SRS Cyclic Shift and Comb Offset Hopping Coordination
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Solution Overview
Problem
Existing communication methods fail to maximize interference randomization between sounding reference signals (SRSs) due to cyclic shift hopping (CSH) and comb offset hopping (COH) incompatibilities among terminal devices, leading to comb offset conflicts and reduced channel estimation accuracy.
Innovation Solution
A communication method that uses indication information to determine target cyclic shift (CS) values and comb offset values for SRS transmission, allowing devices to utilize both CSH and COH simultaneously, thereby avoiding conflicts and maximizing interference randomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic shift hopping (CSH) and comb offset hopping (COH) are used to maximize interference randomization, then interference randomization between SRSs is improved, but device compatibility deteriorates because some terminal devices do not support these features
Solution Approach 1:
The network device pre-configures multiple combinations of cyclic shift values and comb offset values, and indicates to terminal devices which combinations to use. This preliminary configuration allows terminal devices to adopt interference randomization techniques in advance if they support them, while non-supporting devices can use default configurations, thus resolving the compatibility issue before interference occurs.
Solution Approach 2:
Different terminal devices are assigned different local qualities based on their capabilities. Supporting devices receive configurations that enable CSH and COH for maximum interference randomization, while non-supporting devices receive configurations that maintain compatibility without these features. This localized differentiation resolves the contradiction between maximizing interference randomization and maintaining device compatibility.
2Reliability
If comb offset hopping is used by all terminal devices, then interference randomization is maximized, but comb offset conflicts occur when some devices do not support the feature
Solution Approach 1:
The network device performs preliminary configuration by indicating specific combinations of cyclic shift values and comb offset values to terminal devices before SRS transmission. This advance configuration ensures that devices supporting COH use hopping while non-supporting devices use static configurations, preventing comb offset conflicts before they occur.
Solution Approach 2:
The network device acts as an intermediary that coordinates the use of comb offset hopping between different terminal devices. By controlling and distributing specific combinations of cyclic shift and comb offset values, the network device mediates potential conflicts, allowing supporting devices to benefit from COH while protecting non-supporting devices from conflicts.
3Reliability
If cyclic shift hopping is used by all terminal devices, then interference randomization is maximized, but compatibility issues arise with terminal devices that do not support the feature
Solution Approach 1:
The network device pre-configures and indicates specific combinations of cyclic shift values and comb offset values to terminal devices before SRS transmission. This preliminary action allows supporting devices to utilize CSH for interference randomization while non-supporting devices can use the indicated configurations without hopping, thus maintaining compatibility while maximizing interference randomization where possible.
Solution Approach 2:
The configuration mechanism is designed to be universal, working for both CSH-supporting and non-supporting terminal devices. The network device's indication of cyclic shift and comb offset combinations serves dual purposes: enabling interference randomization for supporting devices while providing compatible static configurations for non-supporting devices, thus achieving multi-functionality.
Data Source
AI summary
This application discloses a communication method and apparatus. The method includes: A terminal device receives indication information, where the indication information indicates M combinations, and each combination includes one CS value and one comb offset value; or each combination includes a hopping value of one CS value and a hopping value of one comb offset value, where M is a positive integer. Then, the terminal device determines, based on the indication information, a first pseudo-random sequence, and a first time unit, a target CS value and a target comb offset value that correspond to a reference signal in the first time unit. Then, the terminal device sends the reference signal in the first time unit based on the target CS value and the target comb offset value.