PRACH Sequence Group Expansion for LTE CoMP Contention
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Solution Overview
Problem
The existing PRACH resource in LTE Release-8/9/10 systems is insufficient to support the increased number of UEs accessing macro base stations and RRHs in CoMP scenario 4, leading to fierce contention and reduced user experience.
Innovation Solution
The proposed method involves determining and sending an indication parameter for a PRACH sequence group that includes multiple types of PRACH sequences, allowing UEs to access either macro or pico base stations, thereby expanding the PRACH resource capacity and reducing contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the existing PRACH resource in LTE Release-8/9/10 system is used, then the system structure is simple, but the PRACH resource capacity is insufficient to support the increased number of UEs in CoMP scenario 4
Solution Approach 1:
The PRACH sequence group is segmented into multiple types (first PRACH sequences, second PRACH sequences, third PRACH sequences, fourth PRACH sequences, fifth PRACH sequences, and sixth PRACH sequences) with different parameters. This segmentation allows the system to support a larger number of UEs by providing diverse PRACH resources, thereby increasing PRACH resource capacity while managing the complexity through structured organization of sequence types.
2Area of stationary object
If multiple RRHs are introduced in CoMP solution 4 to expand coverage, then the coverage area increases, but the PRACH contention becomes fiercer due to limited PRACH resources
Solution Approach 1:
Different types of PRACH sequences are configured with different parameters to allow UEs to select appropriate sequences based on their access needs. This parameter differentiation increases the effective PRACH resource capacity, reducing contention fierceness while supporting expanded coverage area through multiple RRHs in CoMP scenario 4.
3Productivity
If the number of serving UEs increases largely due to multiple RRHs, then the system throughput is enhanced, but the existing PRACH resource becomes insufficient for random access
Solution Approach 1:
The patent introduces multiple dimensions of PRACH sequence differentiation (contention-based Group A and Group B, non-contention based, first through sixth sequence types) to expand the PRACH resource space. This multi-dimensional approach enables the system to support a larger number of serving UEs and enhance throughput while providing sufficient random access resources through diversified sequence configurations.
Data Source
AI summary
Embodiments of the present invention provide a method, a base station, and a user equipment for PRACH access. The method includes: determining a PRACH sequence group used by multiple base stations, where the multiple base stations use a same cell identity and include a macro base station and at least one pico base station, the PRACH sequence group includes k1 first PRACH sequences, k2 second PRACH sequences, k3 third PRACH sequences, k4 fourth PRACH sequences, k5 fifth PRACH sequences, and k6 sixth PRACH sequences, k1 and k4 are positive integers, and k2, k3, k5, and k6 are nonnegative integers; and sending an indication parameter of the PRACH sequence group to the UE for the UE to randomly access a network, where the indication parameter is used for indicating the first PRACH sequences to the sixth PRACH sequences. In the embodiments of the present invention, the PRACH sequence group used by multiple base stations includes the first PRACH sequences to the sixth PRACH sequences and is not limited to three types of PRACH sequences, thereby reducing the fierceness of contention access to a PRACH.