CS-1 RLC/MAC Control Message Detection in EGPRS
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Solution Overview
Problem
Current methods for transmitting RLC/MAC control messages to EGPRS mobile stations require double decoding and bit puncturing, leading to increased decoding complexity and degraded link performance.
Innovation Solution
Transmitting the RLC/MAC control message in an MCS-1 radio block with a CS-1 RLC/MAC control block header and content, using the CPS field to signal the presence of a CS-1 block, and employing a CS-4 stealing bit code word to indicate the CS-1 block, without requiring double decoding or bit puncturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If double decoding is used to detect CS-1 RLC/MAC control messages, then detection accuracy is improved, but decoding complexity increases
Solution Approach 1:
The patent extracts the RLC/MAC control message from the RLC data block and places it in the RLC header. This allows the control message to be detected and processed separately from the main data decoding process, eliminating the need for double decoding while maintaining detection accuracy. The control message is taken out of the data stream and positioned where it can be efficiently identified through standard header parsing.
Solution Approach 2:
The patent performs preliminary encoding of the RLC/MAC control message within the RLC header structure before transmission. By pre-positioning the control message in the header with appropriate signaling indicators, the receiving device can identify and process control messages during the initial decoding phase without requiring a second decoding pass, thus reducing overall decoding complexity.
2Adaptability or versatility
If bit puncturing is used to transmit control messages, then transmission flexibility is improved, but link performance deteriorates
Solution Approach 1:
The patent segments the RLC protocol structure into distinct header and data portions, with the control message placed in the header. This segmentation allows the control message to be transmitted without puncturing the data portion, maintaining the integrity and error protection of the data bits while still providing the flexibility to include or exclude control messages as needed.
Solution Approach 2:
The patent uses the RLC header as an intermediary structure to carry control messages. Instead of directly puncturing data bits to embed control information, the control message is placed in the header which serves as a mediator between the control plane and data plane. This approach maintains the separation between control and data transmission, preserving link performance while achieving transmission flexibility.
3Adaptability or versatility
If CS-4 stealing bit code word is used to indicate MCS-1 to MCS-4 blocks, then legacy GPRS MS compatibility is improved, but EGPRS MS decoding complexity increases
Solution Approach 1:
The patent copies the legacy GPRS RLC header structure and control message format into the EGPRS framework. By maintaining the same stealing bit code words and header structure that legacy GPRS mobile stations expect, EGPRS devices can process these messages using their existing legacy compatibility logic without requiring additional complex decoding procedures. The control message format is copied from the legacy standard to ensure seamless interoperability.
Data Source
AI summary
A method of transmitting a downlink, coding scheme CS-1 RLC/MAC control message from a BSS to an EGPRS MS (61), and receiving and detecting the CS-1 RLC/MAC control message in the MS. The BSS places in an MCS-1 radio block, a CS-1 RLC/MAC control block identical to a coding scheme CS-1 RLC/MAC control message excluding the MAC header octet. The BSS also places a coding scheme CS-4 stealing bit code word in the radio block using legacy stealing bit values and positions. The CPS field (26) of the block header (25) indicates that the radio block contains a CS-1 RLC/MAC control message. The MS receives the radio block and detects the coding scheme CS-4 stealing bit code word. In response, the MS interprets the received radio block header to identify the CPS field. The MS determines from the CPS field that a CS-1 RLC/MAC control block has been received.