may be referred to technical effects brought about by corresponding implementation manners of the first aspect to the fifth aspect, and are not described here again.

It should be noted that, on the premise that the schemes are not contradictory, the schemes in the above aspects may be combined.

It should be appreciated that aspects provided by embodiments of the present application may be performed by a computing device, which refers to a device that can be abstracted into a computer system. A computing device that supports wireless communication functionality may be referred to as a wireless communication device. The communication device in the present application may also be referred to as a wireless communication device. The wireless communication device may be a complete machine of the computing device, or may be a part of a device in the computing device, for example, a chip related to a wireless communication function, such as a system chip or a communication chip. Wherein the system chip is also referred to as a system on chip, or SoC chip. Specifically, the wireless communication device may be a terminal such as a smart phone, or may be a system chip or a communication chip that can be provided in the terminal. Further, the wireless communication apparatus may be a radio access network device such as a base station, or may be a related chip, such as an SoC chip or a communication chip, which can be provided in the radio access network device. The communication chip may include a radio frequency processing chip and a baseband processing chip. The baseband processing chip is sometimes also referred to as a modem (modem). In a physical implementation, the communication chip may or may not be integrated within the SoC chip. For example, the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip. By adopting the scheme provided by the embodiment of the application, the problem that the lead codes and the data interfere with each other in a double-connection scene can be avoided as much as possible.

Drawings

Fig. 1 is a flow chart of random access;

fig. 2 is a schematic diagram of configuring a SUL carrier;

FIG. 3 is a schematic diagram of an NSA;

fig. 4 is a schematic diagram of avoiding overlapping of data transmitted on LTE and SUL carriers;

fig. 5 is a schematic diagram illustrating overlapping of time domain resources occupied by a preamble and time domain resources occupied by data;

fig. 6 is a schematic diagram for avoiding overlapping of time domain resources occupied by a preamble and time domain resources occupied by data on a SUL carrier for avoidance;

FIG. 7 is a flow chart of a communication method according to an embodiment of the present application;

fig. 8 is a schematic diagram of a time domain resource occupied by a second TA and a preamble and a time domain resource occupied by data according to an embodiment of the present application;

fig. 9 is a schematic diagram of time domain resources occupied by a preamble and time domain resources occupied by data being not overlapped, which is provided by an embodiment of the present application;

FIG. 10 is a flow chart of a communication method according to an embodiment of the present application;

FIG. 11 is a flow chart of a communication method according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a relationship between parameters for determining a first time period according to an embodiment of the present application;

FIG. 13 is a schematic diagram of a relationship between parameters for determining a first time period according to another embodiment of the present application;

FIG. 14 is a flow chart of a communication method according to an embodiment of the present application;

fig. 15 is a schematic diagram of a communication device according to an embodiment of the present application;

fig. 16 and fig. 17 are schematic hardware structures of a communication device according to an embodiment of the present application;

fig. 18 is a schematic hardware structure of a terminal according to an embodiment of the present application.

Detailed Description

In order to clearly describe the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first access network device and the second access network device are merely intended to distinguish between different access network devices. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

In the present application, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

To facilitate understanding of the following, some concepts or contents mentioned below will be first briefly described.

1. Time slots

A slot is one basic unit of time domain resource allocation. For a normal (normal) Cyclic Prefix (CP), 1 slot contains 14 orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols (hereinafter referred to as symbols). For an extended (extended) CP,1 slot contains 12 symbols.

For convenience of description, in the embodiment of the present application, 1 slot contains 14 symbols unless specifically described. In the time slot, 14 symbols are numbered in order from small to large, the smallest number is 0, and the largest number is 13. In the embodiment of the present application, the symbol with index (i.e. number) i is denoted as symbol i (i is an integer greater than or equal to 0 and less than or equal to 13), and one slot includes symbols 0 to 13. The slot with index (i.e., number) j is denoted as slot j (j is an integer greater than or equal to 0).

2、TA

An important feature of uplink transmission is that uplink transmissions from different terminals in the same cell do not interfere with each other.

In order to avoid intra-cell interference, the access network device requires that signals from different terminals of the same subframe but different frequency domain resources (e.g. different Resource Blocks (RBs)) arrive at the access network device at substantially aligned times. The access network device can correctly decode the uplink data as long as the uplink data sent by the terminal is received within the CP range, so that the uplink synchronization requires that the time when signals from different terminals of the same subframe reach the access network device falls within the CP.

For this purpose, a mechanism of upstream timing advance (Uplink Timing Advance) is proposed. In view of the terminal, the TA is essentially a negative offset (negative offset) between the start time of the received downlink subframe and the time of the transmitted uplink subframe. The access network device may control the time at which the uplink signals from the different terminals arrive at the access network device by appropriately controlling the offset of each terminal. For terminals farther from the access network device, uplink data is sent earlier than for terminals nearer to the access network device due to the larger transmission delay. That is, the TA corresponding to the terminal farther from the access network device is larger than the TA corresponding to the terminal nearer to the access network device.

The TA related in the application is an uplink TA, namely the TA used by the terminal when the terminal transmits the uplink signal.

3. Existing random access mechanisms

The random access flow is used for establishing connection between the terminal and the cell and obtaining uplink synchronization. The kinds of random access are classified into two kinds: contention-based and non-contention-based. Referring to fig. 1, the contention-based random access procedure includes the following steps 101 to 104, and the non-contention-based random access procedure includes the following steps 101 and 102.

101. The terminal sends a message 1 (Msg 1) to the access network device, msg1 comprising a preamble.

The preamble may also be referred to as a random access preamble, a physical random access channel (physical random access channel, PRACH) preamble (PRACH preamble), a random access preamble sequence, a preamble sequence, or the like.

Msg1 may tell the access network device that there is a random access request, and at the same time enable the access network device to estimate the transmission delay between it and the terminal and determine the TA accordingly. Msg1 may be carried on PRACH.

Wherein the PRACH resource and the preamble are selected by the terminal based on the contention random access, different terminals may select the same PRACH resource and the same preamble at the same time, resulting in the occurrence of a collision, and a collision resolution mechanism (i.e. step 103 and step 104) is needed to solve this problem.

Based on non-contention random access, the terminal already has a unique identity cell radio network temporary identity (cell-radio network temporary identifier, C-RNTI) within the accessed cell, and the PRACH resources and preambles are specified by the access network device to ensure that no collision with other terminals occurs, i.e. no collision resolution mechanism is needed (i.e. steps 103 and 104 are not required).

102. The access network device sends a message 2 (Msg 2) to the terminal.

Wherein Msg2 may be a random access response (random access response, RAR).

The Msg2 may include a TA, where the TA is calculated by the access network device according to Msg1 as a terminal.

103. The terminal sends a message 3 (Msg 3) to the access network device.

In step 103, the terminal may send Msg3 to the access network device using the TA in Msg 2.

The Msg3 needs to contain an important information: a conflict resolution identity (UE contention resolution identity) of the terminal, which identity is to be used for conflict resolution of step 104.

104. The access network device sends a message 4 (Msg 4) to the terminal, indicating the contention result of the random access of the terminal.

The access network device carries a conflict resolution identifier of the terminal in the Msg4 in a conflict resolution mechanism to specify the terminal which is successful in conflict resolution, and other terminals which are not successful in conflict resolution initiate random access again.

In the subsequent process, the access network device may periodically calculate an offset value of the TA for the terminal according to the uplink message sent by the terminal, and the terminal determines the TA to be used according to the TA used last time and the offset value.

4. Existing preamble formats (preamble formats)

The preamble format includes a CP portion and a data portion. The preamble format corresponds to 64 preambles, and the indexes of the 64 preambles are sequentially 0 to 63. One preamble may correspond to one or more transmission symbols and the terminal may transmit the preamble on the transmission symbol to which the preamble corresponds.

The preamble format is shown in The communication protocol third generation partnership project (The 3rd Generation Partnership Project,3GPP) technical specification (Technical Specification, TS) 38.211 v15.6.0, as shown in table one (corresponding to table 6.3.3.1-1 in 3GPP TS 38.211 V15.6.0) and table two (corresponding to table 6.3.3.1-2 in 3GPP TS 38.211 V15.6.0). Wherein, L in the table has a value of 839 _RA Refers to a long preamble format, and takes on a value of 139L _RA Refers to a short preamble format. Δf ^RA Indicating the subcarrier spacing (subcarrier spacing, SCS) corresponding to the preamble format. N (N) _u Representing the length of the data portion of the preamble format. Representing the length of the CP portion of the preamble format. Kappa=64. Mu epsilon {0,1,2,3}, the specific value being related to the subcarrier spacing.

Table I shows L _RA =839, and Δf ^RA E {1.25,5} khz preamble format. The second table is L _RA =139, and Δf ^RA ＝15·2 ^μ Preamble format of kHz.

In Table I, N _u Symbol number· (2048+144) κ occupied by the preamble format. In Table II, N _u Symbol number occupied by the preamble format (2048·2 ^-μ +144) κ. "." means "multiply". Since the present application only involves preamble formats of no more than 14 symbols, if the preamble formats are all 12 symbols in length, closest to 14 symbols, in terms of the preamble format length closest to 14 symbols, format 0, format 3 and format B4. That is, in the embodiment of the present application, the preamble format corresponding to the preamble transmitted by the terminal is 12 symbols at maximum.

List one

Watch II

Based on the understanding of the above concepts or contents, the method provided by the embodiment of the present application is specifically described below.

In a conventional communication system, for example, an LTE system, uplink carriers and downlink carriers in the same frequency band need to be bonded and paired, i.e. one uplink carrier corresponds to one downlink carrier, and uplink and downlink are coupled. In NR, the uplink coverage in NR frequency band networking may be smaller than the downlink coverage, for example, the uplink coverage of 3.5G time-division duplex (TDD) is 10dB to 15dB lower than the downlink coverage. Therefore, the NR breaks the design of uplink and downlink coupling in the traditional communication system, and introduces the design of uplink and downlink decoupling. By uplink and downlink decoupling, NR supports configuring multiple uplink carriers in one cell, where a carrier of the NR system may be referred to as a Normal Uplink (NUL) carrier, and an added uplink carrier may be referred to as a SUL carrier. By adding SUL where NR uplink coverage is limited, the uplink throughput of the NR system can be improved. The SUL carrier can be flexibly configured, and can be either a carrier in the existing LTE system or a single uplink carrier.

By way of example, fig. 2 shows an example in which an LTE carrier of 1.8GHz is configured as a SUL carrier of a NR carrier of 3.5GHz, in this example, the frequency of the SUL carrier of 1.8GHz is lower than that of 3.5GHz, the propagation loss (also called path loss) is also smaller, so that the NR uplink coverage can be effectively improved, and the existing carrier of LTE is utilized, so that the cost of an operator is saved.

In an uplink Sharing (UL Sharing) scenario of non-independent Networking (NSA) (e.g., dual connectivity (E-UTRAN NR dual connectivity, EN-DC) networking of an evolved universal terrestrial radio access network (evolved universal terrestrial radio access, E-UTRAN) and NR, referring to fig. 3, a terminal may access two access network devices with different network systems, e.g., an eNB and a gNB, between which an ideal backhaul (ideal backhaul) may be used, or a non-ideal backhaul may be used, an LTE carrier (i.e., a carrier used when the terminal communicates with the eNB) and a SUL carrier may share an LTE low frequency (e.g., a 1.8GHz carrier), i.e., the LTE carrier and the SUL carrier belong to the same carrier with the same bandwidth, and the terminal shares the carrier in a time division multiplexing manner, e.g., during a period, the terminal uses the carrier to send signals to the eNB and during another period, uses the carrier to send signals to the gNB.

Provision for in-band synchronization EN-DC (Intra-Band synchronous EN-DC) according to communication protocol 3GPPTS38.133 V15.6.0: the uplink transmission timing deviation (uplink transmission timing difference) between LTE and NR is limited to 5.21 microseconds (us), i.e. the uplink transmission timing deviation of LTE carrier and SUL carrier with same bandwidth as carrier is within 5.21 us.

When the LTE carrier and the SUL carrier are in the same carrier bandwidth, the existing protocol specifies that, during normal transmission of a service, in order to avoid overlapping of a signal transmitted by the LTE carrier and a signal transmitted by the SUL carrier due to uplink transmission timing deviation, one symbol is scheduled less on the SUL carrier at a time switching point between transmitting the signal to the eNB and transmitting the signal to the gNB. Illustratively, as shown in fig. 4, on the SUL carrier, the access network device schedules one symbol less at the time switch point (i.e., symbol 13 and symbol 0 on the SUL carrier are not scheduled).

When the LTE carrier and the SUL carrier have the same carrier bandwidth, if the terminal accesses the LTE base station (e.g., eNB) first, the terminal needs to transmit with one TA when transmitting data to the LTE base station on the carrier, and at this time, if the terminal needs to access the NR base station (e.g., gNB), the terminal needs to transmit a preamble to the NR base station, and the TA default used when transmitting the preamble is 0. PRACH resources for transmitting preambles may be configured for NUL carrier and/or SUL carrier transmission when both are present. The terminal may determine on which carrier the preamble is transmitted by the signal quality of the carrier. For non-contention random access, the access network device (LTE base station or NR base station) may designate the carrier on which the preamble is transmitted (e.g., by one cell (e.g., PDCCH order) in the physical downlink control channel (physical downlink control channel, PDCCH)) or a radio resource control (radio resource control, RRC) reconfiguration message (dedicated RRC RACH configuration) to the terminal. If the terminal transmits the preamble (whether the terminal determines itself or the access network device designates) on the SUL carrier, it may cause overlapping of time domain resources occupied by the terminal transmitting the preamble to the NR base station and time domain resources occupied by the terminal transmitting the data to the LTE base station, so that the preamble and the data interfere with each other.

As can be seen from the preamble formats defined in table one and table two, the length of the preamble can be up to 12 symbols. In this case, referring to fig. 5, after the terminal accesses the LTE base station, the TA used in transmitting data is 4 symbols, if the terminal transmits the preamble to the NR base station in the time slot n+1, and the terminal starts to transmit data in the symbol 0 of the time slot n+2, the time domain resource occupied by transmitting the preamble to the NR base station overlaps with the time domain resource occupied by transmitting the data to the LTE base station (the overlapping portion is the symbol 10 and the symbol 11 in the time slot n+1 on the SUL carrier, or the symbol 0 and the symbol 1 in the time slot n+2 on the LTE carrier), so that the preamble and the data interfere.

In this case, according to the above-mentioned processing of the uplink transmission timing deviation, referring to fig. 6, the SUL carrier may be avoided, and at this time, the preamble on the symbol 11 is not transmitted from the symbol 9 in the time slot n+1 on the SUL carrier, which may result in incomplete preamble transmission and performance loss of the signaling channel.

To this end, the embodiments of the present application provide two solutions to this problem, which are described below by way of example one and example two, respectively. Both the first and second embodiments may be applied to a communication system including a first access network device and a second access network device, where the network formats of the first access network device and the second access network device are different, and there is an overlap (both a partial overlap and a full overlap) between a frequency band (denoted as a first frequency band) in which a terminal communicates with the first access network device and a frequency band (denoted as a second frequency band) in which the terminal communicates with the second access network device, for example, the terminal communicates with the first access network device and the second access network device through the same uplink carrier (denoted as a first carrier), that is, the terminal shares the first carrier when communicating with the first access network device and the second access network device. The first access network equipment is an LTE base station, the second access network equipment is an NR base station, or the first access network equipment is an NR base station, and the second access network equipment is an LTE base station. Wherein, when the terminal communicates with the LTE base station through the first carrier, the first carrier may be referred to as an LTE carrier, and when the terminal communicates with the NR base station through the first carrier, the first carrier may be referred to as a SUL carrier. The terminal accesses the first access network device (i.e. establishes an RRC connection with the first access network device) but does not access the second access network device through a random access procedure.

In the first embodiment, the terminal sends the preamble to the second access network device in advance, so that the overlapping part of the time domain resource occupied by the preamble and the time domain resource occupied when the data is sent to the first access network device is reduced. In the second embodiment, the terminal delays sending data to the first access network device so that the overlapping part of the time domain resource occupied by the terminal when sending the preamble to the second access network device and the time domain resource occupied by the data is reduced.

Example 1

An embodiment provides a communication method, as shown in fig. 7, including:

701. and the terminal establishes RRC connection with the first access network equipment in the first frequency band.

In a specific implementation, the terminal may establish an RRC connection with the first access network device in the first frequency band through a random access procedure in step 701.

702. When time domain resources occupied by data to be sent to the first access network device and time domain resources occupied by a preamble to be sent to the second access network device overlap, the terminal determines a first TA adopted when the preamble is sent to the second access network device.

The first TA is greater than 0, so that the overlapping portion between the time domain resource occupied by the data to be sent to the first access network device and the time domain resource occupied by the preamble to be sent to the second access network device is reduced.

703. And the terminal adopts the first TA to send the preamble to the second access network equipment in the second frequency band. Correspondingly, the second access network device receives the preamble, and the action after receiving the preamble can refer to the existing flow, which is not described again.

Optionally, the first TA is related to any one or more of the following parameters 1 to 4.

Parameter 1, length of preamble. Specifically, the longer the preamble, the larger the first TA. Under the condition of fixed other parameters, the longer the preamble is, the more the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

Parameter 2, index of the start symbol of the preamble. Specifically, the larger the index of the start symbol of the preamble, the larger the first TA. Under the condition that other parameters are fixed, because the larger the index of the initial symbol of the preamble is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

And parameters 3 and a second TA, wherein the second TA is adopted when the terminal transmits data. Specifically, the larger the second TA, the larger the first TA. Under the condition that other parameters are fixed, as the second TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap more, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

Parameter 4, uplink transmission timing deviation between the first access network device and the second access network device. Specifically, the larger the uplink transmission timing deviation, the larger the first TA. Under the condition that other parameters are fixed, the larger the uplink transmission timing deviation is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data are overlapped, and at the moment, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from being overlapped too much.

In the method provided by the embodiment of the application, under the condition that the first frequency band and the second frequency band are overlapped, if the time domain resources occupied by the preamble and the time domain resources occupied by the data are overlapped, the terminal can send the preamble to the second access network equipment by adopting the first TA with the value larger than 0, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data are prevented from being overlapped too much, interference is avoided, and the success rate of network access is improved. Optionally, referring to fig. 7, before step 702, the method further includes:

701A, the terminal determines whether time domain resources occupied by data to be transmitted to the first access network device and time domain resources occupied by a preamble to be transmitted to the second access network device overlap.

In a specific implementation, after knowing the preamble information, the terminal can determine on which symbols the preamble is transmitted (i.e. determine the time domain resources occupied by the preamble). The preamble information includes start symbol information of a terminal transmitting a preamble and length information of the preamble. Wherein the length of the preamble may be determined according to the preamble format. The start symbol information of the preamble may be determined according to the preamble transmitted by the terminal determination. Specifically, the second access network device may broadcast a preamble format to the terminal through a master information block (master information block, MIB) or a system information block (system information block, SIB), and after the terminal determines the preamble format, randomly select one preamble from preambles corresponding to the preamble format, and select a nearby transmission symbol from transmission symbols corresponding to the preamble to transmit the preamble. The terminal may determine that the nearby transmission symbol is a start symbol of the preamble, and determine that the length of the preamble format is the length of the preamble.

In addition, the terminal may determine which symbols of a slot to transmit data on according to parameters related to time domain resources of the transmitted data carried in MIB or SIB broadcast by the first access network device. That is, information for determining time domain resources of data may be carried in MIB or SIB.

If the result of the step 701A is yes, the terminal determines the first TA adopted when sending the preamble to the second access network device, and if the result of the step 701A is no, the terminal normally sends the preamble and the data. In fig. 7, the determination result of step 701A is taken as an example to draw.

Optionally, the method further comprises: the first access network device sends a message to the terminal, the message including information for determining the second TA. Correspondingly, the terminal receives the message from the first access network device. In this case, step 701A may include, when embodied:

11 And the terminal determines a first TA adopted when transmitting the preamble to the second access network equipment according to the preamble information and the second TA.

Alternatively, in a case where the information for determining the second TA is the value of the second TA, the value of the second TA is carried in Msg2, the terminal may directly determine the second TA. In another case, the information for determining the second TA is an offset value for updating the second TA, in which case the terminal determines the second TA according to the offset value.

In actual implementation, there may be two modules (denoted as a first module and a second module) inside the terminal, where one module (denoted as a first module) is used to communicate with the first access network device, and the other module (denoted as a second module) is used to communicate with the second access network device, and in general, the two modules do not interact with each other. In the embodiment of the present application, however, the second module may request the information of the second TA from the first module, and the first module sends the information of the second TA to the second module, so that the second module determines the first TA.

Optionally, step 11) includes, when specifically implemented:

21 The terminal determines the first TA according to the preamble information, the second TA and uplink transmission timing deviation between the first access network device and the second access network device.

Optionally, if the overlapping portion between the data and the time domain resources occupied by the preamble is reduced, the first TA is greater than 0. The first TA is denoted as TA _{nr_Preamble} Further optionally, TA _{nr_Preamble} ≤TA _Lte 。

Optionally, if the time domain resources occupied by the data and the preamble are not overlapped, the first TA satisfies the following condition: MAX (0, TA) _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte 。

Wherein TA _{nr_Preamble} For the first TA, MAX is the maximum function, TA _Lte For the second TA, T _{t_max} For uplink transmission timing offset between a first access network device and a second access network device, DIS _Preamble And transmitting the end time of the preamble to a period from the end time of the time slot to the end of the time slot for the terminal, wherein the time slot is the time slot to which the end time belongs.

Specifically, referring to fig. 8, taking an example that a terminal communicates with a first access network device and a second access network device through a first carrier, the end time of sending a preamble is denoted as x, and in order to ensure that time domain resources occupied by the preamble and data do not overlap, consider T _{t_max} It is necessary to ensure x-T _{t_max} Before y, i.e. x-T _{t_max} Y is less than or equal to y, if the length of one time slot is recorded as T _slot X=t _slot -DIS _Preamble -TA _{nr_Preamble} ，y＝T _slot -TA _Lte That is, T _slot -DIS _Preamble -TA _{nr_Preamble} -T _{t_max} ≤T _slot -TA _Lte Then TA _Lte -DIS _Preamble -T _{t_max} ≤TA _{nr_Preamble} . In addition, TA _{nr_Preamble} Generally less than or equal to TA _Lte then-TA _Lte ≤-TA _{nr_Preamble} I.e. TA _{nr_Preamble} ≤TA _Lte . Wherein TA _Lte -DIS _Preamble -T _{t_max} May be less than 0, and TA _{nr_Preamble} Is greater than 0, thus TA _{nr_Preamble} The following conditions should be satisfied: MAX (0, TA) _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte 。

For example, referring to fig. 9, taking an example that a terminal communicates with a first access network device and a second access network device through a first carrier, if the TA _Lte For 4 symbols, DIS _Preamble For 2 symbols, then when T _2*OFDM -T _{t_max} ＜TA _{nr_Preamble} ≤T _4*oFDM When, for example, TA is 3 symbols, the preamble and the time domain resource occupied by the dataThe sources do not overlap. Wherein T is _2*OFDM Refers to the length of 2 symbols, T _4*OFDM Refers to a length of 4 symbols.

Optionally, the method further comprises:

31 The terminal receives a third TA from the second access network device, wherein the third TA is calculated by the second access network device for the terminal according to the preamble.

32 The terminal updates the first TA to a fourth TA, and sends a message 3 to the second access network device by adopting the fourth TA, wherein the fourth TA is the sum of the first TA and the third TA.

After the terminal sends the preamble to the second access network device, the second access network device may send a third TA (which may be referred to as TA _nr ) For the terminal, since the third TA is measured based on the preamble and the preamble is sent based on the first TA, the actual TA between the terminal and the second access network device should be the sum of the first TA and the third TA (i.e. the fourth TA), and the terminal sends the message 3 to the second access network device using the fourth TA.

In the case that the terminal includes the first module and the second module described above, a specific flow of the method provided in the first embodiment is described below as an example by fig. 10. Referring to fig. 10, the process includes:

1001. the first module accesses the first access network equipment, and the second module initiates a random access flow to the second access network equipment.

1002. The second module determines the preamble information.

1003. The second module sends a request message to the first module, the request message being for requesting information of the second TA.

1004. The first module receives the request message from the second module and sends the information of the second TA to the second module according to the request message.

1005. The second module receives information of the second TA and determines the first TA according to the second TA and the preamble information.

1006. The second module sends the preamble to the second access network device according to the first TA.

1007. The second module receives information of a third TA from the second access network device.

1008. The second module calculates a fourth TA according to the first TA and the third TA, and sends a message 3 to the second access network device according to the fourth TA.

Example two

The second embodiment provides a communication method, as shown in fig. 11, including:

1101. and the terminal establishes RRC connection with the first access network equipment in the first frequency band.

In this embodiment, in step 1101, the terminal may establish an RRC connection with the first access network device in the first frequency band through a random access procedure.

1102. And the terminal adopts a first TA to send a preamble to the second access network equipment in the second frequency band, and the value of the first TA is 0. Correspondingly, the second access network device receives the preamble, and the action after receiving the preamble can refer to the existing flow, which is not described again.

The TA adopted when the terminal sends the preamble is the first TA with the value of 0. That is, the terminal normally transmits the preamble to the second access network device.

1103. And when the time domain resources occupied by the data to be sent to the first access network equipment and the time domain resources occupied by the preamble overlap, the terminal delays sending the data to the first access network equipment.

In the method provided by the embodiment of the application, under the condition that the first frequency band and the second frequency band are overlapped, if the terminal determines that the time domain resources occupied by the preamble transmitted to the second access network equipment are overlapped with the time domain resources occupied by the data to be transmitted to the first access network equipment, the terminal delays transmitting the data to the first access network equipment, so that the time domain resources occupied by the preamble and the time domain resources occupied by the data are prevented from being overlapped too much, interference is avoided, and the network access success rate is improved.

Optionally, referring to fig. 11, before step 1103, the method further includes:

1102A, the terminal determines whether time domain resources occupied by data to be sent to the first access network device and time domain resources occupied by a preamble to be sent to the second access network device overlap.

After learning the preamble information, the terminal may determine on which symbols the preamble is transmitted (i.e., determine the time domain resources occupied by the preamble). The preamble information includes start symbol information of a terminal transmitting a preamble and length information of the preamble. Wherein the length of the preamble may be determined according to the preamble format. The start symbol information of the preamble may be determined according to the preamble transmitted by the terminal determination. Specifically, the second access network device may broadcast a preamble format to the terminal through the MIB or SIB, after the terminal determines the preamble format, randomly select one preamble from preambles corresponding to the preamble format, and select a nearby transmission symbol from transmission symbols corresponding to the preamble to transmit the preamble. The terminal may determine that the nearby transmission symbol is a start symbol of the preamble, and determine that the length of the preamble format is the length of the preamble.

If the judgment result of the step 1102A is yes, the terminal delays sending data to the first access network device, and if the judgment result of the step 1102A is no, the terminal normally sends data.

In actual implementation, there may be two modules (denoted as a first module and a second module) inside the terminal, where one module (denoted as a first module) is used to communicate with the first access network device, and the other module (denoted as a second module) is used to communicate with the second access network device, and in general, the two modules do not interact with each other. However, in the embodiment of the present application, the second module may send the preamble information to the first module, so that the first module determines whether the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, and further determines whether to delay sending the data.

Optionally, the method further comprises: the first access network device sends a message to the terminal, the message including information for determining the second TA. Accordingly, the terminal receives the message from the first access network device.

In this case, step 1102A, when specifically implemented, includes:

11 And the terminal determines whether the time domain resources occupied by the data to be sent to the first access network equipment and the time domain resources occupied by the preamble to be sent to the second access network equipment overlap or not according to the preamble information and the second TA.

The second TA is the TA adopted when the terminal sends the data. Illustratively, the TA may range from 0ms to 2ms.

Optionally, step 11) includes, when specifically implemented:

21 And the terminal determines whether the time domain resources occupied by the data to be sent to the first access network device and the time domain resources occupied by the preamble to be sent to the second access network device overlap or not according to the preamble information, the second TA and the uplink transmission timing deviation between the first access network device and the second access network device.

Optionally, when the preamble information and the second TA meet the first condition and the second condition, the time domain resource occupied by the preamble overlaps the time domain resource occupied by the data.

The first condition is: the time slot of the time domain resource occupied by the lead code and the time slot of the time domain resource occupied by the data are the time slots with adjacent numbers. For example, the time slot to which the time domain resource occupied by the preamble belongs is time slot N, and the time slot to which the time domain resource occupied by the data belongs is time slot n+1.

The second condition is: LEN (LEN) _{sul_Preamble} ＞(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} . Wherein LEN is as follows _{sul_Preamble} For the length of the preamble, mu corresponds to the SCS employed by the terminal in communication with the second access network device,N _{s_sul} transmitting index, TA, of start symbol of preamble for terminal _Lte For the second TA, T _{t_max} And the timing deviation is used for uplink transmission between the first access network equipment and the second access network equipment.

Wherein scs=15 KHz, μ=0; scs=30 KHz, μ=1; scs=60 KHz, μ=2, scs=120 KHz, μ=3. T (T) _{t_max} ＝5.21us。1000/2 ^μ For a slot length, 1000/(14×2) ^μ ) Is one symbol in length.

It will be appreciated that assume N _{s_sul} ＝2，TA _Lte 4 symbols, LEN _{sul_preamble} With 6 symbols, see fig. 12, it will be appreciated that if (1000/2 ^μ )-TA _Lte ＜(1000/(14*2 ^μ ))*N _{s_sul} +LEN _{sul_Preamble} +T _{t_max} I.e. LEN _{sul_Preamble} ＞(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} When the time domain resources occupied by the data and the lead code overlap, otherwise, the time domain resources occupied by the data and the lead code do not overlap.

Optionally, the terminal delays sending data to the first access network device, including: the terminal delays sending data to the first access network device for a first period of time, the first period of time being greater than 0. The alternative method can reduce the overlapping part between the data and the time domain resources occupied by the lead code.

Optionally, the first time period is related to any one or more of the following parameters 1 to 4.

Parameter 1, length of preamble. Specifically, the longer the preamble, the longer the first period of time. Under the condition of fixed other parameters, the longer the preamble is, the more the time domain resources occupied by the preamble overlap with the time domain resources occupied by the data, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

Parameter 2, index of the start symbol of the preamble. Specifically, the larger the index of the start symbol of the preamble, the longer the first period of time. Under the condition that other parameters are fixed, because the larger the index of the initial symbol of the preamble is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

Parameter 3, second TA. Specifically, the larger the second TA, the longer the first period of time. Under the condition that other parameters are fixed, as the second TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data overlap more, and at this time, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from overlapping too much.

Parameter 4, uplink transmission timing deviation between the first access network device and the second access network device. Specifically, the larger the uplink transmission timing deviation is, the longer the first period of time is. Under the condition that other parameters are fixed, the larger the uplink transmission timing deviation is, the more the time domain resources occupied by the preamble and the time domain resources occupied by the data are overlapped, and at the moment, if the first TA is larger, the time domain resources occupied by the preamble and the time domain resources occupied by the data can be better prevented from being overlapped too much.

Optionally, if the time domain resources occupied by the data and the preamble are not overlapped, the first time period is greater than or equal to the second time period, where the second time period is: LEN (LEN) _{sul_Preamble} -[(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ]The unit of the second period is us.

The method provided by the first embodiment described above is exemplified by examples 1 and 2 below.

Example 1

Referring to fig. 12, taking an example of a terminal communicating with a first access network device and a second access network device via a first carrier, (1000/2) ^μ )-TA _Lte ＞(1000/(14*2 ^μ ))*N _{s_sul} +LEN _{sul_Preamble} +T _{t_max} Therefore, the time domain resources occupied by the data and the preamble do not overlap, and at this time, the terminal normally transmits the data to the first access network device.

Example 2

Referring to fig. 13, taking the example that the terminal communicates with the first access network device and the second access network device through the first carrier, assume N _{s_sul} ＝2，TA _Lte 4 symbols, LEN _{sul_preamble} 10 symbols, at this time, (1000/2) ^μ )-TA _Lte ＜(1000/(14*2 ^μ ))*N _{s_sul} +LEN _{sul_Preamble} +T _{t_max} Overlapping of time domain resources occupied by the data and the preamble occurs, and delay { LEN when the terminal transmits the data to the first access network device _{sul_Preamble} -[(1000/2 ^μ )-(1000/(14*2 ^μ ))*N _{s_sul} -TA _Lte -T _{t_max} ]}us。

In the case that the terminal includes the first module and the second module described above, a specific flow of the method provided in the first embodiment is described below as an example by fig. 14. Referring to fig. 14, the process includes:

1401. the first module accesses the first access network equipment, and the second module initiates a random access flow to the second access network equipment.

1402. The second module determines the preamble information.

1403. The second module sends the preamble information to the first module.

1404. The first module receives the preamble information and determines whether time domain resources occupied by the data and the preamble overlap according to the preamble information and the second TA.

If yes, go to step 1405, if no, go to step 1406.

1405. The first module delays sending data to the first access network device or the first module determines not to send data to the first access network device.

1406. The first module normally transmits data to the first access network device.

In the second embodiment, an alternative implementation of "the terminal delays sending data to the first access network device" is "the terminal determines not to send data to the first access network device". Under the condition that the first frequency band and the second frequency band are overlapped, if the time domain resources occupied by the lead code and the time domain resources occupied by the data are overlapped, the terminal does not send the data to the first access network equipment, so that the time domain resources occupied by the lead code and the time domain resources occupied by the data are prevented from being overlapped, interference is avoided, and the success rate of network access is improved.

For convenience of description, the method provided by the embodiment of the present application is exemplified by the NR system and the LTE system, but it should be noted that the method provided by the embodiment of the present application may be applied to other systems having similar scenarios. Such as NR systems and future evolution systems, or LTE systems and future evolution systems. In this case, the first access network device and the second access network device may be replaced with access network devices in the corresponding systems, and other parameters (for example, uplink transmission timing deviation) may be replaced with values in the corresponding systems.

In addition, in the embodiment of the present application, an access network device is taken as a base station for example for illustration, and in actual implementation, the access network device may be a transmission receiving point (transmission reception point, TRP), a Relay Node (RN), an access backhaul integrated (integrated access and backhaul, IAB) node, an Access Point (AP), various types of control nodes (e.g., a network controller, a wireless controller (e.g., a wireless controller in a cloud wireless access network (cloud radio access network, CRAN) scenario), a Road Side Unit (RSU), and so on.

A terminal in an embodiment of the present application may also be referred to as a User Equipment (UE), a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal may be a vehicle networking (vehicle to everything, V2X) device, such as a smart car (smart car or intelligent car), a digital car (digital car), an unmanned car (unmanned car or driverless car or pilotless car or automatic), an automatic car (self-driving car or automatic car), a pure electric car (pure EV or Battery EV), a hybrid car (hybrid electric vehicle, HEV), an extended electric car (REEV), a plug-in hybrid car (PHEV), a new energy car (new energy vehicle), etc. The terminal may also be a device-to-device (D2D) device, such as an electricity meter, water meter, or the like. The terminal may also be a Mobile Station (MS), a subscriber unit (subscriber unit), an unmanned aerial vehicle, an internet of things (internet of things, ioT) device, a Station (ST) in a WLAN, a cellular phone (cellular phone), a smart phone (smart phone), a cordless phone, a wireless data card, a tablet, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital processing (personal digital assistant, PDA) device, a laptop (captop computer), a machine type communication (machine type communication, MTC) terminal, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device (which may also be referred to as a wearable smart device). The terminal may also be a terminal in a next generation communication system.

The foregoing description of the embodiments of the present application has been presented primarily in terms of methods. It will be appreciated that each network element, e.g. a terminal, in order to implement the above-mentioned functions, comprises at least one of a corresponding hardware structure and software module for performing each function. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional units of the terminal according to the method example, for example, each functional unit can be divided corresponding to each function, and two or more functions can be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.

By way of example, fig. 15 shows a schematic diagram of one possible configuration of a communication apparatus (denoted as a communication apparatus 150) involved in the above-described embodiment, the communication apparatus 150 including a processing unit 1501 and a communication unit 1502. Optionally, a storage unit 1503 is also included. The communication device 150 may be used to illustrate the structure of the terminal in the above-described embodiment.

Specifically, the processing unit 1501 is configured to control and manage actions of the terminal, for example, the processing unit 1501 is configured to perform actions performed by the terminal in the steps of fig. 7, fig. 10, fig. 11, fig. 14, and/or other processes described in the embodiments of the present application. The processing unit 1501 may communicate with other network entities, for example, with the second access network device in fig. 7, through the communication unit 1502. The storage unit 1503 is used to store program codes and data of the terminal.

The communication device 150 may be a device or a chip or a system-on-chip, for example.

When the communication apparatus 150 is one device, the processing unit 1501 may be a processor; the communication unit 1502 may be a communication interface, a transceiver, or an input interface and/or an output interface. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input interface may be an input circuit and the output interface may be an output circuit.

When the communication device 150 is a chip or a system-on-chip, the communication unit 1502 may be a communication interface, an input interface and/or an output interface, an interface circuit, an output circuit, an input circuit, pins, or related circuits, etc. on the chip or system-on-chip. The processing unit 1501 may be a processor, a processing circuit, a logic circuit, or the like.

The integrated units of fig. 15 may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand alone product. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. The storage medium storing the computer software product includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The embodiment of the present application further provides a schematic hardware structure of a communication device, referring to fig. 16 or 17, where the communication device includes a processor 1601, and optionally, a memory 1602 connected to the processor 1601.

The processor 1601 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. The processor 1601 may also include multiple CPUs, and the processor 1601 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

Memory 1602 may be a ROM or other type of static storage device, a RAM or other type of dynamic storage device that can store static information and instructions, or that can store information and instructions, or that can be an electrically erasable programmable read-only memory (EEPROM), a CD-ROM or other optical disk storage, a compact disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the application are not limited in this regard. The memory 1602 may be separate (in which case the processor may be located outside the communication device or within the communication device) or may be integral with the processor 1601. Wherein the memory 1602 may include computer program code. The processor 1601 is configured to execute computer program code stored in the memory 1602, thereby implementing the method provided by the embodiment of the present application.

In a first possible implementation, see fig. 16, the communication device further comprises a transceiver 1603. The processor 1601, memory 1602 and transceiver 1603 are connected by a bus. The transceiver 1603 is used to communicate with other devices or communication networks. Optionally, the transceiver 1603 may include a transmitter and a receiver. The means for implementing the receiving function in the transceiver 1603 may be regarded as a receiver for performing the steps of receiving in embodiments of the present application. The means for implementing the transmit function in transceiver 1603 may be considered a transmitter for performing the transmit steps in embodiments of the present application.

Based on a first possible implementation, the structural diagram shown in fig. 16 may be used to illustrate the structure of the terminal involved in the above-described embodiment. Specifically, the processor 1601 is configured to control and manage actions of the terminal, for example, the processor 1601 is configured to perform actions performed by the terminal in the steps of fig. 7, fig. 10, fig. 11, fig. 14, and/or other processes described in embodiments of the present application. The processor 1601 may communicate with other network entities, e.g., with the second access network device in fig. 7, through a transceiver 1603. The memory 1602 is used to store program codes and data for the terminal.

In a second possible implementation, the processor 1601 includes logic and at least one of an input interface and an output interface. The output interface is for performing the actions of the sending in the respective method, and the input interface is for performing the actions of the receiving in the respective method.

Based on a second possible implementation, referring to fig. 17, the structural diagram shown in fig. 17 may be used to illustrate the structure of the terminal involved in the above-described embodiment. Specifically, the processor 1601 is configured to control and manage actions of the terminal, for example, the processor 1601 is configured to perform actions performed by the terminal in the steps of fig. 7, fig. 10, fig. 11, fig. 14, and/or other processes described in embodiments of the present application. The processor 1601 may communicate with other network entities, e.g., with the second access network device in fig. 7, through at least one of an input interface and an output interface. The memory 1602 is used to store program codes and data for the terminal.

In implementation, each step in the method provided in the present embodiment may be implemented by an integrated logic circuit of hardware in a processor or an instruction in a software form. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution.

In addition, the embodiment of the application also provides a schematic hardware structure of the terminal (denoted as a terminal 180), and particularly, reference may be made to fig. 18.

Fig. 18 is a schematic diagram of a hardware structure of the terminal 180. For convenience of explanation, fig. 18 shows only main components of the terminal. As shown in fig. 18, the terminal 180 includes a processor, a memory, a control circuit, an antenna, and an input-output device.

The processor is mainly configured to process the communication protocol and the communication data, and control the entire terminal, execute a software program, process data of the software program, for example, control the terminal to perform some or all of the steps in fig. 7, the steps in fig. 10, the steps in fig. 11, the steps in fig. 14, and the actions performed by the terminal in other processes described in the embodiments of the present application. The memory is mainly used for storing software programs and data. The control circuit (may also be referred to as a radio frequency circuit) is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The control circuit together with the antenna, which may also be called a transceiver, is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user.

When the terminal is started, the processor can read the software program in the memory, interpret and execute the instructions of the software program, and process the data of the software program. When data (for example, a preamble) needs to be transmitted through an antenna, the processor performs baseband processing on the data to be transmitted, and then outputs a baseband signal to a control circuit in the control circuit, and the control circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the control circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that fig. 18 shows only one memory and processor for ease of illustration. In an actual terminal, there may be multiple processors and memories. The memory may also be referred to as a storage medium or storage device, etc., and embodiments of the present application are not limited in this respect.

As an alternative implementation manner, the processor may include a baseband processor, which is mainly used to process the communication protocol and the communication data, and a central processor, which is mainly used to control the whole terminal, execute a software program, and process the data of the software program. The processor in fig. 18 integrates the functions of a baseband processor and a central processing unit, and those skilled in the art will appreciate that the baseband processor and the central processing unit may be separate processors, interconnected by bus technology, etc. Those skilled in the art will appreciate that a terminal may include multiple baseband processors to accommodate different network formats, and that a terminal may include multiple central processors to enhance its processing capabilities, with various components of the terminal being connectable via various buses. The baseband processor may also be referred to as a baseband processing circuit or baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in a memory in the form of a software program, which is executed by the processor to realize the baseband processing function.

Embodiments of the present application also provide a computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform any of the methods described above.

Embodiments of the present application also provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform any of the methods described above.

The embodiment of the application also provides a communication system, which comprises: an access network device and a terminal in the above embodiments. Optionally, the access network device includes the first access network device and/or the second access network device.

The embodiment of the application also provides a chip, which comprises: a processor and an interface through which the processor is coupled to the memory, which when executed by the processor causes the processor to perform any of the methods provided by the embodiments described above.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, a website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method of communication, comprising:

the terminal establishes Radio Resource Control (RRC) connection with first access network equipment in a first frequency band;

when time domain resources occupied by data to be sent to the first access network device and time domain resources occupied by a lead code to be sent to the second access network device overlap, the terminal determines a first time advance TA adopted when the lead code is sent to the second access network device, and network systems of the first access network device and the second access network device are different;

the terminal sends the lead code to the second access network equipment by adopting the first TA in a second frequency band, so that the time domain resources occupied by the data and the lead code are not overlapped; wherein an overlap exists between the first frequency band and the second frequency band;

the first TA satisfies the following condition:

MAX(0,TA _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte ；

wherein TA _{nr_Preamble} For the first TA, MAX is a maximum function, TA _Lte A second TA, T used when transmitting the data for the terminal _{t_max} For the uplink transmission timing offset between the first access network device and the second access network device, DIS _Preamble And transmitting the end time of the preamble to a period from the end time of the time slot to the end of the time slot for the terminal, wherein the time slot is the time slot to which the end time belongs.

2. The method of claim 1, wherein the first TA is related to a length of the preamble, the longer the preamble, the larger the first TA.

3. The method according to claim 1 or 2, wherein the first TA is related to an index of a start symbol of the preamble, the larger the index of the start symbol of the preamble, the larger the first TA.

4. A method according to claim 1 or 2, characterized in that the length of the preamble is determined according to a preamble format.

5. The method of claim 4, wherein the information indicating the preamble format is carried in a master information block MIB or a system information block SIB.

6. The method according to any of claims 1, 2 or 5, wherein the first TA is related to a second TA, the larger the first TA, the second TA being the TA employed by the terminal when transmitting the data.

7. The method of claim 6, wherein the method further comprises:

the terminal receives a message from the first access network device, wherein the message comprises information for determining the second TA.

8. The method of claim 7, wherein the information for determining the second TA is a value of the second TA, the value of the second TA being carried in message 2; or, the information for determining the second TA is an offset value for updating the second TA.

9. The method of any of claims 1, 2, 5, 7, or 8, wherein the first TA is related to an uplink timing offset between the first access network device and the second access network device, the larger the uplink timing offset, the larger the first TA.

10. The method of any one of claims 1, 2, 5, 7, or 8, further comprising:

the terminal receives a third TA from the second access network device, wherein the third TA is TA calculated by the second access network device for the terminal according to the preamble;

and the terminal updates the first TA to a fourth TA, and sends a message 3 to the second access network equipment by adopting the fourth TA, wherein the fourth TA is the sum of the first TA and the third TA.

11. The method of any of claims 1, 2, 5, 7 or 8, wherein the information for determining the time domain resources of the data is carried in a MIB or SIB.

12. The method according to any of claims 1, 2, 5, 7 or 8, wherein the first access network device is an access network device in a long term evolution, LTE, system and the second access network device is an access network device in a new wireless, NR, system.

13. A communication device, comprising: a processing unit and a communication unit;

the processing unit is configured to establish radio resource control RRC connection with the first access network device in the first frequency band through the communication unit;

when the time domain resources occupied by the data to be sent to the first access network device and the time domain resources occupied by the preamble to be sent to the second access network device overlap, the processing unit is further configured to determine a first time advance TA adopted when sending the preamble to the second access network device, where network systems of the first access network device and the second access network device are different;

the processing unit is further configured to send, in a second frequency band, the preamble to the second access network device through the communication unit by using the first TA, so that time domain resources occupied by the data and the preamble are not overlapped; wherein an overlap exists between the first frequency band and the second frequency band;

The first TA satisfies the following condition:

MAX(0,TA _Lte -T _{t_max} -DIS _Preamble )＜TA _{nr_Preamble} ≤TA _Lte ；

wherein TA _{nr_Preamble} For the first TA, MAX is a maximum function, TA _Lte Transmitting for the communication deviceSecond TA, T employed in transmitting the data _{t_max} For the uplink transmission timing offset between the first access network device and the second access network device, DIS _Preamble And sending a period from the end time of the preamble to the end of a time slot to the communication device, wherein the time slot is the time slot to which the end time belongs.

14. The communications apparatus of claim 13, wherein the first TA is related to a length of the preamble, the longer the preamble, the larger the first TA.

15. The communication apparatus according to claim 13 or 14, wherein the first TA is related to an index of a start symbol of the preamble, the larger the index of the start symbol of the preamble, the larger the first TA.

16. The communication apparatus according to claim 13 or 14, wherein the length of the preamble is determined according to a preamble format.

17. The communication apparatus of claim 16, wherein the information indicating the preamble format is carried in a master information block MIB or a system information block SIB.

18. The communication apparatus according to claim 13, 14 or 17, wherein the first TA is related to a second TA, the larger the second TA is, the larger the first TA is, the second TA is the TA employed by the communication apparatus when transmitting the data.

19. The communication device of claim 18, wherein the communication device is configured to,

the processing unit is further configured to receive, through the communication unit, a message from the first access network device, where the message includes information for determining the second TA.

20. The communication apparatus according to claim 19, wherein the information for determining the second TA is a value of the second TA, the value of the second TA being carried in message 2; or, the information for determining the second TA is an offset value for updating the second TA.

21. The communication apparatus according to any of claims 13, 14, 17, 19 or 20, wherein the first TA is related to an uplink transmission timing offset between the first access network device and the second access network device, the larger the uplink transmission timing offset, the larger the first TA.

22. The communication device according to any one of claims 13, 14, 17, 19 or 20, wherein:

The processing unit is further configured to receive, by using the communication unit, a third TA from the second access network device, where the third TA is a TA calculated by the second access network device for the communication device according to the preamble;

the processing unit is further configured to update the first TA to a fourth TA, and send a message 3 to the second access network device through the communication unit by using the fourth TA, where the fourth TA is a sum of the first TA and the third TA.

23. The communication apparatus according to any of claims 13, 14, 17, 19 or 20, wherein the information for determining the time domain resources of the data is carried in a MIB or SIB.

24. The communication apparatus according to any of claims 13, 14, 17, 19 or 20, wherein the first access network device is an access network device in a long term evolution, LTE, system and the second access network device is an access network device in a new wireless, NR, system.

25. A communication device, comprising: a processor;

the processor is connected to a memory for storing computer-executable instructions that the processor executes to cause the communication device to implement the method of any one of claims 1-12.

26. A chip, comprising: a processor and an interface through which the processor is coupled to a memory, which when executed by the processor causes the method of any of claims 1-12 to be performed.

27. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of any of claims 1-12.

28. A communication system, comprising: access network device and terminal performing the method of any of the preceding claims 1-12.