SRS Cyclic Shift and Comb Offset Hopping for Interference Randomization
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Solution Overview
Problem
Sounding reference signals (SRSs) sent by different terminal devices interfere with each other, and existing methods like cyclic shift hopping (CSH) and comb offset hopping (COH) are not effective for all devices, leading to interference randomization issues and comb offset conflicts.
Innovation Solution
A communication method that uses indication information to determine a first pseudo-random sequence, allowing terminal devices to select a target cyclic shift (CS) value and comb offset value from specified combinations, ensuring compatibility and maximizing interference randomization among devices.
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 is improved, but compatibility with terminal devices that do not support COH or CSH deteriorates
Solution Approach 1:
The patent makes the CSH and COH mechanisms universally applicable to all terminal devices by introducing a capability indication field. The network device adapts its scheduling strategy based on terminal capability feedback, enabling advanced interference randomization for capable devices while maintaining basic compatibility for legacy devices. This resolves the contradiction by making the system universally applicable to both device types.
Solution Approach 2:
The patent changes the parameter of terminal device capability indication by introducing a new field in the terminal capability information. This parameter change enables the network device to differentiate between device types and apply appropriate scheduling strategies, thereby achieving both improved interference randomization for capable devices and maintained compatibility for legacy devices.
2Device complexity
If a terminal device occupies a specific comb offset, then resource allocation is simplified, but interference randomization deteriorates due to comb offset conflicts
Solution Approach 1:
The patent introduces dynamic comb offset allocation through COH, where the comb offset is no longer fixed but changes over time based on a hopping pattern. This dynamic approach allows terminal devices to hop between different comb offsets across different time units, effectively randomizing interference while the network device maintains simplified resource allocation through pre-configured hopping patterns.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the comb offset hopping patterns and cyclic shift hopping patterns before actual resource allocation. The network device prepares the hopping sequences and patterns in advance, so that when resource allocation occurs, both the network device and terminal devices can efficiently execute the pre-planned interference randomization without complex real-time calculations.
3Reliability
If comb offset hopping (COH) and cyclic shift hopping (CSH) are used together, then interference randomization is maximized, but device complexity increases
Solution Approach 1:
The patent segments the interference randomization function into two independent but complementary mechanisms: COH for comb offset hopping and CSH for cyclic shift hopping. Each mechanism operates independently with its own hopping pattern and parameters, allowing the system to achieve maximized interference randomization through their combined effect while keeping each individual mechanism relatively simple and manageable.
Data Source
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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. According to the method, the terminal device uses one combination of a comb offset value and a CS value in the M combinations, so that a conflict between CS values or comb offset values used by different terminal devices can be avoided, to maximize randomization of interference between reference signals of any two terminal devices in a cell.