UE-Specific Reference Symbols for Flexible Wireless Control Transmission
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Solution Overview
Problem
Current LTE systems lack effective methods to transmit common control signals using UE-specific reference symbols, leading to inefficiencies in power usage and interference, and fail to achieve diversity for small control channel messages, as well as accommodating varying bandwidths for different UEs.
Innovation Solution
The method involves allocating data portions to non-overlapping regions within resource blocks, each associated with unique reference symbols, allowing user equipment to demodulate and decode data using these symbols for channel estimation and data processing, enabling efficient transmission and reception of control messages across different bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common reference symbols are transmitted in all resource blocks regardless of data transmission, then all UEs can perform channel estimation, but power efficiency deteriorates and interference increases
Solution Approach 1:
The patent applies local quality by making reference symbol transmission selective rather than universal. UE-specific reference symbols are transmitted only in resource blocks where data is actually being transmitted to specific UEs, rather than broadcasting common reference symbols in all resource blocks. This localized approach maintains channel estimation capability where needed while eliminating unnecessary transmissions elsewhere, thereby improving power efficiency and reducing interference.
2Use of energy by moving object
If UE-specific reference symbols are transmitted only when data is transmitted, then power efficiency improves, but common control signal transmission capability deteriorates
Solution Approach 1:
The patent applies universality by enabling UE-specific reference symbols to serve multiple functions. These reference symbols are not only used for channel estimation of data transmissions but also for demodulating control signals such as PDCCH and PHICH. By making the reference symbols multi-functional, the system can transmit both data and control signals efficiently using the same reference symbol structure, thereby maintaining control signal capability while improving power efficiency.
3Area of stationary object
If reference symbols are transmitted for all UEs in a cell, then wide cell area coverage is achieved, but interference increases and power efficiency deteriorates
Solution Approach 1:
The patent applies local quality by making reference symbol transmission spatially selective. Instead of transmitting reference symbols that cover the entire cell area for all UEs, the system transmits UE-specific reference symbols only in the local resource blocks where specific UEs are scheduled to receive data. This localized transmission maintains coverage for served UEs while eliminating unnecessary transmissions in other areas, thereby reducing interference and improving power efficiency.
4Device complexity
If fixed resource block allocation is used, then system simplicity is maintained, but adaptability to varying UE bandwidth requirements deteriorates
Solution Approach 1:
The patent applies dynamics by making resource block allocation flexible and adaptive. The system dynamically allocates resource blocks to UEs based on their instantaneous bandwidth requirements and channel conditions. UE-specific reference symbols are transmitted only in the resource blocks that are currently allocated to each UE, allowing the system to adapt to varying bandwidth demands while maintaining a relatively simple reference symbol structure. This dynamic allocation enables efficient support for both narrowband and wideband UEs without requiring complex reference symbol patterns.
Data Source
AI summary
Devices and methods for transmitting information in resource blocks between a base station and one or more communication devices are disclosed. In each resource block (RB) used for a data or control channel transmission, a plurality of non-overlapping regions of resource elements (REs) are defined. Each region is associated with one or multiple unique reference symbols (RSs). When user equipment (UE) demodulates the information it receives in a particular region of a resource block (RB), it uses the reference symbol (RS) associated with that region. The reference symbol (RS) information may be used, for example, to estimate a channel of the communication network or to demodulate and decode the data contained within the associated regions.