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公开(公告)号：EP4030857A1
公开(公告)日：2022-07-20
申请号：EP20871769.4
申请日：2020-09-15
发明人： WANG, Xiaolu , LUO, Hejia , LI, Rong , WANG, Bin , WANG, Jun
IPC分类号： H04W74/08
摘要： Embodiments of this application provide a timing advance indication method, a communication apparatus, and a storage medium. The method includes: A first device determines a quantity of extended bits and a location of the extended bit of a timing advance TA instruction based on a subcarrier spacing of a second device, and the first device sends the TA instruction to the second device, where the TA instruction includes the extended bit, and a quantity of bits of the TA instruction is greater than 12. The first device determines the quantity of extended bits and the location of the extended bit of the timing advance TA instruction based on the subcarrier spacing of the second device, and uses a first part, namely, the extended bit, and an existing second part to form the TA instruction, so that the TA instruction is extended. Compared with a TA value that can be indicated by the existing second part, the TA instruction corresponds to a larger quantity of bits, so that a range of a TA value indicated by the TA instruction can be effectively increased, to meet a requirement of an NTN system.
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公开(公告)号：EP4030717A1
公开(公告)日：2022-07-20
申请号：EP20871544.1
申请日：2020-09-30
发明人： XU, Chenlei , ZHOU, Jianwei , LUO, Hejia , WANG, Xiaolu
IPC分类号： H04L27/26
摘要： A satellite communication method and a related device are provided. The satellite communication method includes: generating a random access preamble sequence, where the random access preamble sequence includes a cyclic prefix, a sequence part, and a guard interval; the sequence part includes a subsequence A and a subsequence B, or the sequence part includes a subsequence C, and the subsequence C is a time domain superimposed sequence of a subsequence A and a subsequence B; and the subsequence A includes at least one preamble symbol, the subsequence B includes at least one preamble symbol, the subsequence A and the subsequence B are respectively generated by using ZC sequences of different root indexes, a quantity of subsequences A is m, a quantity of subsequences B is m or m-1, and m is a positive integer; and outputting the random access preamble sequence. In solutions of embodiments of this application, a random access preamble sequence that includes a plurality of preamble symbols and that has an anti-frequency offset capability is designed, and the random access preamble sequence includes preamble symbols generated by using different ZC sequences, so that the sequence has a good anti-frequency offset capability.
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公开(公告)号：EP4024972A1
公开(公告)日：2022-07-06
申请号：EP20870353.8
申请日：2020-09-04
发明人： ZHOU, Jianwei , LUO, Hejia , XU, Chenlei , WANG, Xiaolu
IPC分类号： H04W56/00
摘要： This application provides a satellite communication method and an apparatus. The method includes: receiving, by a terminal device, first information sent by a satellite, where the first information is used to indicate a first timing change rate range; measuring and obtaining, by the terminal device, a first downlink timing change rate; determining a first uplink timing change rate based on the first downlink timing change rate and the first timing change rate range; and performing uplink communication with the satellite based on the first uplink timing change rate. The method can effectively resolve a problem of uplink timing drift and improve uplink performance.
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公开(公告)号：EP4024744A1
公开(公告)日：2022-07-06
申请号：EP20869257.4
申请日：2020-09-08
发明人： ZHOU, Jianwei , XU, Chenlei , LUO, Hejia , WANG, Xiaolu
摘要： Embodiments of this application provide a transmission method and apparatus, and relate to the communication field. The method includes: sending control signaling to a terminal device, to indicate the terminal device to send a physical uplink shared channel (PUSCH) on a first frequency band; and receiving the PUSCH sent by the terminal device on the first frequency band. The first frequency band includes at least one guard subcarrier. A quantity of the at least one guard subcarrier is determined based on a Doppler frequency shift of a beam covering the terminal device. The first frequency band is located on a frequency band corresponding to the beam. Therefore, a manner of determining a proper guard bandwidth is proposed, to reduce interference between a PUSCH and a PRACH and meet a communication requirement of a non-terrestrial communication system.
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公开(公告)号：EP4009718A1
公开(公告)日：2022-06-08
申请号：EP20852676.4
申请日：2020-05-11
发明人： XU, Chenlei , LUO, Hejia , ZHOU, Jianwei , WANG, Xiaolu
IPC分类号： H04W56/00
摘要： Embodiments of this application provide a common timing advance indication method, an apparatus, a device, and a storage medium. The method includes: A terminal receives first indication information from a network device, where the first indication information is used to indicate a common timing advance TA value in a satellite communications system; and the terminal determines the common TA value based on the first indication information, where the common TA value is used to represent a round-trip transmission delay between a reference point in a satellite coverage area and the network device. In this application, the terminal receives, from the network device, the indication information used to indicate the common timing advance TA value in the satellite communications system, and determines the common TA value based on the indication information. Because signaling overheads required by the indication information are relatively small in comparison with signaling overheads required by the common TA value, signaling overheads for indicating the common TA value by the network device are reduced.
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