Remote Radio Head MAC-PHY Split for IEEE 802.11 Timing
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Solution Overview
Problem
Current technologies do not consider the function split of the Medium Access Control (MAC) and Physical (PHY) layers across two separate devices, leading to communication delays that violate the timing requirements of IEEE 802.11 protocols, particularly in scenarios involving multiple devices with MAC layer functionalities, which are not effectively addressed by existing technologies.
Innovation Solution
The implementation of a Central Unit (CU) and Remote Radio Head (RRH) system, which consists of a Central Unit (CU) and at least one RRH, where the MAC and PHY layers are split between the CU and RRH, enabling efficient frame transmission and reception through the channel using Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) and Distributed Coordination Function (DCF) mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MAC and PHY layers are split across separate devices (CU and RRH), then device functionality and flexibility are improved, but communication delays and timing compliance deteriorate
Solution Approach 1:
The system segments the wireless communication functions by separating the MAC layer (CU) from the PHY layer (RRH), allowing independent optimization of each component while maintaining overall system functionality through defined interfaces
Solution Approach 2:
The patent applies preliminary action by having the RRH perform frame encapsulation into PPDUs before transmission, and by using reservation PPDUs to secure channel access in advance, thereby reducing actual transmission delays and ensuring timing compliance
2Adaptability or versatility
If the MAC and PHY layers are split across separate devices, then functional flexibility is improved, but protocol timing requirement compliance deteriorates
Solution Approach 1:
The system changes timing parameters by extending SIFS to eSIFS and introducing PE duration adjustments, allowing the protocol to accommodate the additional processing time required for inter-device communication while maintaining compatibility with IEEE 802.11 timing requirements
Solution Approach 2:
The RRH acts as an intermediary device between the CU and the wireless channel, performing frame encapsulation, transmission, and reception functions that bridge the gap between the MAC layer decisions and physical layer operations across separate devices
3Ease of manufacture
If frame encapsulation and transmission are performed at separate devices, then system modularity is improved, but processing time increases
Solution Approach 1:
The system segments processing functions by performing frame encapsulation at the RRH rather than at the CU, allowing modular deployment where the RRH can operate semi-independently to reduce processing time in the critical transmission path
Solution Approach 2:
The RRH performs frame encapsulation into PPDUs as a preliminary action before actual data transmission, and uses reservation PPDUs to secure channel access in advance, thereby reducing actual transmission delays despite the modular architecture
Data Source
AI summary
An enhanced protocol for addressing communication issues arising from using a Remote Radio Head (RRH). An Access Point (AP), denoted as Remote Radio Head (RRH) AP, consists of a Central Unit (CU) and at least one RRH that can be located remotely. The functionalities of the Medium Access Control (MAC) and the Physical (PHY) layers of the RRH AP are split between the CU and RRH; with the CU exchanging frames between the MAC layers, and the RRH transmitting and receiving the physical signals through the channel.