Rate Matching Around DRS in Wireless Communications
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in performing rate matching for channels around reference signals, especially when the configuration of discovery reference signals (DRS) is not explicit about whether non-zero-power and zero-power CSI-RSs are transmitted over the entire system bandwidth or a measurement bandwidth, leading to undesirable results.
Innovation Solution
A method and apparatus for determining the bandwidth for rate matching around DRS, which involves receiving a configuration identifying resources for non-zero power and zero power reference signals over different bandwidths, and performing rate matching for channels based on the second resources over the second bandwidth, allowing the user equipment to accurately match channels around the reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rate matching is performed around reference signals without explicit bandwidth configuration, then the system can support heterogeneous network deployments with small cells, but the UE cannot accurately determine whether to rate match over the entire system bandwidth or only over the measurement bandwidth, leading to rate matching errors and communication failures
Solution Approach 1:
The patent applies preliminary action by having the eNB pre-configure the UE with bandwidth information for rate matching around DRS before the UE performs rate matching operations. The configuration includes parameters such as subframe offsets, frequency offsets, and bandwidth values that the UE uses to accurately determine the measurement bandwidth for rate matching, eliminating the ambiguity about whether to rate match over the entire system bandwidth or only over the measurement bandwidth.
Solution Approach 2:
The patent uses configuration parameters as intermediaries to bridge the gap between the eNB's DRS transmission and the UE's rate matching operations. The eNB provides configuration information including bandwidth parameters that act as intermediaries, enabling the UE to correctly interpret the measurement bandwidth and perform accurate rate matching without directly observing the eNB's internal bandwidth decisions.
2Quantity of substance
If the eNB transmits DRS over the entire system bandwidth, then maximum measurement bandwidth is utilized for small cell discovery, but the UE may incorrectly assume a smaller measurement bandwidth and perform rate matching only over a portion of the available resources, reducing spectral efficiency
Solution Approach 1:
The patent applies feedback by having the eNB explicitly provide bandwidth configuration information to the UE through higher layer signaling. This feedback mechanism ensures that the UE receives accurate information about the measurement bandwidth and can correctly perform rate matching over the appropriate resources, preventing the UE from incorrectly assuming a smaller bandwidth and thereby maintaining spectral efficiency.
Solution Approach 2:
The patent uses parameter changes by introducing configurable bandwidth parameters that the eNB can set based on its transmission strategy. These parameters include the measurement bandwidth size and the rate matching bandwidth, which can be independently configured to match the actual DRS transmission bandwidth, allowing the system to adapt between transmitting over the entire system bandwidth or over a smaller measurement bandwidth.
3Productivity
If the UE performs rate matching over the entire system bandwidth without explicit configuration, then all available resources are utilized for data transmission, but the UE may include resources actually used by DRS in the rate matching process, causing interference and communication failures
Solution Approach 1:
The patent applies preliminary action by configuring the UE with DRS resource information before the UE performs rate matching. The configuration includes subframe offsets, frequency offsets, and bandwidth parameters that enable the UE to identify and exclude DRS resources from the rate matching process, ensuring that data transmission does not interfere with DRS reception while still utilizing all available non-DRS resources.
Solution Approach 2:
The patent applies the taking out principle by having the UE extract and exclude DRS resources from the set of resources available for rate matching. The configuration parameters enable the UE to identify the specific time-frequency resources used by DRS and remove them from the rate matching calculation, preventing interference while maximizing the utilization of remaining resources for data transmission.
Data Source
AI summary
Various aspects described herein relate to rate matching around reference signaling. A discovery reference signal (DRS) configuration is received that identifies first resources related to non-zero power reference signals for DRS transmitted by a cell over a first bandwidth and second resources related to zero power reference signals for the DRS over a second bandwidth. The first bandwidth can be less than or equal to the second bandwidth. At least one channel can be received from the cell along with an instance of the non-zero power reference signals and the zero power reference signals. Rate matching can be performed for the at least one channel around the second resources over the second bandwidth.