Dynamic Uplink Sounding Region Allocation for TDD Wireless Networks
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Solution Overview
Problem
In wireless communications networks employing TDD, the overhead of transmitting training symbols for channel quality information (CQI) is high, leading to inefficient utilization of radio resources due to the need for periodic allocation of sounding regions, which may not always be necessary.
Innovation Solution
A method for dynamically allocating an uplink sounding region based on retrieving identification information from databases, such as a scheduling or channel database, to obtain downlink CQI only when necessary, allowing the reuse of existing CQI if conditions haven't changed, thereby minimizing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sounding region is allocated periodically to obtain downlink CQI, then the reliability of CQI information is improved, but the overhead of transmitting training symbols increases and radio resource utilization decreases
Solution Approach 1:
The patent applies dynamic allocation of sounding regions based on actual channel conditions and service requirements. Instead of fixed periodic allocation, the system dynamically determines whether to allocate sounding regions by checking databases for existing CQI information and uplink burst schedules. This dynamic approach adjusts the allocation frequency according to actual needs, resolving the contradiction between maintaining reliable CQI information and reducing unnecessary overhead.
2Productivity
If a sounding region is allocated on demand to reduce overhead, then the radio resource utilization is improved, but the timeliness of CQI availability may be compromised
Solution Approach 1:
The patent implements preliminary checks in databases before allocating sounding regions. The system pre-stores CQI information and uplink burst scheduling information in databases, allowing the base station to quickly determine whether CQI is already available or can be obtained from upcoming uplink bursts. This preliminary action prevents unnecessary sounding region allocation while ensuring CQI timeliness, as the system can proactively identify when CQI is needed and when it can be reused.
3Measurement precision
If training symbols are transmitted frequently to ensure CQI accuracy, then the measurement precision of channel quality is improved, but the bandwidth and power consumption increase
Solution Approach 1:
The patent enables the system to serve itself by utilizing existing uplink training symbols from scheduled uplink bursts to obtain CQI information. Instead of independently allocating dedicated sounding regions, the base station leverages the uplink training symbols that mobile stations must transmit anyway for other purposes. This self-service approach maintains measurement precision by using actual uplink training symbols while avoiding additional bandwidth consumption from separate sounding allocations.
Data Source
AI summary
The present invention discloses a method for allocating an uplink sounding region dynamically to obtain downlink channel quality information (CQI) about a downlink channel. The method comprises receiving a downlink transmission request and retrieving an identification information from the downlink transmission request, searching one or more databases using the retrieved identification information as a key, identifying the CQI about the downlink channel from the one or more databases, wherein the uplink sounding region needs not to be allocated when the CQI corresponding to the downlink transmission request is identified in the databases.