HARQ Buffer Capability Negotiation in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In current IEEE 802.16d/e communication systems, the lack of consideration for mobile station (MS) buffer capability during hybrid automatic repeat request (HARQ) operations leads to unnecessary retransmissions, causing traffic delays and degrading system performance due to improper allocation of resources.
Innovation Solution
A system and method for transmitting and receiving HARQ buffer capability information between mobile stations and base stations, allowing for the negotiation and allocation of transmission signals based on the MS's buffer capacity, using specific bit configurations in messages like the subscriber station's basic capability negotiation request (SBC-REQ) to represent buffer capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ operations are performed without considering MS buffer capability, then system simplicity is maintained, but unnecessary retransmissions occur causing traffic delays and performance degradation
Solution Approach 1:
The patent applies preliminary action by negotiating and determining the MS buffer capability before HARQ operations commence. The base station and MS exchange capability information during initial connection or handover, allowing the base station to pre-configure appropriate transmission parameters that match the MS buffer capacity, thereby preventing unnecessary retransmissions from the outset
Solution Approach 2:
The patent implements feedback mechanisms where the MS reports its buffer capability information to the base station through uplink messages (such as SBC-REQ or RRC messages). This feedback enables the base station to adapt its downlink transmission strategy to the actual buffer capacity of the MS, optimizing resource allocation and avoiding transmissions that would cause buffer overflow or unnecessary retransmissions
2Loss of time
If transmission signals are allocated without regard to MS buffer capacity, then resource allocation simplicity is maintained, but traffic delays increase due to unnecessary retransmissions
Solution Approach 1:
The patent determines MS buffer capability in advance through capability negotiation messages exchanged between MS and base station before data transmission begins. This preliminary determination allows the base station to allocate transmission resources appropriately matched to the MS buffer capacity, preventing retransmissions and associated delays
Solution Approach 2:
The patent changes the transmission parameters (such as transport block size, modulation scheme, coding rate) based on the determined MS buffer capability. By adapting these parameters to match the buffer capacity, the system optimizes throughput while avoiding buffer overflow conditions that would trigger retransmissions and increase delay
3Adaptability or versatility
If HARQ buffer capability information is transmitted using existing message formats, then message structure simplicity is maintained, but information representation flexibility is limited
Solution Approach 1:
The patent segments the buffer capability information into distinct fields within existing message formats. Capability information is divided into separate elements such as buffer size indicators, support for different HARQ types, and other relevant parameters, allowing structured transmission and interpretation while maintaining compatibility with existing message frameworks
Solution Approach 2:
The patent achieves universality by incorporating buffer capability information into existing standardized message formats that are already used for other purposes (such as SBC-REQ, RRC messages). This multi-functional approach allows the same message structures to serve both their original functions and the additional function of conveying buffer capability information, avoiding the need for entirely new message types
Data Source
AI summary
Disclosed is a system and method for transmitting and receiving hybrid automatic repeat request (HARQ) buffer capability information in a broadband wireless access communication system. According to the system and method, a mobile station detects its own HARQ buffer capacity, and transmits a message including information about the detected HARQ buffer capability to a base station. The base station receives the message and determines the amount of a transmission signal to be allocated to the mobile station based on the HARQ buffer capability, so that it is possible to operate a HARQ scheme in accordance with the HARQ buffer capability of the mobile station.