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CN-122003846-A - Communication method and device

CN122003846ACN 122003846 ACN122003846 ACN 122003846ACN-122003846-A

Abstract

A communication method and apparatus can improve the sequence capacity and the sequence configuration efficiency. The method includes that network equipment sends first information to indicate P candidate maximum round trip delays and Q candidate maximum Doppler shifts, the P candidate maximum round trip delays and the Q candidate maximum Doppler shifts correspond to P multiplied by Q sequence sets, sequences in the sequence sets are cubic polynomial index sequences, cubic term coefficients and quadratic term coefficients of the cubic polynomial index sequences are associated, and P, Q is a positive integer. The terminal equipment sends a first sequence, wherein the first sequence belongs to a first sequence set in P multiplied by Q sequence sets, the first sequence set corresponds to a first maximum round trip delay and a first maximum Doppler frequency shift, the first maximum round trip delay is one of P candidate maximum round trip delays, and the first maximum Doppler frequency shift is one of Q candidate maximum Doppler frequency shifts. The network device receives the first sequence and determines the round trip delay and/or the Doppler shift of the terminal device according to the first sequence.

Inventors

  • FENG QI
  • WANG FAN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20231011

Claims (20)

  1. A method of communication, the method comprising: Receiving first information, wherein the first information indicates P candidate maximum round trip delays and Q candidate maximum Doppler shifts, the P candidate maximum round trip delays and the Q candidate maximum Doppler shifts correspond to P multiplied by Q sequence sets, sequences in the sequence sets are cubic polynomial index sequences, cubic term coefficients of the cubic polynomial index sequences are associated with quadratic term coefficients of the cubic polynomial index sequences, and P, Q is a positive integer; And transmitting a first sequence, wherein the first sequence belongs to a first sequence set in the P multiplied by Q sequence sets, the first sequence set corresponds to a first maximum round trip delay and a first maximum Doppler frequency shift, the first maximum round trip delay is one of the P candidate maximum round trip delays, and the first maximum Doppler frequency shift is one of the Q candidate maximum Doppler frequency shifts.
  2. The method of claim 1, further comprising receiving a first signal, wherein the first maximum round trip delay is related to a signal quality of the first signal.
  3. A method according to claim 1 or 2, characterized in that the first maximum doppler shift is related to the speed of movement of the terminal device.
  4. A method of communication, the method comprising: Transmitting first information, wherein the first information indicates P candidate maximum round trip delays and Q candidate maximum Doppler shifts, the P candidate maximum round trip delays and the Q candidate maximum Doppler shifts correspond to P multiplied by Q sequence sets, sequences in the sequence sets are cubic polynomial index sequences, cubic term coefficients of the cubic polynomial index sequences are associated with quadratic term coefficients of the cubic polynomial index sequences, and P, Q is a positive integer; receiving a first sequence from a terminal device, wherein the first sequence belongs to a first sequence set in the p×q sequence sets, the first sequence set corresponds to a first maximum round trip delay and a first maximum doppler shift, the first maximum round trip delay is one of the P candidate maximum round trip delays, and the first maximum doppler shift is one of the Q candidate maximum doppler shifts; And determining the round trip delay and/or Doppler shift of the terminal equipment according to the first sequence.
  5. The method according to any one of claims 1-4, wherein the low-ambiguity regions corresponding to different ones of the P x Q sets of sequences do not overlap each other and/or the low-ambiguity regions of different ones of the same set of sequences do not overlap each other.
  6. The method of any one of claims 1-5, wherein sequences in different ones of the P x Q sets of sequences do not overlap each other.
  7. The method according to any one of claims 1-6, wherein the third order polynomial exponent sequence in the sequence set corresponding to the P-th candidate maximum round trip delay Δ T,p and the Q-th candidate maximum doppler shift Δ F,q in the P x Q sequence set is expressed as: Wherein lambda is the cubic coefficient of the cubic polynomial index sequence, For the quadratic coefficient of the third order polynomial exponential sequence, For a first order coefficient of the third order polynomial exponent sequence, the sequence length N of the third order polynomial exponent sequence is a prime number P e {1,2,..p }, Q e {1,2,..q },
  8. The method of any of claims 1-7, wherein each of the P x Q sets of sequences comprises a number of sequences Ω p,q of: Where N represents the sequence length of the cubic polynomial exponent sequence, delta T,p represents the P candidate maximum round trip delay, Δ F,q represents the Q-th candidate maximum doppler shift, R represents the number of candidate cubic term coefficients, P e {1, 2..p }, Q e {1, 2..q }, operator Representing a downward rounding, the operator Σ represents accumulation.
  9. The method of claim 8 wherein the sequence set for the p-th candidate maximum round trip delay Δ T,p and the q-th candidate maximum doppler shift Δ F,q comprises Ω p,q polynomial exponent sequences s p,q (n) expressed as: Wherein the sequence length N of the cubic polynomial index sequence is a prime number, lambda r is a cubic term coefficient of the cubic polynomial index sequence, lambda r ∈{1,2,…,N-1},r∈{1,2,…,R},λ 1 ≠λ 2 ≠…≠λ R , For the quadratic coefficient of the third order polynomial exponential sequence, For the first order coefficients of the third order polynomial index sequence,
  10. The method according to any of claims 1-7, wherein the P-th candidate maximum round trip delay Δ T,p and the Q-th candidate maximum doppler shift Δ F,q in the P x Q sequence set include a sequence number Ω p,q as: Wherein N represents the sequence length of the cubic polynomial exponent sequence, R represents the number of candidate cubic term coefficients, P ε {1,2,., P }, Q ε {1,2,., Q }, operator Representing a rounding down.
  11. The method of any of claims 1-7, 10, wherein the total area of low ambiguity regions corresponding to each of the P x Q sequence sets is the same.
  12. The method according to claim 10 or 11, wherein the sequence set corresponding to the p-th candidate maximum round trip delay Δ T,p and the q-th candidate maximum doppler shift Δ F,q comprises Ω p,q polynomial exponent sequences s p,q (n) expressed as: Wherein the sequence length N of the cubic polynomial index sequence is a prime number, lambda r is a cubic term coefficient of the cubic polynomial index sequence, lambda r ∈{1,2,…,N-1},r∈{1,2,…,R},λ 1 ≠λ 2 ≠…≠λ R , For the quadratic coefficient of the third order polynomial exponential sequence, For the first order coefficients of the third order polynomial index sequence,
  13. The method according to any one of claims 1-7, wherein the cubic term coefficients corresponding to sequences in any one of the P x Q sets of sequences are the same.
  14. The method according to any of claims 1-7, 13, wherein the cubic term coefficient corresponding to a sequence in the first set of sequences is related to the first maximum round trip delay.
  15. The method according to claim 13 or 14, wherein the third order coefficients corresponding to a plurality of second sequence sets in the p×q sequence sets are the same, and the candidate maximum round trip delays corresponding to the plurality of second sequence sets are the same.
  16. The method according to any one of claims 13-15, wherein the P candidate maximum round trip delay Δ T,p in the P x Q sequence set includes a sequence number Ω p,q of: Where N represents the sequence length of the cubic polynomial exponent sequence, Δ F,q represents the Q candidate maximum doppler shift, P e {1,2,..p }, Q e {1,2,..q }, operator Representing a downward rounding, the operator Σ represents accumulation.
  17. The method according to any of claims 14-16, wherein the sequence set corresponding to the p-th candidate maximum round trip delay Δ T,p and the q-th candidate maximum doppler shift Δ F,q comprises Ω p,q polynomial exponent sequences s p,q (n) expressed as: Wherein the sequence length N of the cubic polynomial index sequence is a prime number, lambda p is a cubic term coefficient of the cubic polynomial index sequence, lambda p ∈{1,2,…,N-1},p∈{1,2,…,P},λ 1 ≠λ 2 ≠…≠λ P ,3λ p kΔ T,p is a quadratic term coefficient of the cubic polynomial index sequence, For the first order coefficients of the third order polynomial index sequence,
  18. The method of any of claims 1-7, 13, wherein a cubic term coefficient corresponding to a sequence in the first set of sequences is related to the first maximum doppler shift.
  19. The method according to claim 13 or 18, wherein the third order coefficients corresponding to a plurality of third sequence sets in the p×q sequence sets are the same, and the candidate maximum doppler shifts corresponding to the plurality of third sequence sets are the same.
  20. The method according to any one of claims 13, 18-19, wherein the Q candidate Q maximum doppler shift Δ F,q in the P x Q sequence set comprises a sequence number Ω p,q of: Wherein N represents the sequence length of the cubic polynomial exponent sequence, Δ T,p represents the P candidate maximum round trip delay, P e {1,2, P, Q e {1,2,..q }, operator Representing a downward rounding, the operator Σ represents accumulation.

Description

Communication method and device Technical Field The embodiment of the application relates to the field of communication, in particular to a communication method and device. Background In long term evolution (long term evolution, LTE) or New Radio (NR) systems, zadoff-Chu sequences (ZC sequences for short) are typically used for uplink random access. For example, the base station configures the initial ZC root sequence number, the maximum round trip delay and the maximum Doppler frequency offset by broadcasting information. The terminal equipment sequentially determines 64 sequences according to the principle of traversing the cyclic shift and traversing the root sequence number, and then selects one sequence from the 64 sequences for random access. However, in order to combat frequency offset, in a high-speed mobile scenario of a terminal, multiple root sequence numbers may be required to determine 64 sequences, so that in a case where the total number of root sequence numbers is fixed, the initial ZC root sequence numbers cannot be configured for more cells. That is, the efficiency of the sequence configuration in the above scheme is low. Disclosure of Invention The embodiment of the application provides a communication method and a communication device, which can improve the sequence capacity and the sequence configuration efficiency. In a first aspect, a communication method is provided, which may be performed by a terminal device, or a component of the terminal device, such as a processor, a chip, or a system-on-chip of the terminal device, or a logic module or software capable of implementing all or part of the functions of the terminal device. The method includes the steps of receiving first information, wherein the first information indicates P candidate maximum round trip delays and Q candidate maximum Doppler shifts, the P candidate maximum round trip delays and the Q candidate maximum Doppler shifts correspond to P multiplied by Q sequence sets, sequences in the sequence sets are cubic polynomial exponential sequences, cubic term coefficients of the cubic polynomial exponential sequences are associated with quadratic term coefficients of the cubic polynomial exponential sequences, P, Q are positive integers, and sending a first sequence, the first sequence belongs to a first sequence set in the P multiplied by Q sequence sets, the first sequence set corresponds to first maximum round trip delays and first maximum Doppler shifts, the first maximum round trip delays are one of the P candidate maximum round trip delays, and the first maximum Doppler shifts are one of the Q candidate maximum Doppler shifts. Based on the scheme, the sequences in the P multiplied by Q sequence sets are the cubic polynomial index sequences, and based on the sequence design, the sequence capacity is in direct proportion to the cube of the sequence length, and compared with the ZC sequence, the sequence capacity is improved. Furthermore, the network device may indicate at least one candidate maximum round trip delay and at least one candidate maximum doppler shift such that terminal devices at different locations and at different movement speeds within the cell may select an appropriate maximum round trip delay and maximum doppler shift to determine the set of sequences and select sequences therefrom. In the case where the total number of sequences required for random access, M (e.g., 64), is fixed, the M sequences are distributed in p×q sequence sets, i.e., the parameters that determine the M sequences include P candidate maximum round trip delays, Q candidate maximum doppler shifts, and the cubic term coefficients of the cubic polynomial exponential sequence, since the network device divides the maximum round trip delays and the maximum doppler shifts. That is, the same number of sequences can be determined by using fewer values of the cubic term coefficients, so that the use of the cubic term coefficients can be saved, the network device can configure the cubic term coefficients for more cells, and the sequence configuration efficiency is improved. In one possible design, the method further includes receiving a first signal and the first maximum round trip delay is related to a signal quality of the first signal. In one possible design, the first maximum doppler shift is related to the speed of movement of the terminal device. Based on the two possible designs, the terminal equipment can select the candidate maximum round trip delay and the candidate maximum Doppler frequency shift based on the signal quality and the moving speed of the terminal equipment, so that the configuration efficiency of the sequence is improved. In a second aspect, a communication method is provided, where the method may be performed by a network device, or may be performed by a component of the network device, for example, a processor, a chip, or a system-on-chip of the network device, or may be implemented by a logic module or software that i