Random Access Group Scheduling Identity for PDCCH Resource Conservation
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Solution Overview
Problem
In LTE systems, a large number of PDCCH signalings are required when multiple UEs lose uplink synchronization, leading to significant overhead and limiting the number of users that can be scheduled.
Innovation Solution
A random access method where a shared random access group scheduling identity is used to include random access indication information in data packets, reducing the need for frequent PDCCH signalings and conserving PDCCH resources by instructing multiple UEs to perform random access through data packets on the PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH signaling is used to trigger random access for multiple UEs, then random access can be initiated, but PDCCH signaling overhead increases significantly
Solution Approach 1:
The patent combines multiple random access trigger indications into a single PDCCH signaling by grouping UEs and using a group identifier. Instead of sending separate PDCCH orders to each UE, the base station sends one consolidated signaling that triggers random access for multiple UEs simultaneously, thereby reducing PDCCH overhead while maintaining reliable random access initiation.
Solution Approach 2:
The patent introduces a group identifier that can be shared by multiple UEs, allowing a single PDCCH signaling to serve multiple functions - triggering random access for any UE within the group. This multi-functional approach reduces the need for dedicated PDCCH signalings for each individual UE.
2Reliability
If PDCCH signaling is used to trigger random access for multiple UEs, then random access can be initiated, but the number of schedulable users is limited
Solution Approach 1:
By merging multiple random access triggers into a single PDCCH signaling through UE grouping, the system frees up PDCCH resources that can then be allocated to schedule more data transmissions for additional users, thereby increasing the overall number of schedulable users in the system.
Solution Approach 2:
The patent segments UEs into groups based on shared characteristics or service requirements, allowing efficient group-based random access triggering. This segmentation enables the system to handle random access for multiple users within each group using minimal signaling overhead.
3Ease of operation
If individual PDCCH signalings are sent to each UE for random access, then precise control is achieved, but signaling complexity increases
Solution Approach 1:
The patent merges individual UE control into group-based control by assigning group identifiers to multiple UEs. The base station sends a single PDCCH signaling containing a group identifier, which all UEs in that group monitor. This approach maintains precise control over which UEs perform random access while significantly reducing signaling complexity compared to individual PDCCH orders.
Data Source
AI summary
The present invention provides a random access method, a user equipment and a network equipment. The method comprising: acquiring a random access group scheduling identity, wherein the random access group scheduling identity is shared by user equipments belonging to a first group; receiving control signaling scrambled by the random access group scheduling identity on a PDCCH, and decoding the control signaling according to the random access group scheduling identity; receiving a data packet on a PDSCH according to the decoded control signaling, wherein the data packet comprises indication information used for instructing at least one UE belonging to the first group to perform a random access; and determining that the random access is needed to be performed according to the indication information, and performing the random access. The embodiments of the present invention may save PDCCH resource.