Resource Allocation Signaling in Mobile Telecommunications
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Solution Overview
Problem
The existing methods for signaling resource allocation in mobile telecommunications networks, such as the bitmap method, result in high overhead due to the limited number of bits available in the control channel, necessitating a more efficient approach to reduce signaling load.
Innovation Solution
The proposed method involves signaling resource allocation information in both the control and data channels, where resource allocation information for one user device is provided in the control channel, and information for additional allocations is conveyed in the data channel, using a list of RFI fields or bit maps, with indicators to specify the number and format of additional allocations, and prioritizing allocations based on channel quality to optimize decoding and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a bitmap method is used to signal resource allocation to each UE in the E-UTRA downlink, then complete resource allocation information can be provided, but the bit overhead becomes high requiring one bit per physical resource block (50 bits for 10 MHz bandwidth)
Solution Approach 1:
The patent segments resource allocation information into two parts: first resource allocation information signaled in the control channel (PDCCH) and second resource allocation information signaled in the data channel (PDSCH). This segmentation allows the control channel to carry only essential allocation data while the data channel carries additional allocation details, reducing control channel overhead from 50 bits to approximately 10-15 bits while maintaining complete resource allocation information.
Solution Approach 2:
The patent moves part of the resource allocation information from the control channel dimension to the data channel dimension. By signaling first resource allocation information in the control channel and second resource allocation information in the data channel, the system utilizes both control and data channel dimensions to convey complete resource allocation information with reduced control channel overhead.
2Productivity
If resource allocation information is signaled only in the control channel, then decoding can be performed with minimal buffering, but the control channel becomes overloaded and cannot support multiple user allocations efficiently
Solution Approach 1:
The patent segments resource allocation information across two channels: control channel carries first resource allocation information for initial decoding, and data channel carries second resource allocation information for additional allocations. This segmentation enables the control channel to support multiple user allocations efficiently by carrying condensed allocation data (10-15 bits) while the data channel provides supplementary allocation details.
Solution Approach 2:
The patent makes the data channel serve a dual function: carrying user data and carrying second resource allocation information. This multi-functionality allows the system to increase the number of supported user allocations without further expanding control channel capacity, as the data channel absorbs additional allocation signaling responsibilities.
3Quantity of substance
If resource allocation information is placed in resource blocks with poorer channel quality, then more resource blocks are available for allocation, but the probability of correct demodulation decreases
Solution Approach 1:
The patent applies local quality by placing first resource allocation information (critical for decoding) in resource blocks with better channel quality to ensure high demodulation accuracy, while second resource allocation information can be placed in remaining resource blocks. This localized quality differentiation ensures reliable decoding while maximizing resource block utilization.
Data Source
AI summary
A method of communicating control information, performed by a communication device in a mobile telecommunication system in which each of a plurality of communication devices are allocated plural orthogonal frequency-division multiplexing (OFDM) resource allocation, includes receiving, in a control channel, from a base station and over an E-UTRA air interface, control information identifying a resource allocation including frequencies of a shared data channel, and receiving, in the identified resource allocation including frequencies of the shared data channel, from a base station and over an E-UTRA air interface, control information identifying a further resource allocation including frequencies to be used for the transmission of data in the shared data channel.