Mobility reference signal allocation
First Claim
1. A method performed in a network node for allocating and transmitting at least a predetermined number of independently faded Mobility Reference Signals (MRS) for a wireless communication device to measure beam signal quality in a wireless communication network, wherein the independently faded MRS are transmitted in a MRS field spanning no more than a maximum frequency span limit, Fmax, in a frequency dimension and spanning no more than a maximum mobility measurement session length limit, Tmax, in a time dimension, the method comprising:
- obtaining information representing a frequency diversity of a channel between the network node and the wireless communication device, a time diversity of the channel between the network node and the wireless communication device, and an antenna spatial diversity of the wireless communication device;
using the obtained information to evaluate each candidate MRS pattern in a set of candidate MRS patterns to ascertain, for each respective candidate MRS pattern in the set of candidate MRS patterns, a respective number of independently faded MRS, a frequency span in the frequency dimension, and a time length in the time dimension, wherein each respective candidate MRS pattern is a unique combination of a number, Nf, of subcarriers separated by a spacing Df in the frequency dimension and a number, Nt, of symbols, separated by a spacing Dt in the time dimension;
selecting one of the candidate MRS patterns out of the set of candidate MRS patterns that satisfies;
a total number of independently faded MRS in the candidate MRS pattern is greater than or equal to the predetermined number of independently faded MRS;
a frequency span of the candidate MRS pattern is less than or equal to the maximum frequency span limit, Fmax, in the frequency dimension; and
a session length of the candidate MRS pattern is less than or equal to the maximum mobility measurement session length limit, Tmax, in the time dimension;
signalling the selected MRS pattern to the wireless communication device; and
transmitting the MRS according to the selected MRS pattern.
1 Assignment
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Accused Products
Abstract
There is provided a method and a network node for allocating and transmitting Mobility Reference Signals, MRS, for a communication device to measure beam signal quality in a wireless communication network. The network node obtains information on one or more of a frequency diversity, a time diversity of a channel between the network node and the communication device, an antenna spatial diversity of the communication device. The network node selects an MRS pattern out of a set of candidate patterns based on the received information, signals the selected MRS pattern to the communication device and transmits the MRS according to the selected MRS pattern.
6 Citations
22 Claims
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1. A method performed in a network node for allocating and transmitting at least a predetermined number of independently faded Mobility Reference Signals (MRS) for a wireless communication device to measure beam signal quality in a wireless communication network, wherein the independently faded MRS are transmitted in a MRS field spanning no more than a maximum frequency span limit, Fmax, in a frequency dimension and spanning no more than a maximum mobility measurement session length limit, Tmax, in a time dimension, the method comprising:
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obtaining information representing a frequency diversity of a channel between the network node and the wireless communication device, a time diversity of the channel between the network node and the wireless communication device, and an antenna spatial diversity of the wireless communication device; using the obtained information to evaluate each candidate MRS pattern in a set of candidate MRS patterns to ascertain, for each respective candidate MRS pattern in the set of candidate MRS patterns, a respective number of independently faded MRS, a frequency span in the frequency dimension, and a time length in the time dimension, wherein each respective candidate MRS pattern is a unique combination of a number, Nf, of subcarriers separated by a spacing Df in the frequency dimension and a number, Nt, of symbols, separated by a spacing Dt in the time dimension; selecting one of the candidate MRS patterns out of the set of candidate MRS patterns that satisfies; a total number of independently faded MRS in the candidate MRS pattern is greater than or equal to the predetermined number of independently faded MRS; a frequency span of the candidate MRS pattern is less than or equal to the maximum frequency span limit, Fmax, in the frequency dimension; and a session length of the candidate MRS pattern is less than or equal to the maximum mobility measurement session length limit, Tmax, in the time dimension; signalling the selected MRS pattern to the wireless communication device; and transmitting the MRS according to the selected MRS pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20)
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10. A network node for allocating and transmitting at least a predetermined number of independently faded Mobility Reference Signals (MRS) for a wireless communication device to measure beam signal quality in a wireless communication network, wherein the independently faded MRS are transmitted in a MRS field spanning no more than a maximum frequency span limit, Fmax, in a frequency dimension and spanning no more than a maximum mobility measurement session length limit, Tmax, in a time dimension, wherein the network node is configured to:
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obtain information representing a frequency diversity of a channel between the network node and the wireless communication device, a time diversity of the channel between the network node and the wireless communication device, and an antenna spatial diversity of the wireless communication device; use the obtained information to evaluate each candidate MRS pattern in a set of candidate MRS patterns to ascertain, for each respective candidate MRS pattern in the set of candidate MRS patterns, a respective number of independently faded MRS, a frequency span in the frequency dimension, and a time length in the time dimension, wherein each respective candidate MRS pattern is a unique combination of a number, Nf, of subcarriers separated by a spacing Df in the frequency dimension and a number, Nt, of symbols, separated by a spacing Dt in the time dimension; select one of the candidate MRS patterns out of the set of candidate MRS patterns that satisfies; a total number of independently faded MRS in the candidate MRS pattern is greater than or equal to the predetermined number of independently faded MRS; a frequency span of the candidate MRS pattern is less than or equal to the maximum frequency span limit, Fmax, in the frequency dimension; and a session length of the candidate MRS pattern is less than or equal to the maximum mobility measurement session length limit, Tmax, in the time dimension; signal the selected MRS pattern to the wireless communication device; and transmit the MRS according to the selected MRS pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 21)
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19. A nontransitory computer readable storage medium comprising instructions which, when executed on at least one processor in a network node, cause the network node to carryout a method in a network node for allocating and transmitting at least a predetermined number of independently faded Mobility Reference Signals (MRS) for a wireless communication device to measure beam signal quality in a wireless communication network, wherein the independently faded MRS are transmitted in a MRS field spanning no more than a maximum frequency span limit, Fmax, in a frequency dimension and spanning no more than a maximum mobility measurement session length limit, Tmax, in a time dimension, the method comprising:
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obtaining information representing a frequency diversity of a channel between the network node and the wireless communication device, a time diversity of the channel between the network node and the wireless communication device, and an antenna spatial diversity of the wireless communication device; using the obtained information to evaluate each candidate MRS pattern in a set of candidate MRS patterns to ascertain, for each respective candidate MRS pattern in the set of candidate MRS patterns, a respective number of independently faded MRS, a frequency span in the frequency dimension, and a time length in the time dimension, wherein each respective candidate MRS pattern is a unique combination of a number, Nf, of subcarriers separated by a spacing Df in the frequency dimension and a number, Nt, of symbols, separated by a spacing Dt in the time dimension; selecting one of the candidate MRS patterns out of the set of candidate MRS patterns that satisfies; a total number of independently faded MRS in the candidate MRS pattern is greater than or equal to the predetermined number of independently faded MRS; a frequency span of the candidate MRS pattern is less than or equal to the maximum frequency span limit, Fmax, in the frequency dimension; and a session length of the candidate MRS pattern is less than or equal to the maximum mobility measurement session length limit, Tmax, in the time dimension; signalling the selected MRS pattern to the wireless communication device; and transmitting the MRS according to the selected MRS pattern. - View Dependent Claims (22)
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Specification