LTE Control Channel Resource Multiplexing via Extension Sequences
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Solution Overview
Problem
In LTE/LTE-A systems, the number of transmitting terminals supported by a Physical Resource Block (PRB) is limited due to the distinction of PUCCH formats, leading to low resource utilization, especially when multiple antennas are used, as each antenna array requires separate time-frequency resources.
Innovation Solution
The method involves obtaining second and third data symbol sequences from a first data symbol sequence and using the same extension sequence to process them, mapping them onto the same time-frequency resources corresponding to different antenna arrays, ensuring that each antenna array can use the same extension sequence, thereby increasing the number of terminals that can be supported by a PRB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different PUCCH formats are used for different control signaling types, then control signaling transmission is enabled, but the number of transmitting terminals supported by one PRB is limited
Solution Approach 1:
The patent applies universality by enabling a single PUCCH format to serve multiple control signaling types (ACK/NACK, CQI, scheduling request) through the use of different extension sequences. Instead of requiring separate PUCCH formats for each control signaling type, the system allows one format to handle all types by varying the extension sequence applied to the data symbol sequence, thereby increasing the number of terminals that can be supported in one PRB.
Solution Approach 2:
The patent changes the parameter of extension sequence to differentiate control signaling types. By applying different extension sequences (different cyclic shifts or different base sequences) to the same PUCCH format, the system can distinguish between ACK/NACK, CQI, and scheduling request signals without requiring different formats, thus resolving the contradiction between format differentiation and terminal support capacity.
2Reliability
If multiple antenna arrays are used for transmitting terminals, then transmission diversity is improved, but each antenna array requires separate time-frequency resources
Solution Approach 1:
The patent merges multiple antenna arrays into the same time-frequency resources by allowing different antenna arrays to transmit using the same PUCCH format and same PRB. The distinction between antenna arrays is handled through different extension sequences rather than separate resource allocation, thereby combining resource usage while maintaining transmission diversity across multiple antennas.
Solution Approach 2:
The patent introduces a new dimension for resource differentiation - the extension sequence dimension. Instead of allocating separate time-frequency resources for each antenna array, the system differentiates antenna arrays by assigning different extension sequences (cyclic shifts) to each, effectively moving the differentiation from the time-frequency domain to the sequence domain.
3Quantity of substance
If one PRB accommodates multiple PUCCHs of the same format distinguished by different sequences, then more terminals can be supported, but the sequences must be orthogonal which limits the number of available sequences
Solution Approach 1:
The patent segments the extension sequence space into multiple orthogonal cyclic shifts that can be assigned to different antenna arrays and control signaling types. By dividing the available cyclic shifts among different terminals and antenna arrays, the system can support more terminals within the orthogonality constraint, as each terminal receives a unique cyclic shift assignment.
Data Source
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AI summary
The present invention provides a communication method for a control channel and an apparatus, where the control channel includes at least one timeslot, and the method includes: obtaining, according to a first data symbol sequence [q(0),q(1),L q(M-1)] to be transmitted in a timeslot and coefficients a(i) and d(i), a second data symbol sequence [a(0)q(0),a(1)q(1),L ,a(M-1)q(M-1)] and a third data symbol sequence [a(0)q(0),a(1)q(1),L ,a(M-1)q(M-1)], where, in a(i)+d(i), at least one pair of a(u)+d(u) and a(v)+d(v) have unequal moduli; and using the same extension sequence [w(0),w(1),L ,w(N-1)] to process the second data symbol sequence and the third data symbol sequence, mapping the processed data respectively onto the same time-frequency resources corresponding to a first antenna array and a second antenna array, and transmitting the data, where i, u, and v are integers, 0≤i≤M-1, and u≤v.